Mercurial > repos > jankanis > blast2html
annotate blast2html.py @ 111:1faac255ae3c draft default tip
update version to 0.0.12
| author | Jan Kanis <jan.code@jankanis.nl> |
|---|---|
| date | Tue, 08 Jul 2014 17:05:54 +0200 |
| parents | ee2b105d772a |
| children |
| rev | line source |
|---|---|
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1 #!/usr/bin/env python3 |
| 52 | 2 # -*- coding: utf-8 -*- |
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3 |
| 77 | 4 # Actually this program works with both python 2 and 3, tested against python 2.6 |
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5 |
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6 # Copyright The Hyve B.V. 2014 |
| 74 | 7 # License: GPL version 3 or (at your option) any higher version |
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8 |
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9 from __future__ import unicode_literals, division |
| 52 | 10 |
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11 import sys |
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12 import math |
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13 import warnings |
| 107 | 14 import six, codecs, io |
| 77 | 15 from six.moves import builtins |
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16 from os import path |
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17 from itertools import repeat |
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18 from collections import defaultdict |
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19 import glob |
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20 import argparse |
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21 from lxml import objectify |
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22 import jinja2 |
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23 |
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24 builtin_str = str |
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25 str = six.text_type |
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26 |
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27 |
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28 |
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29 _filters = dict(float='float') |
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30 def filter(func_or_name): |
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31 "Decorator to register a function as filter in the current jinja environment" |
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32 if isinstance(func_or_name, six.string_types): |
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33 def inner(func): |
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34 _filters[func_or_name] = func.__name__ |
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35 return func |
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36 return inner |
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37 else: |
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38 _filters[func_or_name.__name__] = func_or_name.__name__ |
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39 return func_or_name |
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40 |
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41 |
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42 def color_idx(length): |
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43 if length < 40: |
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44 return 0 |
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45 elif length < 50: |
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46 return 1 |
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47 elif length < 80: |
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48 return 2 |
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49 elif length < 200: |
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50 return 3 |
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51 return 4 |
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52 |
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53 @filter |
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54 def fmt(val, fmt): |
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55 return format(float(val), fmt) |
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56 |
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57 @filter |
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58 def numfmt(val): |
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59 """Format numbers in decimal notation, but without excessive trailing 0's. |
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60 Default python float formatting will use scientific notation for some values, |
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61 or append trailing zeros with the 'f' format type, and the number of digits differs |
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62 between python 2 and 3.""" |
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63 fpart, ipart = math.modf(val) |
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64 if fpart == 0: |
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65 return str(int(val)) |
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66 # round to 10 to get identical representations in python 2 and 3 |
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67 s = format(round(val, 10), '.10f').rstrip('0') |
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68 if s[-1] == '.': |
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69 s += '0' |
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70 return s |
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71 |
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72 @filter |
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73 def firsttitle(hit): |
| 99 | 74 return str(hit.Hit_def).split('>')[0] |
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75 |
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76 @filter |
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77 def othertitles(hit): |
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78 """Split a hit.Hit_def that contains multiple titles up, splitting out the hit ids from the titles.""" |
| 99 | 79 id_titles = str(hit.Hit_def).split('>') |
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80 |
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81 titles = [] |
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82 for t in id_titles[1:]: |
