Lexer tokens are now created by the lexer

This is so positional information can be accurately embedded into them.

file/file.go

@@ -103,11 +103,11 @@ func (file *File) Close () {
 
 // Location returns a location struct describing the current position inside of
 // the file. This can be stored and used to print errors.
-func (file *File) Location () (location Location) {
+func (file *File) Location (width int) (location Location) {
 	return Location {
 		file:   file,
 		row:    file.currentLine,
 		column: file.currentColumn,
-		width:  1,
+		width:  width,
 	}
 }

lexer/lexer.go

@@ -35,7 +35,7 @@ func (lexer *LexingOperation) tokenize () (err error) {
 		
 		if err != nil || shebangCheck[index] != lexer.char {
 			err = file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"not an arf file",
 				file.ErrorKindError)
 			return
@@ -66,13 +66,18 @@ func (lexer *LexingOperation) tokenize () (err error) {
 	}
 
 	if lexer.tokens[len(lexer.tokens) - 1].kind != TokenKindNewline {
-		lexer.addToken(Token { kind: TokenKindNewline })
+		token := lexer.newToken()
+		token.kind = TokenKindNewline
+		lexer.addToken(token)
 	}
 
 	return
 }
 
 func (lexer *LexingOperation) tokenizeAlphaBeginning () (err error) {
+	token := lexer.newToken()
+	token.kind = TokenKindName
+
 	got := ""
 
 	for {
@@ -86,7 +91,7 @@ func (lexer *LexingOperation) tokenizeAlphaBeginning () (err error) {
 		lexer.nextRune()
 	}
 
-	token := Token { kind: TokenKindName, value: got }
+	token.value = got
 
 	if len(got) == 2 {
 		firstValid  := got[0] == 'n' || got[0] == 'r' || got[0] == 'w'
@@ -119,11 +124,14 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 			err = lexer.nextRune()
 			
 			file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"tab not used as indent",
 				file.ErrorKindWarn).Print()
 			return
 		}
+		
+		token := lexer.newToken()
+		token.kind = TokenKindIndent
 
 		// eat up tabs while increasing the indent level
 		indentLevel := 0		
@@ -132,11 +140,9 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 			err = lexer.nextRune()
 			if err != nil { return }
 		}
-		
+
-		lexer.addToken (Token {
+		token.value = indentLevel
-			kind: TokenKindIndent,
+		lexer.addToken(token)
-			value: indentLevel,
-		})
 	case '\n':
 		// line break
 
@@ -155,48 +161,49 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 			lexer.tokens = lexer.tokens[:tokenIndex]
 		}
 		
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindNewline,
+		token.kind = TokenKindNewline
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '"':
 		err = lexer.tokenizeString(false)
 	case '\'':
 		err = lexer.tokenizeString(true)
 	case ':':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindColon,
+		token.kind = TokenKindColon
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '.':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindDot,
+		token.kind = TokenKindDot
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '[':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindLBracket,
+		token.kind = TokenKindLBracket
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case ']':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindRBracket,
+		token.kind = TokenKindRBracket
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '{':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindLBrace,
+		token.kind = TokenKindLBrace
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '}':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindRBrace,
+		token.kind = TokenKindRBrace
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '+':
 		err = lexer.nextRune()
 		if err != nil { return }
-		token := Token { kind: TokenKindPlus }
+		token := lexer.newToken()
+		token.kind = TokenKindPlus
 		if lexer.char == '+' {
 			token.kind = TokenKindIncrement
 		}
@@ -205,39 +212,40 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 	case '-':
 		err = lexer.tokenizeDashBeginning()
 	case '*':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindAsterisk,
+		token.kind = TokenKindAsterisk
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '/':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindSlash,
+		token.kind = TokenKindSlash
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '@':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindAt,
+		token.kind = TokenKindAt
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '!':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindExclamation,
+		token.kind = TokenKindExclamation
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '%':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindPercent,
+		token.kind = TokenKindPercent
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '~':
-		lexer.addToken (Token {
+		token := lexer.newToken()
-			kind: TokenKindTilde,
+		token.kind = TokenKindTilde
-		})
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '<':
 		err = lexer.nextRune()
 		if err != nil { return }
-		token := Token { kind: TokenKindLessThan }
+		token := lexer.newToken()
+		token.kind = TokenKindLessThan
 		if lexer.char == '<' {
 			token.kind = TokenKindLShift
 		}
@@ -246,7 +254,8 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 	case '>':
 		err = lexer.nextRune()
 		if err != nil { return }
-		token := Token { kind: TokenKindGreaterThan }
+		token := lexer.newToken()
+		token.kind = TokenKindGreaterThan
 		if lexer.char == '>' {
 			token.kind = TokenKindRShift
 		}
@@ -255,7 +264,8 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 	case '|':
 		err = lexer.nextRune()
 		if err != nil { return }
-		token := Token { kind: TokenKindBinaryOr }
+		token := lexer.newToken()
+		token.kind = TokenKindBinaryOr
 		if lexer.char == '|' {
 			token.kind = TokenKindLogicalOr
 		}
@@ -264,7 +274,8 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 	case '&':
 		err = lexer.nextRune()
 		if err != nil { return }
-		token := Token { kind: TokenKindBinaryAnd }
+		token := lexer.newToken()
+		token.kind = TokenKindBinaryAnd
 		if lexer.char == '&' {
 			token.kind = TokenKindLogicalAnd
 		}
@@ -272,7 +283,7 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		err = lexer.nextRune()
 	default:
 		err = file.NewError (
-			lexer.file.Location(),
+			lexer.file.Location(1),
 			"unexpected symbol character " +
 			string(lexer.char),
 			file.ErrorKindError)
@@ -287,7 +298,8 @@ func (lexer *LexingOperation) tokenizeDashBeginning () (err error) {
 	if err != nil { return }
 
