Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/jinja2/lexer.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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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 # -*- coding: utf-8 -*-
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2 """
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3 jinja2.lexer
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4 ~~~~~~~~~~~~
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5
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6 This module implements a Jinja / Python combination lexer. The
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7 `Lexer` class provided by this module is used to do some preprocessing
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8 for Jinja.
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9
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10 On the one hand it filters out invalid operators like the bitshift
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11 operators we don't allow in templates. On the other hand it separates
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12 template code and python code in expressions.
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13
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14 :copyright: (c) 2010 by the Jinja Team.
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15 :license: BSD, see LICENSE for more details.
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16 """
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17 import re
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18
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19 from operator import itemgetter
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20 from collections import deque
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21 from jinja2.exceptions import TemplateSyntaxError
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22 from jinja2.utils import LRUCache
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23 from jinja2._compat import iteritems, implements_iterator, text_type, \
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24 intern, PY2
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25
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26
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27 # cache for the lexers. Exists in order to be able to have multiple
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28 # environments with the same lexer
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29 _lexer_cache = LRUCache(50)
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30
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31 # static regular expressions
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32 whitespace_re = re.compile(r'\s+', re.U)
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33 string_re = re.compile(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
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34 r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S)
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35 integer_re = re.compile(r'\d+')
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36
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37 # we use the unicode identifier rule if this python version is able
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38 # to handle unicode identifiers, otherwise the standard ASCII one.
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39 try:
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40 compile('föö', '<unknown>', 'eval')
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41 except SyntaxError:
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42 name_re = re.compile(r'\b[a-zA-Z_][a-zA-Z0-9_]*\b')
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43 else:
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44 from jinja2 import _stringdefs
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45 name_re = re.compile(r'[%s][%s]*' % (_stringdefs.xid_start,
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46 _stringdefs.xid_continue))
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47
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48 float_re = re.compile(r'(?<!\.)\d+\.\d+')
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49 newline_re = re.compile(r'(\r\n|\r|\n)')
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50
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51 # internal the tokens and keep references to them
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52 TOKEN_ADD = intern('add')
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53 TOKEN_ASSIGN = intern('assign')
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54 TOKEN_COLON = intern('colon')
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55 TOKEN_COMMA = intern('comma')
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56 TOKEN_DIV = intern('div')
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57 TOKEN_DOT = intern('dot')
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58 TOKEN_EQ = intern('eq')
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59 TOKEN_FLOORDIV = intern('floordiv')
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60 TOKEN_GT = intern('gt')
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61 TOKEN_GTEQ = intern('gteq')
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62 TOKEN_LBRACE = intern('lbrace')
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63 TOKEN_LBRACKET = intern('lbracket')
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64 TOKEN_LPAREN = intern('lparen')
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65 TOKEN_LT = intern('lt')
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66 TOKEN_LTEQ = intern('lteq')
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67 TOKEN_MOD = intern('mod')
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68 TOKEN_MUL = intern('mul')
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69 TOKEN_NE = intern('ne')
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70 TOKEN_PIPE = intern('pipe')
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71 TOKEN_POW = intern('pow')
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72 TOKEN_RBRACE = intern('rbrace')
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73 TOKEN_RBRACKET = intern('rbracket')
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74 TOKEN_RPAREN = intern('rparen')
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75 TOKEN_SEMICOLON = intern('semicolon')
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76 TOKEN_SUB = intern('sub')
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77 TOKEN_TILDE = intern('tilde')
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78 TOKEN_WHITESPACE = intern('whitespace')
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79 TOKEN_FLOAT = intern('float')
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80 TOKEN_INTEGER = intern('integer')
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81 TOKEN_NAME = intern('name')
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82 TOKEN_STRING = intern('string')
