@tokens-studio/graph-engine/dist/nodes/math/eval.js

An execution engine to handle Token Studios generators and resolvers

import { Node } from '../../programmatic/node.js';
import { NumberSchema, StringSchema } from '../../schemas/index.js';
import { Parser } from 'expr-eval';
import { annotatedDynamicInputs } from '../../annotations/index.js';
export default class NodeDefinition extends Node {
    static title = 'Evaluate math';
    static type = 'studio.tokens.math.eval';
    static description = 'Allows you to evaluate arbitrary math expressions';
    constructor(props) {
        super(props);
        this.annotations[annotatedDynamicInputs] = true;
        this.addInput('expression', {
            type: StringSchema
        });
        //We expect users to expose the variables they want to use in the expression as inputs
        this.addOutput('value', {
            type: NumberSchema
        });
        this.addOutput('expression', {
            type: StringSchema
        });
    }
    execute() {
        const { expression, ...inputs } = this.getAllInputs();
        const parser = new Parser();
        const output = parser.evaluate(expression, inputs);
        this.outputs.expression.set(expression);
        this.outputs.value.set(output);
    }
}
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