mirror of
https://github.com/less/less.js.git
synced 2026-01-22 13:48:03 -05:00
ead3e29f7b
- refactored how import reference works - refactored to-css-visitor (this is side product, it was getting complicated) - fixes issues #1851, #1896, #1878, #2716, #1968, #2162 (same as #1896)
706 lines
25 KiB
JavaScript
706 lines
25 KiB
JavaScript
var Node = require("./node"),
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Rule = require("./rule"),
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Selector = require("./selector"),
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Element = require("./element"),
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Paren = require("./paren"),
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contexts = require("../contexts"),
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globalFunctionRegistry = require("../functions/function-registry"),
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defaultFunc = require("../functions/default"),
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getDebugInfo = require("./debug-info");
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var Ruleset = function (selectors, rules, strictImports, visibilityInfo) {
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this.selectors = selectors;
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this.rules = rules;
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this._lookups = {};
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this.strictImports = strictImports;
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this.copyVisibilityInfo(visibilityInfo);
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};
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Ruleset.prototype = new Node();
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Ruleset.prototype.type = "Ruleset";
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Ruleset.prototype.isRuleset = true;
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Ruleset.prototype.isRulesetLike = true;
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Ruleset.prototype.accept = function (visitor) {
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if (this.paths) {
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this.paths = visitor.visitArray(this.paths, true);
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} else if (this.selectors) {
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this.selectors = visitor.visitArray(this.selectors);
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}
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if (this.rules && this.rules.length) {
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this.rules = visitor.visitArray(this.rules);
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}
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};
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Ruleset.prototype.eval = function (context) {
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var thisSelectors = this.selectors, selectors,
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selCnt, selector, i, hasOnePassingSelector = false;
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if (thisSelectors && (selCnt = thisSelectors.length)) {
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selectors = [];
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defaultFunc.error({
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type: "Syntax",
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message: "it is currently only allowed in parametric mixin guards,"
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});
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for (i = 0; i < selCnt; i++) {
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selector = thisSelectors[i].eval(context);
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selectors.push(selector);
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if (selector.evaldCondition) {
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hasOnePassingSelector = true;
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}
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}
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defaultFunc.reset();
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} else {
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hasOnePassingSelector = true;
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}
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var rules = this.rules ? this.rules.slice(0) : null,
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ruleset = new Ruleset(selectors, rules, this.strictImports, this.visibilityInfo()),
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rule, subRule;
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ruleset.originalRuleset = this;
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ruleset.root = this.root;
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ruleset.firstRoot = this.firstRoot;
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ruleset.allowImports = this.allowImports;
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if (this.debugInfo) {
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ruleset.debugInfo = this.debugInfo;
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}
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if (!hasOnePassingSelector) {
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rules.length = 0;
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}
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// inherit a function registry from the frames stack when possible;
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// otherwise from the global registry
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ruleset.functionRegistry = (function (frames) {
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var i = 0,
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n = frames.length,
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found;
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for ( ; i !== n ; ++i ) {
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found = frames[ i ].functionRegistry;
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if ( found ) { return found; }
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}
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return globalFunctionRegistry;
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}(context.frames)).inherit();
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// push the current ruleset to the frames stack
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var ctxFrames = context.frames;
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ctxFrames.unshift(ruleset);
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// currrent selectors
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var ctxSelectors = context.selectors;
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if (!ctxSelectors) {
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context.selectors = ctxSelectors = [];
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}
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ctxSelectors.unshift(this.selectors);
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// Evaluate imports
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if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
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ruleset.evalImports(context);
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}
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// Store the frames around mixin definitions,
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// so they can be evaluated like closures when the time comes.
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var rsRules = ruleset.rules, rsRuleCnt = rsRules ? rsRules.length : 0;
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for (i = 0; i < rsRuleCnt; i++) {
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if (rsRules[i].evalFirst) {
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rsRules[i] = rsRules[i].eval(context);
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}
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}
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var mediaBlockCount = (context.mediaBlocks && context.mediaBlocks.length) || 0;
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// Evaluate mixin calls.
