Namespace packages with "urubu/"

8 files changed, 0 insertions, 2943 deletions

diff --git a/spec/test/parser.go b/spec/test/parser.go
deleted file mode 100644
index b7265d7..0000000
--- a/spec/test/parser.go
+++ /dev/null
@@ -1,336 +0,0 @@
-//go:generate vartan compile tree.vartan -o tree.json
-//go:generate vartan-go tree.json --package test
-
-package test
-
-import (
-	"bufio"
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"regexp"
-	"strconv"
-	"strings"
-	"unicode/utf8"
-)
-
-type TreeDiff struct {
-	ExpectedPath string
-	ActualPath   string
-	Message      string
-}
-
-func newTreeDiff(expected, actual *Tree, message string) *TreeDiff {
-	return &TreeDiff{
-		ExpectedPath: expected.path(),
-		ActualPath:   actual.path(),
-		Message:      message,
-	}
-}
-
-type Tree struct {
-	Parent   *Tree
-	Offset   int
-	Kind     string
-	Children []*Tree
-	Lexeme   string
-}
-
-func NewNonTerminalTree(kind string, children ...*Tree) *Tree {
-	return &Tree{
-		Kind:     kind,
-		Children: children,
-	}
-}
-
-func NewTerminalNode(kind string, lexeme string) *Tree {
-	return &Tree{
-		Kind:   kind,
-		Lexeme: lexeme,
-	}
-}
-
-func (t *Tree) Fill() *Tree {
-	for i, c := range t.Children {
-		c.Parent = t
-		c.Offset = i
-		c.Fill()
-	}
-	return t
-}
-
-func (t *Tree) path() string {
-	if t.Parent == nil {
-		return t.Kind
-	}
-	return fmt.Sprintf("%v.[%v]%v", t.Parent.path(), t.Offset, t.Kind)
-}
-
-func (t *Tree) Format() []byte {
-	var b bytes.Buffer
-	t.format(&b, 0)
-	return b.Bytes()
-}
-
-func (t *Tree) format(buf *bytes.Buffer, depth int) {
-	for i := 0; i < depth; i++ {
-		buf.WriteString("    ")
-	}
-	buf.WriteString("(")
-	buf.WriteString(t.Kind)
-	if len(t.Children) > 0 {
-		buf.WriteString("\n")
-		for i, c := range t.Children {
-			c.format(buf, depth+1)
-			if i < len(t.Children)-1 {
-				buf.WriteString("\n")
-			}
-		}
-	}
-	buf.WriteString(")")
-}
-
-func DiffTree(expected, actual *Tree) []*TreeDiff {
-	if expected == nil && actual == nil {
-		return nil
-	}
-	if actual.Kind != expected.Kind {
-		msg := fmt.Sprintf("unexpected kind: expected '%v' but got '%v'", expected.Kind, actual.Kind)
-		return []*TreeDiff{
-			newTreeDiff(expected, actual, msg),
-		}
-	}
-	if expected.Lexeme != actual.Lexeme {
-		msg := fmt.Sprintf("unexpected lexeme: expected '%v' but got '%v'", expected.Lexeme, actual.Lexeme)
-		return []*TreeDiff{
-			newTreeDiff(expected, actual, msg),
-		}
-	}
-	if len(actual.Children) != len(expected.Children) {
-		msg := fmt.Sprintf("unexpected node count: expected %v but got %v", len(expected.Children), len(actual.Children))
-		return []*TreeDiff{
-			newTreeDiff(expected, actual, msg),
-		}
-	}
-	var diffs []*TreeDiff
-	for i, exp := range expected.Children {
-		if ds := DiffTree(exp, actual.Children[i]); len(ds) > 0 {
-			diffs = append(diffs, ds...)
-		}
-	}
-	return diffs
-}
-
-type TestCase struct {
-	Description string
-	Source      []byte
-	Output      *Tree
-}
-
-func ParseTestCase(r io.Reader) (*TestCase, error) {
-	parts, err := splitIntoParts(r)
-	if err != nil {
-		return nil, err
-	}
-	if len(parts) != 3 {
-		return nil, fmt.Errorf("too many or too few part delimiters: a test case consists of just tree parts: %v parts found", len(parts))
-	}
-
-	tp := &treeParser{
-		lineOffset: parts[0].lineCount + parts[1].lineCount + 2,
-	}
-	tree, err := tp.parseTree(bytes.NewReader(parts[2].buf))
-	if err != nil {
-		return nil, err
-	}
-
-	return &TestCase{
-		Description: string(parts[0].buf),
-		Source:      parts[1].buf,
-		Output:      tree,
-	}, nil
-}
-
-type testCasePart struct {
-	buf       []byte
-	lineCount int
-}
-
-func splitIntoParts(r io.Reader) ([]*testCasePart, error) {
-	var bufs []*testCasePart
-	s := bufio.NewScanner(r)
-	for {
-		buf, lineCount, err := readPart(s)
-		if err != nil {
-			return nil, err
-		}
-		if buf == nil {
-			break
-		}
-		bufs = append(bufs, &testCasePart{
-			buf:       buf,
-			lineCount: lineCount,
-		})
-	}
-	if err := s.Err(); err != nil {
-		return nil, err
-	}
-	return bufs, nil
-}
-
-var reDelim = regexp.MustCompile(`^\s*---+\s*$`)
-
-func readPart(s *bufio.Scanner) ([]byte, int, error) {
-	if !s.Scan() {
-		return nil, 0, s.Err()
-	}
-	buf := &bytes.Buffer{}
-	line := s.Bytes()
-	if reDelim.Match(line) {
-		// Return an empty slice because (*bytes.Buffer).Bytes() returns nil if we have never written data.
-		return []byte{}, 0, nil
-	}
-	_, err := buf.Write(line)
-	if err != nil {
-		return nil, 0, err
-	}
-	lineCount := 1
-	for s.Scan() {
-		line := s.Bytes()
-		if reDelim.Match(line) {
-			return buf.Bytes(), lineCount, nil
-		}
-		_, err := buf.Write([]byte("\n"))
-		if err != nil {
-			return nil, 0, err
-		}
-		_, err = buf.Write(line)
-		if err != nil {
-			return nil, 0, err
-		}
-		lineCount++
-	}
-	if err := s.Err(); err != nil {
-		return nil, 0, err
-	}
-	return buf.Bytes(), lineCount, nil
-}
-
-type treeParser struct {
-	lineOffset int
-}
-
-func (tp *treeParser) parseTree(src io.Reader) (*Tree, error) {
-	toks, err := NewTokenStream(src)
-	if err != nil {
-		return nil, err
-	}
-	gram := NewGrammar()
-	tb := NewDefaultSyntaxTreeBuilder()
-	p, err := NewParser(toks, gram, SemanticAction(NewASTActionSet(gram, tb)))
-	if err != nil {
-		return nil, err
-	}
-	err = p.Parse()
-	if err != nil {
-		return nil, err
-	}
-	synErrs := p.SyntaxErrors()
-	if len(synErrs) > 0 {
-		var b strings.Builder
-		b.Write(formatSyntaxError(synErrs[0], gram, tp.lineOffset))
-		for _, synErr := range synErrs[1:] {
-			b.WriteRune('\n')
-			b.Write(formatSyntaxError(synErr, gram, tp.lineOffset))
-		}
-		return nil, errors.New(b.String())
-	}
-	t, err := tp.genTree(tb.Tree())
-	if err != nil {
-		return nil, err
-	}
-	return t.Fill(), nil
-}
-
-func formatSyntaxError(synErr *SyntaxError, gram Grammar, lineOffset int) []byte {
-	var b bytes.Buffer
-
-	b.WriteString(fmt.Sprintf("%v:%v: %v: ", lineOffset+synErr.Row+1, synErr.Col+1, synErr.Message))
-
-	tok := synErr.Token
-	switch {
-	case tok.EOF():
-		b.WriteString("<eof>")
-	case tok.Invalid():
-		b.WriteString(fmt.Sprintf("'%v' (<invalid>)", string(tok.Lexeme())))
-	default:
-		if term := gram.Terminal(tok.TerminalID()); term != "" {
-			b.WriteString(fmt.Sprintf("'%v' (%v)", string(tok.Lexeme()), term))
-		} else {
-			b.WriteString(fmt.Sprintf("'%v'", string(tok.Lexeme())))
-		}
-	}
-	b.WriteString(fmt.Sprintf(": expected: %v", synErr.ExpectedTerminals[0]))
-	for _, t := range synErr.ExpectedTerminals[1:] {
-		b.WriteString(fmt.Sprintf(", %v", t))
-	}
-
-	return b.Bytes()
-}
-
-func (tp *treeParser) genTree(node *Node) (*Tree, error) {
-	// A node labeled 'error' cannot have children. It always must be (error).
