Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/jinja2/nodes.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 jinja2.nodes
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4 ~~~~~~~~~~~~
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5
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6 This module implements additional nodes derived from the ast base node.
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7
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8 It also provides some node tree helper functions like `in_lineno` and
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9 `get_nodes` used by the parser and translator in order to normalize
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10 python and jinja nodes.
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11
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12 :copyright: (c) 2010 by the Jinja Team.
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13 :license: BSD, see LICENSE for more details.
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14 """
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15 import types
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16 import operator
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17
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18 from collections import deque
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19 from jinja2.utils import Markup
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20 from jinja2._compat import izip, with_metaclass, text_type
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21
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22
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23 #: the types we support for context functions
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24 _context_function_types = (types.FunctionType, types.MethodType)
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25
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26
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27 _binop_to_func = {
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28 '*': operator.mul,
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29 '/': operator.truediv,
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30 '//': operator.floordiv,
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31 '**': operator.pow,
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32 '%': operator.mod,
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33 '+': operator.add,
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34 '-': operator.sub
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35 }
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36
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37 _uaop_to_func = {
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38 'not': operator.not_,
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39 '+': operator.pos,
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40 '-': operator.neg
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41 }
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42
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43 _cmpop_to_func = {
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44 'eq': operator.eq,
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45 'ne': operator.ne,
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46 'gt': operator.gt,
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47 'gteq': operator.ge,
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48 'lt': operator.lt,
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49 'lteq': operator.le,
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50 'in': lambda a, b: a in b,
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51 'notin': lambda a, b: a not in b
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52 }
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53
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54
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55 class Impossible(Exception):
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56 """Raised if the node could not perform a requested action."""
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57
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58
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59 class NodeType(type):
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60 """A metaclass for nodes that handles the field and attribute
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61 inheritance. fields and attributes from the parent class are
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62 automatically forwarded to the child."""
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63
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64 def __new__(cls, name, bases, d):
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65 for attr in 'fields', 'attributes':
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66 storage = []
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67 storage.extend(getattr(bases[0], attr, ()))
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68 storage.extend(d.get(attr, ()))
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69 assert len(bases) == 1, 'multiple inheritance not allowed'
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70 assert len(storage) == len(set(storage)), 'layout conflict'
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71 d[attr] = tuple(storage)
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72 d.setdefault('abstract', False)
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73 return type.__new__(cls, name, bases, d)
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74
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75
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76 class EvalContext(object):
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77 """Holds evaluation time information. Custom attributes can be attached
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78 to it in extensions.
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79 """
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80
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81 def __init__(self, environment, template_name=None):
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82 self.environment = environment
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83 if callable(environment.autoescape):
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84 self.autoescape = environment.autoescape(template_name)
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85 else:
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86 self.autoescape = environment.autoescape
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87 self.volatile = False
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88
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89 def save(self):
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90 return self.__dict__.copy()
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91
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92 def revert(self, old):
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93 self.__dict__.clear()
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94 self.__dict__.update(old)
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95
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96
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97 def get_eval_context(node, ctx):
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98 if ctx is None:
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99 if node.environment is None:
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100 raise RuntimeError('if no eval context is passed, the '
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101 'node must have an attached '
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102 'environment.')
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103 return EvalContext(node.environment)
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104 return ctx
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105
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106
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107 class Node(with_metaclass(NodeType, object)):
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108 """Baseclass for all Jinja2 nodes. There are a number of nodes available
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109 of different types. There are four major types:
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110
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111 - :class:`Stmt`: statements
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112 - :class:`Expr`: expressions
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113 - :class:`Helper`: helper nodes
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114 - :class:`Template`: the outermost wrapper node
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115
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116 All nodes have fields and attributes. Fields may be other nodes, lists,
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117 or arbitrary values. Fields are passed to the constructor as regular
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118 positional arguments, attributes as keyword arguments. Each node has
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119 two attributes: `lineno` (the line number of the node) and `environment`.
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120 The `environment` attribute is set at the end of the parsing process for
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121 all nodes automatically.
