breaking up parser file into smaller ones

parser/parser.go

@@ -1,8 +1,6 @@
 package parser
 
 import (
-	"fmt"
-
 	"github.com/54L1m/mil-lang/ast"
 	"github.com/54L1m/mil-lang/lexer"
 	"github.com/54L1m/mil-lang/token"
@@ -28,21 +26,6 @@ func New(l *lexer.Lexer) *Parser {
 	return p
 }
 
-func (p *Parser) Errors() []string {
-	return p.errors
-}
-
-func (p *Parser) peekError(t token.TokenType) {
-	msg := fmt.Sprintf("expected next token to be %s, got %s instead",
-		t, p.peekToken.Type)
-	p.errors = append(p.errors, msg)
-}
-
-func (p *Parser) nextToken() {
-	p.curToken = p.peekToken
-	p.peekToken = p.l.NextToken()
-}
-
 func (p *Parser) ParseProgram() *ast.Program {
 	program := &ast.Program{}
 	program.Statements = []ast.Statement{}
@@ -57,6 +40,7 @@ func (p *Parser) ParseProgram() *ast.Program {
 	return program
 }
 
+// parsing statements
 func (p *Parser) parseStatement() ast.Statement {
 	switch p.curToken.Type {
 	case token.VAR:
@@ -67,6 +51,7 @@ func (p *Parser) parseStatement() ast.Statement {
 	}
 }
 
+// parsing var statements
 func (p *Parser) parseVarStatement() *ast.VarStatement {
 	stmt := &ast.VarStatement{Token: p.curToken}
 
@@ -88,21 +73,3 @@ func (p *Parser) parseVarStatement() *ast.VarStatement {
 
 	return stmt
 }
-
-func (p *Parser) curTokenIs(t token.TokenType) bool {
-	return p.curToken.Type == t
-}
-
-func (p *Parser) peekTokenIs(t token.TokenType) bool {
-	return p.peekToken.Type == t
-}
-
-func (p *Parser) expectPeek(t token.TokenType) bool {
-	if p.peekTokenIs(t) {
-		p.nextToken()
-		return true
-	} else {
-		p.peekError(t)
-		return false
-	}
-}

parser/parser_errors.go

@@ -0,0 +1,17 @@
+package parser
+
+import (
+	"fmt"
+
+	"github.com/54L1m/mil-lang/token"
+)
+
+func (p *Parser) Errors() []string {
+	return p.errors
+}
+
+func (p *Parser) peekError(t token.TokenType) {
+	msg := fmt.Sprintf("expected next token to be %s, got %s instead",
+		t, p.peekToken.Type)
+	p.errors = append(p.errors, msg)
+}

parser/parser_helpers.go

@@ -0,0 +1,26 @@
+package parser
+
+import "github.com/54L1m/mil-lang/token"
+
+func (p *Parser) nextToken() {
+	p.curToken = p.peekToken
+	p.peekToken = p.l.NextToken()
+}
+
+func (p *Parser) curTokenIs(t token.TokenType) bool {
+	return p.curToken.Type == t
+}
+
+func (p *Parser) peekTokenIs(t token.TokenType) bool {
+	return p.peekToken.Type == t
+}
+
+func (p *Parser) expectPeek(t token.TokenType) bool {
+	if p.peekTokenIs(t) {
+		p.nextToken()
+		return true
+	} else {
+		p.peekError(t)
+		return false
+	}
+}