94958e084e
See https://github.com/google/traceur- compiler/commit/6732e5eddf203ae02bcfb8faea837590bf32c061
26 lines
670 B
JavaScript
26 lines
670 B
JavaScript
import {INSTANCEOF} from 'traceur/src/syntax/TokenType';
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import {ParseTreeTransformer} from './ParseTreeTransformer';
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import {
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createBinaryExpression,
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createOperatorToken
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} from 'traceur/src/codegeneration/ParseTreeFactory';
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/**
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* Transforms `a instanceof b` to `a is b`,
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*/
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export class InstanceOfTransformer extends ParseTreeTransformer {
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/**
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* @param {BinaryExpression} tree
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* @return {ParseTree}
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*/
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transformBinaryExpression(tree) {
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tree = super.transformBinaryExpression(tree);
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if (tree.operator.type === INSTANCEOF) {
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return createBinaryExpression(tree.left, createOperatorToken('is'), tree.right);
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}
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return tree;
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}
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}
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