<html>
<head>
<style>
.pass {
    color: green;
    font-weight: bold;
}

.fail {
    color: red;
    font-weight: bold;
}
</style>
</head>
<body>
<span>Tests that canvas 2d context supports 'direction' attribute: <span id="supported"></span></span>
<div>
<span>Tests that context.direction is 'ltr' with parent element having unspecified direction: <span id="result1"></span></span><br>
<canvas id="canvas1" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div dir="rtl">
<span>Tests that context.direction is 'rtl' with parent element having direction as rtl: <span id="result2"></span></span><br>
<canvas id="canvas2" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div>
<span>Tests that context.direction is overridden by 'rtl' with parent element having unspecified direction: <span id="result3"></span></span><br>
<canvas id="canvas3" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div dir="rtl">
<span>Tests that context.direction is overridden by 'ltr' with parent element having direction as rtl: <span id="result4"></span></span><br>
<canvas id="canvas4" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div>
<span>Tests that context.direction is overridden by 'inherit' with parent element having unspecified direction: <span id="result5"></span></span><br>
<canvas id="canvas5" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div dir="rtl">
<span>Tests that context.direction is overridden by 'inherit' with parent element having direction as rtl: <span id="result6"></span></span><br>
<canvas id="canvas6" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div>
<span>Tests that context.reset sets the direction as ltr<span id="result7"></span></span><br>
<canvas id="canvas7" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div dir="rtl">
<span>Tests that context.reset sets the direction as rtl<span id="result8"></span></span><br>
<canvas id="canvas8" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div>
<span>Tests that change in element's dir attribute is reflected in context.direction as rtl: <span id="result9"></span></span><br>
<canvas id="canvas9" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div dir="rtl">
<span>Tests that change in element's dir attribute is reflected in context.direction as ltr: <span id="result10"></span></span><br>
<canvas id="canvas10" width=400 height=20 style="border:1px solid black"></canvas>
</div>
<div>
<span>Tests that context.direction reflects the valid direction after save/restore context operations: <span id="result11"></span></span><br>
<canvas id="canvas11" style="border:1px solid black"></canvas>
</div>
<div id="results">
</div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

var newCanvasElement = document.createElement('canvas');
document.getElementById('supported').textContent = newCanvasElement.getContext('2d').direction ? 'PASS' : 'FAIL';
document.getElementById('supported').className = newCanvasElement.getContext('2d').direction ? 'pass' : 'fail';

var fontSettings = "12px 'Arial'";

function appendResult(description, result)
{
    var descriptionElement = document.createElement('span');
    var resultElement = document.createElement('span');
    descriptionElement.innerHTML = description;
    resultElement.textContent = result;
    resultElement.className = (result === 'PASS') ? 'pass' : 'fail';
    descriptionElement.appendChild(resultElement);
    document.getElementById("results").appendChild(descriptionElement);
    document.getElementById("results").appendChild(document.createElement('br'));
}

function verifyDrawText(canvasId, resultId, text, expectedDirection)
{
    var canvasElement = document.getElementById(canvasId);
    var resultElement = document.getElementById(resultId);
    var ctx = canvasElement.getContext('2d');
    var width = canvasElement.width/2;
    var height = canvasElement.height;
    resultElement.textContent = (ctx.direction == expectedDirection) ? 'PASS' : 'FAIL';
    resultElement.className = (ctx.direction == expectedDirection) ? 'pass' : 'fail';
    ctx.moveTo(width, 0);
    ctx.lineTo(width, height);
    ctx.stroke();
    ctx.font = fontSettings;
    ctx.fillText(text, width, height/2);
}

function verifyDrawTextWithSpecifiedDirection(canvasId, resultId, text, direction, expectedDirection)
{
    var canvasElement = document.getElementById(canvasId);
    var resultElement = document.getElementById(resultId);
    var ctx = canvasElement.getContext('2d');
    var width = canvasElement.width/2;
    var height = canvasElement.height;
    var currentDirection = ctx.direction;
    ctx.direction = direction;
    resultElement.textContent = (currentDirection && (ctx.direction == expectedDirection)) ? 'PASS' : 'FAIL';
    resultElement.className = (currentDirection && (ctx.direction == expectedDirection)) ? 'pass' : 'fail';
    ctx.moveTo(width, 0);
    ctx.lineTo(width, height);
    ctx.stroke();
    ctx.font = fontSettings;
    ctx.fillText(text, width, height/2);
}

