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303 lines
9.6 KiB
303 lines
9.6 KiB
var shallowClone = require('./clone').shallow;
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var Token = require('../../tokenizer/token');
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var Marker = require('../../tokenizer/marker');
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function isInheritOnly(values) {
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for (var i = 0, l = values.length; i < l; i++) {
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var value = values[i][1];
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if (value != 'inherit' && value != Marker.COMMA && value != Marker.FORWARD_SLASH)
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return false;
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}
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return true;
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}
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function background(property, compactable, lastInMultiplex) {
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var components = property.components;
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var restored = [];
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var needsOne, needsBoth;
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function restoreValue(component) {
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Array.prototype.unshift.apply(restored, component.value);
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}
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function isDefaultValue(component) {
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var descriptor = compactable[component.name];
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if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
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return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] == descriptor.defaultValue[0] : true);
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} else if (descriptor.doubleValues && descriptor.defaultValue.length != 1) {
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return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] : component.value[0][1]) == descriptor.defaultValue[1];
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} else {
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return component.value[0][1] == descriptor.defaultValue;
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}
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}
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for (var i = components.length - 1; i >= 0; i--) {
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var component = components[i];
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var isDefault = isDefaultValue(component);
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if (component.name == 'background-clip') {
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var originComponent = components[i - 1];
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var isOriginDefault = isDefaultValue(originComponent);
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needsOne = component.value[0][1] == originComponent.value[0][1];
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needsBoth = !needsOne && (
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(isOriginDefault && !isDefault) ||
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(!isOriginDefault && !isDefault) ||
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(!isOriginDefault && isDefault && component.value[0][1] != originComponent.value[0][1]));
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if (needsOne) {
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restoreValue(originComponent);
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} else if (needsBoth) {
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restoreValue(component);
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restoreValue(originComponent);
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}
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i--;
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} else if (component.name == 'background-size') {
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var positionComponent = components[i - 1];
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var isPositionDefault = isDefaultValue(positionComponent);
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needsOne = !isPositionDefault && isDefault;
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needsBoth = !needsOne &&
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(isPositionDefault && !isDefault || !isPositionDefault && !isDefault);
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if (needsOne) {
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restoreValue(positionComponent);
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} else if (needsBoth) {
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restoreValue(component);
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restored.unshift([Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]);
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restoreValue(positionComponent);
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} else if (positionComponent.value.length == 1) {
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restoreValue(positionComponent);
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}
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i--;
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} else {
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if (isDefault || compactable[component.name].multiplexLastOnly && !lastInMultiplex)
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continue;
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restoreValue(component);
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}
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}
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if (restored.length === 0 && property.value.length == 1 && property.value[0][1] == '0')
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restored.push(property.value[0]);
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if (restored.length === 0)
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restored.push([Token.PROPERTY_VALUE, compactable[property.name].defaultValue]);
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if (isInheritOnly(restored))
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return [restored[0]];
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return restored;
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}
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function borderRadius(property, compactable) {
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if (property.multiplex) {
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var horizontal = shallowClone(property);
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var vertical = shallowClone(property);
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for (var i = 0; i < 4; i++) {
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var component = property.components[i];
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var horizontalComponent = shallowClone(property);
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horizontalComponent.value = [component.value[0]];
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horizontal.components.push(horizontalComponent);
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var verticalComponent = shallowClone(property);
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// FIXME: only shorthand compactor (see breakup#borderRadius) knows that border radius
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// longhands have two values, whereas tokenizer does not care about populating 2nd value
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// if it's missing, hence this fallback
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verticalComponent.value = [component.value[1] || component.value[0]];
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vertical.components.push(verticalComponent);
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}
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var horizontalValues = fourValues(horizontal, compactable);
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var verticalValues = fourValues(vertical, compactable);
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if (horizontalValues.length == verticalValues.length &&
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horizontalValues[0][1] == verticalValues[0][1] &&
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(horizontalValues.length > 1 ? horizontalValues[1][1] == verticalValues[1][1] : true) &&
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(horizontalValues.length > 2 ? horizontalValues[2][1] == verticalValues[2][1] : true) &&
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(horizontalValues.length > 3 ? horizontalValues[3][1] == verticalValues[3][1] : true)) {
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return horizontalValues;
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} else {
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return horizontalValues.concat([[Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]]).concat(verticalValues);
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}
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} else {
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return fourValues(property, compactable);
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}
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}
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function font(property, compactable) {
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var components = property.components;
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var restored = [];
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var component;
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var componentIndex = 0;
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var fontFamilyIndex = 0;
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if (property.value[0][1].indexOf(Marker.INTERNAL) === 0) {
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property.value[0][1] = property.value[0][1].substring(Marker.INTERNAL.length);
