zulip/zephyr/lib/unminify.py

131 lines
4.3 KiB
Python

from __future__ import absolute_import
import re
import bisect
import simplejson
import collections
from os import path
from django.conf import settings
## Un-concatenating source files
class LineToFile(object):
'''Map line numbers in the concatencated source files to
individual file/line pairs.'''
def __init__(self):
self._names = []
self._cumulative_counts = []
total = 0
for filename in settings.PIPELINE_JS['app']['source_filenames']:
self._names.append(filename)
self._cumulative_counts.append(total)
with open(path.join('zephyr/static', filename), 'r') as fil:
total += sum(1 for ln in fil) + 1
def __call__(self, total):
i = bisect.bisect_right(self._cumulative_counts, total) - 1
return (self._names[i], total - self._cumulative_counts[i])
line_to_file = LineToFile()
## Parsing source maps
# Mapping from Base64 digits to numerical value
digits = dict(zip(
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
range(64)))
def parse_base64_vlq(input_str):
'''Interpret a sequence of Base64 digits as sequence of integers
in VLQ encoding.'''
accum, shift = 0, 0
for digit in input_str:
value = digits[digit]
# Low 5 bits provide the next 5 more significant
# bits of the output value.
accum |= (value & 0b11111) << shift
shift += 5
# Top bit is cleared if this is the last digit
# for this output value.
if not value & 0b100000:
# Bottom bit of the result is sign.
sign = -1 if accum & 1 else 1
yield sign * (accum >> 1)
accum, shift = 0, 0
Link = collections.namedtuple('Link',
['src_line', 'src_col', 'gen_line', 'gen_col'])
def parse_mapping(mapstr):
'''Parse a source map v3 mapping string into a sequence of
'links' between source and generated code.'''
fields = [0,0,0,0,0]
for genline_no, group in enumerate(mapstr.split(';')):
# The first field (generated code starting column)
# resets for every group.
fields[0] = 0
for segment in group.split(','):
# Each segment contains VLQ-encoded deltas to the fields.
delta = list(parse_base64_vlq(segment))
delta += [0] * (5-len(delta))
fields = [x+y for x,y in zip(fields, delta)]
# fields[1] indicates which source file produced this
# code, but Pipeline concatenates all files together,
# so this field is always 0.
# Lines and columns are numbered from zero.
yield Link(src_line=fields[2], src_col=fields[3],
gen_line=genline_no, gen_col=fields[0])
## Performing the lookup
class SourceMap(object):
'''Map (line,column) pairs from generated to source file.'''
def __init__(self, sourcemap_file):
with open(sourcemap_file, 'r') as fil:
sourcemap = simplejson.load(fil)
# Pair each link with a sort / search key
self._links = [ ((link.gen_line, link.gen_col), link)
for link in parse_mapping(sourcemap['mappings']) ]
self._links.sort(key = lambda p: p[0])
self._keys = [p[0] for p in self._links]
def _map_position(self, gen_line, gen_col):
i = bisect.bisect_right(self._keys, (gen_line, gen_col))
if not i:
# Zero index indicates no match
return None
link = self._links[i-1][1]
filename, src_line = line_to_file(link.src_line)
src_col = link.src_col + (gen_col - link.gen_col)
return (filename, src_line, src_col)
def annotate_stacktrace(self, stacktrace):
out = ''
for ln in stacktrace.splitlines():
out += ln + '\n'
match = re.search(r'/static/min/app(\.[0-9a-f]+)?\.js:(\d+):(\d+)', ln)
if match:
gen_line, gen_col = map(int, match.groups()[1:3])
result = self._map_position(gen_line-1, gen_col-1)
if result:
filename, src_line, src_col = result
out += (' = %s line %d column %d\n' %
(filename, src_line+1, src_col+1))
if ln.startswith(' at'):
out += '\n'
return out