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for (i = 0; i < rsRuleCnt; i++) {
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if (rsRules[i].type === "MixinCall") {
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/*jshint loopfunc:true */
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rules = rsRules[i].eval(context).filter(function(r) {
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if ((r instanceof Rule) && r.variable) {
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// do not pollute the scope if the variable is
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// already there. consider returning false here
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// but we need a way to "return" variable from mixins
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return !(ruleset.variable(r.name));
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}
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return true;
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});
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rsRules.splice.apply(rsRules, [i, 1].concat(rules));
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rsRuleCnt += rules.length - 1;
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i += rules.length - 1;
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ruleset.resetCache();
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} else if (rsRules[i].type === "RulesetCall") {
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/*jshint loopfunc:true */
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rules = rsRules[i].eval(context).rules.filter(function(r) {
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if ((r instanceof Rule) && r.variable) {
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// do not pollute the scope at all
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return false;
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}
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return true;
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});
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rsRules.splice.apply(rsRules, [i, 1].concat(rules));
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rsRuleCnt += rules.length - 1;
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i += rules.length - 1;
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ruleset.resetCache();
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}
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}
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// Evaluate everything else
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for (i = 0; i < rsRules.length; i++) {
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rule = rsRules[i];
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if (!rule.evalFirst) {
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rsRules[i] = rule = rule.eval ? rule.eval(context) : rule;
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}
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}
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// Evaluate everything else
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for (i = 0; i < rsRules.length; i++) {
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rule = rsRules[i];
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// for rulesets, check if it is a css guard and can be removed
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if (rule instanceof Ruleset && rule.selectors && rule.selectors.length === 1) {
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// check if it can be folded in (e.g. & where)
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if (rule.selectors[0].isJustParentSelector()) {
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rsRules.splice(i--, 1);
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for (var j = 0; j < rule.rules.length; j++) {
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subRule = rule.rules[j];
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subRule.copyVisibilityInfo(rule.visibilityInfo());
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if (!(subRule instanceof Rule) || !subRule.variable) {
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rsRules.splice(++i, 0, subRule);
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}
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}
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}
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}
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}
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// Pop the stack
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ctxFrames.shift();
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ctxSelectors.shift();
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if (context.mediaBlocks) {
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for (i = mediaBlockCount; i < context.mediaBlocks.length; i++) {
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context.mediaBlocks[i].bubbleSelectors(selectors);
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}
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}
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return ruleset;
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};
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Ruleset.prototype.evalImports = function(context) {
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var rules = this.rules, i, importRules;
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if (!rules) { return; }
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for (i = 0; i < rules.length; i++) {
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if (rules[i].type === "Import") {
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importRules = rules[i].eval(context);
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if (importRules && (importRules.length || importRules.length === 0)) {
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rules.splice.apply(rules, [i, 1].concat(importRules));
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i+= importRules.length - 1;
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} else {
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rules.splice(i, 1, importRules);
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}
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this.resetCache();
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}
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}
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};
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Ruleset.prototype.makeImportant = function() {
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var result = new Ruleset(this.selectors, this.rules.map(function (r) {
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if (r.makeImportant) {
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return r.makeImportant();
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} else {
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return r;
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}
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}), this.strictImports, this.visibilityInfo());
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return result;
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};
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Ruleset.prototype.matchArgs = function (args) {
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return !args || args.length === 0;
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};
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// lets you call a css selector with a guard
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Ruleset.prototype.matchCondition = function (args, context) {
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var lastSelector = this.selectors[this.selectors.length - 1];
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if (!lastSelector.evaldCondition) {
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return false;
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}
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if (lastSelector.condition &&
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!lastSelector.condition.eval(
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new contexts.Eval(context,
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context.frames))) {
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return false;
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}
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return true;
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};
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Ruleset.prototype.resetCache = function () {
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this._rulesets = null;
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this._variables = null;
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this._lookups = {};
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};
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Ruleset.prototype.variables = function () {
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if (!this._variables) {
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this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
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if (r instanceof Rule && r.variable === true) {
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hash[r.name] = r;
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}
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// when evaluating variables in an import statement, imports have not been eval'd
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// so we need to go inside import statements.
