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Diffstat (limited to '')
-rw-r--r-- | gfx/skia/skia/src/sksl/lex/NFA.cpp | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/lex/NFA.cpp b/gfx/skia/skia/src/sksl/lex/NFA.cpp new file mode 100644 index 0000000000..e73fc154d7 --- /dev/null +++ b/gfx/skia/skia/src/sksl/lex/NFA.cpp @@ -0,0 +1,44 @@ +/* + * Copyright 2017 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "src/sksl/lex/NFA.h" + +#include "src/sksl/lex/LexUtil.h" +#include <string> + +int NFA::match(std::string s) const { + std::vector<int> states = fStartStates; + for (size_t i = 0; i < s.size(); ++i) { + std::vector<int> next; + for (int id : states) { + if (fStates[id].accept(s[i])) { + for (int nextId : fStates[id].fNext) { + if (fStates[nextId].fKind != NFAState::kRemapped_Kind) { + next.push_back(nextId); + } else { + next.insert(next.end(), fStates[nextId].fData.begin(), + fStates[nextId].fData.end()); + } + } + } + } + if (!next.size()) { + return INVALID; + } + states = next; + } + int accept = INVALID; + for (int id : states) { + if (fStates[id].fKind == NFAState::kAccept_Kind) { + int result = fStates[id].fData[0]; + if (accept == INVALID || result < accept) { + accept = result; + } + } + } + return accept; +} |