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annotate roundup/msgfmt.py @ 6539:f8df7fed18f6

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issue2551175 - Make ETag content-encoding aware. HTTP ETag headers now include a suffix (-gzip, -br, -zstd) indicating the content-encoding used to send the data per rfc7232. Validate any form of ETag by stripping a suffix (if present).
author John Rouillard <rouilj@ieee.org>
date Wed, 01 Dec 2021 19:52:54 -0500
parents 4d2e1fa03f0f
children 6a1c1cd69582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #! /usr/bin/env python
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2 # -*- coding: iso-8859-1 -*-
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3 # Written by Martin v. Loewis <loewis@informatik.hu-berlin.de>
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4 #
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5 # Changed by Christian 'Tiran' Heimes <tiran@cheimes.de> for the placeless
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6 # translation service (PTS) of Zope
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7 #
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8 # Fixed some bugs and updated to support msgctxt
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9 # by Hanno Schlichting <hanno@hannosch.eu>
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10
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11 """Generate binary message catalog from textual translation description.
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12
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13 This program converts a textual Uniforum-style message catalog (.po file) into
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14 a binary GNU catalog (.mo file). This is essentially the same function as the
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15 GNU msgfmt program, however, it is a simpler implementation.
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16
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17 This file was taken from Python-2.3.2/Tools/i18n and altered in several ways.
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18 Now you can simply use it from another python module:
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19
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20 from msgfmt import Msgfmt
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21 mo = Msgfmt(po).get()
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22
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23 where po is path to a po file as string, an opened po file ready for reading or
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24 a list of strings (readlines of a po file) and mo is the compiled mo file as
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25 binary string.
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26
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27 Exceptions:
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28
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29 * IOError if the file couldn't be read
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30
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31 * msgfmt.PoSyntaxError if the po file has syntax errors
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32 """
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33
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34 import array
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35 from ast import literal_eval
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36 import codecs
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37 from email.parser import HeaderParser
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38 import struct
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39 import sys
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40
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41 PY3 = sys.version_info[0] == 3
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42 if PY3:
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43 def header_charset(s):
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44 p = HeaderParser()
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45 return p.parsestr(s).get_content_charset()
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46
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47 import io
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48 BytesIO = io.BytesIO
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49 FILE_TYPE = io.IOBase
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50 else:
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51 def header_charset(s):
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52 p = HeaderParser()
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53 return p.parsestr(s.encode('utf-8', 'ignore')).get_content_charset()
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54
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55 from cStringIO import StringIO as BytesIO
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56 # file is a type defined only under python 2.
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57 # Flake8 when run in py3 flags this.
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58 FILE_TYPE = file # noqa: 821
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60
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61 class PoSyntaxError(Exception):
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62 """ Syntax error in a po file """
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63
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64 def __init__(self, msg):
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65 self.msg = msg
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66
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67 def __str__(self):
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68 return 'Po file syntax error: %s' % self.msg
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69
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70
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71 class Msgfmt:
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72
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73 def __init__(self, po, name='unknown'):
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74 self.po = po
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75 self.name = name
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76 self.messages = {}
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77 self.openfile = False
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78 # Start off assuming latin-1, so everything decodes without failure,
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79 # until we know the exact encoding
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80 self.encoding = 'latin-1'
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81
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82 def readPoData(self):
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83 """ read po data from self.po and return an iterator """
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84 output = []
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85 if isinstance(self.po, str):
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86 output = open(self.po, 'rb')
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87 elif isinstance(self.po, FILE_TYPE):
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88 self.po.seek(0)
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89 self.openfile = True
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90 output = self.po
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91 elif isinstance(self.po, list):
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92 output = self.po
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93 if not output:
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94 raise ValueError("self.po is invalid! %s" % type(self.po))
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95 if isinstance(output, FILE_TYPE):
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96 # remove BOM from the start of the parsed input
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97 first = output.readline()
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98 if len(first) == 0:
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99 return output.readlines()
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100 if first.startswith(codecs.BOM_UTF8):
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101 first = first.lstrip(codecs.BOM_UTF8)
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102 return [first] + output.readlines()
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103 return output
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104
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105 def add(self, context, id, string, fuzzy):
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106 "Add a non-empty and non-fuzzy translation to the dictionary."
