Refine and add statements.

src/parser/ast.yaml

@@ -311,3 +311,133 @@ Member:
           on: rule_present
     - identifier
     - type_use
+
+# Statements
+Statement:
+  rules:
+    - VariableDeclaration
+    - AssignmentStatement
+    - ExpressionStatement
+    - UseStatement
+    - IfElseStatement
+    - IfStatementStatement
+    - WhileStatement
+    - ForStatement
+VariableDeclaration:
+  children:
+    - let_kw:
+        rule: Let
+        skip: true
+    - is_mut:
+        rule: Mut
+        build:
+          type: boolean
+          on: rule_present
+    - identifier
+    - type_use:
+        optional: true
+    - expression:
+        optional: true
+AssignmentStatement:
+  children:
+    - left:
+        rule: Expression
+    - right:
+        rule: Expression
+ExpressionStatement:
+  children:
+    - expression
+IfStatement:
+  children:
+    - if_kw:
+        rule: If
+        skip: true
+    - expression
+    - then_kw:
+        rule: Then
+        skip: true
+    - statements:
+        rule: Statement
+        vec: true
+    - end_kw:
+        rule: End
+        skip: true
+IfElseStatement:
+  children:
+    - if_else_first
+    - if_else_ifs:
+        rule: IfElseIf
+        vec: true
+    - if_else_else
+IfElseFirst:
+  children:
+    - if_kw:
+        rule: If
+        skip: true
+    - expression
+    - then_kw:
+        rule: Then
+        skip: true
+    - statements:
+        rule: Statement
+        vec: true
+IfElseIf:
+  children:
+    - else_kw:
+        rule: Else
+        skip: true
+    - if_kw:
+        rule: If
+        skip: true
+    - expression
+    - then_kw:
+        rule: Then
+        skip: true
+    - statements:
+        rule: Statement
+        vec: true
+IfElseElse:
+  children:
+    - else_kw:
+        rule: Else
+        skip: true
+    - statements:
+        rule: Statement
+        vec: true
+    - end_kw:
+        rule: End
+        skip: true
+WhileStatement:
+  children:
+    - while_kw:
+        rule: While
+        skip: true
+    - expression
+    - do_kw:
+        rule: Do
+        skip: true
+    - statements:
+        rule: Statement
+        vec: true
+    - end_kw:
+        rule: End
+        skip: true
+ForStatement:
+  children:
+    - for_kw:
+        rule: For
+        skip: true
+    - identifier
+    - in_kw:
+        rule: In
+        skip: true
+    - expression
+    - do_kw:
+        rule: Do
+        skip: true
+    - statement:
+        rule: Statement
+        vec: true
+    - end_kw:
+        rule: End
+        vec: true

src/parser/deimos.pest

@@ -30,6 +30,8 @@ Alias = { "alias" }
 True = { "true" }
 False = { "false" }
 Use = { "use" }
+Then = { "then" }
+Do = { "do" }
 End = { "end" }
 Companion = { "comp" }
 
@@ -535,29 +537,15 @@ Member = {
 
 // Statements
 
-BlockStatement = {
-      "{"
-    ~ Statement*
-    ~ Expression?
-    ~ "}"
-}
-
 Statement = {
-      (
+      VariableDeclaration
-          VariableDeclaration
+    | AssignmentStatement
-        | AssignmentStatement
+    | ExpressionStatement
-        | CallStatement
+    | UseStatement
-        | ReturnStatement
+    | IfElseStatement
-        | UseStatement
+    | IfStatement
-      )
+    | WhileStatement
-    ~ Semicolon
+    | ForStatement
-    | (
-          BlockStatement
-        | IfElseStatement
-        | IfStatement
-        | WhileStatement
-        | ForStatement
-      )
 }
 
 VariableDeclaration = {
@@ -574,63 +562,61 @@ AssignmentStatement = {
     ~ Expression
 }
 
-CallStatement = { 
+ExpressionStatement = {
-      PrimaryExpression
+      Expression
-    ~ ObjectAccess?
-    ~ ParenthesesCall
-    ~ (
-          ObjectAccess
-        | ParenthesesCall
-        | PlusPlus
-        | MinusMinus
-      )*    
-}
-
-ReturnStatement = {
-      Return
-    ~ Expression?
 }
 
 IfStatement = {
       If
-    ~ "("
     ~ Expression
-    ~ ")"
+    ~ Then
-    ~ BlockStatement
+    ~ Statement*
+    ~ End
 }
 
 IfElseStatement = {
-      IfStatement
+      IfElseFirst
-    ~ ElseIf*
+    ~ IfElseIf*
-    ~ ElseBlock?
+    ~ IfElseElse
 }
 
-ElseIf = {
+IfElseFirst = {
-      Else
+      If
-    ~ IfStatement
+    ~ Expression
+    ~ Then
+    ~ Statement*
 }
 
-ElseBlock = {
+IfElseIf = {
       Else
-    ~ BlockStatement
+    ~ If
+    ~ Expression
+    ~ Then
+    ~ Statement*
+}
+
+IfElseElse = {
+      Else
+    ~ Statement*
+    ~ End
 }
 
 WhileStatement = {
       While
-    ~ "("
     ~ Expression
-    ~ ")"
+    ~ Do
-    ~ BlockStatement
+    ~ Statement*
+    ~ End
 }
 
 ForStatement = {
       For
-    ~ "("
     ~ Identifier
     ~ In
     ~ Expression
-    ~ ")"
+    ~ Do
-    ~ BlockStatement
+    ~ Statement*
+    ~ End
 }
 
 // Expressions
@@ -740,6 +726,18 @@ ObjectIndex = {
 
 // Calls
 
+CallExpression = {
+      PrimaryExpression
+    ~ ObjectAccess?
+    ~ ParenthesesCall
+    ~ (
+          ObjectAccess
+        | ParenthesesCall
+        | PlusPlus
+        | MinusMinus
+      )*
+}
+
 ParenthesesCall = {
       TurboFish?
     ~ "("