-	if sym := node.Children[0]; sym.Text == "error" {
-		if len(node.Children) > 1 {
-			return nil, fmt.Errorf("%v:%v: error node cannot take children", tp.lineOffset+sym.Row+1, sym.Col+1)
-		}
-		return NewTerminalNode(sym.Text, ""), nil
-	}
-
-	if len(node.Children) == 2 && node.Children[1].KindName == "string" {
-		var text string
-		str := node.Children[1].Children[0]
-		switch str.KindName {
-		case "raw_string":
-			text = str.Children[0].Text
-		case "interpreted_string":
-			var b strings.Builder
-			for _, c := range str.Children {
-				switch c.KindName {
-				case "escaped_seq":
-					b.WriteString(strings.TrimPrefix(`\`, c.Text))
-				case "escape_char":
-					return nil, fmt.Errorf("%v:%v: incomplete escape sequence", tp.lineOffset+c.Row+1, c.Col+1)
-				case "codepoint_expr":
-					cp := c.Children[0]
-					n, err := strconv.ParseInt(cp.Text, 16, 64)
-					if err != nil {
-						return nil, fmt.Errorf("%v:%v: %v", tp.lineOffset+cp.Row+1, cp.Col+1, err)
-					}
-					if !utf8.ValidRune(rune(n)) {
-						return nil, fmt.Errorf("%v:%v: invalid code point: %v", tp.lineOffset+cp.Row+1, cp.Col+1, cp.Text)
-					}
-					b.WriteRune(rune(n))
-				default:
-					b.WriteString(c.Text)
-				}
-			}
-			text = b.String()
-		}
-		return NewTerminalNode(node.Children[0].Text, text), nil
-	}
-
-	var children []*Tree
-	if len(node.Children) > 1 {
-		children = make([]*Tree, len(node.Children)-1)
-		for i, c := range node.Children[1:] {
-			var err error
-			children[i], err = tp.genTree(c)
-			if err != nil {
-				return nil, err
-			}
-		}
-	}
-	return NewNonTerminalTree(node.Children[0].Text, children...), nil
-}
diff --git a/spec/test/parser_test.go b/spec/test/parser_test.go
deleted file mode 100644
index eddba92..0000000
--- a/spec/test/parser_test.go
+++ /dev/null
@@ -1,411 +0,0 @@
-package test
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"testing"
-)
-
-func TestTree_Format(t *testing.T) {
-	expected := `(a
-    (b
-        (c))
-    (d)
-    (e))`
-	tree := NewNonTerminalTree("a",
-		NewNonTerminalTree("b",
-			NewNonTerminalTree("c"),
-		),
-		NewNonTerminalTree("d"),
-		NewNonTerminalTree("e"),
-	)
-	actual := string(tree.Format())
-	if actual != expected {
-		t.Fatalf("unexpected format:\n%v", actual)
-	}
-}
-
-func TestDiffTree(t *testing.T) {
-	tests := []struct {
-		t1        *Tree
-		t2        *Tree
-		different bool
-	}{
-		{
-			t1: NewTerminalNode("a", "a"),
-			t2: NewTerminalNode("a", "a"),
-		},
-		{
-			t1:        NewTerminalNode("a", "a"),
-			t2:        NewTerminalNode("a", "A"),
-			different: true,
-		},
-		{
-			t1:        NewTerminalNode("a", "a"),
-			t2:        NewTerminalNode("A", "a"),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a"),
-			t2: NewNonTerminalTree("a"),
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-			),
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-				NewNonTerminalTree("d"),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-				NewNonTerminalTree("d"),
-			),
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b",
-					NewNonTerminalTree("c"),
-				),
-				NewNonTerminalTree("d",
-					NewNonTerminalTree("d"),
-				),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b",
-					NewNonTerminalTree("c"),
-				),
-				NewNonTerminalTree("d",
-					NewNonTerminalTree("d"),
-				),
-			),
-		},
-		{
-			t1:        NewNonTerminalTree("a"),
-			t2:        NewNonTerminalTree("b"),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-			),
-			t2:        NewNonTerminalTree("a"),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a"),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-			),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("c"),
-			),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-				NewNonTerminalTree("d"),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-			),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b"),
-				NewNonTerminalTree("c"),
-				NewNonTerminalTree("d"),
-			),
-			different: true,
-		},
-		{
-			t1: NewNonTerminalTree("a",
-				NewNonTerminalTree("b",
-					NewNonTerminalTree("c"),
-				),
-			),
-			t2: NewNonTerminalTree("a",
-				NewNonTerminalTree("b",
-					NewNonTerminalTree("d"),
-				),
-			),
-			different: true,
-		},
-	}
-	for i, tt := range tests {
-		t.Run(fmt.Sprintf("#%v", i), func(t *testing.T) {
-			diffs := DiffTree(tt.t1, tt.t2)
-			if tt.different && len(diffs) == 0 {
-				t.Fatalf("unexpected result")
-			} else if !tt.different && len(diffs) > 0 {
-				t.Fatalf("unexpected result")
-			}
-		})
-	}
-}
-
-func TestParseTestCase(t *testing.T) {
-	tests := []struct {
-		src      string
-		tc       *TestCase
-		parseErr bool
-	}{
-		{
-			src: `test
----
-foo
----
-(foo)
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte("foo"),
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		{
-			src: `
-test
-
----
-
-foo
-
----
-
-(foo)
-
-`,
-			tc: &TestCase{
-				Description: "\ntest\n",
-				Source:      []byte("\nfoo\n"),
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		// The length of a part delimiter may be greater than 3.
-		{
-			src: `
-test
-----
-foo
-----
-(foo)
-`,
-			tc: &TestCase{
-				Description: "\ntest",
-				Source:      []byte("foo"),
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		// The description part may be empty.
-		{
-			src: `----
-foo
-----
-(foo)
-`,
-			tc: &TestCase{
-				Description: "",
-				Source:      []byte("foo"),
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		// The source part may be empty.
-		{
-			src: `test
----
----
-(foo)
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte{},
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		// NOTE: If there is a delimiter at the end of a test case, we really want to make it a syntax error,
-		// but we allow it to simplify the implementation of the parser.
-		{
-			src: `test
-----
-foo
-----
-(foo)
----
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte("foo"),
-				Output:      NewNonTerminalTree("foo").Fill(),
-			},
-		},
-		{
-			src:      ``,
-			parseErr: true,
-		},
-		{
-			src: `test
----
-`,
-			parseErr: true,
-		},
-		{
-			src: `test
----
-foo
-`,
-			parseErr: true,
-		},
-		{
-			src: `test
----
-foo
----
-`,
-			parseErr: true,
-		},
-		{
-			src: `test
---
-foo
---
-(foo)
-`,
-			parseErr: true,
-		},
-		// A node may have just one string node.
-		{
-			src: `test
-----
-foo bar
-----
-(foo (bar 'bar'))
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte("foo bar"),
-				Output: NewNonTerminalTree("foo",
-					NewTerminalNode("bar", "bar"),
-				).Fill(),
-			},
-		},
-		// A node may have just one pattern node.
-		{
-			src: `test
-----
-foo bar
-----
-(foo (bar "bar"))
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte("foo bar"),
-				Output: NewNonTerminalTree("foo",
-					NewTerminalNode("bar", "bar"),
-				).Fill(),
-			},
-		},
-		// A node may be the error node.
-		{
-			src: `test
-----
-foo x
-----
-(foo (error))
-`,
-			tc: &TestCase{
-				Description: "test",
-				Source:      []byte("foo x"),
-				Output: NewNonTerminalTree("foo",
-					NewTerminalNode("error", ""),
-				).Fill(),
-			},
-		},
-		// The error node cannot have a string node.
-		{
-			src: `test
-----
-foo x
-----
-(foo (error 'x'))
-`,
-			parseErr: true,
-		},
-		// The error node cannot have a pattern node.
-		{
-			src: `test
-----
-foo x
-----
-(foo (error "x"))
-`,
-			parseErr: true,
-		},
-		// The error node cannot have another node.
-		{
-			src: `test
-----
-foo x
-----
-(foo (error (a)))
-`,
-			parseErr: true,
-		},
-		{
-			src: `test
----
-foo
----
-?
-`,
-			parseErr: true,
-		},
-	}
-	for i, tt := range tests {
-		t.Run(fmt.Sprintf("#%v", i), func(t *testing.T) {
-			tc, err := ParseTestCase(strings.NewReader(tt.src))
-			if tt.parseErr {
-				if err == nil {
-					t.Fatalf("an expected error didn't occur")
-				}
-			} else {
-				if err != nil {
-					t.Fatal(err)
-				}
-				testTestCase(t, tt.tc, tc)
-			}
-		})
-	}
-}
-
-func testTestCase(t *testing.T, expected, actual *TestCase) {
-	t.Helper()
-
-	if expected.Description != actual.Description ||
-		!reflect.DeepEqual(expected.Source, actual.Source) ||
-		len(DiffTree(expected.Output, actual.Output)) > 0 {
-		t.Fatalf("unexpected test case: want: %#v, got: %#v", expected, actual)
-	}
-}
diff --git a/spec/test/tree-report.json b/spec/test/tree-report.json
deleted file mode 100644
index c2018e5..0000000
--- a/spec/test/tree-report.json
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/spec/test/tree.vartan b/spec/test/tree.vartan
deleted file mode 100644
index aa8f733..0000000
--- a/spec/test/tree.vartan
+++ /dev/null
@@ -1,87 +0,0 @@
-#name tree;
-
-#prec (
-	#assign l_paren
-	#assign $empty_tree
-);
-
-tree
-	: l_paren identifier tree_list r_paren #ast identifier tree_list...