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83 id, title = t.split(' ', 1) |
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84 titles.append(argparse.Namespace(Hit_id = id, |
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85 Hit_def = title, |
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86 Hit_accession = '', |
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87 getroottree = hit.getroottree)) |
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88 return titles |
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89 |
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90 @filter |
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91 def hitid(hit): |
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92 return str(hit.Hit_id) |
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93 |
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94 |
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95 @filter |
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96 def alignment_pre(hsp): |
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97 """Create the preformatted alignment blocks""" |
| 73 | 98 |
| 99 # line break length | |
| 100 linewidth = 60 | |
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101 |
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102 qfrom = int(hsp['Hsp_query-from']) |
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103 qto = int(hsp['Hsp_query-to']) |
| 71 | 104 qframe = int(hsp['Hsp_query-frame']) |
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105 hfrom = int(hsp['Hsp_hit-from']) |
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106 hto = int(hsp['Hsp_hit-to']) |
| 71 | 107 hframe = int(hsp['Hsp_hit-frame']) |
| 73 | 108 |
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109 qseq = hsp.Hsp_qseq.text |
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110 midline = hsp.Hsp_midline.text |
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111 hseq = hsp.Hsp_hseq.text |
| 71 | 112 |
| 73 | 113 if not qframe in (1, -1): |
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114 warnings.warn("Error in BlastXML input: Hsp node {0} has a Hsp_query-frame of {1}. (should be 1 or -1)".format(nodeid(hsp), qframe)) |
| 71 | 115 qframe = -1 if qframe < 0 else 1 |
| 73 | 116 if not hframe in (1, -1): |
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117 warnings.warn("Error in BlastXML input: Hsp node {0} has a Hsp_hit-frame of {1}. (should be 1 or -1)".format(nodeid(hsp), hframe)) |
| 71 | 118 hframe = -1 if hframe < 0 else 1 |
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119 |
| 71 | 120 def split(txt): |
| 73 | 121 return [txt[i:i+linewidth] for i in range(0, len(txt), linewidth)] |
| 71 | 122 |
| 73 | 123 for qs, mid, hs, offset in zip(split(qseq), split(midline), split(hseq), range(0, len(qseq), linewidth)): |
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124 yield ( |
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125 "Query {0:>7} {1} {2}\n".format(qfrom+offset*qframe, qs, qfrom+(offset+len(qs)-1)*qframe) + |
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126 " {0:7} {1}\n".format('', mid) + |
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127 "Subject{0:>7} {1} {2}".format(hfrom+offset*hframe, hs, hfrom+(offset+len(hs)-1)*hframe) |
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128 ) |
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129 |
| 71 | 130 if qfrom+(len(qseq)-1)*qframe != qto: |
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131 warnings.warn("Error in BlastXML input: Hsp node {0} qseq length mismatch: from {1} to {2} length {3}".format( |
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132 nodeid(hsp), qfrom, qto, len(qseq))) |
| 71 | 133 if hfrom+(len(hseq)-1)*hframe != hto: |
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134 warnings.warn("Error in BlastXML input: Hsp node {0} hseq length mismatch: from {1} to {2} length {3}".format( |
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135 nodeid(hsp), hfrom, hto, len(hseq))) |
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136 |
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137 |
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138 |
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139 @filter('len') |
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140 def blastxml_len(node): |
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141 if node.tag == 'Hsp': |
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142 return int(node['Hsp_align-len']) |
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143 elif node.tag == 'Iteration': |
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144 return int(node['Iteration_query-len']) |
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145 raise Exception("Unknown XML node type: "+node.tag) |
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146 |
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147 @filter |
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148 def nodeid(node): |
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149 id = [] |
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150 if node.tag == 'Hsp': |
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151 id.insert(0, node.Hsp_num.text) |
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152 node = node.getparent().getparent() |
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153 assert node.tag == 'Hit' |
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154 if node.tag == 'Hit': |
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155 id.insert(0, node.Hit_num.text) |
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156 node = node.getparent().getparent() |
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157 assert node.tag == 'Iteration' |
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158 if node.tag == 'Iteration': |
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159 id.insert(0, node['Iteration_iter-num'].text) |
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160 return '-'.join(id) |
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161 raise ValueError("The nodeid filter can only be applied to Hsp, Hit or Iteration nodes in a BlastXML document") |
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162 |
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163 |
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164 @filter |
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165 def asframe(frame): |
