[Syntax] Parse var/val binding as statemente

src/codegen/binding.rs

@@ -1,5 +1,5 @@
 use super::Transpilable;
-use crate::syntax::ast::Binding;
+use crate::syntax::ast::var_binding::Binding;
 
 impl Transpilable for Binding {
     /// Transpiles val and var bindings into PHP.
@@ -22,7 +22,10 @@ impl Transpilable for Binding {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::syntax::ast::{Binding, Expression, ValBinding};
+    use crate::syntax::ast::{
+        var_binding::{Binding, ValBinding},
+        Expression,
+    };
 
     #[test]
     fn binding_should_transpile() {

src/codegen/module_ast.rs

@@ -18,7 +18,10 @@ impl Transpilable for ModuleAST {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::syntax::ast::{Binding, Expression, TopLevelDeclaration, ValBinding};
+    use crate::syntax::ast::{
+        var_binding::{Binding, ValBinding},
+        Expression, TopLevelDeclaration,
+    };
 
     #[test]
     fn module_ast_should_transpile() {

src/syntax/ast/mod.rs

@@ -1,5 +1,6 @@
 pub mod functions;
 pub mod statement;
+pub mod var_binding;
 
 pub struct ModuleAST {
     pub declarations: Vec<TopLevelDeclaration>,
@@ -7,7 +8,7 @@ pub struct ModuleAST {
 
 #[derive(Debug)]
 pub enum TopLevelDeclaration {
-    Binding(Binding),
+    Binding(var_binding::Binding),
     FunctionDeclaration(FunctionDeclaration),
 }
 
@@ -25,26 +26,6 @@ pub struct Block {
 #[derive(Debug)]
 pub struct ParamsList {}
 
-#[derive(Debug)]
-pub enum Binding {
-    Val(ValBinding),
-    Var(VarBinding),
-}
-
-#[derive(Debug)]
-pub struct ValBinding {
-    pub datatype: Option<String>,
-    pub identifier: Box<String>,
-    pub expression: Expression,
-}
-
-#[derive(Debug)]
-pub struct VarBinding {
-    pub datatype: Option<String>,
-    pub identifier: Box<String>,
-    pub expression: Expression,
-}
-
 #[derive(Debug)]
 pub enum Expression {
     Number(Box<String>),

src/syntax/ast/statement.rs

@@ -1,6 +1,7 @@
-use super::functions::FunctionCall;
+use super::{functions::FunctionCall, var_binding::Binding};
 
 #[derive(Debug)]
 pub enum Statement {
     FunctionCall(FunctionCall),
+    Binding(Binding),
 }

src/syntax/ast/var_binding.rs

@@ -0,0 +1,21 @@
+use super::Expression;
+
+#[derive(Debug)]
+pub enum Binding {
+    Val(ValBinding),
+    Var(VarBinding),
+}
+
+#[derive(Debug)]
+pub struct ValBinding {
+    pub datatype: Option<String>,
+    pub identifier: Box<String>,
+    pub expression: Expression,
+}
+
+#[derive(Debug)]
+pub struct VarBinding {
+    pub datatype: Option<String>,
+    pub identifier: Box<String>,
+    pub expression: Expression,
+}

src/syntax/binding.rs

@@ -1,14 +1,10 @@
-use super::ast::{Binding, ValBinding, VarBinding};
+use super::ast::var_binding::{Binding, ValBinding, VarBinding};
 use super::utils::{try_operator, try_token_type};
 use super::{expression, ParseResult};
 use crate::error_handling::SyntaxError;
 use crate::lexic::token::{Token, TokenType};
 use crate::utils::Result3;
 
-// TODO: Should return a 3 state value:
-// - Success: binding parsed successfully
-// - NotFound: the first token (var | val) was not found, so the parser should try other options
-// - Error: token (var | val) was found, but then other expected tokens were not found
 pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Binding, ()> {
     let mut current_pos = pos;
     // Optional datatype annotation
@@ -19,9 +15,7 @@ pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Binding,
                 Some(String::from(&t.value))
             }
             Result3::Err(_) => None,
-            Result3::None => panic!(
-                "Internal compiler error: Illegal token stream at src/syntax/binding.rs#try_parse"
-            ),
+            Result3::None => return ParseResult::Unmatched,
         }
     };
 

src/syntax/block.rs

@@ -32,7 +32,6 @@ pub fn parse_block<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Block,
         ParseResult::Mismatch(_) => {}
     }
 
-
     // Parse closing brace
     let (_closing_brace, next_pos) =
         match parse_token_type(tokens, current_pos, TokenType::RightBrace) {
@@ -55,10 +54,5 @@ pub fn parse_block<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Block,
         };
     current_pos = next_pos;
 
-    ParseResult::Ok(
-        Block {
-            statements,
-        },
-        current_pos,
-    )
+    ParseResult::Ok(Block { statements }, current_pos)
 }

src/syntax/statement.rs

@@ -1,17 +1,24 @@
 use crate::lexic::token::Token;
 
-use super::{ast::statement::Statement, functions::function_call, ParseResult};
+use super::{ast::statement::Statement, functions::function_call, ParseResult, binding};
 
 pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Statement, ()> {
-    None.or_else(|| match function_call::try_parse(tokens, pos) {
-        ParseResult::Ok(f, next) => Some(ParseResult::Ok(Statement::FunctionCall(f), next)),
-        ParseResult::Err(err) => Some(ParseResult::Err(err)),
-        _ => None,
-    })
-    .unwrap_or_else(|| ParseResult::Unmatched)
+    None
+        .or_else(
+            || match binding::try_parse(tokens, pos) {
+                ParseResult::Ok(b, next) => Some(ParseResult::Ok(Statement::Binding(b), next)),
+                ParseResult::Err(err) => Some(ParseResult::Err(err)),
+                _ => None,
+            }
+        )
+        .or_else(|| match function_call::try_parse(tokens, pos) {
+            ParseResult::Ok(f, next) => Some(ParseResult::Ok(Statement::FunctionCall(f), next)),
+            ParseResult::Err(err) => Some(ParseResult::Err(err)),
+            _ => None,
+        })
+        .unwrap_or_else(|| ParseResult::Unmatched)
 }
 
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -24,7 +31,7 @@ mod tests {
 
         let statement = match statement {
             ParseResult::Ok(s, _) => s,
-            _ => panic!("Expected a function call"),
+            _ => panic!("Expected a statement"),
         };
 
         match statement {
@@ -32,4 +39,22 @@ mod tests {
             _ => panic!("Expected a function call"),
         }
     }
+
+
+    #[test]
+    fn should_parse_binding() {
+        let input = String::from("val identifier = 20");
+        let tokens = crate::lexic::get_tokens(&input).unwrap();
+        let statement = try_parse(&tokens, 0);
+
+        let statement = match statement {
+            ParseResult::Ok(s, _) => s,
+            _ => panic!("Expected a statement"),
+        };
+
+        match statement {
+            Statement::Binding(_) => assert!(true),
+            _ => panic!("Expected a binding"),
+        }
+    }
 }

src/syntax/utils.rs

@@ -1,5 +1,4 @@
 use crate::{
-    error_handling::SyntaxError,
     lexic::token::{Token, TokenType},
     utils::Result3,
 };