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# R overlay -- util, map file reader
# -*- coding: utf-8 -*-
# Copyright (C) 2012 André Erdmann <dywi@mailerd.de>
# Distributed under the terms of the GNU General Public License;
# either version 2 of the License, or (at your option) any later version.
import logging
import re
import roverlay.util.fileio
class MapFileParser ( object ):
"""Parser for reading <key,value^n> maps from files or text input."""
# shared attr
logger = logging.getLogger ( 'MapFileParser' )
log_unparseable = logger.warning
multiline_start_char = '{'
multiline_stop_char = '}'
comment_char = '#'
single_line_separator = re.compile ( '\s+[:][:]\s+' )
def __init__ ( self, value_separator=None ):
super ( MapFileParser, self ).__init__()
if value_separator is not None:
self.single_line_separator = re.compile ( value_separator )
# else use shared
self._next = None
# items = list ( tuple ( <key>, list ( <value(s)> ) ) )
self._items = list()
# --- end of __init__ (...) ---
def zap ( self ):
if self._next is not None:
self.logger.warning (
"Multi line entry does not end at EOF - ignored"
)
self.stop_reading = False
self._next = None
self._items = list()
# --- end of zap (...) ---
def has_context ( self ):
return ( self._next is not None )
# --- end of has_context (...) ---
def make_result ( self ):
return self._items
# --- end of make_result (...) ---
def done ( self, *args, **kwargs ):
ret = self.make_result ( *args, **kwargs )
self.zap()
return ret
# --- end of done (...) ---
def preparse_line ( self, line ):
return line.strip()
# --- end of preparse_line (...) ---
def handle_multiline_begin ( self, line ):
self._next = ( line, list() )
return True
# --- end of handle_multiline_begin (...) ---
def handle_multiline_end ( self, line ):
self._items.append ( self._next )
self._next = None
return True
# --- end of handle_multiline_end (...) ---
def handle_multiline_append ( self, line ):
self._next[1].append ( line )
return True
# --- end of handle_multiline_append (...) ---
def handle_comment_line ( self, line ):
return True
# --- end of handle_comment_line (...) ---
def handle_option_line ( self, line ):
return False
# --- end of handle_option_line (...) ---
def handle_entry_line ( self, key=None, value=None ):
if key and value:
self._items.append ( ( key, [ value ] ) )
return True
else:
return False
# --- end of handle_entry_line (...) ---
def add ( self, line ):
l = self.preparse_line ( line )
if not l:
return True
elif self._next is not None:
if l[0] == self.multiline_stop_char:
# end of a multiline entry
# add it to self._items and set next to None
return self.handle_multiline_end ( l[1:].lstrip() )
else:
return self.handle_multiline_append ( l )
elif l[0] == self.comment_char:
# it's intentional that multi line rules cannot contain comments
return self.handle_comment_line ( l[1:].lstrip() )
elif self.handle_option_line ( l ):
return True
elif len ( l ) > 1 and l[-1] == self.multiline_start_char:
return self.handle_multiline_begin ( l[:-1].rstrip() )
else:
return self.handle_entry_line (
*self.single_line_separator.split ( l, 1 )
)
# --- end of add (...) ---
def read_lines_done ( self ):
pass
# --- end of read_lines_done (...) ---
def read_lines_begin ( self ):
pass
# --- end of read_lines_begin (...) ---
def read_lines ( self, lines, src=None ):
self.read_lines_begin()
self.stop_reading = False
ret = True
for lino, line in enumerate ( lines ):
if not self.add ( line ):
ret = False
self.log_unparseable (
"{f}: cannot parse line {n:d}: {txt!r}".format (
f=( src or "<input>" ), n=lino+1, txt=line
)
)
if self.stop_reading:
break
self.read_lines_done()
return ret
# --- end of read_lines (...) ---
def read_file ( self, filepath, handle_compressed=True ):
try:
if handle_compressed:
ret = self.read_lines (
roverlay.util.fileio.read_text_file ( filepath ), filepath
)
else:
with open ( filepath, 'rt' ) as FH:
ret = self.read_lines ( FH.readlines(), filepath )
except IOError:
self.logger.error (
"Could not read file {!r}.".format ( filepath )
)
raise
return ret
# --- end of read_file (...) ---
# --- end of MapFileParser ---
class DictFileParser ( MapFileParser ):
"""MapFileParser that creates a dict as result."""
def make_result ( self, unpack_values=True, strict_unpack=False ):
def unpacked ( value ):
if value:
return value[0] if len ( value ) == 1 else value
else:
return None
# --- end of unpacked (...) ---
can_unpack = True
if strict_unpack and can_unpack:
for k, v in self._items:
if len ( v ) > 1:
assert not isinstance ( v, str )
can_unpack = False
break
if can_unpack:
return { k: unpacked ( v ) for k, v in self._items }
else:
return { k: v for k, v in self._items }
# --- end of make_result (...) ---
# --- end of DictFileParser ---
class ReverseDictFileParser ( MapFileParser ):
"""Like DictFileParser,
but creates a "<value,key> for value in value^n" dict.
"""
# this is the common case for map files used in roverlay,
# multiple values should be mapped to a single key
# (e.g. dependency rules, but the depres parser doesn't use this class)
#
def iter_result_pairs ( self ):
for value, keys in self._items:
for key in keys:
if key:
yield ( key, value )
# --- end of iter_pairs (...) ---
def make_result ( self ):
return { k: v for k, v in self.iter_result_pairs() }
# --- end of make_result (...) ---
# --- end of ReverseDictFileParser ---
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