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267e20dd4c
Currently the C preprocessor is used to remove comments from the text files before encoding them. However the option used (`-fpreprocessed`) is only supported by gcc – but not by clang, which breaks the macOS build. By using Python to remove comments, we can remove the use of this gcc-specific option, and fix the macOS build.
71 lines
2 KiB
Python
71 lines
2 KiB
Python
#!/usr/bin/env python3
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#
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# message_data_static text encoder
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#
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import argparse, ast, re
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def read_charmap(path):
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with open(path) as infile:
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charmap = infile.read()
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charmap = ast.literal_eval(charmap)
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charmap = { repr(k)[1:-1] : chr(v) for k,v in charmap.items() }
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return charmap
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# From https://stackoverflow.com/questions/241327/remove-c-and-c-comments-using-python
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def remove_comments(text):
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def replacer(match):
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s = match.group(0)
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if s.startswith('/'):
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return " " # note: a space and not an empty string
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else:
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return s
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pattern = re.compile(
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r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"',
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re.DOTALL | re.MULTILINE
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)
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return re.sub(pattern, replacer, text)
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def convert_text(text, charmap):
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def cvt_str(m):
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string = m.group(0)
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for orig,char in charmap.items():
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string = string.replace(orig, char)
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return string
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# Naive string matcher, assumes single line strings and no comments, handles escaped quotations
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string_regex = re.compile(r'"((?:[^\\"\n]|\\.)*)"')
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# Collapse escaped newlines
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text = text.replace("\\\n", "")
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# Encode according to charmap
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text = re.sub(string_regex, cvt_str, text)
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return text
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def main():
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parser = argparse.ArgumentParser(description="Encode message_data_static text headers")
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parser.add_argument("charmap", help="path to charmap file specifying custom encoding elements")
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parser.add_argument("input", help="path to file to be encoded")
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parser.add_argument("output", help="encoded file")
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args = parser.parse_args()
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charmap = read_charmap(args.charmap)
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text = ""
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with open(args.input, "r") as infile:
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text = infile.read()
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text = remove_comments(text)
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text = convert_text(text, charmap)
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with open(args.output, "w", encoding="raw_unicode_escape") as outfile:
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outfile.write(text)
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if __name__ == "__main__":
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main()
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