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// guard against root being a string (in the case of inlined less)
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if (r.type === "Import" && r.root && r.root.variables) {
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var vars = r.root.variables();
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for (var name in vars) {
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if (vars.hasOwnProperty(name)) {
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hash[name] = vars[name];
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}
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}
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}
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return hash;
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}, {});
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}
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return this._variables;
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};
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Ruleset.prototype.variable = function (name) {
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return this.variables()[name];
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};
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Ruleset.prototype.rulesets = function () {
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if (!this.rules) { return []; }
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var filtRules = [], rules = this.rules, cnt = rules.length,
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i, rule;
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for (i = 0; i < cnt; i++) {
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rule = rules[i];
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if (rule.isRuleset) {
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filtRules.push(rule);
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}
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}
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return filtRules;
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};
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Ruleset.prototype.prependRule = function (rule) {
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var rules = this.rules;
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if (rules) {
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rules.unshift(rule);
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} else {
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this.rules = [ rule ];
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}
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};
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Ruleset.prototype.find = function (selector, self, filter) {
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self = self || this;
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var rules = [], match, foundMixins,
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key = selector.toCSS();
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if (key in this._lookups) { return this._lookups[key]; }
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this.rulesets().forEach(function (rule) {
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if (rule !== self) {
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for (var j = 0; j < rule.selectors.length; j++) {
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match = selector.match(rule.selectors[j]);
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if (match) {
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if (selector.elements.length > match) {
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if (!filter || filter(rule)) {
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foundMixins = rule.find(new Selector(selector.elements.slice(match)), self, filter);
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for (var i = 0; i < foundMixins.length; ++i) {
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foundMixins[i].path.push(rule);
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}
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Array.prototype.push.apply(rules, foundMixins);
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}
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} else {
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rules.push({ rule: rule, path: []});
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}
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break;
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}
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}
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}
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});
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this._lookups[key] = rules;
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return rules;
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};
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Ruleset.prototype.genCSS = function (context, output) {
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var i, j,
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charsetRuleNodes = [],
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ruleNodes = [],
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debugInfo, // Line number debugging
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rule,
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path;
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context.tabLevel = (context.tabLevel || 0);
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if (!this.root) {
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context.tabLevel++;
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}
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var tabRuleStr = context.compress ? '' : Array(context.tabLevel + 1).join(" "),
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tabSetStr = context.compress ? '' : Array(context.tabLevel).join(" "),
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sep;
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function isRulesetLikeNode(rule) {
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// if it has nested rules, then it should be treated like a ruleset
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// medias and comments do not have nested rules, but should be treated like rulesets anyway
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// some directives and anonymous nodes are ruleset like, others are not
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if (typeof rule.isRulesetLike === "boolean") {
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return rule.isRulesetLike;
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} else if (typeof rule.isRulesetLike === "function") {
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return rule.isRulesetLike();
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}
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//anything else is assumed to be a rule
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return false;
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}
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var charsetNodeIndex = 0;
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var importNodeIndex = 0;
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for (i = 0; i < this.rules.length; i++) {
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rule = this.rules[i];
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if (rule.type === "Comment") {
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if (importNodeIndex === i) {
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importNodeIndex++;
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}
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ruleNodes.push(rule);
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} else if (rule.isCharset && rule.isCharset()) {
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ruleNodes.splice(charsetNodeIndex, 0, rule);
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charsetNodeIndex++;
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importNodeIndex++;
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} else if (rule.type === "Import") {
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ruleNodes.splice(importNodeIndex, 0, rule);
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importNodeIndex++;
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} else {
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ruleNodes.push(rule);
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}
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}
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ruleNodes = charsetRuleNodes.concat(ruleNodes);
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// If this is the root node, we don't render
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// a selector, or {}.
