Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/lib/Support/LineIterator.cpp

@@ -1,94 +0,0 @@
-//===- 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;
-
-static bool isAtLineEnd(const char *P) {
-  if (*P == '\n')
-    return true;
-  if (*P == '\r' && *(P + 1) == '\n')
-    return true;
-  return false;
-}
-
-static bool skipIfAtLineEnd(const char *&P) {
-  if (*P == '\n') {
-    ++P;
-    return true;
-  }
-  if (*P == '\r' && *(P + 1) == '\n') {
-    P += 2;
-    return true;
-  }
-  return false;
-}
-
-line_iterator::line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks,
-                             char CommentMarker)
-    : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
-      CommentMarker(CommentMarker), SkipBlanks(SkipBlanks), 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');
-    // Make sure we don't skip a leading newline if we're keeping blanks
-    if (SkipBlanks || !isAtLineEnd(Buffer.getBufferStart()))
-      advance();
-  }
-}
-
-void line_iterator::advance() {
-  assert(Buffer && "Cannot advance past the end!");
-
-  const char *Pos = CurrentLine.end();
-  assert(Pos == Buffer->getBufferStart() || isAtLineEnd(Pos) || *Pos == '\0');
-
-  if (skipIfAtLineEnd(Pos))
-    ++LineNumber;
-  if (!SkipBlanks && isAtLineEnd(Pos)) {
-    // Nothing to do for a blank line.
-  } else if (CommentMarker == '\0') {
-    // If we're not stripping comments, this is simpler.
-    while (skipIfAtLineEnd(Pos))
-      ++LineNumber;
-  } else {
-    // Skip comments and count line numbers, which is a bit more complex.
-    for (;;) {
-      if (isAtLineEnd(Pos) && !SkipBlanks)
-        break;
-      if (*Pos == CommentMarker)
-        do {
-          ++Pos;
-        } while (*Pos != '\0' && !isAtLineEnd(Pos));
-      if (!skipIfAtLineEnd(Pos))
-        break;
-      ++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;
-  while (Pos[Length] != '\0' && !isAtLineEnd(&Pos[Length])) {
-    ++Length;
-  }
-
-  CurrentLine = StringRef(Pos, Length);
-}