mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-07 14:33:15 +00:00
efa9416a21
Chandler voiced some concern with checking this in without some discussion first. Reverting for now. This reverts r203703, r203704, r203708, and 203709. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203723 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===- LineIterator.h - Iterator to read a text buffer's lines --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include <iterator>
|
|
|
|
namespace llvm {
|
|
|
|
class MemoryBuffer;
|
|
|
|
/// \brief A forward iterator which reads non-blank text lines from a buffer.
|
|
///
|
|
/// This class provides a forward iterator interface for reading one line at
|
|
/// a time from a buffer. When default constructed the iterator will be the
|
|
/// "end" iterator.
|
|
///
|
|
/// The iterator also is aware of what line number it is currently processing
|
|
/// and can strip comment lines given the comment-starting character.
|
|
///
|
|
/// Note that this iterator requires the buffer to be nul terminated.
|
|
class line_iterator
|
|
: public std::iterator<std::forward_iterator_tag, StringRef, ptrdiff_t> {
|
|
const MemoryBuffer *Buffer;
|
|
char CommentMarker;
|
|
|
|
unsigned LineNumber;
|
|
StringRef CurrentLine;
|
|
|
|
public:
|
|
/// \brief Default construct an "end" iterator.
|
|
line_iterator() : Buffer(0) {}
|
|
|
|
/// \brief Construct a new iterator around some memory buffer.
|
|
explicit line_iterator(const MemoryBuffer &Buffer, char CommentMarker = '\0');
|
|
|
|
/// \brief Return true if we've reached EOF or are an "end" iterator.
|
|
bool is_at_eof() const { return !Buffer; }
|
|
|
|
/// \brief Return true if we're an "end" iterator or have reached EOF.
|
|
bool is_at_end() const { return is_at_eof(); }
|
|
|
|
/// \brief Return the current line number. May return any number at EOF.
|
|
int64_t line_number() const { return LineNumber; }
|
|
|
|
/// \brief Advance to the next (non-empty, non-comment) line.
|
|
line_iterator &operator++() {
|
|
advance();
|
|
return *this;
|
|
}
|
|
|
|
/// \brief Get the current line as a \c StringRef.
|
|
StringRef operator*() const { return CurrentLine; }
|
|
|
|
friend bool operator==(const line_iterator &LHS, const line_iterator &RHS) {
|
|
return LHS.Buffer == RHS.Buffer &&
|
|
LHS.CurrentLine.begin() == RHS.CurrentLine.begin();
|
|
}
|
|
|
|
friend bool operator!=(const line_iterator &LHS, const line_iterator &RHS) {
|
|
return !(LHS == RHS);
|
|
}
|
|
|
|
private:
|
|
/// \brief Advance the iterator to the next line.
|
|
void advance();
|
|
};
|
|
}
|