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if (!this.root) {
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debugInfo = getDebugInfo(context, this, tabSetStr);
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if (debugInfo) {
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output.add(debugInfo);
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output.add(tabSetStr);
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}
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var paths = this.paths, pathCnt = paths.length,
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pathSubCnt;
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sep = context.compress ? ',' : (',\n' + tabSetStr);
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for (i = 0; i < pathCnt; i++) {
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path = paths[i];
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if (!(pathSubCnt = path.length)) { continue; }
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if (i > 0) { output.add(sep); }
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context.firstSelector = true;
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path[0].genCSS(context, output);
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context.firstSelector = false;
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for (j = 1; j < pathSubCnt; j++) {
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path[j].genCSS(context, output);
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}
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}
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output.add((context.compress ? '{' : ' {\n') + tabRuleStr);
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}
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// Compile rules and rulesets
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for (i = 0; i < ruleNodes.length; i++) {
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rule = ruleNodes[i];
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if (i + 1 === ruleNodes.length) {
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context.lastRule = true;
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}
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var currentLastRule = context.lastRule;
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if (isRulesetLikeNode(rule)) {
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context.lastRule = false;
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}
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if (rule.genCSS) {
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rule.genCSS(context, output);
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} else if (rule.value) {
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output.add(rule.value.toString());
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}
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context.lastRule = currentLastRule;
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if (!context.lastRule) {
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output.add(context.compress ? '' : ('\n' + tabRuleStr));
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} else {
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context.lastRule = false;
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}
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}
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if (!this.root) {
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output.add((context.compress ? '}' : '\n' + tabSetStr + '}'));
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context.tabLevel--;
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}
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if (!output.isEmpty() && !context.compress && this.firstRoot) {
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output.add('\n');
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}
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};
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Ruleset.prototype.joinSelectors = function (paths, context, selectors) {
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for (var s = 0; s < selectors.length; s++) {
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this.joinSelector(paths, context, selectors[s]);
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}
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};
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Ruleset.prototype.joinSelector = function (paths, context, selector) {
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function createParenthesis(elementsToPak, originalElement) {
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var replacementParen, j;
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if (elementsToPak.length === 0) {
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replacementParen = new Paren(elementsToPak[0]);
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} else {
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var insideParent = [];
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for (j = 0; j < elementsToPak.length; j++) {
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insideParent.push(new Element(null, elementsToPak[j], originalElement.index, originalElement.currentFileInfo));
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}
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replacementParen = new Paren(new Selector(insideParent));
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}
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return replacementParen;
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}
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function createSelector(containedElement, originalElement) {
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var element, selector;
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element = new Element(null, containedElement, originalElement.index, originalElement.currentFileInfo);
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selector = new Selector([element]);
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return selector;
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}
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// replace all parent selectors inside `inSelector` by content of `context` array
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// resulting selectors are returned inside `paths` array
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// returns true if `inSelector` contained at least one parent selector
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function replaceParentSelector(paths, context, inSelector) {
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// The paths are [[Selector]]
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// The first list is a list of comma separated selectors
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// The inner list is a list of inheritance separated selectors
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// e.g.
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// .a, .b {
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// .c {
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// }
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// }
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// == [[.a] [.c]] [[.b] [.c]]
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//
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var i, j, k, currentElements, newSelectors, selectorsMultiplied, sel, el, hadParentSelector = false, length, lastSelector;
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function findNestedSelector(element) {
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var maybeSelector;
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if (element.value.type !== 'Paren') {
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return null;
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}
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maybeSelector = element.value.value;
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if (maybeSelector.type !== 'Selector') {
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return null;
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}
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return maybeSelector;
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}
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// the elements from the current selector so far
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currentElements = [];
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// the current list of new selectors to add to the path.
