basic One2C code gen

.gitignore

@@ -6,6 +6,8 @@ onev
 *.so
 *.dylib
 *.dll
+*.c
+*.one
 
 # Ignore binary output folders
 bin/

generator.v

@@ -0,0 +1,132 @@
+module main
+
+import strings
+import os
+
+struct Generator {
+mut:
+	out strings.Builder
+}
+
+fn (mut g Generator) get_c_type(typ string) string {
+	c_type := if typ == 'real' { 'double' } else { typ }
+	return c_type
+}
+
+fn (mut g Generator) gen_stmt(stmt Stmt) {
+	match stmt {
+		VarDecl {
+			c_type := g.get_c_type(stmt.type)
+			g.out.write_string('${c_type} ${stmt.name} = ')
+			g.gen_expr(stmt.value)
+			g.out.writeln(';')
+		}
+		ExprStmt {
+			g.gen_expr(stmt.expr)
+			g.out.writeln(';')
+		}
+		ReturnStmt {
+			g.out.write_string('return ')
+			g.gen_expr(stmt.expr)
+			g.out.writeln(';')
+		}
+		Block {
+			g.out.writeln('{')
+			for inner_stmt in stmt.stmts {
+				g.gen_stmt(inner_stmt)
+			}
+			g.out.writeln('}')
+		}
+		FuncDecl {
+			c_type := g.get_c_type(stmt.ret_type)
+			g.out.write_string('${c_type} ${stmt.name}() ')
+			g.gen_stmt(stmt.block)
+		}
+	}
+}
+
+fn (mut g Generator) gen_expr(expr Expr) {
+	match expr {
+		RealLiteral {
+			g.out.write_string(expr.val.str())
+		}
+		IntegerLiteral {
+			g.out.write_string(expr.val.str())
+		}
+		BoolLiteral {
+			g.out.write_string(expr.val.str())
+		}
+		Variable {
+			g.out.write_string(expr.name)
+		}
+		UnaryExpr {
+			// Handle postfix/prefix logic if necessary
+			g.out.write_string('${expr.ident}${expr.op}')
+		}
+		BinaryExpr {
+			g.out.write_string('(')
+			g.gen_expr(expr.left)
+			g.out.write_string(' ${expr.op} ')
+			g.gen_expr(expr.right)
+			g.out.write_string(')')
+		}
+		PrintExpr {
+			g.out.write_string('printf(\"%')
+			format := match expr.type {
+				'int'  {'d'}
+				'real' {'lf'}
+				'bool' {'d'}
+				else   {panic("Tried printing illegal type")}
+			}
+			g.out.write_string('${format}\\n\", ')
+			g.gen_expr(expr.expr)
+			g.out.write_string(')')
+		}
+		TypeCast {
+			c_type := g.get_c_type(expr.type)
+			g.out.write_string('(${c_type})')
+			g.gen_expr(expr.expr)
+		}
+		else {panic('unimplemented ${expr}')}
+	}
+}
+
+fn (mut g Generator) gen_c(program []Stmt) string {
+	g.out.writeln('#include <stdio.h>')
+	g.out.writeln('#include <stdbool.h>') // For your 'bool' types [cite: 4]
+	for stmt in program {
+		g.gen_stmt(stmt)
+	}
+
+	return g.out.str()
+
+}
+
+fn compile_with_clang(c_code string, output_name string, keep_c bool) {
+    // 1. Write the C code to a temporary file
+    c_file := 'middle_c.c'
+    os.write_file(c_file, c_code) or {
+        eprintln('Failed to write C file: $err')
+        return
+    }
+
+    // 2. Construct the clang command
+    // We'll use -O2 for optimization and -o to specify the output binary
+    clang_cmd := 'clang ${c_file} -o ${output_name} -O2'
+
+    println('Executing: ${clang_cmd}')
+
+    // 3. Run the command
+    result := os.execute(clang_cmd)
+
+    if result.exit_code != 0 {
+        eprintln('Clang Compilation Failed:')
+        eprintln(result.output)
+    } else {
+        println('Compilation successful! Binary created: $output_name')
+        // Optional: Remove the temporary C file
+				if !keep_c {
+        	os.rm(c_file) or { }
+				}
+    }
+}

lexer.v

@@ -11,6 +11,7 @@ enum TokenType as u8 {
 	kw_break
 	kw_fn
 	kw_return
+	kw_print
 	integer
 	real
 	boolean
@@ -99,6 +100,7 @@ fn toktype_from_kw(kw string) TokenType {
 		'fn' {.kw_fn}
 		'return' {.kw_return}
 		'true', 'false' {.boolean}
+		'print' {.kw_print}
 		else {.unknown}
 	}
 }
@@ -114,7 +116,7 @@ fn is_real(str string) bool {
 
 fn is_keyword(str string) bool {
 	return [
-		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return", "let", "true", "false"
+		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return", "let", "true", "false", "print"
 	].contains(str)
 }
 

main.v

@@ -1,9 +1,10 @@
 module main
 
 import os
+import strings
 
 fn main() {
-	content := os.read_file("test.one") or { return }
+	content := os.read_file("source.one") or { return }
 	println("---------\n" + content + "---------")
 	tokens := lex(content) or { return }
 	println("-- TOK --")
@@ -17,4 +18,15 @@ fn main() {
 
 	println("-- AST --")
 	println(statements)
+
+	mut generator := Generator{
+		out: strings.new_builder(100)
+	}
+
+	out_c := generator.gen_c(statements)
+
+	println("--- C ---")
+	println(out_c)
+	compile_with_clang(out_c, 'test', true)
+
 }

