From 152c5c0f88d4918c2ad5a43b491602223170152a Mon Sep 17 00:00:00 2001
From: Erin <erin@erindesu.cz>
Date: Mon, 18 Apr 2022 21:42:26 +0200
Subject: [PATCH] replaced if with unless

---
 ablescript/src/ast.rs           |  2 +-
 ablescript/src/interpret.rs     |  6 +++---
 ablescript/src/lexer.rs         | 10 +++++-----
 ablescript/src/parser.rs        | 28 ++++++++++++++--------------
 examples/pass-by-reference.able |  4 ++--
 5 files changed, 25 insertions(+), 25 deletions(-)

diff --git a/ablescript/src/ast.rs b/ablescript/src/ast.rs
index edf276c5..50f9ceb4 100644
--- a/ablescript/src/ast.rs
+++ b/ablescript/src/ast.rs
@@ -103,7 +103,7 @@ pub type Block = Vec<Spanned<Stmt>>;
 #[derive(Debug, PartialEq, Clone, Hash)]
 pub enum Stmt {
     // Control flow
-    If {
+    Unless {
         cond: Spanned<Expr>,
         body: Block,
     },
diff --git a/ablescript/src/interpret.rs b/ablescript/src/interpret.rs
index 8134a3e2..52e88942 100644
--- a/ablescript/src/interpret.rs
+++ b/ablescript/src/interpret.rs
@@ -247,8 +247,8 @@ impl ExecEnv {
                     }),
                 );
             }
-            Stmt::If { cond, body } => {
-                if self.eval_expr(cond)?.into_abool().to_bool() {
+            Stmt::Unless { cond, body } => {
+                if !self.eval_expr(cond)?.into_abool().to_bool() {
                     return self.eval_stmts_hs(body, true);
                 }
             }
@@ -743,7 +743,7 @@ mod tests {
         let mut env = ExecEnv::new();
         eval(
             &mut env,
-            "dim foo 1; 2 =: foo; if (always) { dim foo 3; 4 =: foo; }",
+            "dim foo 1; 2 =: foo; unless (never) { dim foo 3; 4 =: foo; }",
         )
         .unwrap();
 
diff --git a/ablescript/src/lexer.rs b/ablescript/src/lexer.rs
index 3da3842d..e95d663c 100644
--- a/ablescript/src/lexer.rs
+++ b/ablescript/src/lexer.rs
@@ -87,8 +87,8 @@ pub enum Token {
     TDark,
 
     // Control flow keywords
-    #[token("if")]
-    If,
+    #[token("unless")]
+    Unless,
 
     #[token("loop")]
     Loop,
@@ -156,7 +156,7 @@ mod tests {
 
     #[test]
     fn simple_fn() {
-        let code = "functio test() { dim var 3; if (var = 3) { var print } }";
+        let code = "functio test() { dim var 3; unless (var ain't 3) { var print } }";
         let expected = &[
             Functio,
             Identifier("test".to_owned()),
@@ -167,10 +167,10 @@ mod tests {
             Identifier("var".to_owned()),
             Integer(3),
             Semicolon,
-            If,
+            Unless,
             LeftParen,
             Identifier("var".to_owned()),
-            Equals,
+            Aint,
             Integer(3),
             RightParen,
             LeftCurly,
diff --git a/ablescript/src/parser.rs b/ablescript/src/parser.rs
index 977fd73a..5256a48d 100644
--- a/ablescript/src/parser.rs
+++ b/ablescript/src/parser.rs
@@ -66,7 +66,7 @@ impl<'source> Parser<'source> {
         let start = self.lexer.span().start;
 
         match token {
-            Token::If => Ok(Spanned::new(self.if_flow()?, start..self.lexer.span().end)),
+            Token::Unless => Ok(Spanned::new(self.unless_flow()?, start..self.lexer.span().end)),
             Token::Functio => Ok(Spanned::new(
                 self.functio_flow()?,
                 start..self.lexer.span().end,
@@ -419,9 +419,9 @@ impl<'source> Parser<'source> {
     /// Parse If flow
     ///
     /// Consists of condition and block, there is no else
-    fn if_flow(&mut self) -> Result<Stmt, Error> {
+    fn unless_flow(&mut self) -> Result<Stmt, Error> {
         self.require(Token::LeftParen)?;
-        Ok(Stmt::If {
+        Ok(Stmt::Unless {
             cond: self.expr_flow(Token::RightParen)?,
             body: self.get_block()?,
         })
@@ -674,32 +674,32 @@ mod tests {
 
     #[test]
     fn if_flow() {
-        let code = "if (var = always) { /*Buy Able products!*/ print; }";
+        let code = "unless (never + never) { /*Buy Able products!*/ print; }";
         let expected = &[Spanned {
-            item: Stmt::If {
+            item: Stmt::Unless {
                 cond: Spanned {
                     item: Expr::BinOp {
                         lhs: Box::new(Spanned {
-                            item: Expr::Variable("var".to_owned()),
-                            span: 4..5,
+                            item: Expr::Variable("never".to_owned()),
+                            span: 8..13,
                         }),
                         rhs: Box::new(Spanned {
-                            item: Expr::Variable("always".to_owned()),
-                            span: 9..15,
+                            item: Expr::Variable("never".to_owned()),
+                            span: 16..21,
                         }),
-                        kind: BinOpKind::Equal,
+                        kind: BinOpKind::Add,
                     },
-                    span: 4..15,
+                    span: 8..21,
                 },
                 body: vec![Spanned {
                     item: Stmt::Print(Spanned {
                         item: Expr::Literal(Literal::Str("Buy Able products!".to_owned())),
-                        span: 19..39,
+                        span: 25..47,
                     }),
-                    span: 19..46,
+                    span: 25..54,
                 }],
             },
-            span: 0..48,
+            span: 0..56,
         }];
 
         let ast = Parser::new(code).init().unwrap();
diff --git a/examples/pass-by-reference.able b/examples/pass-by-reference.able
index 8beefe34..cde0c378 100644
--- a/examples/pass-by-reference.able
+++ b/examples/pass-by-reference.able
@@ -12,12 +12,12 @@ dim bar /*world*/;
 
 swap(foo, bar);
 
-if (foo ain't /*world*/) {
+unless (foo = /*world*/) {
    /*FAILED*/ print;
    /*foo should be 'world', is actually:*/ print;
    foo print;
 }
 
-if (foo = /*world*/) {
+unless (foo ain't /*world*/) {
    /*OK*/ print;
 }