merge-into-shorthands.js
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var everyValuesPair = require('./every-values-pair');
var hasInherit = require('./has-inherit');
var populateComponents = require('./populate-components');
var compactable = require('../compactable');
var deepClone = require('../clone').deep;
var wrapSingle = require('../../wrap-for-optimizing').single;
var Token = require('../../../tokenizer/token');
function mixedImportance(components) {
var important;
for (var name in components) {
if (undefined !== important && components[name].important != important)
return true;
important = components[name].important;
}
return false;
}
function joinMetadata(components, at) {
var metadata = [];
var component;
var originalValue;
var componentMetadata;
var name;
for (name in components) {
component = components[name];
originalValue = component.all[component.position];
componentMetadata = originalValue[at][originalValue[at].length - 1];
Array.prototype.push.apply(metadata, componentMetadata);
}
return metadata;
}
function replaceWithShorthand(properties, candidateComponents, name, validator) {
var descriptor = compactable[name];
var nameMetadata;
var valueMetadata;
var newValuePlaceholder = [
Token.PROPERTY,
[Token.PROPERTY_NAME, name],
[Token.PROPERTY_VALUE, descriptor.defaultValue]
];
var mayOverride;
var all;
var newProperty = wrapSingle(newValuePlaceholder);
newProperty.shorthand = true;
newProperty.dirty = true;
populateComponents([newProperty], validator, []);
for (var i = 0, l = descriptor.components.length; i < l; i++) {
var component = candidateComponents[descriptor.components[i]];
if (hasInherit(component))
return;
mayOverride = compactable[component.name].canOverride;
if (!everyValuesPair(mayOverride.bind(null, validator), newProperty.components[i], component))
return;
newProperty.components[i] = deepClone(component);
newProperty.important = component.important;
all = component.all;
}
for (var componentName in candidateComponents) {
candidateComponents[componentName].unused = true;
}
nameMetadata = joinMetadata(candidateComponents, 1);
newValuePlaceholder[1].push(nameMetadata);
valueMetadata = joinMetadata(candidateComponents, 2);
newValuePlaceholder[2].push(valueMetadata);
newProperty.position = all.length;
newProperty.all = all;
newProperty.all.push(newValuePlaceholder);
properties.push(newProperty);
}
function invalidateOrCompact(properties, position, candidates, validator) {
var property = properties[position];
for (var name in candidates) {
if (undefined !== property && name == property.name)
continue;
var descriptor = compactable[name];
var candidateComponents = candidates[name];
if (descriptor.components.length > Object.keys(candidateComponents).length) {
delete candidates[name];
continue;
}
if (mixedImportance(candidateComponents))
continue;
replaceWithShorthand(properties, candidateComponents, name, validator);
}
}
function mergeIntoShorthands(properties, validator) {
var candidates = {};
var descriptor;
var componentOf;
var property;
var i, l;
var j, m;
if (properties.length < 3)
return;
for (i = 0, l = properties.length; i < l; i++) {
property = properties[i];
if (property.unused)
continue;
if (property.hack)
continue;
if (property.block)
continue;
descriptor = compactable[property.name];
if (!descriptor || !descriptor.componentOf)
continue;
if (property.shorthand) {
invalidateOrCompact(properties, i, candidates, validator);
} else {
for (j = 0, m = descriptor.componentOf.length; j < m; j++) {
componentOf = descriptor.componentOf[j];
candidates[componentOf] = candidates[componentOf] || {};
candidates[componentOf][property.name] = property;
}
}
}
invalidateOrCompact(properties, i, candidates, validator);
}
module.exports = mergeIntoShorthands;