promptly-ai/dist/utils/handlebars.js

A universal template-based prompt management system for LLM applications

"use strict";
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var __importStar = (this && this.__importStar) || (function () {
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Object.defineProperty(exports, "__esModule", { value: true });
exports.registerHandlebarsHelpers = registerHandlebarsHelpers;
exports.evaluateCondition = evaluateCondition;
const Handlebars = __importStar(require("handlebars"));
/**
 * Register custom Handlebars helpers for template rendering
 */
function registerHandlebarsHelpers() {
    // Comparison helpers
    Handlebars.registerHelper('eq', (a, b) => a === b);
    Handlebars.registerHelper('ne', (a, b) => a !== b);
    Handlebars.registerHelper('gt', (a, b) => a > b);
    Handlebars.registerHelper('gte', (a, b) => a >= b);
    Handlebars.registerHelper('lt', (a, b) => a < b);
    Handlebars.registerHelper('lte', (a, b) => a <= b);
    // Logical helpers
    Handlebars.registerHelper('and', (a, b) => a && b);
    Handlebars.registerHelper('or', (a, b) => a || b);
    Handlebars.registerHelper('not', (a) => !a);
    // String helpers
    Handlebars.registerHelper('uppercase', (str) => str?.toUpperCase());
    Handlebars.registerHelper('lowercase', (str) => str?.toLowerCase());
    Handlebars.registerHelper('capitalize', (str) => str ? str.charAt(0).toUpperCase() + str.slice(1).toLowerCase() : '');
    // Array helpers
    Handlebars.registerHelper('length', (arr) => arr?.length || 0);
    Handlebars.registerHelper('join', (arr, separator = ', ') => arr?.join(separator) || '');
    // Type checking helpers
    Handlebars.registerHelper('isString', (value) => typeof value === 'string');
    Handlebars.registerHelper('isNumber', (value) => typeof value === 'number');
    Handlebars.registerHelper('isBoolean', (value) => typeof value === 'boolean');
    Handlebars.registerHelper('isArray', (value) => Array.isArray(value));
    Handlebars.registerHelper('isObject', (value) => typeof value === 'object' && value !== null && !Array.isArray(value));
    // Math helpers
    Handlebars.registerHelper('add', (a, b) => a + b);
    Handlebars.registerHelper('subtract', (a, b) => a - b);
    Handlebars.registerHelper('multiply', (a, b) => a * b);
    Handlebars.registerHelper('divide', (a, b) => a / b);
    // Utility helpers
    Handlebars.registerHelper('default', (value, defaultValue) => value !== undefined && value !== null ? value : defaultValue);
}
/**
 * Evaluate a condition string using Handlebars
 */
function evaluateCondition(condition, context) {
    try {
        const template = Handlebars.compile(`{{#if ${condition}}}true{{/if}}`);
        const result = template(context).trim();
        return result === 'true';
    }
    catch (error) {
        console.warn(`Failed to evaluate condition "${condition}":`, error);
        return false;
    }
}
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