Current File : //usr/lib/python2.7/site-packages/babel/messages/extract.py
# -*- coding: utf-8 -*-
#
# Copyright (C) 2007 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://babel.edgewall.org/wiki/License.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://babel.edgewall.org/log/.
"""Basic infrastructure for extracting localizable messages from source files.
This module defines an extensible system for collecting localizable message
strings from a variety of sources. A native extractor for Python source files
is builtin, extractors for other sources can be added using very simple plugins.
The main entry points into the extraction functionality are the functions
`extract_from_dir` and `extract_from_file`.
"""
import os
try:
set
except NameError:
from sets import Set as set
import sys
from tokenize import generate_tokens, COMMENT, NAME, OP, STRING
from babel.util import parse_encoding, pathmatch, relpath
from textwrap import dedent
__all__ = ['extract', 'extract_from_dir', 'extract_from_file']
__docformat__ = 'restructuredtext en'
GROUP_NAME = 'babel.extractors'
DEFAULT_KEYWORDS = {
'_': None,
'gettext': None,
'ngettext': (1, 2),
'ugettext': None,
'ungettext': (1, 2),
'dgettext': (2,),
'dngettext': (2, 3),
'N_': None
}
DEFAULT_MAPPING = [('**.py', 'python')]
empty_msgid_warning = (
'%s: warning: Empty msgid. It is reserved by GNU gettext: gettext("") '
'returns the header entry with meta information, not the empty string.')
def _strip_comment_tags(comments, tags):
"""Helper function for `extract` that strips comment tags from strings
in a list of comment lines. This functions operates in-place.
"""
def _strip(line):
for tag in tags:
if line.startswith(tag):
return line[len(tag):].strip()
return line
comments[:] = map(_strip, comments)
def extract_from_dir(dirname=os.getcwd(), method_map=DEFAULT_MAPPING,
options_map=None, keywords=DEFAULT_KEYWORDS,
comment_tags=(), callback=None, strip_comment_tags=False):
"""Extract messages from any source files found in the given directory.
This function generates tuples of the form:
``(filename, lineno, message, comments)``
Which extraction method is used per file is determined by the `method_map`
parameter, which maps extended glob patterns to extraction method names.
For example, the following is the default mapping:
>>> method_map = [
... ('**.py', 'python')
... ]
This basically says that files with the filename extension ".py" at any
level inside the directory should be processed by the "python" extraction
method. Files that don't match any of the mapping patterns are ignored. See
the documentation of the `pathmatch` function for details on the pattern
syntax.
The following extended mapping would also use the "genshi" extraction
method on any file in "templates" subdirectory:
>>> method_map = [
... ('**/templates/**.*', 'genshi'),
... ('**.py', 'python')
... ]
The dictionary provided by the optional `options_map` parameter augments
these mappings. It uses extended glob patterns as keys, and the values are
dictionaries mapping options names to option values (both strings).
The glob patterns of the `options_map` do not necessarily need to be the
same as those used in the method mapping. For example, while all files in
the ``templates`` folders in an application may be Genshi applications, the
options for those files may differ based on extension:
>>> options_map = {
... '**/templates/**.txt': {
... 'template_class': 'genshi.template:TextTemplate',
... 'encoding': 'latin-1'
... },
... '**/templates/**.html': {
... 'include_attrs': ''
... }
... }
:param dirname: the path to the directory to extract messages from
:param method_map: a list of ``(pattern, method)`` tuples that maps of
extraction method names to extended glob patterns
:param options_map: a dictionary of additional options (optional)
:param keywords: a dictionary mapping keywords (i.e. names of functions
that should be recognized as translation functions) to
tuples that specify which of their arguments contain
localizable strings
:param comment_tags: a list of tags of translator comments to search for
and include in the results
:param callback: a function that is called for every file that message are
extracted from, just before the extraction itself is
performed; the function is passed the filename, the name
of the extraction method and and the options dictionary as
positional arguments, in that order
:param strip_comment_tags: a flag that if set to `True` causes all comment
tags to be removed from the collected comments.
