485 lines
14 KiB
JavaScript
485 lines
14 KiB
JavaScript
var hasInherit = require('./has-inherit');
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var everyValuesPair = require('./every-values-pair');
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var findComponentIn = require('./find-component-in');
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var isComponentOf = require('./is-component-of');
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var isMergeableShorthand = require('./is-mergeable-shorthand');
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var overridesNonComponentShorthand = require('./overrides-non-component-shorthand');
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var sameVendorPrefixesIn = require('./vendor-prefixes').same;
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var compactable = require('../compactable');
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var deepClone = require('../clone').deep;
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var restoreWithComponents = require('../restore-with-components');
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var shallowClone = require('../clone').shallow;
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var restoreFromOptimizing = require('../../restore-from-optimizing');
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var Token = require('../../../tokenizer/token');
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var Marker = require('../../../tokenizer/marker');
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var serializeProperty = require('../../../writer/one-time').property;
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function wouldBreakCompatibility(property, validator) {
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for (var i = 0; i < property.components.length; i++) {
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var component = property.components[i];
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var descriptor = compactable[component.name];
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var canOverride = descriptor && descriptor.canOverride || canOverride.sameValue;
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var _component = shallowClone(component);
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_component.value = [[Token.PROPERTY_VALUE, descriptor.defaultValue]];
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if (!everyValuesPair(canOverride.bind(null, validator), _component, component)) {
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return true;
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}
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}
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return false;
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}
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function overrideIntoMultiplex(property, by) {
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by.unused = true;
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turnIntoMultiplex(by, multiplexSize(property));
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property.value = by.value;
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}
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function overrideByMultiplex(property, by) {
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by.unused = true;
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property.multiplex = true;
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property.value = by.value;
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}
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function overrideSimple(property, by) {
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by.unused = true;
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property.value = by.value;
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}
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function override(property, by) {
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if (by.multiplex)
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overrideByMultiplex(property, by);
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else if (property.multiplex)
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overrideIntoMultiplex(property, by);
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else
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overrideSimple(property, by);
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}
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function overrideShorthand(property, by) {
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by.unused = true;
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for (var i = 0, l = property.components.length; i < l; i++) {
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override(property.components[i], by.components[i], property.multiplex);
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}
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}
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function turnIntoMultiplex(property, size) {
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property.multiplex = true;
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if (compactable[property.name].shorthand) {
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turnShorthandValueIntoMultiplex(property, size);
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} else {
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turnLonghandValueIntoMultiplex(property, size);
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}
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}
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function turnShorthandValueIntoMultiplex(property, size) {
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var component;
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var i, l;
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for (i = 0, l = property.components.length; i < l; i++) {
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component = property.components[i];
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if (!component.multiplex) {
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turnLonghandValueIntoMultiplex(component, size);
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}
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}
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}
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function turnLonghandValueIntoMultiplex(property, size) {
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var descriptor = compactable[property.name];
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var withRealValue = descriptor.intoMultiplexMode == 'real';
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var withValue = descriptor.intoMultiplexMode == 'real' ?
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property.value.slice(0) :
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(descriptor.intoMultiplexMode == 'placeholder' ? descriptor.placeholderValue : descriptor.defaultValue);
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var i = multiplexSize(property);
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var j;
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var m = withValue.length;
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for (; i < size; i++) {
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property.value.push([Token.PROPERTY_VALUE, Marker.COMMA]);
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if (Array.isArray(withValue)) {
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for (j = 0; j < m; j++) {
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property.value.push(withRealValue ? withValue[j] : [Token.PROPERTY_VALUE, withValue[j]]);
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}
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} else {
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property.value.push(withRealValue ? withValue : [Token.PROPERTY_VALUE, withValue]);
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}
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}
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}
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function multiplexSize(component) {
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var size = 0;
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for (var i = 0, l = component.value.length; i < l; i++) {
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if (component.value[i][1] == Marker.COMMA)
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size++;
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}
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return size + 1;
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}
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function lengthOf(property) {
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var fakeAsArray = [
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Token.PROPERTY,
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[Token.PROPERTY_NAME, property.name]
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].concat(property.value);
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return serializeProperty([fakeAsArray], 0).length;
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}
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function moreSameShorthands(properties, startAt, name) {
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// Since we run the main loop in `compactOverrides` backwards, at this point some
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// properties may not be marked as unused.