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122 """
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123 fields = ()
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124 attributes = ('lineno', 'environment')
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125 abstract = True
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126
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127 def __init__(self, *fields, **attributes):
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128 if self.abstract:
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129 raise TypeError('abstract nodes are not instanciable')
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130 if fields:
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131 if len(fields) != len(self.fields):
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132 if not self.fields:
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133 raise TypeError('%r takes 0 arguments' %
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134 self.__class__.__name__)
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135 raise TypeError('%r takes 0 or %d argument%s' % (
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136 self.__class__.__name__,
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137 len(self.fields),
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138 len(self.fields) != 1 and 's' or ''
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139 ))
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140 for name, arg in izip(self.fields, fields):
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141 setattr(self, name, arg)
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142 for attr in self.attributes:
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143 setattr(self, attr, attributes.pop(attr, None))
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144 if attributes:
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145 raise TypeError('unknown attribute %r' %
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146 next(iter(attributes)))
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147
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148 def iter_fields(self, exclude=None, only=None):
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149 """This method iterates over all fields that are defined and yields
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150 ``(key, value)`` tuples. Per default all fields are returned, but
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151 it's possible to limit that to some fields by providing the `only`
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152 parameter or to exclude some using the `exclude` parameter. Both
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153 should be sets or tuples of field names.
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154 """
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155 for name in self.fields:
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156 if (exclude is only is None) or \
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157 (exclude is not None and name not in exclude) or \
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158 (only is not None and name in only):
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159 try:
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160 yield name, getattr(self, name)
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161 except AttributeError:
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162 pass
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163
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164 def iter_child_nodes(self, exclude=None, only=None):
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165 """Iterates over all direct child nodes of the node. This iterates
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166 over all fields and yields the values of they are nodes. If the value
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167 of a field is a list all the nodes in that list are returned.
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168 """
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169 for field, item in self.iter_fields(exclude, only):
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170 if isinstance(item, list):
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171 for n in item:
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172 if isinstance(n, Node):
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173 yield n
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174 elif isinstance(item, Node):
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175 yield item
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176
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177 def find(self, node_type):
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178 """Find the first node of a given type. If no such node exists the
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179 return value is `None`.
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180 """
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181 for result in self.find_all(node_type):
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182 return result
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183
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184 def find_all(self, node_type):
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185 """Find all the nodes of a given type. If the type is a tuple,
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186 the check is performed for any of the tuple items.
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187 """
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188 for child in self.iter_child_nodes():
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189 if isinstance(child, node_type):
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190 yield child
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191 for result in child.find_all(node_type):
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192 yield result
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193
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194 def set_ctx(self, ctx):
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195 """Reset the context of a node and all child nodes. Per default the
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196 parser will all generate nodes that have a 'load' context as it's the
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197 most common one. This method is used in the parser to set assignment
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198 targets and other nodes to a store context.
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199 """
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200 todo = deque([self])
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201 while todo:
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202 node = todo.popleft()
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203 if 'ctx' in node.fields:
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204 node.ctx = ctx
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205 todo.extend(node.iter_child_nodes())
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206 return self
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207
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208 def set_lineno(self, lineno, override=False):
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209 """Set the line numbers of the node and children."""
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210 todo = deque([self])
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211 while todo:
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212 node = todo.popleft()
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213 if 'lineno' in node.attributes:
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214 if node.lineno is None or override:
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215 node.lineno = lineno
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216 todo.extend(node.iter_child_nodes())
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217 return self
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218
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219 def set_environment(self, environment):
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220 """Set the environment for all nodes."""
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221 todo = deque([self])
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222 while todo:
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223 node = todo.popleft()
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224 node.environment = environment
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225 todo.extend(node.iter_child_nodes())
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226 return self
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227
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228 def __eq__(self, other):
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229 return type(self) is type(other) and \
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230 tuple(self.iter_fields()) == tuple(other.iter_fields())
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231
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232 def __ne__(self, other):
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233 return not self.__eq__(other)
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234
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235 # Restore Python 2 hashing behavior on Python 3
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236 __hash__ = object.__hash__
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237
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238 def __repr__(self):
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239 return '%s(%s)' % (
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240 self.__class__.__name__,
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241 ', '.join('%s=%r' % (arg, getattr(self, arg, None)) for
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242 arg in self.fields)
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243 )
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244
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245
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246 class Stmt(Node):
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247 """Base node for all statements."""
