Fixed support for attribute selector

#1

edge/StringBuffer.js

@@ -5,10 +5,10 @@ class StringBuffer {
 
 	append(text) {
 		if (arguments.length > 1) {
-			throw new Error('Found exceed arguments')
+			throw new Error('Found too many arguments of', Array.prototype.slice.call(arguments))
 
 		} else if (typeof text === 'object' && text !== null) {
-			throw new Error('Found a non-string argument')
+			throw new Error('Found a non-string argument of', text)
 
 		} else if (text !== '') {
 			this.buffer.push(text)

edge/format.js

@@ -26,14 +26,16 @@ function format(content, options) {
 
 	function travel(parentNode, inputNode, indentLevel, insideExpression = false, data = {}) {
 		// Check argument type
-		if ([
-			_.isObject(parentNode) || parentNode === null && inputNode instanceof stylus.nodes.Root,
-			_.isObject(inputNode),
-			_.isInteger(indentLevel) && indentLevel >= 0,
-			_.isBoolean(insideExpression),
-			_.isPlainObject(data),
-		].some(constraint => !constraint)) {
-			throw new Error('Found one or many invalid arguments.')
+		if (!(_.isObject(parentNode) || parentNode === null && inputNode instanceof stylus.nodes.Root)) {
+			throw new Error(`Found a parent node of ${JSON.stringify(parentNode)}`)
+		} else if (!(_.isObject(inputNode))) {
+			throw new Error(`Found an input node of ${JSON.stringify(inputNode)}` + (parentNode ? `, which had a parent node of ${JSON.stringify(parentNode)}` : ''))
+		} else if (!(_.isInteger(indentLevel) && indentLevel >= 0)) {
+			throw new Error(`Found an indent level of ${JSON.stringify(indentLevel)}`)
+		} else if (!(_.isBoolean(insideExpression))) {
+			throw new Error(`Found an expression flag of ${JSON.stringify(insideExpression)}`)
+		} else if (!(_.isPlainObject(data))) {
+			throw new Error(`Found an additional data object of ${JSON.stringify(data)}`)
 		}
 
 		// Inject a parent node to the current working node
@@ -305,7 +307,12 @@ function format(content, options) {
 				if (_.get(lines, (inputNode.lineno - 1) + '.' + (inputNode.column - 1)) === '\\') {
 					outputBuffer.append('\\')
 				}
-				outputBuffer.append(inputNode.val)
+
+				if (_.isString(inputNode.val)) {
+					outputBuffer.append(inputNode.val)
+				} else {
+					outputBuffer.append(travel(inputNode, inputNode.val, indentLevel, true))
+				}
 			}
 
 		} else if (inputNode instanceof stylus.nodes.String) {
@@ -796,9 +803,6 @@ function format(content, options) {
 				outputBuffer.append(commentLines.map(line => indent + line).join(options.newLineChar)).append(options.newLineChar)
 			}
 
-		} else if (typeof inputNode === 'string') {
-			outputBuffer.append(inputNode)
-
 		} else {
 			warnings.push({ message: 'Found unknown object', data: inputNode })
 		}

spec/selector/input.styl

@@ -43,6 +43,9 @@ body
 
   .class5::after
     display none
+
+  &[data-quantity*="-"]
+    display none
 
 body > a
   display none

spec/selector/output.styl

@@ -58,6 +58,10 @@ body {
 	.class5::after {
 		display: none;
 	}
+
+	&[data-quantity*='-'] {
+		display: none;
+	}
 }
 
 body > a {