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annotate roundup/msgfmt.py @ 7788:a9bac0cb4019

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feat: make msgfmt.py a simple CLI replacement for msgfmt(1) Simplify testing .po files if the tester doesn't have access to GNU gettest tools or doesn't want to install the python Babel package. Also mentioned in developers.txt.
author John Rouillard <rouilj@ieee.org>
date Wed, 06 Mar 2024 13:12:21 -0500
parents 6a1c1cd69582
children 37a98ec62e2e
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 import codecs
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36 import struct
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37 import sys
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38 from ast import literal_eval
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39 from email.parser import HeaderParser
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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: F821
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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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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, label, 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 label = context + u'\x04' + label
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111 if not label:
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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[label] = 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 labels = strs = b''
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129 for label in keys:
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130 msg = self.messages[label].encode(self.encoding)
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131 label = label.encode(self.encoding)
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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(labels), len(label), len(strs),
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135 len(msg)))
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136 labels += label + b'\0'
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137 strs += msg + b'\0'
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138 output = b''
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139 # The header is 7 32-bit unsigned integers. We don't use hash tables,
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140 # so the keys start right after the index tables.
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141 keystart = 7 * 4 + 16 * len(keys)
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142 # and the values start after the keys
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143 valuestart = keystart + len(labels)
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144 koffsets = []
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145 voffsets = []
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146 # The string table first has the list of keys, then the list of values.
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147 # Each entry has first the size of the string, then the file offset.
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148 for o1, l1, o2, l2 in offsets:
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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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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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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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160 7 * 4 + len(keys) * 8, # start of value index
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161 0, keystart) # size and offset of hash table
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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 += labels
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167 output += strs
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168 return output
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169
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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
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186 # Parse the catalog
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187 # ruff: noqa: E741 PLW2901 - 'l' var name ok; overwrite 'l' ok
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188 lno = 0
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189 for l in self.readPoData():
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190 l = l.decode(self.encoding)
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191 lno += 1
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192 # If we get a comment line after a msgstr or a line starting with
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193 # msgid or msgctxt, this is a new entry
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194 if section == STR and (l[0] == '#' or (l[0] == 'm' and
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195 (l.startswith('msgctxt') or l.startswith('msgid')))):
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196 self.add(msgctxt, msgid, msgstr, fuzzy)
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197 section = None
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198 fuzzy = 0
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199 # If we only want the header we stop after the first message
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200 if header_only:
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201 break
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202 # Record a fuzzy mark
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203 if l[:2] == '#,' and 'fuzzy' in l:
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204 fuzzy = 1
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205 # Skip comments
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206 if l[0] == '#':
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207 continue
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208 # Now we are in a msgctxt section
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209 if l.startswith('msgctxt'):
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210 section = CTXT
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211 l = l[7:]
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212 msgctxt = u''
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213 # Now we are in a msgid section, output previous section
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214 elif (l.startswith('msgid') and
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215 not l.startswith('msgid_plural')):
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216 if section == STR:
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217 self.add(msgid, msgstr, fuzzy)
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218 section = ID
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219 l = l[5:]
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220 msgid = msgstr = u''
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221 is_plural = False
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222 # This is a message with plural forms
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223 elif l.startswith('msgid_plural'):
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224 if section != ID:
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225 raise PoSyntaxError(
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226 'msgid_plural not preceeded by '
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227 'msgid on line %d of po file %s' %
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228 (lno, repr(self.name)))
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229 l = l[12:]
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230 msgid += u'\0' # separator of singular and plural
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231 is_plural = True
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232 # Now we are in a msgstr section
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233 elif l.startswith('msgstr'):
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234 section = STR
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235 if l.startswith('msgstr['):
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236 if not is_plural:
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237 raise PoSyntaxError(
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238 'plural without msgid_plural '
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239 'on line %d of po file %s' %
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240 (lno, repr(self.name)))
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241 l = l.split(']', 1)[1]
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242 if msgstr:
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243 # Separator of the various plural forms
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244 msgstr += u'\0'
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245 else:
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246 if is_plural:
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diff changeset
247 raise PoSyntaxError(
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diff changeset
248 'indexed msgstr required for '
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249 'plural on line %d of po file %s' %
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diff changeset
250 (lno, repr(self.name)))
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251 l = l[6:]
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diff changeset
252 # Skip empty lines
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253 l = l.strip()
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diff changeset
254 if not l:
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diff changeset
255 continue
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diff changeset
256 # TODO: Does this always follow Python escape semantics?
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diff changeset
257 try:
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diff changeset
258 l = literal_eval(l)
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diff changeset
259 except Exception as msg:
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260 raise PoSyntaxError(
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261 '%s (line %d of po file %s): \n%s' %
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262 (msg, lno, repr(self.name), l))
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263 if isinstance(l, bytes):
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264 l = l.decode(self.encoding)
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265 if section == CTXT:
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266 msgctxt += l
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267 elif section == ID:
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268 msgid += l
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269 elif section == STR:
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270 msgstr += l
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271 else:
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272 raise PoSyntaxError(
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273 'error on line %d of po file %s' %
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274 (lno, repr(self.name)))
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275
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276 # Add last entry
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277 if section == STR:
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278 self.add(msgctxt, msgid, msgstr, fuzzy)
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279
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280 if self.openfile:
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281 self.po.close()
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282
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283 def getAsFile(self):
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284 return BytesIO(self.get())
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285
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286
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287 if __name__ == '__main__':
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288 # a really dumb attempt to make this into a command
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289 # Usage: python msgfmy.py <input_file>.po <output_file>.mo
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290 import sys
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291
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292 mo = Msgfmt(sys.argv[1]).get()
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293 with open(sys.argv[2], 'wb') as mofile:
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294 mofile.write(mo)
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295 mofile.close()
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296
Roundup Issue Tracker: http://roundup-tracker.org/