-	| l_paren identifier string r_paren    #ast identifier string
-	| l_paren error r_paren                #recover #ast error
-	;
-tree_list
-	: tree_list tree #ast tree_list... tree
-	| tree
-	|                #prec $empty_tree
-	;
-string
-	: raw_string
-	| interpreted_string
-	;
-raw_string
-	: raw_string_open opt_raw_string_body raw_string_close #ast opt_raw_string_body...
-	;
-opt_raw_string_body
-	: raw_string_body
-	|
-	;
-interpreted_string
-	: interpreted_string_open opt_interpreted_string_body interpreted_string_close #ast opt_interpreted_string_body...
-	| interpreted_string_open error interpreted_string_close #recover #ast error
-	;
-opt_interpreted_string_body
-	: interpreted_string_body #ast interpreted_string_body...
-	|
-	;
-interpreted_string_body
-	: interpreted_string_body interpreted_string_elem #ast interpreted_string_body... interpreted_string_elem...
-	| interpreted_string_elem                         #ast interpreted_string_elem...
-	;
-interpreted_string_elem
-	: interpreted_seq
-	| l_brace
-	| r_brace
-	| hex_digits
-	| escaped_seq
-	| escape_char
-	| codepoint_expr
-	;
-codepoint_expr
-	: codepoint_prefix l_brace hex_digits r_brace #ast hex_digits
-	;
-
-ws #skip
-	: "[\u{0009}\u{000A}\u{000D}\u{0020}]+";
-l_paren
-	: '(';
-r_paren
-	: ')';
-identifier
-	: "[0-9A-Za-z_]+";
-
-raw_string_open #push raw_string
-	: "'";
-raw_string_body #mode raw_string
-	: "[^']+";
-raw_string_close #mode raw_string #pop
-	: "'";
-
-interpreted_string_open #push interpreted_string
-	: '"';
-interpreted_seq #mode interpreted_string
-	: "[^\"\\{}0-9A-Fa-f]+";
-codepoint_prefix #mode interpreted_string
-	: '\u';
-l_brace #mode interpreted_string
-	: '{';
-r_brace #mode interpreted_string
-	: '}';
-hex_digits #mode interpreted_string
-	: "[0-9A-Fa-f]+";
-escaped_seq #mode interpreted_string
-	: "\\[\"\\]";
-escape_char #mode interpreted_string
-	: '\';
-interpreted_string_close #mode interpreted_string #pop
-	: '"';
diff --git a/spec/test/tree_lexer.go b/spec/test/tree_lexer.go
deleted file mode 100644
index 8bb1c87..0000000
--- a/spec/test/tree_lexer.go
+++ /dev/null
@@ -1,1024 +0,0 @@
-// Code generated by vartan-go. DO NOT EDIT.
-package test
-
-import (
-	"fmt"
-	"io"
-)
-
-type ModeID int
-
-func (id ModeID) Int() int {
-	return int(id)
-}
-
-type StateID int
-
-func (id StateID) Int() int {
-	return int(id)
-}
-
-type KindID int
-
-func (id KindID) Int() int {
-	return int(id)
-}
-
-type ModeKindID int
-
-func (id ModeKindID) Int() int {
-	return int(id)
-}
-
-type LexSpec interface {
-	InitialMode() ModeID
-	Pop(mode ModeID, modeKind ModeKindID) bool
-	Push(mode ModeID, modeKind ModeKindID) (ModeID, bool)
-	ModeName(mode ModeID) string
-	InitialState(mode ModeID) StateID
-	NextState(mode ModeID, state StateID, v int) (StateID, bool)
-	Accept(mode ModeID, state StateID) (ModeKindID, bool)
-	KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string)
-}
-
-// Token representes a token.
-type Token struct {
-	// ModeID is an ID of a lex mode.
-	ModeID ModeID
-
-	// KindID is an ID of a kind. This is unique among all modes.
-	KindID KindID
-
-	// ModeKindID is an ID of a lexical kind. This is unique only within a mode.
-	// Note that you need to use KindID field if you want to identify a kind across all modes.
-	ModeKindID ModeKindID
-
-	// Row is a row number where a lexeme appears.
-	Row int
-
-	// Col is a column number where a lexeme appears.
-	// Note that Col is counted in code points, not bytes.
-	Col int
-
-	// Lexeme is a byte sequence matched a pattern of a lexical specification.
-	Lexeme []byte
-
-	// When this field is true, it means the token is the EOF token.
-	EOF bool
-
-	// When this field is true, it means the token is an error token.
-	Invalid bool
-}
-
-type LexerOption func(l *Lexer) error
-
-// DisableModeTransition disables the active mode transition. Thus, even if the lexical specification has the push and pop
-// operations, the lexer doesn't perform these operations. When the lexical specification has multiple modes, and this option is
-// enabled, you need to call the Lexer.Push and Lexer.Pop methods to perform the mode transition. You can use the Lexer.Mode method
-// to know the current lex mode.
-func DisableModeTransition() LexerOption {
-	return func(l *Lexer) error {
-		l.passiveModeTran = true
-		return nil
-	}
-}
-
-type Lexer struct {
-	spec            LexSpec
-	src             []byte
-	srcPtr          int
-	row             int
-	col             int
-	prevRow         int
-	prevCol         int
-	tokBuf          []*Token
-	modeStack       []ModeID
-	passiveModeTran bool
-}
-
-// NewLexer returns a new lexer.
-func NewLexer(spec LexSpec, src io.Reader, opts ...LexerOption) (*Lexer, error) {
-	b, err := io.ReadAll(src)
-	if err != nil {
-		return nil, err
-	}
-	l := &Lexer{
-		spec:   spec,
-		src:    b,
-		srcPtr: 0,
-		row:    0,
-		col:    0,
-		modeStack: []ModeID{
-			spec.InitialMode(),
-		},
-		passiveModeTran: false,
-	}
-	for _, opt := range opts {
-		err := opt(l)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return l, nil
-}
-
-// Next returns a next token.
-func (l *Lexer) Next() (*Token, error) {
-	if len(l.tokBuf) > 0 {
-		tok := l.tokBuf[0]
-		l.tokBuf = l.tokBuf[1:]
-		return tok, nil
-	}
-
-	tok, err := l.nextAndTransition()
-	if err != nil {
-		return nil, err
-	}
-	if !tok.Invalid {
-		return tok, nil
-	}
-	errTok := tok
-	for {
-		tok, err = l.nextAndTransition()
-		if err != nil {
-			return nil, err
-		}
-		if !tok.Invalid {
-			break
-		}
-		errTok.Lexeme = append(errTok.Lexeme, tok.Lexeme...)
-	}
-	l.tokBuf = append(l.tokBuf, tok)
-
-	return errTok, nil
-}
-
-func (l *Lexer) nextAndTransition() (*Token, error) {
-	tok, err := l.next()
-	if err != nil {
-		return nil, err
-	}
-	if tok.EOF || tok.Invalid {
-		return tok, nil
-	}
-	if l.passiveModeTran {
-		return tok, nil
-	}
-	mode := l.Mode()
-	if l.spec.Pop(mode, tok.ModeKindID) {
-		err := l.PopMode()
-		if err != nil {
-			return nil, err
-		}
-	}
-	if mode, ok := l.spec.Push(mode, tok.ModeKindID); ok {
-		l.PushMode(mode)
-	}
-	// The checking length of the mode stack must be at after pop and push operations because those operations can be performed
-	// at the same time. When the mode stack has just one element and popped it, the mode stack will be temporarily emptied.
-	// However, since a push operation may be performed immediately after it, the lexer allows the stack to be temporarily empty.
-	if len(l.modeStack) == 0 {
-		return nil, fmt.Errorf("a mode stack must have at least one element")
-	}
-	return tok, nil
-}
-
-func (l *Lexer) next() (*Token, error) {
-	mode := l.Mode()
-	state := l.spec.InitialState(mode)
-	buf := []byte{}
-	unfixedBufLen := 0
-	row := l.row
-	col := l.col
-	var tok *Token
-	for {
-		v, eof := l.read()
-		if eof {
-			if tok != nil {
-				l.unread(unfixedBufLen)
-				return tok, nil
-			}
-			// When `buf` has unaccepted data and reads the EOF, the lexer treats the buffered data as an invalid token.
-			if len(buf) > 0 {
-				return &Token{
-					ModeID:     mode,
-					ModeKindID: 0,
-					Lexeme:     buf,
-					Row:        row,
-					Col:        col,
-					Invalid:    true,
-				}, nil
-			}
-			return &Token{
-				ModeID:     mode,
-				ModeKindID: 0,
-				Row:        0,
-				Col:        0,
-				EOF:        true,
-			}, nil
-		}
-		buf = append(buf, v)
-		unfixedBufLen++
-		nextState, ok := l.spec.NextState(mode, state, int(v))
-		if !ok {
-			if tok != nil {
-				l.unread(unfixedBufLen)
-				return tok, nil
-			}
-			return &Token{
-				ModeID:     mode,
-				ModeKindID: 0,
-				Lexeme:     buf,
-				Row:        row,
-				Col:        col,
-				Invalid:    true,
-			}, nil
-		}
-		state = nextState
-		if modeKindID, ok := l.spec.Accept(mode, state); ok {
-			kindID, _ := l.spec.KindIDAndName(mode, modeKindID)
-			tok = &Token{
-				ModeID:     mode,
-				KindID:     kindID,
-				ModeKindID: modeKindID,
-				Lexeme:     buf,
-				Row:        row,
-				Col:        col,
-			}
-			unfixedBufLen = 0
-		}
-	}
-}
-
-// Mode returns the current lex mode.
