add boolean data type

config/config.go

@@ -5,12 +5,14 @@ type ConfigType int
 const (
 	SECTION ConfigType = iota
 	INTEGER
+	BOOLEAN
 	FLOAT
 	STRING
 )
 
 var configTypes = [...]string{
 	SECTION: "SECTION",
+	BOOLEAN: "BOOLEAN",
 	INTEGER: "INTEGER",
 	FLOAT:   "FLOAT",
 	STRING:  "STRING",
@@ -34,6 +36,14 @@ type ConfigValue interface {
 	GetValue() interface{}
 }
 
+type BooleanValue struct {
+	Name  string
+	Value bool
+}
+
+func (this BooleanValue) GetType() ConfigType   { return BOOLEAN }
+func (this BooleanValue) GetValue() interface{} { return this.Value }
+
 type IntegerValue struct {
 	Name  string
 	Value int64

example/example.cfg

@@ -3,6 +3,8 @@ master {
   string = "master string value";
   integer = 500;
   float = 80.80;
+  boolean = true;
+  negative = FALSE;
   sub {
       key = "master sub key value";
   }

parser/parser.go

@@ -119,6 +119,15 @@ func (this *Parser) parseSetting(name string) error {
 			Name:  name,
 			Value: this.cur_tok.Literal,
 		}
+	case token.BOOLEAN:
+		bool_val, err := strconv.ParseBool(this.cur_tok.Literal)
+		if err != nil {
+			return nil
+		}
+		value = config.BooleanValue{
+			Name:  name,
+			Value: bool_val,
+		}
 	case token.INTEGER:
 		int_val, err := strconv.ParseInt(this.cur_tok.Literal, 10, 64)
 		if err != nil {

token/tokenid.go

@@ -13,6 +13,7 @@ const (
 	PERIOD
 
 	IDENTIFIER
+	BOOLEAN
 	INTEGER
 	FLOAT
 	STRING
@@ -27,6 +28,7 @@ var tokenNames = [...]string{
 	SEMICOLON:  "SEMICOLON",
 	PERIOD:     "PERIOD",
 	IDENTIFIER: "IDENTIFIER",
+	BOOLEAN:    "BOOLEAN",
 	INTEGER:    "INTEGER",
 	FLOAT:      "FLOAT",
 	STRING:     "STRING",

token/tokenizer.go

@@ -3,6 +3,7 @@ package token
 import (
 	"bufio"
 	"io"
+	"strings"
 )
 
 var eof = rune(0)
@@ -19,6 +20,11 @@ func isWhitespace(ch rune) bool {
 	return (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r')
 }
 
+func isBoolean(str string) bool {
+	lower := strings.ToLower(str)
+	return lower == "true" || lower == "false"
+}
+
 type Tokenizer struct {
 	cur_line int
 	cur_col  int
@@ -71,6 +77,10 @@ func (this *Tokenizer) parseIdentifier() {
 		}
 		this.cur_tok.Literal += string(this.cur_ch)
 	}
+
+	if isBoolean(this.cur_tok.Literal) {
+		this.cur_tok.ID = BOOLEAN
+	}
 }
 
 func (this *Tokenizer) parseNumber() {