feat(lexer): adds skeleton for lexical analyser

main.go

@@ -1,28 +1,41 @@
 package main
 
+// import "github.com/lukepeterson/go8080assembler/assembler"
 import (
 	"fmt"
-	"log"
 
-	"github.com/lukepeterson/go8080assembler/assembler"
+	"github.com/lukepeterson/go8080assembler/pkg/lexer"
 )
 
 func main() {
-	code := `
-		MVI A, 34h
-		MOV B, C
-		LDA, 1234h
-		HLT
-	`
-
-	assembler := assembler.New()
-
-	err := assembler.Assemble(code)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	for _, instruction := range assembler.ByteCode {
-		fmt.Printf("%02X ", instruction)
-	}
+	// code := `
+	// 	MVI A, 34h
+	// 	MOV B, C
+	// 	LDA, 1234h
+	// 	HLT
+	// `
+
+	// assembler := assembler.New()
+
+	// err := assembler.Assemble(code)
+	// if err != nil {
+	// 	log.Fatal(err)
+	// }
+
+	// for _, instruction := range assembler.ByteCode {
+	// 	fmt.Printf("%02X ", instruction)
+	// }
+
+	input := `
+			MVI A, 0x33
+	TEST:	MOV B, C   ; The first comment
+			LDA, 1234h ; The second comment
+			JMP TEST
+
+		; The Third comment with a colon ; here
+			`
+
+	myLexer := lexer.New(input)
+	fmt.Printf("myLexer: %v\n", myLexer)
+
 }

pkg/lexer/lexer.go

@@ -0,0 +1,34 @@
+package lexer
+
+type TokenType string
+
+const (
+	COMMA TokenType = "COMMA"
+	COLON TokenType = "COLON"
+
+	IDENT    TokenType = "IDENT"
+	NUMBER   TokenType = "NUMBER"
+	REGISTER TokenType = "REGISTER"
+	MNEMONIC TokenType = "MNEMONIC"
+
+	COMMENT TokenType = "COMMENT"
+	EOF     TokenType = "EOF"
+
+	UNKNOWN TokenType = "UNKNOWN"
+)
+
+type Token struct {
+	Type    TokenType
+	Literal string
+}
+
+type Lexer struct {
+	input string
+	// position int
+}
+
+func New(input string) *Lexer {
+	lexer := &Lexer{input: input}
+	// lexer.readChar()
+	return lexer
+}