Mercurial > repos > jankanis > blast2html
annotate blast2html.py @ 119:591dc9c24824
tentative fix for Rikilt issue 10: don't sort hits ourselves but use blastxml ordering
| author | Jan Kanis <jan.code@jankanis.nl> |
|---|---|
| date | Thu, 31 Jul 2014 13:26:34 +0200 |
| parents | 7f3f8c10f44b |
| children | 2729c2326235 |
| rev | line source |
|---|---|
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1 #!/usr/bin/env python3 |
| 50 | 2 # -*- coding: utf-8 -*- |
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3 |
| 75 | 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 |
| 72 | 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 |
| 50 | 10 |
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11 import sys |
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12 import math |
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13 import warnings |
| 104 | 14 import six, codecs, io |
| 75 | 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, namedtuple |
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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): |
| 96 | 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.""" |
| 96 | 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""" |
| 71 | 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']) |
| 69 | 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']) |
| 69 | 107 hframe = int(hsp['Hsp_hit-frame']) |
| 71 | 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 |
| 69 | 112 |
| 71 | 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)) |
| 69 | 115 qframe = -1 if qframe < 0 else 1 |
| 71 | 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)) |
| 69 | 118 hframe = -1 if hframe < 0 else 1 |
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119 |
| 69 | 120 def split(txt): |
| 71 | 121 return [txt[i:i+linewidth] for i in range(0, len(txt), linewidth)] |
| 69 | 122 |
| 71 | 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 |
| 69 | 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))) |
| 69 | 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 |
| 16 | 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 |
| 16 | 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') |
| 16 | 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 |
| 16 | 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): | |
| 72 | 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 """ | |
| 16 | 212 |
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213 value = str(value) |
| 16 | 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 # Use findall so we get an empty list if there are no Hit elements at all |
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223 return result.Iteration_hits.findall('Hit') |
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224 |
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225 @filter('params') |
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226 def result_params(iteration): |
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227 return (('Query number', iteration['Iteration_iter-num']), |
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228 ('Query ID', iteration['Iteration_query-ID']), |
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229 ('Definition line', iteration['Iteration_query-def']), |
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230 ('Length', blastxml_len(iteration))) |
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231 |
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232 |
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233 class BlastVisualize: |
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234 |
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235 colors = ('black', 'blue', 'green', 'magenta', 'red') |
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236 |
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237 max_scale_labels = 10 |
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238 |
| 116 | 239 def __init__(self, input, templatedir, templatename, genelinks): |
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240 self.input = input |
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241 self.templatename = templatename |
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242 self.genelinks = genelinks |
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243 |
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244 self.blast = objectify.parse(self.input).getroot() |
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245 self.loader = jinja2.FileSystemLoader(searchpath=templatedir) |
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246 self.environment = jinja2.Environment(loader=self.loader, |
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247 lstrip_blocks=True, trim_blocks=True, autoescape=True) |
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248 |
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249 self._addfilters(self.environment) |
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250 |
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251 |
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252 def _addfilters(self, environment): |
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253 for filtername, funcname in _filters.items(): |
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254 try: |
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255 environment.filters[filtername] = getattr(self, funcname) |
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256 except AttributeError: |
| 75 | 257 try: |
| 258 environment.filters[filtername] = globals()[funcname] | |
| 259 except KeyError: | |
| 260 environment.filters[filtername] = getattr(builtins, funcname) | |
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261 |
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262 def render(self, output): |
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263 template = self.environment.get_template(self.templatename) |
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264 |
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265 params = (('Program', self.blast.BlastOutput_version), |
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266 ('Database', self.blast.BlastOutput_db), |
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267 ) |
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268 |