 	if lexer.char == '-' {
-		token := Token { kind: TokenKindDecrement }
+		token := lexer.newToken()
+		token.kind = TokenKindDecrement
 
 		err = lexer.nextRune()
 		if err != nil { return }
@@ -298,7 +310,8 @@ func (lexer *LexingOperation) tokenizeDashBeginning () (err error) {
 		}
 		lexer.addToken(token)
 	} else if lexer.char == '>' {
-		token := Token { kind: TokenKindReturnDirection }
+		token := lexer.newToken()
+		token.kind = TokenKindReturnDirection
 
 		err = lexer.nextRune() 
 		if err != nil { return }
@@ -307,13 +320,19 @@ func (lexer *LexingOperation) tokenizeDashBeginning () (err error) {
 	} else if lexer.char >= '0' && lexer.char <= '9' {
 		lexer.tokenizeNumberBeginning(true)
 	} else {
-		token := Token { kind: TokenKindMinus }
+		token := lexer.newToken()
+		token.kind = TokenKindMinus
 		lexer.addToken(token)
 	}
 	
 	return
 }
 
+// newToken creates a new token from the lexer's current position in the file.
+func (lexer *LexingOperation) newToken () (token Token) {
+	return Token { location: lexer.file.Location(1) }
+}
+
 // addToken adds a new token to the lexer's token slice.
 func (lexer *LexingOperation) addToken (token Token) {
 	lexer.tokens = append(lexer.tokens, token)
@@ -334,7 +353,7 @@ func (lexer *LexingOperation) nextRune () (err error) {
 	lexer.char, _, err = lexer.file.ReadRune()
 	if err != nil && err != io.EOF {
 		return file.NewError (
-			lexer.file.Location(),
+			lexer.file.Location(1),
 			err.Error(), file.ErrorKindError)
 	}
 	return

lexer/numbers.go

@@ -8,6 +8,8 @@ func (lexer *LexingOperation) tokenizeNumberBeginning (negative bool) (err error
 	var fragment float64
 	var isFloat  bool
 
+	token := lexer.newToken()
+
 	if lexer.char == '0' {
 		lexer.nextRune()
 
@@ -23,7 +25,7 @@ func (lexer *LexingOperation) tokenizeNumberBeginning (negative bool) (err error
 			number, fragment, isFloat, err = lexer.tokenizeNumber(8)
 		} else {
 			return file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"unexpected character in number literal",
 				file.ErrorKindError)
 		}
@@ -33,8 +35,6 @@ func (lexer *LexingOperation) tokenizeNumberBeginning (negative bool) (err error
 
 	if err != nil { return }
 
-	token := Token { }
-
 	if isFloat {
 		floatNumber := float64(number) + fragment
 	

lexer/text.go

@@ -8,6 +8,8 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 	err = lexer.nextRune()
 	if err != nil { return }
 
+	token := lexer.newToken()
+
 	got := ""
 
 	for {
@@ -38,12 +40,10 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 	err = lexer.nextRune()
 	if err != nil { return }
 
-	token := Token { }
-
 	if isRuneLiteral {
 		if len(got) > 1 {
 			err = file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"excess data in rune literal",
 				file.ErrorKindError)
 			return
@@ -99,7 +99,7 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                 
                 if len(number) < 3 {
 			err = file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"octal escape sequence too short",
 				file.ErrorKindError)
 			return
@@ -133,7 +133,7 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                 
                 if len(number) < want {
 			err = file.NewError (
-				lexer.file.Location(),
+				lexer.file.Location(1),
 				"hex escape sequence too short ",
 				file.ErrorKindError)
 			return
@@ -143,7 +143,7 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                 result = rune(parsedNumber)
 	} else {
 		err = file.NewError (
-			lexer.file.Location(),
+			lexer.file.Location(1),
 			"unknown escape character " +
 			string(lexer.char), file.ErrorKindError)
 		return

lexer/token.go

@@ -78,7 +78,7 @@ func (token Token) Value () (value any) {
 
 // Equals returns whether this token is equal to another token
 func (token Token) Equals (testToken Token) (match bool) {
-	return token == testToken
+	return token.value == testToken.value && token.Is(testToken.kind)
 } 
 
 // Location returns the location of the token in its file.