Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/err.cc

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "tools/gn/err.h"
-
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "tools/gn/filesystem_utils.h"
-#include "tools/gn/input_file.h"
-#include "tools/gn/parse_tree.h"
-#include "tools/gn/standard_out.h"
-#include "tools/gn/tokenizer.h"
-#include "tools/gn/value.h"
-
-namespace {
-
-std::string GetNthLine(const base::StringPiece& data, int n) {
-  size_t line_off = Tokenizer::ByteOffsetOfNthLine(data, n);
-  size_t end = line_off + 1;
-  while (end < data.size() && !Tokenizer::IsNewline(data, end))
-    end++;
-  return data.substr(line_off, end - line_off).as_string();
-}
-
-void FillRangeOnLine(const LocationRange& range, int line_number,
-                     std::string* line) {
-  // Only bother if the range's begin or end overlaps the line. If the entire
-  // line is highlighted as a result of this range, it's not very helpful.
-  if (range.begin().line_number() != line_number &&
-      range.end().line_number() != line_number)
-    return;
-
-  // Watch out, the char offsets in the location are 1-based, so we have to
-  // subtract 1.
-  int begin_char;
-  if (range.begin().line_number() < line_number)
-    begin_char = 0;
-  else
-    begin_char = range.begin().char_offset() - 1;
-
-  int end_char;
-  if (range.end().line_number() > line_number)
-    end_char = line->size();  // Ending is non-inclusive.
-  else
-    end_char = range.end().char_offset() - 1;
-
-  CHECK(end_char >= begin_char);
-  CHECK(begin_char >= 0 && begin_char <= static_cast<int>(line->size()));
-  CHECK(end_char >= 0 && end_char <= static_cast<int>(line->size()));
-  for (int i = begin_char; i < end_char; i++)
-    line->at(i) = '-';
-}
-
-// The line length is used to clip the maximum length of the markers we'll
-// make if the error spans more than one line (like unterminated literals).
-void OutputHighlighedPosition(const Location& location,
-                              const Err::RangeList& ranges,
-                              size_t line_length) {
-  // Make a buffer of the line in spaces.
-  std::string highlight;
-  highlight.resize(line_length);
-  for (size_t i = 0; i < line_length; i++)
-    highlight[i] = ' ';
-
-  // Highlight all the ranges on the line.
-  for (size_t i = 0; i < ranges.size(); i++)
-    FillRangeOnLine(ranges[i], location.line_number(), &highlight);
-
-  // Allow the marker to be one past the end of the line for marking the end.
-  highlight.push_back(' ');
-  CHECK(location.char_offset() - 1 >= 0 &&
-        location.char_offset() - 1 < static_cast<int>(highlight.size()));
-  highlight[location.char_offset() - 1] = '^';
-
-  // Trim unused spaces from end of line.
-  while (!highlight.empty() && highlight[highlight.size() - 1] == ' ')
-    highlight.resize(highlight.size() - 1);
-
-  highlight += "\n";
-  OutputString(highlight, DECORATION_BLUE);
-}
-
-}  // namespace
-
-Err::Err() : has_error_(false) {
-}
-
-Err::Err(const Location& location,
-         const std::string& msg,
-         const std::string& help)
-    : has_error_(true),
-      location_(location),
-      message_(msg),
-      help_text_(help) {
-}
-
-Err::Err(const LocationRange& range,
-         const std::string& msg,
-         const std::string& help)
-    : has_error_(true),
-      location_(range.begin()),
-      message_(msg),
-      help_text_(help) {
-  ranges_.push_back(range);
-}
-
-Err::Err(const Token& token,
-         const std::string& msg,
-         const std::string& help)
-    : has_error_(true),
-      location_(token.location()),
-      message_(msg),
-      help_text_(help) {
-  ranges_.push_back(token.range());
-}
-
-Err::Err(const ParseNode* node,
-         const std::string& msg,
-         const std::string& help_text)
-    : has_error_(true),
-      message_(msg),
-      help_text_(help_text) {
-  // Node will be null in certain tests.
-  if (node) {
-    LocationRange range = node->GetRange();
-    location_ = range.begin();
-    ranges_.push_back(range);
-  }
-}
-
-Err::Err(const Value& value,
-         const std::string msg,
-         const std::string& help_text)
-    : has_error_(true),
-      message_(msg),
-      help_text_(help_text) {
-  if (value.origin()) {
-    LocationRange range = value.origin()->GetRange();
-    location_ = range.begin();
-    ranges_.push_back(range);
-  }
-}
-
-Err::~Err() {
-}
-
-void Err::PrintToStdout() const {
-  InternalPrintToStdout(false);
-}
-
-void Err::AppendSubErr(const Err& err) {
-  sub_errs_.push_back(err);
-}
-
-void Err::InternalPrintToStdout(bool is_sub_err) const {
-  DCHECK(has_error_);
-
-  if (!is_sub_err)
-    OutputString("ERROR ", DECORATION_RED);
-
-  // File name and location.
-  const InputFile* input_file = location_.file();
-  std::string loc_str;
-  if (input_file) {
-    std::string path8;
-    path8.assign(input_file->name().value());
-
-    if (is_sub_err)
-      loc_str = "See ";
-    else
-      loc_str = "at ";
-    loc_str += path8 + ": " +
-        base::IntToString(location_.line_number()) + ":" +
-        base::IntToString(location_.char_offset()) + ": ";
-  }
-  OutputString(loc_str + message_ + "\n");
-
-  // Quoted line.
-  if (input_file) {
-    std::string line = GetNthLine(input_file->contents(),
-                                  location_.line_number());
-    if (!ContainsOnlyWhitespaceASCII(line)) {
-      OutputString(line + "\n", DECORATION_BOLD);
-      OutputHighlighedPosition(location_, ranges_, line.size());
-    }
-  }
-
-  // Optional help text.
-  if (!help_text_.empty())
-    OutputString(help_text_ + "\n");
-
-  // Sub errors.
-  for (size_t i = 0; i < sub_errs_.size(); i++)
-    sub_errs_[i].InternalPrintToStdout(true);
-}