feat/schema: add parser

schema/azschema.bnf

@@ -0,0 +1,40 @@
+string: '`' {.} '`' | '"' {.} '"';
+
+_bin_digit: '0' - '1';
+_oct_digit: _bin_digit | '2' - '7';
+_dec_digit: _oct_digit | '8' - '9';
+_hex_digit: _dec_digit | 'A' - 'F' | 'a' - 'f';
+number: ['-' | '+'] '0' 'b' _bin_digit {_bin_digit | '_'}
+    | ['-' | '+'] '0' 'o' _oct_digit {_oct_digit | '_'}
+    | ['-' | '+'] _dec_digit {_dec_digit | '_'}
+    | ['-' | '+'] '0' 'x' _hex_digit {_hex_digit | '_'};
+
+_name_initial: 'A' - 'Z' | 'a' - 'z' | '_' | '~' | '!' | '@' | '#' | '$' | '%' | '^' | '&' | '*' | '-' | '_' | '+' | '=' | '?' | '/' | '.' | '\'';
+_name_char: _name_initial | _dec_digit;
+name: _name_initial {_name_char};
+
+!whitespace: ' ' | '\t' | '\n' | '\r';
+!comment: ';' {.} '\n';
+
+<<>>
+Schema: ExprList;
+ExprList
+    : Expr
+    | ExprList Expr
+    ;
+ValList
+    : Val
+    | ValList Val
+    ;
+Val
+    : string
+    | number
+    | name
+    | Expr
+    ;
+Expr
+    : "(" name Val Val ")"
+    | "(" name Val ")"
+    | "(" name ")"
+    | "(" "." ValList ")"
+    ;

schema/errors/errors.go

@@ -0,0 +1,108 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package errors
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"unicode"
+
+	"azalea/schema/token"
+)
+
+type ErrorSymbol interface {
+}
+
+type Error struct {
+	Err            error
+	ErrorToken     *token.Token
+	ErrorSymbols   []ErrorSymbol
+	ExpectedTokens []string
+	StackTop       int
+}
+
+func (e *Error) String() string {
+	w := new(strings.Builder)
+	if e.Err != nil {
+		fmt.Fprintln(w, "Error ", e.Err)
+	} else {
+		fmt.Fprintln(w, "Error")
+	}
+	fmt.Fprintf(w, "Token: type=%d, lit=%s\n", e.ErrorToken.Type, e.ErrorToken.Lit)
+	fmt.Fprintf(w, "Pos: offset=%d, line=%d, column=%d\n", e.ErrorToken.Pos.Offset, e.ErrorToken.Pos.Line, e.ErrorToken.Pos.Column)
+	fmt.Fprint(w, "Expected one of: ")
+	for _, sym := range e.ExpectedTokens {
+		fmt.Fprint(w, string(sym), " ")
+	}
+	fmt.Fprintln(w, "ErrorSymbol:")
+	for _, sym := range e.ErrorSymbols {
+		fmt.Fprintf(w, "%v\n", sym)
+	}
+
+	return w.String()
+}
+
+func DescribeExpected(tokens []string) string {
+	switch len(tokens) {
+	case 0:
+		return "unexpected additional tokens"
+
+	case 1:
+		return "expected " + tokens[0]
+
+	case 2:
+		return "expected either " + tokens[0] + " or " + tokens[1]
+
+	case 3:
+		// Oxford-comma rules require more than 3 items in a list for the
+		// comma to appear before the 'or'
+		return fmt.Sprintf("expected one of %s, %s or %s", tokens[0], tokens[1], tokens[2])
+
+	default:
+		// Oxford-comma separated alternatives list.
+		tokens = append(tokens[:len(tokens)-1], "or "+tokens[len(tokens)-1])
+		return "expected one of " + strings.Join(tokens, ", ")
+	}
+}
+
+func DescribeToken(tok *token.Token) string {
+	switch tok.Type {
+	case token.INVALID:
+		return fmt.Sprintf("unknown/invalid token %q", tok.Lit)
+	case token.EOF:
+		return "end-of-file"
+	default:
+		return fmt.Sprintf("%q", tok.Lit)
+	}
+}
+
+func (e *Error) Error() string {
+	// identify the line and column of the error in 'gnu' style so it can be understood
+	// by editors and IDEs; user will need to prefix it with a filename.
+	text := fmt.Sprintf("%d:%d: error: ", e.ErrorToken.Pos.Line, e.ErrorToken.Pos.Column)
+
+	// See if the error token can provide us with the filename.
+	switch src := e.ErrorToken.Pos.Context.(type) {
+	case token.Sourcer:
+		text = src.Source() + ":" + text
+	}
+
+	if e.Err != nil {
+		// Custom error specified, e.g. by << nil, errors.New("missing newline") >>
+		text += e.Err.Error()
+	} else {
+		tokens := make([]string, len(e.ExpectedTokens))
+		for idx, token := range e.ExpectedTokens {
+			if !unicode.IsLetter(rune(token[0])) {
+				token = strconv.Quote(token)
+			}
+			tokens[idx] = token
+		}
+		text += DescribeExpected(tokens)
+		actual := DescribeToken(e.ErrorToken)
+		text += fmt.Sprintf("; got: %s", actual)
+	}
+
+	return text
+}