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248 abstract = True
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249
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250
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251 class Helper(Node):
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252 """Nodes that exist in a specific context only."""
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253 abstract = True
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254
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255
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256 class Template(Node):
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257 """Node that represents a template. This must be the outermost node that
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258 is passed to the compiler.
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259 """
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260 fields = ('body',)
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261
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262
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263 class Output(Stmt):
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264 """A node that holds multiple expressions which are then printed out.
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265 This is used both for the `print` statement and the regular template data.
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266 """
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267 fields = ('nodes',)
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268
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269
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270 class Extends(Stmt):
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271 """Represents an extends statement."""
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272 fields = ('template',)
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273
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274
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275 class For(Stmt):
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276 """The for loop. `target` is the target for the iteration (usually a
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277 :class:`Name` or :class:`Tuple`), `iter` the iterable. `body` is a list
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278 of nodes that are used as loop-body, and `else_` a list of nodes for the
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279 `else` block. If no else node exists it has to be an empty list.
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280
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281 For filtered nodes an expression can be stored as `test`, otherwise `None`.
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282 """
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283 fields = ('target', 'iter', 'body', 'else_', 'test', 'recursive')
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284
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285
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286 class If(Stmt):
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287 """If `test` is true, `body` is rendered, else `else_`."""
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288 fields = ('test', 'body', 'else_')
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289
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290
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291 class Macro(Stmt):
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292 """A macro definition. `name` is the name of the macro, `args` a list of
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293 arguments and `defaults` a list of defaults if there are any. `body` is
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294 a list of nodes for the macro body.
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295 """
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296 fields = ('name', 'args', 'defaults', 'body')
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297
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298
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299 class CallBlock(Stmt):
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300 """Like a macro without a name but a call instead. `call` is called with
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301 the unnamed macro as `caller` argument this node holds.
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302 """
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303 fields = ('call', 'args', 'defaults', 'body')
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304
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305
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306 class FilterBlock(Stmt):
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307 """Node for filter sections."""
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308 fields = ('body', 'filter')
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309
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310
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311 class Block(Stmt):
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312 """A node that represents a block."""
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313 fields = ('name', 'body', 'scoped')
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314
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315
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316 class Include(Stmt):
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317 """A node that represents the include tag."""
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318 fields = ('template', 'with_context', 'ignore_missing')
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319
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320
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321 class Import(Stmt):
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322 """A node that represents the import tag."""
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323 fields = ('template', 'target', 'with_context')
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324
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325
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326 class FromImport(Stmt):
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327 """A node that represents the from import tag. It's important to not
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328 pass unsafe names to the name attribute. The compiler translates the
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329 attribute lookups directly into getattr calls and does *not* use the
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330 subscript callback of the interface. As exported variables may not
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331 start with double underscores (which the parser asserts) this is not a
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332 problem for regular Jinja code, but if this node is used in an extension
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333 extra care must be taken.
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334
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335 The list of names may contain tuples if aliases are wanted.
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336 """
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337 fields = ('template', 'names', 'with_context')
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338
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339
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340 class ExprStmt(Stmt):
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341 """A statement that evaluates an expression and discards the result."""
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342 fields = ('node',)
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343
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344
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345 class Assign(Stmt):
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346 """Assigns an expression to a target."""
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347 fields = ('target', 'node')
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348
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349
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350 class AssignBlock(Stmt):
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351 """Assigns a block to a target."""
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352 fields = ('target', 'body')
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353
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354
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355 class Expr(Node):
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356 """Baseclass for all expressions."""
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357 abstract = True
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358
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359 def as_const(self, eval_ctx=None):
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360 """Return the value of the expression as constant or raise
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361 :exc:`Impossible` if this was not possible.