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// We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
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// by the parents
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newSelectors = [
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[]
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];
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for (i = 0; i < inSelector.elements.length; i++) {
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el = inSelector.elements[i];
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// non parent reference elements just get added
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if (el.value !== "&") {
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var nestedSelector = findNestedSelector(el);
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if (nestedSelector != null) {
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// merge the current list of non parent selector elements
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// on to the current list of selectors to add
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mergeElementsOnToSelectors(currentElements, newSelectors);
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var nestedPaths = [], replaced, replacedNewSelectors = [];
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replaced = replaceParentSelector(nestedPaths, context, nestedSelector);
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hadParentSelector = hadParentSelector || replaced;
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//the nestedPaths array should have only one member - replaceParentSelector does not multiply selectors
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for (k = 0; k < nestedPaths.length; k++) {
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var replacementSelector = createSelector(createParenthesis(nestedPaths[k], el), el);
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addAllReplacementsIntoPath(newSelectors, [replacementSelector], el, inSelector, replacedNewSelectors);
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}
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newSelectors = replacedNewSelectors;
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|
currentElements = [];
|
|
|
|
} else {
|
|
currentElements.push(el);
|
|
}
|
|
|
|
} else {
|
|
hadParentSelector = true;
|
|
// the new list of selectors to add
|
|
selectorsMultiplied = [];
|
|
|
|
// merge the current list of non parent selector elements
|
|
// on to the current list of selectors to add
|
|
mergeElementsOnToSelectors(currentElements, newSelectors);
|
|
|
|
// loop through our current selectors
|
|
for (j = 0; j < newSelectors.length; j++) {
|
|
sel = newSelectors[j];
|
|
// if we don't have any parent paths, the & might be in a mixin so that it can be used
|
|
// whether there are parents or not
|
|
if (context.length === 0) {
|
|
// the combinator used on el should now be applied to the next element instead so that
|
|
// it is not lost
|
|
if (sel.length > 0) {
|
|
sel[0].elements.push(new Element(el.combinator, '', el.index, el.currentFileInfo));
|
|
}
|
|
selectorsMultiplied.push(sel);
|
|
}
|
|
else {
|
|
// and the parent selectors
|
|
for (k = 0; k < context.length; k++) {
|
|
// We need to put the current selectors
|
|
// then join the last selector's elements on to the parents selectors
|
|
var newSelectorPath = addReplacementIntoPath(sel, context[k], el, inSelector);
|
|
// add that to our new set of selectors
|
|
selectorsMultiplied.push(newSelectorPath);
|
|
}
|
|
}
|
|
}
|
|
|
|
// our new selectors has been multiplied, so reset the state
|
|
newSelectors = selectorsMultiplied;
|
|
currentElements = [];
|
|
}
|
|
}
|
|
|
|
// if we have any elements left over (e.g. .a& .b == .b)
|
|
// add them on to all the current selectors
|
|
mergeElementsOnToSelectors(currentElements, newSelectors);
|
|
|
|
for (i = 0; i < newSelectors.length; i++) {
|
|
length = newSelectors[i].length;
|
|
if (length > 0) {
|
|
paths.push(newSelectors[i]);
|
|
lastSelector = newSelectors[i][length - 1];
|
|
newSelectors[i][length - 1] = lastSelector.createDerived(lastSelector.elements, inSelector.extendList);
|
|
//newSelectors[i][length - 1].copyVisibilityInfo(inSelector.visibilityInfo());
|
|
}
|
|
}
|
|
|
|
return hadParentSelector;
|
|
}
|
|
|
|
// joins selector path from `beginningPath` with selector path in `addPath`
|
|
// `replacedElement` contains element that is being replaced by `addPath`
|
|
// returns concatenated path
|
|
function addReplacementIntoPath(beginningPath, addPath, replacedElement, originalSelector) {
|
|
var newSelectorPath, lastSelector, newJoinedSelector;
|
|
// our new selector path
|
|
newSelectorPath = [];
|
|
|
|
//construct the joined selector - if & is the first thing this will be empty,
|
|
// if not newJoinedSelector will be the last set of elements in the selector
|
|
if (beginningPath.length > 0) {
|
|
newSelectorPath = beginningPath.slice(0);
|
|
lastSelector = newSelectorPath.pop();
|
|
newJoinedSelector = originalSelector.createDerived(lastSelector.elements.slice(0));
|
|
}
|
|
else {
|
|
newJoinedSelector = originalSelector.createDerived([]);
|
|
}
|
|
|
|
if (addPath.length > 0) {
|
|
// /deep/ is a combinator that is valid without anything in front of it
|
|
// so if the & does not have a combinator that is "" or " " then
|
|
// and there is a combinator on the parent, then grab that.
