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