1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/* CodeQ: an online programming tutor.
Copyright (C) 2016 UL FRI
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option) any
later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
(function () {
"use strict";
// resource tree, loaded from data/resources.json in the boot sequence
var resources = {};
var resolveResource = function (resourceName, resourceBranches) {
var traversedPath = ['data'], // top-level directory
branch = resources,
candidate = null,
i, fragment;
if (!resourceName) {
codeq.log.error('No resource name provided; ' +
'path: "' + resourceBranches.join('/') + '"');
return null;
}
if (branch[resourceName]) candidate = 'data/' + resourceName; // top-level match
for (i = 0; i < resourceBranches.length; i++) {
fragment = resourceBranches[i];
branch = branch[fragment];
if (!branch) {
codeq.log.error('Resource sub-branch ' + fragment + ' does not exist; ' +
'resource: "' + resourceName + '", ' +
'path: "' + resourceBranches.join('/') + '"');
break;
}
traversedPath.push(fragment);
if (branch[resourceName]) {
candidate = traversedPath.join('/') + '/' + resourceName;
}
}
if (candidate) return codeq.ajaxPrefix + candidate;
codeq.log.error('Resource ' + resourceName + ' was not found; ' +
'path: "' + resourceBranches.join('/') + '"');
return null;
};
// parse a key-value string of the form: a=1 b='2 + 3' c="4"
var parseKeyval = function (str) {
// match foo=bar, foo="bar", foo = 'bar baz' etc.
var regex = /\s*([^=\s]*)\s*=\s*([^'"]\S*|"[^"]*"|'[^']*')/g,
dict = {},
match, key, val;
while ((match = regex.exec(str)) !== null) {
key = match[1];
val = match[2];
if (val[0] == val[val.length-1] && (val[0] === '"' || val[0] === "'")) {
val = val.slice(1, -1);
}
dict[key] = val;
}
return dict;
};
var directiveHandlers = {
'resource': function (str, templatePath) {
return resolveResource(str, templatePath) || 'data/broken.png';
},
'img': function (str, templatePath) {
var attrs = parseKeyval(str),
output, key;
output = '<img ';
for (key in attrs) {
if (!attrs.hasOwnProperty(key)) continue;
switch (key) {
case 'src':
output += 'src="' + resolveResource(attrs[key], templatePath) + '" ';
break;
case 'alt':
output += 'alt="' + codeq.escapeHtml(attrs[key]) + '" ';
break;
case 'class':
output += 'class="' + attrs[key] + '" ';
break;
}
}
output += '/>';
return output;
}
};
// convert latex math notation to MathML
var renderMath = function (str) {
// inline math delimited by \( \)
str = str.replace(/\\\((.*?)\\\)/g, function (match, expression) {
return katex.renderToString(expression);
});
// display math delimited by \[ \]
str = str.replace(/\\\[(.*?)\\\]/g, function (match, expression) {
return katex.renderToString(expression, {'displayMode': true});
});
return str;
};
// instantiate template with args
var process = function (template, templatePath, args) {
var templateName,
key, subpart, start, end, match, handler,
output = '';
// escape arguments
args = args || {};
for (key in args) {
if (!args.hasOwnProperty(key)) continue;
args[key] = codeq.escapeHtml(args[key]);
}
if (!templatePath) templatePath = [];
templateName = templatePath.join('/');
end = 0;
while ((start = template.indexOf('[%', end)) != -1) {
// add remaining text from previous iteration
output += template.substring(end, start);
if (template.substr(start+2, 2) === '--') { // a comment start
if ((end = template.indexOf('--%]', start+4)) == -1) {
break;
}
end += 4;
}
else { // a start of a statement or of a value reference
if ((end = template.indexOf('%]', start+2)) == -1) {
break;
}
subpart = template.substring(start+2, end).trim();
end += 2;
if ((match = subpart.match(/(.)(\S+)(.*)/)) === null) {
codeq.log.error('Invalide template in ' + templateName + ': ' + subpart);
continue;
}
switch (match[1]) {
case '=': // a value reference
output += String(args[match[2]]);
break;
case '@': // a directive
handler = directiveHandlers[match[2]];
if (handler) {
output += handler(match[3].trim(), templatePath);
}
else {
codeq.log.error('Invalid directive in ' + templateName + ': ' + match[2]);
}
break;
default:
codeq.log.error('Invalid template in ' + templateName + ': ' + subpart);
}
}
}
// add any remaining text
output += template.substr(end == -1 ? start : end);
// render latex formulas
return renderMath(output);
};
codeq.template = {
'setResources': function (newResources) {
resources = newResources;
},
// instantiate a template
'process': process,
// instantiate templates in a lang→template dictionary
'processDictionary': function (dict, templatePath, args) {
var lang;
for (lang in dict) {
if (!dict.hasOwnProperty(lang)) continue;
dict[lang] = codeq.template.process(dict[lang], templatePath, args);
}
}
};
})();
|