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83 TOKEN_OPERATOR = intern('operator')
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84 TOKEN_BLOCK_BEGIN = intern('block_begin')
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85 TOKEN_BLOCK_END = intern('block_end')
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86 TOKEN_VARIABLE_BEGIN = intern('variable_begin')
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87 TOKEN_VARIABLE_END = intern('variable_end')
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88 TOKEN_RAW_BEGIN = intern('raw_begin')
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89 TOKEN_RAW_END = intern('raw_end')
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90 TOKEN_COMMENT_BEGIN = intern('comment_begin')
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91 TOKEN_COMMENT_END = intern('comment_end')
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92 TOKEN_COMMENT = intern('comment')
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93 TOKEN_LINESTATEMENT_BEGIN = intern('linestatement_begin')
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94 TOKEN_LINESTATEMENT_END = intern('linestatement_end')
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95 TOKEN_LINECOMMENT_BEGIN = intern('linecomment_begin')
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96 TOKEN_LINECOMMENT_END = intern('linecomment_end')
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97 TOKEN_LINECOMMENT = intern('linecomment')
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98 TOKEN_DATA = intern('data')
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99 TOKEN_INITIAL = intern('initial')
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100 TOKEN_EOF = intern('eof')
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101
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102 # bind operators to token types
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103 operators = {
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104 '+': TOKEN_ADD,
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105 '-': TOKEN_SUB,
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106 '/': TOKEN_DIV,
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107 '//': TOKEN_FLOORDIV,
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108 '*': TOKEN_MUL,
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109 '%': TOKEN_MOD,
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110 '**': TOKEN_POW,
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111 '~': TOKEN_TILDE,
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112 '[': TOKEN_LBRACKET,
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113 ']': TOKEN_RBRACKET,
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114 '(': TOKEN_LPAREN,
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115 ')': TOKEN_RPAREN,
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116 '{': TOKEN_LBRACE,
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117 '}': TOKEN_RBRACE,
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118 '==': TOKEN_EQ,
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119 '!=': TOKEN_NE,
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120 '>': TOKEN_GT,
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121 '>=': TOKEN_GTEQ,
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122 '<': TOKEN_LT,
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123 '<=': TOKEN_LTEQ,
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124 '=': TOKEN_ASSIGN,
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125 '.': TOKEN_DOT,
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126 ':': TOKEN_COLON,
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127 '|': TOKEN_PIPE,
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128 ',': TOKEN_COMMA,
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129 ';': TOKEN_SEMICOLON
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130 }
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131
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132 reverse_operators = dict([(v, k) for k, v in iteritems(operators)])
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133 assert len(operators) == len(reverse_operators), 'operators dropped'
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134 operator_re = re.compile('(%s)' % '|'.join(re.escape(x) for x in
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135 sorted(operators, key=lambda x: -len(x))))
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136
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137 ignored_tokens = frozenset([TOKEN_COMMENT_BEGIN, TOKEN_COMMENT,
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138 TOKEN_COMMENT_END, TOKEN_WHITESPACE,
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139 TOKEN_LINECOMMENT_BEGIN, TOKEN_LINECOMMENT_END,
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140 TOKEN_LINECOMMENT])
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141 ignore_if_empty = frozenset([TOKEN_WHITESPACE, TOKEN_DATA,
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142 TOKEN_COMMENT, TOKEN_LINECOMMENT])
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143
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144
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145 def _describe_token_type(token_type):
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146 if token_type in reverse_operators:
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147 return reverse_operators[token_type]
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148 return {
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149 TOKEN_COMMENT_BEGIN: 'begin of comment',
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150 TOKEN_COMMENT_END: 'end of comment',
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151 TOKEN_COMMENT: 'comment',
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152 TOKEN_LINECOMMENT: 'comment',
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153 TOKEN_BLOCK_BEGIN: 'begin of statement block',
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154 TOKEN_BLOCK_END: 'end of statement block',
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155 TOKEN_VARIABLE_BEGIN: 'begin of print statement',
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156 TOKEN_VARIABLE_END: 'end of print statement',
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157 TOKEN_LINESTATEMENT_BEGIN: 'begin of line statement',
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158 TOKEN_LINESTATEMENT_END: 'end of line statement',
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159 TOKEN_DATA: 'template data / text',
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160 TOKEN_EOF: 'end of template'
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161 }.get(token_type, token_type)
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162
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163
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164 def describe_token(token):
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165 """Returns a description of the token."""
