lepu-test-platform-web/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js

485 lines
14 KiB
JavaScript

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