:return: an iterator over ``(filename, lineno, funcname, message)`` tuples
:rtype: ``iterator``
:see: `pathmatch`
"""
if options_map is None:
options_map = {}
absname = os.path.abspath(dirname)
for root, dirnames, filenames in os.walk(absname):
for subdir in dirnames:
if subdir.startswith('.') or subdir.startswith('_'):
dirnames.remove(subdir)
dirnames.sort()
filenames.sort()
for filename in filenames:
filename = relpath(
os.path.join(root, filename).replace(os.sep, '/'),
dirname
)
for pattern, method in method_map:
if pathmatch(pattern, filename):
filepath = os.path.join(absname, filename)
options = {}
for opattern, odict in options_map.items():
if pathmatch(opattern, filename):
options = odict
if callback:
callback(filename, method, options)
for lineno, message, comments in \
extract_from_file(method, filepath,
keywords=keywords,
comment_tags=comment_tags,
options=options,
strip_comment_tags=
strip_comment_tags):
yield filename, lineno, message, comments
break
def extract_from_file(method, filename, keywords=DEFAULT_KEYWORDS,
comment_tags=(), options=None, strip_comment_tags=False):
"""Extract messages from a specific file.
This function returns a list of tuples of the form:
``(lineno, funcname, message)``
:param filename: the path to the file to extract messages from
:param method: a string specifying the extraction method (.e.g. "python")
:param keywords: a dictionary mapping keywords (i.e. names of functions
that should be recognized as translation functions) to
tuples that specify which of their arguments contain
localizable strings
:param comment_tags: a list of translator tags to search for and include
in the results
:param strip_comment_tags: a flag that if set to `True` causes all comment
tags to be removed from the collected comments.
:param options: a dictionary of additional options (optional)
:return: the list of extracted messages
:rtype: `list`
"""
fileobj = open(filename, 'U')
try:
return list(extract(method, fileobj, keywords, comment_tags, options,
strip_comment_tags))
finally:
fileobj.close()
def extract(method, fileobj, keywords=DEFAULT_KEYWORDS, comment_tags=(),
options=None, strip_comment_tags=False):
"""Extract messages from the given file-like object using the specified
extraction method.
This function returns a list of tuples of the form:
``(lineno, message, comments)``
The implementation dispatches the actual extraction to plugins, based on the
value of the ``method`` parameter.
>>> source = '''# foo module
... def run(argv):
... print _('Hello, world!')
... '''
>>> from StringIO import StringIO
>>> for message in extract('python', StringIO(source)):
... print message
(3, u'Hello, world!', [])
:param method: a string specifying the extraction method (.e.g. "python");
if this is a simple name, the extraction function will be
looked up by entry point; if it is an explicit reference
to a function (of the form ``package.module:funcname`` or
``package.module.funcname``), the corresponding function
will be imported and used
:param fileobj: the file-like object the messages should be extracted from
:param keywords: a dictionary mapping keywords (i.e. names of functions
that should be recognized as translation functions) to
tuples that specify which of their arguments contain
localizable strings
:param comment_tags: a list of translator tags to search for and include
in the results
:param options: a dictionary of additional options (optional)
:param strip_comment_tags: a flag that if set to `True` causes all comment
tags to be removed from the collected comments.
:return: the list of extracted messages
:rtype: `list`
:raise ValueError: if the extraction method is not registered
"""
func = None
if ':' in method or '.' in method:
if ':' not in method:
lastdot = method.rfind('.')
