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subscript

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Fast and tiny expression evaluator with minimal syntax.

github.com/dy/subscript

dy/subscript

12 lines (7 loc) • 611 B
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import { PREC_OR, PREC_AND, PREC_SHIFT, PREC_XOR, PREC_PREFIX } from "../src/const.js" import { unary, binary } from "../src/parse.js" import { operator, compile } from "../src/compile.js" unary('~', PREC_PREFIX), operator('~', (a, b) => !b && (a = compile(a), ctx => ~a(ctx))) binary('|', PREC_OR), operator('|', (a, b) => b && (a = compile(a), b = compile(b), ctx => a(ctx) | b(ctx))) binary('&', PREC_AND), operator('&', (a, b) => b && (a = compile(a), b = compile(b), ctx => a(ctx) & b(ctx))) binary('^', PREC_XOR), operator('^', (a, b) => b && (a = compile(a), b = compile(b), ctx => a(ctx) ^ b(ctx)))