65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
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'use strict';
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const Walker = require('node-source-walk');
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const gonzales = require('gonzales-pe');
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const debug = require('debug')('detective-less');
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/**
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* Extract the @import statements from a given less file's content
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*
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* @param {String} fileContent
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* @return {String[]}
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*/
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module.exports = function detective(fileContent) {
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if (typeof fileContent === 'undefined') { throw new Error('content not given'); }
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if (typeof fileContent !== 'string') { throw new Error('content is not a string'); }
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let dependencies = [];
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let ast;
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try {
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debug('content: ' + fileContent);
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ast = gonzales.parse(fileContent, { syntax: 'less' });
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} catch (e) {
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debug('parse error: ', e.message);
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ast = {};
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}
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detective.ast = ast;
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const walker = new Walker();
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walker.walk(ast, function(node) {
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if (!isImportStatement(node)) { return; }
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dependencies = dependencies.concat(extractDependencies(node));
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});
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return dependencies;
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};
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function isImportStatement(node) {
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if (!node || node.type !== 'atrule') { return false; }
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if (!node.content.length || node.content[0].type !== 'atkeyword') { return false; }
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const atKeyword = node.content[0];
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if (!atKeyword.content.length) { return false; }
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const importKeyword = atKeyword.content[0];
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if (importKeyword.type !== 'ident' || importKeyword.content !== 'import') { return false; }
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return true;
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}
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function extractDependencies(importStatementNode) {
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return importStatementNode.content
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.filter(function(innerNode) {
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return innerNode.type === 'string' || innerNode.type === 'ident';
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})
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.map(function(identifierNode) {
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return identifierNode.content.replace(/["']/g, '');
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});
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}
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