113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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wakatime.languages
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~~~~~~~~~~~~~~~~~~
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Parse dependencies from a source code file.
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:copyright: (c) 2014 Alan Hamlett.
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:license: BSD, see LICENSE for more details.
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"""
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import logging
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import sys
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import traceback
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from ..compat import u, open, import_module
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log = logging.getLogger('WakaTime')
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class TokenParser(object):
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"""The base class for all dependency parsers. To add support for your
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language, inherit from this class and implement the :meth:`parse` method
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to return a list of dependency strings.
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"""
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def __init__(self, source_file, lexer=None):
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self.tokens = []
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self.dependencies = []
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self.source_file = source_file
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self.lexer = lexer
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def parse(self, tokens=[]):
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""" Should return a list of dependencies.
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"""
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if not tokens and not self.tokens:
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self.tokens = self._extract_tokens()
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raise Exception('Not yet implemented.')
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def append(self, dep, truncate=False, separator=None, truncate_to=None,
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strip_whitespace=True):
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self._save_dependency(
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dep,
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truncate=truncate,
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truncate_to=truncate_to,
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separator=separator,
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strip_whitespace=strip_whitespace,
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)
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def _extract_tokens(self):
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if self.lexer:
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try:
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with open(self.source_file, 'r', encoding='utf-8') as fh:
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return self.lexer.get_tokens_unprocessed(fh.read(512000))
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except:
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pass
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try:
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with open(self.source_file, 'r', encoding=sys.getfilesystemencoding()) as fh:
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return self.lexer.get_tokens_unprocessed(fh.read(512000))
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except:
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pass
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return []
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def _save_dependency(self, dep, truncate=False, separator=None,
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truncate_to=None, strip_whitespace=True):
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if truncate:
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if separator is None:
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separator = u('.')
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separator = u(separator)
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dep = dep.split(separator)
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if truncate_to is None or truncate_to < 1:
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truncate_to = 1
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if truncate_to > len(dep):
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truncate_to = len(dep)
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dep = dep[0] if len(dep) == 1 else separator.join(dep[:truncate_to])
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if strip_whitespace:
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dep = dep.strip()
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if dep and (not separator or not dep.startswith(separator)):
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self.dependencies.append(dep)
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class DependencyParser(object):
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source_file = None
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lexer = None
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parser = None
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def __init__(self, source_file, lexer):
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self.source_file = source_file
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self.lexer = lexer
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if self.lexer:
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module_name = self.lexer.__module__.rsplit('.', 1)[-1]
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class_name = self.lexer.__class__.__name__.replace('Lexer', 'Parser', 1)
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else:
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module_name = 'unknown'
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class_name = 'UnknownParser'
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try:
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module = import_module('.%s' % module_name, package=__package__)
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try:
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self.parser = getattr(module, class_name)
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except AttributeError:
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log.debug('Module {0} is missing class {1}'.format(module.__name__, class_name))
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except ImportError:
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log.debug(traceback.format_exc())
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def parse(self):
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if self.parser:
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plugin = self.parser(self.source_file, lexer=self.lexer)
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dependencies = plugin.parse()
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return list(set(dependencies))
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return []
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