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return property.value;
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}
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// first four components are optional
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while (componentIndex < 4) {
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component = components[componentIndex];
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if (component.value[0][1] != compactable[component.name].defaultValue) {
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Array.prototype.push.apply(restored, component.value);
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}
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componentIndex++;
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}
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// then comes font-size
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Array.prototype.push.apply(restored, components[componentIndex].value);
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componentIndex++;
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// then may come line-height
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if (components[componentIndex].value[0][1] != compactable[components[componentIndex].name].defaultValue) {
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Array.prototype.push.apply(restored, [[Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]]);
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Array.prototype.push.apply(restored, components[componentIndex].value);
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}
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componentIndex++;
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// then comes font-family
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while (components[componentIndex].value[fontFamilyIndex]) {
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restored.push(components[componentIndex].value[fontFamilyIndex]);
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if (components[componentIndex].value[fontFamilyIndex + 1]) {
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restored.push([Token.PROPERTY_VALUE, Marker.COMMA]);
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}
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fontFamilyIndex++;
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}
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if (isInheritOnly(restored)) {
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return [restored[0]];
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}
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return restored;
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}
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function fourValues(property) {
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var components = property.components;
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var value1 = components[0].value[0];
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var value2 = components[1].value[0];
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var value3 = components[2].value[0];
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var value4 = components[3].value[0];
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if (value1[1] == value2[1] && value1[1] == value3[1] && value1[1] == value4[1]) {
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return [value1];
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} else if (value1[1] == value3[1] && value2[1] == value4[1]) {
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return [value1, value2];
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} else if (value2[1] == value4[1]) {
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return [value1, value2, value3];
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} else {
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return [value1, value2, value3, value4];
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}
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}
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function multiplex(restoreWith) {
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return function (property, compactable) {
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if (!property.multiplex)
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return restoreWith(property, compactable, true);
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var multiplexSize = 0;
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var restored = [];
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var componentMultiplexSoFar = {};
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var i, l;
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// At this point we don't know what's the multiplex size, e.g. how many background layers are there
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for (i = 0, l = property.components[0].value.length; i < l; i++) {
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if (property.components[0].value[i][1] == Marker.COMMA)
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multiplexSize++;
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}
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for (i = 0; i <= multiplexSize; i++) {
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var _property = shallowClone(property);
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// We split multiplex into parts and restore them one by one
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for (var j = 0, m = property.components.length; j < m; j++) {
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var componentToClone = property.components[j];
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var _component = shallowClone(componentToClone);
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_property.components.push(_component);
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// The trick is some properties has more than one value, so we iterate over values looking for
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// a multiplex separator - a comma
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for (var k = componentMultiplexSoFar[_component.name] || 0, n = componentToClone.value.length; k < n; k++) {
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if (componentToClone.value[k][1] == Marker.COMMA) {
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componentMultiplexSoFar[_component.name] = k + 1;
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break;
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}
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_component.value.push(componentToClone.value[k]);
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}
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}
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// No we can restore shorthand value
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var lastInMultiplex = i == multiplexSize;
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var _restored = restoreWith(_property, compactable, lastInMultiplex);
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Array.prototype.push.apply(restored, _restored);
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if (i < multiplexSize)
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restored.push([Token.PROPERTY_VALUE, Marker.COMMA]);
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}
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return restored;
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};
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}
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function withoutDefaults(property, compactable) {
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var components = property.components;
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var restored = [];
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for (var i = components.length - 1; i >= 0; i--) {
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var component = components[i];
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var descriptor = compactable[component.name];
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if (component.value[0][1] != descriptor.defaultValue || ('keepUnlessDefault' in descriptor) && !isDefault(components, compactable, descriptor.keepUnlessDefault)) {
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restored.unshift(component.value[0]);
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}
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}
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if (restored.length === 0)
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restored.push([Token.PROPERTY_VALUE, compactable[property.name].defaultValue]);
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if (isInheritOnly(restored))
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return [restored[0]];
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return restored;
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}
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function isDefault(components, compactable, propertyName) {
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var component;
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var i, l;
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for (i = 0, l = components.length; i < l; i++) {
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component = components[i];
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if (component.name == propertyName && component.value[0][1] == compactable[propertyName].defaultValue) {
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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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module.exports = {
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background: background,
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borderRadius: borderRadius,
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font: font,
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fourValues: fourValues,
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multiplex: multiplex,
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withoutDefaults: withoutDefaults
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};
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