Implement new tokens

I think this is all of them. The test will tell.

README.md

@@ -16,7 +16,7 @@ A directory of ARF files is called a module, and modules will compile to object
 files (one per module) using C as an intermediate language (maybe LLVM IR in the
 future).
 
-## Design aspects
+## Design Aspects
 
 These are some design goals that I have followed/am following:
 
@@ -32,7 +32,7 @@ These are some design goals that I have followed/am following:
 - One line at a time - the language's syntax should encourage writing code that
   flows vertically and not horizontally, with minimal nesting
 
-## Planned features
+## Planned Features
 
 - Type definition through inheritence
 - Struct member functions
@@ -49,3 +49,11 @@ These are some design goals that I have followed/am following:
 - [ ] Semantic tree -> C -> object file
 - [ ] Figure out HOW to implement generics
 - [ ] Create a standard library
+
+## Compiler Progress
+
+<img src="assets/heatmap.png" alt="Progress heatmap" width="400">
+
+- Yellow: needs to be completed for the MVP
+- Lime: ongoing progress in this area
+- Green: Already completed

assets/logo.svg

@@ -1,8 +1,8 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 288 80" width="288" height="80">
-<path d="M48 0L112 0L112 32L96 32L96 16L56 16L40 32L16 32L48 0Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M48 0L112 0L112 32L96 32L96 16L56 16L40 32L16 32L48 0Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
-<path d="M96 64L136 64L136 80L104 80L96 72L96 64Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M96 64L136 64L136 80L104 80L96 72L96 64Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
-<path d="M120 0L120 32L136 32L136 16L184 16L184 32L176 40L8 40L0 48L0 56L184 56L200 40L200 32L200 0L120 0Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M120 0L120 32L136 32L136 16L184 16L184 32L176 40L8 40L0 48L0 56L184 56L200 40L200 32L200 0L120 0Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
-<path d="M191 61L204 48L236 80L210 80L191 61Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M191 61L204 48L236 80L210 80L191 61Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
-<path d="M256 40L208 40L224 56L256 56L256 40Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M256 40L208 40L224 56L256 56L256 40Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
-<path d="M208 0L288 0L288 16L224 16L224 32L208 32L208 0Z" fill="#bf616a" fill-rule="evenodd" opacity="1" stroke="none"/>
+<path d="M208 0L288 0L288 16L224 16L224 32L208 32L208 0Z" fill="#b81414" fill-rule="evenodd" opacity="1" stroke="none"/>
 </svg>

examples/basic/main.arf

@@ -1,3 +1,9 @@
 :arf
+require "io"
+---
 
-func rr main
+func ro main
+	> arguments:{String}
+	< status:Int 0
+	---
+	io.println "hello world"

examples/full/main.arf

@@ -5,35 +5,29 @@ require "io"
 ---
 
 # this is a global variable
-data wn helloText:String "Hello, world!"
+data pv helloText:String "Hello, world!"
 
 # this is a struct definition
-type rr Greeter:Obj
+objt ro Greeter:Obj
-        # "Hi." is a string constant. all Greeters will be initialized with a
+	rw text:String "Hi."
-        # pointer to it. I don't know really it depends on what I decide that
-        # a String type even is.
-        wr text:String "Hi."
-                "sdfdsf" "ahh"
-                "asdf"
 
 # this is a function
-func rr main
+func ro main
-        > argc:Int
+	> arguments:{String}
-        > argv:{String}
 	< status:Int 0
 	---
-        let greeter:Greeter:mut
+	set greeter:Greeter:mut
 	greeter.setText helloText
 	greeter.greet
 
 # this is a member function
-func rr greet
+func ro greet
 	@ greeter:{Greeter}
 	---
 	io.println greeter.text
 
 # this is mutator member function
-func rr setText
+func ro setText
 	@ greeter:{Greeter}
 	> text:String
 	---

examples/tokens/general.arf

@@ -1,11 +0,0 @@
-:arf
-require io
----
-
-func rr main
-	> argc:Int
-	> argv:{String}
-	< status:Int
-	---
-	io.println [io.readln]
-	= status 0

examples/tokens/literals.arf

@@ -1,13 +0,0 @@
-:arf
----
-
-data:{Int 6}
-	-39480 398 29 0x3AFe3 0b10001010110 0o666
-
-func rr literals
-	---
-	= stringLiteral:String "skadjlsakdj"
-	= intArrayLiteral:{Int 3} 2398
-		-2938 324
-	= runeLiteral:Rune 'a'
-	= floatArrayLiteral:{F64 5} 3248.23 0.324 -94.29

face_test.go

@@ -0,0 +1,21 @@
+package parser
+
+import "testing"
+
+func TestFace (test *testing.T) {
+	checkTree ("../tests/parser/face",
+`:arf
+---
+face ro Destroyer:Face
+	destroy
+face ro ReadWriter:Face
+	read
+		> into:{Byte ..}
+		< read:Int
+		< err:Error
+	write
+		> data:{Byte ..}
+		< wrote:Int
+		< err:Error
+`, test)
+}

file/file.go

@@ -8,6 +8,8 @@ type File struct {
 	path          string
 	file          *os.File
 	reader        *bufio.Reader
+	realLine      int
+	realColumn    int
 	currentLine   int
 	currentColumn int
 	lines         []string
@@ -42,6 +44,9 @@ func (file *File) Read (bytes []byte) (amountRead int, err error) {
 
 	// store the character in the file
 	for _, char := range bytes {
+		file.realLine   = file.currentLine		
+		file.realColumn = file.currentColumn
+		
 		if char == '\n' {
 			file.lines = append(file.lines, "")
 			file.currentLine ++
@@ -61,6 +66,9 @@ func (file *File) Read (bytes []byte) (amountRead int, err error) {
 func (file *File) ReadRune () (char rune, size int, err error) {
 	char, size, err = file.reader.ReadRune()
 
+	file.realLine   = file.currentLine		
+	file.realColumn = file.currentColumn
+	
 	if char == '\n' {
 		file.lines = append(file.lines, "")
 		file.currentLine ++
@@ -106,8 +114,18 @@ func (file *File) Close () {
 func (file *File) Location (width int) (location Location) {
 	return Location {
 		file:   file,
-		row:    file.currentLine,
+		row:    file.realLine,
-		column: file.currentColumn,
+		column: file.realColumn,
 		width:  width,
 	}
 }
+
+// Path returns the path that teh file is located at.
+func (file *File) Path () (path string) {
+	return file.path
+}
+
+// GetLine returns the line at the specified index.
+func (file *File) GetLine (index int) (line string) {
+	return file.lines[index]
+}

file/location.go

@@ -1,5 +1,7 @@
 package file
 
+import "fmt"
+
 // Location represents a specific point in a file. It is used for error
 // reporting.
 type Location struct {
@@ -9,11 +11,6 @@ type Location struct {
 	width  int
 }
 
-// NewError creates a new error at this location.
-func (location Location) NewError (message string, kind ErrorKind) (err Error) {
-	return NewError(location, message, kind)
-}
-
 // File returns the file the location is in
 func (location Location) File () (file *File) {
 	return location.file
@@ -36,3 +33,17 @@ func (location Location) Column () (column int) {
 func (location Location) Width () (width int) {
 	return location.width
 }
+
+// SetWidth sets the location's width
+func (location *Location) SetWidth (width int) {
+	location.width = width
+}
+
+// Describe generates a description of the location for debug purposes
+func (location Location) Describe () (description string) {
+	return fmt.Sprint (
+		"in ", location.file.Path(),
+		" row ", location.row,
+		" column ", location.column,
+		" width ", location.width)
+}

infoerr/error.go

@@ -1,7 +1,8 @@
-package file
+package infoerr
 
 import "os"
 import "fmt"
+import "git.tebibyte.media/sashakoshka/arf/file"
 
 type ErrorKind int
 
@@ -11,14 +12,14 @@ const (
 )
 
 type Error struct {
-	Location
+	file.Location 
 	message string
 	kind    ErrorKind
 }
 
 // NewError creates a new error at the specified location.
 func NewError (
-	location Location,
+	location file.Location,
 	message string,
 	kind ErrorKind,
 ) (
@@ -41,24 +42,23 @@ func (err Error) Error () (formattedMessage string) {
 	}
 
 	// print information about the location of the mistake
-	if err.width > 0 {
+	if err.Width() > 0 {
 		formattedMessage += fmt.Sprint (
-			" \033[34m", err.Location.row + 1,
+			" \033[34m", err.Row() + 1,
-			":", err.Location.column + 1)
+			":", err.Column() + 1)
 	}
 	formattedMessage +=
 		" \033[90min\033[0m " +
-		err.Location.file.path + "\n"
+		err.File().Path() + "\n"
 	
-	if err.width > 0 {
+	if err.Width() > 0 {
 		// print erroneous line
-		line := err.Location.file.lines[err.Location.row]
+		line := err.File().GetLine(err.Row())
-		formattedMessage +=
+		formattedMessage += line + "\n"
-			err.Location.file.lines[err.Location.row] + "\n"
 
 		// position error marker
 		var index int
-		for index = 0; index < err.Location.column; index ++ {
+		for index = 0; index < err.Column(); index ++ {
 			if line[index] == '\t' {
 				formattedMessage += "\t"
 			} else {
@@ -67,7 +67,7 @@ func (err Error) Error () (formattedMessage string) {
 		}
 		
 		// print an arrow with a tail spanning the width of the mistake
-		for err.width > 1 {
+		for index < err.Column() + err.Width() - 1 {
 			if line[index] == '\t' {
 				formattedMessage += "--------"
 			} else {

lexer/lexer.go

@@ -3,6 +3,7 @@ package lexer
 import "io"
 import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // LexingOperation holds information about an ongoing lexing operataion.
 type LexingOperation struct {
@@ -34,10 +35,10 @@ func (lexer *LexingOperation) tokenize () (err error) {
 		err = lexer.nextRune()
 		
 		if err != nil || shebangCheck[index] != lexer.char {
-			err = file.NewError (
+			err = infoerr.NewError (
 				lexer.file.Location(1),
 				"not an arf file",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
 		}
 	}
@@ -92,14 +93,14 @@ func (lexer *LexingOperation) tokenizeAlphaBeginning () (err error) {
 	}
 
 	token.value = got
+	token.location.SetWidth(len(got))
 
 	if len(got) == 2 {
-		firstValid  := got[0] == 'n' || got[0] == 'r' || got[0] == 'w'
+		permission, isPermission := types.PermissionFrom(got)
-		secondValid := got[1] == 'n' || got[1] == 'r' || got[1] == 'w'
 		
