67 lines
1.6 KiB
JavaScript
67 lines
1.6 KiB
JavaScript
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export function getTrace(node) {
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function shouldPutToTrace(syntax) {
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if (syntax === null) {
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return false;
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}
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return (
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syntax.type === 'Type' ||
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syntax.type === 'Property' ||
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syntax.type === 'Keyword'
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);
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}
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function hasMatch(matchNode) {
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if (Array.isArray(matchNode.match)) {
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// use for-loop for better perfomance
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for (let i = 0; i < matchNode.match.length; i++) {
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if (hasMatch(matchNode.match[i])) {
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if (shouldPutToTrace(matchNode.syntax)) {
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result.unshift(matchNode.syntax);
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}
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return true;
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}
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}
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} else if (matchNode.node === node) {
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result = shouldPutToTrace(matchNode.syntax)
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? [matchNode.syntax]
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: [];
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return true;
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}
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return false;
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}
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let result = null;
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if (this.matched !== null) {
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hasMatch(this.matched);
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}
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return result;
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}
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export function isType(node, type) {
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return testNode(this, node, match => match.type === 'Type' && match.name === type);
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}
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export function isProperty(node, property) {
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return testNode(this, node, match => match.type === 'Property' && match.name === property);
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}
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export function isKeyword(node) {
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return testNode(this, node, match => match.type === 'Keyword');
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}
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function testNode(match, node, fn) {
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const trace = getTrace.call(match, node);
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if (trace === null) {
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return false;
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}
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return trace.some(fn);
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}
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