Source/WebCore/bindings/js/JSHTMLAllCollectionCustom.cpp

/*
 * Copyright (C) 2009, 2016 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "config.h"
#include "JSHTMLAllCollection.h"

#include "HTMLAllCollection.h"
#include "JSNode.h"
#include "JSNodeList.h"
#include "StaticNodeList.h"
#include <runtime/IdentifierInlines.h>

using namespace JSC;

namespace WebCore {

static JSValue namedItems(ExecState& state, JSHTMLAllCollection* collection, PropertyName propertyName)
{
    Vector<Ref<Element>> namedItems = collection->wrapped().namedItems(propertyNameToAtomicString(propertyName));

    if (namedItems.isEmpty())
        return jsUndefined();
    if (namedItems.size() == 1)
        return toJS(&state, collection->globalObject(), namedItems[0]);

    // FIXME: HTML5 specification says this should be a HTMLCollection.
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlallcollection
    return toJS(&state, collection->globalObject(), StaticElementList::create(WTFMove(namedItems)));
}

// HTMLAllCollections are strange objects, they support both get and call.
static EncodedJSValue JSC_HOST_CALL callHTMLAllCollection(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (exec->argumentCount() < 1)
        return JSValue::encode(jsUndefined());

    // Do not use thisObj here. It can be the JSHTMLDocument, in the document.forms(i) case.
    JSHTMLAllCollection* jsCollection = jsCast<JSHTMLAllCollection*>(exec->callee());
    HTMLAllCollection& collection = jsCollection->wrapped();

    // Also, do we need the TypeError test here ?

    if (exec->argumentCount() == 1) {
        // Support for document.all(<index>) etc.
        String string = exec->argument(0).toString(exec)->value(exec);
        RETURN_IF_EXCEPTION(scope, encodedJSValue());
        if (Optional<uint32_t> index = parseIndex(*string.impl()))
            return JSValue::encode(toJS(exec, jsCollection->globalObject(), collection.item(index.value())));

        // Support for document.images('<name>') etc.
        return JSValue::encode(namedItems(*exec, jsCollection, Identifier::fromString(exec, string)));
    }

    // The second arg, if set, is the index of the item we want
    String string = exec->argument(0).toString(exec)->value(exec);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());
    if (Optional<uint32_t> index = parseIndex(*exec->argument(1).toWTFString(exec).impl())) {
        if (auto* item = collection.namedItemWithIndex(string, index.value()))
            return JSValue::encode(toJS(exec, jsCollection->globalObject(), *item));
    }

    return JSValue::encode(jsUndefined());
}

CallType JSHTMLAllCollection::getCallData(JSCell*, CallData& callData)
{
    callData.native.function = callHTMLAllCollection;
    return CallType::Host;
}

bool JSHTMLAllCollection::nameGetter(ExecState* state, PropertyName propertyName, JSValue& value)
{
    JSValue items = namedItems(*state, this, propertyName);
    if (items.isUndefined())
        return false;

    value = items;
    return true;
}

JSValue JSHTMLAllCollection::item(ExecState& state)
{
    VM& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (UNLIKELY(state.argumentCount() < 1))
        return throwException(&state, scope, createNotEnoughArgumentsError(&state));

    String argument = state.uncheckedArgument(0).toWTFString(&state);
    if (Optional<uint32_t> index = parseIndex(*argument.impl()))
        return toJS(&state, globalObject(), wrapped().item(index.value()));
    return namedItems(state, this, Identifier::fromString(&state, argument));
}

JSValue JSHTMLAllCollection::namedItem(ExecState& state)
{
    JSValue value = namedItems(state, this, Identifier::fromString(&state, state.argument(0).toString(&state)->value(&state)));
    return value.isUndefined() ? jsNull() : value;
}

} // namespace WebCore