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362
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363 An :class:`EvalContext` can be provided, if none is given
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364 a default context is created which requires the nodes to have
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365 an attached environment.
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366
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367 .. versionchanged:: 2.4
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368 the `eval_ctx` parameter was added.
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369 """
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370 raise Impossible()
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371
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372 def can_assign(self):
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373 """Check if it's possible to assign something to this node."""
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374 return False
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375
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376
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377 class BinExpr(Expr):
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378 """Baseclass for all binary expressions."""
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379 fields = ('left', 'right')
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380 operator = None
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381 abstract = True
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382
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383 def as_const(self, eval_ctx=None):
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384 eval_ctx = get_eval_context(self, eval_ctx)
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385 # intercepted operators cannot be folded at compile time
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386 if self.environment.sandboxed and \
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387 self.operator in self.environment.intercepted_binops:
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388 raise Impossible()
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389 f = _binop_to_func[self.operator]
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diff changeset
390 try:
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391 return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx))
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392 except Exception:
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393 raise Impossible()
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394
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395
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396 class UnaryExpr(Expr):
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397 """Baseclass for all unary expressions."""
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398 fields = ('node',)
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399 operator = None
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400 abstract = True
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diff changeset
401
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402 def as_const(self, eval_ctx=None):
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403 eval_ctx = get_eval_context(self, eval_ctx)
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404 # intercepted operators cannot be folded at compile time
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405 if self.environment.sandboxed and \
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406 self.operator in self.environment.intercepted_unops:
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407 raise Impossible()
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408 f = _uaop_to_func[self.operator]
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409 try:
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410 return f(self.node.as_const(eval_ctx))
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411 except Exception:
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412 raise Impossible()
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parents:
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413
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414
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415 class Name(Expr):
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416 """Looks up a name or stores a value in a name.
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417 The `ctx` of the node can be one of the following values:
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418
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419 - `store`: store a value in the name
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420 - `load`: load that name
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421 - `param`: like `store` but if the name was defined as function parameter.
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422 """
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423 fields = ('name', 'ctx')
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424
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425 def can_assign(self):
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426 return self.name not in ('true', 'false', 'none',
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427 'True', 'False', 'None')
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428
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429
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430 class Literal(Expr):
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431 """Baseclass for literals."""
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432 abstract = True
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433
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434
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435 class Const(Literal):
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436 """All constant values. The parser will return this node for simple
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437 constants such as ``42`` or ``"foo"`` but it can be used to store more
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438 complex values such as lists too. Only constants with a safe
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439 representation (objects where ``eval(repr(x)) == x`` is true).
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440 """
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441 fields = ('value',)
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442
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443 def as_const(self, eval_ctx=None):
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444 return self.value
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445
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446 @classmethod
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447 def from_untrusted(cls, value, lineno=None, environment=None):
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448 """Return a const object if the value is representable as
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449 constant value in the generated code, otherwise it will raise
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450 an `Impossible` exception.
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451 """
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452 from .compiler import has_safe_repr
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453 if not has_safe_repr(value):
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454 raise Impossible()
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455 return cls(value, lineno=lineno, environment=environment)
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456
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457
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458 class TemplateData(Literal):
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459 """A constant template string."""
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460 fields = ('data',)
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461
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462 def as_const(self, eval_ctx=None):
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463 eval_ctx = get_eval_context(self, eval_ctx)
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464 if eval_ctx.volatile:
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465 raise Impossible()
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466 if eval_ctx.autoescape:
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467 return Markup(self.data)
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468 return self.data
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469
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470
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471 class Tuple(Literal):
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472 """For loop unpacking and some other things like multiple arguments
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473 for subscripts. Like for :class:`Name` `ctx` specifies if the tuple
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474 is used for loading the names or storing.