module, attrname = method[:lastdot], method[lastdot + 1:]
else:
module, attrname = method.split(':', 1)
func = getattr(__import__(module, {}, {}, [attrname]), attrname)
else:
try:
from pkg_resources import working_set
except ImportError:
# pkg_resources is not available, so we resort to looking up the
# builtin extractors directly
builtin = {'ignore': extract_nothing, 'python': extract_python}
func = builtin.get(method)
else:
for entry_point in working_set.iter_entry_points(GROUP_NAME,
method):
func = entry_point.load(require=True)
break
if func is None:
raise ValueError('Unknown extraction method %r' % method)
results = func(fileobj, keywords.keys(), comment_tags,
options=options or {})
for lineno, funcname, messages, comments in results:
if funcname:
spec = keywords[funcname] or (1,)
else:
spec = (1,)
if not isinstance(messages, (list, tuple)):
messages = [messages]
if not messages:
continue
# Validate the messages against the keyword's specification
msgs = []
invalid = False
# last_index is 1 based like the keyword spec
last_index = len(messages)
for index in spec:
if last_index < index:
# Not enough arguments
invalid = True
break
message = messages[index - 1]
if message is None:
invalid = True
break
msgs.append(message)
if invalid:
continue
first_msg_index = spec[0] - 1
if not messages[first_msg_index]:
# An empty string msgid isn't valid, emit a warning
where = '%s:%i' % (hasattr(fileobj, 'name') and \
fileobj.name or '(unknown)', lineno)
print >> sys.stderr, empty_msgid_warning % where
continue
messages = tuple(msgs)
if len(messages) == 1:
messages = messages[0]
if strip_comment_tags:
_strip_comment_tags(comments, comment_tags)
yield lineno, messages, comments
def extract_nothing(fileobj, keywords, comment_tags, options):
"""Pseudo extractor that does not actually extract anything, but simply
returns an empty list.
"""
return []
def extract_python(fileobj, keywords, comment_tags, options):
"""Extract messages from Python source code.
:param fileobj: the seekable, file-like object the messages should be
extracted from
:param keywords: a list of keywords (i.e. function names) that should be
recognized as translation functions
:param comment_tags: a list of translator tags to search for and include
in the results
:param options: a dictionary of additional options (optional)
:return: an iterator over ``(lineno, funcname, message, comments)`` tuples
:rtype: ``iterator``
"""
funcname = lineno = message_lineno = None
call_stack = -1
buf = []
messages = []
translator_comments = []
in_def = in_translator_comments = False
comment_tag = None
encoding = parse_encoding(fileobj) or options.get('encoding', 'iso-8859-1')
tokens = generate_tokens(fileobj.readline)
for tok, value, (lineno, _), _, _ in tokens:
if call_stack == -1 and tok == NAME and value in ('def', 'class'):
in_def = True
elif tok == OP and value == '(':
if in_def:
# Avoid false positives for declarations such as:
# def gettext(arg='message'):
in_def = False
continue
if funcname:
message_lineno = lineno
call_stack += 1
elif in_def and tok == OP and value == ':':
# End of a class definition without parens
in_def = False
continue
elif call_stack == -1 and tok == COMMENT:
# Strip the comment token from the line
value = value.decode(encoding)[1:].strip()
if in_translator_comments and \
translator_comments[-1][0] == lineno - 1:
# We're already inside a translator comment, continue appending
translator_comments.append((lineno, value))
continue
# If execution reaches this point, let's see if comment line
# starts with one of the comment tags
for comment_tag in comment_tags:
if value.startswith(comment_tag):
in_translator_comments = True
translator_comments.append((lineno, value))
break
elif funcname and call_stack == 0:
if tok == OP and value == ')':
if buf:
messages.append(''.join(buf))
del buf[:]
else:
messages.append(None)
if len(messages) > 1:
messages = tuple(messages)
else:
messages = messages[0]
# Comments don't apply unless they immediately preceed the
# message
if translator_comments and \
translator_comments[-1][0] < message_lineno - 1:
translator_comments = []
yield (message_lineno, funcname, messages,
[comment[1] for comment in translator_comments])
funcname = lineno = message_lineno = None
call_stack = -1
messages = []
translator_comments = []
in_translator_comments = False
elif tok == STRING:
# Unwrap quotes in a safe manner, maintaining the string's
# encoding
# https://sourceforge.net/tracker/?func=detail&atid=355470&
# aid=617979&group_id=5470
value = eval('# coding=%s\n%s' % (encoding, value),
{'__builtins__':{}}, {})
if isinstance(value, str):
value = value.decode(encoding)
buf.append(value)
elif tok == OP and value == ',':
if buf:
messages.append(''.join(buf))
del buf[:]
else:
messages.append(None)
if translator_comments:
# We have translator comments, and since we're on a
# comma(,) user is allowed to break into a new line
# Let's increase the last comment's lineno in order
# for the comment to still be a valid one
old_lineno, old_comment = translator_comments.pop()
translator_comments.append((old_lineno+1, old_comment))
elif call_stack > 0 and tok == OP and value == ')':
call_stack -= 1
elif funcname and call_stack == -1:
funcname = None
elif tok == NAME and value in keywords:
funcname = value
def extract_javascript(fileobj, keywords, comment_tags, options):
"""Extract messages from JavaScript source code.