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107 if string and not fuzzy:
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108 # The context is put before the id and separated by a EOT char.
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109 if context:
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110 id = context + u'\x04' + id
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111 if not id:
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112 # See whether there is an encoding declaration
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113 charset = header_charset(string)
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114 if charset:
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115 # decode header in proper encoding
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116 string = string.encode(self.encoding).decode(charset)
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117 if not PY3:
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118 # undo damage done by literal_eval in Python 2.x
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119 string = string.encode(self.encoding).decode(charset)
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120 self.encoding = charset
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121 self.messages[id] = string
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122
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123 def generate(self):
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124 "Return the generated output."
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125 # the keys are sorted in the .mo file
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126 keys = sorted(self.messages.keys())
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127 offsets = []
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128 ids = strs = b''
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129 for id in keys:
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130 msg = self.messages[id].encode(self.encoding)
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diff changeset
131 id = id.encode(self.encoding)
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diff changeset
132 # For each string, we need size and file offset. Each string is
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133 # NUL terminated; the NUL does not count into the size.
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134 offsets.append((len(ids), len(id), len(strs),
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diff changeset
135 len(msg)))
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diff changeset
136 ids += id + b'\0'
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137 strs += msg + b'\0'
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138 output = b''
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diff changeset
139 # The header is 7 32-bit unsigned integers. We don't use hash tables,
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diff changeset
140 # so the keys start right after the index tables.
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diff changeset
141 keystart = 7 * 4 + 16 * len(keys)
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diff changeset
142 # and the values start after the keys
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diff changeset
143 valuestart = keystart + len(ids)
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diff changeset
144 koffsets = []
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diff changeset
145 voffsets = []
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diff changeset
146 # The string table first has the list of keys, then the list of values.
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diff changeset
147 # Each entry has first the size of the string, then the file offset.
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diff changeset
148 for o1, l1, o2, l2 in offsets:
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diff changeset
149 koffsets += [l1, o1 + keystart]
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150 voffsets += [l2, o2 + valuestart]
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151 offsets = koffsets + voffsets
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diff changeset
152 # Even though we don't use a hashtable, we still set its offset to be
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153 # binary compatible with the gnu gettext format produced by:
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154 # msgfmt file.po --no-hash
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diff changeset
155 output = struct.pack("Iiiiiii",
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156 0x950412de, # Magic
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157 0, # Version
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158 len(keys), # # of entries
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159 7 * 4, # start of key index
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diff changeset
160 7 * 4 + len(keys) * 8, # start of value index
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diff changeset
161 0, keystart) # size and offset of hash table
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diff changeset
162 if PY3:
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163 output += array.array("i", offsets).tobytes()
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164 else:
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165 output += array.array("i", offsets).tostring()
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166 output += ids
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167 output += strs
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168 return output
2784
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169
5450
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170 def get(self):
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171 """ """
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172 self.read()
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173 # Compute output
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174 return self.generate()
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175
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176 def read(self, header_only=False):
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177 """ """
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178 ID = 1
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179 STR = 2
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180 CTXT = 3
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181
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182 section = None
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183 fuzzy = 0
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184 msgid = msgstr = msgctxt = u''
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185
5450
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186 # Parse the catalog
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187 lno = 0
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188 for l in self.readPoData():
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189 l = l.decode(self.encoding)
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190 lno += 1
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191 # If we get a comment line after a msgstr or a line starting with
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192 # msgid or msgctxt, this is a new entry
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193 if section == STR and (l[0] == '#' or (l[0] == 'm' and
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diff changeset
194 (l.startswith('msgctxt') or l.startswith('msgid')))):
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diff changeset
195 self.add(msgctxt, msgid, msgstr, fuzzy)
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196 section = None