-func (l *Lexer) Mode() ModeID {
-	return l.modeStack[len(l.modeStack)-1]
-}
-
-// PushMode adds a lex mode onto the mode stack.
-func (l *Lexer) PushMode(mode ModeID) {
-	l.modeStack = append(l.modeStack, mode)
-}
-
-// PopMode removes a lex mode from the top of the mode stack.
-func (l *Lexer) PopMode() error {
-	sLen := len(l.modeStack)
-	if sLen == 0 {
-		return fmt.Errorf("cannot pop a lex mode from a lex mode stack any more")
-	}
-	l.modeStack = l.modeStack[:sLen-1]
-	return nil
-}
-
-func (l *Lexer) read() (byte, bool) {
-	if l.srcPtr >= len(l.src) {
-		return 0, true
-	}
-
-	b := l.src[l.srcPtr]
-	l.srcPtr++
-
-	l.prevRow = l.row
-	l.prevCol = l.col
-
-	// Count the token positions.
-	// The driver treats LF as the end of lines and counts columns in code points, not bytes.
-	// To count in code points, we refer to the First Byte column in the Table 3-6.
-	//
-	// Reference:
-	// - [Table 3-6] https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf > Table 3-6.  UTF-8 Bit Distribution
-	if b < 128 {
-		// 0x0A is LF.
-		if b == 0x0A {
-			l.row++
-			l.col = 0
-		} else {
-			l.col++
-		}
-	} else if b>>5 == 6 || b>>4 == 14 || b>>3 == 30 {
-		l.col++
-	}
-
-	return b, false
-}
-
-// We must not call this function consecutively to record the token position correctly.
-func (l *Lexer) unread(n int) {
-	l.srcPtr -= n
-
-	l.row = l.prevRow
-	l.col = l.prevCol
-}
-
-const (
-	ModeIDNil               ModeID = 0
-	ModeIDDefault           ModeID = 1
-	ModeIDRawString         ModeID = 2
-	ModeIDInterpretedString ModeID = 3
-)
-
-const (
-	ModeNameNil               = ""
-	ModeNameDefault           = "default"
-	ModeNameRawString         = "raw_string"
-	ModeNameInterpretedString = "interpreted_string"
-)
-
-// ModeIDToName converts a mode ID to a name.
-func ModeIDToName(id ModeID) string {
-	switch id {
-	case ModeIDNil:
-		return ModeNameNil
-	case ModeIDDefault:
-		return ModeNameDefault
-	case ModeIDRawString:
-		return ModeNameRawString
-	case ModeIDInterpretedString:
-		return ModeNameInterpretedString
-	}
-	return ""
-}
-
-const (
-	KindIDNil                    KindID = 0
-	KindIDWs                     KindID = 1
-	KindIDLParen                 KindID = 2
-	KindIDRParen                 KindID = 3
-	KindIDIdentifier             KindID = 4
-	KindIDRawStringOpen          KindID = 5
-	KindIDInterpretedStringOpen  KindID = 6
-	KindIDRawStringBody          KindID = 7
-	KindIDRawStringClose         KindID = 8
-	KindIDInterpretedSeq         KindID = 9
-	KindIDCodepointPrefix        KindID = 10
-	KindIDLBrace                 KindID = 11
-	KindIDRBrace                 KindID = 12
-	KindIDHexDigits              KindID = 13
-	KindIDEscapedSeq             KindID = 14
-	KindIDEscapeChar             KindID = 15
-	KindIDInterpretedStringClose KindID = 16
-)
-
-const (
-	KindNameNil                    = ""
-	KindNameWs                     = "ws"
-	KindNameLParen                 = "l_paren"
-	KindNameRParen                 = "r_paren"
-	KindNameIdentifier             = "identifier"
-	KindNameRawStringOpen          = "raw_string_open"
-	KindNameInterpretedStringOpen  = "interpreted_string_open"
-	KindNameRawStringBody          = "raw_string_body"
-	KindNameRawStringClose         = "raw_string_close"
-	KindNameInterpretedSeq         = "interpreted_seq"
-	KindNameCodepointPrefix        = "codepoint_prefix"
-	KindNameLBrace                 = "l_brace"
-	KindNameRBrace                 = "r_brace"
-	KindNameHexDigits              = "hex_digits"
-	KindNameEscapedSeq             = "escaped_seq"
-	KindNameEscapeChar             = "escape_char"
-	KindNameInterpretedStringClose = "interpreted_string_close"
-)
-
-// KindIDToName converts a kind ID to a name.
-func KindIDToName(id KindID) string {
-	switch id {
-	case KindIDNil:
-		return KindNameNil
-	case KindIDWs:
-		return KindNameWs
-	case KindIDLParen:
-		return KindNameLParen
-	case KindIDRParen:
-		return KindNameRParen
-	case KindIDIdentifier:
-		return KindNameIdentifier
-	case KindIDRawStringOpen:
-		return KindNameRawStringOpen
-	case KindIDInterpretedStringOpen:
-		return KindNameInterpretedStringOpen
-	case KindIDRawStringBody:
-		return KindNameRawStringBody
-	case KindIDRawStringClose:
-		return KindNameRawStringClose
-	case KindIDInterpretedSeq:
-		return KindNameInterpretedSeq
-	case KindIDCodepointPrefix:
-		return KindNameCodepointPrefix
-	case KindIDLBrace:
-		return KindNameLBrace
-	case KindIDRBrace:
-		return KindNameRBrace
-	case KindIDHexDigits:
-		return KindNameHexDigits
-	case KindIDEscapedSeq:
-		return KindNameEscapedSeq
-	case KindIDEscapeChar:
-		return KindNameEscapeChar
-	case KindIDInterpretedStringClose:
-		return KindNameInterpretedStringClose
-	}
-	return ""
-}
-
-type lexSpec struct {
-	pop           [][]bool
-	push          [][]ModeID
-	modeNames     []string
-	initialStates []StateID
-	acceptances   [][]ModeKindID
-	kindIDs       [][]KindID
-	kindNames     []string
-	initialModeID ModeID
-	modeIDNil     ModeID
-	modeKindIDNil ModeKindID
-	stateIDNil    StateID
-
-	rowNums           [][]int
-	rowDisplacements  [][]int
-	bounds            [][]int
-	entries           [][]StateID
-	originalColCounts []int
-}
-
-func NewLexSpec() *lexSpec {
-	return &lexSpec{
-		pop: [][]bool{
-			nil,
-			{
-				false, false, false, false, false, false, false,
-			},
-			{
-				false, false, true,
-			},
-			{
-				false, false, false, false, false, false, false, false, true,
-			},
-		},
-		push: [][]ModeID{
-			nil,
-			{
-				0, 0, 0, 0, 0, 2, 3,
-			},
-			{
-				0, 0, 0,
-			},
-			{
-				0, 0, 0, 0, 0, 0, 0, 0, 0,
-			},
-		},
-		modeNames: []string{
-			ModeNameNil,
-			ModeNameDefault,
-			ModeNameRawString,
-			ModeNameInterpretedString,
-		},
-		initialStates: []StateID{
-			0,
-			1,
-			1,
-			1,
-		},
-		acceptances: [][]ModeKindID{
-			nil,
-			{
-				0, 0, 1, 4, 2, 3, 5, 6,
-			},
-			{
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2,
-			},
-			{
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7,
-				5, 2, 3, 4, 6, 8,
-			},
-		},
-		kindIDs: [][]KindID{
-			nil,
-			{
-				KindIDNil,
-				KindIDWs,
-				KindIDLParen,
-				KindIDRParen,
-				KindIDIdentifier,
-				KindIDRawStringOpen,
-				KindIDInterpretedStringOpen,
-			},
-			{
-				KindIDNil,
-				KindIDRawStringBody,
-				KindIDRawStringClose,
-			},
-			{
-				KindIDNil,
-				KindIDInterpretedSeq,
-				KindIDCodepointPrefix,
-				KindIDLBrace,
-				KindIDRBrace,
-				KindIDHexDigits,
-				KindIDEscapedSeq,
-				KindIDEscapeChar,
-				KindIDInterpretedStringClose,
-			},
-		},
-		kindNames: []string{
-			KindNameNil,
-			KindNameWs,
-			KindNameLParen,
-			KindNameRParen,
-			KindNameIdentifier,
-			KindNameRawStringOpen,
-			KindNameInterpretedStringOpen,
-			KindNameRawStringBody,
-			KindNameRawStringClose,
-			KindNameInterpretedSeq,
-			KindNameCodepointPrefix,
-			KindNameLBrace,
-			KindNameRBrace,
-			KindNameHexDigits,
-			KindNameEscapedSeq,
-			KindNameEscapeChar,
-			KindNameInterpretedStringClose,
-		},
-		initialModeID: ModeIDDefault,
-		modeIDNil:     ModeIDNil,
-		modeKindIDNil: 0,
-		stateIDNil:    0,
-
-		rowNums: [][]int{
-			nil,
-			{
-				0, 1, 2, 3, 0, 0, 0, 0,
-			},
-			{
-				0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
-				13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 0,
-			},
-			{
-				0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
-				13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 24,
-				25, 0, 0, 0, 0, 0,
-			},
-		},
-		rowDisplacements: [][]int{
-			nil,
-			{
-				0, 0, 189, 75,
-			},
-			{
-				0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1355, 682, 245, 1259, 746, 1323, 810, 1162, 874,
-				938, 1002, 1371, 1066,
-			},
-			{
-				0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1436, 682, 245, 1259, 746, 1323, 810, 1162, 874,
-				938, 1002, 1452, 1066, 1504, 1435,
-			},
-		},
-		bounds: [][]int{
-			nil,
-			{
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1,
-				1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1,
-				-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, -1, -1, -1, -1, -1, -1, -1,
-				3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-				3, 3, 3, 3, 3, 3, -1, -1, -1, -1, 3, -1, 3, 3, 3, 3, 3, 3, 3, 3,
-				3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2,
-				-1, -1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1,
-			},
-			{
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-				1, 1, 1, 1, 1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, -1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, -1, 2, 2, 2, 2, 2, 2,
-				2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-				2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-				2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 8, 8,
