2017-04-26 00:52:35 +00:00
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<script src="../resources/js-test-pre.js"></script>
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</head>
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<body>
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<pre id='console'></pre>
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<canvas></canvas>
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<script>
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"use strict";
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const log = console.log.bind(console);
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const canvas = document.querySelector("canvas");
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const ctx = canvas.getContext("2d");
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let callCount = 0;
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function makeValue(x) {
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return {
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valueOf() { ++callCount; return x; }
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};
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}
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let array = [makeValue(1), makeValue(2), makeValue(3)];
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ctx.setLineDash(array);
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let a = ctx.getLineDash();
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log("Using an array but with objects with valueOf()");
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log(a);
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ctx.setLineDash([1,2,3]);
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let b = ctx.getLineDash();
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log(b);
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if (a.toString() !== b.toString())
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throw new Error("Bad result. They should be equal.");
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log(`callCount: ${callCount}`);
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if (callCount !== 3)
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throw new Error("Bad result. callCount should be 3.");
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let iter = [][Symbol.iterator]();
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let iterProto = Object.getPrototypeOf(iter);
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let oldNext = iterProto.next;
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callCount = 0;
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function hackedNext() {
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++callCount;
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let val = oldNext.call(this);
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if ("value" in val) {
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val.value++;
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}
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return val;
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}
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const obj = {
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valueOf: function() {
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iterProto.next = hackedNext;
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return 2;
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}
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};
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array = [1, obj, 3];
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ctx.setLineDash(array);
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b = ctx.getLineDash();
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log(`${b}`);
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iterProto.next = oldNext;
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2017-09-23 02:08:04 +00:00
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ctx.setLineDash([1,2,3]);
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2017-04-26 00:52:35 +00:00
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a = ctx.getLineDash();
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log(a);
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if (a.toString() !== b.toString())
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throw new Error("Bad result. They should be equal.");
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log(`callCount: ${callCount}`);
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2017-09-23 02:08:04 +00:00
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if (callCount !== 0)
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throw new Error("Bad result. callCount should be 0.");
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2017-04-26 00:52:35 +00:00
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</script>
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<script src="../resources/js-test-post.js"></script>
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</body>
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</html>
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