schema/lexer/acttab.go

@@ -0,0 +1,231 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package lexer
+
+import (
+	"fmt"
+
+	"azalea/schema/token"
+)
+
+type ActionTable [NumStates]ActionRow
+
+type ActionRow struct {
+	Accept token.Type
+	Ignore string
+}
+
+func (a ActionRow) String() string {
+	return fmt.Sprintf("Accept=%d, Ignore=%s", a.Accept, a.Ignore)
+}
+
+var ActTab = ActionTable{
+	ActionRow{ // S0
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S1
+		Accept: -1,
+		Ignore: "!whitespace",
+	},
+	ActionRow{ // S2
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S3
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S4
+		Accept: 5,
+		Ignore: "",
+	},
+	ActionRow{ // S5
+		Accept: 6,
+		Ignore: "",
+	},
+	ActionRow{ // S6
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S7
+		Accept: 7,
+		Ignore: "",
+	},
+	ActionRow{ // S8
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S9
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S10
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S11
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S12
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S13
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S14
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S15
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S16
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S17
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S18
+		Accept: 2,
+		Ignore: "",
+	},
+	ActionRow{ // S19
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S20
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S21
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S22
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S23
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S24
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S25
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S26
+		Accept: 0,
+		Ignore: "",
+	},
+	ActionRow{ // S27
+		Accept: -1,
+		Ignore: "!comment",
+	},
+	ActionRow{ // S28
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S29
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S30
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S31
+		Accept: 4,
+		Ignore: "",
+	},
+	ActionRow{ // S32
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S33
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S34
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S35
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S36
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S37
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S38
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S39
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S40
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S41
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S42
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S43
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S44
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S45
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S46
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S47
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S48
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S49
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S50
+		Accept: 3,
+		Ignore: "",
+	},
+	ActionRow{ // S51
+		Accept: 3,
+		Ignore: "",
+	},
+}

schema/lexer/lexer.go

@@ -0,0 +1,189 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package lexer
+
+import (
+	"os"
+	"unicode/utf8"
+
+	"azalea/schema/token"
+)
+
+const (
+	NoState    = -1
+	NumStates  = 52
+	NumSymbols = 57
+)
+
+type Lexer struct {
+	src     []byte
+	pos     int
+	line    int
+	column  int
+	Context token.Context
+}
+
+func NewLexer(src []byte) *Lexer {
+	lexer := &Lexer{
+		src:     src,
+		pos:     0,
+		line:    1,
+		column:  1,
+		Context: nil,
+	}
+	return lexer
+}
+
+// SourceContext is a simple instance of a token.Context which
+// contains the name of the source file.
+type SourceContext struct {
+	Filepath string
+}
+
+func (s *SourceContext) Source() string {
+	return s.Filepath
+}
+
+func NewLexerFile(fpath string) (*Lexer, error) {
+	src, err := os.ReadFile(fpath)
+	if err != nil {
+		return nil, err
+	}
+	lexer := NewLexer(src)
+	lexer.Context = &SourceContext{Filepath: fpath}
+	return lexer, nil
+}
+
+func (l *Lexer) Scan() (tok *token.Token) {
+	tok = &token.Token{}
+	if l.pos >= len(l.src) {
+		tok.Type = token.EOF
+		tok.Pos.Offset, tok.Pos.Line, tok.Pos.Column = l.pos, l.line, l.column
+		tok.Pos.Context = l.Context
+		return
+	}
+	start, startLine, startColumn, end := l.pos, l.line, l.column, 0
+	tok.Type = token.INVALID
+	state, rune1, size := 0, rune(-1), 0
+	for state != -1 {
+		if l.pos >= len(l.src) {
+			rune1 = -1
+		} else {
+			rune1, size = utf8.DecodeRune(l.src[l.pos:])
+			l.pos += size
+		}
+
+		nextState := -1
+		if rune1 != -1 {
+			nextState = TransTab[state](rune1)
+		}
+		state = nextState
+
+		if state != -1 {
+
+			switch rune1 {
+			case '\n':
+				l.line++
+				l.column = 1
+			case '\r':
+				l.column = 1
+			case '\t':
+				l.column += 4
+			default:
+				l.column++
+			}
+
+			switch {
+			case ActTab[state].Accept != -1:
+				tok.Type = ActTab[state].Accept
+				end = l.pos
+			case ActTab[state].Ignore != "":
+				start, startLine, startColumn = l.pos, l.line, l.column
+				state = 0
+				if start >= len(l.src) {
+					tok.Type = token.EOF
+				}
+
+			}
+		} else {
+			if tok.Type == token.INVALID {
+				end = l.pos
+			}
+		}
+	}
+	if end > start {
+		l.pos = end
+		tok.Lit = l.src[start:end]
+	} else {
+		tok.Lit = []byte{}
+	}
+	tok.Pos.Offset, tok.Pos.Line, tok.Pos.Column = start, startLine, startColumn
+	tok.Pos.Context = l.Context
+
+	return
+}
+
+func (l *Lexer) Reset() {
+	l.pos = 0
+}
+
+/*
+Lexer symbols:
+0: '`'
+1: '`'
+2: '"'
+3: '"'
+4: '-'
+5: '+'
+6: '0'
+7: 'b'
+8: '_'
+9: '-'
+10: '+'
+11: '0'
+12: 'o'
+13: '_'
+14: '-'
+15: '+'
+16: '_'
+17: '-'
+18: '+'
+19: '0'
+20: 'x'
+21: '_'
+22: '('
+23: ')'
+24: '.'
+25: '_'
+26: '~'
+27: '!'
+28: '@'
+29: '#'
+30: '$'
+31: '%'
+32: '^'
+33: '&'
+34: '*'
+35: '-'
+36: '_'
+37: '+'
+38: '='
+39: '?'
+40: '/'
+41: '.'
+42: '''
+43: ' '
+44: '\t'
+45: '\n'
+46: '\r'
+47: ';'
+48: '\n'
+49: '0'-'1'
+50: '2'-'7'
+51: '8'-'9'
+52: 'A'-'F'
+53: 'a'-'f'
+54: 'A'-'Z'
+55: 'a'-'z'
+56: .
+*/

