refactor(language): module and node declarations

* New default file extension: .refinery (.problem is also supported).
* Add module keyword for self-contained modules.
* Rename indiv declarations to atom declaration.
* Add node and multi declarations for explicitly declared nodes and
  multi-objects, respectively.

3 files changed, 16 insertions, 10 deletions

diff --git a/subprojects/frontend/src/editor/EditorTheme.ts b/subprojects/frontend/src/editor/EditorTheme.ts
index 1cad4a36..f499b0d9 100644
--- a/subprojects/frontend/src/editor/EditorTheme.ts
+++ b/subprojects/frontend/src/editor/EditorTheme.ts
@@ -126,7 +126,7 @@ export default styled('div', {
         color: theme.palette.text.secondary,
       },
     },
-    '.tok-problem-individual': {
+    '.tok-problem-atom': {
       '&, & .tok-variableName': {
         color: theme.palette.text.primary,
       },
diff --git a/subprojects/frontend/src/language/problem.grammar b/subprojects/frontend/src/language/problem.grammar
index ce3baa02..b08a9c36 100644
--- a/subprojects/frontend/src/language/problem.grammar
+++ b/subprojects/frontend/src/language/problem.grammar
@@ -28,7 +28,7 @@ statement {
     (":" Expr)? "."
   } |
   ProblemDeclaration {
-    kw<"problem"> QualifiedName "."
+    (ckw<"module"> | kw<"problem">) QualifiedName "."
   } |
   ClassDefinition {
     kw<"abstract">? kw<"class"> RelationName
@@ -37,7 +37,7 @@ statement {
   } |
   EnumDefinition {
     kw<"enum"> RelationName
-    (EnumBody { "{" sep<",", IndividualNodeName> "}" } | ".")
+    (EnumBody { "{" sep<",", AtomNodeName> "}" } | ".")
   } |
   PredicateDefinition {
     (
@@ -56,8 +56,11 @@ statement {
   //  RuleName ParameterList<Parameter>?
   //  RuleBody { ":" sep<OrOp, Conjunction> "==>" sep<OrOp, Consequent> "." }
   //} |
-  IndividualDeclaration {
-    kw<"indiv"> sep<",", IndividualNodeName> "."
+  AtomDeclaration {
+    ckw<"atom"> sep<",", AtomNodeName> "."
+  } |
+  NodeDeclaration {
+    (ckw<"node"> | ckw<"multi">) sep<",", NodeName> "."
   } |
   ScopeDeclaration {
     kw<"scope"> sep<",", ScopeElement> "."
@@ -161,7 +164,7 @@ RelationName { QualifiedName ~name }
 
 //RuleName { QualifiedName }
 
-IndividualNodeName { QualifiedName }
+AtomNodeName { QualifiedName }
 
 VariableName[@dynamicPrecedence=10] { QualifiedName ~name }
 
diff --git a/subprojects/frontend/src/language/problemLanguageSupport.ts b/subprojects/frontend/src/language/problemLanguageSupport.ts
index 2121e05f..3847fdd8 100644
--- a/subprojects/frontend/src/language/problemLanguageSupport.ts
+++ b/subprojects/frontend/src/language/problemLanguageSupport.ts
@@ -27,7 +27,8 @@ const parserWithMetadata = parser.configure({
     styleTags({
       LineComment: t.lineComment,
       BlockComment: t.blockComment,
-      'problem class enum pred fn indiv scope': t.definitionKeyword,
+      'module problem class enum pred fn scope': t.definitionKeyword,
+      'node atom multi': t.definitionKeyword,
       'abstract extends refers contains container opposite': t.modifier,
       'default error contained containment': t.modifier,
       'true false unknown error': t.keyword,
@@ -44,7 +45,7 @@ const parserWithMetadata = parser.configure({
       String: t.string,
       'RelationName/QualifiedName': t.typeName,
       // 'RuleName/QualifiedName': t.typeName,
-      'IndividualNodeName/QualifiedName': t.atom,
+      'AtomNodeName/QualifiedName': t.atom,
       'VariableName/QualifiedName': t.variableName,
       '{ }': t.brace,
       '( )': t.paren,
@@ -54,7 +55,8 @@ const parserWithMetadata = parser.configure({
     }),
     indentNodeProp.add({
       ProblemDeclaration: indentDeclaration,
-      UniqueDeclaration: indentDeclaration,
+      AtomDeclaration: indentDeclaration,
+      NodeDeclaration: indentDeclaration,
       ScopeDeclaration: indentDeclaration,
       PredicateBody: indentPredicateOrRule,
       FunctionBody: indentPredicateOrRule,
@@ -70,7 +72,8 @@ const parserWithMetadata = parser.configure({
       // RuleBody: foldInside,
       Conjunction: foldConjunction,
       // Consequent: foldWholeNode,
-      UniqueDeclaration: foldDeclaration,
+      AtomDeclaration: foldDeclaration,
+      NodeDeclaration: foldDeclaration,
       ScopeDeclaration: foldDeclaration,
       BlockComment: foldBlockComment,
     }),