81 lines
2.4 KiB
JavaScript
81 lines
2.4 KiB
JavaScript
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var Parser = require('stylus/lib/parser');
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var Visitor = require('stylus/lib/visitor');
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var nodes = require('stylus/lib/nodes');
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module.exports = listImports;
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// ImportVisitor is a simple stylus ast visitor that navigates the graph
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// building a list of imports in it.
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function ImportVisitor() {
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Visitor.apply(this, arguments);
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this.importPaths = [];
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}
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ImportVisitor.prototype = Object.create(Visitor.prototype);
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ImportVisitor.prototype.constructor = ImportVisitor;
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ImportVisitor.prototype.visitImport = function(node) {
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this.importPaths.push(node.path.first.string);
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return node;
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};
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ImportVisitor.prototype.visitRoot = function(block){
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for (var i = 0; i < block.nodes.length; ++i) {
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this.visit(block.nodes[i]);
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}
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return block;
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};
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ImportVisitor.prototype.visitExpression = function(expr) {
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for (var i = 0; i < expr.nodes.length; ++i) {
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this.visit(expr.nodes[i]);
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}
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return expr;
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};
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ImportVisitor.prototype.visitCall = function(fn) {
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if (fn.name === 'use' || fn.name === 'json') {
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this.importPaths.push(fn.args.first.string);
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}
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return fn;
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};
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ImportVisitor.prototype.visitSelector = function(sel) {
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for (var i = 0; i < sel.block.nodes.length; i++) {
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this.visit(sel.block.nodes[i]);
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}
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return sel;
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}
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ImportVisitor.prototype.visitBlock = ImportVisitor.prototype.visitRoot;
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ImportVisitor.prototype.visitGroup = ImportVisitor.prototype.visitRoot;
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// Returns a list of paths that given source imports.
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function listImports(source, options) {
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// Store source -> imports work in a cache. The Parser is the most expensive
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// part of stylus and we can't use their cache without creating undesired side
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// effects later during the actual render. In single run builds this will
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// benefit repeated files imported like common styling. In multiple run builds
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// this will help stylus import trees when a dependency changes, the higher up
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// files won't need to be parsed again.
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var cache = options.cache;
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if (cache && cache[source]) { return cache[source]; }
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// Current idea here is to silence errors and let them rise in stylus's
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// renderer which has more handling so that the error message is more
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// meaningful and easy to understand.
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try {
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var ast = new Parser(source, { cache: false }).parse();
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} catch (e) {
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return [];
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}
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var importVisitor = new ImportVisitor(ast, {});
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importVisitor.visit(ast);
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if (cache) {
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cache[source] = importVisitor.importPaths;
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}
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return importVisitor.importPaths;
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}
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