:param fileobj: the seekable, file-like object the messages should be
extracted from
:param keywords: a list of keywords (i.e. function names) that should be
recognized as translation functions
:param comment_tags: a list of translator tags to search for and include
in the results
:param options: a dictionary of additional options (optional)
:return: an iterator over ``(lineno, funcname, message, comments)`` tuples
:rtype: ``iterator``
"""
from babel.messages.jslexer import tokenize, unquote_string
funcname = message_lineno = None
messages = []
last_argument = None
translator_comments = []
concatenate_next = False
encoding = options.get('encoding', 'utf-8')
last_token = None
call_stack = -1
for token in tokenize(fileobj.read().decode(encoding)):
if token.type == 'operator' and token.value == '(':
if funcname:
message_lineno = token.lineno
call_stack += 1
elif call_stack == -1 and token.type == 'linecomment':
value = token.value[2:].strip()
if translator_comments and \
translator_comments[-1][0] == token.lineno - 1:
translator_comments.append((token.lineno, value))
continue
for comment_tag in comment_tags:
if value.startswith(comment_tag):
translator_comments.append((token.lineno, value.strip()))
break
elif token.type == 'multilinecomment':
# only one multi-line comment may preceed a translation
translator_comments = []
value = token.value[2:-2].strip()
for comment_tag in comment_tags:
if value.startswith(comment_tag):
lines = value.splitlines()
if lines:
lines[0] = lines[0].strip()
lines[1:] = dedent('\n'.join(lines[1:])).splitlines()
for offset, line in enumerate(lines):
translator_comments.append((token.lineno + offset,
line))
break
elif funcname and call_stack == 0:
if token.type == 'operator' and token.value == ')':
if last_argument is not None:
messages.append(last_argument)
if len(messages) > 1:
messages = tuple(messages)
elif messages:
messages = messages[0]
else:
messages = None
# Comments don't apply unless they immediately precede the
# message
if translator_comments and \
translator_comments[-1][0] < message_lineno - 1:
translator_comments = []
if messages is not None:
yield (message_lineno, funcname, messages,
[comment[1] for comment in translator_comments])
funcname = message_lineno = last_argument = None
concatenate_next = False
translator_comments = []
messages = []
call_stack = -1
elif token.type == 'string':
new_value = unquote_string(token.value)
if concatenate_next:
last_argument = (last_argument or '') + new_value
concatenate_next = False
else:
last_argument = new_value
elif token.type == 'operator':
if token.value == ',':
if last_argument is not None:
messages.append(last_argument)
last_argument = None
else:
messages.append(None)
concatenate_next = False
elif token.value == '+':
concatenate_next = True
elif call_stack > 0 and token.type == 'operator' \
and token.value == ')':
call_stack -= 1
elif funcname and call_stack == -1:
funcname = None
elif call_stack == -1 and token.type == 'name' and \
token.value in keywords and \
(last_token is None or last_token.type != 'name' or
last_token.value != 'function'):
funcname = token.value
last_token = token
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