def pgen_to_grammar_obj (source):
pgen = PyPgen.PyPgen()
nfa_grammar = pgen.handleStart(PgenParser.parseString(source))
dfa_grammar = pgen.generateDfaGrammar(nfa_grammar)
pgen.translateLabels(dfa_grammar)
pgen.generateFirstSets(dfa_grammar)
dfa_grammar = DFAParser.addAccelerators(dfa_grammar)
return dfa_grammar
def pgen_compose (pgen_st1, pgen_st2, start_symbol, additional_tokens = None):
nfa_grammar1 = pgen.handleStart(pgen_st1)
nfa_grammar2 = pgen.handleStart(pgen_st2)
nfa_composed = nfa.compose_nfas(nfa_grammar1, nfa_grammar2)
grammar3 = pgen.generateDfaGrammar(nfa_composed, start_symbol)
pgen.translateLabels(grammar3, additional_tokens)
pgen.generateFirstSets(grammar3)
grammar3[0] = map(tuple, grammar3[0])
return DFAParser.addAccelerators(tuple(grammar3))
def pgen_to_grammar_obj (source):
'''XXX Stolen from PyCon 2010 sprint sandbox. Move into Basil proper.'''
pgen = PyPgen.PyPgen()
nfa_grammar = pgen.handleStart(PgenParser.parseString(source))
dfa_grammar = pgen.generateDfaGrammar(nfa_grammar)
pgen.translateLabels(dfa_grammar)
pgen.generateFirstSets(dfa_grammar)
dfa_grammar = DFAParser.addAccelerators(dfa_grammar)
return dfa_grammar
def setUp (self):
# Parse the MyFront grammar, create a set of automata for it (like
# pgen does), and then convert the automata to generators for the
# treepoline.
grammar_st = PgenParser.parseFile(basil.lang.python.__path__[0] +
"/python26/Grammar")
grammar_obj = PyPgen.buildParser(grammar_st)
grammar_obj.setStart(grammar_obj.stringToSymbolMap()['file_input'])
self.parser1 = grammar_obj
gram_tup0 = grammar_obj.toTuple()
gram_tup1 = DFAParser.addAccelerators(gram_tup0)
handlers = trampoline.pgen_grammar_to_handlers(gram_tup1, {})
# Override the start special nonterminal to just do what it is
# supposed to:
def parse_start (instream, outtree):
yield 'file_input'
handlers['start'] = parse_start
self.handlers = handlers
def main (*args):
"""main() - Unit test routine for the PushdownAutomaton module."""
from basil.lang.python import DFAParser
from basil.parsing import PgenParser, PyPgen
import sys, getopt
# ____________________________________________________________
opts, args = getopt.getopt(args, "o:")
outFile = sys.stdout
for optFlag, optArg in opts:
if optFlag == "-o":
outFile = open(optArg, "w")
argc = len(args)
if argc > 1:
print "Usage:\n\tPushdownAutomaton.py [opts] <file.pgen>\n"
sys.exit(-1)
elif argc == 1:
srcFile = args[0]
else:
srcFile = "./tests/test.pgen"
grammarST = PgenParser.parseFile(srcFile)
parser = PyPgen.buildParser(grammarST)
grammarTup = parser.grammarObj
# ____________________________________________________________
# Round trip test
myGrammarObj = PushdownGrammar(grammarTup)
myGrammarObj.compareToTuple(grammarTup)
grammarTup2 = myGrammarObj.toTuple()
myGrammarObj.compareToTuple(grammarTup2)
# Now with accelerators...
grammarTup3 = DFAParser.addAccelerators(grammarTup)
myGrammarObj2 = PushdownGrammar(grammarTup3)
myGrammarObj2.compareToTuple(grammarTup3)
grammarTup4 = myGrammarObj2.toTuple()
myGrammarObj2.compareToTuple(grammarTup4)
# ____________________________________________________________
# Output tests.
outFile.write("%s\n" % myGrammarObj2.toString("graphviz"))
if outFile != sys.stdout:
outFile.close()
"""
MY_START_SYMBOL = 'file_input'
pgen = PyPgen.PyPgen()
py_grammar_path = os.path.split(basil.lang.python.__file__)[0]
py_nfa_grammar = pgen.handleStart(PgenParser.parseFile(
os.path.join(py_grammar_path, 'python26/Grammar')))
ext_nfa_grammar = pgen.handleStart(PgenParser.parseString(MY_GRAMMAR_EXT))
my_nfa_grammar = nfa.compose_nfas(py_nfa_grammar, ext_nfa_grammar)
my_grammar0 = pgen.generateDfaGrammar(my_nfa_grammar, MY_START_SYMBOL)
pgen.translateLabels(my_grammar0, {'QUOTED' : mylexer.QUOTED})
pgen.generateFirstSets(my_grammar0)
my_grammar0[0] = map(tuple, my_grammar0[0])
my_grammar0 = tuple(my_grammar0)
my_grammar = DFAParser.addAccelerators(my_grammar0)
del my_grammar0
__DEBUG__ = False
if __DEBUG__:
import pprint
# ______________________________________________________________________
# Class and function definitions
class MyComposedParser (object):
def __init__ (self):
global my_grammar
self.handlers = trampoline.pgen_grammar_to_handlers(my_grammar, {})
self.handlers['start'] = self.parse_start
