feat: Naive transpiling of variable bindings

CHANGELOG.md

@@ -28,6 +28,7 @@
 ## v0.1.1
 
 - [x] Top level expressions as statements
+- [ ] Naively transpile variable bindings
 
 ## v0.1.0
 

Cargo.lock

@@ -92,7 +92,7 @@ dependencies = [
 
 [[package]]
 name = "thp"
-version = "0.0.14"
+version = "0.1.0"
 dependencies = [
  "colored",
  "serde",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "thp"
-version = "0.0.14"
+version = "0.1.0"
 edition = "2021"
 
 

src/codegen/php/expression/mod.rs

@@ -1,2 +1,2 @@
-mod primary_expression;
 mod assignment;
+mod primary_expression;

src/codegen/php/statement_list.rs

@@ -14,7 +14,12 @@ impl Transpilable for PhpAst<'_> {
 
 #[cfg(test)]
 mod tests {
-    use crate::{codegen::Transpilable, php_ast::PhpAst};
+    use crate::{
+        codegen::Transpilable,
+        php_ast::{
+            PhpAssignmentExpression, PhpAst, PhpExpression, PhpPrimaryExpression, PhpStatement,
+        },
+    };
 
     #[test]
     fn should_transpile_empty_file() {
@@ -23,4 +28,19 @@ mod tests {
 
         assert_eq!("<?php\n", output);
     }
+
+    #[test]
+    fn should_transpile_expr_statement() {
+        let value = String::from("Hello world!");
+        let ast = PhpAst {
+            statements: vec![PhpStatement::PhpExpressionStatement(
+                PhpExpression::Assignment(PhpAssignmentExpression::Primary(
+                    PhpPrimaryExpression::StringLiteral(&value),
+                )),
+            )],
+        };
+        let output = ast.transpile();
+
+        assert_eq!("<?php\n\"Hello world!\";", output);
+    }
 }

src/php_ast/transformers/expression.rs

@@ -16,7 +16,74 @@ impl<'a> PHPTransformable<'a> for Expression<'_> {
                 let expr = PhpPrimaryExpression::StringLiteral(value);
                 PhpExpression::Assignment(PhpAssignmentExpression::Primary(expr))
             }
+            Expression::Int(value) => {
+                let expr = PhpPrimaryExpression::IntegerLiteral(value);
+                PhpExpression::Assignment(PhpAssignmentExpression::Primary(expr))
+            }
+            Expression::Float(value) => {
+                let expr = PhpPrimaryExpression::FloatingLiteral(value);
+                PhpExpression::Assignment(PhpAssignmentExpression::Primary(expr))
+            }
             _ => todo!("transformation for expression: {:?}", self),
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        php_ast::{
+            transformers::PHPTransformable, PhpAssignmentExpression, PhpExpression,
+            PhpPrimaryExpression,
+        },
+        syntax::ast::Expression,
+    };
+
+    #[test]
+    fn should_transform_string() {
+        let value = String::from("Hello");
+        let input = Expression::String(&value);
+        let output = input.into_php_ast();
+
+        match output {
+            PhpExpression::Assignment(PhpAssignmentExpression::Primary(
+                PhpPrimaryExpression::StringLiteral(value),
+            )) => {
+                assert_eq!("Hello", value)
+            }
+            _ => panic!("Expected a String literal"),
+        }
+    }
+
+    #[test]
+    fn should_transform_int() {
+        let value = String::from("322");
+        let input = Expression::Int(&value);
+        let output = input.into_php_ast();
+
+        match output {
+            PhpExpression::Assignment(PhpAssignmentExpression::Primary(
+                PhpPrimaryExpression::IntegerLiteral(value),
+            )) => {
+                assert_eq!("322", value)
+            }
+            _ => panic!("Expected a Int literal"),
+        }
+    }
+
+    #[test]
+    fn should_transform_float() {
+        let value = String::from("322.644");
+        let input = Expression::Float(&value);
+        let output = input.into_php_ast();
+
+        match output {
+            PhpExpression::Assignment(PhpAssignmentExpression::Primary(
+                PhpPrimaryExpression::FloatingLiteral(value),
+            )) => {
+                assert_eq!("322.644", value)
+            }
+            _ => panic!("Expected a Float literal"),
+        }
+    }
+}

