158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Copyright 2013 The Chromium Authors. All rights reserved. 258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// found in the LICENSE file. 458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "extensions/browser/file_highlighter.h" 658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include <stack> 858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/strings/utf_string_conversions.h" 1058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/values.h" 1158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)namespace extensions { 1358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)namespace { 1558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Keys for a highlighted dictionary. 1758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)const char kBeforeHighlightKey[] = "beforeHighlight"; 1858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)const char kHighlightKey[] = "highlight"; 1958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)const char kAfterHighlightKey[] = "afterHighlight"; 2058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 2158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Increment |index| to the position of the next quote ('"') in |str|, skipping 2258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// over any escaped quotes. If no next quote is found, |index| is set to 2358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// std::string::npos. Assumes |index| currently points to a quote. 2458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void QuoteIncrement(const std::string& str, size_t* index) { 2558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t i = *index + 1; // Skip over the first quote. 2658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) bool found = false; 2758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (!found && i < str.size()) { 2858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (str[i] == '\\') 2958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) i += 2; // if we find an escaped character, skip it. 3058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else if (str[i] == '"') 3158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) found = true; 3258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else 3358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ++i; 3458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 3558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) *index = found ? i : std::string::npos; 3658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 3758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 3858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Increment |index| by one if the next character is not a comment. Increment 3958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// index until the end of the comment if it is a comment. 4058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void CommentSafeIncrement(const std::string& str, size_t* index) { 4158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t i = *index; 4258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (str[i] == '/' && i + 1 < str.size()) { 4358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Eat a single-line comment. 4458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (str[i + 1] == '/') { 4558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) i += 2; // Eat the '//'. 4658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (i < str.size() && str[i] != '\n' && str[i] != '\r') 4758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ++i; 4858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else if (str[i + 1] == '*') { // Eat a multi-line comment. 4958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) i += 3; // Advance to the first possible comment end. 5058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (i < str.size() && !(str[i - 1] == '*' && str[i] == '/')) 5158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ++i; 5258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 5358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 5458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) *index = i + 1; 5558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 5658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 5758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Increment index until the end of the current "chunk"; a "chunk" is a JSON- 5858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// style list, object, or string literal, without exceeding |end|. Assumes 5958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// |index| currently points to a chunk's starting character ('{', '[', or '"'). 6058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void ChunkIncrement(const std::string& str, size_t* index, size_t end) { 6158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) char c = str[*index]; 6258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::stack<char> stack; 6358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) do { 6458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (c == '"') 6558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) QuoteIncrement(str, index); 6658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else if (c == '[') 6758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) stack.push(']'); 6858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else if (c == '{') 6958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) stack.push('}'); 7058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else if (!stack.empty() && c == stack.top()) 7158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) stack.pop(); 7258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) CommentSafeIncrement(str, index); 7358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) c = str[*index]; 7458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } while (!stack.empty() && *index < end); 7558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 7658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 7758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} // namespace 7858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 7958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)FileHighlighter::FileHighlighter(const std::string& contents) 8058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) : contents_(contents), start_(0u), end_(contents_.size()) { 8158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 8258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 8358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)FileHighlighter::~FileHighlighter() { 8458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 8558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 8658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)std::string FileHighlighter::GetBeforeFeature() const { 8758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return contents_.substr(0, start_); 8858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 8958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 9058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)std::string FileHighlighter::GetFeature() const { 9158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return contents_.substr(start_, end_ - start_); 9258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 9358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 9458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)std::string FileHighlighter::GetAfterFeature() const { 9558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return contents_.substr(end_); 9658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 9758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 9858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void FileHighlighter::SetHighlightedRegions(base::DictionaryValue* dict) const { 9958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string before_feature = GetBeforeFeature(); 10058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!before_feature.empty()) 10158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) dict->SetString(kBeforeHighlightKey, base::UTF8ToUTF16(before_feature)); 10258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 10358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string feature = GetFeature(); 10458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!feature.empty()) 10558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) dict->SetString(kHighlightKey, base::UTF8ToUTF16(feature)); 10658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 10758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string after_feature = GetAfterFeature(); 10858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!after_feature.empty()) 10958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) dict->SetString(kAfterHighlightKey, base::UTF8ToUTF16(after_feature)); 11058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 11158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 11258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)ManifestHighlighter::ManifestHighlighter(const std::string& manifest, 11358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& key, 11458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& specific) 11558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) : FileHighlighter(manifest) { 11658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = contents_.find('{') + 1; 11758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) end_ = contents_.rfind('}'); 11858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) Parse(key, specific); 11958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 12058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 12158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)ManifestHighlighter::~ManifestHighlighter() { 12258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 12358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 12458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 12558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void ManifestHighlighter::Parse(const std::string& key, 12658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& specific) { 12758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // First, try to find the bounds of the full key. 12858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (FindBounds(key, true) /* enforce at top level */ ) { 12958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If we succeed, and we have a specific location, find the bounds of the 13058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // specific. 