Fix #96 SCSS parser failure (S2260): parser does not support identifiers starting with '-#'

Author: racodond

css-frontend/src/main/java/org/sonar/css/parser/LexicalGrammar.java

@@ -299,6 +299,8 @@ public enum LexicalGrammar implements GrammarRuleKey {
   SCSS_MULTILINE_STRING,
   SCSS_MULTILINE_STRING_LITERAL,
 
+  SCSS_IDENT,
+
   /* Less */
   LESS_VARIABLE_DECLARATION,
   LESS_VARIABLE_DECLARATION_AS_PARAMETER,
@@ -623,10 +625,17 @@ private static void scss(LexerlessGrammarBuilder b) {
     b.rule(SCSS_AT_ROOT_WITH).is(SPACING, b.token(GenericTokenType.LITERAL, "with"));
     b.rule(SCSS_AT_ROOT_WITHOUT).is(SPACING, b.token(GenericTokenType.LITERAL, "without"));
 
+    b.rule(SCSS_IDENT).is(
+      b.firstOf(
+        b.regexp("(?i)(progid:DXImageTransform\\.Microsoft\\.[a-z]+)"),
+        b.sequence(_NMSTART, b.zeroOrMore(_NMCHAR)),
+        b.oneOrMore(_NMCHAR)))
+      .skip();
+
     b.rule(SCSS_IDENT_INTERPOLATED_IDENTIFIER_NO_WS).is(
       b.token(GenericTokenType.LITERAL,
         b.sequence(
-          b.optional(IDENT_IDENTIFIER_NO_WS),
+          b.optional(SCSS_IDENT),
           b.regexp("#\\{[^\\n\\r\\f\\}]*\\}"),
           b.zeroOrMore(
             b.firstOf(

css-frontend/src/test/java/org/sonar/css/parser/scss/ClassSelectorTreeTest.java

@@ -41,6 +41,8 @@ public void classSelector() {
     checkParsed(".abc#{$class}", "abc#{$class}", true);
     checkParsed(".abc#{$class}#{$class1}def", "abc#{$class}#{$class1}def", true);
     checkParsed(".abc#{$class}e#{$class1}def", "abc#{$class}e#{$class1}def", true);
+    checkParsed(".-abc#{$class}e#{$class1}def", "-abc#{$class}e#{$class1}def", true);
+    checkParsed(".--abc#{$class}e#{$class1}def", "--abc#{$class}e#{$class1}def", true);
   }
 
   @Test

css-frontend/src/test/java/org/sonar/css/parser/scss/IdSelectorTreeTest.java

@@ -35,6 +35,8 @@ public IdSelectorTreeTest() {
   public void idSelector() {
     checkParsed("#id", "id", false);
     checkParsed("#id#{$abc}-def", "id#{$abc}-def", true);
+    checkParsed("#-id#{$abc}-def", "-id#{$abc}-def", true);
+    checkParsed("#--id#{$abc}-def", "--id#{$abc}-def", true);
   }
 
   @Test

css-frontend/src/test/java/org/sonar/css/parser/scss/ScssInterpolatedIdentifierNoWSTreeTest.java

@@ -40,6 +40,7 @@ public void scssInterpolatedIdentifierNoWS() {
     checkParsed("abc#{$class}");
     checkParsed("abc#{$class}#{$class1}def");
     checkParsed("-moz-abc#{$class}e#{$class1}def");
+    checkParsed("--abc#{$class}e#{$class1}def");
   }
 
   @Test

css-frontend/src/test/java/org/sonar/css/parser/scss/ScssInterpolatedIdentifierTreeTest.java

@@ -38,6 +38,8 @@ public void scssInterpolatedIdentifier() {
     checkParsed(" -moz-abc#{ $abc * 2 + 3}e#{$class1}def", "-moz-abc#{ $abc * 2 + 3}e#{$class1}def");
     checkParsed("#{ 2 * 3 + 5 + $abc}", "#{ 2 * 3 + 5 + $abc}");
     checkParsed("abc#{ 2 * 3 + 5 + $abc}def", "abc#{ 2 * 3 + 5 + $abc}def");
+    checkParsed("-abc#{ 2 * 3 + 5 + $abc}def", "-abc#{ 2 * 3 + 5 + $abc}def");
+    checkParsed("--abc#{ 2 * 3 + 5 + $abc}def", "--abc#{ 2 * 3 + 5 + $abc}def");
   }
 
   @Test

css-frontend/src/test/java/org/sonar/css/parser/scss/ScssMixinTreeTest.java

@@ -95,6 +95,8 @@ public void scssMixin() {
     assertThat(tree.block().propertyDeclarations()).hasSize(2);
     assertThat(tree.block().rulesets()).hasSize(2);
     assertThat(tree.block().scssMixinIncludes()).hasSize(2);
+
+    checkParsed("@mixin view-mixin($key) { &-#{$key}-view { color: red; } }");
   }
 
   @Test