[parse] using a parser with a dynamic data structure #502

bit-app-3000 · 2025-07-03T12:38:59Z

bit-app-3000
Jul 3, 2025

Hello
I am trying to figure out
a powerful parser via defGrammar

I am having trouble understanding the syntax description and signature

Can someone please show me how to
parse strings with dynamic structure

I am having trouble understanding whether this is even possible?

The challenge is to decompose these strings into a array of vehicles structure

import { defContext, defGrammar } from '@thi.ng/parse'
import { comp, filter, map, run, sideEffect, trace } from '@thi.ng/transducers'

const input = [
  'DODGE D-SERIES 2D PICKUP /RAMCHARGER 3D SUV 1980-93 (With M/B)',
  'CHEV PICKUP 2D EXTENDED 1993-99 (03 Hole-Encapsulated)',
  'FORD ESCORT 5D WAGON 1997-99 (USA)',
  'MERCURY VILLAGER/NISSAN QUEST MPV 1999-02 (NO Hole)',
  'CHRYSLER SEBRING 2D COUPE 1995-00 /DODGE AVENGER'
]

const brands = ['DODGE', 'MERCURY', 'CHRYSLER', 'NISSAN']
const models = ['ESCORT', 'VILLAGER', 'SEBRING', 'QUEST', 'AVENGER', 'RAMCHARGER']
const bodies = ['PICKUP', 'WAGON', 'COUPE', 'SUV']
const doors = ['2D', '3D', '4D', '5D']


let rxRoundBrackets = /(?<=\()((.*?))(?=\))/g

const rules = `

brand: match.from(brands) ;
model: match.from(models) ;
body:  match.from(bodies) ;
doors: match.from(doors)  ;
years: handler.data_range ;
trait: match(rxRoundBrackets) ;

vehicle: <brand> <model> <body> <doors> <years> => collect ;
vehicle_list: <vehicle>+ => collect ;
main: <vehicle_list>+ => collect ;

`
const lang = defGrammar(rules, {}, { debug: false })

const res = x => lang.rules.main(x)

let tx = comp(
  map(x => defContext(x, { debug: false })),
  sideEffect(res),
  filter(Boolean),
  map(x => x),
  trace()
)

run(tx, input)

would be happy with any breed.

postspectacular · 2025-07-09T15:52:37Z

postspectacular
Jul 9, 2025
Maintainer

Hi @bit-app-3000 — will get back to you on that asap.

0 replies

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[parse] using a parser with a dynamic data structure #502

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bit-app-3000 Jul 3, 2025

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Uh oh!

postspectacular Jul 9, 2025 Maintainer

bit-app-3000
Jul 3, 2025

postspectacular
Jul 9, 2025
Maintainer