-				8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-				8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-				8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-				8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
-				9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
-				9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
-				9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17,
-				17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
-				17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
-				17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
-				17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
-				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
-				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
-				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23,
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-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
-				31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
-				31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-				8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 23,
-				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
-				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-				27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-				27, 27, 27, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 37,
-				37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0,
-			},
-			{
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 45, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 20, 20,
-				20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 39, 20, 20, 20, 20, 40, 40, 40,
-				40, 40, 40, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 42, 20, 43, 20, 20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2,
-				2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-				2, 2, 2, 2, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 7, 9, 9,
-				11, 14, 14, 14, 17, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 0, 0, 0, 0, 0, 0, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 20, 20,
-				20, 20, 0, 0, 0, 0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 0, 20, 0, 20, 20, 0, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 21,
-				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
-				21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-				24, 24, 26, 28, 28, 30, 33, 33, 33, 36, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-				6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-				10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-				13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-				15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
-				16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
-				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-				25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-				29, 29, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
-				32, 32, 32, 32, 32, 32, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
-				34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
-				35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
-				38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-				12, 12, 12, 12, 12, 12, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
-				31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
-				31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-				4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-				8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 23,
-				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
-				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-				27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-				27, 27, 27, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 0, 0, 0, 0, 0, 0, 0,
-				40, 40, 40, 40, 40, 40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, 40, 40, 40, 40, 40, 44, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
-				37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 44, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			},
-		},
-		originalColCounts: nil,
-	}
-}
-
-func (s *lexSpec) InitialMode() ModeID {
-	return s.initialModeID
-}
-
-func (s *lexSpec) Pop(mode ModeID, modeKind ModeKindID) bool {
-	return s.pop[mode][modeKind]
-}
-
-func (s *lexSpec) Push(mode ModeID, modeKind ModeKindID) (ModeID, bool) {
-	id := s.push[mode][modeKind]
-	return id, id != s.modeIDNil
-}
-
-func (s *lexSpec) ModeName(mode ModeID) string {
-	return s.modeNames[mode]
-}
-
-func (s *lexSpec) InitialState(mode ModeID) StateID {
-	return s.initialStates[mode]
-}
-
-func (s *lexSpec) NextState(mode ModeID, state StateID, v int) (StateID, bool) {
-	rowNum := s.rowNums[mode][state]
-	d := s.rowDisplacements[mode][rowNum]
-	if s.bounds[mode][d+v] != rowNum {
-		return s.stateIDNil, false
-	}
-	return s.entries[mode][d+v], true
-}
-
-func (s *lexSpec) Accept(mode ModeID, state StateID) (ModeKindID, bool) {
-	id := s.acceptances[mode][state]
-	return id, id != s.modeKindIDNil
-}
-
-func (s *lexSpec) KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string) {
-	id := s.kindIDs[mode][modeKind]
-	return id, s.kindNames[id]
-}
diff --git a/spec/test/tree_parser.go b/spec/test/tree_parser.go
deleted file mode 100644
index 528d259..0000000
--- a/spec/test/tree_parser.go
+++ /dev/null
@@ -1,716 +0,0 @@
-// Code generated by vartan-go. DO NOT EDIT.
-package test
-
-import (
-	"fmt"
-	"io"
-)
-
-type Grammar interface {
-	// InitialState returns the initial state of a parser.
-	InitialState() int
-
-	// StartProduction returns the start production of grammar.
-	StartProduction() int
-
-	// Action returns an ACTION entry corresponding to a (state, terminal symbol) pair.
-	Action(state int, terminal int) int
-
-	// GoTo returns a GOTO entry corresponding to a (state, non-terminal symbol) pair.
-	GoTo(state int, lhs int) int
-
-	// ErrorTrapperState returns true when a state can shift the error symbol.
-	ErrorTrapperState(state int) bool
-
-	// LHS returns a LHS symbol of a production.
-	LHS(prod int) int
-
-	// AlternativeSymbolCount returns a symbol count of p production.
-	AlternativeSymbolCount(prod int) int
-
-	// RecoverProduction returns true when a production has the recover directive.
-	RecoverProduction(prod int) bool
-
-	// NonTerminal retuns a string representaion of a non-terminal symbol.
-	NonTerminal(nonTerminal int) string
-
-	// TerminalCount returns a terminal symbol count of grammar.
-	TerminalCount() int
-
-	// SkipTerminal returns true when a terminal symbol must be skipped on syntax analysis.
-	SkipTerminal(terminal int) bool
-
-	// EOF returns the EOF symbol.
-	EOF() int
-
-	// Error returns the error symbol.
-	Error() int
-
-	// Terminal retuns a string representaion of a terminal symbol.
-	Terminal(terminal int) string
-
-	// ASTAction returns an AST action entries.
-	ASTAction(prod int) []int
-}
-
-type VToken interface {
-	// TerminalID returns a terminal ID.
-	TerminalID() int
-
-	// Lexeme returns a lexeme.
-	Lexeme() []byte
-
-	// EOF returns true when a token represents EOF.
-	EOF() bool
-
-	// Invalid returns true when a token is invalid.
-	Invalid() bool
-
-	// Position returns (row, column) pair.
-	Position() (int, int)
-}
-
-type TokenStream interface {
-	Next() (VToken, error)
-}
-
-type SyntaxError struct {
-	Row               int
-	Col               int
-	Message           string
-	Token             VToken
-	ExpectedTerminals []string
-}
-
-type ParserOption func(p *Parser) error
-
-// DisableLAC disables LAC (lookahead correction). LAC is enabled by default.
-func DisableLAC() ParserOption {
-	return func(p *Parser) error {
-		p.disableLAC = true
-		return nil
-	}
-}
-
-func SemanticAction(semAct SemanticActionSet) ParserOption {
-	return func(p *Parser) error {
-		p.semAct = semAct
-		return nil
-	}
-}
-
-type Parser struct {
-	toks       TokenStream
-	gram       Grammar
-	stateStack *stateStack
-	semAct     SemanticActionSet
-	disableLAC bool
-	onError    bool
-	shiftCount int
-	synErrs    []*SyntaxError
-}
-
-func NewParser(toks TokenStream, gram Grammar, opts ...ParserOption) (*Parser, error) {
-	p := &Parser{
-		toks:       toks,
-		gram:       gram,
-		stateStack: &stateStack{},
-	}
-
-	for _, opt := range opts {
-		err := opt(p)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return p, nil
-}
-
-func (p *Parser) Parse() error {
-	p.stateStack.push(p.gram.InitialState())
-	tok, err := p.nextToken()
-	if err != nil {
-		return err
-	}
-
-ACTION_LOOP:
-	for {
-		act := p.lookupAction(tok)
-
-		switch {
-		case act < 0: // Shift
-			nextState := act * -1
-
-			recovered := false
-			if p.onError {
-				p.shiftCount++
-
-				// When the parser performs shift three times, the parser recovers from the error state.
