ts-flex-query/expressions/let.js

Flexible and type-safe data queries

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.LetExpression = void 0;
exports.letIn = letIn;
const evaluate_expression_1 = require("../helpers/evaluate-expression");
const evaluation_context_utils_1 = require("../helpers/evaluation-context-utils");
const variable_1 = require("./variable");
class LetExpression {
    get dataType() {
        return this.body.dataType;
    }
    constructor(input, variableSymbol, body) {
        this.input = input;
        this.variableSymbol = variableSymbol;
        this.body = body;
    }
    evaluate(context) {
        const inputValue = (0, evaluate_expression_1.evaluateExpression)(this.input, context);
        const result = (0, evaluate_expression_1.evaluateExpression)(this.body, (0, evaluation_context_utils_1.addVariable)(context, this.variableSymbol, inputValue));
        return result;
    }
}
exports.LetExpression = LetExpression;
function letIn(value, body) {
    if (value instanceof variable_1.VariableExpression) {
        // The LetExpression is not required if the value already is a variable.
        return body(value);
    }
    const variableSymbol = Symbol('vLet');
    const variable = new variable_1.VariableExpression(value.dataType, variableSymbol);
    return new LetExpression(value, variableSymbol, body(variable));
}
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