-		if firstValid && secondValid {
+		if isPermission {
 			token.kind  = TokenKindPermission
-			token.value = types.PermissionFrom(got)
+			token.value = permission
 		}
 	}
 
@@ -123,10 +124,10 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if !previousToken.Is(TokenKindNewline) {
 			err = lexer.nextRune()
 			
-			file.NewError (
+			infoerr.NewError (
 				lexer.file.Location(1),
 				"tab not used as indent",
-				file.ErrorKindWarn).Print()
+				infoerr.ErrorKindWarn).Print()
 			return
 		}
 		
@@ -142,6 +143,7 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		}
 
 		token.value = indentLevel
+		token.location.SetWidth(indentLevel)
 		lexer.addToken(token)
 	case '\n':
 		// line break
@@ -182,6 +184,7 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '.' {
 			token.kind = TokenKindElipsis
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case ',':
@@ -217,6 +220,7 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '+' {
 			token.kind = TokenKindIncrement
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '-':
@@ -238,17 +242,40 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		err = lexer.nextRune()
 	case '!':
 		token := lexer.newToken()
-		token.kind = TokenKindExclamation
-		lexer.addToken(token)
 		err = lexer.nextRune()
+		if err != nil { return }
+		token.kind = TokenKindExclamation
+		if lexer.char == '=' {
+			token.kind = TokenKindNotEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		}
+		lexer.addToken(token)
 	case '%':
 		token := lexer.newToken()
-		token.kind = TokenKindPercent
-		lexer.addToken(token)
 		err = lexer.nextRune()
+		if err != nil { return }
+		token.kind = TokenKindPercent
+		if lexer.char == '=' {
+			token.kind = TokenKindPercentAssignment
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		}
+		lexer.addToken(token)
 	case '~':
 		token := lexer.newToken()
+		err = lexer.nextRune()
+		if err != nil { return }
 		token.kind = TokenKindTilde
+		if lexer.char == '=' {
+			token.kind = TokenKindTildeAssignment
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		}
+		lexer.addToken(token)
+	case '=':
+		token := lexer.newToken()
+		token.kind = TokenKindEqualTo
 		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '<':
@@ -259,6 +286,16 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '<' {
 			token.kind = TokenKindLShift
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
+			if lexer.char == '=' {
+				token.kind = TokenKindLShiftAssignment
+				err = lexer.nextRune()
+				token.location.SetWidth(2)
+			}
+		} else if lexer.char == '=' {
+			token.kind = TokenKindLessThanEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '>':
@@ -269,6 +306,16 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '>' {
 			token.kind = TokenKindRShift
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
+			if lexer.char == '=' {
+				token.kind = TokenKindRShiftAssignment
+				err = lexer.nextRune()
+				token.location.SetWidth(2)
+			}
+		} else if lexer.char == '=' {
+			token.kind = TokenKindGreaterThanEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '|':
@@ -279,6 +326,11 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '|' {
 			token.kind = TokenKindLogicalOr
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		} else if lexer.char == '=' {
+			token.kind = TokenKindBinaryOrAssignment
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '&':
@@ -289,14 +341,19 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		if lexer.char == '&' {
 			token.kind = TokenKindLogicalAnd
 			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		} else if lexer.char == '=' {
+			token.kind = TokenKindBinaryAndAssignment
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	default:
-		err = file.NewError (
+		err = infoerr.NewError (
 			lexer.file.Location(1),
 			"unexpected symbol character " +
 			string(lexer.char),
-			file.ErrorKindError)
+			infoerr.ErrorKindError)
 		return
 	}
 
@@ -310,6 +367,7 @@ func (lexer *LexingOperation) tokenizeDashBeginning () (err error) {
 	if lexer.char == '-' {
 		token := lexer.newToken()
 		token.kind = TokenKindDecrement
+		token.location.SetWidth(2)
 
 		err = lexer.nextRune()
 		if err != nil { return }
@@ -317,11 +375,13 @@ func (lexer *LexingOperation) tokenizeDashBeginning () (err error) {
 		if lexer.char == '-' {
 			token.kind = TokenKindSeparator
 			lexer.nextRune()
+			token.location.SetWidth(3)
 		}
 		lexer.addToken(token)
 	} else if lexer.char == '>' {
 		token := lexer.newToken()
 		token.kind = TokenKindReturnDirection
+		token.location.SetWidth(2)
 
 		err = lexer.nextRune() 
 		if err != nil { return }
@@ -362,9 +422,9 @@ func (lexer *LexingOperation) skipSpaces () (err error) {
 func (lexer *LexingOperation) nextRune () (err error) {
 	lexer.char, _, err = lexer.file.ReadRune()
 	if err != nil && err != io.EOF {
-		return file.NewError (
+		return infoerr.NewError (
 			lexer.file.Location(1),
-			err.Error(), file.ErrorKindError)
+			err.Error(), infoerr.ErrorKindError)
 	}
 	return
 }

lexer/lexer_test.go

@@ -3,8 +3,17 @@ package lexer
 import "testing"
 import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
-func checkTokenSlice (filePath string, correct []Token, test *testing.T) {
+func quickToken (width int, kind TokenKind, value any) (token Token) {
+	token.location.SetWidth(width)
+	token.kind  = kind
+	token.value = value
+	return
+}
+
+func checkTokenSlice (filePath string, test *testing.T, correct ...Token) {
+	test.Log("checking lexer results for", filePath)
 	file, err := file.Open(filePath)
 	if err != nil {
 		test.Log(err)
@@ -34,6 +43,15 @@ func checkTokenSlice (filePath string, correct []Token, test *testing.T) {
 	test.Log("token slice length match", len(tokens), "=", len(correct))
 
 	for index, token := range tokens {
+		if token.location.Width() != correct[index].location.Width() {
+			test.Log("token", index, "has bad width")
+			test.Log (
+				"have", token.location.Width(),
+				"want", correct[index].location.Width())
+			test.Fail()
+			return
+		}
+		
 		if !token.Equals(correct[index]) {
 			test.Log("token", index, "not equal")
 			test.Log (
@@ -46,118 +64,209 @@ func checkTokenSlice (filePath string, correct []Token, test *testing.T) {
 	test.Log("token slice content match")
 }
 
+func compareErr (
+	filePath string,
+	correctKind    infoerr.ErrorKind,
+	correctMessage string,
+	correctRow     int,
+	correctColumn  int,
+	correctWidth   int,
+	test *testing.T,
+) {
+	test.Log("testing errors in", filePath)
+	file, err := file.Open(filePath)
+	if err != nil {
+		test.Log(err)
+		test.Fail()
+		return
+	}
+	
+	_, err = Tokenize(file)
+	check := err.(infoerr.Error)
+
+	test.Log("error that was recieved:")
+	test.Log(check)
+
+	if check.Kind() != correctKind {
+		test.Log("mismatched error kind")
+		test.Log("- want:", correctKind)
+		test.Log("- have:", check.Kind())
+		test.Fail()
+	}
+
+	if check.Message() != correctMessage {
+		test.Log("mismatched error message")
+		test.Log("- want:", correctMessage)
+		test.Log("- have:", check.Message())
+		test.Fail()
+	}
+
+	if check.Row() != correctRow {
+		test.Log("mismatched error row")
+		test.Log("- want:", correctRow)
+		test.Log("- have:", check.Row())
+		test.Fail()
+	}
+
+	if check.Column() != correctColumn {
+		test.Log("mismatched error column")
+		test.Log("- want:", correctColumn)
+		test.Log("- have:", check.Column())
+		test.Fail()
+	}
+
+	if check.Width() != correctWidth {
+		test.Log("mismatched error width")
+		test.Log("- want:", check.Width())
+		test.Log("- have:", correctWidth)
+		test.Fail()
+	}
+}
+
 func TestTokenizeAll (test *testing.T) {
-	checkTokenSlice("../tests/lexer/all.arf", []Token {
+	checkTokenSlice("../tests/lexer/all.arf", test,
-		Token { kind: TokenKindSeparator },
+		quickToken(3, TokenKindSeparator, nil),
-		Token { kind: TokenKindPermission, value: types.Permission {
+		quickToken(2, TokenKindPermission, types.PermissionReadWrite),
-			Internal: types.ModeRead,
+		quickToken(2, TokenKindReturnDirection, nil),
-			External: types.ModeWrite,
+		quickToken(10, TokenKindInt, int64(-349820394)),
-		}},
+		quickToken(9, TokenKindUInt, uint64(932748397)),
-		Token { kind: TokenKindReturnDirection },
+		quickToken(12, TokenKindFloat, 239485.37520),
-		Token { kind: TokenKindInt, value: int64(-349820394) },
+		quickToken(16, TokenKindString, "hello world!\n"),
-		Token { kind: TokenKindUInt, value: uint64(932748397) },
+		quickToken(3, TokenKindRune, 'E'),
-		Token { kind: TokenKindFloat, value: 239485.37520 },
+		quickToken(10, TokenKindName, "helloWorld"),
-		Token { kind: TokenKindString, value: "hello world!\n" },
+		quickToken(1, TokenKindColon, nil),
-		Token { kind: TokenKindRune, value: 'E' },
+		quickToken(1, TokenKindDot, nil),
-		Token { kind: TokenKindName, value: "helloWorld" },
+		quickToken(1, TokenKindComma, nil),
-		Token { kind: TokenKindColon },
+		quickToken(2, TokenKindElipsis, nil),
-		Token { kind: TokenKindDot },
+		quickToken(1, TokenKindLBracket, nil),
-		Token { kind: TokenKindComma },
+		quickToken(1, TokenKindRBracket, nil),
-		Token { kind: TokenKindElipsis },
+		quickToken(1, TokenKindLBrace, nil),
-		Token { kind: TokenKindLBracket },
+		quickToken(1, TokenKindRBrace, nil),
-		Token { kind: TokenKindRBracket },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindLBrace },
+		quickToken(1, TokenKindPlus, nil),
-		Token { kind: TokenKindRBrace },
+		quickToken(1, TokenKindMinus, nil),
-		Token { kind: TokenKindNewline },
+		quickToken(2, TokenKindIncrement, nil),
-		Token { kind: TokenKindPlus },
+		quickToken(2, TokenKindDecrement, nil),
-		Token { kind: TokenKindMinus },
+		quickToken(1, TokenKindAsterisk, nil),
-		Token { kind: TokenKindIncrement },
+		quickToken(1, TokenKindSlash, nil),
-		Token { kind: TokenKindDecrement },
+		quickToken(1, TokenKindAt, nil),
-		Token { kind: TokenKindAsterisk },
+		quickToken(1, TokenKindExclamation, nil),
-		Token { kind: TokenKindSlash },
+		quickToken(1, TokenKindPercent, nil),
-		Token { kind: TokenKindAt },
+		quickToken(2, TokenKindPercentAssignment, nil),
-		Token { kind: TokenKindExclamation },
+		quickToken(1, TokenKindTilde, nil),
-		Token { kind: TokenKindPercent },
+		quickToken(2, TokenKindTildeAssignment, nil),
-		Token { kind: TokenKindTilde },
+		quickToken(1, TokenKindEqualTo, nil),
-		Token { kind: TokenKindLessThan },
+		quickToken(2, TokenKindNotEqualTo, nil),
-		Token { kind: TokenKindLShift },
+		quickToken(1, TokenKindLessThan, nil),
-		Token { kind: TokenKindGreaterThan },
+		quickToken(2, TokenKindLessThanEqualTo, nil),
-		Token { kind: TokenKindRShift },
+		quickToken(2, TokenKindLShift, nil),
-		Token { kind: TokenKindBinaryOr },
+		quickToken(3, TokenKindLShiftAssignment, nil),
-		Token { kind: TokenKindLogicalOr },
+		quickToken(1, TokenKindGreaterThan, nil),
-		Token { kind: TokenKindBinaryAnd },
+		quickToken(2, TokenKindGreaterThanEqualTo, nil),
-		Token { kind: TokenKindLogicalAnd },
+		quickToken(2, TokenKindRShift, nil),
-		Token { kind: TokenKindNewline },
+		quickToken(3, TokenKindRShiftAssignment, nil),
-	}, test)
+		quickToken(1, TokenKindBinaryOr, nil),
+		quickToken(2, TokenKindBinaryOrAssignment, nil),
+		quickToken(2, TokenKindLogicalOr, nil),
+		quickToken(1, TokenKindBinaryAnd, nil),
+		quickToken(2, TokenKindBinaryAndAssignment, nil),
+		quickToken(2, TokenKindLogicalAnd, nil),
+		quickToken(1, TokenKindBinaryXor, nil),
+		quickToken(2, TokenKindBinaryXorAssignment, nil),
+		quickToken(1, TokenKindNewline, nil),
+	)
 }
 