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166 if token.type == 'name':
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167 return token.value
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168 return _describe_token_type(token.type)
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169
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170
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171 def describe_token_expr(expr):
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172 """Like `describe_token` but for token expressions."""
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173 if ':' in expr:
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174 type, value = expr.split(':', 1)
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175 if type == 'name':
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176 return value
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177 else:
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178 type = expr
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179 return _describe_token_type(type)
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180
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181
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182 def count_newlines(value):
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183 """Count the number of newline characters in the string. This is
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184 useful for extensions that filter a stream.
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185 """
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186 return len(newline_re.findall(value))
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187
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188
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189 def compile_rules(environment):
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190 """Compiles all the rules from the environment into a list of rules."""
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191 e = re.escape
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192 rules = [
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193 (len(environment.comment_start_string), 'comment',
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194 e(environment.comment_start_string)),
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195 (len(environment.block_start_string), 'block',
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196 e(environment.block_start_string)),
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197 (len(environment.variable_start_string), 'variable',
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198 e(environment.variable_start_string))
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199 ]
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200
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201 if environment.line_statement_prefix is not None:
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202 rules.append((len(environment.line_statement_prefix), 'linestatement',
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203 r'^[ \t\v]*' + e(environment.line_statement_prefix)))
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204 if environment.line_comment_prefix is not None:
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205 rules.append((len(environment.line_comment_prefix), 'linecomment',
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206 r'(?:^|(?<=\S))[^\S\r\n]*' +
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207 e(environment.line_comment_prefix)))
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208
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209 return [x[1:] for x in sorted(rules, reverse=True)]
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210
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211
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212 class Failure(object):
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213 """Class that raises a `TemplateSyntaxError` if called.
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214 Used by the `Lexer` to specify known errors.
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215 """
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216
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217 def __init__(self, message, cls=TemplateSyntaxError):
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218 self.message = message
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219 self.error_class = cls
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220
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221 def __call__(self, lineno, filename):
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222 raise self.error_class(self.message, lineno, filename)
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223
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224
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225 class Token(tuple):
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226 """Token class."""
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227 __slots__ = ()
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228 lineno, type, value = (property(itemgetter(x)) for x in range(3))
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229
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230 def __new__(cls, lineno, type, value):
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231 return tuple.__new__(cls, (lineno, intern(str(type)), value))
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232
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233 def __str__(self):
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234 if self.type in reverse_operators:
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235 return reverse_operators[self.type]
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236 elif self.type == 'name':
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237 return self.value
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238 return self.type
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239
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240 def test(self, expr):
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241 """Test a token against a token expression. This can either be a
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242 token type or ``'token_type:token_value'``. This can only test
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243 against string values and types.
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244 """
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245 # here we do a regular string equality check as test_any is usually
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246 # passed an iterable of not interned strings.
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247 if self.type == expr:
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248 return True
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249 elif ':' in expr:
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250 return expr.split(':', 1) == [self.type, self.value]
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251 return False
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252
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253 def test_any(self, *iterable):
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254 """Test against multiple token expressions."""
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255 for expr in iterable:
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256 if self.test(expr):
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257 return True
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258 return False
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259
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260 def __repr__(self):
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261 return 'Token(%r, %r, %r)' % (
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262 self.lineno,
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263 self.type,
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264 self.value
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265 )
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266
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267
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268 @implements_iterator
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269 class TokenStreamIterator(object):
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270 """The iterator for tokenstreams. Iterate over the stream
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271 until the eof token is reached.
