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annotate src/implab/text/template-compile.js @ 26:fb23f3c854df

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added new format for tamplates
author nickolay
date Sun, 10 Dec 2017 14:10:21 +0300
parents f750c89976d3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 define(
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2 ["dojo/request", "./format", "../log/trace!"],
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3 function (request, format, trace) {
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4
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5 // разбивает строку шаблона на токены, возвращает контекст для
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6 // дальнейшей обработки в visitTemplate
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7 var parseTemplate = function (str) {
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8 var tokens = str.split(/(<%=|\[%=|<%|\[%|%\]|%>)/);
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9 var pos = -1;
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10 var data = [],
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11 code = [];
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12
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13 return {
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14 next: function () {
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15 pos++;
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16 return pos < tokens.length;
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17 },
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18 token: function () {
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19 return tokens[pos];
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20 },
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21 pushData: function () {
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22 var i = data.length;
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23 data.push.apply(data, arguments);
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24 return i;
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25 },
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26 pushCode : function() {
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27 var i = code.length;
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28 code.push.apply(code, arguments);
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29 return i;
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30 },
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31 compile: function () {
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32 var text = "var $p = [];\n" +
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33 "var print = function(){\n" +
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34 " $p.push(format.apply(null,arguments));\n" +
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35 "};\n" +
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36 // Introduce the data as local variables using with(){}
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37 "with(obj){\n" +
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38 code.join("\n") +
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39 "}\n" +
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40 "return $p.join('');";
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41
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42 try {
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43 var compiled = new Function("obj, format, $data", text);
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44 /**
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45 * Функция форматирования по шаблону
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46 *
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47 * @type{Function}
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48 * @param{Object} obj объект с параметрами для подстановки
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49 */
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50 return function (obj) {
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51 return compiled(obj || {}, format, data);
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52 };
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53 } catch (e) {
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54 trace.error([e]);
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55 trace.log([text, data]);
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56 throw e;
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57 }
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58 }
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59 }
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60 };
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61
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62 function visitTemplate(context) {
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63 while (context.next()) {
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64 switch (context.token()) {
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65 case "<%":
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66 case "[%":
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67 visitCode(context);
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68 break;
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69 case "<%=":
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70 case "[%=":
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71 visitInline(context);
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72 break;
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73 default:
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74 visitTextFragment(context);
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75 break;
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76 }
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77 }
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78 }
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79
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80 function visitInline(context) {
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81 var code = ["$p.push("];
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82 while (context.next()) {
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83 if (context.token() == "%>" || context.token() == "%]")
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84 break;
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85 code.push(context.token());
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86 }
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87 code.push(");");
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88 context.pushCode(code.join(''));
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89 }
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91 function visitCode(context) {
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92 var code = [];
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93 while (context.next()) {
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94 if (context.token() == "%>" || context.token() == "%]")
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95 break;
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96 code.push(context.token());
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97 }
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98 context.pushCode(code.join(''));
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99 }
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100
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101 function visitTextFragment(context) {
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102 var i = context.pushData(context.token());
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103 context.pushCode("$p.push($data["+i+"]);");
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104 }
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105
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106 var compile = function (str) {
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107 if (!str)
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108 return function() { return "";};
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109
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110 var ctx = parseTemplate(str);
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111 visitTemplate(ctx);
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112 return ctx.compile();
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113 };
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114
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115 var cache = {};
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116
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117 compile.load = function (id, require, callback) {
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118 var url = require.toUrl(id);
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119 if (url in cache) {
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120 callback(cache[url]);
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121 } else {
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122 request(url).then(compile).then(function (tc) {
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123 callback(cache[url] = tc);
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124 }, function (err) {
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125 require.signal("error", [{
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126 error: err,
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127 src: 'implab/text/template-compile'
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128 }]);
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129 });
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130 }
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131 };
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132
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133 return compile;
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134 });