1 files changed, 69 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/LineIterator.cpp b/contrib/llvm/lib/Support/LineIterator.cpp
new file mode 100644
index 0000000..947a8fb
--- /dev/null
+++ b/contrib/llvm/lib/Support/LineIterator.cpp
@@ -0,0 +1,69 @@
+//===- 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);
+}