13158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!specific.empty()) 13258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) FindBounds(specific, false /* don't enforce at top level */ ); 13358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 13458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // We may have found trailing whitespace. Don't use base::TrimWhitespace, 13558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // because we want to keep any whitespace we find - just not highlight it. 13658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t trim = contents_.find_last_not_of(" \t\n\r", end_ - 1); 13758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (trim < end_ && trim > start_) 13858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) end_ = trim + 1; 13958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else { 14058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If we fail, then we set start to end so that the highlighted portion is 14158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // empty. 14258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = end_; 14358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 14458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 14558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 14658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)bool ManifestHighlighter::FindBounds(const std::string& feature, 14758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) bool enforce_at_top_level) { 14858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) char c = '\0'; 14958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (start_ < end_) { 15058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) c = contents_[start_]; 15158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (c == '"') { 15258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // The feature may be quoted. 15358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t quote_end = start_; 15458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) QuoteIncrement(contents_, "e_end); 15558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (contents_.substr(start_ + 1, quote_end - 1 - start_) == feature) { 15658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) FindBoundsEnd(feature, quote_end + 1); 15758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 15858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else { 15958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If it's not the feature, then we can skip the quoted section. 16058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = quote_end + 1; 16158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 16258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else if (contents_.substr(start_, feature.size()) == feature) { 16358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) FindBoundsEnd(feature, start_ + feature.size() + 1); 16458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 16558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else if (enforce_at_top_level && (c == '{' || c == '[')) { 16658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If we don't have to be at the top level, then we can skip any chunks 16758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // we find. 16858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ChunkIncrement(contents_, &start_, end_); 16958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else { 17058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) CommentSafeIncrement(contents_, &start_); 17158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 17258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 17358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 17458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 17558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 17658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void ManifestHighlighter::FindBoundsEnd(const std::string& feature, 17758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t local_start) { 17858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) char c = '\0'; 17958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (local_start < end_) { 18058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) c = contents_[local_start]; 18158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // We're done when we find a terminating character (i.e., either a comma or 18258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // an ending bracket. 18358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (c == ',' || c == '}' || c == ']') { 18458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) end_ = local_start; 18558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 18658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 18758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // We can skip any chunks we find, since we are looking for the end of the 18858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // current feature, and don't want to go any deeper. 18958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (c == '"' || c == '{' || c == '[') 19058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ChunkIncrement(contents_, &local_start, end_); 19158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else 19258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) CommentSafeIncrement(contents_, &local_start); 19358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 19458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 19558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 19658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)SourceHighlighter::SourceHighlighter(const std::string& contents, 19758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t line_number) 19858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) : FileHighlighter(contents) { 19958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) Parse(line_number); 20058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 20158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 20258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)SourceHighlighter::~SourceHighlighter() { 20358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 20458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 20558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)void SourceHighlighter::Parse(size_t line_number) { 20658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If line 0 is requested, highlight nothing. 20758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (line_number == 0) { 20858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = contents_.size(); 20958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 21058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 21158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 21258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) for (size_t i = 1; i < line_number; ++i) { 21358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = contents_.find('\n', start_); 21458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (start_ == std::string::npos) 21558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) break; 21658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ += 1; 21758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 21858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 21958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) end_ = contents_.find('\n', start_); 22058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 22158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // If we went off the end of the string (i.e., the line number was invalid), 22258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // then move start and end to the end of the string, so that the highlighted 22358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // portion is empty. 22458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) start_ = start_ == std::string::npos ? contents_.size() : start_; 22558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) end_ = end_ == std::string::npos ? contents_.size() : end_; 22658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 22758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 22858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} // namespace extensions 229