73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "GlslMinify.h"
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#include <regex>
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namespace glslminifier {
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using std::regex;
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// Slash slash comments:
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// [\t ]* check for tabs and spaces up until
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// \/\/ two consecutive forward slashes
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// .* match the rest of the line
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const static regex slashSlashCommentsRegex(R"regex([\t ]*\/\/.*)regex");
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// Star comments:
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// [\t ]* check for tabs and spaces up until
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// \/\* the characters '/' + '*'
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// [\w\W]*? match any character, including newlines. The ? makes it "non-greedy"
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// \*\/ stop the match at the first occurrence of '*' + '/'
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const static regex starCommentsRegex(R"regex([\t ]*\/\*[\w\W]*?\*\/)regex");
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// Empty lines:
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// (\n|\r\n)+ match 1 or more newlines (either linux or Windows-style)
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// The capture group will only capture a single newline sequence.
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const static regex emptyLinesRegex(R"regex((\n|\r\n)+)regex");
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// Indentation:
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// (^|\n) match the beginning of the file, or a newline character (C++14 does not support
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// the multiline option, unfortunately)
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// [ \t]+ match at least one leading space or tab character
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const static regex indentationRegex(R"regex((^|\n)[ \t]+)regex");
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std::string minifyGlsl(const std::string& glsl, GlslMinifyOptions options) noexcept {
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std::string minified = glsl;
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if (options & GlslMinifyOptions::STRIP_COMMENTS) {
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minified = regex_replace(minified, slashSlashCommentsRegex, "");
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minified = regex_replace(minified, starCommentsRegex, "");
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}
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if (options & GlslMinifyOptions::STRIP_EMPTY_LINES) {
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// Replace the group of newlines with a single newline, which is in the first capture group.
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minified = regex_replace(minified, emptyLinesRegex, "$1");
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}
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if (options & GlslMinifyOptions::STRIP_INDENTATION) {
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// Replace the indentation with whatever was captured in the first capture group, which will
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// either be a newline or nothing at all (in the case of the first line).
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// We do this to preserve newlines when stripping indentation.
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minified = regex_replace(minified, indentationRegex, "$1");
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}
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return minified;
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}
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} // namespace glslminifier
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