| 104 | 269 result = template.stream(blast=self.blast, |
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270 iterations=self.blast.BlastOutput_iterations.Iteration, |
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271 colors=self.colors, |
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272 params=params) |
| 104 | 273 |
| 274 result.dump(output) | |
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275 |
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276 @filter |
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277 def match_colors(self, result): |
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278 """ |
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279 An iterator that yields lists of length-color pairs. |
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280 """ |
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281 |
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282 query_length = blastxml_len(result) |
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283 |
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284 percent_multiplier = 100 / query_length |
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285 |
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286 for hit in hits(result): |
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287 # sort hotspots from short to long, so we can overwrite index colors of |
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288 # short matches with those of long ones. |
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289 hotspots = sorted(hit.Hit_hsps.Hsp, key=lambda hsp: blastxml_len(hsp)) |
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290 table = bytearray([255]) * query_length |
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291 for hsp in hotspots: |
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292 frm = hsp['Hsp_query-from'] - 1 |
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293 to = int(hsp['Hsp_query-to']) |
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294 table[frm:to] = repeat(color_idx(blastxml_len(hsp)), to - frm) |
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295 |
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296 matches = [] |
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297 last = table[0] |
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298 count = 0 |
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299 for i in range(query_length): |
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300 if table[i] == last: |
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301 count += 1 |
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302 continue |
| 16 | 303 matches.append((count * percent_multiplier, self.colors[last] if last != 255 else 'transparent')) |
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304 last = table[i] |
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305 count = 1 |
| 16 | 306 matches.append((count * percent_multiplier, self.colors[last] if last != 255 else 'transparent')) |
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307 |
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308 yield dict(colors=matches, hit=hit, defline=firsttitle(hit)) |
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309 |
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310 @filter |
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311 def queryscale(self, result): |
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312 query_length = blastxml_len(result) |
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313 skip = math.ceil(query_length / self.max_scale_labels) |
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314 percent_multiplier = 100 / query_length |
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315 for i in range(1, query_length+1): |
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316 if i % skip == 0: |
| 23 | 317 yield dict(label = i, width = skip * percent_multiplier) |
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318 if query_length % skip != 0: |
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319 yield dict(label = query_length, |
| 23 | 320 width = (query_length % skip) * percent_multiplier) |
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321 |
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322 @filter |
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323 def hit_info(self, result): |
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324 |
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325 query_length = blastxml_len(result) |
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326 |
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327 for hit in hits(result): |
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328 hsps = hit.Hit_hsps.Hsp |
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329 |
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330 cover = [False] * query_length |
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331 for hsp in hsps: |
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332 cover[hsp['Hsp_query-from']-1 : int(hsp['Hsp_query-to'])] = repeat(True, blastxml_len(hsp)) |
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333 cover_count = cover.count(True) |
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334 |
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335 def hsp_val(path): |
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336 return (float(hsp[path]) for hsp in hsps) |
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337 |
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338 yield dict(hit = hit, |
| 75 | 339 title = firsttitle(hit), |
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340 maxscore = "{0:.1f}".format(max(hsp_val('Hsp_bit-score'))), |
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341 totalscore = "{0:.1f}".format(sum(hsp_val('Hsp_bit-score'))), |
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342 cover = "{0:.0%}".format(cover_count / query_length), |
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343 e_value = "{0:.4}".format(float(min(hsp_val('Hsp_evalue')))), |
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344 # FIXME: is this the correct formula vv? |
| 78 | 345 # float(...) because non-flooring division doesn't work with lxml elements in python 2.6 |