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272 """
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273
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274 def __init__(self, stream):
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275 self.stream = stream
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276
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277 def __iter__(self):
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278 return self
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279
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280 def __next__(self):
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281 token = self.stream.current
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282 if token.type is TOKEN_EOF:
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283 self.stream.close()
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284 raise StopIteration()
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285 next(self.stream)
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286 return token
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287
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288
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289 @implements_iterator
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290 class TokenStream(object):
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291 """A token stream is an iterable that yields :class:`Token`\s. The
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292 parser however does not iterate over it but calls :meth:`next` to go
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293 one token ahead. The current active token is stored as :attr:`current`.
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294 """
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295
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296 def __init__(self, generator, name, filename):
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297 self._iter = iter(generator)
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298 self._pushed = deque()
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299 self.name = name
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300 self.filename = filename
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301 self.closed = False
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302 self.current = Token(1, TOKEN_INITIAL, '')
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303 next(self)
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304
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305 def __iter__(self):
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306 return TokenStreamIterator(self)
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307
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308 def __bool__(self):
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309 return bool(self._pushed) or self.current.type is not TOKEN_EOF
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310 __nonzero__ = __bool__ # py2
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311
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312 eos = property(lambda x: not x, doc="Are we at the end of the stream?")
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313
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314 def push(self, token):
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315 """Push a token back to the stream."""
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316 self._pushed.append(token)
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317
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318 def look(self):
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319 """Look at the next token."""
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320 old_token = next(self)
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321 result = self.current
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322 self.push(result)
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323 self.current = old_token
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324 return result
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325
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326 def skip(self, n=1):
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327 """Got n tokens ahead."""
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328 for x in range(n):
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329 next(self)
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330
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331 def next_if(self, expr):
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332 """Perform the token test and return the token if it matched.
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333 Otherwise the return value is `None`.
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334 """
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335 if self.current.test(expr):
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336 return next(self)
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337
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338 def skip_if(self, expr):
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339 """Like :meth:`next_if` but only returns `True` or `False`."""
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340 return self.next_if(expr) is not None
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341
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342 def __next__(self):
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343 """Go one token ahead and return the old one"""
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344 rv = self.current
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345 if self._pushed:
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346 self.current = self._pushed.popleft()
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347 elif self.current.type is not TOKEN_EOF:
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348 try:
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349 self.current = next(self._iter)
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350 except StopIteration:
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351 self.close()
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352 return rv
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353
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354 def close(self):
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355 """Close the stream."""
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356 self.current = Token(self.current.lineno, TOKEN_EOF, '')
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357 self._iter = None
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358 self.closed = True
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359
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360 def expect(self, expr):
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361 """Expect a given token type and return it. This accepts the same
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362 argument as :meth:`jinja2.lexer.Token.test`.
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363 """
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364 if not self.current.test(expr):
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365 expr = describe_token_expr(expr)
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366 if self.current.type is TOKEN_EOF:
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367 raise TemplateSyntaxError('unexpected end of template, '
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368 'expected %r.' % expr,
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369 self.current.lineno,
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370 self.name, self.filename)
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371 raise TemplateSyntaxError("expected token %r, got %r" %
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372 (expr, describe_token(self.current)),
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373 self.current.lineno,
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374 self.name, self.filename)
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375 try:
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376 return self.current
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377 finally:
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378 next(self)
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379
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380
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381 def get_lexer(environment):
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382 """Return a lexer which is probably cached."""
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383 key = (environment.block_start_string,
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384 environment.block_end_string,
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385 environment.variable_start_string,
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386 environment.variable_end_string,
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387 environment.comment_start_string,
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388 environment.comment_end_string,
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389 environment.line_statement_prefix,
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390 environment.line_comment_prefix,
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391 environment.trim_blocks,
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392 environment.lstrip_blocks,
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393 environment.newline_sequence,
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394 environment.keep_trailing_newline)
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395 lexer = _lexer_cache.get(key)
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396 if lexer is None:
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397 lexer = Lexer(environment)
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398 _lexer_cache[key] = lexer
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399 return lexer
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400
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401
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402 class Lexer(object):
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403 """Class that implements a lexer for a given environment. Automatically
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404 created by the environment class, usually you don't have to do that.