src/php_ast/transformers/module_ast.rs

@@ -85,3 +85,18 @@ impl<'a> PHPTransformable<'a> for ModuleAST<'_> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{php_ast::transformers::PHPTransformable, syntax::ast::ModuleAST};
+
+    #[test]
+    fn should_transform_empty_ast() {
+        let input = ModuleAST {
+            productions: vec![],
+        };
+        let output = input.into_php_ast();
+
+        assert!(output.statements.is_empty())
+    }
+}

src/php_ast/transformers/statement.rs

@@ -1,5 +1,8 @@
 use super::super::PhpStatement;
-use crate::syntax::ast::Statement;
+use crate::{
+    php_ast::{PhpAssignmentExpression, PhpExpression, PhpSimpleAssignment},
+    syntax::ast::Statement,
+};
 
 use super::PHPTransformable;
 
@@ -9,7 +12,76 @@ impl<'a> PHPTransformable<'a> for Statement<'_> {
 
     fn into_php_ast(&'a self) -> Self::Item {
         match self {
+            Statement::Binding(b) => {
+                // This is a PhpExpression, but a PhpPrimaryExpression is needed
+                let binding_expr = b.expression.into_php_ast();
+
+                // TODO: Somehow fix this...
+                // the function above `into_php_ast` should somehow
+                // return what I need? Or should return something general and
+                // then i decide how to transform it here?
+                // if it reaches this point in the pipeline, is it
+                // safe to assume that any AST is correct, since
+                // semantic analysis (supposedly) did its job?
+                let binding_primary_expr = match binding_expr {
+                    PhpExpression::Assignment(PhpAssignmentExpression::Primary(p)) => p,
+                    _ => unreachable!("Expected a PrimaryExpression during AST transformation"),
+                };
+
+                PhpStatement::PhpExpressionStatement(PhpExpression::Assignment(
+                    PhpAssignmentExpression::SimpleAssignment(PhpSimpleAssignment {
+                        variable: b.identifier.value.clone(),
+                        assignment: binding_primary_expr,
+                    }),
+                ))
+            }
             _ => todo!("transformation for statement: {:?}", self),
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        lexic::token::{Token, TokenType},
+        php_ast::{
+            transformers::PHPTransformable, PhpAssignmentExpression, PhpExpression,
+            PhpPrimaryExpression, PhpStatement,
+        },
+        syntax::ast::{var_binding::VariableBinding, Expression, Statement},
+    };
+
+    #[test]
+    fn should_transform_binding() {
+        let identifier_token = Token {
+            token_type: TokenType::Identifier,
+            value: "name".into(),
+            position: 0,
+        };
+        let expr_value = String::from("Hello");
+        let expression = Expression::String(&expr_value);
+        let binding = Statement::Binding(VariableBinding {
+            datatype: None,
+            identifier: &identifier_token,
+            expression,
+            is_mutable: false,
+        });
+        let output = binding.into_php_ast();
+
+        match output {
+            PhpStatement::PhpExpressionStatement(PhpExpression::Assignment(
+                PhpAssignmentExpression::SimpleAssignment(assignment),
+            )) => {
+                assert_eq!("name", assignment.variable);
+
+                match assignment.assignment {
+                    PhpPrimaryExpression::StringLiteral(value) => {
+                        assert_eq!("Hello", value);
+                    }
+                    _ => panic!("Expected a String literal as the value of the assignment"),
+                }
+            }
+            _ => panic!("Expected an ExpressionStatement"),
+        }
+    }
+}

src/semantic/checks/top_level_declaration.rs

@@ -88,10 +88,10 @@ impl SemanticCheck for Expression<'_> {
                     }
                 }
             }
-            Expression::Int(_) => {},
-            Expression::Float(_) => {},
-            Expression::String(_) => {},
-            Expression::Boolean(_) => {},
+            Expression::Int(_) => {}
+            Expression::Float(_) => {}
+            Expression::String(_) => {}
+            Expression::Boolean(_) => {}
             _ => todo!("Check semantics for expression other than function call and primitive"),
         }