56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
"use strict";
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const VOID_0 = t => t.unaryExpression("void", t.numericLiteral(0), true);
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const evaluate = require("babel-helper-evaluate-path"); // Types as Symbols - for comparing types
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const types = {}; // This is a test key which is used to avoid Object.keys check
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// Object.keys() check is really expensive
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// https://gist.github.com/vigneshshanmugam/c766550ecd02292dcdfbf0bf013b9d3d
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const testKey = "Expression";
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const typeSymbols = t => {
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// don't recompute
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if (types[testKey] !== undefined) {
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return types;
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}
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t.TYPES.forEach(type => {
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types[type] = Symbol.for(type);
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});
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return types;
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};
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const isNodeOfType = (t, node, typeSymbol) => typeof typeSymbol !== "symbol" ? false : t["is" + Symbol.keyFor(typeSymbol)](node);
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const isPatternMatchesPath = t => function _isPatternMatchesPath(patternValue, inputPath) {
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if (Array.isArray(patternValue)) {
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for (let i = 0; i < patternValue.length; i++) {
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if (_isPatternMatchesPath(patternValue[i], inputPath)) {
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return true;
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}
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}
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return false;
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}
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if (typeof patternValue === "function") {
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return patternValue(inputPath);
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}
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if (isNodeOfType(t, inputPath.node, patternValue)) return true;
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const evalResult = evaluate(inputPath);
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if (!evalResult.confident || !inputPath.isPure()) return false;
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return evalResult.value === patternValue;
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};
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module.exports = {
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VOID_0,
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// Types as Symbols
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typeSymbols,
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// This is required for resolving type aliases
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isNodeOfType,
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isPatternMatchesPath
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}; |