schema/main.go

@@ -1 +1,2 @@
+//go:generate gocc -a azschema.bnf
 package schema

schema/parser/action.go

@@ -0,0 +1,51 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+import (
+	"fmt"
+)
+
+type action interface {
+	act()
+	String() string
+}
+
+type (
+	accept bool
+	shift  int // value is next state index
+	reduce int // value is production index
+)
+
+func (this accept) act() {}
+func (this shift) act()  {}
+func (this reduce) act() {}
+
+func (this accept) Equal(that action) bool {
+	if _, ok := that.(accept); ok {
+		return true
+	}
+	return false
+}
+
+func (this reduce) Equal(that action) bool {
+	that1, ok := that.(reduce)
+	if !ok {
+		return false
+	}
+	return this == that1
+}
+
+func (this shift) Equal(that action) bool {
+	that1, ok := that.(shift)
+	if !ok {
+		return false
+	}
+	return this == that1
+}
+
+func (this accept) String() string { return "accept(0)" }
+func (this shift) String() string  { return fmt.Sprintf("shift:%d", this) }
+func (this reduce) String() string {
+	return fmt.Sprintf("reduce:%d(%s)", this, productionsTable[this].String)
+}

schema/parser/actiontable.go

@@ -0,0 +1,599 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+type (
+	actionTable [numStates]actionRow
+	actionRow   struct {
+		canRecover bool
+		actions    [numSymbols]action
+	}
+)
+
+var actionTab = actionTable{
+	actionRow{ // S0
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,      // INVALID
+			nil,      // ␚
+			nil,      // string
+			nil,      // number
+			nil,      // name
+			shift(4), // (
+			nil,      // )
+			nil,      // .
+		},
+	},
+	actionRow{ // S1
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,          // INVALID
+			accept(true), // ␚
+			nil,          // string
+			nil,          // number
+			nil,          // name
+			nil,          // (
+			nil,          // )
+			nil,          // .
+		},
+	},
+	actionRow{ // S2
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			reduce(1), // ␚, reduce: Schema
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			shift(4),  // (
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S3
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			reduce(2), // ␚, reduce: ExprList
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			reduce(2), // (, reduce: ExprList
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S4
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,      // INVALID
+			nil,      // ␚
+			nil,      // string
+			nil,      // number
+			shift(6), // name
+			nil,      // (
+			nil,      // )
+			shift(7), // .
+		},
+	},
+	actionRow{ // S5
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			reduce(3), // ␚, reduce: ExprList
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			reduce(3), // (, reduce: ExprList
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S6
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(14), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S7
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S8
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(9), // string, reduce: Val
+			reduce(9), // number, reduce: Val
+			reduce(9), // name, reduce: Val
+			reduce(9), // (, reduce: Val
+			reduce(9), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S9
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(19), // string
+			shift(20), // number
+			shift(21), // name
+			shift(22), // (
+			shift(23), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S10
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(6), // string, reduce: Val
+			reduce(6), // number, reduce: Val
+			reduce(6), // name, reduce: Val
+			reduce(6), // (, reduce: Val
+			reduce(6), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S11
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(7), // string, reduce: Val
+			reduce(7), // number, reduce: Val
+			reduce(7), // name, reduce: Val
+			reduce(7), // (, reduce: Val
+			reduce(7), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S12
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(8), // string, reduce: Val
+			reduce(8), // number, reduce: Val
+			reduce(8), // name, reduce: Val
+			reduce(8), // (, reduce: Val
+			reduce(8), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S13
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			shift(24), // name
+			nil,       // (
+			nil,       // )
+			shift(25), // .
+		},
+	},
+	actionRow{ // S14
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			reduce(12), // ␚, reduce: Expr
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			reduce(12), // (, reduce: Expr
+			nil,        // )
+			nil,        // .
+		},
+	},
+	actionRow{ // S15
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(27), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S16
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(4), // string, reduce: ValList
+			reduce(4), // number, reduce: ValList
+			reduce(4), // name, reduce: ValList
+			reduce(4), // (, reduce: ValList
+			reduce(4), // ), reduce: ValList
+			nil,       // .
+		},
+	},
+	actionRow{ // S17
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			reduce(9), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S18
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			shift(28), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S19
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			reduce(6), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S20
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			reduce(7), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S21
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			reduce(8), // ), reduce: Val
+			nil,       // .
+		},
+	},
+	actionRow{ // S22
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			shift(29), // name
+			nil,       // (
+			nil,       // )
+			shift(30), // .
+		},
+	},
+	actionRow{ // S23
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			reduce(11), // ␚, reduce: Expr
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			reduce(11), // (, reduce: Expr
+			nil,        // )
+			nil,        // .
+		},
+	},
+	actionRow{ // S24
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(32), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S25
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S26
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			reduce(5), // string, reduce: ValList
+			reduce(5), // number, reduce: ValList
+			reduce(5), // name, reduce: ValList
+			reduce(5), // (, reduce: ValList
+			reduce(5), // ), reduce: ValList
+			nil,       // .
+		},
+	},
+	actionRow{ // S27
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			reduce(13), // ␚, reduce: Expr
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			reduce(13), // (, reduce: Expr
+			nil,        // )
+			nil,        // .
+		},
+	},
+	actionRow{ // S28
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			reduce(10), // ␚, reduce: Expr
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			reduce(10), // (, reduce: Expr
+			nil,        // )
+			nil,        // .
+		},
+	},
+	actionRow{ // S29
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(35), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S30
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			nil,       // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S31
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(19), // string
+			shift(20), // number
+			shift(21), // name
+			shift(22), // (
+			shift(38), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S32
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			reduce(12), // string, reduce: Expr
+			reduce(12), // number, reduce: Expr
+			reduce(12), // name, reduce: Expr
+			reduce(12), // (, reduce: Expr
+			reduce(12), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S33
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(39), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S34
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(19), // string
+			shift(20), // number
+			shift(21), // name
+			shift(22), // (
+			shift(41), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S35
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			nil,        // (
+			reduce(12), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S36
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			shift(10), // string
+			shift(11), // number
+			shift(12), // name
+			shift(13), // (
+			shift(42), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S37
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			shift(43), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S38
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			reduce(11), // string, reduce: Expr
+			reduce(11), // number, reduce: Expr
+			reduce(11), // name, reduce: Expr
+			reduce(11), // (, reduce: Expr
+			reduce(11), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S39
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			reduce(13), // string, reduce: Expr
+			reduce(13), // number, reduce: Expr
+			reduce(13), // name, reduce: Expr
+			reduce(13), // (, reduce: Expr
+			reduce(13), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S40
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,       // INVALID
+			nil,       // ␚
+			nil,       // string
+			nil,       // number
+			nil,       // name
+			nil,       // (
+			shift(44), // )
+			nil,       // .
+		},
+	},
+	actionRow{ // S41
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			nil,        // (
+			reduce(11), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S42
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			nil,        // (
+			reduce(13), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S43
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			reduce(10), // string, reduce: Expr
+			reduce(10), // number, reduce: Expr
+			reduce(10), // name, reduce: Expr
+			reduce(10), // (, reduce: Expr
+			reduce(10), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+	actionRow{ // S44
+		canRecover: false,
+		actions: [numSymbols]action{
+			nil,        // INVALID
+			nil,        // ␚
+			nil,        // string
+			nil,        // number
+			nil,        // name
+			nil,        // (
+			reduce(10), // ), reduce: Expr
+			nil,        // .
+		},
+	},
+}

schema/parser/context.go

@@ -0,0 +1,7 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+// Parser-specific user-defined and entirely-optional context,
+// accessible as '$Context' in SDT actions.
+type Context interface{}

