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