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      1 /*
      2  * Copyright (C) 2011, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "core/inspector/InspectorStyleTextEditor.h"
     27 
     28 #include "core/css/CSSPropertySourceData.h"
     29 #include "core/html/parser/HTMLParserIdioms.h"
     30 #include "core/inspector/InspectorStyleSheet.h"
     31 
     32 namespace blink {
     33 
     34 InspectorStyleTextEditor::InspectorStyleTextEditor(WillBeHeapVector<InspectorStyleProperty>* allProperties, const String& styleText, const SourceRange& styleRange, const NewLineAndWhitespace& format)
     35     : m_allProperties(allProperties)
     36     , m_styleText(styleText)
     37     , m_styleRange(styleRange)
     38     , m_format(format)
     39 {
     40 }
     41 
     42 void InspectorStyleTextEditor::insertProperty(unsigned index, const String& propertyText)
     43 {
     44     unsigned styleBodyLength = m_styleRange.length();
     45     long propertyStart = 0;
     46 
     47     bool insertLast = true;
     48     if (index < m_allProperties->size()) {
     49         const InspectorStyleProperty& property = m_allProperties->at(index);
     50         if (property.hasSource) {
     51             propertyStart = property.sourceData.range.start - m_styleRange.start;
     52             // If inserting before a disabled property, it should be shifted, too.
     53             insertLast = false;
     54         }
     55     }
     56 
     57     bool insertFirstInSource = !m_allProperties->size() || !m_allProperties->at(0).hasSource;
     58     bool insertLastInSource = true;
     59     for (unsigned i = index, size = m_allProperties->size(); i < size; ++i) {
     60         const InspectorStyleProperty& property = m_allProperties->at(i);
     61         if (property.hasSource) {
     62             insertLastInSource = false;
     63             break;
     64         }
     65     }
     66 
     67     String textToSet = propertyText;
     68 
     69     int formattingPrependOffset = 0;
     70     if (insertLast && !insertFirstInSource) {
     71         propertyStart = styleBodyLength;
     72         if (propertyStart && textToSet.length()) {
     73             long curPos = propertyStart - 1; // The last position of style declaration, since propertyStart points past one.
     74             while (curPos && isHTMLSpace<UChar>(m_styleText[curPos]))
     75                 --curPos;
     76             if (curPos) {
     77                 bool terminated = m_styleText[curPos] == ';' || (m_styleText[curPos] == '/' && m_styleText[curPos - 1] == '*');
     78                 if (!terminated) {
     79                     // Prepend a ";" to the property text if appending to a style declaration where
     80                     // the last property has no trailing ";".
     81                     textToSet.insert(";", 0);
     82                     formattingPrependOffset = 1;
     83                 }
     84             }
     85         }
     86     }
     87 
     88     const String& formatLineFeed = m_format.first;
     89     const String& formatPropertyPrefix = m_format.second;
     90     if (insertLastInSource) {
     91         long formatPropertyPrefixLength = formatPropertyPrefix.length();
     92         if (!formattingPrependOffset && (propertyStart < formatPropertyPrefixLength || m_styleText.substring(propertyStart - formatPropertyPrefixLength, formatPropertyPrefixLength) != formatPropertyPrefix)) {
     93             textToSet.insert(formatPropertyPrefix, formattingPrependOffset);
     94             if (!propertyStart || !isHTMLLineBreak(m_styleText[propertyStart - 1]))
     95                 textToSet.insert(formatLineFeed, formattingPrependOffset);
     96         }
     97         if (!isHTMLLineBreak(m_styleText[propertyStart]))
     98             textToSet = textToSet + formatLineFeed;
     99     } else {
    100         String fullPrefix = formatLineFeed + formatPropertyPrefix;
    101         long fullPrefixLength = fullPrefix.length();
    102         textToSet = textToSet + fullPrefix;
    103         if (insertFirstInSource && (propertyStart < fullPrefixLength || m_styleText.substring(propertyStart - fullPrefixLength, fullPrefixLength) != fullPrefix))
    104             textToSet.insert(fullPrefix, formattingPrependOffset);
    105     }
    106     m_styleText.insert(textToSet, propertyStart);
    107 }
    108 
    109 void InspectorStyleTextEditor::replaceProperty(unsigned index, const String& newText)
    110 {
    111     ASSERT_WITH_SECURITY_IMPLICATION(index < m_allProperties->size());
    112     internalReplaceProperty(m_allProperties->at(index), newText);
    113 }
    114 
    115 void InspectorStyleTextEditor::internalReplaceProperty(const InspectorStyleProperty& property, const String& newText)
    116 {
    117     const SourceRange& range = property.sourceData.range;
    118     long replaceRangeStart = range.start - m_styleRange.start;
    119     long replaceRangeEnd = range.end - m_styleRange.start;
    120     long newTextLength = newText.length();
    121     String finalNewText = newText;
    122 
    123     // Removing a property - remove preceding prefix.
    124     String fullPrefix = m_format.first + m_format.second;
    125     long fullPrefixLength = fullPrefix.length();
    126     if (!newTextLength && fullPrefixLength) {
    127         if (replaceRangeStart >= fullPrefixLength && m_styleText.substring(replaceRangeStart - fullPrefixLength, fullPrefixLength) == fullPrefix)
    128             replaceRangeStart -= fullPrefixLength;
    129     } else if (newTextLength) {
    130         if (isHTMLLineBreak(newText[newTextLength - 1])) {
    131             // Coalesce newlines of the original and new property values (to avoid a lot of blank lines while incrementally applying property values).
    132             bool foundNewline = false;
    133             bool isLastNewline = false;
    134             int i;
    135             int textLength = m_styleText.length();
    136             for (i = replaceRangeEnd; i < textLength && isSpaceOrNewline(m_styleText[i]); ++i) {
    137                 isLastNewline = isHTMLLineBreak(m_styleText[i]);
    138                 if (isLastNewline)
    139                     foundNewline = true;
    140                 else if (foundNewline && !isLastNewline) {
    141                     replaceRangeEnd = i;
    142                     break;
    143                 }
    144             }
    145             if (foundNewline && isLastNewline)
    146                 replaceRangeEnd = i;
    147         }
    148 
    149         if (fullPrefixLength > replaceRangeStart || m_styleText.substring(replaceRangeStart - fullPrefixLength, fullPrefixLength) != fullPrefix)
    150             finalNewText.insert(fullPrefix, 0);
    151     }
    152 
    153     int replacedLength = replaceRangeEnd - replaceRangeStart;
    154     m_styleText.replace(replaceRangeStart, replacedLength, finalNewText);
    155 }
    156 
    157 } // namespace blink
    158 
    159