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166 if frame == 1: |
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167 return 'Plus' |
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168 elif frame == -1: |
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169 return 'Minus' |
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170 raise Exception("frame should be either +1 or -1") |
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171 |
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172 # def genelink(hit, type='genbank', hsp=None): |
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173 # if not isinstance(hit, six.string_types): |
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174 # hit = hitid(hit) |
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175 # link = "http://www.ncbi.nlm.nih.gov/nucleotide/{0}?report={1}&log$=nuclalign".format(hit, type) |
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176 # if hsp != None: |
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177 # link += "&from={0}&to={1}".format(hsp['Hsp_hit-from'], hsp['Hsp_hit-to']) |
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178 # return link |
| 18 | 179 |
| 180 | |
| 181 # javascript escape filter based on Django's, from https://github.com/dsissitka/khan-website/blob/master/templatefilters.py#L112-139 | |
| 182 # I've removed the html escapes, since html escaping is already being performed by the template engine. | |
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183 |
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184 # The r'\u0027' syntax doesn't work the way we need to in python 2.6 with unicode_literals |
| 18 | 185 _base_js_escapes = ( |
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186 ('\\', '\\u005C'), |
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187 ('\'', '\\u0027'), |
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188 ('"', '\\u0022'), |
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189 # ('>', '\\u003E'), |
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190 # ('<', '\\u003C'), |
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191 # ('&', '\\u0026'), |
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192 # ('=', '\\u003D'), |
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193 # ('-', '\\u002D'), |
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194 # (';', '\\u003B'), |
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195 (u'\u2028', '\\u2028'), |
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196 (u'\u2029', '\\u2029') |
| 18 | 197 ) |
| 198 | |
| 199 # Escape every ASCII character with a value less than 32. This is | |
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200 # needed a.o. to prevent html parsers from jumping out of javascript |
| 18 | 201 # parsing mode. |
| 202 _js_escapes = (_base_js_escapes + | |
| 203 tuple(('%c' % z, '\\u%04X' % z) for z in range(32))) | |
| 204 | |
| 205 @filter | |
| 206 def js_string_escape(value): | |
| 74 | 207 """ |
| 208 Javascript string literal escape. Note that this only escapes data | |
| 209 for embedding within javascript string literals, not in general | |
| 210 javascript snippets. | |
| 211 """ | |
| 18 | 212 |
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213 value = str(value) |
| 18 | 214 |
| 215 for bad, good in _js_escapes: | |
| 216 value = value.replace(bad, good) | |
| 217 | |
| 218 return value | |
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219 |
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220 @filter |
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221 def hits(result): |
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222 # sort hits by longest hotspot first |
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223 return sorted(result.Iteration_hits.findall('Hit'), |
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224 key=lambda h: max(blastxml_len(hsp) for hsp in h.Hit_hsps.Hsp), |
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225 reverse=True) |
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226 |
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227 |
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228 |
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229 class BlastVisualize: |
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230 |
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231 colors = ('black', 'blue', 'green', 'magenta', 'red') |
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232 |
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233 max_scale_labels = 10 |
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234 |
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235 def __init__(self, input, templatedir, templatename, genelinks={}): |
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236 self.input = input |
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237 self.templatename = templatename |
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238 self.genelinks = genelinks |
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239 |
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240 self.blast = objectify.parse(self.input).getroot() |
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241 self.loader = jinja2.FileSystemLoader(searchpath=templatedir) |
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242 self.environment = jinja2.Environment(loader=self.loader, |
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243 lstrip_blocks=True, trim_blocks=True, autoescape=True) |
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244 |
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245 self._addfilters(self.environment) |
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246 |
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247 |
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248 def _addfilters(self, environment): |
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249 for filtername, funcname in _filters.items(): |
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250 try: |
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251 environment.filters[filtername] = getattr(self, funcname) |
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252 except AttributeError: |
| 77 | 253 try: |
| 254 environment.filters[filtername] = globals()[funcname] | |
| 255 except KeyError: | |
| 256 environment.filters[filtername] = getattr(builtins, funcname) | |
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257 |