parser.v

@@ -2,6 +2,28 @@ module main
 
 import term
 
+// ------------------------------------------- Precedence
+
+enum Precedence {
+    lowest
+    assignment // = , +=, -=
+    comparison // ==, !=, <, >
+    sum        // +, -
+    product    // *, /
+    prefix     // -x, !x
+    call       // function()
+}
+
+fn (p Parser) get_precedence(tok_type TokenType) Precedence {
+    return match tok_type {
+        .equals, .plus_eq, .minus_eq, .star_eq, .slash_eq { .assignment }
+        .eq_eq, .not_eq, .less_eq, .greater_eq           { .comparison }
+        .plus, .minus                                    { .sum }
+        .star, .slash                                    { .product }
+        else                                             { .lowest }
+    }
+}
+
 // ------------------------------------------- Symbol Table
 
 type SymbolInfo = VarSymbolInfo | FuncSymbolInfo
@@ -70,7 +92,7 @@ fn (mut s SymbolTable) is_in_global_scope() bool {
 
 // ------------------------------------------- Expressions
 
-type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr
+type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr | PrintExpr
 
 struct VoidExpr {}
 
@@ -118,6 +140,11 @@ struct ParenExpr {
 	expr Expr
 }
 
+struct PrintExpr {
+	expr Expr
+	type string
+}
+
 // ------------------------------------------- Statements
 
 type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl
@@ -139,7 +166,7 @@ struct ExprStmt {
 }
 
 struct ReturnStmt {
-	value Expr
+	expr Expr
 }
 
 struct Block {
@@ -210,20 +237,20 @@ fn (mut p Parser) parse_primary() Expr {
 		.identifier {p.parse_ident(token.text)}
 		.type       {p.parse_type(token.text)}
 		.lparen     {p.parse_paren()}
+		.kw_print   {p.parse_print()}
 		else {parse_error("Unexpected Token")}
 	}
 }
 
-fn (mut p Parser) parse_expr() Expr {
-	mut left := p.parse_primary()
+fn (mut p Parser) parse_expr(prec Precedence) Expr {
+	mut expr := p.parse_primary()
 
-	match p.peek().type {
-		.plus, .minus, .star, .slash, .equals, .eq_eq, .not_eq, .less_eq, .greater_eq,
-		.plus_eq, .minus_eq, .star_eq, .slash_eq {
-			return p.parse_binary(left, p.peek().text)
-		}
-		else {return left}
+	for int(prec) < int(p.get_precedence(p.peek().type)) {
+		op_tok := p.next()
+		expr = p.parse_binary(expr, op_tok.text, p.get_precedence(op_tok.type))
 	}
+
+	return expr
 }
 
 fn (mut p Parser) parse_ident(ident string) Expr {
@@ -233,10 +260,19 @@ fn (mut p Parser) parse_ident(ident string) Expr {
 	}
 }
 
-fn (mut p Parser) parse_binary(left Expr, op string) BinaryExpr {
-	p.next()
-	right := p.parse_expr()
+fn (mut p Parser) parse_print() PrintExpr {
+	p.expect(.lparen)
+	expr := p.parse_expr(.lowest)
+	p.expect(.rparen)
+	return PrintExpr{expr: expr, type: p.get_expr_type(expr)}
+}
+
+fn (mut p Parser) parse_binary(left Expr, op string, prec Precedence) BinaryExpr {
+	//p.next()
+	right := p.parse_expr(prec)
 	binary_expr := BinaryExpr{left, op, right}
+
+
 	if !p.is_op_valid_for_type(p.get_expr_type(left), op) {
 		parse_error("Illegal operation ${op} for type ${p.get_expr_type(left)}")
 	}
@@ -248,7 +284,7 @@ fn (mut p Parser) parse_type(type string) Expr {
 
 	if p.peek().type == .lparen {
 		p.next()
-		expr := p.parse_expr()
+		expr := p.parse_expr(.lowest)
 		p.expect(.rparen)
 
 		return TypeCast {
@@ -261,7 +297,7 @@ fn (mut p Parser) parse_type(type string) Expr {
 }
 
 fn (mut p Parser) parse_paren() ParenExpr {
-	expr := p.parse_expr()
+	expr := p.parse_expr(.lowest)
 	p.expect(.rparen)
 	return ParenExpr{expr: expr}
 }
@@ -356,7 +392,7 @@ fn (mut p Parser) parse_var_decl() VarDecl {
 	}
 
 	p.expect(.equals)
-	val := p.parse_expr()
+	val := p.parse_expr(.lowest)
 
 	if type_tok.text == 'void' {
 		parse_error("Cannot declare a variable of type void")
@@ -402,9 +438,9 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 	return_stmts := p.get_return_stmts_recursive(block)
 
 	for return_stmt in return_stmts {
-		if p.get_expr_type(return_stmt.value) != type_tok.text {
+		if p.get_expr_type(return_stmt.expr) != type_tok.text {
 			parse_error("Mismatch between declared return type (${type_tok.text}) \
-			and actual return type (${p.get_expr_type(return_stmt.value)})")
+			and actual return type (${p.get_expr_type(return_stmt.expr)})")
 		}
 	}
 
@@ -437,12 +473,12 @@ fn (mut p Parser) parse_return_stmt() ReturnStmt {
 		p.expect(.semicolon)
 	}
 	return ReturnStmt {
-		value: expr
+		expr: expr
 	}
 }
 
 fn (mut p Parser) parse_expr_stmt() ExprStmt {
-	expr := p.parse_expr()
+	expr := p.parse_expr(.lowest)
 	p.expect(.semicolon)
 
 	return ExprStmt {

test.one

@@ -1,3 +0,0 @@
-let a int = 2;
-a++;
-a *= 3.6 + 1.1;