| //===- LineIterator.cpp - Implementation of line iteration ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/LineIterator.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| |
| using namespace llvm; |
| |
| line_iterator::line_iterator(const MemoryBuffer &Buffer, char CommentMarker) |
| : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr), |
| CommentMarker(CommentMarker), LineNumber(1), |
| CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr, |
| 0) { |
| // Ensure that if we are constructed on a non-empty memory buffer that it is |
| // a null terminated buffer. |
| if (Buffer.getBufferSize()) { |
| assert(Buffer.getBufferEnd()[0] == '\0'); |
| advance(); |
| } |
| } |
| |
| void line_iterator::advance() { |
| assert(Buffer && "Cannot advance past the end!"); |
| |
| const char *Pos = CurrentLine.end(); |
| assert(Pos == Buffer->getBufferStart() || *Pos == '\n' || *Pos == '\0'); |
| |
| if (CommentMarker == '\0') { |
| // If we're not stripping comments, this is simpler. |
| size_t Blanks = 0; |
| while (Pos[Blanks] == '\n') |
| ++Blanks; |
| Pos += Blanks; |
| LineNumber += Blanks; |
| } else { |
| // Skip comments and count line numbers, which is a bit more complex. |
| for (;;) { |
| if (*Pos == CommentMarker) |
| do { |
| ++Pos; |
| } while (*Pos != '\0' && *Pos != '\n'); |
| if (*Pos != '\n') |
| break; |
| ++Pos; |
| ++LineNumber; |
| } |
| } |
| |
| if (*Pos == '\0') { |
| // We've hit the end of the buffer, reset ourselves to the end state. |
| Buffer = nullptr; |
| CurrentLine = StringRef(); |
| return; |
| } |
| |
| // Measure the line. |
| size_t Length = 0; |
| do { |
| ++Length; |
| } while (Pos[Length] != '\0' && Pos[Length] != '\n'); |
| |
| CurrentLine = StringRef(Pos, Length); |
| } |