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258 def render(self, output): |
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259 template = self.environment.get_template(self.templatename) |
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260 |
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261 params = (('Query ID', self.blast["BlastOutput_query-ID"]), |
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262 ('Query definition', self.blast["BlastOutput_query-def"]), |
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263 ('Query length', self.blast["BlastOutput_query-len"]), |
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264 ('Program', self.blast.BlastOutput_version), |
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265 ('Database', self.blast.BlastOutput_db), |
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266 ) |
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267 |
| 107 | 268 result = template.stream(blast=self.blast, |
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269 iterations=self.blast.BlastOutput_iterations.Iteration, |
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270 colors=self.colors, |
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271 params=params) |
| 107 | 272 |
| 273 result.dump(output) | |
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274 |
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275 @filter |
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276 def match_colors(self, result): |
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277 """ |
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278 An iterator that yields lists of length-color pairs. |
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279 """ |
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280 |
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281 query_length = blastxml_len(result) |
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282 |
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283 percent_multiplier = 100 / query_length |
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284 |
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285 for hit in hits(result): |
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286 # sort hotspots from short to long, so we can overwrite index colors of |
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287 # short matches with those of long ones. |
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288 hotspots = sorted(hit.Hit_hsps.Hsp, key=lambda hsp: blastxml_len(hsp)) |
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289 table = bytearray([255]) * query_length |
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290 for hsp in hotspots: |
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291 frm = hsp['Hsp_query-from'] - 1 |
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292 to = int(hsp['Hsp_query-to']) |
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293 table[frm:to] = repeat(color_idx(blastxml_len(hsp)), to - frm) |
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294 |
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295 matches = [] |
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296 last = table[0] |
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297 count = 0 |
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298 for i in range(query_length): |
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299 if table[i] == last: |
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300 count += 1 |
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301 continue |
| 18 | 302 matches.append((count * percent_multiplier, self.colors[last] if last != 255 else 'transparent')) |
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303 last = table[i] |
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304 count = 1 |
| 18 | 305 matches.append((count * percent_multiplier, self.colors[last] if last != 255 else 'transparent')) |
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306 |
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307 yield dict(colors=matches, hit=hit, defline=firsttitle(hit)) |
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308 |
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309 @filter |
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310 def queryscale(self, result): |
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311 query_length = blastxml_len(result) |
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312 skip = math.ceil(query_length / self.max_scale_labels) |
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313 percent_multiplier = 100 / query_length |
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314 for i in range(1, query_length+1): |
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315 if i % skip == 0: |
| 25 | 316 yield dict(label = i, width = skip * percent_multiplier) |
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317 if query_length % skip != 0: |
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318 yield dict(label = query_length, |
| 25 | 319 width = (query_length % skip) * percent_multiplier) |
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320 |
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321 @filter |
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322 def hit_info(self, result): |
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323 |
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324 query_length = blastxml_len(result) |
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325 |
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326 for hit in hits(result): |
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327 hsps = hit.Hit_hsps.Hsp |
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328 |
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329 cover = [False] * query_length |
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330 for hsp in hsps: |
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331 cover[hsp['Hsp_query-from']-1 : int(hsp['Hsp_query-to'])] = repeat(True, blastxml_len(hsp)) |
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332 cover_count = cover.count(True) |
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333 |
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334 def hsp_val(path): |
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335 return (float(hsp[path]) for hsp in hsps) |
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336 |
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337 yield dict(hit = hit, |
