@qrvey/formula-lang v2.0.0

Qrvey Formula Language

Usage

Transpile function

import { ENGINES, Transpile } from "@qrvey/formula-lang";

const program = "MID(MID(\"This is a test\", 1, 5), 1, 2)"
const transpiled = Transpile(program, ENGINES.ELASTICSEARCH)
console.log(transpiled)

the output will be

'This is a test'.substring(1, 5).substring(1, 2)

TranspileAST function

import { ENGINES, TranspileAST } from "@qrvey/formula-lang";

const ast = {
    "type": "Program",
    "exp": "1 + 2",
    "lang": "QrveyLang",
    "version": "0.0.0",
    "body": {
        "operator": "+",
        "type": "BinaryExpression",
        "left": {
            "type": "Literal",
            "dataType": "number",
            "value": 1
        },
        "right": {
            "type": "Literal",
            "dataType": "number",
            "value": 2
        }
    }
}
const transpiled = TranspileAST(ast, ENGINES.ELASTICSEARCH)
console.log(transpiled)

the output will be

(1 + 2)

codemirror editor

import { EditorState } from "@codemirror/state";
import { basicSetup } from "codemirror";
import { FormulaHighlight, calculateAST } from "@qrvey/formula-lang"

// set the editor state with the QFormula plugin. This adds the support for 
this._state = EditorState.create({
    doc: 'Test formula',
    extensions: [
    basicSetup,
    FormulaHighlight(),
    ...
    ]
})

// On every edit update you can calculate the AST
private dispatchTextUpdate(state: EditorState) {
    const tree = (state as any).tree;
    const text = ((state.doc as any).text as Array<string>).join('\n');
    const ast = calculateAST(text, tree.topNode);
    // dispatch event after return
    return { text, ast }
}