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from __future__ import annotations
import json
import pickle
import py_compile
import shutil
import sys
import unittest
from pathlib import Path
from tatsu.ngcodegen import codegen
from tatsu.parser import EBNFParser, GrammarGenerator
from tatsu.parser_semantics import EBNFGrammarSemantics
from tatsu.util import asjson
from tatsu.walkers import DepthFirstWalker
tmp = Path('./tmp').resolve()
sys.path.insert(0, str(tmp))
# ruff: noqa: PLR0914
class BootstrapTests(unittest.TestCase):
def test_bootstrap(self):
print()
tmp = Path('./tmp')
if (tmp / '00.ast').is_file():
shutil.rmtree('./tmp')
tmp.mkdir(exist_ok=True)
print('-' * 20, 'phase 00 - parse using the bootstrap grammar')
text = Path('grammar/tatsu.ebnf').read_text()
g = EBNFParser('EBNFBootstrap')
grammar0 = g.parse(text, parseinfo=False)
ast0 = json.dumps(asjson(grammar0), indent=2)
Path('./tmp/00.ast').write_text(ast0)
print('-' * 20, 'phase 01 - parse with parser generator')
text = Path('grammar/tatsu.ebnf').read_text()
g = GrammarGenerator('EBNFBootstrap')
result = g.parse(text)
generated_grammar1 = str(result)
Path('./tmp/01.ebnf').write_text(generated_grammar1)
print(
'-' * 20,
'phase 02 - parse previous output with the parser generator',
)
text = Path('./tmp/01.ebnf').read_text()
g = GrammarGenerator('EBNFBootstrap')
result = g.parse(text)
generated_grammar2 = str(result)
Path('./tmp/02.ebnf').write_text(generated_grammar2)
self.assertEqual(generated_grammar2, generated_grammar1)
print('-' * 20, 'phase 03 - repeat')
text = Path('./tmp/02.ebnf').read_text()
g = EBNFParser('EBNFBootstrap')
ast3 = g.parse(text)
Path('./tmp/03.ast').write_text(json.dumps(asjson(ast3), indent=2))
print('-' * 20, 'phase 04 - repeat')
text = Path('./tmp/02.ebnf').read_text()
g = GrammarGenerator('EBNFBootstrap')
parser = g.parse(text)
generated_grammar4 = str(parser)
Path('./tmp/04.ebnf').write_text(generated_grammar4)
self.assertEqual(generated_grammar4, generated_grammar2)
print('-' * 20, 'phase 05 - parse using the grammar model')
text = Path('./tmp/04.ebnf').read_text()
ast5 = parser.parse(text)
Path('./tmp/05.ast').write_text(json.dumps(asjson(ast5), indent=2))
print('-' * 20, 'phase 06 - generate parser code')
gencode6 = codegen(parser)
Path('./tmp/g06.py').write_text(gencode6)
print('-' * 20, 'phase 07 - import generated code')
py_compile.compile('./tmp/g06.py', doraise=True)
# g06 = __import__('g06')
# GenParser = g06.EBNFBootstrapParser
# assert GenParser
# print('-' * 20, 'phase 08 - compile using generated code')
# parser = GenParser(trace=False)
# result = parser.parse(original_grammar, semantics=ASTSemantics, parseinfo=False)
# ast8 = json.dumps(asjson(result), indent=2)
# Path('./tmp/08.ast', 'w').write_text(ast8)
# self.assertEqual(ast0, ast8)
print('-' * 20, 'phase 09 - Generate parser with semantics')
text = Path('grammar/tatsu.ebnf').read_text()
parser = GrammarGenerator('EBNFBootstrap')
g9 = parser.parse(text)
generated_grammar9 = str(g9)
Path('./tmp/09.ebnf').write_text(generated_grammar9)
self.assertEqual(generated_grammar9, generated_grammar1)
print('-' * 20, 'phase 10 - Parse with a model using a semantics')
g10 = g9.parse(
text,
start_rule='start',
semantics=EBNFGrammarSemantics('EBNFBootstrap'),
)
generated_grammar10 = str(g10)
Path('./tmp/10.ebnf').write_text(generated_grammar10)
gencode10 = codegen(g10)
Path('./tmp/g10.py').write_text(gencode10)
print('-' * 20, 'phase 11 - Pickle the model and try again.')
with Path('./tmp/11.tatsu').open('wb') as f:
pickle.dump(g10, f)
with Path('./tmp/11.tatsu').open('rb') as f:
g11 = pickle.load(f)
r11 = g11.parse(
text,
start_rule='start',
semantics=EBNFGrammarSemantics('EBNFBootstrap'),
)
Path('./tmp/11.ebnf').write_text(str(g11))
gencode11 = codegen(r11)
Path('./tmp/bootstrap_g11.py').write_text(gencode11)
print('-' * 20, 'phase 12 - Walker')
class PrintNameWalker(DepthFirstWalker):
def __init__(self):
super().__init__()
self.walked = []
def walk_default(self, o, children):
self.walked.append(o.__class__.__name__)
v = PrintNameWalker()
v.walk(g11)
Path('./tmp/12.txt').write_text('\n'.join(v.walked))
print('-' * 20, 'phase 13 - Graphics')
try:
from tatsu.diagrams import draw
except ImportError:
print('PyGraphViz not found!')
else:
draw('./tmp/13.png', g11)
def suite():
return unittest.TestLoader().loadTestsFromTestCase(BootstrapTests)
def main():
unittest.TextTestRunner(verbosity=2).run(suite())
if __name__ == '__main__':
main()
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