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