root/Source/core/dom/DOMTokenList.cpp

DEFINITIONS

1. validateToken
2. validateTokens
3. contains
4. add
5. add
6. remove
7. remove
8. toggle
9. toggle
10. addInternal
11. removeInternal
12. addToken
13. addTokens
14. removeToken
15. removeTokens

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/dom/DOMTokenList.h"

#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "wtf/text/StringBuilder.h"

namespace WebCore {

bool DOMTokenList::validateToken(const String& token, ExceptionState& exceptionState)
{
    if (token.isEmpty()) {
        exceptionState.throwDOMException(SyntaxError, "The token provided must not be empty.");
        return false;
    }

    unsigned length = token.length();
    for (unsigned i = 0; i < length; ++i) {
        if (isHTMLSpace<UChar>(token[i])) {
            exceptionState.throwDOMException(InvalidCharacterError, "The token provided ('" + token + "') contains HTML space characters, which are not valid in tokens.");
            return false;
        }
    }

    return true;
}

bool DOMTokenList::validateTokens(const Vector<String>& tokens, ExceptionState& exceptionState)
{
    for (size_t i = 0; i < tokens.size(); ++i) {
        if (!validateToken(tokens[i], exceptionState))
            return false;
    }

    return true;
}

bool DOMTokenList::contains(const AtomicString& token, ExceptionState& exceptionState) const
{
    if (!validateToken(token, exceptionState))
        return false;
    return containsInternal(token);
}

void DOMTokenList::add(const AtomicString& token, ExceptionState& exceptionState)
{
    Vector<String> tokens;
    tokens.append(token.string());
    add(tokens, exceptionState);
}

// Optimally, this should take a Vector<AtomicString> const ref in argument but the
// bindings generator does not handle that.
void DOMTokenList::add(const Vector<String>& tokens, ExceptionState& exceptionState)
{
    Vector<String> filteredTokens;
    filteredTokens.reserveCapacity(tokens.size());
    for (size_t i = 0; i < tokens.size(); ++i) {
        if (!validateToken(tokens[i], exceptionState))
            return;
        if (containsInternal(AtomicString(tokens[i])))
            continue;
        if (filteredTokens.contains(tokens[i]))
            continue;
        filteredTokens.append(tokens[i]);
    }

    if (filteredTokens.isEmpty())
        return;

    setValue(addTokens(value(), filteredTokens));
}

void DOMTokenList::remove(const AtomicString& token, ExceptionState& exceptionState)
{
    Vector<String> tokens;
    tokens.append(token.string());
    remove(tokens, exceptionState);
}

// Optimally, this should take a Vector<AtomicString> const ref in argument but the
// bindings generator does not handle that.
void DOMTokenList::remove(const Vector<String>& tokens, ExceptionState& exceptionState)
{
    if (!validateTokens(tokens, exceptionState))
        return;

    // Check using containsInternal first since it is a lot faster than going
    // through the string character by character.
    bool found = false;
    for (size_t i = 0; i < tokens.size(); ++i) {
        if (containsInternal(AtomicString(tokens[i]))) {
            found = true;
            break;
        }
    }

    if (found)
        setValue(removeTokens(value(), tokens));
}

bool DOMTokenList::toggle(const AtomicString& token, ExceptionState& exceptionState)
{
    if (!validateToken(token, exceptionState))
        return false;

    if (containsInternal(token)) {
        removeInternal(token);
        return false;
    }
    addInternal(token);
    return true;
}

bool DOMTokenList::toggle(const AtomicString& token, bool force, ExceptionState& exceptionState)
{
    if (!validateToken(token, exceptionState))
        return false;

    if (force)
        addInternal(token);
    else
        removeInternal(token);

    return force;
}

void DOMTokenList::addInternal(const AtomicString& token)
{
    if (!containsInternal(token))
        setValue(addToken(value(), token));
}

void DOMTokenList::removeInternal(const AtomicString& token)
{
    // Check using contains first since it uses AtomicString comparisons instead
    // of character by character testing.
    if (!containsInternal(token))
        return;
    setValue(removeToken(value(), token));
}

AtomicString DOMTokenList::addToken(const AtomicString& input, const AtomicString& token)
{
    Vector<String> tokens;
    tokens.append(token.string());
    return addTokens(input, tokens);
}

// This returns an AtomicString because it is always passed as argument to setValue() and setValue()
// takes an AtomicString in argument.
AtomicString DOMTokenList::addTokens(const AtomicString& input, const Vector<String>& tokens)
{
    bool needsSpace = false;

    StringBuilder builder;
    if (!input.isEmpty()) {
        builder.append(input);
        needsSpace = !isHTMLSpace<UChar>(input[input.length() - 1]);
    }

    for (size_t i = 0; i < tokens.size(); ++i) {
        if (needsSpace)
            builder.append(' ');
        builder.append(tokens[i]);
        needsSpace = true;
    }

    return builder.toAtomicString();
}

AtomicString DOMTokenList::removeToken(const AtomicString& input, const AtomicString& token)
{
    Vector<String> tokens;
    tokens.append(token.string());
    return removeTokens(input, tokens);
}

// This returns an AtomicString because it is always passed as argument to setValue() and setValue()
// takes an AtomicString in argument.
AtomicString DOMTokenList::removeTokens(const AtomicString& input, const Vector<String>& tokens)
{
    // Algorithm defined at http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#remove-a-token-from-a-string
    // New spec is at http://dom.spec.whatwg.org/#remove-a-token-from-a-string

    unsigned inputLength = input.length();
    StringBuilder output; // 3
    output.reserveCapacity(inputLength);
    unsigned position = 0; // 4

    // Step 5
    while (position < inputLength) {
        if (isHTMLSpace<UChar>(input[position])) { // 6
            output.append(input[position++]); // 6.1, 6.2
            continue; // 6.3
        }

        // Step 7
        StringBuilder tokenBuilder;
        while (position < inputLength && isNotHTMLSpace<UChar>(input[position]))
            tokenBuilder.append(input[position++]);

        // Step 8
        String token = tokenBuilder.toString();
        if (tokens.contains(token)) {
            // Step 8.1
            while (position < inputLength && isHTMLSpace<UChar>(input[position]))
                ++position;

            // Step 8.2
            size_t j = output.length();
            while (j > 0 && isHTMLSpace<UChar>(output[j - 1]))
                --j;
            output.resize(j);

            // Step 8.3
            if (position < inputLength && !output.isEmpty())
                output.append(' ');
        } else {
            output.append(token); // Step 9
        }
    }

    return output.toAtomicString();
}

} // namespace WebCore