DeCarabas/lrparsers
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Make it so Configuration() is constructed fewer places

Browse source 
This will make it so that I can add fields to Configuration to support
additional parser generators without breaking any individual
generator.
This commit is contained in:
John Doty 2016-12-09 06:37:57 -08:00
parent 169ec4ff08
commit cf10891c19
1 changed files with 5 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

10
parser.py
View file

@ -23,6 +23,9 @@ class Configuration(
def at_symbol(self, symbol): def at_symbol(self, symbol):
return self.next == symbol return self.next == symbol
def replace(self, **kwargs):
return self._replace(**kwargs)
def __str__(self): def __str__(self):
return "{name} -> {bits}".format( return "{name} -> {bits}".format(
name=self.name, name=self.name,
@ -136,11 +139,7 @@ class GenerateLR0(object):
the symbol. the symbol.
""" """
seeds = [ seeds = [
Configuration( config.replace(position=config.position + 1)
name=config.name,
symbols=config.symbols,
position=config.position + 1,
)
for config in config_set for config in config_set
if config.at_symbol(symbol) if config.at_symbol(symbol)
] ]
@ -380,6 +379,7 @@ class GenerateSLR1(GenerateLR0):
return follow return follow
def parse(table, input, trace=False): def parse(table, input, trace=False):
"""Parse the input with the generated parsing table and return the """Parse the input with the generated parsing table and return the
concrete syntax tree. concrete syntax tree.