1 files changed, 107 insertions, 0 deletions
diff --git a/stylis.js/src/Middleware.js b/stylis.js/src/Middleware.js
new file mode 100644
index 0000000..cec5f62
--- /dev/null
+++ b/stylis.js/src/Middleware.js
@@ -0,0 +1,107 @@
+import {MS, MOZ, WEBKIT, RULESET, KEYFRAMES, DECLARATION} from './Enum.js'
+import {match, charat, substr, strlen, sizeof, replace, combine} from './Utility.js'
+import {copy, tokenize} from './Tokenizer.js'
+import {serialize} from './Serializer.js'
+import {prefix} from './Prefixer.js'
+
+/**
+ * @param {function[]} collection
+ * @return {function}
+ */
+export function middleware (collection) {
+	var length = sizeof(collection)
+
+	return function (element, index, children, callback) {
+		var output = ''
+
+		for (var i = 0; i < length; i++)
+			output += collection[i](element, index, children, callback) || ''
+
+		return output
+	}
+}
+
+/**
+ * @param {function} callback
+ * @return {function}
+ */
+export function rulesheet (callback) {
+	return function (element) {
+		if (!element.root)
+			if (element = element.return)
+				callback(element)
+	}
+}
+
+/**
+ * @param {object} element
+ * @param {number} index
+ * @param {object[]} children
+ * @param {function} callback
+ */
+export function prefixer (element, index, children, callback) {
+	if (!element.return)
+		switch (element.type) {
+			case DECLARATION: element.return = prefix(element.value, element.length)
+				break
+			case KEYFRAMES:
+				return serialize([copy(replace(element.value, '@', '@' + WEBKIT), element, '')], callback)
+			case RULESET:
+				if (element.length)
+					return combine(element.props, function (value) {
+						switch (match(value, /(::plac\w+|:read-\w+)/)) {
+							// :read-(only|write)
+							case ':read-only': case ':read-write':
+								return serialize([copy(replace(value, /:(read-\w+)/, ':' + MOZ + '$1'), element, '')], callback)
+							// :placeholder
+							case '::placeholder':
+								return serialize([
+									copy(replace(value, /:(plac\w+)/, ':' + WEBKIT + 'input-$1'), element, ''),
+									copy(replace(value, /:(plac\w+)/, ':' + MOZ + '$1'), element, ''),
+									copy(replace(value, /:(plac\w+)/, MS + 'input-$1'), element, '')
+								], callback)
+						}
+
+						return ''
+					})
+		}
+}
+
+/**
+ * @param {object} element
+ * @param {number} index
+ * @param {object[]} children
+ */
+export function namespace (element) {
+	switch (element.type) {
+		case RULESET:
+			element.props = element.props.map(function (value) {
+				return combine(tokenize(value), function (value, index, children) {
+					switch (charat(value, 0)) {
+						// \f
+						case 12:
+							return substr(value, 1, strlen(value))
+						// \0 ( + > ~
+						case 0: case 40: case 43: case 62: case 126:
+							return value
+						// :
+						case 58:
+							if (children[index + 1] === 'global')
+								children[index + 1] = '', children[index + 2] = '\f' + substr(children[index + 2], index = 1, -1)
+						// \s
+						case 32:
+							return index === 1 ? '' : value
+						default:
+							switch (index) {
+								case 0: element = value
+									return sizeof(children) > 1 ? '' : value
+								case index = sizeof(children) - 1: case 2:
+									return index === 2 ? value + element + element : value + element
+								default:
+									return value
+							}
+					}
+				})
+			})
+	}
+}