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// We should consider reverting the order if possible
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var count = 0;
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for (var i = startAt; i >= 0; i--) {
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if (properties[i].name == name && !properties[i].unused)
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count++;
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if (count > 1)
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break;
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}
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return count > 1;
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}
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function overridingFunction(shorthand, validator) {
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for (var i = 0, l = shorthand.components.length; i < l; i++) {
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if (!anyValue(validator.isUrl, shorthand.components[i]) && anyValue(validator.isFunction, shorthand.components[i])) {
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return true;
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}
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}
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return false;
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}
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function anyValue(fn, property) {
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for (var i = 0, l = property.value.length; i < l; i++) {
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if (property.value[i][1] == Marker.COMMA)
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continue;
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if (fn(property.value[i][1]))
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return true;
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}
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return false;
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}
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function wouldResultInLongerValue(left, right) {
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if (!left.multiplex && !right.multiplex || left.multiplex && right.multiplex)
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return false;
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var multiplex = left.multiplex ? left : right;
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var simple = left.multiplex ? right : left;
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var component;
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var multiplexClone = deepClone(multiplex);
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restoreFromOptimizing([multiplexClone], restoreWithComponents);
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var simpleClone = deepClone(simple);
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restoreFromOptimizing([simpleClone], restoreWithComponents);
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var lengthBefore = lengthOf(multiplexClone) + 1 + lengthOf(simpleClone);
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if (left.multiplex) {
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component = findComponentIn(multiplexClone, simpleClone);
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overrideIntoMultiplex(component, simpleClone);
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} else {
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component = findComponentIn(simpleClone, multiplexClone);
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turnIntoMultiplex(simpleClone, multiplexSize(multiplexClone));
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overrideByMultiplex(component, multiplexClone);
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}
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restoreFromOptimizing([simpleClone], restoreWithComponents);
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var lengthAfter = lengthOf(simpleClone);
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return lengthBefore <= lengthAfter;
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}
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function isCompactable(property) {
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return property.name in compactable;
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}
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function noneOverrideHack(left, right) {
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return !left.multiplex &&
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(left.name == 'background' || left.name == 'background-image') &&
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right.multiplex &&
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(right.name == 'background' || right.name == 'background-image') &&
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anyLayerIsNone(right.value);
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}
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function anyLayerIsNone(values) {
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var layers = intoLayers(values);
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for (var i = 0, l = layers.length; i < l; i++) {
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if (layers[i].length == 1 && layers[i][0][1] == 'none')
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return true;
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}
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return false;
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}
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function intoLayers(values) {
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var layers = [];
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for (var i = 0, layer = [], l = values.length; i < l; i++) {
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var value = values[i];
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if (value[1] == Marker.COMMA) {
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layers.push(layer);
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layer = [];
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} else {
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layer.push(value);
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}
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}
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layers.push(layer);
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return layers;
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}
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function overrideProperties(properties, withMerging, compatibility, validator) {
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var mayOverride, right, left, component;
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var overriddenComponents;
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var overriddenComponent;
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var overridingComponent;
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var overridable;
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var i, j, k;
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propertyLoop:
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for (i = properties.length - 1; i >= 0; i--) {
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right = properties[i];
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if (!isCompactable(right))
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continue;
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if (right.block)
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continue;
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mayOverride = compactable[right.name].canOverride;
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traverseLoop:
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for (j = i - 1; j >= 0; j--) {
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left = properties[j];
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if (!isCompactable(left))
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continue;
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if (left.block)
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continue;
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if (left.unused || right.unused)
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continue;
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if (left.hack && !right.hack && !right.important || !left.hack && !left.important && right.hack)
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continue;
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if (left.important == right.important && left.hack[0] != right.hack[0])
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continue;
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if (left.important == right.important && (left.hack[0] != right.hack[0] || (left.hack[1] && left.hack[1] != right.hack[1])))
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continue;
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if (hasInherit(right))
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continue;
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if (noneOverrideHack(left, right))
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continue;
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if (right.shorthand && isComponentOf(right, left)) {
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// maybe `left` can be overridden by `right` which is a shorthand?
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if (!right.important && left.important)
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continue;
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if (!sameVendorPrefixesIn([left], right.components))
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continue;
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if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator))
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continue;
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if (!isMergeableShorthand(right)) {
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left.unused = true;
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continue;
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}
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component = findComponentIn(right, left);
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mayOverride = compactable[left.name].canOverride;
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if (everyValuesPair(mayOverride.bind(null, validator), left, component)) {
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left.unused = true;
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}
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} else if (right.shorthand && overridesNonComponentShorthand(right, left)) {
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// `right` is a shorthand while `left` can be overriden by it, think `border` and `border-top`
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if (!right.important && left.important) {
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continue;
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}
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if (!sameVendorPrefixesIn([left], right.components)) {
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continue;
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}
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if (!anyValue(validator.isFunction, left) && overridingFunction(right, validator)) {
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continue;
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}
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overriddenComponents = left.shorthand ?