 func TestTokenizeNumbers (test *testing.T) {
-	checkTokenSlice("../tests/lexer/numbers.arf", []Token {
+	checkTokenSlice("../tests/lexer/numbers.arf", test,
-		Token { kind: TokenKindUInt, value: uint64(0) },
+		quickToken(1, TokenKindUInt, uint64(0)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindUInt, value: uint64(8) },
+		quickToken(1, TokenKindUInt, uint64(8)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindUInt, value: uint64(83628266) },
+		quickToken(8, TokenKindUInt, uint64(83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindUInt, value: uint64(83628266) },
+		quickToken(29, TokenKindUInt, uint64(83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindUInt, value: uint64(83628266) },
+		quickToken(9, TokenKindUInt, uint64(83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindUInt, value: uint64(83628266) },
+		quickToken(10, TokenKindUInt, uint64(83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
 		
-		Token { kind: TokenKindInt, value: int64(-83628266) },
+		quickToken(9, TokenKindInt, int64(-83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindInt, value: int64(-83628266) },
+		quickToken(30, TokenKindInt, int64(-83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindInt, value: int64(-83628266) },
+		quickToken(10, TokenKindInt, int64(-83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindInt, value: int64(-83628266) },
+		quickToken(11, TokenKindInt, int64(-83628266)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
 		
-		Token { kind: TokenKindFloat, value: float64(0.123478) },
+		quickToken(8, TokenKindFloat, float64(0.123478)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindFloat, value: float64(234.3095) },
+		quickToken(8, TokenKindFloat, float64(234.3095)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindFloat, value: float64(-2.312) },
+		quickToken(6, TokenKindFloat, float64(-2.312)),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-	}, test)
+	)
 }
 
 func TestTokenizeText (test *testing.T) {
-	checkTokenSlice("../tests/lexer/text.arf", []Token {
+	checkTokenSlice("../tests/lexer/text.arf", test,
-		Token { kind: TokenKindString, value: "hello world!\a\b\f\n\r\t\v'\"\\" },
+		quickToken(34, TokenKindString, "hello world!\a\b\f\n\r\t\v'\"\\"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindRune, value: '\a' },
+		quickToken(4, TokenKindRune, '\a'),
-		Token { kind: TokenKindRune, value: '\b' },
+		quickToken(4, TokenKindRune, '\b'),
-		Token { kind: TokenKindRune, value: '\f' },
+		quickToken(4, TokenKindRune, '\f'),
-		Token { kind: TokenKindRune, value: '\n' },
+		quickToken(4, TokenKindRune, '\n'),
-		Token { kind: TokenKindRune, value: '\r' },
+		quickToken(4, TokenKindRune, '\r'),
-		Token { kind: TokenKindRune, value: '\t' },
+		quickToken(4, TokenKindRune, '\t'),
-		Token { kind: TokenKindRune, value: '\v' },
+		quickToken(4, TokenKindRune, '\v'),
-		Token { kind: TokenKindRune, value: '\'' },
+		quickToken(4, TokenKindRune, '\''),
-		Token { kind: TokenKindRune, value: '"'  },
+		quickToken(4, TokenKindRune, '"' ),
-		Token { kind: TokenKindRune, value: '\\' },
+		quickToken(4, TokenKindRune, '\\'),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindString, value: "hello world \x40\u0040\U00000040!" },
+		quickToken(35, TokenKindString, "hello world \x40\u0040\U00000040!"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-	}, test)
+	)
 }
 
 func TestTokenizeIndent (test *testing.T) {
-	checkTokenSlice("../tests/lexer/indent.arf", []Token {
+	checkTokenSlice("../tests/lexer/indent.arf", test,
-		Token { kind: TokenKindName, value: "line1" },
+		quickToken(5, TokenKindName, "line1"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindIndent, value: 1 },
+		quickToken(1, TokenKindIndent, 1),
-		Token { kind: TokenKindName, value: "line2" },
+		quickToken(5, TokenKindName, "line2"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindIndent, value: 4 },
+		quickToken(4, TokenKindIndent, 4),
-		Token { kind: TokenKindName, value: "line3" },
+		quickToken(5, TokenKindName, "line3"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindName, value: "line4" },
+		quickToken(5, TokenKindName, "line4"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-		Token { kind: TokenKindIndent, value: 2 },
+		quickToken(2, TokenKindIndent, 2),
-		Token { kind: TokenKindName, value: "line5" },
+		quickToken(5, TokenKindName, "line5"),
-		Token { kind: TokenKindNewline },
+		quickToken(1, TokenKindNewline, nil),
-	}, test)
+	)
+}
+
+func TestTokenizeErr (test *testing.T) {
+	compareErr (
+		"../tests/lexer/error/unexpectedSymbol.arf",
+		infoerr.ErrorKindError,
+		"unexpected symbol character ;",
+		1, 5, 1,
+		test)
+	
+	compareErr (
+		"../tests/lexer/error/excessDataRune.arf",
+		infoerr.ErrorKindError,
+		"excess data in rune literal",
+		1, 1, 7,
+		test)
+	
+	compareErr (
+		"../tests/lexer/error/unknownEscape.arf",
+		infoerr.ErrorKindError,
+		"unknown escape character g",
+		1, 2, 1,
+		test)
 }

lexer/numbers.go

@@ -1,32 +1,55 @@
 package lexer
 
 import "strconv"
-import "git.tebibyte.media/sashakoshka/arf/file"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // tokenizeSymbolBeginning lexes a token that starts with a number.
 func (lexer *LexingOperation) tokenizeNumberBeginning (negative bool) (err error) {
 	var intNumber   uint64
 	var floatNumber float64
 	var isFloat     bool
+	var amountRead  int
+	var totalRead   int
 
 	token := lexer.newToken()
 
 	if lexer.char == '0' {
 		lexer.nextRune()
+		totalRead ++
 
 		if lexer.char == 'x' {
 			lexer.nextRune()
-			intNumber, floatNumber, isFloat, err = lexer.tokenizeNumber(16)
+			totalRead ++
+			intNumber, floatNumber,
+			isFloat, amountRead,
+			err = lexer.tokenizeNumber(16)
+			
 		} else if lexer.char == 'b' {
 			lexer.nextRune()
-			intNumber, floatNumber, isFloat, err = lexer.tokenizeNumber(2)
+			totalRead ++
+			intNumber, floatNumber,
+			isFloat, amountRead,
+			err = lexer.tokenizeNumber(2)
+			
 		} else if lexer.char == '.' {
-			intNumber, floatNumber, isFloat, err = lexer.tokenizeNumber(10)
+			intNumber, floatNumber,
+			isFloat, amountRead,
+			err = lexer.tokenizeNumber(10)
+			
 		} else if lexer.char >= '0' && lexer.char <= '9' {
-			intNumber, floatNumber, isFloat, err = lexer.tokenizeNumber(8)
+			intNumber, floatNumber,
+			isFloat, amountRead,
+			err = lexer.tokenizeNumber(8)
 		}
 	} else {
-		intNumber, floatNumber, isFloat, err = lexer.tokenizeNumber(10)
+		intNumber, floatNumber,
+		isFloat, amountRead,
+		err = lexer.tokenizeNumber(10)
+	}
+
+	totalRead += amountRead
+	if negative {
+		totalRead += 1
 	}
 
 	if err != nil { return }
@@ -48,6 +71,7 @@ func (lexer *LexingOperation) tokenizeNumberBeginning (negative bool) (err error
 		}		
 	}
 
