Source/core/editing/TextIteratorTest.cpp

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#include "config.h"
#include "core/editing/TextIterator.h"

#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/Node.h"
#include "core/dom/Range.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/frame/FrameView.h"
#include "core/html/HTMLDocument.h"
#include "core/html/HTMLElement.h"
#include "core/testing/DummyPageHolder.h"
#include "platform/geometry/IntSize.h"
#include "wtf/Compiler.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/StdLibExtras.h"
#include "wtf/Vector.h"
#include "wtf/testing/WTFTestHelpers.h"
#include <gtest/gtest.h>

using namespace WebCore;

namespace {

class TextIteratorTest : public ::testing::Test {
protected:
    virtual void SetUp() OVERRIDE;

    HTMLDocument& document() const;

    Vector<String> iterate(TextIteratorBehavior = TextIteratorDefaultBehavior);
    Vector<String> iteratePartial(const Position& start, const Position& end, TextIteratorBehavior = TextIteratorDefaultBehavior);

    void setBodyInnerHTML(const char*);
    PassRefPtrWillBeRawPtr<Range> getBodyRange() const;

private:
    Vector<String> iterateWithIterator(TextIterator&);

    OwnPtr<DummyPageHolder> m_dummyPageHolder;

    HTMLDocument* m_document;
};

void TextIteratorTest::SetUp()
{
    m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
    m_document = toHTMLDocument(&m_dummyPageHolder->document());
    ASSERT(m_document);
}

Vector<String> TextIteratorTest::iterate(TextIteratorBehavior iteratorBehavior)
{
    document().view()->updateLayoutAndStyleIfNeededRecursive(); // Force renderers to be created; TextIterator needs them.
    RefPtrWillBeRawPtr<Range> range = getBodyRange();
    TextIterator iterator(range.get(), iteratorBehavior);
    return iterateWithIterator(iterator);
}

Vector<String> TextIteratorTest::iteratePartial(const Position& start, const Position& end, TextIteratorBehavior iteratorBehavior)
{
    document().view()->updateLayoutAndStyleIfNeededRecursive();
    TextIterator iterator(start, end, iteratorBehavior);
    return iterateWithIterator(iterator);
}

Vector<String> TextIteratorTest::iterateWithIterator(TextIterator& iterator)
{
    Vector<String> textChunks;
    while (!iterator.atEnd()) {
        textChunks.append(iterator.substring(0, iterator.length()));
        iterator.advance();
    }
    return textChunks;
}

HTMLDocument& TextIteratorTest::document() const
{
    return *m_document;
}

void TextIteratorTest::setBodyInnerHTML(const char* bodyContent)
{
    document().body()->setInnerHTML(String::fromUTF8(bodyContent), ASSERT_NO_EXCEPTION);
}

PassRefPtrWillBeRawPtr<Range> TextIteratorTest::getBodyRange() const
{
    RefPtrWillBeRawPtr<Range> range(Range::create(document()));
    range->selectNode(document().body());
    return range.release();
}

Vector<String> createVectorString(const char* const* rawStrings, size_t size)
{
    Vector<String> result;
    result.append(rawStrings, size);
    return result;
}

PassRefPtrWillBeRawPtr<ShadowRoot> createShadowRootForElementWithIDAndSetInnerHTML(TreeScope& scope, const char* hostElementID, const char* shadowRootContent)
{
    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = scope.getElementById(AtomicString::fromUTF8(hostElementID))->createShadowRoot(ASSERT_NO_EXCEPTION);
    shadowRoot->setInnerHTML(String::fromUTF8(shadowRootContent), ASSERT_NO_EXCEPTION);
    return shadowRoot.release();
}

TEST_F(TextIteratorTest, BasicIteration)
{
    static const char* input = "<p>Hello, \ntext</p><p>iterator.</p>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "text",
        "\n",
        "\n",
        "iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(input);
    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, NotEnteringTextControls)
{
    static const char* input = "<p>Hello <input type=\"text\" value=\"input\">!</p>";
    static const char* expectedTextChunksRawString[] = {
        "Hello ",
        "",
        "!",
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(input);
    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, EnteringTextControlsWithOption)
{
    static const char* input = "<p>Hello <input type=\"text\" value=\"input\">!</p>";
    static const char* expectedTextChunksRawString[] = {
        "Hello ",
        "\n",
        "input",
        "!",
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(input);
    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersTextControls));
}

TEST_F(TextIteratorTest, EnteringTextControlsWithOptionComplex)
{
    static const char* input = "<input type=\"text\" value=\"Beginning of range\"><div><div><input type=\"text\" value=\"Under DOM nodes\"></div></div><input type=\"text\" value=\"End of range\">";
    static const char* expectedTextChunksRawString[] = {
        "\n", // FIXME: Why newline here?
        "Beginning of range",
        "\n",
        "Under DOM nodes",
        "\n",
        "End of range"
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(input);
    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersTextControls));
}