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475 """
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476 fields = ('items', 'ctx')
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477
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478 def as_const(self, eval_ctx=None):
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479 eval_ctx = get_eval_context(self, eval_ctx)
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480 return tuple(x.as_const(eval_ctx) for x in self.items)
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481
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482 def can_assign(self):
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483 for item in self.items:
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484 if not item.can_assign():
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485 return False
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486 return True
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487
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488
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489 class List(Literal):
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490 """Any list literal such as ``[1, 2, 3]``"""
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491 fields = ('items',)
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492
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493 def as_const(self, eval_ctx=None):
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494 eval_ctx = get_eval_context(self, eval_ctx)
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495 return [x.as_const(eval_ctx) for x in self.items]
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496
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497
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498 class Dict(Literal):
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499 """Any dict literal such as ``{1: 2, 3: 4}``. The items must be a list of
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500 :class:`Pair` nodes.
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501 """
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502 fields = ('items',)
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503
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504 def as_const(self, eval_ctx=None):
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505 eval_ctx = get_eval_context(self, eval_ctx)
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506 return dict(x.as_const(eval_ctx) for x in self.items)
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507
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508
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509 class Pair(Helper):
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510 """A key, value pair for dicts."""
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511 fields = ('key', 'value')
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512
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513 def as_const(self, eval_ctx=None):
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514 eval_ctx = get_eval_context(self, eval_ctx)
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515 return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx)
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516
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517
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518 class Keyword(Helper):
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519 """A key, value pair for keyword arguments where key is a string."""
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520 fields = ('key', 'value')
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521
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522 def as_const(self, eval_ctx=None):
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523 eval_ctx = get_eval_context(self, eval_ctx)
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524 return self.key, self.value.as_const(eval_ctx)
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525
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526
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527 class CondExpr(Expr):
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528 """A conditional expression (inline if expression). (``{{
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529 foo if bar else baz }}``)
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530 """
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531 fields = ('test', 'expr1', 'expr2')
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532
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533 def as_const(self, eval_ctx=None):
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534 eval_ctx = get_eval_context(self, eval_ctx)
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535 if self.test.as_const(eval_ctx):
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536 return self.expr1.as_const(eval_ctx)
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537
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538 # if we evaluate to an undefined object, we better do that at runtime
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539 if self.expr2 is None:
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540 raise Impossible()
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541
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542 return self.expr2.as_const(eval_ctx)
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543
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544
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545 class Filter(Expr):
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546 """This node applies a filter on an expression. `name` is the name of
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547 the filter, the rest of the fields are the same as for :class:`Call`.
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548
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549 If the `node` of a filter is `None` the contents of the last buffer are
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550 filtered. Buffers are created by macros and filter blocks.
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551 """
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552 fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
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553
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554 def as_const(self, eval_ctx=None):
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555 eval_ctx = get_eval_context(self, eval_ctx)
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556 if eval_ctx.volatile or self.node is None:
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557 raise Impossible()
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558 # we have to be careful here because we call filter_ below.
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559 # if this variable would be called filter, 2to3 would wrap the
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560 # call in a list beause it is assuming we are talking about the
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561 # builtin filter function here which no longer returns a list in
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562 # python 3. because of that, do not rename filter_ to filter!
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563 filter_ = self.environment.filters.get(self.name)
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564 if filter_ is None or getattr(filter_, 'contextfilter', False):
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565 raise Impossible()
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566 obj = self.node.as_const(eval_ctx)
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567 args = [x.as_const(eval_ctx) for x in self.args]
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568 if getattr(filter_, 'evalcontextfilter', False):
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569 args.insert(0, eval_ctx)
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570 elif getattr(filter_, 'environmentfilter', False):
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571 args.insert(0, self.environment)
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572 kwargs = dict(x.as_const(eval_ctx) for x in self.kwargs)
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573 if self.dyn_args is not None:
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574 try:
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575 args.extend(self.dyn_args.as_const(eval_ctx))
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576 except Exception:
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577 raise Impossible()
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578 if self.dyn_kwargs is not None:
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579 try:
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580 kwargs.update(self.dyn_kwargs.as_const(eval_ctx))
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581 except Exception:
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582 raise Impossible()
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583 try:
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584 return filter_(obj, *args, **kwargs)
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585 except Exception:
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586 raise Impossible()
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587
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588
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589 class Test(Expr):
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590 """Applies a test on an expression. `name` is the name of the test, the
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591 rest of the fields are the same as for :class:`Call`.