-				if p.shiftCount >= 3 {
-					p.onError = false
-					p.shiftCount = 0
-					recovered = true
-				}
-			}
-
-			p.shift(nextState)
-
-			if p.semAct != nil {
-				p.semAct.Shift(tok, recovered)
-			}
-
-			tok, err = p.nextToken()
-			if err != nil {
-				return err
-			}
-		case act > 0: // Reduce
-			prodNum := act
-
-			recovered := false
-			if p.onError && p.gram.RecoverProduction(prodNum) {
-				p.onError = false
-				p.shiftCount = 0
-				recovered = true
-			}
-
-			accepted := p.reduce(prodNum)
-			if accepted {
-				if p.semAct != nil {
-					p.semAct.Accept()
-				}
-
-				return nil
-			}
-
-			if p.semAct != nil {
-				p.semAct.Reduce(prodNum, recovered)
-			}
-		default: // Error
-			if p.onError {
-				tok, err = p.nextToken()
-				if err != nil {
-					return err
-				}
-				if tok.EOF() {
-					if p.semAct != nil {
-						p.semAct.MissError(tok)
-					}
-
-					return nil
-				}
-
-				continue ACTION_LOOP
-			}
-
-			row, col := tok.Position()
-			p.synErrs = append(p.synErrs, &SyntaxError{
-				Row:               row,
-				Col:               col,
-				Message:           "unexpected token",
-				Token:             tok,
-				ExpectedTerminals: p.searchLookahead(p.stateStack.top()),
-			})
-
-			count, ok := p.trapError()
-			if !ok {
-				if p.semAct != nil {
-					p.semAct.MissError(tok)
-				}
-
-				return nil
-			}
-
-			p.onError = true
-			p.shiftCount = 0
-
-			act, err := p.lookupActionOnError()
-			if err != nil {
-				return err
-			}
-
-			p.shift(act * -1)
-
-			if p.semAct != nil {
-				p.semAct.TrapAndShiftError(tok, count)
-			}
-		}
-	}
-}
-
-// validateLookahead validates whether `term` is a valid lookahead in the current context. When `term` is valid,
-// this method returns `true`.
-func (p *Parser) validateLookahead(term int) bool {
-	p.stateStack.enableExploratoryMode()
-	defer p.stateStack.disableExploratoryMode()
-
-	for {
-		act := p.gram.Action(p.stateStack.topExploratorily(), term)
-
-		switch {
-		case act < 0: // Shift
-			return true
-		case act > 0: // Reduce
-			prodNum := act
-
-			lhs := p.gram.LHS(prodNum)
-			if lhs == p.gram.LHS(p.gram.StartProduction()) {
-				return true
-			}
-			n := p.gram.AlternativeSymbolCount(prodNum)
-			p.stateStack.popExploratorily(n)
-			state := p.gram.GoTo(p.stateStack.topExploratorily(), lhs)
-			p.stateStack.pushExploratorily(state)
-		default: // Error
-			return false
-		}
-	}
-}
-
-func (p *Parser) nextToken() (VToken, error) {
-	for {
-		// We don't have to check whether the token is invalid because the kind ID of the invalid token is 0,
-		// and the parsing table doesn't have an entry corresponding to the kind ID 0. Thus we can detect
-		// a syntax error because the parser cannot find an entry corresponding to the invalid token.
-		tok, err := p.toks.Next()
-		if err != nil {
-			return nil, err
-		}
-
-		if p.gram.SkipTerminal(tok.TerminalID()) {
-			continue
-		}
-
-		return tok, nil
-	}
-}
-
-func (p *Parser) tokenToTerminal(tok VToken) int {
-	if tok.EOF() {
-		return p.gram.EOF()
-	}
-
-	return tok.TerminalID()
-}
-
-func (p *Parser) lookupAction(tok VToken) int {
-	if !p.disableLAC {
-		term := p.tokenToTerminal(tok)
-		if !p.validateLookahead(term) {
-			return 0
-		}
-	}
-
-	return p.gram.Action(p.stateStack.top(), p.tokenToTerminal(tok))
-}
-
-func (p *Parser) lookupActionOnError() (int, error) {
-	act := p.gram.Action(p.stateStack.top(), p.gram.Error())
-	if act >= 0 {
-		return 0, fmt.Errorf("an entry must be a shift action by the error symbol; entry: %v, state: %v, symbol: %v", act, p.stateStack.top(), p.gram.Terminal(p.gram.Error()))
-	}
-
-	return act, nil
-}
-
-func (p *Parser) shift(nextState int) {
-	p.stateStack.push(nextState)
-}
-
-func (p *Parser) reduce(prodNum int) bool {
-	lhs := p.gram.LHS(prodNum)
-	if lhs == p.gram.LHS(p.gram.StartProduction()) {
-		return true
-	}
-	n := p.gram.AlternativeSymbolCount(prodNum)
-	p.stateStack.pop(n)
-	nextState := p.gram.GoTo(p.stateStack.top(), lhs)
-	p.stateStack.push(nextState)
-	return false
-}
-
-func (p *Parser) trapError() (int, bool) {
-	count := 0
-	for {
-		if p.gram.ErrorTrapperState(p.stateStack.top()) {
-			return count, true
-		}
-
-		if p.stateStack.top() != p.gram.InitialState() {
-			p.stateStack.pop(1)
-			count++
-		} else {
-			return 0, false
-		}
-	}
-}
-
-func (p *Parser) SyntaxErrors() []*SyntaxError {
-	return p.synErrs
-}
-
-func (p *Parser) searchLookahead(state int) []string {
-	kinds := []string{}
-	termCount := p.gram.TerminalCount()
-	for term := 0; term < termCount; term++ {
-		if p.disableLAC {
-			if p.gram.Action(p.stateStack.top(), term) == 0 {
-				continue
-			}
-		} else {
-			if !p.validateLookahead(term) {
-				continue
-			}
-		}
-
-		// We don't add the error symbol to the look-ahead symbols because users cannot input the error symbol
-		// intentionally.
-		if term == p.gram.Error() {
-			continue
-		}
-
-		kinds = append(kinds, p.gram.Terminal(term))
-	}
-
-	return kinds
-}
-
-type stateStack struct {
-	items    []int
-	itemsExp []int
-}
-
-func (s *stateStack) enableExploratoryMode() {
-	s.itemsExp = make([]int, len(s.items))
-	copy(s.itemsExp, s.items)
-}
-
-func (s *stateStack) disableExploratoryMode() {
-	s.itemsExp = nil
-}
-
-func (s *stateStack) top() int {
-	return s.items[len(s.items)-1]
-}
-
-func (s *stateStack) topExploratorily() int {
-	return s.itemsExp[len(s.itemsExp)-1]
-}
-
-func (s *stateStack) push(state int) {
-	s.items = append(s.items, state)
-}
-
-func (s *stateStack) pushExploratorily(state int) {
-	s.itemsExp = append(s.itemsExp, state)
-}
-
-func (s *stateStack) pop(n int) {
-	s.items = s.items[:len(s.items)-n]
-}
-
-func (s *stateStack) popExploratorily(n int) {
-	s.itemsExp = s.itemsExp[:len(s.itemsExp)-n]
-}
-
-type grammarImpl struct {
-	recoverProductions      []int
-	action                  []int
-	goTo                    []int
-	alternativeSymbolCounts []int
-	errorTrapperStates      []int
-	nonTerminals            []string
-	lhsSymbols              []int
-	terminals               []string
-	terminalSkip            []int
-	astActions              [][]int
-}
-
-func NewGrammar() *grammarImpl {
-	return &grammarImpl{
-		recoverProductions: []int{
-			0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0,
-		},
-		action: []int{
-			0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			-3, 0, 0, 0, -4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, -5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0,
-			-2, 7, 0, -11, 0, 0, -12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 4,
-			4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 6,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -2, -14, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -15, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 12, 12, 0, 0, -17, 12, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 16, -22, 0, 16, 16, 0, 0, 0, 0, 0, -23,
-			-24, -25, -26, -27, -28, -29, 16, 0, 0, 0, 0, 5, 5, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 3, 0, 0, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -30, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			-31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -23, -24, -25, -26, -27, -28, -29, 15,
-			0, 18, 0, 0, 18, 18, 0, 0, 0, 0, 0, 18, 18, 18, 18, 18, 18, 18, 18, 0,
-			25, 0, 0, 25, 25, 0, 0, 0, 0, 0, 25, 25, 25, 25, 25, 25, 25, 25, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -33, 0, 19, 0,
-			0, 19, 19, 0, 0, 0, 0, 0, 19, 19, 19, 19, 19, 19, 19, 19, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, -34, 0, 0, 0, 0, 0, 0, 20, 0, 0, 20,
-			20, 0, 0, 0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 20, 0, 21, 0, 0, 21, 21,
-			0, 0, 0, 0, 0, 21, 21, 21, 21, 21, 21, 21, 21, 0, 22, 0, 0, 22, 22, 0,
-			0, 0, 0, 0, 22, 22, 22, 22, 22, 22, 22, 22, 0, 23, 0, 0, 23, 23, 0, 0,
-			0, 0, 0, 23, 23, 23, 23, 23, 23, 23, 23, 0, 24, 0, 0, 24, 24, 0, 0, 0,
-			0, 0, 24, 24, 24, 24, 24, 24, 24, 24, 0, 10, 0, 0, 10, 10, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 13, 13, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 17, 0, 0, 17, 17, 0, 0, 0, 0, 0, 17,