schema/parser/gototable.go

@@ -0,0 +1,373 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+const numNTSymbols = 6
+
+type (
+	gotoTable [numStates]gotoRow
+	gotoRow   [numNTSymbols]int
+)
+
+var gotoTab = gotoTable{
+	gotoRow{ // S0
+		-1, // S'
+		1,  // Schema
+		2,  // ExprList
+		-1, // ValList
+		-1, // Val
+		3,  // Expr
+	},
+	gotoRow{ // S1
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S2
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		5,  // Expr
+	},
+	gotoRow{ // S3
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S4
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S5
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S6
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		9,  // Val
+		8,  // Expr
+	},
+	gotoRow{ // S7
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		15, // ValList
+		16, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S8
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S9
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		18, // Val
+		17, // Expr
+	},
+	gotoRow{ // S10
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S11
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S12
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S13
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S14
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S15
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		26, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S16
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S17
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S18
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S19
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S20
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S21
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S22
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S23
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S24
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		31, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S25
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		33, // ValList
+		16, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S26
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S27
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S28
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S29
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		34, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S30
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		36, // ValList
+		16, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S31
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		37, // Val
+		17, // Expr
+	},
+	gotoRow{ // S32
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S33
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		26, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S34
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		40, // Val
+		17, // Expr
+	},
+	gotoRow{ // S35
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S36
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		26, // Val
+		8,  // Expr
+	},
+	gotoRow{ // S37
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S38
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S39
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S40
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S41
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S42
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S43
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+	gotoRow{ // S44
+		-1, // S'
+		-1, // Schema
+		-1, // ExprList
+		-1, // ValList
+		-1, // Val
+		-1, // Expr
+	},
+}

schema/parser/parser.go

@@ -0,0 +1,217 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+import (
+	"fmt"
+	"strings"
+
+	parseError "azalea/schema/errors"
+	"azalea/schema/token"
+)
+
+const (
+	numProductions = 14
+	numStates      = 45
+	numSymbols     = 14
+)
+
+// Stack
+
+type stack struct {
+	state  []int
+	attrib []Attrib
+}
+
+const iNITIAL_STACK_SIZE = 100
+
+func newStack() *stack {
+	return &stack{
+		state:  make([]int, 0, iNITIAL_STACK_SIZE),
+		attrib: make([]Attrib, 0, iNITIAL_STACK_SIZE),
+	}
+}
+
+func (s *stack) reset() {
+	s.state = s.state[:0]
+	s.attrib = s.attrib[:0]
+}
+
+func (s *stack) push(state int, a Attrib) {
+	s.state = append(s.state, state)
+	s.attrib = append(s.attrib, a)