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346 ident = "{0:.0%}".format(float(min(float(hsp.Hsp_identity) / blastxml_len(hsp) for hsp in hsps)))) |
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347 |
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348 @filter |
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349 def genelink(self, hit, text=None, text_from='hitid', cssclass=None, display_nolink=True): |
| 96 | 350 """Create a html link from a hit node to a configured gene bank webpage. |
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351 text: The text of the link. If not set applies text_from. |
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352 text_from: string, if text is not specified, take it from specified source. Either 'hitid' (default) or 'dbname'. |
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353 cssclass: extra css classes that will be added to the <a> element |
| 96 | 354 display_nolink: boolean, if false don't display anything if no link can be created. Default True. |
| 355 """ | |
| 356 | |
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357 db = hit.getroottree().getroot().BlastOutput_db |
| 96 | 358 |
| 116 | 359 template = self.genelinks[db].template |
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360 |
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361 if text is None: |
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362 if text_from == 'hitid': |
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363 text = hitid(hit) |
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364 elif text_from == 'dbname': |
| 116 | 365 text = self.genelinks[db].dbname |
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366 else: |
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367 raise ValueError("Unknown value for text_from: '{0}'. Use 'hitid' or 'dbname'.".format(text_from)) |
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368 |
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369 if template is None: |
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370 return text if display_nolink else '' |
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371 |
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372 args = dict(id=hitid(hit).split('|'), |
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373 fullid=hitid(hit), |
| 104 | 374 defline=str(hit.Hit_def).split(' ', 1)[0].split('|'), |
| 375 fulldefline=str(hit.Hit_def).split(' ', 1)[0], | |
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376 accession=str(hit.Hit_accession)) |
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377 try: |
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378 link = template.format(**args) |
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379 except Exception as e: |
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380 warnings.warn('Error in formatting gene bank link {} with {}: {}'.format(template, args, e)) |
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381 return text if display_nolink else '' |
| 96 | 382 |
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383 classattr = 'class="{0}" '.format(jinja2.escape(cssclass)) if cssclass is not None else '' |
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384 return jinja2.Markup("<a {0}target=\"_top\" href=\"{1}\">{2}</a>".format(classattr, jinja2.escape(link), jinja2.escape(text))) |
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385 |
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386 |
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387 genelinks_entry = namedtuple('genelinks_entry', 'dbname template') |
| 116 | 388 def read_blastdb(dir, default): |
| 389 links = defaultdict(lambda: default) | |
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390 # blastdb.loc, blastdb_p.loc, blastdb_d.loc, etc. |
| 101 | 391 files = sorted(glob.glob(path.join(dir, 'blastdb*.loc'))) |
| 392 # reversed, so blastdb.loc will take precedence | |
| 393 for f in reversed(files): | |
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394 try: |
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395 f = open(path.join(dir, f)) |
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396 for l in f.readlines(): |
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397 if l.strip().startswith('#'): |
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398 continue |
|
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399 line = l.rstrip('\n').split('\t') |
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400 try: |
| 116 | 401 links[line[2]] = genelinks_entry(dbname=line[3] or default.dbname, template=line[4]) |
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402 except IndexError: |
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403 continue |
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404 f.close() |
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405 except OSError: |
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406 continue |
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407 if not links: |
| 103 | 408 if not files: |
| 409 warnings.warn("No gene bank link templates found (no blastdb*.loc files found in {0})".format(dir)) | |
| 410 else: | |
| 411 warnings.warn("No gene bank link templates found in {0}".format(', '.join(files))) | |
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412 return links |
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413 |
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414 |
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415 def main(): |
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416 default_template = path.join(path.dirname(__file__), 'blast2html.html.jinja') |
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417 |
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418 parser = argparse.ArgumentParser(description="Convert a BLAST XML result into a nicely readable html page", |
| 116 | 419 usage="{0} [-i] INPUT [-o OUTPUT] [--genelink-template URL_TEMPLATE] [--dbname DBNAME]".format(sys.argv[0])) |
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420 input_group = parser.add_mutually_exclusive_group(required=True) |
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421 input_group.add_argument('positional_arg', metavar='INPUT', nargs='?', type=argparse.FileType(mode='r'), |
