Created
June 9, 2023 06:38
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import json | |
import sys | |
BASE64_ALPHABET = ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" | |
"0123456789+/") | |
BASE64_TABLE = dict(zip(BASE64_ALPHABET, range(64))) | |
def decode_vlq(s): | |
octets = [BASE64_TABLE[c] for c in s] | |
i = 0 | |
res = [] | |
while i < len(octets): | |
cur = 0 | |
cont = True | |
shift = 0 | |
while cont: | |
cont = octets[i] & 0x20 | |
val = octets[i] & 0x1f | |
cur |= val << shift | |
i += 1 | |
shift += 5 | |
neg = cur & 1 | |
cur >>= 1 | |
if neg: | |
res.append(-cur) | |
else: | |
res.append(cur) | |
print(s, octets, res) | |
return res | |
def main(): | |
with open(sys.argv[1]) as f: | |
source_map = json.load(f) | |
mappings = source_map["mappings"] | |
sources = source_map["sources"] | |
mapping = [0] * 5 | |
for line, line_mapping in enumerate(mappings.split(";")): | |
mapping[0] = 0 | |
for col_mapping in line_mapping.split(","): | |
res = decode_vlq(col_mapping) | |
res += [0] * (5 - len(res)) | |
mapping = [x + y for x, y in zip(mapping, res)] | |
print(f"{line}:{mapping[0]} -> " | |
f"{sources[mapping[1]]}:{mapping[2]}:{mapping[3]}") | |
print("-----------------------") | |
if __name__ == "__main__": | |
main() |
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