Tagging = function(context) {
this.site = 'grazia-nl-grz';
this.zone = 'home';
this.protocol = window.location.protocol;
this.autodetect_url = this.protocol + '//cts.snmmd.nl/service/detect/';
this.context = context;
this.positions = {};
this.positions_weighted = {};
this.positions['footer'] = '[{\"source\": \"\", \"weight\": null}, {\"source\": \"\", \"weight\": null}, {\"source\": \"\", \"weight\": null}, {\"source\": \"\", \"weight\": null}]';
this.positions_weighted['footer'] = false;
this.positions['head'] = '[{\"source\": \"\", \"weight\": null}]';
this.positions_weighted['head'] = false;
this.positions['medium-rectangle'] = '[{\"source\": \"\", \"weight\": 1}]';
this.positions_weighted['medium-rectangle'] = true;
this.positions['multiple-top'] = '[{\"source\": \"\", \"weight\": 1}]';
this.positions_weighted['multiple-top'] = true;
this.positions['pixel'] = '[{\"source\": \"\", \"weight\": 1}]';
this.positions_weighted['pixel'] = true;
this.positions['teaser'] = '[{\"source\": \"\", \"weight\": 1}]';
this.positions_weighted['teaser'] = true;
}
Tagging.prototype.get_json = function(text) {
return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(text.replace(/"(\\.|[^"\\])*"/g, '')))
&& eval('(' + text + ')');
}
Tagging.prototype.random_tag = function(position) {
var tags = [];
var weighted_tags = [];
for (index in position) {
tag = position[index];
tags[index] = tag.source;
for (var i = 0; i < tag.weight; i++) {
weighted_tags.push(index);
}
}
// Pick a random tag from array based on weight
var random_index = weighted_tags[Math.floor((Math.random() * weighted_tags.length))];
return tags[random_index];
}
Tagging.prototype.all_tags = function(position) {
var tags = [];
for (index in position) {
tag = position[index];
tags[index] = tag.source;
}
return tags.join("\n");
}
Tagging.prototype.render = function(slug, context) {
document.write(this.get_source(slug, context));
}
Tagging.prototype.get_source = function(slug, context) {
if (typeof this.positions[slug] == 'undefined') {
// This position doesn't exist, call the autodetect
this._detect(slug);
} else {
var position = this.get_json(this.positions[slug]);
var tag_source = "";
if (this.positions_weighted[slug]) {
tag_source = this.random_tag(position)
} else {
tag_source = this.all_tags(position);
}
// Replace variables
var variables = {};
for (variable in this.context) {
variables[variable] = this.context[variable];
}
for (variable in context) {
variables[variable] = context[variable];
}
tag_source = this._replace_variables(tag_source, variables);
// Remove unset variables and return result
return tag_source.replace(/\$\w+/g, "").replace(/\${\w+}/g, "");
}
return '';
}
Tagging.prototype.log = function(err) {
//this._load(error_endpoint);
}
Tagging.prototype._load = function(url) {
var head = document.getElementsByTagName('head')[0] || document.documentElement,
script = document.createElement('script');
script.type = 'text/javascript';
script.src = url;
head.appendChild(script);
}
Tagging.prototype._detect = function(position) {
this._load(this.autodetect_url + this.site +'/'+ this.zone +'/' + position + '/');
}
Tagging.prototype._replace_variables = function(content, variables) {
var RE_VALID_IDENT = /^[a-zA-Z_]\w*$/;
for (variable in variables) {
if (RE_VALID_IDENT.test(variable)) {
var regexes = [new RegExp('\\$' + variable, 'g'), new RegExp('\\${' + variable + '}', 'g')];
for (re in regexes) {
content = content.replace(regexes[re], variables[variable]);
}
} else {
throw "'" + variable + "' is not a valid identifier.";
}
}
return content;
}