+	token.location.SetWidth(totalRead)
 	lexer.addToken(token)
 	return
 }
@@ -82,6 +106,7 @@ func (lexer *LexingOperation) tokenizeNumber (
 	intNumber   uint64,
 	floatNumber float64,
 	isFloat     bool,
+	amountRead  int,
 	err         error,
 ) {
 	got := ""
@@ -89,10 +114,10 @@ func (lexer *LexingOperation) tokenizeNumber (
 		if !runeIsDigit(lexer.char, radix) { break }
 		if lexer.char == '.' {
 			if radix != 10 {
-				err = file.NewError (
+				err = infoerr.NewError (
 					lexer.file.Location(1),
 					"floats must have radix of 10",
-					file.ErrorKindError)
+					infoerr.ErrorKindError)
 				return
 			}
 			isFloat = true
@@ -103,6 +128,8 @@ func (lexer *LexingOperation) tokenizeNumber (
 		if err != nil { return }
 	}
 
+	amountRead = len(got)
+
 	if isFloat {
 		floatNumber, err = strconv.ParseFloat(got, 64)
 	} else {
@@ -110,10 +137,10 @@ func (lexer *LexingOperation) tokenizeNumber (
 	}
 	
 	if err != nil {
-		err = file.NewError (
+		err = infoerr.NewError (
 			lexer.file.Location(1),
 			"could not parse number: " + err.Error(),
-			file.ErrorKindError)
+			infoerr.ErrorKindError)
 		return
 	}
 

lexer/text.go

@@ -1,7 +1,7 @@
 package lexer
 
 import "strconv"
-import "git.tebibyte.media/sashakoshka/arf/file"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // tokenizeString tokenizes a string or rune literal.
 func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
@@ -9,17 +9,20 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 	if err != nil { return }
 
 	token := lexer.newToken()
-
 	got   := ""
+	tokenWidth := 2
 
+	beginning := lexer.file.Location(1)
 	for {
-		// TODO: add hexadecimal escape codes
 		if lexer.char == '\\' {
 			err = lexer.nextRune()
+			tokenWidth ++
 			if err != nil { return }
 
 			var actual     rune
-			actual, err = lexer.getEscapeSequence()
+			var amountRead int
+			actual, amountRead, err = lexer.getEscapeSequence()
+			tokenWidth += amountRead
 			if err != nil { return }
 
 			got += string(actual)
@@ -27,6 +30,7 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 			got += string(lexer.char)
 			
 			err = lexer.nextRune()
+			tokenWidth ++
 			if err != nil { return }
 		}
 
@@ -40,12 +44,13 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 	err = lexer.nextRune()
 	if err != nil { return }
 
+	beginning.SetWidth(len(got))
 	if isRuneLiteral {
 		if len(got) > 1 {
-			err = file.NewError (
+			err = infoerr.NewError (
-				lexer.file.Location(1),
+				beginning,
 				"excess data in rune literal",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
 		}
 
@@ -56,6 +61,7 @@ func (lexer *LexingOperation) tokenizeString (isRuneLiteral bool) (err error) {
 		token.value = got
 	}
 
+	token.location.SetWidth(tokenWidth)
 	lexer.addToken(token)
 	return
 }
@@ -76,16 +82,22 @@ var escapeSequenceMap = map[rune] rune {
 }
 
 // getEscapeSequence reads an escape sequence in a string or rune literal.
-func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
+func (lexer *LexingOperation) getEscapeSequence () (
+	result     rune,
+	amountRead int,
+	err        error,
+) {
 	result, exists := escapeSequenceMap[lexer.char]
 	if exists {
                 err = lexer.nextRune()
+                amountRead ++
                 return
 	} else if lexer.char >= '0' && lexer.char <= '7' {
                 // octal escape sequence
                 number := string(lexer.char)
         
                 err = lexer.nextRune()
+                amountRead ++
                 if err != nil { return }
                 
                 for len(number) < 3 {
@@ -94,14 +106,15 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                         number += string(lexer.char)
                         
 	                err = lexer.nextRune()
+	                amountRead ++
 	                if err != nil { return }
                 }
                 
                 if len(number) < 3 {
-			err = file.NewError (
+			err = infoerr.NewError (
 				lexer.file.Location(1),
 				"octal escape sequence too short",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
                 }
 
@@ -117,6 +130,7 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                 number := ""
 
                 err = lexer.nextRune()
+                amountRead ++
                 if err != nil { return }
                 
                 for len(number) < want {
@@ -128,24 +142,25 @@ func (lexer *LexingOperation) getEscapeSequence () (result rune, err error) {
                         number += string(lexer.char)
                         
 			err = lexer.nextRune()
+	                amountRead ++
 			if err != nil { return }
                 }
                 
                 if len(number) < want {
-			err = file.NewError (
+			err = infoerr.NewError (
 				lexer.file.Location(1),
 				"hex escape sequence too short ",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
                 }
 
                 parsedNumber, _ := strconv.ParseInt(number, 16, want * 4)
                 result = rune(parsedNumber)
 	} else {
-		err = file.NewError (
+		err = infoerr.NewError (
 			lexer.file.Location(1),
 			"unknown escape character " +
-			string(lexer.char), file.ErrorKindError)
+			string(lexer.char), infoerr.ErrorKindError)
 		return
 	}
 

lexer/token.go

@@ -2,6 +2,7 @@ package lexer
 
 import "fmt"
 import "git.tebibyte.media/sashakoshka/arf/file"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // TokenKind is an enum represzenting what role a token has.
 type TokenKind int
@@ -42,16 +43,28 @@ const (
         TokenKindAt
         TokenKindExclamation
         TokenKindPercent
+        TokenKindPercentAssignment
         TokenKindTilde
+        TokenKindTildeAssignment
 
+        TokenKindEqualTo
+        TokenKindNotEqualTo
+        TokenKindLessThanEqualTo
         TokenKindLessThan
         TokenKindLShift
+        TokenKindLShiftAssignment
         TokenKindGreaterThan
+        TokenKindGreaterThanEqualTo
         TokenKindRShift
+        TokenKindRShiftAssignment
         TokenKindBinaryOr
+        TokenKindBinaryOrAssignment
         TokenKindLogicalOr
         TokenKindBinaryAnd
+        TokenKindBinaryAndAssignment
         TokenKindLogicalAnd
+        TokenKindBinaryXor
+        TokenKindBinaryXorAssignment
 )
 
 // Token represents a single token. It holds its location in the file, as well
@@ -89,8 +102,13 @@ func (token Token) Location () (location file.Location) {
 }
 
 // NewError creates a new error at this token's location.
-func (token Token) NewError (message string, kind file.ErrorKind) (err file.Error) {
+func (token Token) NewError (
-	return token.location.NewError(message, kind)
+	message string,
+	kind    infoerr.ErrorKind,
+) (
+	err infoerr.Error,
+) {
+	return infoerr.NewError(token.location, message, kind)
 }
 
 // Describe generates a textual description of the token to be used in debug
@@ -165,24 +183,48 @@ func (tokenKind TokenKind) Describe () (description string) {
 		description = "Exclamation"
 	case TokenKindPercent:
 		description = "Percent"
+	case TokenKindPercentAssignment:
+		description = "PercentAssignment"
 	case TokenKindTilde:
 		description = "Tilde"
+	case TokenKindTildeAssignment:
+		description = "TildeAssignment"
+	case TokenKindEqualTo:
+		description = "EqualTo"
+	case TokenKindNotEqualTo:
+		description = "NotEqualTo"
 	case TokenKindLessThan:
 		description = "LessThan"
+	case TokenKindLessThanEqualTo:
+		description = "LessThanEqualTo"
 	case TokenKindLShift:
 		description = "LShift"
+	case TokenKindLShiftAssignment:
+		description = "LShiftAssignment"
 	case TokenKindGreaterThan:
 		description = "GreaterThan"
+	case TokenKindGreaterThanEqualTo:
+		description = "GreaterThanEqualTo"
 	case TokenKindRShift:
 		description = "RShift"
+	case TokenKindRShiftAssignment:
+		description = "RShiftAssignment"
 	case TokenKindBinaryOr:
 		description = "BinaryOr"
+	case TokenKindBinaryOrAssignment:
+		description = "BinaryOrAssignment"
 	case TokenKindLogicalOr:
 		description = "LogicalOr"
 	case TokenKindBinaryAnd:
 		description = "BinaryAnd"
+	case TokenKindBinaryAndAssignment:
+		description = "BinaryAndAssignment"
 	case TokenKindLogicalAnd:
 		description = "LogicalAnd"
+	case TokenKindBinaryXor:
+		description = "BinaryXor"
+	case TokenKindBinaryXorAssignment:
+		description = "BinaryXorAssignment"
 	}
 
 	return

parser/argument.go

@@ -1,7 +1,7 @@
 package parser
 
-import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 var validArgumentStartTokens = []lexer.TokenKind {
 	lexer.TokenKindName,
@@ -37,7 +37,7 @@ func (parser *ParsingOperation) parseArgument () (argument Argument, err error)
 				err = parser.token.NewError (
 					"cannot use member selection in " +
 					"a variable definition",
-					file.ErrorKindError)
+					infoerr.ErrorKindError)
 				return
 			}
 

