react-native-drawing/lib/dist/shared/utils/SymbolParser/index.js

A React Native library that provides a canvas to perform drawing actions

import { DoubleMap } from './DoubleMap';
import { IdAllocator } from './IdAllocator';
/**
 * An object to "transform" symbols to numeric ids
*/
export class SymbolParser {
    constructor() {
        Object.defineProperty(this, "index", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: new DoubleMap()
        });
        Object.defineProperty(this, "idAllocator", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: new IdAllocator((id) => {
                return this.index.get(id) === undefined;
            })
        });
    }
    /**
     * Gets a numeric id to represent the symbol (the id is created if it doesn't exist)
    */
    toId(sym) {
        let id = this.index.get(sym);
        if (id === undefined) {
            id = this.idAllocator.getFree();
            this.index.set(sym, id);
        }
        return id;
    }
    /**
     * Gets a symbol that represents the provided id
    */
    toSymbol(id) {
        let sym = this.index.get(id);
        if (sym === undefined) {
            sym = Symbol();
            this.index.set(sym, id);
        }
        return sym;
    }
    /**
     * Delete the references between the symbol and its id
    */
    unRef(sym) {
        this.index.delete(sym);
    }
}