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exports.name = "Color use";
exports.description = "Use colors that have sufficient contrast and avoid issues with common forms of color blindness.";
var fc = fiveui.color;
var AA_RATIO = 4.5;
var AAA_RATIO = 7;
exports.rule = function (report) {
$5('#mw-content-text *')
// filter for lowest level elts having non-empty text
.filter(function () {
var $this = $(this);
return $this.children().length == 0 && $.trim($this.text()).length > 0;
})
.filter(exceptions)
.each(function (i) {
var fg = fc.colorToRGB($(this).css('color'));
var bg = fc.findBGColor($(this));
if (fg && bg) {
var ratio = fc.contrast(fc.luminance(fg), fc.luminance(bg));
if (ratio < AA_RATIO) {
report.error('Element has poor contrast: ' + ratio +
" ratio should be greater than " + AA_RATIO, this);
} else if (ratio < AAA_RATIO){
report.warning('Element has poor contrast: ' + ratio +
" ratio should be greater than " + AAA_RATIO, this);
}
}
});
};
function exceptions() {
var $elem = $(this);
return !isStandardLink($elem) &&
!isNavboxLink($elem);
}
function isStandardLink($elem) {
var standard = ['new', 'external', 'extiw'];
var $a = $elem.closest('a');
return $a.is('a') && standard.some(function(klass) {
return $a.hasClass(klass);
});
}
function isNavboxLink($elem) {
var $a = $elem.closest('a');
var $nav = $a.closest('th.navbox-group');
return $a.length > 0 && $nav.length > 0;
}
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