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405
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406 Note that the lexer is not automatically bound to an environment.
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407 Multiple environments can share the same lexer.
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408 """
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409
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410 def __init__(self, environment):
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411 # shortcuts
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412 c = lambda x: re.compile(x, re.M | re.S)
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413 e = re.escape
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414
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415 # lexing rules for tags
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416 tag_rules = [
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417 (whitespace_re, TOKEN_WHITESPACE, None),
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418 (float_re, TOKEN_FLOAT, None),
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419 (integer_re, TOKEN_INTEGER, None),
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420 (name_re, TOKEN_NAME, None),
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421 (string_re, TOKEN_STRING, None),
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422 (operator_re, TOKEN_OPERATOR, None)
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423 ]
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424
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425 # assemble the root lexing rule. because "|" is ungreedy
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426 # we have to sort by length so that the lexer continues working
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427 # as expected when we have parsing rules like <% for block and
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428 # <%= for variables. (if someone wants asp like syntax)
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429 # variables are just part of the rules if variable processing
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430 # is required.
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431 root_tag_rules = compile_rules(environment)
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432
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433 # block suffix if trimming is enabled
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434 block_suffix_re = environment.trim_blocks and '\\n?' or ''
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435
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436 # strip leading spaces if lstrip_blocks is enabled
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437 prefix_re = {}
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438 if environment.lstrip_blocks:
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439 # use '{%+' to manually disable lstrip_blocks behavior
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440 no_lstrip_re = e('+')
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441 # detect overlap between block and variable or comment strings
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442 block_diff = c(r'^%s(.*)' % e(environment.block_start_string))
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443 # make sure we don't mistake a block for a variable or a comment
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444 m = block_diff.match(environment.comment_start_string)
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445 no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
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446 m = block_diff.match(environment.variable_start_string)
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447 no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
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448
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449 # detect overlap between comment and variable strings
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450 comment_diff = c(r'^%s(.*)' % e(environment.comment_start_string))
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451 m = comment_diff.match(environment.variable_start_string)
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452 no_variable_re = m and r'(?!%s)' % e(m.group(1)) or ''
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453
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454 lstrip_re = r'^[ \t]*'
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455 block_prefix_re = r'%s%s(?!%s)|%s\+?' % (
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456 lstrip_re,
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457 e(environment.block_start_string),
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458 no_lstrip_re,
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459 e(environment.block_start_string),
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460 )
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461 comment_prefix_re = r'%s%s%s|%s\+?' % (
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462 lstrip_re,
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463 e(environment.comment_start_string),
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464 no_variable_re,
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465 e(environment.comment_start_string),
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466 )
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467 prefix_re['block'] = block_prefix_re
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468 prefix_re['comment'] = comment_prefix_re
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469 else:
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470 block_prefix_re = '%s' % e(environment.block_start_string)
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471
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472 self.newline_sequence = environment.newline_sequence
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473 self.keep_trailing_newline = environment.keep_trailing_newline
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474
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475 # global lexing rules
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476 self.rules = {
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477 'root': [
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478 # directives
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479 (c('(.*?)(?:%s)' % '|'.join(
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480 [r'(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))' % (
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481 e(environment.block_start_string),
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482 block_prefix_re,
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483 e(environment.block_end_string),
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484 e(environment.block_end_string)
