mirror of https://gitlab.com/octtspacc/staticoso
113 lines
2.9 KiB
JavaScript
113 lines
2.9 KiB
JavaScript
'use strict';
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module.exports = walkAST;
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function walkAST(ast, before, after, options) {
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if (after && typeof after === 'object' && typeof options === 'undefined') {
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options = after;
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after = null;
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}
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options = options || {includeDependencies: false};
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var parents = options.parents = options.parents || [];
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var replace = function replace(replacement) {
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if (Array.isArray(replacement) && !replace.arrayAllowed) {
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throw new Error('replace() can only be called with an array if the last parent is a Block or NamedBlock');
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}
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ast = replacement;
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};
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replace.arrayAllowed = parents[0] && (
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/^(Named)?Block$/.test(parents[0].type) ||
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parents[0].type === 'RawInclude' && ast.type === 'IncludeFilter');
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if (before) {
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var result = before(ast, replace);
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if (result === false) {
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return ast;
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} else if (Array.isArray(ast)) {
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// return right here to skip after() call on array
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return walkAndMergeNodes(ast);
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}
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}
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parents.unshift(ast);
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switch (ast.type) {
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case 'NamedBlock':
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case 'Block':
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ast.nodes = walkAndMergeNodes(ast.nodes);
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break;
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case 'Case':
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case 'Filter':
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case 'Mixin':
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case 'Tag':
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case 'InterpolatedTag':
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case 'When':
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case 'Code':
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case 'While':
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if (ast.block) {
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ast.block = walkAST(ast.block, before, after, options);
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}
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break;
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case 'Each':
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if (ast.block) {
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ast.block = walkAST(ast.block, before, after, options);
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}
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if (ast.alternate) {
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ast.alternate = walkAST(ast.alternate, before, after, options);
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}
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break;
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case 'Conditional':
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if (ast.consequent) {
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ast.consequent = walkAST(ast.consequent, before, after, options);
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}
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if (ast.alternate) {
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ast.alternate = walkAST(ast.alternate, before, after, options);
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}
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break;
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case 'Include':
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walkAST(ast.block, before, after, options);
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walkAST(ast.file, before, after, options);
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break;
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case 'Extends':
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walkAST(ast.file, before, after, options);
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break;
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case 'RawInclude':
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ast.filters = walkAndMergeNodes(ast.filters);
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walkAST(ast.file, before, after, options);
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break;
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case 'Attrs':
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case 'BlockComment':
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case 'Comment':
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case 'Doctype':
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case 'IncludeFilter':
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case 'MixinBlock':
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case 'YieldBlock':
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case 'Text':
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break;
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case 'FileReference':
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if (options.includeDependencies && ast.ast) {
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walkAST(ast.ast, before, after, options);
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}
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break;
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default:
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throw new Error('Unexpected node type ' + ast.type);
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break;
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}
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parents.shift();
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after && after(ast, replace);
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return ast;
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function walkAndMergeNodes(nodes) {
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return nodes.reduce(function (nodes, node) {
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var result = walkAST(node, before, after, options);
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if (Array.isArray(result)) {
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return nodes.concat(result);
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} else {
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return nodes.concat([result]);
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}
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}, []);
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}
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}
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