parser/body.go

@@ -1,7 +1,7 @@
 package parser
 
-import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // parse body parses the body of an arf file, after the metadata header.
 func (parser *ParsingOperation) parseBody () (err error) {
@@ -21,13 +21,54 @@ func (parser *ParsingOperation) parseBody () (err error) {
 			parser.tree.dataSections[section.name] = section
 			if err != nil { return }
 		case "type":
+			var section *TypeSection
+			section, err = parser.parseTypeSection()
+			if parser.tree.typeSections == nil {
+				parser.tree.typeSections =
+					make(map[string] *TypeSection)
+			}
+			parser.tree.typeSections[section.name] = section
+			if err != nil { return }
+		case "objt":
+			var section *ObjtSection
+			section, err = parser.parseObjtSection()
+			if parser.tree.objtSections == nil {
+				parser.tree.objtSections =
+					make(map[string] *ObjtSection)
+			}
+			parser.tree.objtSections[section.name] = section
+			if err != nil { return }
 		case "face":
+			var section *FaceSection
+			section, err = parser.parseFaceSection()
+			if parser.tree.faceSections == nil {
+				parser.tree.faceSections =
+					make(map[string] *FaceSection)
+			}
+			parser.tree.faceSections[section.name] = section
+			if err != nil { return }
 		case "enum":
+			var section *EnumSection
+			section, err = parser.parseEnumSection()
+			if parser.tree.enumSections == nil {
+				parser.tree.enumSections =
+					make(map[string] *EnumSection)
+			}
+			parser.tree.enumSections[section.name] = section
+			if err != nil { return }
 		case "func":
+			var section *FuncSection
+			section, err = parser.parseFuncSection()
+			if parser.tree.funcSections == nil {
+				parser.tree.funcSections =
+					make(map[string] *FuncSection)
+			}
+			parser.tree.funcSections[section.name] = section
+			if err != nil { return }
 		default:
 			err = parser.token.NewError (
 				"unknown section type \"" + sectionType + "\"",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
 		}
 	}

parser/data.go

@@ -1,8 +1,8 @@
 package parser
 
-import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/types"
 import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // parseData parses a data section.
 func (parser *ParsingOperation) parseDataSection () (
@@ -94,9 +94,6 @@ func (parser *ParsingOperation) parseObjectInitializationValues () (
 	initializationValues ObjectInitializationValues,
 	err                  error,
 ) {
-	println("BEGIN")
-	defer println("END")
-	
 	initializationValues.attributes = make(map[string] Argument)
 
 	baseIndent := 0
@@ -116,8 +113,6 @@ func (parser *ParsingOperation) parseObjectInitializationValues () (
 		// do not parse any further if the indent has changed
 		if indent != baseIndent { break }
 
-		println("HIT")
-
 		// move on to the beginning of the line, which must contain
 		// a member initialization value
 		err = parser.nextToken(lexer.TokenKindDot)
@@ -132,7 +127,7 @@ func (parser *ParsingOperation) parseObjectInitializationValues () (
 			err = parser.token.NewError (
 				"duplicate member \"" + name + "\" in object " +
 				"member initialization",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
 		}
 
@@ -273,7 +268,7 @@ func (parser *ParsingOperation) parseType () (what Type, err error) {
 		default:
 			err = parser.token.NewError (
 				"unknown type qualifier \"" + qualifier + "\"",
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 			return
 		}
 		
@@ -294,8 +289,6 @@ func (parser *ParsingOperation) parseIdentifier () (
 	identifier.location = parser.token.Location()
 
 	for {
-		// TODO: eat up newlines and tabs after the dot, but not before
-		// it.
 		if !parser.token.Is(lexer.TokenKindName) { break }
 
 		identifier.trail = append (
@@ -306,6 +299,18 @@ func (parser *ParsingOperation) parseIdentifier () (
 		if err != nil { return }
 		
 		if !parser.token.Is(lexer.TokenKindDot) { break }
+
+		err = parser.nextToken()
+		if err != nil { return }
+
+		// allow the identifier to continue on to the next line if there
+		// is a line break right after the dot
+		for parser.token.Is(lexer.TokenKindNewline) ||
+			parser.token.Is(lexer.TokenKindIndent) {
+
+			err = parser.nextToken()
+			if err != nil { return }
+		}
 	}
 
 	return

parser/data_test.go

@@ -0,0 +1,38 @@
+package parser
+
+import "testing"
+
+func TestData (test *testing.T) {
+	checkTree ("../tests/parser/data",
+`:arf
+---
+data ro integer:Int 3202
+data ro integerArray16:{Int 16}
+data ro integerArrayInitialized:{Int 16}
+	3948
+	293
+	293049
+	948
+	912
+	340
+	0
+	2304
+	0
+	4785
+	92
+data ro integerArrayVariable:{Int ..}
+data ro integerPointer:{Int}
+data ro mutInteger:Int:mut 3202
+data ro mutIntegerPointer:{Int}:mut
+data ro nestedObject:Obj
+	.that
+		.bird2 123.8439
+		.bird3 9328.21348239
+	.this
+		.bird0 324
+		.bird1 "hello world"
+data ro object:thing.thing.thing.thing
+	.that 2139
+	.this 324
+`, test)
+}

parser/enum.go

@@ -0,0 +1,93 @@
+package parser
+
+import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
+
+func (parser *ParsingOperation) parseEnumSection () (
+	section *EnumSection,
+	err     error,
+) {
+	err = parser.expect(lexer.TokenKindName)
+	if err != nil { return }
+	
+	section = &EnumSection { location: parser.token.Location() }
+
+	// get permission
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	section.permission = parser.token.Value().(types.Permission)
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.name = parser.token.Value().(string)
+
+	// parse inherited type
+	err = parser.nextToken(lexer.TokenKindColon)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+	section.what, err = parser.parseType()
+	if err != nil { return }
+	err = parser.expect(lexer.TokenKindNewline)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+
+	// parse members
+	err = parser.parseEnumMembers(section)
+	if err != nil { return }
+	
+	if len(section.members) == 0 {
+		infoerr.NewError (
+			section.location,
+			"defining an enum with no members",
+			infoerr.ErrorKindWarn).Print()
+	}
+	return
+}
+
+// parseEnumMembers parses a list of members for an enum section. Indentation
+// level is assumed.
+func (parser *ParsingOperation) parseEnumMembers (
+	into *EnumSection,
+) (
+	err error,
+) {
+	
+	for {
+		// if we've left the block, stop parsing
+		if !parser.token.Is(lexer.TokenKindIndent) { return }
+		if parser.token.Value().(int) != 1         { return }
+
+		member := EnumMember { }
+		
+		// get name
+		err = parser.nextToken(lexer.TokenKindName)
+		if err != nil { return }
+		member.location = parser.token.Location()
+		member.name = parser.token.Value().(string)
+		err = parser.nextToken()
+		if err != nil { return }
+	
+		// parse default value
+		if parser.token.Is(lexer.TokenKindNewline) {
+			err = parser.nextToken()
+			if err != nil { return }
+
+			member.value, err = parser.parseInitializationValues(1)
+			into.members = append(into.members, member)
+			if err != nil { return }
+		} else {
+			member.value, err = parser.parseArgument()
+			into.members = append(into.members, member)
+			if err != nil { return }
+
+			err = parser.expect(lexer.TokenKindNewline)
+			if err != nil { return }
+			err = parser.nextToken()
+			if err != nil { return }
+		}
+	}
+}

parser/enum_test.go

@@ -0,0 +1,38 @@
+package parser
+
+import "testing"
+
+func TestEnum (test *testing.T) {
+	checkTree ("../tests/parser/enum",
+`:arf
+---
+enum ro AffrontToGod:{Int 4}
+	bird0
+		28394
+		9328
+		398
+		9
+	bird1
+		23
+		932832
+		398
+		2349
+	bird2
+		1
+		2
+		3
+		4
+enum ro NamedColor:U32
+	red 16711680
+	green 65280
+	blue 255
+enum ro Weekday:Int
+	sunday
+	monday
+	tuesday
+	wednesday
+	thursday
+	friday
+	saturday
+`, test)
+}

parser/face.go

@@ -0,0 +1,132 @@
+package parser
+
+import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
+
+// parseFaceSection parses an interface section.
+func (parser *ParsingOperation) parseFaceSection () (
+	section *FaceSection,
+	err     error,
+) {
+	err = parser.expect(lexer.TokenKindName)
+	if err != nil { return }
+	
+	section = &FaceSection {
+		location: parser.token.Location(),
+		behaviors:  make(map[string] FaceBehavior),
+	}
+
+	// get permission
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	section.permission = parser.token.Value().(types.Permission)
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.name = parser.token.Value().(string)
+
+	// parse inherited interface
+	err = parser.nextToken(lexer.TokenKindColon)
+	if err != nil { return }
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.inherits, err = parser.parseIdentifier()
+	if err != nil { return }
+	err = parser.nextToken(lexer.TokenKindNewline)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+
+	// parse members
+	for {
+		// if we've left the block, stop parsing
+		if !parser.token.Is(lexer.TokenKindIndent) { return }
+		if parser.token.Value().(int) != 1         { return }
+
+		// parse behavior
+		behaviorBeginning := parser.token.Location()
+		var behavior FaceBehavior
+		behavior, err = parser.parseFaceBehavior()
+
+		// add to section
+		_, exists := section.behaviors[behavior.name]
+		if exists {
+			err = infoerr.NewError (
+				behaviorBeginning,
+				"multiple behaviors named " + behavior.name +
+				" in this interface",
+				infoerr.ErrorKindError)
+			return
+		}
+		section.behaviors[behavior.name] = behavior
+		
+		if err != nil { return }
+	}
+	return
+}
+
+// parseFaceBehavior parses a single interface behavior. Indentation level is
+// assumed.
+func (parser *ParsingOperation) parseFaceBehavior () (
+	behavior FaceBehavior,
+	err      error,
+) {
+	err = parser.expect(lexer.TokenKindIndent)
+	if err != nil { return }
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	behavior.name = parser.token.Value().(string)
+
+	err = parser.nextToken(lexer.TokenKindNewline)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+	
+	for {
+		// if we've left the block, stop parsing
+		if !parser.token.Is(lexer.TokenKindIndent) { return }
+		if parser.token.Value().(int) != 2         { return }
+
+		// get preceding symbol
+		err = parser.nextToken (
+			lexer.TokenKindGreaterThan,
+			lexer.TokenKindLessThan)
+		if err != nil { return }
+		kind := parser.token.Kind()
+
+		var declaration Declaration
+
+		// get name
+		err = parser.nextToken(lexer.TokenKindName)
+		if err != nil { return }
+		declaration.name = parser.token.Value().(string)
+
+		// parse inherited type
+		err = parser.nextToken(lexer.TokenKindColon)
+		if err != nil { return }
+		err = parser.nextToken()
+		if err != nil { return }
+		declaration.what, err = parser.parseType()
+		if err != nil { return }
+		err = parser.expect(lexer.TokenKindNewline)
+		if err != nil { return }
+		err = parser.nextToken()
+		if err != nil { return }
+
+		if kind == lexer.TokenKindGreaterThan {
+			behavior.inputs = append (
+				behavior.inputs,
+				declaration)
+		} else {
+			behavior.outputs = append (
+				behavior.outputs,
+				declaration)
+		}
+	}
+	
+	return
+}