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485 )] + [
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486 r'(?P<%s_begin>\s*%s\-|%s)' % (n, r, prefix_re.get(n,r))
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487 for n, r in root_tag_rules
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488 ])), (TOKEN_DATA, '#bygroup'), '#bygroup'),
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489 # data
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490 (c('.+'), TOKEN_DATA, None)
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491 ],
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492 # comments
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493 TOKEN_COMMENT_BEGIN: [
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494 (c(r'(.*?)((?:\-%s\s*|%s)%s)' % (
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495 e(environment.comment_end_string),
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496 e(environment.comment_end_string),
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497 block_suffix_re
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498 )), (TOKEN_COMMENT, TOKEN_COMMENT_END), '#pop'),
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499 (c('(.)'), (Failure('Missing end of comment tag'),), None)
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500 ],
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501 # blocks
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502 TOKEN_BLOCK_BEGIN: [
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parents:
diff changeset
503 (c('(?:\-%s\s*|%s)%s' % (
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parents:
diff changeset
504 e(environment.block_end_string),
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parents:
diff changeset
505 e(environment.block_end_string),
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parents:
diff changeset
506 block_suffix_re
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parents:
diff changeset
507 )), TOKEN_BLOCK_END, '#pop'),
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parents:
diff changeset
508 ] + tag_rules,
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bcclaywell
parents:
diff changeset
509 # variables
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parents:
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510 TOKEN_VARIABLE_BEGIN: [
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parents:
diff changeset
511 (c('\-%s\s*|%s' % (
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parents:
diff changeset
512 e(environment.variable_end_string),
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parents:
diff changeset
513 e(environment.variable_end_string)
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diff changeset
514 )), TOKEN_VARIABLE_END, '#pop')
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parents:
diff changeset
515 ] + tag_rules,
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bcclaywell
parents:
diff changeset
516 # raw block
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517 TOKEN_RAW_BEGIN: [
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parents:
diff changeset
518 (c('(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % (
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bcclaywell
parents:
diff changeset
519 e(environment.block_start_string),
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bcclaywell
parents:
diff changeset
520 block_prefix_re,
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parents:
diff changeset
521 e(environment.block_end_string),
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parents:
diff changeset
522 e(environment.block_end_string),
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parents:
diff changeset
523 block_suffix_re
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parents:
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524 )), (TOKEN_DATA, TOKEN_RAW_END), '#pop'),
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525 (c('(.)'), (Failure('Missing end of raw directive'),), None)
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bcclaywell
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526 ],
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bcclaywell
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diff changeset
527 # line statements
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528 TOKEN_LINESTATEMENT_BEGIN: [
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parents:
diff changeset
529 (c(r'\s*(\n|$)'), TOKEN_LINESTATEMENT_END, '#pop')
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parents:
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530 ] + tag_rules,
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bcclaywell
parents:
diff changeset
531 # line comments
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532 TOKEN_LINECOMMENT_BEGIN: [
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parents:
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533 (c(r'(.*?)()(?=\n|$)'), (TOKEN_LINECOMMENT,
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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534 TOKEN_LINECOMMENT_END), '#pop')
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parents:
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535 ]
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parents:
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536 }
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parents:
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537
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538 def _normalize_newlines(self, value):
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bcclaywell
parents:
diff changeset
539 """Called for strings and template data to normalize it to unicode."""
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540 return newline_re.sub(self.newline_sequence, value)
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541
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542 def tokenize(self, source, name=None, filename=None, state=None):
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parents:
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543 """Calls tokeniter + tokenize and wraps it in a token stream.
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bcclaywell
parents:
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544 """
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parents:
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545 stream = self.tokeniter(source, name, filename, state)
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546 return TokenStream(self.wrap(stream, name, filename), name, filename)
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547
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548 def wrap(self, stream, name=None, filename=None):
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549 """This is called with the stream as returned by `tokenize` and wraps
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550 every token in a :class:`Token` and converts the value.