| 77 | 338 title = firsttitle(hit), |
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339 maxscore = "{0:.1f}".format(max(hsp_val('Hsp_bit-score'))), |
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340 totalscore = "{0:.1f}".format(sum(hsp_val('Hsp_bit-score'))), |
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341 cover = "{0:.0%}".format(cover_count / query_length), |
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342 e_value = "{0:.4g}".format(min(hsp_val('Hsp_evalue'))), |
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343 # FIXME: is this the correct formula vv? |
| 80 | 344 # float(...) because non-flooring division doesn't work with lxml elements in python 2.6 |
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345 ident = "{0:.0%}".format(float(min(float(hsp.Hsp_identity) / blastxml_len(hsp) for hsp in hsps)))) |
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346 |
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347 @filter |
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348 def genelink(self, hit, text=None, clas=None, display_nolink=True): |
| 99 | 349 """Create a html link from a hit node to a configured gene bank webpage. |
| 350 text: The text of the link, defaults to the hit_id | |
| 351 clas: extra css classes that will be added to the <a> element | |
| 352 display_nolink: boolean, if false don't display anything if no link can be created. Default True. | |
| 353 """ | |
| 354 | |
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355 if text is None: |
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356 text = hitid(hit) |
| 99 | 357 |
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358 db = hit.getroottree().getroot().BlastOutput_db |
| 99 | 359 |
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360 if isinstance(self.genelinks, six.string_types): |
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361 template = self.genelinks |
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362 else: |
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363 template = self.genelinks.get(db) |
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364 if template is None: |
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365 return text if display_nolink else '' |
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366 args = dict(id=hitid(hit).split('|'), |
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367 fullid=hitid(hit), |
| 107 | 368 defline=str(hit.Hit_def).split(' ', 1)[0].split('|'), |
| 369 fulldefline=str(hit.Hit_def).split(' ', 1)[0], | |
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370 accession=str(hit.Hit_accession)) |
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371 try: |
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372 link = template.format(**args) |
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373 except Exception as e: |
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374 warnings.warn('Error in formatting gene bank link {} with {}: {}'.format(template, args, e)) |
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375 return text if display_nolink else '' |
| 99 | 376 |
|
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377 classattr = 'class="{0}" '.format(jinja2.escape(clas)) if clas is not None else '' |
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378 return jinja2.Markup("<a {0}href=\"{1}\">{2}</a>".format(classattr, jinja2.escape(link), jinja2.escape(text))) |
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379 |
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380 |
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381 def read_genelinks(dir): |
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382 links = {} |
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383 # blastdb.loc, blastdb_p.loc, blastdb_d.loc, etc. |
| 104 | 384 files = sorted(glob.glob(path.join(dir, 'blastdb*.loc'))) |
| 385 # reversed, so blastdb.loc will take precedence | |
| 386 for f in reversed(files): | |
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387 try: |
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388 f = open(path.join(dir, f)) |
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389 for l in f.readlines(): |
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390 if l.strip().startswith('#'): |
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391 continue |
|
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392 line = l.rstrip('\n').split('\t') |
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393 try: |
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394 links[line[2]] = line[3] |
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395 except IndexError: |
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396 continue |
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397 f.close() |
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398 except OSError: |
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399 continue |
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400 if not links: |
| 106 | 401 if not files: |
| 402 warnings.warn("No gene bank link templates found (no blastdb*.loc files found in {0})".format(dir)) | |
| 403 else: | |
| 404 warnings.warn("No gene bank link templates found in {0}".format(', '.join(files))) | |
|
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405 return links |
|
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406 |
|
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407 |
|
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408 def main(): |
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409 default_template = path.join(path.dirname(__file__), 'blast2html.html.jinja') |
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410 |
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411 parser = argparse.ArgumentParser(description="Convert a BLAST XML result into a nicely readable html page", |
| 108 | 412 usage="{0} [-i] INPUT [-o OUTPUT] [--genelink-template URL_TEMPLATE]".format(sys.argv[0])) |
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413 input_group = parser.add_mutually_exclusive_group(required=True) |
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414 input_group.add_argument('positional_arg', metavar='INPUT', nargs='?', type=argparse.FileType(mode='r'), |
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415 help='The input Blast XML file, same as -i/--input') |
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416 input_group.add_argument('-i', '--input', type=argparse.FileType(mode='r'), |
