syncfiles/scripts/extract.py

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"""Extract script and region constants from Script.h."""
import csv
import os
import re
import sys
from typing import Iterator, List, Tuple
Item = Tuple[str, int]
def list_enums(filename: str) -> Iterator[Item]:
"""List enum definitions in a file."""
with open(filename, 'rb') as fp:
data = fp.read()
for item in re.finditer(
rb'^\s*(\w+)\s*=\s*((?:0x)?\d+)u?l?\b',
data, re.MULTILINE | re.IGNORECASE):
name, value = item.groups()
yield name.decode('ASCII'), int(value, 0)
def index_of(data: List[Item], key: str) -> int:
for i, (name, _) in enumerate(data):
if name == key:
return i
raise ValueError('missing value: {!r}'.format(key))
def slice(data: List[Item], first: str, last: str) -> List[Item]:
return data[index_of(data, first):index_of(data, last)+1]
def write_csv(fname: str, data: List[Item]) -> None:
print('Writing', fname, file=sys.stderr)
with open(fname, 'w') as fp:
w = csv.writer(fp)
w.writerow(['Name', 'Value'])
for item in data:
w.writerow(item)
def process_script(filename: str) -> None:
scripts: List[Item] = []
regions: List[Item] = []
for name, value in list_enums(filename):
if name.startswith('sm'):
scripts.append((name, value))
elif name.startswith('ver'):
regions.append((name, value))
write_csv('script.csv', slice(scripts, 'smRoman', 'smUninterp'))
write_csv('region.csv', slice(regions, 'verUS', 'verGreenland'))
def process_textcommon(filename: str) -> None:
encodings: List[Item] = []
for name, value in list_enums(filename):
if name.startswith('kTextEncoding'):
encodings.append((name, value))
write_csv('encoding.csv', encodings)
def process(filename: str) -> None:
name = os.path.basename(filename).lower()
if name == 'script.h':
process_script(filename)
elif name == 'textcommon.h':
process_textcommon(filename)
else:
print('Error: unknown header file:', repr(filename), file=sys.stderr)
raise SystemExit(1)
def main(argv: List[str]) -> None:
if not argv:
sys.stderr.write(
'Usage: script_gen.py [<file.h>...]\n'
'This will read Script.h and TextCommon.h\n')
raise SystemExit(2)
for arg in argv:
process(arg)
if __name__ == '__main__':
main(sys.argv[1:])