1 //===- LineIterator.cpp - Implementation of line iteration ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/Support/LineIterator.h"
11 #include "llvm/Support/MemoryBuffer.h"
15 line_iterator::line_iterator(const MemoryBuffer &Buffer, char CommentMarker)
16 : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
17 CommentMarker(CommentMarker), LineNumber(1),
18 CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
20 // Ensure that if we are constructed on a non-empty memory buffer that it is
21 // a null terminated buffer.
22 if (Buffer.getBufferSize()) {
23 assert(Buffer.getBufferEnd()[0] == '\0');
28 void line_iterator::advance() {
29 assert(Buffer && "Cannot advance past the end!");
31 const char *Pos = CurrentLine.end();
32 assert(Pos == Buffer->getBufferStart() || *Pos == '\n' || *Pos == '\0');
34 if (CommentMarker == '\0') {
35 // If we're not stripping comments, this is simpler.
37 while (Pos[Blanks] == '\n')
42 // Skip comments and count line numbers, which is a bit more complex.
44 if (*Pos == CommentMarker)
47 } while (*Pos != '\0' && *Pos != '\n');
56 // We've hit the end of the buffer, reset ourselves to the end state.
58 CurrentLine = StringRef();
66 } while (Pos[Length] != '\0' && Pos[Length] != '\n');
68 CurrentLine = StringRef(Pos, Length);