+}
+
+func (s *stack) top() int {
+	return s.state[len(s.state)-1]
+}
+
+func (s *stack) peek(pos int) int {
+	return s.state[pos]
+}
+
+func (s *stack) topIndex() int {
+	return len(s.state) - 1
+}
+
+func (s *stack) popN(items int) []Attrib {
+	lo, hi := len(s.state)-items, len(s.state)
+
+	attrib := s.attrib[lo:hi]
+
+	s.state = s.state[:lo]
+	s.attrib = s.attrib[:lo]
+
+	return attrib
+}
+
+func (s *stack) String() string {
+	w := new(strings.Builder)
+	fmt.Fprintf(w, "stack:\n")
+	for i, st := range s.state {
+		fmt.Fprintf(w, "\t%d: %d , ", i, st)
+		if s.attrib[i] == nil {
+			fmt.Fprintf(w, "nil")
+		} else {
+			switch attr := s.attrib[i].(type) {
+			case *token.Token:
+				fmt.Fprintf(w, "%s", attr.Lit)
+			default:
+				fmt.Fprintf(w, "%v", attr)
+			}
+		}
+		fmt.Fprintf(w, "\n")
+	}
+	return w.String()
+}
+
+// Parser
+
+type Parser struct {
+	stack     *stack
+	nextToken *token.Token
+	pos       int
+	Context   Context
+}
+
+type Scanner interface {
+	Scan() (tok *token.Token)
+}
+
+func NewParser() *Parser {
+	p := &Parser{stack: newStack()}
+	p.Reset()
+	return p
+}
+
+func (p *Parser) Reset() {
+	p.stack.reset()
+	p.stack.push(0, nil)
+}
+
+func (p *Parser) Error(err error, scanner Scanner) (recovered bool, errorAttrib *parseError.Error) {
+	errorAttrib = &parseError.Error{
+		Err:            err,
+		ErrorToken:     p.nextToken,
+		ErrorSymbols:   p.popNonRecoveryStates(),
+		ExpectedTokens: make([]string, 0, 8),
+	}
+	for t, action := range actionTab[p.stack.top()].actions {
+		if action != nil {
+			errorAttrib.ExpectedTokens = append(errorAttrib.ExpectedTokens, token.TokMap.Id(token.Type(t)))
+		}
+	}
+
+	if action := actionTab[p.stack.top()].actions[token.TokMap.Type("error")]; action != nil {
+		p.stack.push(int(action.(shift)), errorAttrib) // action can only be shift
+	} else {
+		return
+	}
+
+	if action := actionTab[p.stack.top()].actions[p.nextToken.Type]; action != nil {
+		recovered = true
+	}
+	for !recovered && p.nextToken.Type != token.EOF {
+		p.nextToken = scanner.Scan()
+		if action := actionTab[p.stack.top()].actions[p.nextToken.Type]; action != nil {
+			recovered = true
+		}
+	}
+
+	return
+}
+
+func (p *Parser) popNonRecoveryStates() (removedAttribs []parseError.ErrorSymbol) {
+	if rs, ok := p.firstRecoveryState(); ok {
+		errorSymbols := p.stack.popN(p.stack.topIndex() - rs)
+		removedAttribs = make([]parseError.ErrorSymbol, len(errorSymbols))
+		for i, e := range errorSymbols {
+			removedAttribs[i] = e
+		}
+	} else {
+		removedAttribs = []parseError.ErrorSymbol{}
+	}
+	return
+}
+
+// recoveryState points to the highest state on the stack, which can recover
+func (p *Parser) firstRecoveryState() (recoveryState int, canRecover bool) {
+	recoveryState, canRecover = p.stack.topIndex(), actionTab[p.stack.top()].canRecover
+	for recoveryState > 0 && !canRecover {
+		recoveryState--
+		canRecover = actionTab[p.stack.peek(recoveryState)].canRecover
+	}
+	return
+}
+
+func (p *Parser) newError(err error) error {
+	e := &parseError.Error{
+		Err:        err,
+		StackTop:   p.stack.top(),
+		ErrorToken: p.nextToken,
+	}
+	actRow := actionTab[p.stack.top()]
+	for i, t := range actRow.actions {
+		if t != nil {
+			e.ExpectedTokens = append(e.ExpectedTokens, token.TokMap.Id(token.Type(i)))
+		}
+	}
+	return e
+}
+
+func (p *Parser) Parse(scanner Scanner) (res interface{}, err error) {
+	p.Reset()
+	p.nextToken = scanner.Scan()
+	for acc := false; !acc; {
+		action := actionTab[p.stack.top()].actions[p.nextToken.Type]
+		if action == nil {
+			if recovered, errAttrib := p.Error(nil, scanner); !recovered {
+				p.nextToken = errAttrib.ErrorToken
+				return nil, p.newError(nil)
+			}
+			if action = actionTab[p.stack.top()].actions[p.nextToken.Type]; action == nil {
+				panic("Error recovery led to invalid action")
+			}
+		}
+
+		switch act := action.(type) {
+		case accept:
+			res = p.stack.popN(1)[0]
+			acc = true
+		case shift:
+			p.stack.push(int(act), p.nextToken)
+			p.nextToken = scanner.Scan()
+		case reduce:
+			prod := productionsTable[int(act)]
+			attrib, err := prod.ReduceFunc(p.stack.popN(prod.NumSymbols), p.Context)
+			if err != nil {
+				return nil, p.newError(err)
+			} else {
+				p.stack.push(gotoTab[p.stack.top()][prod.NTType], attrib)
+			}
+		default:
+			panic("unknown action: " + action.String())
+		}
+	}
+	return res, nil
+}

