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