Add UI for RuntimeErrors in the ErrorConsole

extensions/browser/manifest_highlighter.cc

-// Copyright 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 <stack>
-
-#include "extensions/browser/manifest_highlighter.h"
-
-namespace extensions {
-
-namespace {
-
-// Increment |index| to the position of the next quote ('"') in |str|, skipping
-// over any escaped quotes. If no next quote is found, |index| is set to
-// std::string::npos. Assumes |index| currently points to a quote.
-void QuoteIncrement(const std::string& str, size_t* index) {
-  size_t i = *index + 1;  // Skip over the first quote.
-  bool found = false;
-  while (!found && i < str.size()) {
-    if (str[i] == '\\')
-      i += 2;  // if we find an escaped character, skip it.
-    else if (str[i] == '"')
-      found = true;
-    else
-      ++i;
-  }
-  *index = found ? i : std::string::npos;
-}
-
-// Increment |index| by one if the next character is not a comment. Increment
-// index until the end of the comment if it is a comment.
-void CommentSafeIncrement(const std::string& str, size_t* index) {
-  size_t i = *index;
-  if (str[i] == '/' && i + 1 < str.size()) {
-    // Eat a single-line comment.
-    if (str[i + 1] == '/') {
-      i += 2;  // Eat the '//'.
-      while (i < str.size() && str[i] != '\n' && str[i] != '\r')
-        ++i;
-    } else if (str[i + 1] == '*') {  // Eat a multi-line comment.
-      i += 3;  // Advance to the first possible comment end.
-      while (i < str.size() && !(str[i - 1] == '*' && str[i] == '/'))
-        ++i;
-    }
-  }
-  *index = i + 1;
-}
-
-// Increment index until the end of the current "chunk"; a "chunk" is a JSON-
-// style list, object, or string literal, without exceeding |end|. Assumes
-// |index| currently points to a chunk's starting character ('{', '[', or '"').
-void ChunkIncrement(const std::string& str, size_t* index, size_t end) {
-  char c = str[*index];
-  std::stack<char> stack;
-  do {
-    if (c == '"')
-      QuoteIncrement(str, index);
-    else if (c == '[')
-      stack.push(']');
-    else if (c == '{')
-      stack.push('}');
-    else if (!stack.empty() && c == stack.top())
-      stack.pop();
-    CommentSafeIncrement(str, index);
-    c = str[*index];
-  } while (!stack.empty() && *index < end);
-}
-
-}  // namespace
-
-ManifestHighlighter::ManifestHighlighter(const std::string& manifest,
-                                         const std::string& key,
-                                         const std::string& specific)
-    : manifest_(manifest),
-      start_(manifest_.find('{') + 1),
-      end_(manifest_.rfind('}')) {
-  Parse(key, specific);
-}
-
-ManifestHighlighter::~ManifestHighlighter() {
-}
-
-std::string ManifestHighlighter::GetBeforeFeature() const {
-  return manifest_.substr(0, start_);
-}
-
-std::string ManifestHighlighter::GetFeature() const {
-  return manifest_.substr(start_, end_ - start_);
-}
-
-std::string ManifestHighlighter::GetAfterFeature() const {
-  return manifest_.substr(end_);
-}
-
-void ManifestHighlighter::Parse(const std::string& key,
-                                const std::string& specific) {
-  // First, try to find the bounds of the full key.
-  if (FindBounds(key, true) /* enforce at top level */ ) {
-    // If we succeed, and we have a specific location, find the bounds of the
-    // specific.
-    if (!specific.empty())
-      FindBounds(specific, false /* don't enforce at top level */ );
-
-    // We may have found trailing whitespace. Don't use base::TrimWhitespace,
-    // because we want to keep any whitespace we find - just not highlight it.
-    size_t trim = manifest_.find_last_not_of(" \t\n\r", end_ - 1);
-    if (trim < end_ && trim > start_)
-      end_ = trim + 1;
-  } else {
-    // If we fail, then we set start to end so that the highlighted portion is
-    // empty.
-    start_ = end_;
-  }
-}
-
-bool ManifestHighlighter::FindBounds(const std::string& feature,
-                                     bool enforce_at_top_level) {
-  char c = '\0';
-  while (start_ < end_) {
-    c = manifest_[start_];
-    if (c == '"') {
-      // The feature may be quoted.
-      size_t quote_end = start_;
-      QuoteIncrement(manifest_, &quote_end);
-      if (manifest_.substr(start_ + 1, quote_end - 1 - start_) == feature) {
-        FindBoundsEnd(feature, quote_end + 1);
-        return true;
-      } else {
-        // If it's not the feature, then we can skip the quoted section.
-        start_ = quote_end + 1;
-      }
-    } else if (manifest_.substr(start_, feature.size()) == feature) {
-        FindBoundsEnd(feature, start_ + feature.size() + 1);
-        return true;
-    } else if (enforce_at_top_level && (c == '{' || c == '[')) {
-      // If we don't have to be at the top level, then we can skip any chunks
-      // we find.
-      ChunkIncrement(manifest_, &start_, end_);
-    } else {
-      CommentSafeIncrement(manifest_, &start_);
-    }
-  }
-  return false;
-}
-
-void ManifestHighlighter::FindBoundsEnd(const std::string& feature,
-                                        size_t local_start) {
-  char c = '\0';
-  while (local_start < end_) {
-    c = manifest_[local_start];
-    // We're done when we find a terminating character (i.e., either a comma or
-    // an ending bracket.
-    if (c == ',' || c == '}' || c == ']') {
-      end_ = local_start;
-      return;
-    }
-    // We can skip any chunks we find, since we are looking for the end of the
-    // current feature, and don't want to go any deeper.
-    if (c == '"' || c == '{' || c == '[')
-      ChunkIncrement(manifest_, &local_start, end_);
-    else
-      CommentSafeIncrement(manifest_, &local_start);
-  }
-}
-
-}  // namespace extensions