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551 """
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parents:
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552 for lineno, token, value in stream:
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553 if token in ignored_tokens:
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parents:
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554 continue
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555 elif token == 'linestatement_begin':
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556 token = 'block_begin'
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parents:
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557 elif token == 'linestatement_end':
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parents:
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558 token = 'block_end'
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parents:
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559 # we are not interested in those tokens in the parser
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parents:
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560 elif token in ('raw_begin', 'raw_end'):
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bcclaywell
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diff changeset
561 continue
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bcclaywell
parents:
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562 elif token == 'data':
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563 value = self._normalize_newlines(value)
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parents:
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564 elif token == 'keyword':
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565 token = value
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parents:
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566 elif token == 'name':
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567 value = str(value)
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parents:
diff changeset
568 elif token == 'string':
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bcclaywell
parents:
diff changeset
569 # try to unescape string
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parents:
diff changeset
570 try:
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571 value = self._normalize_newlines(value[1:-1]) \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
572 .encode('ascii', 'backslashreplace') \
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
573 .decode('unicode-escape')
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bcclaywell
parents:
diff changeset
574 except Exception as e:
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bcclaywell
parents:
diff changeset
575 msg = str(e).split(':')[-1].strip()
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bcclaywell
parents:
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576 raise TemplateSyntaxError(msg, lineno, name, filename)
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bcclaywell
parents:
diff changeset
577 # if we can express it as bytestring (ascii only)
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parents:
diff changeset
578 # we do that for support of semi broken APIs
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parents:
diff changeset
579 # as datetime.datetime.strftime. On python 3 this
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bcclaywell
parents:
diff changeset
580 # call becomes a noop thanks to 2to3
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
581 if PY2:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
582 try:
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bcclaywell
parents:
diff changeset
583 value = value.encode('ascii')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
584 except UnicodeError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
585 pass
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bcclaywell
parents:
diff changeset
586 elif token == 'integer':
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bcclaywell
parents:
diff changeset
587 value = int(value)
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bcclaywell
parents:
diff changeset
588 elif token == 'float':
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bcclaywell
parents:
diff changeset
589 value = float(value)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
590 elif token == 'operator':
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bcclaywell
parents:
diff changeset
591 token = operators[value]
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bcclaywell
parents:
diff changeset
592 yield Token(lineno, token, value)
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bcclaywell
parents:
diff changeset
593
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bcclaywell
parents:
diff changeset
594 def tokeniter(self, source, name, filename=None, state=None):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
595 """This method tokenizes the text and returns the tokens in a
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
596 generator. Use this method if you just want to tokenize a template.
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bcclaywell
parents:
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597 """
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bcclaywell
parents:
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598 source = text_type(source)
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bcclaywell
parents:
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599 lines = source.splitlines()
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bcclaywell
parents:
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600 if self.keep_trailing_newline and source:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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601 for newline in ('\r\n', '\r', '\n'):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
602 if source.endswith(newline):
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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603 lines.append('')
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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604 break
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
605 source = '\n'.join(lines)
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
606 pos = 0
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
607 lineno = 1
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bcclaywell
parents:
diff changeset
608 stack = ['root']
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
609 if state is not None and state != 'root':
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
610 assert state in ('variable', 'block'), 'invalid state'
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bcclaywell
parents:
diff changeset
611 stack.append(state + '_begin')
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bcclaywell
parents:
diff changeset
612 else:
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bcclaywell
parents:
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613 state = 'root'
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parents:
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614 statetokens = self.rules[stack[-1]]
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bcclaywell
parents:
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615 source_length = len(source)
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bcclaywell
parents:
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616
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bcclaywell
parents:
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617 balancing_stack = []
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bcclaywell
parents:
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618
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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619 while 1:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
620 # tokenizer loop
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parents:
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621 for regex, tokens, new_state in statetokens:
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parents:
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622 m = regex.match(source, pos)
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bcclaywell
parents:
diff changeset
623 # if no match we try again with the next rule
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bcclaywell
parents:
diff changeset
624 if m is None:
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bcclaywell
parents:
diff changeset
625 continue
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bcclaywell
parents:
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626
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bcclaywell
parents:
diff changeset
627 # we only match blocks and variables if braces / parentheses
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bcclaywell
parents:
diff changeset
628 # are balanced. continue parsing with the lower rule which
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629 # is the operator rule. do this only if the end tags look
