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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 are
      6  * met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *
     11  * 2. Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
     17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
     20  * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "core/xml/XMLErrors.h"
     31 
     32 #include "HTMLNames.h"
     33 #include "SVGNames.h"
     34 #include "core/dom/Document.h"
     35 #include "core/dom/Element.h"
     36 #include "core/dom/Text.h"
     37 #include <wtf/text/WTFString.h>
     38 
     39 namespace WebCore {
     40 
     41 using namespace HTMLNames;
     42 
     43 const int maxErrors = 25;
     44 
     45 XMLErrors::XMLErrors(Document* document)
     46     : m_document(document)
     47     , m_errorCount(0)
     48     , m_lastErrorPosition(TextPosition::belowRangePosition())
     49 {
     50 }
     51 
     52 void XMLErrors::handleError(ErrorType type, const char* message, int lineNumber, int columnNumber)
     53 {
     54     handleError(type, message, TextPosition(OrdinalNumber::fromOneBasedInt(lineNumber), OrdinalNumber::fromOneBasedInt(columnNumber)));
     55 }
     56 
     57 void XMLErrors::handleError(ErrorType type, const char* message, TextPosition position)
     58 {
     59     if (type == fatal || (m_errorCount < maxErrors && m_lastErrorPosition.m_line != position.m_line && m_lastErrorPosition.m_column != position.m_column)) {
     60         switch (type) {
     61         case warning:
     62             appendErrorMessage("warning", position, message);
     63             break;
     64         case fatal:
     65         case nonFatal:
     66             appendErrorMessage("error", position, message);
     67         }
     68 
     69         m_lastErrorPosition = position;
     70         ++m_errorCount;
     71     }
     72 }
     73 
     74 void XMLErrors::appendErrorMessage(const String& typeString, TextPosition position, const char* message)
     75 {
     76     // <typeString> on line <lineNumber> at column <columnNumber>: <message>
     77     m_errorMessages.append(typeString);
     78     m_errorMessages.appendLiteral(" on line ");
     79     m_errorMessages.appendNumber(position.m_line.oneBasedInt());
     80     m_errorMessages.appendLiteral(" at column ");
     81     m_errorMessages.appendNumber(position.m_column.oneBasedInt());
     82     m_errorMessages.appendLiteral(": ");
     83     m_errorMessages.append(message);
     84 }
     85 
     86 static inline PassRefPtr<Element> createXHTMLParserErrorHeader(Document* doc, const String& errorMessages)
     87 {
     88     RefPtr<Element> reportElement = doc->createElement(QualifiedName(nullAtom, "parsererror", xhtmlNamespaceURI), true);
     89 
     90     Vector<Attribute> reportAttributes;
     91     reportAttributes.append(Attribute(styleAttr, "display: block; white-space: pre; border: 2px solid #c77; padding: 0 1em 0 1em; margin: 1em; background-color: #fdd; color: black"));
     92     reportElement->parserSetAttributes(reportAttributes);
     93 
     94     RefPtr<Element> h3 = doc->createElement(h3Tag, true);
     95     reportElement->parserAppendChild(h3.get());
     96     h3->parserAppendChild(doc->createTextNode("This page contains the following errors:"));
     97 
     98     RefPtr<Element> fixed = doc->createElement(divTag, true);
     99     Vector<Attribute> fixedAttributes;
    100     fixedAttributes.append(Attribute(styleAttr, "font-family:monospace;font-size:12px"));
    101     fixed->parserSetAttributes(fixedAttributes);
    102     reportElement->parserAppendChild(fixed.get());
    103 
    104     fixed->parserAppendChild(doc->createTextNode(errorMessages));
    105 
    106     h3 = doc->createElement(h3Tag, true);
    107     reportElement->parserAppendChild(h3.get());
    108     h3->parserAppendChild(doc->createTextNode("Below is a rendering of the page up to the first error."));
    109 
    110     return reportElement.release();
    111 }
    112 
    113 void XMLErrors::insertErrorMessageBlock()
    114 {
    115     // One or more errors occurred during parsing of the code. Display an error block to the user above
    116     // the normal content (the DOM tree is created manually and includes line/col info regarding
    117     // where the errors are located)
    118 
    119     // Create elements for display
    120     RefPtr<Element> documentElement = m_document->documentElement();
    121     if (!documentElement) {
    122         RefPtr<Element> rootElement = m_document->createElement(htmlTag, true);
    123         RefPtr<Element> body = m_document->createElement(bodyTag, true);
    124         rootElement->parserAppendChild(body);
    125         m_document->parserAppendChild(rootElement);
    126         rootElement->lazyAttach();
    127         documentElement = body.get();
    128     } else if (documentElement->namespaceURI() == SVGNames::svgNamespaceURI) {
    129         RefPtr<Element> rootElement = m_document->createElement(htmlTag, true);
    130         RefPtr<Element> body = m_document->createElement(bodyTag, true);
    131         rootElement->parserAppendChild(body);
    132 
    133         if (documentElement->attached())
    134             documentElement->detach();
    135         m_document->parserRemoveChild(documentElement.get());
    136 
    137         body->parserAppendChild(documentElement);
    138         m_document->parserAppendChild(rootElement);
    139         rootElement->lazyAttach();
    140 
    141         documentElement = body.get();
    142     }
    143 
    144     String errorMessages = m_errorMessages.toString();
    145     RefPtr<Element> reportElement = createXHTMLParserErrorHeader(m_document, errorMessages);
    146 
    147     if (m_document->transformSourceDocument()) {
    148         Vector<Attribute> attributes;
    149         attributes.append(Attribute(styleAttr, "white-space: normal"));
    150         RefPtr<Element> paragraph = m_document->createElement(pTag, true);
    151         paragraph->parserSetAttributes(attributes);
    152         paragraph->parserAppendChild(m_document->createTextNode("This document was created as the result of an XSL transformation. The line and column numbers given are from the transformed result."));
    153         reportElement->parserAppendChild(paragraph.release());
    154     }
    155 
    156     Node* firstChild = documentElement->firstChild();
    157     if (firstChild)
    158         documentElement->parserInsertBefore(reportElement, documentElement->firstChild());
    159     else
    160         documentElement->parserAppendChild(reportElement);
    161 
    162     reportElement->lazyAttach();
    163 
    164     // FIXME: Why do we need to call this manually?
    165     m_document->updateStyleIfNeeded();
    166 }
    167 
    168 } // namespace WebCore
    169