highlight: function (text, ast) {
function makeCallback(value) {
if (_.isFunction(value)) {
return value;
}
return function (node) {
return node[value];
};
}
var highlighter = this,
nodeHighlighters = highlighter.options.nodes,
getOffset = makeCallback(highlighter.options.offset),
getLength = makeCallback(highlighter.options.length),
getType = makeCallback(highlighter.options.type),
parts = text.split('');
_.forOwn(ast, function highlight(node) {
if (typeof node === 'object' && hasOwn.call(nodeHighlighters, getType(node))) {
nodeHighlighters[getType(node)](node, function (node, replacement) {
var i,
l;
parts[getOffset(node)] = replacement;
for (i = getOffset(node) + 1, l = getOffset(node) + getLength(node); i < l; i++) {
parts[i] = '';
}
});
}
if (_.isArray(node)) {
_.each(node, function (element) {
highlight(element);
});
} else if (_.isPlainObject(node)) {
_.forOwn(node, function (property) {
highlight(property);
});
}
});
return parts.join('');
}
_.forOwn(ast, function highlight(node) {
if (typeof node === 'object' && hasOwn.call(nodeHighlighters, getType(node))) {
nodeHighlighters[getType(node)](node, function (node, replacement) {
var i,
l;
parts[getOffset(node)] = replacement;
for (i = getOffset(node) + 1, l = getOffset(node) + getLength(node); i < l; i++) {
parts[i] = '';
}
});
}
if (_.isArray(node)) {
_.each(node, function (element) {
highlight(element);
});
} else if (_.isPlainObject(node)) {
_.forOwn(node, function (property) {
highlight(property);
});
}
});