parser/func.go

@@ -0,0 +1,30 @@
+package parser
+
+import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/lexer"
+// import "git.tebibyte.media/sashakoshka/arf/infoerr"
+
+// parseFunc parses a function section.
+func (parser *ParsingOperation) parseFuncSection () (
+	section *FuncSection,
+	err     error,
+) {
+	err = parser.expect(lexer.TokenKindName)
+	if err != nil { return }
+	
+	section = &FuncSection { location: parser.token.Location() }
+
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	section.permission = parser.token.Value().(types.Permission)
+
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.name = parser.token.Value().(string)
+
+	err = parser.nextToken(lexer.TokenKindNewline)
+	if err != nil { return }
+	
+	return
+}
+

parser/func_test.go

@@ -0,0 +1,111 @@
+package parser
+
+import "testing"
+
+func TestFunc (test *testing.T) {
+	checkTree ("../tests/parser/func",
+`:arf
+---
+func ro aBasicExternal
+	> someInput:Int:mut
+	< someOutput:Int 4
+	---
+	external
+func ro bMethod
+	@ bird:{Bird}
+	> someInput:Int:mut
+	< someOutput:Int 4
+	---
+	external
+func ro cBasicPhrases
+	---
+	[fn 329 983 09]
+	[fn 329 983 09]
+	[fn 329 983 091]
+	[fn [gn 329 983 091] 123]
+func ro dArgumentTypes
+	---
+	[bird tree butterfly.wing "hello world" grass:{Int:mut 8}]
+func ro eMath
+	[> x:Int]
+	[> y:Int]
+	[< z:Int]
+	[---]
+	[++ x]
+	[-- y]
+	[set z [+ [* 0392 00] 98 x [/ 9832 y] 930]]
+	[! true]
+	[~ 0b01]
+	[% 873 32]
+	[=  5 5]
+	[!= 4 4]
+	[<=  4 98]
+	[<   4 98]
+	[<<  0x0F 4]
+	[>=  98 4]
+	[>   98 4]
+	[>>  0xF0 4]
+	[|  0b01 0b10]
+	[& 0b110 0b011]
+	[&& true true]
+	[|| true false]
+func ro fReturnDirection
+	< err:Error
+	---
+	[someFunc 498 2980 90] -> thing:Int err
+	[otherFunc] -> thing err:Error
+	[fn 329 983 091] -> thing:Int err
+func ro gControlFlow
+	---
+	[if condition]
+		[something]
+	[if condition]
+		[something]
+	[elseif]
+		[otherThing]
+	[else]
+		[finalThing]
+	[while [< x 432]]
+		[something]
+	[switch value]
+	[: 324]
+		[something]
+	[: 93284]
+		otherThing
+	[: 9128 34738 7328]
+		multipleCases
+	[:]
+		[defaultThing]
+	[for index:Size element:Int someArray]
+		[something]
+		[someNextThing]
+		[justMakingSureBlockParsingWorks]
+	[if condition]
+		[if condition]
+			[nestedThing]
+		[else]
+			[otherThing]
+	[else]
+		[if condition]
+			[nestedThing]
+		[else]
+			[otherThing]
+func hSetPhrase
+	---
+	[set x:Int 3]
+	[set y:{Int} [. x]]
+	[set z:{Int 8}]
+		398
+		9
+		2309
+		983
+		-2387
+		478
+		555
+		123
+	[set bird:Bird]
+		.that
+			.whenYou 99999
+		.this 324
+`, test)
+}

parser/meta.go

@@ -1,7 +1,7 @@
 package parser
 
-import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // parseMeta parsese the metadata header at the top of an arf file.
 func (parser *ParsingOperation) parseMeta () (err error) {
@@ -35,7 +35,7 @@ func (parser *ParsingOperation) parseMeta () (err error) {
 		default:
 			parser.token.NewError (
 				"unrecognized metadata field: " + field,
-				file.ErrorKindError)
+				infoerr.ErrorKindError)
 		}
 
 		err = parser.nextToken(lexer.TokenKindNewline)

parser/meta_test.go

@@ -0,0 +1,14 @@
+package parser
+
+import "testing"
+
+func TestMeta (test *testing.T) {
+	checkTree ("../tests/parser/meta",
+`:arf
+author "Sasha Koshka"
+license "GPLv3"
+require "someModule"
+require "otherModule"
+---
+`, test)
+}

parser/objt.go

@@ -0,0 +1,127 @@
+package parser
+
+import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
+
+// parseObjtSection parses an object type definition. This allows for structured
+// types to be defined, and for member variables to be added and overridden.
+func (parser *ParsingOperation) parseObjtSection () (
+	section *ObjtSection,
+	err     error,
+) {
+	err = parser.expect(lexer.TokenKindName)
+	if err != nil { return }
+	
+	section = &ObjtSection { location: parser.token.Location() }
+
+	// get permission
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	section.permission = parser.token.Value().(types.Permission)
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.name = parser.token.Value().(string)
+
+	// parse inherited type
+	err = parser.nextToken(lexer.TokenKindColon)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+	section.inherits, err = parser.parseIdentifier()
+	if err != nil { return }
+	err = parser.expect(lexer.TokenKindNewline)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+
+	// parse members
+	err = parser.parseObjtMembers(section)
+	if err != nil { return }
+	
+	if len(section.members) == 0 {
+		infoerr.NewError (
+			section.location,
+			"defining an object with no members",
+			infoerr.ErrorKindWarn).Print()
+	}
+	return
+}
+
+// parseObjtMembers parses a list of members for an object section. Indentation
+// level is assumed.
+func (parser *ParsingOperation) parseObjtMembers (
+	into *ObjtSection,
+) (
+	err     error,
+) {
+	for {
+		// if we've left the block, stop parsing
+		if !parser.token.Is(lexer.TokenKindIndent) { return }
+		if parser.token.Value().(int) != 1         { return }
+		
+		// add member to object section
+		var member ObjtMember
+		member, err = parser.parseObjtMember()
+		into.members = append(into.members, member)
+		if err != nil { return }
+	}
+}
+
+// parseObjtMember parses a single member of an object section. Indentation
+// level is assumed.
+func (parser *ParsingOperation) parseObjtMember () (
+	member ObjtMember,
+	err    error,
+) {
+	// get permission
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	member.permission = parser.token.Value().(types.Permission)
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	member.name = parser.token.Value().(string)
+
+	// get type
+	err = parser.nextToken(lexer.TokenKindColon)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+	member.what, err = parser.parseType()
+	if err != nil { return }
+
+	println(parser.token.Describe())
+	
+	// if there is a bit width, get it
+	if parser.token.Is(lexer.TokenKindBinaryAnd) {
+		err = parser.nextToken(lexer.TokenKindUInt)
+		if err != nil { return }
+		member.bitWidth = parser.token.Value().(uint64)
+		err = parser.nextToken()
+		if err != nil { return }
+	}
+	
+	// parse default value
+	if parser.token.Is(lexer.TokenKindNewline) {
+		err = parser.nextToken()
+		if err != nil { return }
+
+		member.defaultValue,
+		err = parser.parseInitializationValues(1)
+		if err != nil { return }
+	} else {
+		member.defaultValue, err = parser.parseArgument()
+		if err != nil { return }
+
+		err = parser.expect(lexer.TokenKindNewline)
+		if err != nil { return }
+		err = parser.nextToken()
+		if err != nil { return }
+	}
+
+	return 
+}

parser/objt_test.go

@@ -0,0 +1,31 @@
+package parser
+
+import "testing"
+
+func TestObjt (test *testing.T) {
+	checkTree ("../tests/parser/objt",
+`:arf
+---
+objt ro Basic:Obj
+	ro that:Basic
+	ro this:Basic
+objt ro BitFields:Obj
+	ro that:Int & 1
+	ro this:Int & 24 298
+objt ro ComplexInit:Obj
+	ro whatever:{Int 3}
+		230984
+		849
+		394580
+	ro complex0:Bird
+		.that 98
+		.this 2
+	ro complex1:Bird
+		.that 98902
+		.this 235
+	ro basic:Int 87
+objt ro Init:Obj
+	ro that:String "hello world"
+	ro this:Int 23
+`, test)
+}

parser/parser.go

@@ -5,6 +5,7 @@ import "os"
 import "path/filepath"
 import "git.tebibyte.media/sashakoshka/arf/file"
 import "git.tebibyte.media/sashakoshka/arf/lexer"
+import "git.tebibyte.media/sashakoshka/arf/infoerr"
 
 // ParsingOperation holds information about an ongoing parsing operation.
 type ParsingOperation struct {
@@ -96,9 +97,9 @@ func (parser *ParsingOperation) expect (allowed ...lexer.TokenKind) (err error)
 		message += allowedItem.Describe()
 	}
 
-	err = file.NewError (
+	err = infoerr.NewError (
 		parser.token.Location(),
-		message, file.ErrorKindError)
+		message, infoerr.ErrorKindError)
 	return
 }
 

parser/test-common.go

@@ -1,6 +1,7 @@
 package parser
 
 import "io"
+import "strings"
 import "testing"
 // import "git.tebibyte.media/sashakoshka/arf/types"
 
@@ -10,9 +11,9 @@ func checkTree (modulePath string, correct string, test *testing.T) {
 	treeRunes  := []rune(treeString)
 	
 	test.Log("CORRECT TREE:")
-	test.Log(correct)
+	logWithLineNumbers(correct, test)
 	test.Log("WHAT WAS PARSED:")
-	test.Log(treeString)
+	logWithLineNumbers(treeString, test)
 	
 	if err != io.EOF && err != nil {
 		test.Log("returned error:")
@@ -63,49 +64,11 @@ func checkTree (modulePath string, correct string, test *testing.T) {
 	}
 }
 