TEST_F(TextIteratorTest, NotEnteringTextControlHostingShadowTreeEvenWithOption)
{
    static const char* bodyContent = "<div>Hello, <input type=\"text\" value=\"input\" id=\"input\"> iterator.</div>";
    static const char* shadowContent = "<span>shadow</span>";
    // TextIterator doesn't emit "input" nor "shadow" since (1) the renderer for <input> is not created; and
    // (2) we don't (yet) recurse into shadow trees.
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "", // FIXME: Why is an empty string emitted here?
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "input", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, NotEnteringShadowTree)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span>shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ", // TextIterator doesn't emit "text" since its renderer is not created. The shadow tree is ignored.
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, NotEnteringShadowTreeWithMultipleShadowTrees)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent1 = "<span>first shadow</span>";
    static const char* shadowContent2 = "<span>second shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent1);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent2);

    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, NotEnteringShadowTreeWithNestedShadowTrees)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host-in-document\">text</span> iterator.</div>";
    static const char* shadowContent1 = "<span>first <span id=\"host-in-shadow\">shadow</span></span>";
    static const char* shadowContent2 = "<span>second shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot1 = createShadowRootForElementWithIDAndSetInnerHTML(document(), "host-in-document", shadowContent1);
    createShadowRootForElementWithIDAndSetInnerHTML(*shadowRoot1, "host-in-shadow", shadowContent2);

    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, NotEnteringShadowTreeWithContentInsertionPoint)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span>shadow <content>content</content></span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "text", // In this case a renderer for "text" is created, so it shows up here.
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, EnteringShadowTreeWithOption)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span>shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "shadow", // TextIterator emits "shadow" since TextIteratorEntersAuthorShadowRoots is specified.
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, EnteringShadowTreeWithMultipleShadowTreesWithOption)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent1 = "<span>first shadow</span>";
    static const char* shadowContent2 = "<span>second shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "second shadow", // The first isn't emitted because a renderer for the first is not created.
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent1);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent2);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, EnteringShadowTreeWithNestedShadowTreesWithOption)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host-in-document\">text</span> iterator.</div>";
    static const char* shadowContent1 = "<span>first <span id=\"host-in-shadow\">shadow</span></span>";
    static const char* shadowContent2 = "<span>second shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        "first ",
        "second shadow",
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot1 = createShadowRootForElementWithIDAndSetInnerHTML(document(), "host-in-document", shadowContent1);
    createShadowRootForElementWithIDAndSetInnerHTML(*shadowRoot1, "host-in-shadow", shadowContent2);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, EnteringShadowTreeWithContentInsertionPointWithOption)
{
    static const char* bodyContent = "<div>Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span><content>content</content> shadow</span>";
    // In this case a renderer for "text" is created, and emitted AFTER any nodes in the shadow tree.
    // This order does not match the order of the rendered texts, but at this moment it's the expected behavior.
    // FIXME: Fix this. We probably need pure-renderer-based implementation of TextIterator to achieve this.
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        " shadow",
        "text",
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, StartingAtNodeInShadowRoot)
{
    static const char* bodyContent = "<div id=\"outer\">Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span><content>content</content> shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        " shadow",
        "text",
        " iterator."
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);
    Node* outerDiv = document().getElementById("outer");
    Node* spanInShadow = shadowRoot->firstChild();
    Position start(spanInShadow, Position::PositionIsBeforeChildren);
    Position end(outerDiv, Position::PositionIsAfterChildren);

    EXPECT_EQ(expectedTextChunks, iteratePartial(start, end, TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, FinishingAtNodeInShadowRoot)
{
    static const char* bodyContent = "<div id=\"outer\">Hello, <span id=\"host\">text</span> iterator.</div>";
    static const char* shadowContent = "<span><content>content</content> shadow</span>";
    static const char* expectedTextChunksRawString[] = {
        "Hello, ",
        " shadow"
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);
    Node* outerDiv = document().getElementById("outer");
    Node* spanInShadow = shadowRoot->firstChild();
    Position start(outerDiv, Position::PositionIsBeforeChildren);
    Position end(spanInShadow, Position::PositionIsAfterChildren);

    EXPECT_EQ(expectedTextChunks, iteratePartial(start, end, TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, FullyClipsContents)
{
    static const char* bodyContent =
        "<div style=\"overflow: hidden; width: 200px; height: 0;\">"
        "I'm invisible"
        "</div>";
    Vector<String> expectedTextChunks; // Empty.

    setBodyInnerHTML(bodyContent);
    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, IgnoresContainerClip)
{
    static const char* bodyContent =
        "<div style=\"overflow: hidden; width: 200px; height: 0;\">"
        "<div>I'm not visible</div>"
        "<div style=\"position: absolute; width: 200px; height: 200px; top: 0; right: 0;\">"
        "but I am!"
        "</div>"
        "</div>";
    static const char* expectedTextChunksRawString[] = {
        "but I am!"
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    EXPECT_EQ(expectedTextChunks, iterate());
}