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417 help='The input Blast XML file') |
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418 parser.add_argument('-o', '--output', type=argparse.FileType(mode='w'), default=sys.stdout, |
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419 help='The output html file') |
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420 # We just want the file name here, so jinja can open the file |
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421 # itself. But it is easier to just use a FileType so argparse can |
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422 # handle the errors. This introduces a small race condition when |
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423 # jinja later tries to re-open the template file, but we don't |
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424 # care too much. |
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425 parser.add_argument('--template', type=argparse.FileType(mode='r'), default=default_template, |
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426 help='The template file to use. Defaults to blast_html.html.jinja') |
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427 |
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428 dblink_group = parser.add_mutually_exclusive_group() |
| 108 | 429 dblink_group.add_argument('--genelink-template', metavar='URL_TEMPLATE', |
| 430 default='http://www.ncbi.nlm.nih.gov/nucleotide/{accession}?report=genbank&log$=nuclalign', | |
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431 help="""A link template to link hits to a gene bank webpage. The template string is a |
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432 Python format string. It can contain the following replacement elements: {id[N]}, {fullid}, |
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433 {defline[N]}, {fulldefline}, {accession}, where N is a number. id[N] and defline[N] will be |
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434 replaced by the Nth element of the id or defline, where '|' is the field separator. |
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435 |
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436 The default is 'http://www.ncbi.nlm.nih.gov/nucleotide/{accession}?report=genbank&log$=nuclalign', |
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437 which is a link to the NCBI nucleotide database.""") |
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438 |
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439 dblink_group.add_argument('--db-config-dir', |
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440 help="""The directory where databases are configured in blastdb*.loc files. These files |
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441 are consulted for creating a gene bank link. The files should be tab-separated tables (with lines |
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442 starting with '#' ignored), where the third field of a line should be a database path and the fourth |
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443 a genebank link template conforming to the --genelink-template option syntax. |
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444 |
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445 This option is incompatible with --genelink-template.""") |
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446 |
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447 args = parser.parse_args() |
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448 if args.input == None: |
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449 args.input = args.positional_arg |
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450 if args.input == None: |
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451 parser.error('no input specified') |
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452 |
| 107 | 453 if six.PY2: |
| 454 # The argparse.FileType wrapper doesn't support an encoding | |
| 108 | 455 # argument, so for python 2 we need to wrap or reopen the |
| 456 # output. The input files are already read as utf-8 by the | |
| 107 | 457 # respective libraries. |
| 110 | 458 # |
| 107 | 459 # One option is using codecs, but the codecs' writelines() |
| 460 # method doesn't support streaming but collects all output and | |
| 108 | 461 # writes at once (see Python issues #5445 and #21910). On the |
| 462 # other hand the io module is slower (though not | |
| 463 # significantly). | |
| 107 | 464 |
| 465 # args.output = codecs.getwriter('utf-8')(args.output) | |
| 110 | 466 # def fixed_writelines(iter, self=args.output): |
| 467 # for i in iter: | |
| 468 # self.write(i) | |
| 469 # args.output.writelines = fixed_writelines | |
| 470 | |
| 471 args.output.close() | |
| 107 | 472 args.output = io.open(args.output.name, 'w') |
| 473 | |
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474 templatedir, templatename = path.split(args.template.name) |
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475 args.template.close() |
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476 if not templatedir: |
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477 templatedir = '.' |
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478 |
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479 if args.db_config_dir is None: |
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480 genelinks = args.genelink_template |
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481 elif not path.isdir(args.db_config_dir): |
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482 parser.error('db-config-dir does not exist or is not a directory') |
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483 else: |
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484 genelinks = read_genelinks(args.db_config_dir) |
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485 |
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486 b = BlastVisualize(args.input, templatedir, templatename, genelinks) |
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487 b.render(args.output) |
| 107 | 488 args.output.close() |
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489 |
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490 |
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491 if __name__ == '__main__': |
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492 main() |
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493 |