Fix regressions in stylelint.

Author: chriseppstein

src/__tests__/exceptions.js

@@ -23,3 +23,4 @@ throws('bad syntax', '-moz-osx-font-smoothing: grayscale');
 throws('missing backslash for semicolon', '.;');
 throws('missing backslash for semicolon', '.\;');
 throws('unexpected / foo', '-Option\/root', "Unexpected '/'. Escaping special characters with \\ may help.");
+throws('bang in selector', '.foo !optional', "Unexpected '!'. Escaping special characters with \\ may help.");

src/__tests__/nonstandard.js

@@ -18,3 +18,18 @@ test('leading combinator', '> *', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].value, '>');
     t.deepEqual(tree.nodes[0].nodes[1].value, '*');
 });
+
+test('sass escapes', '.#{$classname}', (t, tree) => {
+    t.deepEqual(tree.nodes[0].nodes.map(n => n.type), ["class"]);
+    t.deepEqual(tree.nodes[0].nodes[0].value, "#{$classname}");
+});
+
+test('sass escapes', '[lang=#{$locale}]', (t, tree) => {
+    t.deepEqual(tree.nodes[0].nodes.map(n => n.type), ["attribute"]);
+    t.deepEqual(tree.nodes[0].nodes[0].value, "#{$locale}");
+});
+
+test('placeholder', '%foo', (t, tree) => {
+    t.deepEqual(tree.nodes[0].nodes.map(n => n.type), ["tag"]);
+    t.deepEqual(tree.nodes[0].nodes[0].value, "%foo");
+});

src/parser.js

@@ -227,6 +227,15 @@ export default class Parser {
                 spaceAfterMeaningfulToken = false;
                 break;
             case tokens.dollar:
+                if (lastAdded === "value") {
+                    let oldRawValue = getProp(node, 'raws', 'value');
+                    node.value += "$";
+                    if (oldRawValue) {
+                        node.raws.value = oldRawValue + "$";
+                    }
+                    break;
+                }
+                // Falls through
             case tokens.caret:
                 if (next[TOKEN.TYPE] === tokens.equals) {
                     node.operator = content;

src/tokenize.js

@@ -195,6 +195,7 @@ export default function tokenize (input) {
         // Consume these characters as single tokens.
         case t.asterisk:
         case t.ampersand:
+        case t.bang:
         case t.comma:
         case t.equals:
         case t.dollar: