usage.js
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var hasOwnProperty = Object.prototype.hasOwnProperty;
function buildMap(list, caseInsensitive) {
var map = Object.create(null);
if (!Array.isArray(list)) {
return false;
}
for (var i = 0; i < list.length; i++) {
var name = list[i];
if (caseInsensitive) {
name = name.toLowerCase();
}
map[name] = true;
}
return map;
}
function buildIndex(data) {
var scopes = false;
if (data.scopes && Array.isArray(data.scopes)) {
scopes = Object.create(null);
for (var i = 0; i < data.scopes.length; i++) {
var list = data.scopes[i];
if (!list || !Array.isArray(list)) {
throw new Error('Wrong usage format');
}
for (var j = 0; j < list.length; j++) {
var name = list[j];
if (hasOwnProperty.call(scopes, name)) {
throw new Error('Class can\'t be used for several scopes: ' + name);
}
scopes[name] = i + 1;
}
}
}
return {
tags: buildMap(data.tags, true),
ids: buildMap(data.ids),
classes: buildMap(data.classes),
scopes: scopes
};
}
module.exports = {
buildIndex: buildIndex
};