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110 lines
4.3 KiB
HTML
110 lines
4.3 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test for correct handling of aStartStruct parameter to nsRuleNode::Compute*Data</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="property_database.js"></script>
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<style type="text/css" id="stylesheet"></style>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=216456">Mozilla Bug 216456</a>
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<p id="display">
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<span id="base"></span>
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<span id="test"></span>
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</p>
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<div id="content" style="display: none">
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</div>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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/**
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* The purpose of this test is to test that nsRuleNode::Compute*Data
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* functions are written correctly. In particular, in these functions,
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* when the specified value of a property has unit eCSSUnit_Null,
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* touching the computed data is forbidden. This is because we
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* sometimes stop walking up the rule tree when we find computed data
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* for an initial subsequence of our rules (i.e., an ancestor rule node)
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* that we can use as a starting point (aStartStruct) for the
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* computation for the current rule node.
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*
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* If one of these tests fails, you should look for a case where the
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* property's code in nsRuleNode::Compute*Data touches the computed
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* value when the specified value has eCSSUnit_Null, and fix it.
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*
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* The test works by maintaining one style rule that has every CSS
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* property specified, and a second style rule that has different values
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* for every property, an element that matches only the first rule (so
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* that we'll have a cached struct), and *later* an element that matches
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* both rules (for whose computation we'll find the struct cached from
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* the first element). (It does this twice, once with the overriding in
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* each direction, because one of the cases might match the incorrect
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* overwriting.) Then, in the second style rule, it unsets each
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* property, one at a time, and checks that the computation works
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* correctly. (The reason to want every property set is to hit a case
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* where we can store the data in the rule tree... though this isn't
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* guaranteed.)
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*/
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function xfail_computecheck(prop, roundnum) {
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return false;
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}
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function xfail_test(prop, roundnum) {
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return false;
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}
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var gStyleSheet = document.getElementById("stylesheet").sheet;
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var gRule1 = gStyleSheet.cssRules[gStyleSheet.insertRule("#base, #test {}", gStyleSheet.cssRules.length)];
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var gRule2 = gStyleSheet.cssRules[gStyleSheet.insertRule("#test {}", gStyleSheet.cssRules.length)];
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var gBase = getComputedStyle(document.getElementById("base"), "");
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var gTest = getComputedStyle(document.getElementById("test"), "");
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function round(lower_set, higher_set, roundnum) {
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for (var prop in gCSSProperties) {
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var info = gCSSProperties[prop];
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if (info.backend_only || info.subproperties || info.get_computed)
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continue;
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gRule1.style.setProperty(prop, info[lower_set][0], "");
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gRule2.style.setProperty(prop, info[higher_set][0], "");
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}
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for (var prop in gCSSProperties) {
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var info = gCSSProperties[prop];
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if (info.backend_only || info.subproperties || info.get_computed)
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continue;
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if ("prerequisites" in info) {
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for (var prereq in info.prerequisites) {
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gRule2.style.setProperty(prereq, info.prerequisites[prereq], "");
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}
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}
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gBase.getPropertyValue(prop);
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var higher_set_val = gTest.getPropertyValue(prop);
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gRule2.style.setProperty(prop, info[lower_set][0], "");
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var lower_set_val = gTest.getPropertyValue(prop);
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(xfail_computecheck(prop, roundnum) ? todo_isnot : isnot)(higher_set_val, lower_set_val, "initial and other values of " + prop + " are different");
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gRule2.style.removeProperty(prop);
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(xfail_test(prop, roundnum) ? todo_is : is)(gTest.getPropertyValue(prop), lower_set_val, prop + " is not touched when its value comes from aStartStruct");
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gRule2.style.setProperty(prop, info[higher_set][0], "");
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if ("prerequisites" in info) {
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for (var prereq in info.prerequisites) {
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gRule2.style.setProperty(prereq, gCSSProperties[prereq][higher_set][0], "");
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}
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}
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}
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}
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round("other_values", "initial_values", 1);
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round("initial_values", "other_values", 2);
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</script>
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</pre>
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</body>
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</html>
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