Add UI for RuntimeErrors in the ErrorConsole

extensions/browser/file_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 "extensions/browser/file_highlighter.h"
+
 #include <stack>
 
-#include "extensions/browser/manifest_highlighter.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
 
 namespace extensions {
 
 namespace {
 
+// Keys for a highlighted dictionary.
+const char kBeforeHighlightKey[] = "beforeHighlight";
+const char kHighlightKey[] = "highlight";
+const char kAfterHighlightKey[] = "afterHighlight";
+
 // 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] == '"')
@@ skipping 38 matching lines @@
       stack.push('}');
     else if (!stack.empty() && c == stack.top())
       stack.pop();
     CommentSafeIncrement(str, index);
     c = str[*index];
   } while (!stack.empty() && *index < end);
 }
 
 }  // namespace
 
+FileHighlighter::FileHighlighter(const std::string& contents)
+    : contents_(contents), start_(0u), end_(contents_.size()) {
+}
+
+FileHighlighter::~FileHighlighter() {
+}
+
+std::string FileHighlighter::GetBeforeFeature() const {
+  return contents_.substr(0, start_);
+}
+
+std::string FileHighlighter::GetFeature() const {
+  return contents_.substr(start_, end_ - start_);
+}
+
+std::string FileHighlighter::GetAfterFeature() const {
+  return contents_.substr(end_);
+}
+
+void FileHighlighter::SetHighlightedRegions(base::DictionaryValue* dict) const {
+  std::string before_feature = GetBeforeFeature();
+  if (!before_feature.empty())
+    dict->SetString(kBeforeHighlightKey, base::UTF8ToUTF16(before_feature));
+
+  std::string feature = GetFeature();
+  if (!feature.empty())
+    dict->SetString(kHighlightKey, base::UTF8ToUTF16(feature));
+
+  std::string after_feature = GetAfterFeature();
+  if (!after_feature.empty())
+    dict->SetString(kAfterHighlightKey, base::UTF8ToUTF16(after_feature));
+}
+
 ManifestHighlighter::ManifestHighlighter(const std::string& manifest,
                                          const std::string& key,
                                          const std::string& specific)
-    : manifest_(manifest),
-      start_(manifest_.find('{') + 1),
-      end_(manifest_.rfind('}')) {
+    : FileHighlighter(manifest) {
+  start_ = contents_.find('{') + 1;
+  end_ = contents_.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);
+    size_t trim = contents_.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_];
+    c = contents_[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) {
+      QuoteIncrement(contents_, &quote_end);
+      if (contents_.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) {
+    } else if (contents_.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_);
+      ChunkIncrement(contents_, &start_, end_);
     } else {
-      CommentSafeIncrement(manifest_, &start_);
+      CommentSafeIncrement(contents_, &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];
+    c = contents_[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_);
+      ChunkIncrement(contents_, &local_start, end_);
     else
-      CommentSafeIncrement(manifest_, &local_start);
+      CommentSafeIncrement(contents_, &local_start);
   }
 }
 
+SourceHighlighter::SourceHighlighter(const std::string& contents,
+                                     size_t line_number)
+    : FileHighlighter(contents) {
+  Parse(line_number);
+}
+
+SourceHighlighter::~SourceHighlighter() {
+}
+
+void SourceHighlighter::Parse(size_t line_number) {
+  for (size_t i = 1; i < line_number; ++i)
+    start_ = contents_.find('\n', start_) + 1;

[Finnur, 2013/09/09 09:15:56]

The +1 makes the check for npos on line 213 invalid, no? Have you tried what
happens if the file has no linebreaks?

[Devlin, 2013/09/09 16:56:03]

Whoops!  It'll actually work, given valid input (the only valid line number for
a file with no linebreaks is 1, so we never enter the for-loop at 206, and we
get the entire file).  But fixed in https://codereview.chromium.org/23875013/. 
Thanks! :)

+  end_ = contents_.find('\n', start_);
+
+  // If we went off the end of the string (i.e., the line number was invalid),
+  // then move start and end to the end of the string, so that the highlighted
+  // portion is empty.
+  start_ = start_ == std::string::npos ? contents_.size() : start_;
+  end_ = end_ == std::string::npos ? contents_.size() : end_;
+}
+
 }  // namespace extensions