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77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2019 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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import pyparsing as pp # type: ignore
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import json
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import re
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from helper import _set_up_py_parsing_nicer_debug_output
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_set_up_py_parsing_nicer_debug_output(pp)
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class QMakeSpecificJSONParser:
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def __init__(self, *, debug: bool = False) -> None:
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self.debug = debug
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self.grammar = self.create_py_parsing_grammar()
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def create_py_parsing_grammar(self):
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# Keep around all whitespace.
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pp.ParserElement.setDefaultWhitespaceChars("")
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def add_element(name: str, value: pp.ParserElement):
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nonlocal self
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if self.debug:
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value.setName(name)
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value.setDebug()
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return value
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# Our grammar is pretty simple. We want to remove all newlines
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# inside quoted strings, to make the quoted strings JSON
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# compliant. So our grammar should skip to the first quote while
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# keeping everything before it as-is, process the quoted string
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# skip to the next quote, and repeat that until the end of the
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# file.
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EOF = add_element("EOF", pp.StringEnd())
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SkipToQuote = add_element("SkipToQuote", pp.SkipTo('"'))
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SkipToEOF = add_element("SkipToEOF", pp.SkipTo(EOF))
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def remove_newlines_and_whitespace_in_quoted_string(tokens):
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first_string = tokens[0]
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replaced_string = re.sub(r"\n[ ]*", " ", first_string)
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return replaced_string
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QuotedString = add_element(
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"QuotedString", pp.QuotedString(quoteChar='"', multiline=True, unquoteResults=False)
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)
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QuotedString.setParseAction(remove_newlines_and_whitespace_in_quoted_string)
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QuotedTerm = add_element("QuotedTerm", pp.Optional(SkipToQuote) + QuotedString)
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Grammar = add_element("Grammar", pp.OneOrMore(QuotedTerm) + SkipToEOF)
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return Grammar
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def parse_file_using_py_parsing(self, file: str):
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print(f'Pre processing "{file}" using py parsing to remove incorrect newlines.')
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try:
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with open(file, "r") as file_fd:
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contents = file_fd.read()
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parser_result = self.grammar.parseString(contents, parseAll=True)
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token_list = parser_result.asList()
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joined_string = "".join(token_list)
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return joined_string
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except pp.ParseException as pe:
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print(pe.line)
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print(" " * (pe.col - 1) + "^")
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print(pe)
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raise pe
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def parse(self, file: str):
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pre_processed_string = self.parse_file_using_py_parsing(file)
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print(f'Parsing "{file}" using json.loads().')
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json_parsed = json.loads(pre_processed_string)
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return json_parsed
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