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ccxt/static_dependencies/lark/tools/standalone.py

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+###{standalone
+#
+#
+#   Lark Stand-alone Generator Tool
+# ----------------------------------
+# Generates a stand-alone LALR(1) parser
+#
+# 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 copy import deepcopy
+from abc import ABC, abstractmethod
+from types import ModuleType
+from typing import (
+    TypeVar, Generic, Type, Tuple, List, Dict, Iterator, Collection, Callable, Optional, FrozenSet, Any,
+    Union, Iterable, IO, TYPE_CHECKING, overload, Sequence,
+    Pattern as REPattern, ClassVar, Set, Mapping
+)
+###}
+
+import sys
+import token, tokenize
+import os
+from os import path
+from collections import defaultdict
+from functools import partial
+from argparse import ArgumentParser
+
+import lark
+from lark.tools import lalr_argparser, build_lalr, make_warnings_comments
+
+
+from lark.grammar import 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_analysis.py',
+    'parsers/lalr_parser_state.py',
+    'parsers/lalr_parser.py',
+    'parsers/lalr_interactive_parser.py',
+    'parser_frontends.py',
+    'lark.py',
+    'indenter.py',
+]
+
+def extract_sections(lines):
+    section = None
+    text = []
+    sections = defaultdict(list)
+    for line in lines:
+        if line.startswith('###'):
+            if line[3] == '{':
+                section = line[4:].strip()
+            elif line[3] == '}':
+                sections[section] += text
+                section = None
+                text = []
+            else:
+                raise ValueError(line)
+        elif section:
+            text.append(line)
+
+    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 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('-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()
+
+    lark_inst, out = build_lalr(ns)
+    gen_standalone(lark_inst, out=out, compress=ns.compress)
+
+    ns.out.close()
+    ns.grammar_file.close()
+
+
+if __name__ == '__main__':
+    main()