|
|
// this also allows + a { & .b { .a & { ... though not sure why you would want to do that
|
|
var combinator = replacedElement.combinator, parentEl = addPath[0].elements[0];
|
|
if (combinator.emptyOrWhitespace && !parentEl.combinator.emptyOrWhitespace) {
|
|
combinator = parentEl.combinator;
|
|
}
|
|
// join the elements so far with the first part of the parent
|
|
newJoinedSelector.elements.push(new Element(combinator, parentEl.value, replacedElement.index, replacedElement.currentFileInfo));
|
|
newJoinedSelector.elements = newJoinedSelector.elements.concat(addPath[0].elements.slice(1));
|
|
}
|
|
|
|
// now add the joined selector - but only if it is not empty
|
|
if (newJoinedSelector.elements.length !== 0) {
|
|
newSelectorPath.push(newJoinedSelector);
|
|
}
|
|
|
|
//put together the parent selectors after the join (e.g. the rest of the parent)
|
|
if (addPath.length > 1) {
|
|
newSelectorPath = newSelectorPath.concat(addPath.slice(1));
|
|
}
|
|
return newSelectorPath;
|
|
}
|
|
|
|
// joins selector path from `beginningPath` with every selector path in `addPaths` array
|
|
// `replacedElement` contains element that is being replaced by `addPath`
|
|
// returns array with all concatenated paths
|
|
function addAllReplacementsIntoPath( beginningPath, addPaths, replacedElement, originalSelector, result) {
|
|
var j;
|
|
for (j = 0; j < beginningPath.length; j++) {
|
|
var newSelectorPath = addReplacementIntoPath(beginningPath[j], addPaths, replacedElement, originalSelector);
|
|
result.push(newSelectorPath);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function mergeElementsOnToSelectors(elements, selectors) {
|
|
var i, sel;
|
|
|
|
if (elements.length === 0) {
|
|
return ;
|
|
}
|
|
if (selectors.length === 0) {
|
|
selectors.push([ new Selector(elements) ]);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < selectors.length; i++) {
|
|
sel = selectors[i];
|
|
|
|
// if the previous thing in sel is a parent this needs to join on to it
|
|
if (sel.length > 0) {
|
|
sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
|
|
}
|
|
else {
|
|
sel.push(new Selector(elements));
|
|
}
|
|
}
|
|
}
|
|
|
|
function deriveSelector(visibilityInfo, deriveFrom) {
|
|
var newSelector = deriveFrom.createDerived(deriveFrom.elements, deriveFrom.extendList, deriveFrom.evaldCondition);
|
|
newSelector.copyVisibilityInfo(visibilityInfo);
|
|
return newSelector;
|
|
}
|
|
|
|
// joinSelector code follows
|
|
var i, newPaths, hadParentSelector;
|
|
|
|
newPaths = [];
|
|
hadParentSelector = replaceParentSelector(newPaths, context, selector);
|
|
|
|
if (!hadParentSelector) {
|
|
if (context.length > 0) {
|
|
newPaths = [];
|
|
for (i = 0; i < context.length; i++) {
|
|
//var concatenated = [];
|
|
//context[i].forEach(function(entry) {
|
|
// var newEntry = entry.createDerived(entry.elements, entry.extendList, entry.evaldCondition);
|
|
// newEntry.copyVisibilityInfo(selector.visibilityInfo());
|
|
// concatenated.push(newEntry);
|
|
//}, this);
|
|
var concatenated = context[i].map(deriveSelector.bind(this, selector.visibilityInfo()));
|
|
|
|
concatenated.push(selector);
|
|
newPaths.push(concatenated);
|
|
}
|
|
}
|
|
else {
|
|
newPaths = [[selector]];
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < newPaths.length; i++) {
|
|
paths.push(newPaths[i]);
|
|
}
|
|
|
|
};
|
|
module.exports = Ruleset;
|