start parser

Author: 54L1M

ast/ast.go

@@ -1,5 +1,9 @@
 package ast
 
+import (
+	"github.com/54L1m/mil-lang/token"
+)
+
 type Node interface {
 	TokenLiteral() string
 }
@@ -13,3 +17,36 @@ type Expression interface {
 	Node
 	expressionNode()
 }
+
+type Program struct {
+	Statements []Statement
+}
+
+func (p *Program) TokenLiteral() string {
+	if len(p.Statements) > 0 {
+		return p.Statements[0].TokenLiteral()
+	} else {
+		return ""
+	}
+}
+
+type Identifier struct {
+	Token token.Token
+	Value string
+}
+
+func (i *Identifier) expressionNode() {}
+func (i *Identifier) TokenLiteral() string {
+	return i.Token.Literal
+}
+
+type LetStatement struct {
+	Token token.Token
+	Name  *Identifier
+	Value Expression
+}
+
+func (ls *LetStatement) statementNode() {}
+func (ls *LetStatement) TokenLiteral() string {
+	return ls.Token.Literal
+}

parser/parser.go

@@ -0,0 +1,31 @@
+package parser
+
+import (
+	"github.com/54L1m/mil-lang/ast"
+	"github.com/54L1m/mil-lang/lexer"
+	"github.com/54L1m/mil-lang/token"
+)
+
+type Parser struct {
+	l *lexer.Lexer
+
+	curToken  token.Token
+	peekToken token.Token
+}
+
+func New(l *lexer.Lexer) *Parser {
+	p := &Parser{l: l}
+
+	p.nextToken()
+	p.nextToken()
+	return p
+}
+
+func (p *Parser) nextToken() {
+	p.curToken = p.peekToken
+	p.peekToken = p.l.NextToken()
+}
+
+func (p *Parser) ParseProgram() *ast.Program {
+	return nil
+}