Created
June 15, 2016 13:33
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Jexl custom evaluator shim
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| import {elements as defaultGrammar} from 'jexl/lib/grammar.js'; | |
| import defaultParser from 'jexl/lib/parser/Parser.js'; | |
| import defaultEvaluator from 'jexl/lib/evaluator/Evaluator.js'; | |
| import defaultLexer from 'jexl/lib/Lexer.js'; | |
| export function customEval( | |
| expr, | |
| context={}, | |
| { | |
| transforms={}, | |
| grammar=defaultGrammar, | |
| parser=defaultParser, | |
| evaluator=defaultEvaluator, | |
| lexer=defaultLexer, | |
| }={} | |
| ) { | |
| const parserInst = new parser(grammar); | |
| const evaluatorInst = new evaluator(grammar, transforms, context); | |
| const lexerInst = new lexer(grammar); | |
| const tokens = lexerInst.tokenize(expr); | |
| parserInst.addTokens(tokens); | |
| const ast = parserInst.complete(); | |
| console.log('ast =', JSON.stringify(ast, null, 2)); | |
| return evaluatorInst.eval(ast); | |
| }; |
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