105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
/*
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* Copyright 2021 Google LLC.
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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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*/
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#ifndef SKSL_POSITION
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#define SKSL_POSITION
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#include "include/core/SkTypes.h"
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#include <cstdint>
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#include <string_view>
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namespace SkSL {
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class Position {
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public:
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Position()
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: fStartOffset(-1)
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, fLength(0) {}
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static Position Range(int startOffset, int endOffset) {
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SkASSERT(startOffset <= endOffset);
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SkASSERT(startOffset <= 0xFFFFFF);
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int length = endOffset - startOffset;
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Position result;
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result.fStartOffset = startOffset;
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result.fLength = length <= 0xFF ? length : 0xFF;
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return result;
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}
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bool valid() const {
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return fStartOffset != -1;
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}
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int line(std::string_view source) const;
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int startOffset() const {
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SkASSERT(this->valid());
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return fStartOffset;
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}
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int endOffset() const {
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SkASSERT(this->valid());
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return fStartOffset + fLength;
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}
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// Returns the position from this through, and including the entirety of, end.
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Position rangeThrough(Position end) const {
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if (fStartOffset == -1 || end.fStartOffset == -1) {
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return *this;
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}
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SkASSERTF(this->startOffset() <= end.startOffset() && this->endOffset() <= end.endOffset(),
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"Invalid range: (%d-%d) - (%d-%d)\n", this->startOffset(), this->endOffset(),
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end.startOffset(), end.endOffset());
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return Range(this->startOffset(), end.endOffset());
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}
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// Returns a position representing the character immediately after this position
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Position after() const {
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int endOffset = this->endOffset();
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return Range(endOffset, endOffset + 1);
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}
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bool operator==(const Position& other) const {
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return fStartOffset == other.fStartOffset && fLength == other.fLength;
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}
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bool operator!=(const Position& other) const {
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return !(*this == other);
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}
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bool operator>(const Position& other) const {
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return fStartOffset > other.fStartOffset;
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}
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bool operator>=(const Position& other) const {
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return fStartOffset >= other.fStartOffset;
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}
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bool operator<(const Position& other) const {
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return fStartOffset < other.fStartOffset;
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}
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bool operator<=(const Position& other) const {
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return fStartOffset <= other.fStartOffset;
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}
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private:
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int32_t fStartOffset : 24;
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uint32_t fLength : 8;
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};
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struct ForLoopPositions {
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Position initPosition = Position();
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Position conditionPosition = Position();
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Position nextPosition = Position();
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};
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} // namespace SkSL
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#endif
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