426 lines
12 KiB
JavaScript
426 lines
12 KiB
JavaScript
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import { List, generate, walk } from 'css-tree';
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const REPLACE = 1;
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const REMOVE = 2;
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const TOP = 0;
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const RIGHT = 1;
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const BOTTOM = 2;
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const LEFT = 3;
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const SIDES = ['top', 'right', 'bottom', 'left'];
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const SIDE = {
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'margin-top': 'top',
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'margin-right': 'right',
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'margin-bottom': 'bottom',
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'margin-left': 'left',
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'padding-top': 'top',
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'padding-right': 'right',
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'padding-bottom': 'bottom',
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'padding-left': 'left',
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'border-top-color': 'top',
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'border-right-color': 'right',
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'border-bottom-color': 'bottom',
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'border-left-color': 'left',
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'border-top-width': 'top',
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'border-right-width': 'right',
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'border-bottom-width': 'bottom',
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'border-left-width': 'left',
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'border-top-style': 'top',
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'border-right-style': 'right',
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'border-bottom-style': 'bottom',
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'border-left-style': 'left'
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};
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const MAIN_PROPERTY = {
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'margin': 'margin',
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'margin-top': 'margin',
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'margin-right': 'margin',
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'margin-bottom': 'margin',
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'margin-left': 'margin',
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'padding': 'padding',
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'padding-top': 'padding',
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'padding-right': 'padding',
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'padding-bottom': 'padding',
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'padding-left': 'padding',
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'border-color': 'border-color',
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'border-top-color': 'border-color',
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'border-right-color': 'border-color',
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'border-bottom-color': 'border-color',
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'border-left-color': 'border-color',
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'border-width': 'border-width',
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'border-top-width': 'border-width',
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'border-right-width': 'border-width',
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'border-bottom-width': 'border-width',
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'border-left-width': 'border-width',
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'border-style': 'border-style',
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'border-top-style': 'border-style',
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'border-right-style': 'border-style',
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'border-bottom-style': 'border-style',
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'border-left-style': 'border-style'
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};
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class TRBL {
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constructor(name) {
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this.name = name;
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this.loc = null;
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this.iehack = undefined;
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this.sides = {
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'top': null,
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'right': null,
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'bottom': null,
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'left': null
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};
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}
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getValueSequence(declaration, count) {
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const values = [];
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let iehack = '';
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const hasBadValues = declaration.value.type !== 'Value' || declaration.value.children.some(function(child) {
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let special = false;
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switch (child.type) {
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case 'Identifier':
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switch (child.name) {
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case '\\0':
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case '\\9':
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iehack = child.name;
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return;
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case 'inherit':
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case 'initial':
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case 'unset':
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case 'revert':
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special = child.name;
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break;
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}
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break;
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case 'Dimension':
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switch (child.unit) {
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// is not supported until IE11
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case 'rem':
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// v* units is too buggy across browsers and better
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// don't merge values with those units
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case 'vw':
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case 'vh':
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case 'vmin':
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case 'vmax':
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case 'vm': // IE9 supporting "vm" instead of "vmin".
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special = child.unit;
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break;
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}
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break;
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case 'Hash': // color
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case 'Number':
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case 'Percentage':
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break;
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case 'Function':
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if (child.name === 'var') {
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return true;
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}
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special = child.name;
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break;
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default:
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return true; // bad value
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}
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values.push({
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node: child,
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special,
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important: declaration.important
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});
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});
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if (hasBadValues || values.length > count) {
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return false;
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}
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if (typeof this.iehack === 'string' && this.iehack !== iehack) {
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return false;
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}
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this.iehack = iehack; // move outside
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return values;
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}
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canOverride(side, value) {
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const currentValue = this.sides[side];
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return !currentValue || (value.important && !currentValue.important);
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}
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add(name, declaration) {
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function attemptToAdd() {
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const sides = this.sides;
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const side = SIDE[name];
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if (side) {
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if (side in sides === false) {
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return false;
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}
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const values = this.getValueSequence(declaration, 1);
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if (!values || !values.length) {
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return false;
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}
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// can mix only if specials are equal
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for (const key in sides) {
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if (sides[key] !== null && sides[key].special !== values[0].special) {
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return false;
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}
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}
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if (!this.canOverride(side, values[0])) {
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return true;
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}
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sides[side] = values[0];
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return true;
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} else if (name === this.name) {
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const values = this.getValueSequence(declaration, 4);
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if (!values || !values.length) {
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return false;
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}
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switch (values.length) {
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case 1:
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values[RIGHT] = values[TOP];
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values[BOTTOM] = values[TOP];
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values[LEFT] = values[TOP];
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break;
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case 2:
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values[BOTTOM] = values[TOP];
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values[LEFT] = values[RIGHT];
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break;
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case 3:
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values[LEFT] = values[RIGHT];
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break;
