Add declaration parsing

ast.odin

@@ -25,6 +25,7 @@ NodeKind :: enum {
 	Use,
 
 	If,
+	VariableDeclaration,
 }
 
 Node :: struct {
@@ -116,6 +117,7 @@ node_print :: proc(node: ^Node, indent := 0) {
 	}
 	if node == nil {
 		fmt.println("nil")
+		return
 	}
 
 	fmt.printf("{}: {} ", node.kind, "TODO")
@@ -195,3 +197,21 @@ node_create_if :: proc(range: TextRange, condition, then, else_: ^Node) -> (ret:
 	return
 }
 
+node_create_variable :: proc(range: TextRange, name, type_, value: ^Node, is_const: bool) -> (ret: ^Node) {
+	fmt.printf("Creating variable declaration for {} with value {}\n", name.value.([dynamic]u8), value)
+	ret = new(Node)
+	ret^ = {
+		kind = .VariableDeclaration,
+		range = range,
+		children = { name, type_, value },
+		value = is_const,
+	}
+
+	//if value != nil {
+	//	fmt.printf("Appending value to variable declaration\n")
+	//	append(&ret.children, value)
+	//}
+
+	return
+}
+

lexer.odin

@@ -181,6 +181,7 @@ lexer_next :: proc(lexer: ^Lexer) -> (ret: Token) {
 	case '?': ret = token_create(.Question, crange)
 	case ':': ret = token_create(.Colon, crange)
 	case '.': ret = token_create(.Dot, crange)
+	case ',': ret = token_create(.Comma, crange)
 	case ';': ret = token_create(.Semicolon, crange)
 
 	case '"': ret = lexer_read_string(lexer, .String, '\"')
@@ -276,6 +277,7 @@ lexer_read_identifier :: proc(lexer: ^Lexer) -> Token {
 	else if compare_dyn_arr_string(&str, "ret") { return token_create(.Ret, crange) }
 	else if compare_dyn_arr_string(&str, "static") { return token_create(.Static, crange) }
 	else if compare_dyn_arr_string(&str, "defer") { return token_create(.Defer, crange) }
+	else if compare_dyn_arr_string(&str, "let") { return token_create(.Let, crange) }
 	else if compare_dyn_arr_string(&str, "and") { return token_create(.And, crange) }
 	else if compare_dyn_arr_string(&str, "or") { return token_create(.Or, crange) }
 

parser.odin

@@ -53,11 +53,19 @@ parser_parse_block :: proc(parser: ^Parser, end: TokenKind) -> (ret: ^Node) {
 	range := parser.tok.range
 	statements : [dynamic]^Node
 	for parser.tok.kind != end && parser.tok.kind != .EOF {
+		if accept(parser, .Let) {
+			ret := parser_parse_definitions(parser)
+			expect(parser, .Semicolon)
+			for stmt in ret {
+				append(&statements, stmt)
+			}
+		} else {
 			stmt := parser_parse_statement(parser)
 			if stmt != nil {
 				append(&statements, stmt)
 			}
 		}
+	}
 	expect(parser, end)
 	return node_create_block(range, statements)
 }
@@ -80,6 +88,76 @@ parser_parse_statement :: proc(parser: ^Parser) -> (ret: ^Node) {
 	return
 }
 
+@(private = "file")
+parser_parse_type :: proc(parser: ^Parser) -> (ret: ^Node) {
+	// FIXME: Add more types
+	range := parser.tok.range
+	if parser.tok.kind == .Identifier {
+		ret = node_create_value(.Identifier, range, parser.tok.value.([dynamic]u8))
+		parser_next(parser)
+	} else {
+		append(&g_message_list, message_create(
+			.Error,
+			fmt.aprintf("Expected type, got {} at {}", parser.tok.kind, "TODO"),
+			parser.tok.range))
+		ret = nil
+	}
+	return
+}
+
+@(private = "file")
+parser_parse_definitions :: proc(parser: ^Parser, end := TokenKind.Semicolon) -> [dynamic]^Node {
+	range := parser.tok.range
+	vars : [dynamic]^Node
+	type : ^Node = nil
+	are_constants := false
+	uninitialized := false
+	for parser.tok.kind != end && parser.tok.kind != .EOF {
+		names := [dynamic][dynamic]u8{}
+		for parser.tok.kind == .Identifier {
+			tok := parser.tok
+			if !expect(parser, .Identifier) {
+				break
+			}
+
+			append(&names, tok.value.([dynamic]u8))
+		}
+
+		expect(parser, .Colon)
+
+		if parser.tok.kind != .Colon && parser.tok.kind != .Assign {
+			type = parser_parse_type(parser)
+		}
+
+		if accept(parser, .Assign) {
+			are_constants = false
+		} else if accept(parser, .Colon) {
+			are_constants = true
+		} else {
+			uninitialized = true
+		}
+
+		for i in 0..<len(names) {
+			value : ^Node = nil
+			if uninitialized == false {
+				value = parser_parse_expression(parser)
+			}
+			fmt.printf("value: {}\n", value)
+			name_node := node_create_value(.Identifier, range, names[i])
+			append(&vars, node_create_variable(range, name_node, type, value, are_constants))
+		}
+
+		if !accept(parser, .Comma) {
+			break
+		}
+
+		type = nil
+		are_constants = false
+		uninitialized = false
+	}
+	return vars
+}
+
 @(private = "file")
 parser_parse_use_statement :: proc(parser: ^Parser) -> ^Node {
 	range := parser.tok.range

test.cat

@@ -4,6 +4,11 @@ use lib "directory/long_library_name"
 fmt.printf "%d + %d = %d File length: %d" a b a + b (io.file_size "file.txt")
 fmt.println "Hello world!"
 
+let a := 123
+let uninitialized : u32
+let multiple variables here : u32 = 1 2 3
+let string : str, number : i32
+
 if a == 1 {
 	lol
 } elif b == 2 {

tokens.odin

@@ -19,7 +19,6 @@ TokenKind :: enum {
 	Type,
 	Use,
 	Pub,
-	Let,
 	Mut,
 	As,
 	In,
@@ -34,6 +33,7 @@ TokenKind :: enum {
 	Ret,
 	Static,
 	Defer,
+	Let,
 
 	// Logical Operators Keywords
 	And,
@@ -80,6 +80,7 @@ TokenKind :: enum {
 	Colon,
 	Arrow,
 	Dot,
+	Comma,
 
 	// Other
 	Semicolon,
@@ -96,6 +97,7 @@ TextRange :: struct {
 }
 
 TokenValue :: union {
+	bool,
 	u64,
 	f64,
 	[dynamic]u8,
@@ -140,3 +142,5 @@ token_create_f64 :: proc(kind: TokenKind, value: f64, range: TextRange) -> Token
 	};
 }
 
+
+