TEST_F(TextIteratorTest, FullyClippedContentsDistributed)
{
    static const char* bodyContent =
        "<div id=\"host\">"
        "<div>Am I visible?</div>"
        "</div>";
    static const char* shadowContent =
        "<div style=\"overflow: hidden; width: 200px; height: 0;\">"
        "<content></content>"
        "</div>";
    static const char* expectedTextChunksRawString[] = {
        "\n",
        // FIXME: The text below is actually invisible but TextIterator currently thinks it's visible.
        "Am I visible?"
    };
    Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, IgnoresContainersClipDistributed)
{
    static const char* bodyContent =
        "<div id=\"host\" style=\"overflow: hidden; width: 200px; height: 0;\">"
        "<div>Nobody can find me!</div>"
        "</div>";
    static const char* shadowContent =
        "<div style=\"position: absolute; width: 200px; height: 200px; top: 0; right: 0;\">"
        "<content></content>"
        "</div>";
    // FIXME: The text below is actually visible but TextIterator currently thinks it's invisible.
    // static const char* expectedTextChunksRawString[] = {
    //     "\n",
    //     "Nobody can find me!"
    // };
    // Vector<String> expectedTextChunks = createVectorString(expectedTextChunksRawString, WTF_ARRAY_LENGTH(expectedTextChunksRawString));
    Vector<String> expectedTextChunks; // Empty.

    setBodyInnerHTML(bodyContent);
    createShadowRootForElementWithIDAndSetInnerHTML(document(), "host", shadowContent);

    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEntersAuthorShadowRoots));
}

TEST_F(TextIteratorTest, FindPlainTextInvalidTarget)
{
    static const char* bodyContent = "<div>foo bar test</div>";
    setBodyInnerHTML(bodyContent);
    RefPtrWillBeRawPtr<Range> range = getBodyRange();

    RefPtrWillBeRawPtr<Range> expectedRange = range->cloneRange();
    expectedRange->collapse(false);

    // A lone lead surrogate (0xDA0A) example taken from fuzz-58.
    static const UChar invalid1[] = {
        0x1461u, 0x2130u, 0x129bu, 0xd711u, 0xd6feu, 0xccadu, 0x7064u,
        0xd6a0u, 0x4e3bu, 0x03abu, 0x17dcu, 0xb8b7u, 0xbf55u, 0xfca0u,
        0x07fau, 0x0427u, 0xda0au, 0
    };

    // A lone trailing surrogate (U+DC01).
    static const UChar invalid2[] = {
        0x1461u, 0x2130u, 0x129bu, 0xdc01u, 0xd6feu, 0xccadu, 0
    };
    // A trailing surrogate followed by a lead surrogate (U+DC03 U+D901).
    static const UChar invalid3[] = {
        0xd800u, 0xdc00u, 0x0061u, 0xdc03u, 0xd901u, 0xccadu, 0
    };

    static const UChar* invalidUStrings[] = { invalid1, invalid2, invalid3 };

    for (size_t i = 0; i < WTF_ARRAY_LENGTH(invalidUStrings); ++i) {
        String invalidTarget(invalidUStrings[i]);
        RefPtrWillBeRawPtr<Range> actualRange = findPlainText(range.get(), invalidTarget, 0);
        EXPECT_TRUE(areRangesEqual(expectedRange.get(), actualRange.get()));
    }
}

TEST_F(TextIteratorTest, EmitsReplacementCharForInput)
{
    static const char* bodyContent =
        "<div contenteditable=\"true\">"
        "Before"
        "<img src=\"foo.png\">"
        "After"
        "</div>";
    // "Before".
    static const UChar expectedRawString1[] = { 0x42, 0x65, 0x66, 0x6F, 0x72, 0x65, 0 };
    // Object replacement char.
    static const UChar expectedRawString2[] = { 0xFFFC, 0 };
    // "After".
    static const UChar expectedRawString3[] = { 0x41, 0x66, 0x74, 0x65, 0x72, 0 };
    static const UChar* expectedRawStrings[] = { expectedRawString1, expectedRawString2, expectedRawString3 };
    Vector<String> expectedTextChunks;
    expectedTextChunks.append(expectedRawStrings, WTF_ARRAY_LENGTH(expectedRawStrings));

    setBodyInnerHTML(bodyContent);
    EXPECT_EQ(expectedTextChunks, iterate(TextIteratorEmitsObjectReplacementCharacter));
}

TEST_F(TextIteratorTest, RangeLengthWithReplacedElements)
{
    static const char* bodyContent =
        "<div id=\"div\" contenteditable=\"true\">1<img src=\"foo.png\">3</div>";
    setBodyInnerHTML(bodyContent);
    document().view()->updateLayoutAndStyleIfNeededRecursive();

    Node* divNode = document().getElementById("div");
    RefPtrWillBeRawPtr<Range> range = Range::create(document(), divNode, 0, divNode, 3);

    EXPECT_EQ(3, TextIterator::rangeLength(range.get()));
}

}