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Diffstat (limited to '.venv/lib/python3.12/site-packages/lark/tools/standalone.py')
| -rw-r--r-- | .venv/lib/python3.12/site-packages/lark/tools/standalone.py | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/lark/tools/standalone.py b/.venv/lib/python3.12/site-packages/lark/tools/standalone.py new file mode 100644 index 00000000..c86d7d7a --- /dev/null +++ b/.venv/lib/python3.12/site-packages/lark/tools/standalone.py @@ -0,0 +1,196 @@ +from __future__ import print_function + +###{standalone +# +# +# Lark Stand-alone Generator Tool +# ---------------------------------- +# Generates a stand-alone LALR(1) parser with a standard lexer +# +# Git: https://github.com/erezsh/lark +# Author: Erez Shinan (erezshin@gmail.com) +# +# +# >>> LICENSE +# +# This tool and its generated code use a separate license from Lark, +# and are subject to the terms of the Mozilla Public License, v. 2.0. +# If a copy of the MPL was not distributed with this +# file, You can obtain one at https://mozilla.org/MPL/2.0/. +# +# If you wish to purchase a commercial license for this tool and its +# generated code, you may contact me via email or otherwise. +# +# If MPL2 is incompatible with your free or open-source project, +# contact me and we'll work it out. +# +# + +from io import open +###} + +import sys +import token, tokenize +import os +from os import path +from collections import defaultdict +from functools import partial +from argparse import ArgumentParser, SUPPRESS +from warnings import warn + +import lark +from lark import Lark +from lark.tools import lalr_argparser, build_lalr, make_warnings_comments + + +from lark.grammar import RuleOptions, Rule +from lark.lexer import TerminalDef + +_dir = path.dirname(__file__) +_larkdir = path.join(_dir, path.pardir) + + +EXTRACT_STANDALONE_FILES = [ + 'tools/standalone.py', + 'exceptions.py', + 'utils.py', + 'tree.py', + 'visitors.py', + 'grammar.py', + 'lexer.py', + 'common.py', + 'parse_tree_builder.py', + 'parsers/lalr_parser.py', + 'parsers/lalr_analysis.py', + 'parser_frontends.py', + 'lark.py', + 'indenter.py', +] + +def extract_sections(lines): + section = None + text = [] + sections = defaultdict(list) + for l in lines: + if l.startswith('###'): + if l[3] == '{': + section = l[4:].strip() + elif l[3] == '}': + sections[section] += text + section = None + text = [] + else: + raise ValueError(l) + elif section: + text.append(l) + + return {name:''.join(text) for name, text in sections.items()} + + +def strip_docstrings(line_gen): + """ Strip comments and docstrings from a file. + Based on code from: https://stackoverflow.com/questions/1769332/script-to-remove-python-comments-docstrings + """ + res = [] + + prev_toktype = token.INDENT + last_lineno = -1 + last_col = 0 + + tokgen = tokenize.generate_tokens(line_gen) + for toktype, ttext, (slineno, scol), (elineno, ecol), ltext in tokgen: + if slineno > last_lineno: + last_col = 0 + if scol > last_col: + res.append(" " * (scol - last_col)) + if toktype == token.STRING and prev_toktype == token.INDENT: + # Docstring + res.append("#--") + elif toktype == tokenize.COMMENT: + # Comment + res.append("##\n") + else: + res.append(ttext) + prev_toktype = toktype + last_col = ecol + last_lineno = elineno + + return ''.join(res) + + +def main(fobj, start, print=print): + warn('`lark.tools.standalone.main` is being redesigned. Use `gen_standalone`', DeprecationWarning) + lark_inst = Lark(fobj, parser="lalr", lexer="contextual", start=start) + gen_standalone(lark_inst, print) + +def gen_standalone(lark_inst, output=None, out=sys.stdout, compress=False): + if output is None: + output = partial(print, file=out) + + import pickle, zlib, base64 + def compressed_output(obj): + s = pickle.dumps(obj, pickle.HIGHEST_PROTOCOL) + c = zlib.compress(s) + output(repr(base64.b64encode(c))) + + def output_decompress(name): + output('%(name)s = pickle.loads(zlib.decompress(base64.b64decode(%(name)s)))' % locals()) + + output('# The file was automatically generated by Lark v%s' % lark.__version__) + output('__version__ = "%s"' % lark.__version__) + output() + + for i, pyfile in enumerate(EXTRACT_STANDALONE_FILES): + with open(os.path.join(_larkdir, pyfile)) as f: + code = extract_sections(f)['standalone'] + if i: # if not this file + code = strip_docstrings(partial(next, iter(code.splitlines(True)))) + output(code) + + data, m = lark_inst.memo_serialize([TerminalDef, Rule]) + output('import pickle, zlib, base64') + if compress: + output('DATA = (') + compressed_output(data) + output(')') + output_decompress('DATA') + output('MEMO = (') + compressed_output(m) + output(')') + output_decompress('MEMO') + else: + output('DATA = (') + output(data) + output(')') + output('MEMO = (') + output(m) + output(')') + + + output('Shift = 0') + output('Reduce = 1') + output("def Lark_StandAlone(**kwargs):") + output(" return Lark._load_from_dict(DATA, MEMO, **kwargs)") + + + + +def main(): + make_warnings_comments() + parser = ArgumentParser(prog="prog='python -m lark.tools.standalone'", description="Lark Stand-alone Generator Tool", + parents=[lalr_argparser], epilog='Look at the Lark documentation for more info on the options') + parser.add_argument("old_start", nargs='?', help=SUPPRESS) + parser.add_argument('-c', '--compress', action='store_true', default=0, help="Enable compression") + if len(sys.argv)==1: + parser.print_help(sys.stderr) + sys.exit(1) + ns = parser.parse_args() + if ns.old_start is not None: + warn('The syntax `python -m lark.tools.standalone <grammar-file> <start>` is deprecated. Use the -s option') + ns.start.append(ns.old_start) + + lark_inst, out = build_lalr(ns) + gen_standalone(lark_inst, out=out, compress=ns.compress) + +if __name__ == '__main__': + main()
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