-func TestMeta (test *testing.T) {
+func logWithLineNumbers (bigString string, test *testing.T) {
-	checkTree ("../tests/parser/meta",
+	lines := strings.Split (
-`:arf
+		strings.Replace(bigString, "\t", "        ", -1), "\n")
-author "Sasha Koshka"
-license "GPLv3"
-require "someModule"
-require "otherModule"
----
-`, test)
-}
 
-func TestData (test *testing.T) {
+	for index, line := range lines {
-	checkTree ("../tests/parser/data",
+		test.Logf("%3d | %s", index + 1, line)
-`:arf
+	}
----
-data wr integer:Int 3202
-data wr integerArray16:{Int 16}
-data wr integerArrayInitialized:{Int 16}
-	3948
-	293
-	293049
-	948
-	912
-	340
-	0
-	2304
-	0
-	4785
-	92
-data wr integerArrayVariable:{Int ..}
-data wr integerPointer:{Int}
-data wr mutInteger:Int:mut 3202
-data wr mutIntegerPointer:{Int}:mut
-data wr nestedObject:Obj
-	.that
-		.bird2 123.8439
-		.bird3 9328.21348239
-	.this
-		.bird0 324
-		.bird1 "hello world"
-data wr object:Obj
-	.that 2139
-	.this 324
-`, test)
 }
-

parser/tree-tostring.go

@@ -46,6 +46,26 @@ func (tree *SyntaxTree) ToString (indent int) (output string) {
 	
 	output += doIndent(indent, "---\n")
 
+	typeSectionKeys := sortMapKeysAlphabetically(tree.typeSections)
+	for _, name := range typeSectionKeys {
+		output += tree.typeSections[name].ToString(indent)
+	}
+
+	objtSectionKeys := sortMapKeysAlphabetically(tree.objtSections)
+	for _, name := range objtSectionKeys {
+		output += tree.objtSections[name].ToString(indent)
+	}
+
+	enumSectionKeys := sortMapKeysAlphabetically(tree.enumSections)
+	for _, name := range enumSectionKeys {
+		output += tree.enumSections[name].ToString(indent)
+	}
+
+	faceSectionKeys := sortMapKeysAlphabetically(tree.faceSections)
+	for _, name := range faceSectionKeys {
+		output += tree.faceSections[name].ToString(indent)
+	}
+
 	dataSectionKeys := sortMapKeysAlphabetically(tree.dataSections)
 	for _, name := range dataSectionKeys {
 		output += tree.dataSections[name].ToString(indent)
@@ -246,3 +266,126 @@ func (section *DataSection) ToString (indent int) (output string) {
 	}
 	return
 }
+
+func (section *TypeSection) ToString (indent int) (output string) {
+	output += doIndent (
+		indent,
+		"type ",
+		section.permission.ToString(), " ",
+		section.name, ":",
+		section.inherits.ToString())
+
+	isComplexInitialization :=
+		section.defaultValue.kind == ArgumentKindObjectInitializationValues ||
+		section.defaultValue.kind == ArgumentKindArrayInitializationValues
+
+	if section.defaultValue.value == nil {
+		output += "\n"
+	} else if isComplexInitialization {
+		output += "\n"
+		output += section.defaultValue.ToString(indent + 1, true)
+	} else {
+		output += " " + section.defaultValue.ToString(0, false)
+		output += "\n"
+	}
+	return
+}
+
+func (member ObjtMember) ToString (indent int) (output string) {
+	output += doIndent(indent)
+	
+	output += member.permission.ToString() + " "
+	output += member.name + ":"
+	output += member.what.ToString()
+
+	if member.bitWidth > 0 {
+		output += fmt.Sprint(" & ", member.bitWidth)
+	}
+	
+	isComplexInitialization :=
+		member.defaultValue.kind == ArgumentKindObjectInitializationValues ||
+		member.defaultValue.kind == ArgumentKindArrayInitializationValues
+	
+	if member.defaultValue.value == nil {
+		output += "\n"
+	} else if isComplexInitialization {
+		output += "\n"
+		output += member.defaultValue.ToString(indent + 1, true)
+	} else {
+		output += " " + member.defaultValue.ToString(0, false)
+		output += "\n"
+	}
+
+	return
+}
+
+func (section *ObjtSection) ToString (indent int) (output string) {
+	output += doIndent (
+		indent,
+		"objt ",
+		section.permission.ToString(), " ",
+		section.name, ":",
+		section.inherits.ToString(), "\n")
+
+	for _, member := range section.members {
+		output += member.ToString(indent + 1)
+	}
+	return
+}
+
+func (section *EnumSection) ToString (indent int) (output string) {
+	output += doIndent (
+		indent,
+		"enum ",
+		section.permission.ToString(), " ",
+		section.name, ":",
+		section.what.ToString(), "\n")
+
+	for _, member := range section.members {
+		output += doIndent(indent + 1, member.name)
+	
+		isComplexInitialization :=
+			member.value.kind == ArgumentKindObjectInitializationValues ||
+			member.value.kind == ArgumentKindArrayInitializationValues
+		
+		if member.value.value == nil {
+			output += "\n"
+		} else if isComplexInitialization {
+			output += "\n"
+			output += member.value.ToString(indent + 2, true)
+		} else {
+			output += " " + member.value.ToString(0, false)
+			output += "\n"
+		}
+	}
+	return
+}
+
+func (section *FaceSection) ToString (indent int) (output string) {
+	output += doIndent (
+		indent,
+		"face ",
+		section.permission.ToString(), " ",
+		section.name, ":",
+		section.inherits.ToString(), "\n")
+
+	for _, name := range sortMapKeysAlphabetically(section.behaviors) {
+		behavior := section.behaviors[name]
+		output += behavior.ToString(indent + 1)
+	}
+	return
+}
+
+func (behavior *FaceBehavior) ToString (indent int) (output string) {
+	output += doIndent(indent, behavior.name, "\n")
+	
+	for _, inputItem := range behavior.inputs {
+		output += doIndent(indent + 1, "> ", inputItem.ToString(), "\n")
+	}
+	
+	for _, outputItem := range behavior.outputs {
+		output += doIndent(indent + 1, "< ", outputItem.ToString(), "\n")
+	}
+
+	return
+}

parser/tree.go

@@ -11,7 +11,12 @@ type SyntaxTree struct {
 	author  string
 
 	requires     []string
+	typeSections map[string] *TypeSection
+	objtSections map[string] *ObjtSection
+	enumSections map[string] *EnumSection
+	faceSections map[string] *FaceSection
 	dataSections map[string] *DataSection
+	funcSections map[string] *FuncSection
 }
 
 // Identifier represents a chain of arguments separated by a dot.
@@ -156,6 +161,89 @@ type DataSection struct {
 	name     string
 	
 	what       Type
-	value      Argument
 	permission types.Permission
+	value      Argument
+}
+
+// TypeSection represents a blind type definition.
+type TypeSection struct {
+	location file.Location
+	name     string
+	
+	inherits     Type
+	permission   types.Permission
+	defaultValue Argument
+}
+
+// ObjtMember represents a part of an object type definition.
+type ObjtMember struct {
+	location file.Location
+	name     string
+
+	what         Type
+	bitWidth     uint64
+	permission   types.Permission
+	defaultValue Argument
+}
+
+// ObjtSection represents an object type definition
+type ObjtSection struct {
+	location file.Location
+	name     string
+
+	inherits     Identifier
+	permission   types.Permission
+	members      []ObjtMember
+}
+
+type EnumMember struct {
+	location file.Location
+	name     string
+	value    Argument
+}
+
+// EnumSection represents an enumerated type section.
+type EnumSection struct {
+	location file.Location
+	name     string
+	
+	what       Type
+	permission types.Permission
+	members    []EnumMember
+}
+
+// FaceBehavior represents a behavior of an interface section.
+type FaceBehavior struct {
+	location file.Location
+	name string
+
+	inputs  []Declaration
+	outputs []Declaration
+}
+
+// FaceSection represents an interface type section.
+type FaceSection struct {
+	location file.Location
+	name     string
+	inherits Identifier
+	
+	permission types.Permission
+	behaviors  map[string] FaceBehavior
+}
+
+// Block represents a scoped/indented block of code.
+// TODO: blocks will not directly nest. nested blocks will be stored as a part
+// of certain control flow statements.
+type Block []Phrase
+
+// FuncSection represents a function section.
+type FuncSection struct {
+	location   file.Location
+	name       string
+	permission types.Permission
+	
+	receiver *Declaration
+	inputs   []Declaration
+	outputs  []Declaration
+	root     *Block
 }

parser/type.go

@@ -0,0 +1,53 @@
+package parser
+
+import "git.tebibyte.media/sashakoshka/arf/types"
+import "git.tebibyte.media/sashakoshka/arf/lexer"
+// import "git.tebibyte.media/sashakoshka/arf/infoerr"
+
+// parseTypeSection parses a blind type definition, meaning it can inherit from
+// anything including primitives, but cannot define structure.
+func (parser *ParsingOperation) parseTypeSection () (
+	section *TypeSection,
+	err     error,
+) {
+	err = parser.expect(lexer.TokenKindName)
+	if err != nil { return }
+	
+	section = &TypeSection { location: parser.token.Location() }
+
+	// get permission
+	err = parser.nextToken(lexer.TokenKindPermission)
+	if err != nil { return }
+	section.permission = parser.token.Value().(types.Permission)
+
+	// get name
+	err = parser.nextToken(lexer.TokenKindName)
+	if err != nil { return }
+	section.name = parser.token.Value().(string)
+
+	// parse inherited type
+	err = parser.nextToken(lexer.TokenKindColon)
+	if err != nil { return }
+	err = parser.nextToken()
+	if err != nil { return }
+	section.inherits, err = parser.parseType()
+	if err != nil { return }
+
+	// parse default values
+	if parser.token.Is(lexer.TokenKindNewline) {
+		err = parser.nextToken()
+		if err != nil { return }
+
+		section.defaultValue, err = parser.parseInitializationValues(0)
+		if err != nil { return }
+	} else {
+		section.defaultValue, err = parser.parseArgument()
+		if err != nil { return }
+
+		err = parser.expect(lexer.TokenKindNewline)
+		if err != nil { return }
+		err = parser.nextToken()
+		if err != nil { return }
+	}
+	return
+}

