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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
//===- LineIterator.cpp - Implementation of line iteration ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/LineIterator.h"
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#include "llvm/Support/MemoryBuffer.h"
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using namespace llvm;
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static bool isAtLineEnd(const char *P) {
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if (*P == '\n')
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return true;
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if (*P == '\r' && *(P + 1) == '\n')
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return true;
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return false;
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}
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static bool skipIfAtLineEnd(const char *&P) {
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if (*P == '\n') {
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++P;
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return true;
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}
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if (*P == '\r' && *(P + 1) == '\n') {
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P += 2;
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return true;
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}
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return false;
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}
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line_iterator::line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks,
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char CommentMarker)
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: Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
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CommentMarker(CommentMarker), SkipBlanks(SkipBlanks), LineNumber(1),
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CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
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0) {
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// Ensure that if we are constructed on a non-empty memory buffer that it is
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// a null terminated buffer.
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if (Buffer.getBufferSize()) {
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assert(Buffer.getBufferEnd()[0] == '\0');
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// Make sure we don't skip a leading newline if we're keeping blanks
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if (SkipBlanks || !isAtLineEnd(Buffer.getBufferStart()))
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advance();
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}
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}
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void line_iterator::advance() {
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assert(Buffer && "Cannot advance past the end!");
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const char *Pos = CurrentLine.end();
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assert(Pos == Buffer->getBufferStart() || isAtLineEnd(Pos) || *Pos == '\0');
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if (skipIfAtLineEnd(Pos))
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++LineNumber;
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if (!SkipBlanks && isAtLineEnd(Pos)) {
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// Nothing to do for a blank line.
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} else if (CommentMarker == '\0') {
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// If we're not stripping comments, this is simpler.
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while (skipIfAtLineEnd(Pos))
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++LineNumber;
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} else {
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// Skip comments and count line numbers, which is a bit more complex.
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for (;;) {
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if (isAtLineEnd(Pos) && !SkipBlanks)
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break;
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if (*Pos == CommentMarker)
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do {
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++Pos;
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} while (*Pos != '\0' && !isAtLineEnd(Pos));
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if (!skipIfAtLineEnd(Pos))
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break;
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++LineNumber;
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}
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}
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if (*Pos == '\0') {
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// We've hit the end of the buffer, reset ourselves to the end state.
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Buffer = nullptr;
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CurrentLine = StringRef();
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return;
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}
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// Measure the line.
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size_t Length = 0;
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while (Pos[Length] != '\0' && !isAtLineEnd(&Pos[Length])) {
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++Length;
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}
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CurrentLine = StringRef(Pos, Length);
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}
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