schema/parser/productionstable.go

@@ -0,0 +1,160 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package parser
+
+type (
+	ProdTab      [numProductions]ProdTabEntry
+	ProdTabEntry struct {
+		String     string
+		Id         string
+		NTType     int
+		Index      int
+		NumSymbols int
+		ReduceFunc func([]Attrib, interface{}) (Attrib, error)
+	}
+	Attrib interface {
+	}
+)
+
+var productionsTable = ProdTab{
+	ProdTabEntry{
+		String:     `S' : Schema	<<  >>`,
+		Id:         "S'",
+		NTType:     0,
+		Index:      0,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Schema : ExprList	<<  >>`,
+		Id:         "Schema",
+		NTType:     1,
+		Index:      1,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `ExprList : Expr	<<  >>`,
+		Id:         "ExprList",
+		NTType:     2,
+		Index:      2,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `ExprList : ExprList Expr	<<  >>`,
+		Id:         "ExprList",
+		NTType:     2,
+		Index:      3,
+		NumSymbols: 2,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `ValList : Val	<<  >>`,
+		Id:         "ValList",
+		NTType:     3,
+		Index:      4,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `ValList : ValList Val	<<  >>`,
+		Id:         "ValList",
+		NTType:     3,
+		Index:      5,
+		NumSymbols: 2,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Val : string	<<  >>`,
+		Id:         "Val",
+		NTType:     4,
+		Index:      6,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Val : number	<<  >>`,
+		Id:         "Val",
+		NTType:     4,
+		Index:      7,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Val : name	<<  >>`,
+		Id:         "Val",
+		NTType:     4,
+		Index:      8,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Val : Expr	<<  >>`,
+		Id:         "Val",
+		NTType:     4,
+		Index:      9,
+		NumSymbols: 1,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Expr : "(" name Val Val ")"	<<  >>`,
+		Id:         "Expr",
+		NTType:     5,
+		Index:      10,
+		NumSymbols: 5,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Expr : "(" name Val ")"	<<  >>`,
+		Id:         "Expr",
+		NTType:     5,
+		Index:      11,
+		NumSymbols: 4,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Expr : "(" name ")"	<<  >>`,
+		Id:         "Expr",
+		NTType:     5,
+		Index:      12,
+		NumSymbols: 3,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+	ProdTabEntry{
+		String:     `Expr : "(" "." ValList ")"	<<  >>`,
+		Id:         "Expr",
+		NTType:     5,
+		Index:      13,
+		NumSymbols: 4,
+		ReduceFunc: func(X []Attrib, C interface{}) (Attrib, error) {
+			return X[0], nil
+		},
+	},
+}

