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117 lines
3.4 KiB
117 lines
3.4 KiB
/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* Template class implements token replacement logic for strings containing HTML and tokens.
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*
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* The following format is used for tokens: #{token_name}.
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* When found in template String, token will be replaced with value of the key "token_name" of object passed to
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* evaluate function. All occurrences of tokens are replaced by values from object with HTML entities escaped.
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* Token name should be prefixed with character '*' to avoid escaping of HTML entities (for example, #{*test}).
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* Backslash character (\\) can be used to escape token (such tokens will not be affected).
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*
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* Nested object properties could be used in templated by using square bracket token syntax (for example, #{a[b][c]}).
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* Previous example will look for nested value a->b->c ({'a': {'b': {'c': 'value'}}}).
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*
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* @param {string} template template string
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*
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* @return {Template}
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*/
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var Template = function(template) {
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this.template = template;
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};
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Template.prototype = {
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/**
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* Helper function called when match is found in template.
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*
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* @param {array} match result of regex matching
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* @param {object} object object containing data
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*
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* @return {string}
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*/
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onMatch: function (match, object) {
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if (object == null) {
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return match[1] + '';
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}
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var before = match[1] || '';
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if (before == '\\') {
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return match[2];
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}
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var ctx = object,
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expr = match[3],
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escape = (expr.substring(0, 1) !== '*');
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if(!escape) {
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expr = expr.substring(1);
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}
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var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
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match = pattern.exec(expr);
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if (match == null) {
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return before;
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}
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while (match != null) {
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var comp = match[1].substring(0, 1) === '[' ? match[2].replace(/\\\\]/g, ']') : match[1];
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ctx = ctx[comp];
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if (null == ctx || '' == match[3]) {
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break;
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}
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expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
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match = pattern.exec(expr);
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}
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ctx = '' + (((typeof ctx === 'undefined') || (ctx === null)) ? '' : ctx);
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return before + (escape ? ctx.replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>')
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.replace(/\"/g,'"').replace(/\'/g,''') : ctx);
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},
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/**
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* Fill template with data defined in object.
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*
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* @param {object} object object containing data
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*
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* @return {string}
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*/
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evaluate: function(object) {
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var result = '',
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source = this.template;
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while (source.length > 0) {
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var match = source.match(/(^|.|\r|\n)(#\{(.*?)\})/);
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if (match) {
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result += source.substring(0, match.index);
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result += this.onMatch(match, object);
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source = source.substring(match.index + match[0].length);
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}
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else {
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result += source;
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break;
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}
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}
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return result;
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}
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};
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