function verifyDirectionAfterReset(canvasId, text, direction, expectedDirection)
{
    var canvasElement = document.getElementById(canvasId);
    var width = canvasElement.width/2;
    var height = canvasElement.height;
    var ctx = canvasElement.getContext('2d');
    ctx.direction = direction;
    ctx.moveTo(width, 0);
    ctx.lineTo(width, height);
    ctx.stroke();
    ctx.font = fontSettings;
    ctx.fillText(text, width, height/2);
    canvasElement.width = canvasElement.width + 1;
    var description = 'Tests that context.reset() sets the context.direction to ' + expectedDirection + ': ';
    var result = (ctx.direction == expectedDirection) ? 'PASS' : 'FAIL';
    appendResult(description, result);
    document.body.removeChild(canvasElement.parentElement);
}

function verifyDirectionAfterAttributeChange(canvasId, resultId, text, newDirection, forParentElement)
{
    var canvasElement = document.getElementById(canvasId);
    var resultElement = document.getElementById(resultId);
    var ctx = canvasElement.getContext('2d');
    var width = canvasElement.width/2;
    var height = canvasElement.height;

    if (forParentElement)
        canvasElement.parentElement.dir = newDirection;
    else
        canvasElement.dir = newDirection;
    resultElement.textContent = ctx.direction == newDirection ? 'PASS' : 'FAIL';
    resultElement.className = ctx.direction == newDirection ? 'pass' : 'fail';
    ctx.moveTo(width, 0);
    ctx.lineTo(width, height);
    ctx.stroke();
    ctx.font = fontSettings;
    ctx.fillText(text, width, height/2);
}

function verifyDirectionAcrossSaveRestores(canvasId, resultId, testVector)
{
    var canvasElement = document.getElementById(canvasId);
    var resultElement = document.getElementById(resultId);
    var ctx = canvasElement.getContext('2d');
    var width = canvasElement.width/2;
    var height = 0;
    ctx.moveTo(width, 0);
    ctx.lineTo(width, canvasElement.height);
    ctx.stroke();
    ctx.font = fontSettings;
    var testVectorLength = testVector.length;
    var i = 0;
    for (; i < testVector.length; ++i) {
        height += 20;
        ctx.direction = testVector[i].direction;
        ctx.fillText(testVector[i].text, width, height);
        if (i != testVectorLength - 1)
            ctx.save();
    }
    var validDirectionCount = 0;
    for (--i; i > 0; --i) {
        ctx.restore();
        if (ctx.direction == testVector[i - 1].direction)
            validDirectionCount++;
    }
    resultElement.textContent = validDirectionCount == testVectorLength - 1 ? 'PASS' : 'FAIL';
    resultElement.className = validDirectionCount == testVectorLength - 1 ? 'pass' : 'fail';
}

function verifyInvalidDirection(direction)
{
    var ctx = document.createElement('canvas').getContext('2d');
    var currentDirection = ctx.direction;
    ctx.direction = direction;
    var description = 'Tests that invalid direction value ' + direction + ' has no effect on the context.direction: ';
    var result = (ctx.direction == currentDirection) ? 'PASS' : 'FAIL';
    appendResult(description, result);
}

verifyDrawText('canvas1', 'result1', 'Left-to-Right text', 'ltr');
verifyDrawText('canvas2', 'result2', 'Right-to-Left text', 'rtl');

verifyDrawTextWithSpecifiedDirection('canvas3', 'result3', 'Right-to-Left text', 'rtl', 'rtl');
verifyDrawTextWithSpecifiedDirection('canvas4', 'result4', 'Left-to-Right text', 'ltr', 'ltr');
verifyDrawTextWithSpecifiedDirection('canvas5', 'result5', 'Left-to-Right text', 'inherit', 'ltr');
verifyDrawTextWithSpecifiedDirection('canvas6', 'result6', 'Right-to-Left text', 'inherit', 'rtl');

verifyDirectionAfterReset('canvas7', 'Right-to-Left', 'rtl', 'ltr');
verifyDirectionAfterReset('canvas8', 'Right-to-Left', 'ltr', 'rtl');

verifyDirectionAfterAttributeChange('canvas9', 'result9', 'Right-to-Left text', 'rtl', true);
verifyDirectionAfterAttributeChange('canvas10', 'result10', 'Left-to-Right text', 'ltr', false);

verifyDirectionAcrossSaveRestores('canvas11',
                                  'result11',
                                  [{ text: 'Left-to-Right text', direction: 'ltr' },
                                   { text: 'Right-to-Left text', direction: 'rtl' },
                                   { text: 'Right-to-Left text', direction: 'rtl' },
                                   { text: 'Left-to-Right text', direction: 'ltr' },
                                   { text: 'Right-to-Left text', direction: 'rtl' },
                                   { text: 'Right-to-Left text', direction: 'rtl' }]);

verifyInvalidDirection('RTL');
verifyInvalidDirection('LTR');
verifyInvalidDirection('INHERIT');
</script>