1 files changed, 87 insertions, 0 deletions
diff --git a/clang-r353983e/include/llvm/Support/LineIterator.h b/clang-r353983e/include/llvm/Support/LineIterator.h
new file mode 100644
index 00000000..c9f10ca9
--- /dev/null
+++ b/clang-r353983e/include/llvm/Support/LineIterator.h
@@ -0,0 +1,87 @@
+//===- LineIterator.h - Iterator to read a text buffer's lines --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_LINEITERATOR_H
+#define LLVM_SUPPORT_LINEITERATOR_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/DataTypes.h"
+#include <iterator>
+
+namespace llvm {
+
+class MemoryBuffer;
+
+/// A forward iterator which reads 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 is aware of what line number it is currently processing. It
+/// strips blank lines by default, and comment lines given a 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> {
+  const MemoryBuffer *Buffer;
+  char CommentMarker;
+  bool SkipBlanks;
+
+  unsigned LineNumber;
+  StringRef CurrentLine;
+
+public:
+  /// Default construct an "end" iterator.
+  line_iterator() : Buffer(nullptr) {}
+
+  /// Construct a new iterator around some memory buffer.
+  explicit line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks = true,
+                         char CommentMarker = '\0');
+
+  /// Return true if we've reached EOF or are an "end" iterator.
+  bool is_at_eof() const { return !Buffer; }
+
+  /// Return true if we're an "end" iterator or have reached EOF.
+  bool is_at_end() const { return is_at_eof(); }
+
+  /// Return the current line number. May return any number at EOF.
+  int64_t line_number() const { return LineNumber; }
+
+  /// Advance to the next (non-empty, non-comment) line.
+  line_iterator &operator++() {
+    advance();
+    return *this;
+  }
+  line_iterator operator++(int) {
+    line_iterator tmp(*this);
+    advance();
+    return tmp;
+  }
+
+  /// Get the current line as a \c StringRef.
+  StringRef operator*() const { return CurrentLine; }
+  const 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:
+  /// Advance the iterator to the next line.
+  void advance();
+};
+}
+
+#endif