art-template/lib/compile/runtime.js

JavaScript Template Engine

'use strict';

/*! art-template@runtime | https://github.com/goofychris/art-template */

var globalThis = typeof self !== 'undefined' ? self : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : {};

var runtime = Object.create(globalThis);
var ESCAPE_REG = /["&'<>]/;

/**
 * 编码模板输出的内容
 * @param  {any}        content
 * @return {string}
 */
runtime.$escape = function (content) {
    return xmlEscape(toString(content));
};

/**
 * 迭代器，支持数组与对象
 * @param {array|Object} data
 * @param {function}     callback
 */
runtime.$each = function (data, callback) {
    if (Array.isArray(data)) {
        for (var i = 0, len = data.length; i < len; i++) {
            callback(data[i], i);
        }
    } else {
        for (var _i in data) {
            callback(data[_i], _i);
        }
    }
};

// 将目标转成字符
function toString(value) {
    if (typeof value !== 'string') {
        if (value === undefined || value === null) {
            value = '';
        } else if (typeof value === 'function') {
            value = toString(value.call(value));
        } else {
            value = JSON.stringify(value);
        }
    }

    return value;
}

// 编码 HTML 内容
function xmlEscape(content) {
    var html = '' + content;
    var regexResult = ESCAPE_REG.exec(html);
    if (!regexResult) {
        return content;
    }

    var result = '';
    var i = void 0,
        lastIndex = void 0,
        char = void 0;
    for (i = regexResult.index, lastIndex = 0; i < html.length; i++) {
        switch (html.charCodeAt(i)) {
            case 34:
                char = '&#34;';
                break;
            case 38:
                char = '&#38;';
                break;
            case 39:
                char = '&#39;';
                break;
            case 60:
                char = '&#60;';
                break;
            case 62:
                char = '&#62;';
                break;
            default:
                continue;
        }

        if (lastIndex !== i) {
            result += html.substring(lastIndex, i);
        }

        lastIndex = i + 1;
        result += char;
    }

    if (lastIndex !== i) {
        return result + html.substring(lastIndex, i);
    } else {
        return result;
    }
}

module.exports = runtime;