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}
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// can mix only if specials are equal
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for (let i = 0; i < 4; i++) {
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for (const key in sides) {
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if (sides[key] !== null && sides[key].special !== values[i].special) {
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return false;
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}
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}
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}
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for (let i = 0; i < 4; i++) {
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if (this.canOverride(SIDES[i], values[i])) {
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sides[SIDES[i]] = values[i];
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}
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}
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return true;
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}
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}
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if (!attemptToAdd.call(this)) {
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return false;
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}
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// TODO: use it when we can refer to several points in source
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// if (this.loc) {
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// this.loc = {
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// primary: this.loc,
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// merged: declaration.loc
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// };
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// } else {
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// this.loc = declaration.loc;
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// }
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if (!this.loc) {
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this.loc = declaration.loc;
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}
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return true;
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}
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isOkToMinimize() {
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const top = this.sides.top;
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const right = this.sides.right;
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const bottom = this.sides.bottom;
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const left = this.sides.left;
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if (top && right && bottom && left) {
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const important =
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top.important +
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right.important +
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bottom.important +
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left.important;
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return important === 0 || important === 4;
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}
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return false;
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}
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getValue() {
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const result = new List();
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const sides = this.sides;
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const values = [
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sides.top,
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sides.right,
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sides.bottom,
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sides.left
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];
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const stringValues = [
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generate(sides.top.node),
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generate(sides.right.node),
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generate(sides.bottom.node),
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generate(sides.left.node)
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];
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if (stringValues[LEFT] === stringValues[RIGHT]) {
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values.pop();
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if (stringValues[BOTTOM] === stringValues[TOP]) {
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values.pop();
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if (stringValues[RIGHT] === stringValues[TOP]) {
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values.pop();
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}
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}
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}
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for (let i = 0; i < values.length; i++) {
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result.appendData(values[i].node);
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}
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if (this.iehack) {
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result.appendData({
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type: 'Identifier',
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loc: null,
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name: this.iehack
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});
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}
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return {
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type: 'Value',
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loc: null,
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children: result
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};
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}
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getDeclaration() {
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return {
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type: 'Declaration',
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loc: this.loc,
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important: this.sides.top.important,
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property: this.name,
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value: this.getValue()
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};
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}
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}
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function processRule(rule, shorts, shortDeclarations, lastShortSelector) {
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const declarations = rule.block.children;
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const selector = rule.prelude.children.first.id;
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rule.block.children.forEachRight(function(declaration, item) {
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const property = declaration.property;
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if (!MAIN_PROPERTY.hasOwnProperty(property)) {
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return;
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}
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const key = MAIN_PROPERTY[property];
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let shorthand;
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let operation;
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if (!lastShortSelector || selector === lastShortSelector) {
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if (key in shorts) {
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operation = REMOVE;
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shorthand = shorts[key];
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}
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}
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if (!shorthand || !shorthand.add(property, declaration)) {
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operation = REPLACE;
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shorthand = new TRBL(key);
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// if can't parse value ignore it and break shorthand children
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if (!shorthand.add(property, declaration)) {
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lastShortSelector = null;
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return;
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}
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}
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shorts[key] = shorthand;
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shortDeclarations.push({
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operation,
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block: declarations,
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item,
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shorthand
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});
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lastShortSelector = selector;
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});
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return lastShortSelector;
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}
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function processShorthands(shortDeclarations, markDeclaration) {
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shortDeclarations.forEach(function(item) {
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const shorthand = item.shorthand;
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if (!shorthand.isOkToMinimize()) {
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return;
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}
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if (item.operation === REPLACE) {
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item.item.data = markDeclaration(shorthand.getDeclaration());
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} else {
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item.block.remove(item.item);
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}
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});
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}
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export default function restructBlock(ast, indexer) {
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const stylesheetMap = {};
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const shortDeclarations = [];
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walk(ast, {
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visit: 'Rule',
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reverse: true,
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enter(node) {
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const stylesheet = this.block || this.stylesheet;
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const ruleId = (node.pseudoSignature || '') + '|' + node.prelude.children.first.id;
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let ruleMap;
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let shorts;
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if (!stylesheetMap.hasOwnProperty(stylesheet.id)) {
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ruleMap = {
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lastShortSelector: null
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};
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stylesheetMap[stylesheet.id] = ruleMap;
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} else {
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ruleMap = stylesheetMap[stylesheet.id];
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}
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if (ruleMap.hasOwnProperty(ruleId)) {
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shorts = ruleMap[ruleId];
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} else {
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shorts = {};
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ruleMap[ruleId] = shorts;
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}
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ruleMap.lastShortSelector = processRule.call(this, node, shorts, shortDeclarations, ruleMap.lastShortSelector);
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}
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});
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processShorthands(shortDeclarations, indexer.declaration);
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};
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