-			17, 17, 17, 17, 17, 17, 17, 0, 14, 0, 0, 14, 14, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, -35, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -36,
-			0, 0, 0, 0, 0, 26, 0, 0, 26, 26, 0, 0, 0, 0, 0, 26, 26, 26, 26, 26,
-			26, 26, 26,
-		},
-		goTo: []int{
-			0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 8, 9, 0, 10, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 19, 20, 21, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 21,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0,
-		},
-		alternativeSymbolCounts: []int{
-			0, 1, 4, 4, 3, 2, 1, 0, 1, 1, 3, 1, 0, 3, 3, 1, 0, 2, 1, 1,
-			1, 1, 1, 1, 1, 1, 4,
-		},
-		errorTrapperStates: []int{
-			0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
-			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-		},
-		nonTerminals: []string{
-			"",
-			"tree'",
-			"tree",
-			"tree_list",
-			"string",
-			"raw_string",
-			"opt_raw_string_body",
-			"interpreted_string",
-			"opt_interpreted_string_body",
-			"interpreted_string_body",
-			"interpreted_string_elem",
-			"codepoint_expr",
-		},
-		lhsSymbols: []int{
-			0, 1, 2, 2, 2, 3, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
-			10, 10, 10, 10, 10, 10, 11,
-		},
-		terminals: []string{
-			"",
-			"<eof>",
-			"error",
-			"ws",
-			"l_paren",
-			"r_paren",
-			"identifier",
-			"raw_string_open",
-			"raw_string_body",
-			"raw_string_close",
-			"interpreted_string_open",
-			"interpreted_seq",
-			"codepoint_prefix",
-			"l_brace",
-			"r_brace",
-			"hex_digits",
-			"escaped_seq",
-			"escape_char",
-			"interpreted_string_close",
-		},
-		terminalSkip: []int{
-			0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-		},
-		astActions: [][]int{
-			nil,
-			nil,
-			{
-				2, -3,
-			},
-			{
-				2, 3,
-			},
-			{
-				2,
-			},
-			{
-				-1, 2,
-			},
-			nil,
-			nil,
-			nil,
-			nil,
-			{
-				-2,
-			},
-			nil,
-			nil,
-			{
-				-2,
-			},
-			{
-				2,
-			},
-			{
-				-1,
-			},
-			nil,
-			{
-				-1, -2,
-			},
-			{
-				-1,
-			},
-			nil,
-			nil,
-			nil,
-			nil,
-			nil,
-			nil,
-			nil,
-			{
-				3,
-			},
-		},
-	}
-}
-
-func (g *grammarImpl) InitialState() int {
-	return 0
-}
-
-func (g *grammarImpl) StartProduction() int {
-	return 1
-}
-
-func (g *grammarImpl) RecoverProduction(prod int) bool {
-	return g.recoverProductions[prod] != 0
-}
-
-func (g *grammarImpl) Action(state int, terminal int) int {
-	return g.action[state*19+terminal]
-}
-
-func (g *grammarImpl) GoTo(state int, lhs int) int {
-	return g.goTo[state*12+lhs]
-}
-
-func (g *grammarImpl) AlternativeSymbolCount(prod int) int {
-	return g.alternativeSymbolCounts[prod]
-}
-
-func (g *grammarImpl) TerminalCount() int {
-	return 19
-}
-
-func (g *grammarImpl) SkipTerminal(terminal int) bool {
-	return g.terminalSkip[terminal] == 1
-}
-
-func (g *grammarImpl) ErrorTrapperState(state int) bool {
-	return g.errorTrapperStates[state] != 0
-}
-
-func (g *grammarImpl) NonTerminal(nonTerminal int) string {
-	return g.nonTerminals[nonTerminal]
-}
-
-func (g *grammarImpl) LHS(prod int) int {
-	return g.lhsSymbols[prod]
-}
-
-func (g *grammarImpl) EOF() int {
-	return 1
-}
-
-func (g *grammarImpl) Error() int {
-	return 2
-}
-
-func (g *grammarImpl) Terminal(terminal int) string {
-	return g.terminals[terminal]
-}
-
-func (g *grammarImpl) ASTAction(prod int) []int {
-	return g.astActions[prod]
-}
-
-type vToken struct {
-	terminalID int
-	tok        *Token
-}
-
-func (t *vToken) TerminalID() int {
-	return t.terminalID
-}
-
-func (t *vToken) Lexeme() []byte {
-	return t.tok.Lexeme
-}
-
-func (t *vToken) EOF() bool {
-	return t.tok.EOF
-}
-
-func (t *vToken) Invalid() bool {
-	return t.tok.Invalid
-}
-
-func (t *vToken) Position() (int, int) {
-	return t.tok.Row, t.tok.Col
-}
-
-var kindToTerminal = []int{
-	0, 3, 4, 5, 6, 7, 10, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18,
-}
-
-type tokenStream struct {
-	lex            *Lexer
-	kindToTerminal []int
-}
-
-func NewTokenStream(src io.Reader) (*tokenStream, error) {
-	lex, err := NewLexer(NewLexSpec(), src)
-	if err != nil {
-		return nil, err
-	}
-
-	return &tokenStream{
-		lex: lex,
-	}, nil
-}
-
-func (t *tokenStream) Next() (VToken, error) {
-	tok, err := t.lex.Next()
-	if err != nil {
-		return nil, err
-	}
-	return &vToken{
-		terminalID: kindToTerminal[tok.KindID],
-		tok:        tok,
-	}, nil
-}
diff --git a/spec/test/tree_semantic_action.go b/spec/test/tree_semantic_action.go
deleted file mode 100644
index c1d5a25..0000000
--- a/spec/test/tree_semantic_action.go
+++ /dev/null
@@ -1,367 +0,0 @@
-// Code generated by vartan-go. DO NOT EDIT.
-package test
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"strconv"
-)
-
-// SemanticActionSet is a set of semantic actions a parser calls.
-type SemanticActionSet interface {
-	// Shift runs when the parser shifts a symbol onto a state stack. `tok` is a token corresponding to the symbol.
-	// When the parser recovered from an error state by shifting the token, `recovered` is true.
-	Shift(tok VToken, recovered bool)
-
-	// Reduce runs when the parser reduces an RHS of a production to its LHS. `prodNum` is a number of the production.
-	// When the parser recovered from an error state by reducing the production, `recovered` is true.
-	Reduce(prodNum int, recovered bool)
-
-	// Accept runs when the parser accepts an input.
-	Accept()
-
-	// TrapAndShiftError runs when the parser traps a syntax error and shifts a error symbol onto the state stack.
-	// `cause` is a token that caused a syntax error. `popped` is the number of frames that the parser discards
-	// from the state stack.
-	// Unlike `Shift` function, this function doesn't take a token to be shifted as an argument because a token
-	// corresponding to the error symbol doesn't exist.
-	TrapAndShiftError(cause VToken, popped int)
-
-	// MissError runs when the parser fails to trap a syntax error. `cause` is a token that caused a syntax error.
-	MissError(cause VToken)
-}
-
-var _ SemanticActionSet = &SyntaxTreeActionSet{}
-
-// SyntaxTreeNode is a node of a syntax tree. A node type used in SyntaxTreeActionSet must implement SyntaxTreeNode interface.
-type SyntaxTreeNode interface {
-	// ChildCount returns a child count of a node. A parser calls this method to know the child count to be expanded by an `#ast`
-	// directive with `...` operator.
-	ChildCount() int
-
-	// ExpandChildren returns children of a node. A parser calls this method to fetch the children to be expanded by an `#ast`
-	// directive with `...` operator.
-	ExpandChildren() []SyntaxTreeNode
-}
-
-var _ SyntaxTreeNode = &Node{}
-
-// SyntaxTreeBuilder allows you to construct a syntax tree containing arbitrary user-defined node types.
-// The parser uses SyntaxTreeBuilder interface as a part of semantic actions via SyntaxTreeActionSet interface.
-type SyntaxTreeBuilder interface {
-	Shift(kindName string, text string, row, col int) SyntaxTreeNode
-	ShiftError(kindName string) SyntaxTreeNode
-	Reduce(kindName string, children []SyntaxTreeNode) SyntaxTreeNode
-	Accept(f SyntaxTreeNode)
-}
-
-var _ SyntaxTreeBuilder = &DefaulSyntaxTreeBuilder{}
-
-// DefaulSyntaxTreeBuilder is a implementation of SyntaxTreeBuilder.
-type DefaulSyntaxTreeBuilder struct {
-	tree *Node
-}
-
-// NewDefaultSyntaxTreeBuilder returns a new DefaultSyntaxTreeBuilder.
-func NewDefaultSyntaxTreeBuilder() *DefaulSyntaxTreeBuilder {
-	return &DefaulSyntaxTreeBuilder{}
-}
-
-// Shift is a implementation of SyntaxTreeBuilder.Shift.
-func (b *DefaulSyntaxTreeBuilder) Shift(kindName string, text string, row, col int) SyntaxTreeNode {
-	return &Node{
-		Type:     NodeTypeTerminal,
-		KindName: kindName,
-		Text:     text,
-		Row:      row,
-		Col:      col,
-	}
-}
-
-// ShiftError is a implementation of SyntaxTreeBuilder.ShiftError.
-func (b *DefaulSyntaxTreeBuilder) ShiftError(kindName string) SyntaxTreeNode {
-	return &Node{
-		Type:     NodeTypeError,
-		KindName: kindName,
-	}
-}
-
-// Reduce is a implementation of SyntaxTreeBuilder.Reduce.
