zulip/zerver/lib/unminify.py

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import re
import os
import sourcemap
from typing import Dict, List
class SourceMap:
'''Map (line, column) pairs from generated to source file.'''
def __init__(self, sourcemap_dirs: List[str]) -> None:
self._dirs = sourcemap_dirs
self._indices = {} # type: Dict[str, sourcemap.SourceMapDecoder]
def _index_for(self, minified_src: str) -> sourcemap.SourceMapDecoder:
'''Return the source map index for minified_src, loading it if not
already loaded.'''
if minified_src not in self._indices:
for source_dir in self._dirs:
filename = os.path.join(source_dir, minified_src + '.map')
if os.path.isfile(filename):
with open(filename) as fp:
self._indices[minified_src] = sourcemap.load(fp)
break
return self._indices[minified_src]
def annotate_stacktrace(self, stacktrace: str) -> str:
out = '' # type: str
for ln in stacktrace.splitlines():
out += ln + '\n'
match = re.search(r'/static/(?:webpack-bundles|min)/(.+)(\.[\.0-9a-f]+)\.js:(\d+):(\d+)', ln)
if match:
# Get the appropriate source map for the minified file.
minified_src = match.groups()[0] + '.js'
index = self._index_for(minified_src)
gen_line, gen_col = list(map(int, match.groups()[2:4]))
# The sourcemap lib is 0-based, so subtract 1 from line and col.
try:
result = index.lookup(line=gen_line-1, column=gen_col-1)
out += (' = %s line %d column %d\n' %
(result.src, result.src_line+1, result.src_col+1))
except IndexError:
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out += ' [Unable to look up in source map]\n'
if ln.startswith(' at'):
out += '\n'
return out