terminator/terminatorlib/configfile.py

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2009-04-24 09:57:17 +00:00
#!/usr/bin/python
import re
from terminatorlib.config import dbg, debug
from terminatorlib import translation
def group(*choices): return '(' + '|'.join(choices) + ')'
def any(*choices): return group(*choices) + '*'
def maybe(*choices): return group(*choices) + '?'
Newline = re.compile(r'[\r\n]+')
Whitespace = r'[ \f\t]*'
Comment = r'#[^\r\n]*'
Ignore = re.compile(Whitespace + maybe(Comment) + maybe(r'[\r\n]+') + '$')
WhitespaceRE = re.compile(Whitespace)
CommentRE = re.compile(Comment)
QuotedStrings = {"'": re.compile(r"'([^'\r\n]*)'"), '"': re.compile(r'"([^"\r\n]*)"')}
Section = re.compile(r"\[([^\r\n\]]+)\][ \f\t]*")
Setting = re.compile(r"(\w+)\s*=\s*")
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PaletteColours = '(?:#[0-9a-fA-F]{12}:){15}#[0-9a-fA-F]{12}'
SingleColour = '#[0-9a-fA-F]{6}|#[0-9a-fA-F]{3}'
Colourvalue = re.compile(group(PaletteColours, SingleColour))
Barevalue = re.compile(r'((?:[^\r\n# \f\t]+|[^\r\n#]+(?!' + Ignore.pattern +'))+)')
Tabsize = 8
HandleIndents = False
class ConfigSyntaxError(Exception):
def __init__(self, message, cf):
self.single_error = cf.errors_are_fatal
self.message = message
self.file = cf.filename
self.lnum = cf._lnum
self.pos = cf._pos
self.line = cf._line
def __str__(self):
if self.single_error:
fmt = "File %(file)s line %(lnum)d:\n %(line)s\n %(pad)s^\n%(message)s"
else:
fmt = " * %(message)s, line %(lnum)d:\n %(line)s\n %(pad)s^\n"
return fmt % {'message': self.message, 'file': self.file, 'lnum': self.lnum,
'line': self.line.rstrip(), 'pad': '-' * self.pos}
class ConfigIndentError(ConfigSyntaxError):
pass
class ParsedWithErrors(Exception):
def __init__(self, filename, errors):
self.file = filename
self.errors = errors
def __str__(self):
return """Errors were encountered while parsing configuration file:
%r
Some lines have been ignored.
%s
""" % (self.file, "\n".join(map(lambda error: str(error), self.errors)))
class ConfigFile:
def __init__(self, filename = None, callback = None, errors_are_fatal = False):
self.callback = callback
self.errors_are_fatal = errors_are_fatal
self.filename = filename
self.errors = []
def _call_if_match(self, re, callable, group = 0):
if self._pos == self._max:
return False
mo = re.match(self._line, self._pos)
if mo:
if callable:
callable(mo.group(group))
self._pos = mo.end()
return True
else:
return False
def _call_if_quoted_string(self, callable):
if self._pos == self._max:
return False
chr = self._line[self._pos]
if chr in '"\'':
string = ''
while True:
mo = QuotedStrings[chr].match(self._line, self._pos)
if mo is None:
raise ConfigSyntaxError(_("Unterminated quoted string"), self)
self._pos = mo.end()
if self._line[self._pos - 2] == '\\':
string += mo.group(1)[0:-1] + chr
self._pos -= 1
else:
string += mo.group(1)
break
callable(string)
return True
else:
return False
def parse(self):
file = open(self.filename)
rc = file.readlines()
file.close()
self._indents = [0]
self._pos = 0
self._max = 0
self._lnum = 0
self._line = ''
self._sections = {}
self._currsetting = None
self._currvalue = None
self.errors = []
for self._line in rc:
try:
self._lnum += 1
self._pos = 0
self._max = len(self._line)
dbg("Line %d: %r" % (self._lnum, self._line))
if HandleIndents:
self._find_indent()
else:
self._call_if_match(WhitespaceRE, None)
# [Section]
self._call_if_match(Section, self._section, 1)
# setting =
if self._call_if_match(Setting, self._setting, 1):
# "quoted value"
if not self._call_if_quoted_string(self._value):
# #000000 # colour that would otherwise be a comment
if not self._call_if_match(Colourvalue, self._value, 1):
# bare value
if not self._call_if_match(Barevalue, self._value, 1):
raise ConfigSyntaxError(_("Setting without a value"), self)
self._call_if_match(Ignore, lambda junk: dbg("Skipping: %r" % junk))
if self._line[self._pos:] != '':
raise ConfigSyntaxError(_("Unexpected token"), self)
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self._line_ok()
except ConfigSyntaxError, e:
self._line_error(e)
except ConfigIndentError, e:
self.errors.append(e)
break
if self.errors:
raise ParsedWithErrors(self.filename, self.errors)
def _find_indent(self):
# Based on tokenizer.py in the base Python standard library
column = 0
while self._pos < self._max:
chr = self._line[self._pos]
if chr == ' ': column += 1
elif chr == '\t': column = (column / Tabsize + 1) * Tabsize
elif chr == '\f': column = 0
else: break
self._pos += 1
if self._pos == self._max: return
if column > self._indents[-1]:
self._indents.append(column)
self._indent() # self._line[:self._pos])
while column < self._indents[-1]:
if column not in self._indents:
raise ConfigSyntaxError("Unindent does not match a previous indent, config parsing aborted", self)
self._indents.pop()
self._deindent()
def _indent(self):
dbg(" -> Indent %d" % len(self._indents))
def _deindent(self):
dbg(" -> Deindent %d" % len(self._indents))
def _get_section(self):
i = 1
sections = []
while i <= len(self._indents):
sname = self._sections.get(i, None)
if not sname:
break
sections.append(str(sname))
i += 1
return tuple(sections)
def _section(self, section):
dbg("Section %r" % section)
self._sections[len(self._indents)] = section.lower()
def _setting(self, setting):
dbg("Setting %r" % setting)
self._currsetting = setting.lower()
def _value(self, value):
dbg("Value %r" % value)
self._currvalue = value
def _line_ok(self):
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if self._currvalue is None: return
else:
try: # *glares at 2.4 users*
try:
self.callback(self._get_section(), self._currsetting, self._currvalue)
except ValueError, e:
raise ConfigSyntaxError(str(e), self)
finally:
self._currvalue = None
def _line_error(self, e):
self._currvalue = None
if self.errors_are_fatal:
raise e
else:
self.errors.append(e)