schema/token/context.go

@@ -0,0 +1,14 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package token
+
+// Context allows user-defined data to be associated with the
+// lexer/scanner to be associated with each token that lexer
+// produces.
+type Context interface{}
+
+// Sourcer is a Context interface which presents a Source() method
+// identifying e.g the filename for the current code.
+type Sourcer interface {
+	Source() string
+}

schema/token/token.go

@@ -0,0 +1,159 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package token
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"unicode/utf8"
+)
+
+type Token struct {
+	Type
+	Lit []byte
+	Pos
+}
+
+type Type int
+
+const (
+	INVALID Type = iota
+	EOF
+)
+
+type Pos struct {
+	Offset  int
+	Line    int
+	Column  int
+	Context Context
+}
+
+func (p Pos) String() string {
+	// If the context provides a filename, provide a human-readable File:Line:Column representation.
+	switch src := p.Context.(type) {
+	case Sourcer:
+		return fmt.Sprintf("%s:%d:%d", src.Source(), p.Line, p.Column)
+	default:
+		return fmt.Sprintf("Pos(offset=%d, line=%d, column=%d)", p.Offset, p.Line, p.Column)
+	}
+}
+
+type TokenMap struct {
+	typeMap []string
+	idMap   map[string]Type
+}
+
+func (m TokenMap) Id(tok Type) string {
+	if int(tok) < len(m.typeMap) {
+		return m.typeMap[tok]
+	}
+	return "unknown"
+}
+
+func (m TokenMap) Type(tok string) Type {
+	if typ, exist := m.idMap[tok]; exist {
+		return typ
+	}
+	return INVALID
+}
+
+func (m TokenMap) TokenString(tok *Token) string {
+	return fmt.Sprintf("%s(%d,%s)", m.Id(tok.Type), tok.Type, tok.Lit)
+}
+
+func (m TokenMap) StringType(typ Type) string {
+	return fmt.Sprintf("%s(%d)", m.Id(typ), typ)
+}
+
+// Equals returns returns true if the token Type and Lit are matches.
+func (t *Token) Equals(rhs interface{}) bool {
+	switch rhsT := rhs.(type) {
+	case *Token:
+		return t == rhsT || (t.Type == rhsT.Type && bytes.Equal(t.Lit, rhsT.Lit))
+	default:
+		return false
+	}
+}
+
+// CharLiteralValue returns the string value of the char literal.
+func (t *Token) CharLiteralValue() string {
+	return string(t.Lit[1 : len(t.Lit)-1])
+}
+
+// Float32Value returns the float32 value of the token or an error if the token literal does not
+// denote a valid float32.
+func (t *Token) Float32Value() (float32, error) {
+	if v, err := strconv.ParseFloat(string(t.Lit), 32); err != nil {
+		return 0, err
+	} else {
+		return float32(v), nil
+	}
+}
+
+// Float64Value returns the float64 value of the token or an error if the token literal does not
+// denote a valid float64.
+func (t *Token) Float64Value() (float64, error) {
+	return strconv.ParseFloat(string(t.Lit), 64)
+}
+
+// IDValue returns the string representation of an identifier token.
+func (t *Token) IDValue() string {
+	return string(t.Lit)
+}
+
+// Int32Value returns the int32 value of the token or an error if the token literal does not
+// denote a valid float64.
+func (t *Token) Int32Value() (int32, error) {
+	if v, err := strconv.ParseInt(string(t.Lit), 10, 64); err != nil {
+		return 0, err
+	} else {
+		return int32(v), nil
+	}
+}
+
+// Int64Value returns the int64 value of the token or an error if the token literal does not
+// denote a valid float64.
+func (t *Token) Int64Value() (int64, error) {
+	return strconv.ParseInt(string(t.Lit), 10, 64)
+}
+
+// UTF8Rune decodes the UTF8 rune in the token literal. It returns utf8.RuneError if
+// the token literal contains an invalid rune.
+func (t *Token) UTF8Rune() (rune, error) {
+	r, _ := utf8.DecodeRune(t.Lit)
+	if r == utf8.RuneError {
+		err := fmt.Errorf("Invalid rune")
+		return r, err
+	}
+	return r, nil
+}
+
+// StringValue returns the string value of the token literal.
+func (t *Token) StringValue() string {
+	return string(t.Lit[1 : len(t.Lit)-1])
+}
+
+var TokMap = TokenMap{
+	typeMap: []string{
+		"INVALID",
+		"␚",
+		"string",
+		"number",
+		"name",
+		"(",
+		")",
+		".",
+	},
+
+	idMap: map[string]Type{
+		"INVALID": 0,
+		"␚":       1,
+		"string":  2,
+		"number":  3,
+		"name":    4,
+		"(":       5,
+		")":       6,
+		".":       7,
+	},
+}

