subscript/feature/access.js

Fast and tiny expression evaluator with minimal syntax.

import { access, binary, group } from '../src/parse.js'
import { operator, compile } from '../src/compile.js'
import { CBRACK, PREC_ACCESS } from '../src/const.js'

// a[b]
access('[]', PREC_ACCESS)
operator('[]', (a, b) => !b ? err() : (a = compile(a), b = compile(b), ctx => a(ctx)[b(ctx)]))

// a.b
binary('.', PREC_ACCESS)
operator('.', (a, b) => (a = compile(a), b = !b[0] ? b[1] : b, ctx => a(ctx)[b])) // a.true, a.1 → needs to work fine