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592 """
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593 fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
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594
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595
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596 class Call(Expr):
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597 """Calls an expression. `args` is a list of arguments, `kwargs` a list
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598 of keyword arguments (list of :class:`Keyword` nodes), and `dyn_args`
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599 and `dyn_kwargs` has to be either `None` or a node that is used as
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600 node for dynamic positional (``*args``) or keyword (``**kwargs``)
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601 arguments.
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602 """
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603 fields = ('node', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
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604
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605 def as_const(self, eval_ctx=None):
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606 eval_ctx = get_eval_context(self, eval_ctx)
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607 if eval_ctx.volatile:
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608 raise Impossible()
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609 obj = self.node.as_const(eval_ctx)
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610
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611 # don't evaluate context functions
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612 args = [x.as_const(eval_ctx) for x in self.args]
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613 if isinstance(obj, _context_function_types):
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614 if getattr(obj, 'contextfunction', False):
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615 raise Impossible()
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616 elif getattr(obj, 'evalcontextfunction', False):
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617 args.insert(0, eval_ctx)
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618 elif getattr(obj, 'environmentfunction', False):
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619 args.insert(0, self.environment)
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620
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621 kwargs = dict(x.as_const(eval_ctx) for x in self.kwargs)
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622 if self.dyn_args is not None:
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623 try:
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624 args.extend(self.dyn_args.as_const(eval_ctx))
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625 except Exception:
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626 raise Impossible()
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627 if self.dyn_kwargs is not None:
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628 try:
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629 kwargs.update(self.dyn_kwargs.as_const(eval_ctx))
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630 except Exception:
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631 raise Impossible()
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632 try:
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633 return obj(*args, **kwargs)
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634 except Exception:
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635 raise Impossible()
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636
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637
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638 class Getitem(Expr):
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639 """Get an attribute or item from an expression and prefer the item."""
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640 fields = ('node', 'arg', 'ctx')
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parents:
diff changeset
641
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parents:
diff changeset
642 def as_const(self, eval_ctx=None):
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parents:
diff changeset
643 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
diff changeset
644 if self.ctx != 'load':
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parents:
diff changeset
645 raise Impossible()
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parents:
diff changeset
646 try:
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parents:
diff changeset
647 return self.environment.getitem(self.node.as_const(eval_ctx),
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parents:
diff changeset
648 self.arg.as_const(eval_ctx))
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diff changeset
649 except Exception:
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parents:
diff changeset
650 raise Impossible()
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parents:
diff changeset
651
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diff changeset
652 def can_assign(self):
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653 return False
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parents:
diff changeset
654
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parents:
diff changeset
655
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parents:
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656 class Getattr(Expr):
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657 """Get an attribute or item from an expression that is a ascii-only
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diff changeset
658 bytestring and prefer the attribute.
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diff changeset
659 """
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diff changeset
660 fields = ('node', 'attr', 'ctx')
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diff changeset
661
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diff changeset
662 def as_const(self, eval_ctx=None):
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663 if self.ctx != 'load':
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parents:
diff changeset
664 raise Impossible()
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parents:
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665 try:
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diff changeset
666 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
667 return self.environment.getattr(self.node.as_const(eval_ctx),
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diff changeset
668 self.attr)
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669 except Exception:
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diff changeset
670 raise Impossible()
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parents:
diff changeset
671
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diff changeset
672 def can_assign(self):
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diff changeset
673 return False
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parents:
diff changeset
674
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parents:
diff changeset
675
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diff changeset
676 class Slice(Expr):
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diff changeset
677 """Represents a slice object. This must only be used as argument for
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
678 :class:`Subscript`.