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422 help='The input Blast XML file, same as -i/--input') |
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423 input_group.add_argument('-i', '--input', type=argparse.FileType(mode='r'), |
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424 help='The input Blast XML file') |
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425 parser.add_argument('-o', '--output', type=argparse.FileType(mode='w'), default=sys.stdout, |
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426 help='The output html file') |
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427 # We just want the file name here, so jinja can open the file |
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428 # itself. But it is easier to just use a FileType so argparse can |
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429 # handle the errors. This introduces a small race condition when |
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430 # jinja later tries to re-open the template file, but we don't |
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431 # care too much. |
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432 parser.add_argument('--template', type=argparse.FileType(mode='r'), default=default_template, |
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433 help='The template file to use. Defaults to blast_html.html.jinja') |
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434 |
| 116 | 435 parser.add_argument('--dbname', type=str, default='Gene Bank', |
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436 help="The link text to use for external links to a gene bank database. Defaults to 'Gene Bank'") |
| 116 | 437 parser.add_argument('--genelink-template', metavar='URL_TEMPLATE', |
| 438 default='http://www.ncbi.nlm.nih.gov/nucleotide/{accession}?report=genbank&log$=nuclalign', | |
| 439 help="""A link template to link hits to a gene bank webpage. The template string is a | |
| 440 Python format string. It can contain the following replacement elements: {id[N]}, {fullid}, | |
| 441 {defline[N]}, {fulldefline}, {accession}, where N is a number. id[N] and defline[N] will be | |
| 442 replaced by the Nth element of the id or defline, where '|' is the field separator. | |
| 443 | |
| 444 The default is 'http://www.ncbi.nlm.nih.gov/nucleotide/{accession}?report=genbank&log$=nuclalign', | |
| 445 which is a link to the NCBI nucleotide database.""") | |
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446 |
| 116 | 447 parser.add_argument('--db-config-dir', |
| 448 help="""The directory where databases are configured in blastdb*.loc files. These files | |
| 449 are consulted for creating a gene bank link. The files should conform to the format that | |
| 450 Galaxy's BLAST expect, i.e. tab-separated tables (with lines starting with '#' ignored), | |
| 451 with two extra fields. The third field of a line should be a database path and the fourth | |
| 452 a genebank link template conforming to the --genelink-template option syntax. Entries in | |
| 453 these config files override links specified using --genelink-template and --dbname.""") | |
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454 |
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455 args = parser.parse_args() |
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456 if args.input == None: |
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457 args.input = args.positional_arg |
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458 if args.input == None: |
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459 parser.error('no input specified') |
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460 |
| 104 | 461 if six.PY2: |
| 462 # The argparse.FileType wrapper doesn't support an encoding | |
| 105 | 463 # argument, so for python 2 we need to wrap or reopen the |
| 464 # output. The input files are already read as utf-8 by the | |
| 104 | 465 # respective libraries. |
| 107 | 466 # |
| 104 | 467 # One option is using codecs, but the codecs' writelines() |
| 468 # method doesn't support streaming but collects all output and | |
| 105 | 469 # writes at once (see Python issues #5445 and #21910). On the |
| 470 # other hand the io module is slower (though not | |
| 471 # significantly). | |
| 104 | 472 |
| 473 # args.output = codecs.getwriter('utf-8')(args.output) | |
| 107 | 474 # def fixed_writelines(iter, self=args.output): |
| 475 # for i in iter: | |
| 476 # self.write(i) | |
| 477 # args.output.writelines = fixed_writelines | |
| 478 | |
| 479 args.output.close() | |
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480 args.output = io.open(args.output.name, 'w', encoding='utf-8') |
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481 |
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482 templatedir, templatename = path.split(args.template.name) |
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483 args.template.close() |
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484 if not templatedir: |
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485 templatedir = '.' |
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486 |
| 116 | 487 defaultentry = genelinks_entry(args.dbname, args.genelink_template) |
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488 if args.db_config_dir is None: |
| 116 | 489 genelinks = defaultdict(lambda: defaultentry) |
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490 elif not path.isdir(args.db_config_dir): |
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491 parser.error('db-config-dir does not exist or is not a directory') |
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492 else: |
| 116 | 493 genelinks = read_blastdb(args.db_config_dir, default=defaultentry) |
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494 |
| 116 | 495 b = BlastVisualize(args.input, templatedir, templatename, genelinks=genelinks) |
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496 b.render(args.output) |
| 104 | 497 args.output.close() |
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498 |
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499 |
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500 if __name__ == '__main__': |
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501 main() |
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502 |