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left.components:
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[left];
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for (k = overriddenComponents.length - 1; k >= 0; k--) {
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overriddenComponent = overriddenComponents[k];
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overridingComponent = findComponentIn(right, overriddenComponent);
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mayOverride = compactable[overriddenComponent.name].canOverride;
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if (!everyValuesPair(mayOverride.bind(null, validator), left, overridingComponent)) {
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continue traverseLoop;
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}
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}
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left.unused = true;
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} else if (withMerging && left.shorthand && !right.shorthand && isComponentOf(left, right, true)) {
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// maybe `right` can be pulled into `left` which is a shorthand?
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if (right.important && !left.important)
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continue;
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if (!right.important && left.important) {
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right.unused = true;
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continue;
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}
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// Pending more clever algorithm in #527
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if (moreSameShorthands(properties, i - 1, left.name))
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continue;
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if (overridingFunction(left, validator))
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continue;
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if (!isMergeableShorthand(left))
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continue;
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component = findComponentIn(left, right);
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if (everyValuesPair(mayOverride.bind(null, validator), component, right)) {
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var disabledBackgroundMerging =
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!compatibility.properties.backgroundClipMerging && component.name.indexOf('background-clip') > -1 ||
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!compatibility.properties.backgroundOriginMerging && component.name.indexOf('background-origin') > -1 ||
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!compatibility.properties.backgroundSizeMerging && component.name.indexOf('background-size') > -1;
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var nonMergeableValue = compactable[right.name].nonMergeableValue === right.value[0][1];
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if (disabledBackgroundMerging || nonMergeableValue)
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continue;
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if (!compatibility.properties.merging && wouldBreakCompatibility(left, validator))
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continue;
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if (component.value[0][1] != right.value[0][1] && (hasInherit(left) || hasInherit(right)))
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continue;
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if (wouldResultInLongerValue(left, right))
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continue;
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if (!left.multiplex && right.multiplex)
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turnIntoMultiplex(left, multiplexSize(right));
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override(component, right);
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left.dirty = true;
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}
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} else if (withMerging && left.shorthand && right.shorthand && left.name == right.name) {
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// merge if all components can be merged
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if (!left.multiplex && right.multiplex)
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continue;
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if (!right.important && left.important) {
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right.unused = true;
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continue propertyLoop;
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}
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if (right.important && !left.important) {
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left.unused = true;
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continue;
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}
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if (!isMergeableShorthand(right)) {
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left.unused = true;
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continue;
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}
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for (k = left.components.length - 1; k >= 0; k--) {
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var leftComponent = left.components[k];
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var rightComponent = right.components[k];
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mayOverride = compactable[leftComponent.name].canOverride;
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if (!everyValuesPair(mayOverride.bind(null, validator), leftComponent, rightComponent))
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continue propertyLoop;
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}
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overrideShorthand(left, right);
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left.dirty = true;
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} else if (withMerging && left.shorthand && right.shorthand && isComponentOf(left, right)) {
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// border is a shorthand but any of its components is a shorthand too
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if (!left.important && right.important)
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continue;
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component = findComponentIn(left, right);
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mayOverride = compactable[right.name].canOverride;
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if (!everyValuesPair(mayOverride.bind(null, validator), component, right))
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continue;
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if (left.important && !right.important) {
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right.unused = true;
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continue;
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}
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var rightRestored = compactable[right.name].restore(right, compactable);
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if (rightRestored.length > 1)
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continue;
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component = findComponentIn(left, right);
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override(component, right);
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right.dirty = true;
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} else if (left.name == right.name) {
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// two non-shorthands should be merged based on understandability
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overridable = true;
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if (right.shorthand) {
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for (k = right.components.length - 1; k >= 0 && overridable; k--) {
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overriddenComponent = left.components[k];
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overridingComponent = right.components[k];
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mayOverride = compactable[overridingComponent.name].canOverride;
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overridable = overridable && everyValuesPair(mayOverride.bind(null, validator), overriddenComponent, overridingComponent);
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}
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} else {
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mayOverride = compactable[right.name].canOverride;
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overridable = everyValuesPair(mayOverride.bind(null, validator), left, right);
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}
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if (left.important && !right.important && overridable) {
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right.unused = true;
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continue;
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}
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if (!left.important && right.important && overridable) {
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left.unused = true;
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continue;
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}
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if (!overridable) {
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continue;
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}
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left.unused = true;
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}
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}
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}
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}
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module.exports = overrideProperties;
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