-func (b *DefaulSyntaxTreeBuilder) Reduce(kindName string, children []SyntaxTreeNode) SyntaxTreeNode {
-	cNodes := make([]*Node, len(children))
-	for i, c := range children {
-		cNodes[i] = c.(*Node)
-	}
-	return &Node{
-		Type:     NodeTypeNonTerminal,
-		KindName: kindName,
-		Children: cNodes,
-	}
-}
-
-// Accept is a implementation of SyntaxTreeBuilder.Accept.
-func (b *DefaulSyntaxTreeBuilder) Accept(f SyntaxTreeNode) {
-	b.tree = f.(*Node)
-}
-
-// Tree returns a syntax tree when the parser has accepted an input. If a syntax error occurs, the return value is nil.
-func (b *DefaulSyntaxTreeBuilder) Tree() *Node {
-	return b.tree
-}
-
-// SyntaxTreeActionSet is a implementation of SemanticActionSet interface and constructs a syntax tree.
-type SyntaxTreeActionSet struct {
-	gram             Grammar
-	builder          SyntaxTreeBuilder
-	semStack         *semanticStack
-	disableASTAction bool
-}
-
-// NewASTActionSet returns a new SyntaxTreeActionSet that constructs an AST (Abstract Syntax Tree).
-// When grammar `gram` contains `#ast` directives, the new SyntaxTreeActionSet this function returns interprets them.
-func NewASTActionSet(gram Grammar, builder SyntaxTreeBuilder) *SyntaxTreeActionSet {
-	return &SyntaxTreeActionSet{
-		gram:     gram,
-		builder:  builder,
-		semStack: newSemanticStack(),
-	}
-}
-
-// NewCSTTActionSet returns a new SyntaxTreeActionSet that constructs a CST (Concrete Syntax Tree).
-// Even if grammar `gram` contains `#ast` directives, the new SyntaxTreeActionSet this function returns ignores them.
-func NewCSTActionSet(gram Grammar, builder SyntaxTreeBuilder) *SyntaxTreeActionSet {
-	return &SyntaxTreeActionSet{
-		gram:             gram,
-		builder:          builder,
-		semStack:         newSemanticStack(),
-		disableASTAction: true,
-	}
-}
-
-// Shift is a implementation of SemanticActionSet.Shift method.
-func (a *SyntaxTreeActionSet) Shift(tok VToken, recovered bool) {
-	term := a.tokenToTerminal(tok)
-	row, col := tok.Position()
-	a.semStack.push(a.builder.Shift(a.gram.Terminal(term), string(tok.Lexeme()), row, col))
-}
-
-// Reduce is a implementation of SemanticActionSet.Reduce method.
-func (a *SyntaxTreeActionSet) Reduce(prodNum int, recovered bool) {
-	lhs := a.gram.LHS(prodNum)
-
-	// When an alternative is empty, `n` will be 0, and `handle` will be empty slice.
-	n := a.gram.AlternativeSymbolCount(prodNum)
-	handle := a.semStack.pop(n)
-
-	var astAct []int
-	if !a.disableASTAction {
-		astAct = a.gram.ASTAction(prodNum)
-	}
-	var children []SyntaxTreeNode
-	if astAct != nil {
-		// Count the number of children in advance to avoid frequent growth in a slice for children.
-		{
-			l := 0
-			for _, e := range astAct {
-				if e > 0 {
-					l++
-				} else {
-					offset := e*-1 - 1
-					l += handle[offset].ChildCount()
-				}
-			}
-
-			children = make([]SyntaxTreeNode, l)
-		}
-
-		p := 0
-		for _, e := range astAct {
-			if e > 0 {
-				offset := e - 1
-				children[p] = handle[offset]
-				p++
-			} else {
-				offset := e*-1 - 1
-				for _, c := range handle[offset].ExpandChildren() {
-					children[p] = c
-					p++
-				}
-			}
-		}
-	} else {
-		// If an alternative has no AST action, a driver generates
-		// a node with the same structure as a CST.
-		children = handle
-	}
-
-	a.semStack.push(a.builder.Reduce(a.gram.NonTerminal(lhs), children))
-}
-
-// Accept is a implementation of SemanticActionSet.Accept method.
-func (a *SyntaxTreeActionSet) Accept() {
-	top := a.semStack.pop(1)
-	a.builder.Accept(top[0])
-}
-
-// TrapAndShiftError is a implementation of SemanticActionSet.TrapAndShiftError method.
-func (a *SyntaxTreeActionSet) TrapAndShiftError(cause VToken, popped int) {
-	a.semStack.pop(popped)
-	a.semStack.push(a.builder.ShiftError(a.gram.Terminal(a.gram.Error())))
-}
-
-// MissError is a implementation of SemanticActionSet.MissError method.
-func (a *SyntaxTreeActionSet) MissError(cause VToken) {
-}
-
-func (a *SyntaxTreeActionSet) tokenToTerminal(tok VToken) int {
-	if tok.EOF() {
-		return a.gram.EOF()
-	}
-
-	return tok.TerminalID()
-}
-
-type semanticStack struct {
-	frames []SyntaxTreeNode
-}
-
-func newSemanticStack() *semanticStack {
-	return &semanticStack{
-		frames: make([]SyntaxTreeNode, 0, 100),
-	}
-}
-
-func (s *semanticStack) push(f SyntaxTreeNode) {
-	s.frames = append(s.frames, f)
-}
-
-func (s *semanticStack) pop(n int) []SyntaxTreeNode {
-	fs := s.frames[len(s.frames)-n:]
-	s.frames = s.frames[:len(s.frames)-n]
-
-	return fs
-}
-
-type NodeType int
-
-const (
-	NodeTypeError       = 0
-	NodeTypeTerminal    = 1
-	NodeTypeNonTerminal = 2
-)
-
-// Node is a implementation of SyntaxTreeNode interface.
-type Node struct {
-	Type     NodeType
-	KindName string
-	Text     string
-	Row      int
-	Col      int
-	Children []*Node
-}
-
-func (n *Node) MarshalJSON() ([]byte, error) {
-	switch n.Type {
-	case NodeTypeError:
-		return json.Marshal(struct {
-			Type     NodeType `json:"type"`
-			KindName string   `json:"kind_name"`
-		}{
-			Type:     n.Type,
-			KindName: n.KindName,
-		})
-	case NodeTypeTerminal:
-		if n.KindName == "" {
-			return json.Marshal(struct {
-				Type NodeType `json:"type"`
-				Text string   `json:"text"`
-				Row  int      `json:"row"`
-				Col  int      `json:"col"`
-			}{
-				Type: n.Type,
-				Text: n.Text,
-				Row:  n.Row,
-				Col:  n.Col,
-			})
-		}
-		return json.Marshal(struct {
-			Type     NodeType `json:"type"`
-			KindName string   `json:"kind_name"`
-			Text     string   `json:"text"`
-			Row      int      `json:"row"`
-			Col      int      `json:"col"`
-		}{
-			Type:     n.Type,
-			KindName: n.KindName,
-			Text:     n.Text,
-			Row:      n.Row,
-			Col:      n.Col,
-		})
-	case NodeTypeNonTerminal:
-		return json.Marshal(struct {
-			Type     NodeType `json:"type"`
-			KindName string   `json:"kind_name"`
-			Children []*Node  `json:"children"`
-		}{
-			Type:     n.Type,
-			KindName: n.KindName,
-			Children: n.Children,
-		})
-	default:
-		return nil, fmt.Errorf("invalid node type: %v", n.Type)
-	}
-}
-
-// ChildCount is a implementation of SyntaxTreeNode.ChildCount.
-func (n *Node) ChildCount() int {
-	return len(n.Children)
-}
-
-// ExpandChildren is a implementation of SyntaxTreeNode.ExpandChildren.
-func (n *Node) ExpandChildren() []SyntaxTreeNode {
-	fs := make([]SyntaxTreeNode, len(n.Children))
-	for i, n := range n.Children {
-		fs[i] = n
-	}
-	return fs
-}
-
-// PrintTree prints a syntax tree whose root is `node`.
-func PrintTree(w io.Writer, node *Node) {
-	printTree(w, node, "", "")
-}
-
-func printTree(w io.Writer, node *Node, ruledLine string, childRuledLinePrefix string) {
-	if node == nil {
-		return
-	}
-
-	switch node.Type {
-	case NodeTypeError:
-		fmt.Fprintf(w, "%v%v\n", ruledLine, node.KindName)
-	case NodeTypeTerminal:
-		fmt.Fprintf(w, "%v%v %v\n", ruledLine, node.KindName, strconv.Quote(node.Text))
-	case NodeTypeNonTerminal:
-		fmt.Fprintf(w, "%v%v\n", ruledLine, node.KindName)
-
-		num := len(node.Children)
-		for i, child := range node.Children {
-			var line string
-			if num > 1 && i < num-1 {
-				line = "├─ "
-			} else {
-				line = "└─ "
-			}
-
-			var prefix string
-			if i >= num-1 {
-				prefix = "   "
-			} else {
-				prefix = "│  "
-			}
-
-			printTree(w, child, childRuledLinePrefix+line, childRuledLinePrefix+prefix)
-		}
-	}
-}