parser/type_test.go

@@ -0,0 +1,17 @@
+package parser
+
+import "testing"
+
+func TestType (test *testing.T) {
+	checkTree ("../tests/parser/type",
+`:arf
+---
+type ro Basic:Int
+type ro BasicInit:Int 6
+type ro IntArray:{Int ..}
+type ro IntArrayInit:{Int 3}
+	3298
+	923
+	92
+`, test)
+}

tests/lexer/all.arf

@@ -1,3 +1,3 @@
 :arf
 --- rw -> -349820394 932748397 239485.37520 "hello world!\n" 'E' helloWorld:.,..[]{}
-+ - ++ -- * / @ ! % ~ < << > >> | || & &&
++ - ++ -- * / @ ! % %= ~ ~= = != < <= << <<= > >= >> >>= | |= || & &= && ^ ^=

tests/lexer/error/excessDataRune.arf

@@ -0,0 +1,2 @@
+:arf
+'aaaaaaa'

tests/lexer/error/unexpectedSymbol.arf

@@ -0,0 +1,2 @@
+:arf
+hello;

tests/lexer/error/unknownEscape.arf

@@ -0,0 +1,2 @@
+:arf
+"\g"

tests/parser/data/main.arf

@@ -1,19 +1,19 @@
 :arf
 ---
 
-data wr integer:Int 3202
+data ro integer:Int 3202
 
-data wr mutInteger:Int:mut 3202
+data ro mutInteger:Int:mut 3202
 
-data wr integerPointer:{Int}
+data ro integerPointer:{Int}
 
-data wr mutIntegerPointer:{Int}:mut
+data ro mutIntegerPointer:{Int}:mut
 
-data wr integerArray16:{Int 16}
+data ro integerArray16:{Int 16}
 
-data wr integerArrayVariable:{Int ..}
+data ro integerArrayVariable:{Int ..}
 
-data wr integerArrayInitialized:{Int 16}
+data ro integerArrayInitialized:{Int 16}
 	3948 293 293049 948 912
 	340 0 2304 0 4785 92
 
@@ -22,11 +22,13 @@ data wr integerArrayInitialized:{Int 16}
 
 # data wr mutIntegerPointerInit:{Int}:mut [& integer]
 
-data wr object:Obj
+# TODO: maybe test identifiers somewhere else?
+data ro object:thing.thing.
+	thing.thing
 	.this 324
 	.that 2139
 
-data wr nestedObject:Obj
+data ro nestedObject:Obj
 	.this
 		.bird0 324
 		.bird1 "hello world"
@@ -35,7 +37,7 @@ data wr nestedObject:Obj
 		.bird3 9328.21348239
 
 
-# func rr main
+# func ro main
 	# ---
 	# # TODO: set should be a special case, checking under itself for object
 	# member initialization args. it should also check for args in general

tests/parser/enum/main.arf

@@ -0,0 +1,30 @@
+:arf
+---
+
+enum ro Weekday:Int
+	sunday
+	monday
+	tuesday
+	wednesday
+	thursday
+	friday
+	saturday
+
+enum ro NamedColor:U32
+	red   0xFF0000
+	green 0x00FF00
+	blue  0x0000FF
+
+enum ro AffrontToGod:{Int 4}
+	bird0
+		28394 9328
+		398 9
+	bird1
+		23 932832
+		398
+		2349
+	bird2
+		1
+		2
+		3
+		4

tests/parser/face/main.arf

@@ -0,0 +1,15 @@
+:arf
+---
+
+face ro ReadWriter:Face
+	write
+		> data:{Byte ..}
+		< wrote:Int
+		< err:Error
+	read
+		> into:{Byte ..}
+		< read:Int
+		< err:Error
+
+face ro Destroyer:Face
+	destroy

tests/parser/func/main.arf

@@ -0,0 +1,134 @@
+:arf
+---
+func ro aBasicExternal
+	> someInput:Int:mut
+	< someOutput:Int 4
+	---
+	external
+
+func ro bMethod
+	@ bird:{Bird}
+	> someInput:Int:mut
+	< someOutput:Int 4
+	---
+	external
+
+func ro cBasicPhrases
+	---
+	fn 329 983 09
+	[fn 329 983 09]
+	[fn
+		329
+		983
+		091]
+	fn [gn
+		329 983
+		091] 123
+
+func ro dArgumentTypes
+	---
+	[bird tree butterfly.wing "hello world"
+		grass:{Int:mut 8}]
+
+func ro eMath
+	> x:Int
+	> y:Int
+	< z:Int
+	---
+	++ x
+	-- y
+	set z [+ [* 0392 00] 98 x [/ 9832 y] 930]
+
+	# TODO: need tokens ~=
+	
+	! true
+	~ 0b01
+	# ~= x
+	% 873 32
+
+	=  5 5
+	!= 4 4
+	
+	<=  4 98
+	<   4 98
+	<<  0x0F 4
+	# <<= x 4
+
+	>=  98 4
+	>   98 4
+	>>  0xF0 4
+	# >>= x 4
+
+	|  0b01 0b10
+	# |= x 0b10
+	& 0b110 0b011
+	# &= x 0b011
+
+	&& true true
+	|| true false
+
+func ro fReturnDirection
+	< err:Error
+	---
+	someFunc 498 2980 90 -> thing:Int err
+	otherFunc -> thing err:Error
+	
+	[fn
+		329
+		983
+		091] -> thing:Int err
+
+func ro gControlFlow
+	---
+	if condition
+		something
+	
+	if condition
+		something
+	elseif
+		[otherThing]
+	else
+		finalThing
+	
+	while [< x 432]
+		something
+	
+	switch value
+	: 324
+		something
+	[: 93284]
+		otherThing
+	: 9128 34738 7328
+		multipleCases
+	:
+		[defaultThing]
+	
+	for index:Size element:Int someArray
+		something
+		someNextThing
+		justMakingSureBlockParsingWorks
+
+	[if condition]
+		if condition
+			nestedThing
+		else
+			otherThing
+	else
+		if condition
+			nestedThing
+		else
+			otherThing
+
+func hSetPhrase
+	---
+	set x:Int 3
+	# TODO: this should be the "location of" phrase. update other things to
+	# match.
+	set y:{Int} [. x]
+	set z:{Int 8}
+		398 9 2309 983 -2387
+		478 555 123
+	set bird:Bird
+		.that
+			.whenYou 99999
+		.this 324

tests/parser/objt/main.arf

@@ -0,0 +1,25 @@
+:arf
+---
+objt ro Basic:Obj
+	ro that:Basic
+	ro this:Basic
+
+objt ro BitFields:Obj
+	ro that:Int & 1
+	ro this:Int & 24 298
+
+objt ro Init:Obj
+	ro that:String "hello world"
+	ro this:Int 23
+
+objt ro ComplexInit:Obj
+	ro whatever:{Int 3}
+		230984
+		849 394580
+	ro complex0:Bird
+		.that 98
+		.this 2
+	ro complex1:Bird
+		.that 98902
+		.this 235
+	ro basic:Int 87

tests/parser/type/main.arf

@@ -0,0 +1,10 @@
+:arf
+---
+type ro Basic:Int
+
+type ro BasicInit:Int 6
+
+type ro IntArray:{Int ..}
+
+type ro IntArrayInit:{Int 3}
+	3298 923 92

types/permission.go

@@ -1,48 +1,63 @@
 package types
 
-type Mode int
+type Permission int
 
 const (
-	ModeNone = iota
+	// Displays as: pv
-	ModeRead
+	//
-	ModeWrite
+	// Other modules cannot access the section or member.
+	PermissionPrivate Permission = iota
+
+	// Displays as: ro
+	//
+	// Other modules can access the section or member, but can only read its
+	// value. It is effectively immutable.
+	// 
+	// Data sections, member variables, etc: The value can be read by other
+	// modules but not altered by them
+	//
+	// Functions: The function can be called by other modules.
+	//
+	// Methods: The method can be called by other modules, but cannot be
+	// overriden by a type defined in another module inheriting from this
+	// method's reciever.
+	PermissionReadOnly
+
+	// Displays as: rw
+	//
+	// Other modules cannot only access the section or member's value, but
+	// can alter it. It is effectively mutable. 
+	// 
+	// Data sections, member variables, etc: The value can be read and
+	// altered at will by other modules.
+	//
+	// Functions: This permission cannot be applied to non-method functions.
+	//
+	// Methods: The method can be called by other modules, and overridden by
+	// types defined in other modules inheriting from the method's reciever.
+	PermissionReadWrite
 )
 
-type Permission struct {
+// PermissionFrom creates a new permission value from the specified text. If the
-	Internal Mode
+// input text was not valid, the function returns false for worked. Otherwise,
-	External Mode
+// it returns true.
+func PermissionFrom (data string) (permission Permission, worked bool) {
+	worked = true
+	switch data {
+	case "pv": permission = PermissionPrivate
+	case "ro": permission = PermissionReadOnly
+	case "rw": permission = PermissionReadWrite
+	default:   worked = false
 	}
-
-func ModeFrom (char rune) (mode Mode) {
-	switch (char) {
-	case 'n': mode = ModeNone
-	case 'r': mode = ModeRead
-	case 'w': mode = ModeWrite	
-	}
-
-	return
-}
-
-func PermissionFrom (data string) (permission Permission) {
-	if len(data) != 2 { return }
-
-	permission.Internal = ModeFrom(rune(data[0]))
-	permission.External = ModeFrom(rune(data[1]))
-	return
-}
-
-func (mode Mode) ToString () (output string) {
-	switch mode {
-	case ModeNone:  output = "n"
-	case ModeRead:  output = "r"
-	case ModeWrite: output = "w"
-	}
-
 	return
 }
 
+// ToString converts the permission value into a string.
 func (permission Permission) ToString () (output string) {
-	output += permission.Internal.ToString()
+	switch permission {
-	output += permission.External.ToString()
+	case PermissionPrivate:   output = "pv"
+	case PermissionReadOnly:  output = "ro"
+	case PermissionReadWrite: output = "rw"
+	}
 	return
 }