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630 # like operators
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631 if balancing_stack and \
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632 tokens in ('variable_end', 'block_end',
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633 'linestatement_end'):
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634 continue
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635
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636 # tuples support more options
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637 if isinstance(tokens, tuple):
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638 for idx, token in enumerate(tokens):
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639 # failure group
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640 if token.__class__ is Failure:
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641 raise token(lineno, filename)
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642 # bygroup is a bit more complex, in that case we
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643 # yield for the current token the first named
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644 # group that matched
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645 elif token == '#bygroup':
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646 for key, value in iteritems(m.groupdict()):
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647 if value is not None:
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648 yield lineno, key, value
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649 lineno += value.count('\n')
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650 break
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651 else:
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652 raise RuntimeError('%r wanted to resolve '
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653 'the token dynamically'
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654 ' but no group matched'
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655 % regex)
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656 # normal group
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657 else:
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658 data = m.group(idx + 1)
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659 if data or token not in ignore_if_empty:
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660 yield lineno, token, data
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661 lineno += data.count('\n')
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662
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663 # strings as token just are yielded as it.
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664 else:
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665 data = m.group()
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666 # update brace/parentheses balance
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667 if tokens == 'operator':
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668 if data == '{':
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669 balancing_stack.append('}')
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670 elif data == '(':
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671 balancing_stack.append(')')
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672 elif data == '[':
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673 balancing_stack.append(']')
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674 elif data in ('}', ')', ']'):
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675 if not balancing_stack:
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676 raise TemplateSyntaxError('unexpected \'%s\'' %
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677 data, lineno, name,
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678 filename)
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679 expected_op = balancing_stack.pop()
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680 if expected_op != data:
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681 raise TemplateSyntaxError('unexpected \'%s\', '
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682 'expected \'%s\'' %
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683 (data, expected_op),
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684 lineno, name,
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685 filename)
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686 # yield items
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687 if data or tokens not in ignore_if_empty:
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688 yield lineno, tokens, data
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689 lineno += data.count('\n')
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690
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691 # fetch new position into new variable so that we can check
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692 # if there is a internal parsing error which would result
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693 # in an infinite loop
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694 pos2 = m.end()
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695
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696 # handle state changes
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697 if new_state is not None:
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698 # remove the uppermost state
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699 if new_state == '#pop':
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700 stack.pop()
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701 # resolve the new state by group checking
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702 elif new_state == '#bygroup':
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703 for key, value in iteritems(m.groupdict()):
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704 if value is not None:
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705 stack.append(key)
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706 break
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707 else:
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708 raise RuntimeError('%r wanted to resolve the '
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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709 'new state dynamically but'
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710 ' no group matched' %
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711 regex)
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712 # direct state name given
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713 else:
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714 stack.append(new_state)
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715 statetokens = self.rules[stack[-1]]
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716 # we are still at the same position and no stack change.
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717 # this means a loop without break condition, avoid that and
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718 # raise error
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parents:
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719 elif pos2 == pos:
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720 raise RuntimeError('%r yielded empty string without '
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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721 'stack change' % regex)
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parents:
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722 # publish new function and start again
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parents:
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723 pos = pos2
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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724 break
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parents:
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725 # if loop terminated without break we haven't found a single match
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726 # either we are at the end of the file or we have a problem
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727 else:
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parents:
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728 # end of text
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parents:
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729 if pos >= source_length:
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parents:
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730 return
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parents:
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731 # something went wrong
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732 raise TemplateSyntaxError('unexpected char %r at %d' %
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parents:
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733 (source[pos], pos), lineno,
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parents:
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734 name, filename)