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197 fuzzy = 0
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198 # If we only want the header we stop after the first message
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199 if header_only:
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diff changeset
200 break
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diff changeset
201 # Record a fuzzy mark
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diff changeset
202 if l[:2] == '#,' and 'fuzzy' in l:
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203 fuzzy = 1
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diff changeset
204 # Skip comments
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Christof Meerwald <cmeerw@cmeerw.org>
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diff changeset
205 if l[0] == '#':
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diff changeset
206 continue
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diff changeset
207 # Now we are in a msgctxt section
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diff changeset
208 if l.startswith('msgctxt'):
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parents: 5395
diff changeset
209 section = CTXT
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diff changeset
210 l = l[7:]
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diff changeset
211 msgctxt = u''
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diff changeset
212 # Now we are in a msgid section, output previous section
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diff changeset
213 elif (l.startswith('msgid') and
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parents: 5395
diff changeset
214 not l.startswith('msgid_plural')):
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parents: 5395
diff changeset
215 if section == STR:
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Christof Meerwald <cmeerw@cmeerw.org>
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diff changeset
216 self.add(msgid, msgstr, fuzzy)
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diff changeset
217 section = ID
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diff changeset
218 l = l[5:]
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parents: 5395
diff changeset
219 msgid = msgstr = u''
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
220 is_plural = False
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
221 # This is a message with plural forms
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
222 elif l.startswith('msgid_plural'):
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
223 if section != ID:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
224 raise PoSyntaxError(
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
225 'msgid_plural not preceeded by '
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
226 'msgid on line %d of po file %s' %
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parents: 5395
diff changeset
227 (lno, repr(self.name)))
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diff changeset
228 l = l[12:]
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diff changeset
229 msgid += u'\0' # separator of singular and plural
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diff changeset
230 is_plural = True
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diff changeset
231 # Now we are in a msgstr section
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diff changeset
232 elif l.startswith('msgstr'):
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parents: 5395
diff changeset
233 section = STR
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
234 if l.startswith('msgstr['):
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
235 if not is_plural:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
236 raise PoSyntaxError(
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
237 'plural without msgid_plural '
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parents: 5395
diff changeset
238 'on line %d of po file %s' %
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parents: 5395
diff changeset
239 (lno, repr(self.name)))
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parents: 5395
diff changeset
240 l = l.split(']', 1)[1]
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
241 if msgstr:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
242 # Separator of the various plural forms
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
243 msgstr += u'\0'
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
244 else:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
245 if is_plural:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
246 raise PoSyntaxError(
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
247 'indexed msgstr required for '
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parents: 5395
diff changeset
248 'plural on line %d of po file %s' %
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
249 (lno, repr(self.name)))
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diff changeset
250 l = l[6:]
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
251 # Skip empty lines
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Christof Meerwald <cmeerw@cmeerw.org>
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diff changeset
252 l = l.strip()
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
253 if not l:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
254 continue
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parents: 5395
diff changeset
255 # TODO: Does this always follow Python escape semantics?
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diff changeset
256 try:
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parents: 5395
diff changeset
257 l = literal_eval(l)
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
258 except Exception as msg:
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
259 raise PoSyntaxError(
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Christof Meerwald <cmeerw@cmeerw.org>
parents: 5395
diff changeset
260 '%s (line %d of po file %s): \n%s' %
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Christof Meerwald <cmeerw@cmeerw.org>
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261 (msg, lno, repr(self.name), l))
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262 if isinstance(l, bytes):
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263 l = l.decode(self.encoding)
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264 if section == CTXT:
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265 msgctxt += l
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266 elif section == ID:
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267 msgid += l
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268 elif section == STR:
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269 msgstr += l
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270 else:
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271 raise PoSyntaxError(
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272 'error on line %d of po file %s' %
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273 (lno, repr(self.name)))
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274
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275 # Add last entry
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276 if section == STR:
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277 self.add(msgctxt, msgid, msgstr, fuzzy)
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278
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279 if self.openfile:
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280 self.po.close()
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281
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282 def getAsFile(self):
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283 return BytesIO(self.get())
Roundup Issue Tracker: http://roundup-tracker.org/