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98 lines
2.9 KiB
98 lines
2.9 KiB
4 months ago
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#!/usr/bin/env python
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#
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# Copyright 2015 Google Inc.
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#
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# This script does a very rough simulation of BUILD file expansion,
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# mostly to see the effects of glob().
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# We start by adding some symbols to our namespace that BUILD.public calls.
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import glob
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import os
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import pprint
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import re
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def noop(*args, **kwargs):
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pass
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def select_simulator(d):
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result = []
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for k in d:
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result.append("*** BEGIN %s ***" % k)
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result.extend(d[k])
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result.append("*** END %s ***" % k)
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return result
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DOUBLE_STAR_RE = re.compile(r'/\*\*/')
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STAR_RE = re.compile(r'\*')
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DOUBLE_STAR_PLACEHOLDER = "xxxdoublestarxxx"
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STAR_PLACEHOLDER = "xxxstarxxx"
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# Returns a set of files that match pattern.
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def BUILD_glob_single(pattern):
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if pattern.find('**') < 0:
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# If pattern doesn't include **, glob.glob more-or-less does the right
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# thing.
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return glob.glob(pattern)
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# First transform pattern into a regexp.
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# Temporarily remove ** and *.
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pattern2 = DOUBLE_STAR_RE.sub(DOUBLE_STAR_PLACEHOLDER, pattern)
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pattern3 = STAR_RE.sub(STAR_PLACEHOLDER, pattern2)
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# Replace any regexp special characters.
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pattern4 = re.escape(pattern3)
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# Replace * with [^/]* and ** with .*.
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pattern5 = pattern4.replace(STAR_PLACEHOLDER, '[^/]*')
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pattern6 = pattern5.replace(DOUBLE_STAR_PLACEHOLDER, '.*/')
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# Anchor the match at the beginning and end.
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pattern7 = "^" + pattern6 + "$"
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pattern_re = re.compile(pattern7)
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matches = set()
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for root, _, files in os.walk('.'):
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for fname in files:
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# Remove initial "./".
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path = os.path.join(root, fname)[2:]
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if pattern_re.match(path):
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matches.add(path)
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return matches
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# Simulates BUILD file glob().
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def BUILD_glob(include, exclude=()):
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files = set()
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for pattern in include:
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files.update(BUILD_glob_single(pattern))
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for pattern in exclude:
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files.difference_update(BUILD_glob_single(pattern))
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return list(sorted(files))
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# With these namespaces, we can treat BUILD.public as if it were
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# Python code. This pulls its variable definitions (SRCS, HDRS,
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# DEFINES, etc.) into local_names.
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global_names = {
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'cc_library': noop,
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'cc_test': noop,
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'exports_files': noop,
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'glob': BUILD_glob,
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'select': select_simulator,
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'BASE_DIR': '',
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'BASE_EXTERNAL_DEPS_ANDROID': [],
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'BASE_EXTERNAL_DEPS_IOS': [],
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'BASE_EXTERNAL_DEPS_UNIX': [],
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'CONDITION_ANDROID': 'CONDITION_ANDROID',
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'CONDITION_IOS': 'CONDITION_IOS',
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'DM_EXTERNAL_DEPS': [],
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'EXTERNAL_DEPS_ALL': [],
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'EXTERNAL_INCLUDES': [],
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}
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local_names = {}
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execfile('BUILD.public', global_names, local_names)
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with open('tools/BUILD.public.expected', 'w') as out:
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print >>out, "This file is auto-generated by tools/BUILD_simulator.py."
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print >>out, "It expands BUILD.public to make it easy to see changes."
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for name, value in sorted(local_names.items()):
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print >>out, name, '= ',
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pprint.pprint(value, out)
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