@cloudpss/template/dist/parser.js

Lightweight string and object templating utilities with interpolation and formula support.

import { compileSync } from '@mirascript/mirascript';
import { LRUCache } from 'lru-cache';
const CACHE_SIZE = 100;
const formula = new LRUCache({
    max: CACHE_SIZE,
    memoMethod: (template) => {
        const formula = template.slice(1);
        const value = compileSync(formula, { input_mode: 'Script' });
        return {
            type: 'formula',
            value: value,
        };
    },
});
const interpolation = new LRUCache({
    max: CACHE_SIZE,
    memoMethod: (template) => {
        const expr = template.slice(1);
        const value = compileSync(expr, { input_mode: 'Template' });
        return {
            type: 'interpolation',
            value: value,
        };
    },
});
/**
 * 解析字符串模板
 * - 长度大于 1
 *   - 如果模板以 `=` 开头，则表示是一个公式
 *   - 如果模板以 `$` 开头，则表示是一个插值模板
 * - 否则表示是一个普通字符串
 */
export function parseTemplate(template) {
    if (template.length <= 1)
        return template;
    if (template.startsWith('=')) {
        return formula.memo(template);
    }
    if (template.startsWith('$')) {
        return interpolation.memo(template);
    }
    return template;
}
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