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diff changeset
679 """
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diff changeset
680 fields = ('start', 'stop', 'step')
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diff changeset
681
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diff changeset
682 def as_const(self, eval_ctx=None):
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diff changeset
683 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
684 def const(obj):
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parents:
diff changeset
685 if obj is None:
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diff changeset
686 return None
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parents:
diff changeset
687 return obj.as_const(eval_ctx)
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diff changeset
688 return slice(const(self.start), const(self.stop), const(self.step))
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diff changeset
689
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parents:
diff changeset
690
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691 class Concat(Expr):
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692 """Concatenates the list of expressions provided after converting them to
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
693 unicode.
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diff changeset
694 """
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diff changeset
695 fields = ('nodes',)
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parents:
diff changeset
696
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diff changeset
697 def as_const(self, eval_ctx=None):
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diff changeset
698 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
699 return ''.join(text_type(x.as_const(eval_ctx)) for x in self.nodes)
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diff changeset
700
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parents:
diff changeset
701
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parents:
diff changeset
702 class Compare(Expr):
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diff changeset
703 """Compares an expression with some other expressions. `ops` must be a
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
704 list of :class:`Operand`\s.
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diff changeset
705 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
706 fields = ('expr', 'ops')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
707
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parents:
diff changeset
708 def as_const(self, eval_ctx=None):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
709 eval_ctx = get_eval_context(self, eval_ctx)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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diff changeset
710 result = value = self.expr.as_const(eval_ctx)
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diff changeset
711 try:
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parents:
diff changeset
712 for op in self.ops:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
713 new_value = op.expr.as_const(eval_ctx)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
714 result = _cmpop_to_func[op.op](value, new_value)
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bcclaywell
parents:
diff changeset
715 value = new_value
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
716 except Exception:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
717 raise Impossible()
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
718 return result
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
719
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parents:
diff changeset
720
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
721 class Operand(Helper):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
722 """Holds an operator and an expression."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
723 fields = ('op', 'expr')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
724
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
725 if __debug__:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
726 Operand.__doc__ += '\nThe following operators are available: ' + \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
727 ', '.join(sorted('``%s``' % x for x in set(_binop_to_func) |
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
728 set(_uaop_to_func) | set(_cmpop_to_func)))
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bcclaywell
parents:
diff changeset
729
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
730
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
731 class Mul(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
732 """Multiplies the left with the right node."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
733 operator = '*'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
734
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bcclaywell
parents:
diff changeset
735
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
736 class Div(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
737 """Divides the left by the right node."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
738 operator = '/'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
739
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
740
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
741 class FloorDiv(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
742 """Divides the left by the right node and truncates conver the
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
743 result into an integer by truncating.
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bcclaywell
parents:
diff changeset
744 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
745 operator = '//'
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bcclaywell
parents:
diff changeset
746
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bcclaywell
parents:
diff changeset
747
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bcclaywell
parents:
diff changeset
748 class Add(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
749 """Add the left to the right node."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
750 operator = '+'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
751
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bcclaywell
parents:
diff changeset
752
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
753 class Sub(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
754 """Subtract the right from the left node."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
755 operator = '-'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
756
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
757
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bcclaywell
parents:
diff changeset
758 class Mod(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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759 """Left modulo right."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
760 operator = '%'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
761
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
762
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
763 class Pow(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
764 """Left to the power of right."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
765 operator = '**'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
766
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
767
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
768 class And(BinExpr):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
769 """Short circuited AND."""
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
770 operator = 'and'
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
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771
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772 def as_const(self, eval_ctx=None):
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773 eval_ctx = get_eval_context(self, eval_ctx)
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774 return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx)
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775
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776
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777 class Or(BinExpr):
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778 """Short circuited OR."""
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779 operator = 'or'
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780
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781 def as_const(self, eval_ctx=None):
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782 eval_ctx = get_eval_context(self, eval_ctx)
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783 return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx)
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784
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785
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786 class Not(UnaryExpr):
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787 """Negate the expression."""
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788 operator = 'not'
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789
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790
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791 class Neg(UnaryExpr):
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792 """Make the expression negative."""
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793 operator = '-'
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794
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795
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796 class Pos(UnaryExpr):
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797 """Make the expression positive (noop for most expressions)"""
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798 operator = '+'
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799
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800
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801 # Helpers for extensions
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802
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803
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804 class EnvironmentAttribute(Expr):
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805 """Loads an attribute from the environment object. This is useful for
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806 extensions that want to call a callback stored on the environment.
