working on parsers

backend/src/app.ts

@@ -2,7 +2,7 @@ import express from 'express'
 import { json } from 'body-parser'
 import { Sequelize } from 'sequelize'
 import { database, Character, Game, Pick, App } from './db'
-import { lexr, orderByLexr, parseOrderByString } from './tokenizer'
+import { lexr, parseOrderByString, FilterParser } from './tokenizer'
 
 const app = express()
 const jsonParser = json()
@@ -50,6 +50,15 @@ app.post('/api/game', jsonParser, async (req, res) => {
   })
   const pageCount = Math.ceil((await Character.count()) / count)
 
+  let fp = new FilterParser()
+
+  fp.lexer
+    .input(filter)
+    .tokens()
+    .forEach((t) => {
+      console.log(t)
+    })
+
   res.setHeader('Content-Type', 'application/json')
   res.send({ gameData, pageCount })
 })

backend/src/tokenizer.ts

@@ -1,4 +1,5 @@
 import Tokenizr from 'tokenizr'
+import ASTY from 'asty'
 
 export const lexr = new Tokenizr()
 
@@ -47,3 +48,49 @@ export function parseOrderByString(orderBy: string) {
   }
   return output
 }
+
+const openGroupRegex = /\(/
+const closeGroupRegex = /\)/
+const conjunctinoRegex = /AND|OR/
+const statementRegex = /([a-zA-Z]+)\s?(=|!=|<|>|<=|>=|:)\s?([a-zA-Z\d"']+)/
+const spacerRegex = /\s/
+
+export class FilterParser {
+
+  lexer: Tokenizr = this.createLexer()
+
+  constructor() {}
+
+  private createLexer(): Tokenizr {
+    const tkz = new Tokenizr()
+
+    tkz.rule(openGroupRegex, (ctx, m) => {
+      ctx.accept('opengroup')
+    })
+
+    tkz.rule(closeGroupRegex, (ctx, m) => {
+      ctx.accept('closegroup')
+    })
+
+    tkz.rule(conjunctinoRegex, (ctx, m) => {
+      ctx.accept('conjunction', m[0])
+    })
+
+    tkz.rule(statementRegex, (ctx, m) => {
+      ctx.accept('column', m[1])
+      ctx.accept('opperator', m[2])
+      ctx.accept('value', m[3])
+    })
+
+    tkz.rule(spacerRegex, (ctx, m)=> {
+      ctx.ignore();
+    })
+
+    return tkz
+  }
+
+  buildAST(): ASTY {
+    const ast = new ASTY()
+  }
+
+}