schema/util/litconv.go

@@ -0,0 +1,101 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package util
+
+import (
+	"fmt"
+	"strconv"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Interface.
+
+// RuneValue will convert the literal value of a scanned token to a rune.
+func RuneValue(lit []byte) rune {
+	if lit[1] == '\\' {
+		return escapeCharVal(lit)
+	}
+	r, size := utf8.DecodeRune(lit[1:])
+	if size != len(lit)-2 {
+		panic(fmt.Sprintf("Error decoding rune. Lit: %s, rune: %d, size%d\n", lit, r, size))
+	}
+	return r
+}
+
+// UintValue will attempt to parse a byte-slice as a signed base-10 64-bit integer.
+func IntValue(lit []byte) (int64, error) {
+	return strconv.ParseInt(string(lit), 10, 64)
+}
+
+// UintValue will attempt to parse a byte-slice as an unsigned base-10 64-bit integer.
+func UintValue(lit []byte) (uint64, error) {
+	return strconv.ParseUint(string(lit), 10, 64)
+}
+
+// Helpers.
+func escapeCharVal(lit []byte) rune {
+	var i, base, max uint32
+	offset := 2
+	switch lit[offset] {
+	case 'a':
+		return '\a'
+	case 'b':
+		return '\b'
+	case 'f':
+		return '\f'
+	case 'n':
+		return '\n'
+	case 'r':
+		return '\r'
+	case 't':
+		return '\t'
+	case 'v':
+		return '\v'
+	case '\\':
+		return '\\'
+	case '\'':
+		return '\''
+	case '0', '1', '2', '3', '4', '5', '6', '7':
+		i, base, max = 3, 8, 255
+	case 'x':
+		i, base, max = 2, 16, 255
+		offset++
+	case 'u':
+		i, base, max = 4, 16, unicode.MaxRune
+		offset++
+	case 'U':
+		i, base, max = 8, 16, unicode.MaxRune
+		offset++
+	default:
+		panic(fmt.Sprintf("Error decoding character literal: %s\n", lit))
+	}
+
+	var x uint32
+	for ; i > 0 && offset < len(lit)-1; i-- {
+		ch, size := utf8.DecodeRune(lit[offset:])
+		offset += size
+		d := uint32(digitVal(ch))
+		if d >= base {
+			panic(fmt.Sprintf("charVal(%s): illegal character (%c) in escape sequence. size=%d, offset=%d", lit, ch, size, offset))
+		}
+		x = x*base + d
+	}
+	if x > max || 0xD800 <= x && x < 0xE000 {
+		panic(fmt.Sprintf("Error decoding escape char value. Lit:%s, offset:%d, escape sequence is invalid Unicode code point\n", lit, offset))
+	}
+
+	return rune(x)
+}
+
+func digitVal(ch rune) int {
+	switch {
+	case '0' <= ch && ch <= '9':
+		return int(ch) - '0'
+	case 'a' <= ch && ch <= 'f':
+		return int(ch) - 'a' + 10
+	case 'A' <= ch && ch <= 'F':
+		return int(ch) - 'A' + 10
+	}
+	return 16 // larger than any legal digit val
+}

schema/util/rune.go

@@ -0,0 +1,39 @@
+// Code generated by gocc; DO NOT EDIT.
+
+package util
+
+import (
+	"fmt"
+)
+
+func RuneToString(r rune) string {
+	if r >= 0x20 && r < 0x7f {
+		return fmt.Sprintf("'%c'", r)
+	}
+	switch r {
+	case 0x07:
+		return "'\\a'"
+	case 0x08:
+		return "'\\b'"
+	case 0x0C:
+		return "'\\f'"
+	case 0x0A:
+		return "'\\n'"
+	case 0x0D:
+		return "'\\r'"
+	case 0x09:
+		return "'\\t'"
+	case 0x0b:
+		return "'\\v'"
+	case 0x5c:
+		return "'\\\\\\'"
+	case 0x27:
+		return "'\\''"
+	case 0x22:
+		return "'\\\"'"
+	}
+	if r < 0x10000 {
+		return fmt.Sprintf("\\u%04x", r)
+	}
+	return fmt.Sprintf("\\U%08x", r)
+}