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807 """
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808 fields = ('name',)
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809
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810
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811 class ExtensionAttribute(Expr):
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812 """Returns the attribute of an extension bound to the environment.
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813 The identifier is the identifier of the :class:`Extension`.
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814
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815 This node is usually constructed by calling the
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816 :meth:`~jinja2.ext.Extension.attr` method on an extension.
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817 """
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818 fields = ('identifier', 'name')
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819
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820
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821 class ImportedName(Expr):
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822 """If created with an import name the import name is returned on node
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823 access. For example ``ImportedName('cgi.escape')`` returns the `escape`
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824 function from the cgi module on evaluation. Imports are optimized by the
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825 compiler so there is no need to assign them to local variables.
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826 """
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827 fields = ('importname',)
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828
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829
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830 class InternalName(Expr):
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831 """An internal name in the compiler. You cannot create these nodes
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832 yourself but the parser provides a
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833 :meth:`~jinja2.parser.Parser.free_identifier` method that creates
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834 a new identifier for you. This identifier is not available from the
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835 template and is not threated specially by the compiler.
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836 """
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837 fields = ('name',)
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838
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839 def __init__(self):
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840 raise TypeError('Can\'t create internal names. Use the '
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841 '`free_identifier` method on a parser.')
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842
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843
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844 class MarkSafe(Expr):
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845 """Mark the wrapped expression as safe (wrap it as `Markup`)."""
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846 fields = ('expr',)
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847
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848 def as_const(self, eval_ctx=None):
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849 eval_ctx = get_eval_context(self, eval_ctx)
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850 return Markup(self.expr.as_const(eval_ctx))
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851
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852
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853 class MarkSafeIfAutoescape(Expr):
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854 """Mark the wrapped expression as safe (wrap it as `Markup`) but
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855 only if autoescaping is active.
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856
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857 .. versionadded:: 2.5
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858 """
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859 fields = ('expr',)
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860
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861 def as_const(self, eval_ctx=None):
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862 eval_ctx = get_eval_context(self, eval_ctx)
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863 if eval_ctx.volatile:
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864 raise Impossible()
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865 expr = self.expr.as_const(eval_ctx)
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866 if eval_ctx.autoescape:
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867 return Markup(expr)
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868 return expr
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869
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870
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871 class ContextReference(Expr):
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872 """Returns the current template context. It can be used like a
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873 :class:`Name` node, with a ``'load'`` ctx and will return the
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874 current :class:`~jinja2.runtime.Context` object.
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875
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876 Here an example that assigns the current template name to a
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877 variable named `foo`::
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878
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879 Assign(Name('foo', ctx='store'),
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880 Getattr(ContextReference(), 'name'))
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881 """
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882
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883
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884 class Continue(Stmt):
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885 """Continue a loop."""
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886
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887
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888 class Break(Stmt):
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889 """Break a loop."""
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890
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891
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892 class Scope(Stmt):
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893 """An artificial scope."""
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894 fields = ('body',)
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895
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896
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897 class EvalContextModifier(Stmt):
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898 """Modifies the eval context. For each option that should be modified,
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899 a :class:`Keyword` has to be added to the :attr:`options` list.
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900
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901 Example to change the `autoescape` setting::
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902
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903 EvalContextModifier(options=[Keyword('autoescape', Const(True))])
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904 """
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905 fields = ('options',)
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906
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907
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908 class ScopedEvalContextModifier(EvalContextModifier):
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909 """Modifies the eval context and reverts it later. Works exactly like
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910 :class:`EvalContextModifier` but will only modify the
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911 :class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`.
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912 """
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913 fields = ('body',)
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914
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915
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916 # make sure nobody creates custom nodes
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917 def _failing_new(*args, **kwargs):
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918 raise TypeError('can\'t create custom node types')
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919 NodeType.__new__ = staticmethod(_failing_new); del _failing_new