Add support for lists

README.md

@@ -35,6 +35,8 @@ primary {
   negative = FALSE
   nothing = NULL
 
+  list = [50.5, true, false, "hello", 'world'];
+
   # Include external files
   include "./include*.cfg";
   # Primary-sub section

forge.go

@@ -14,6 +14,13 @@
 //       secondary_bool = true;
 //       secondary_null = null;
 //
+//       list = [
+//         "any",
+//         'value',
+//         true,
+//         55.5,
+//       ]
+//
 //       # Reference other config value
 //       local_ref = .secondary_null;
 //       global_ref = primary.sub_section.sub_float;
@@ -36,9 +43,10 @@
 //     STRING: ['"] .* ['"]
 //     REFERENCE: (IDENTIFIER)? ('.' IDENTIFIER)+
 //     VALUE: BOOL | NULL | INTEGER | FLOAT | STRING | REFERENCE
+//     LIST: '[' (VALUE | LIST) (',' NEWLINE* (VALUE | LIST))+ ']'
 //
 //     INCLUDE: 'include ' STRING END
-//     DIRECTIVE: (IDENTIFIER '=' VALUE | INCLUDE) END
+//     DIRECTIVE: (IDENTIFIER '=' (VALUE | LIST) | INCLUDE) END
 //     SECTION: IDENTIFIER '{' (DIRECTIVE | SECTION)* '}'
 //     COMMENT: '#' .* '\n'
 //
@@ -57,6 +65,9 @@
 //      The identifiers 'true' or 'false' of any case (e.g. TRUE, True, true, FALSE, False, false)
 //  * Null:
 //      The identifier 'null' of any case (e.g. NULL, Null, null)
+//  * List:
+//      A list value is any number of other values separated by commas and surrounded by brackets.
+//      (e.g. [50.5, 'some', "string", true, false])
 //  * Global reference:
 //      An identifier which may contain periods, the references are resolved from the global
 //      section (e.g. global_value, section.sub_section.value)
@@ -74,7 +85,7 @@
 //      All directives must end in either a semicolon or newline. The value can be any of the types defined above.
 //  * Section:
 //      A section is a grouping of directives under a common name. They are in the format '<section_name> { <directives> }'.
-//      All sections must be wrapped in brackets ('{', '}') and must all have a name. They do not end in a semicolon.
+//      All sections must be wrapped in braces ('{', '}') and must all have a name. They do not end in a semicolon.
 //      Sections may be left empty, they do not have to contain any directives.
 //  * Include:
 //      An include statement tells the config parser to include the contents of another config file where the include

forge_test.go

@@ -26,6 +26,14 @@ primary {
   not_true = FALSE
   nothing = NULL
 
+  list = [
+       TRUE,
+       FALSE,
+       50.5,
+       "hello",
+       'list',
+  ]
+
   # Reference secondary._under (which hasn't been defined yet)
   sec_ref = secondary._under;
    # Primary-sub stuff
@@ -71,6 +79,15 @@ func assertDirectives(values map[string]interface{}, t *testing.T) {
 	assertEqual(primary["nothing"], nil, t)
 	assertEqual(primary["sec_ref"], int64(50), t)
 
+	// Primary list
+	list := primary["list"].([]interface{})
+	assertEqual(len(list), 5, t)
+	assertEqual(list[0], true, t)
+	assertEqual(list[1], false, t)
+	assertEqual(list[2], float64(50.5), t)
+	assertEqual(list[3], "hello", t)
+	assertEqual(list[4], "list", t)
+
 	// Primary Sub
 	sub := primary["sub"].(map[string]interface{})
 	assertEqual(sub["key"], "primary sub key value", t)

list.go

@@ -0,0 +1,153 @@
+package forge
+
+import (
+	"errors"
+	"fmt"
+)
+
+// List struct used for holding data neede for Reference data type
+type List struct {
+	values []Value
+}
+
+// NewList will create and initialize a new List value
+func NewList() *List {
+	return &List{
+		values: make([]Value, 0),
+	}
+}
+
+// GetType will simply return back LIST
+func (list *List) GetType() ValueType {
+	return LIST
+}
+
+// GetValue will resolve and return the value from the underlying list
+// this is necessary to inherit from Value
+func (list *List) GetValue() interface{} {
+	var values []interface{}
+	for _, val := range list.values {
+		values = append(values, val.GetValue())
+	}
+	return values
+}
+
+// GetValues will return back the list of underlygin values
+func (list *List) GetValues() []Value {
+	return list.values
+}
+
+// UpdateValue will set the underlying list value
+func (list *List) UpdateValue(value interface{}) error {
+	// Valid types
+	switch value.(type) {
+	case []Value:
+		list.values = value.([]Value)
+	default:
+		msg := fmt.Sprintf("Unsupported type, %s must be of type []Value", value)
+		return errors.New(msg)
+	}
+	return nil
+}
+
+// Get will return the Value at the index
+func (list *List) Get(idx int) (Value, error) {
+	if idx > list.Length() {
+		return nil, errors.New("index out of range")
+	}
+	return list.values[idx], nil
+}
+
+// GetBoolean will try to get the value stored at the index as a bool
+// will respond with an error if the value does not exist or cannot be converted to a bool
+func (list *List) GetBoolean(idx int) (bool, error) {
+	value, err := list.Get(idx)
+	if err != nil {
+		return false, err
+	}
+
+	switch value.(type) {
+	case *Primative:
+		return value.(*Primative).AsBoolean()
+	}
+
+	return false, errors.New("could not convert unknown value to boolean")
+}
+
+// GetFloat will try to get the value stored at the index as a float64
+// will respond with an error if the value does not exist or cannot be converted to a float64
+func (list *List) GetFloat(idx int) (float64, error) {
+	value, err := list.Get(idx)
+	if err != nil {
+		return float64(0), err
+	}
+
+	switch value.(type) {
+	case *Primative:
+		return value.(*Primative).AsFloat()
+	}
+
+	return float64(0), errors.New("could not convert non-primative value to float")
+}
+
+// GetInteger will try to get the value stored at the index as a int64
+// will respond with an error if the value does not exist or cannot be converted to a int64
+func (list *List) GetInteger(idx int) (int64, error) {
+	value, err := list.Get(idx)
+	if err != nil {
+		return int64(0), err
+	}
+
+	switch value.(type) {
+	case *Primative:
+		return value.(*Primative).AsInteger()
+	}
+
+	return int64(0), errors.New("could not convert non-primative value to integer")
+}
+
+// GetList will try to get the value stored at the index as a List
+// will respond with an error if the value does not exist or is not a List
+func (list *List) GetList(idx int) (*List, error) {
+	value, err := list.Get(idx)
+	if err != nil {
+		return nil, err
+	}
+
+	if value.GetType() == LIST {
+		return value.(*List), nil
+	}
+
+	return nil, errors.New("could not fetch value as list")
+}
+
+// GetString will try to get the value stored at the index as a string
+// will respond with an error if the value does not exist or cannot be converted to a string
+func (list *List) GetString(idx int) (string, error) {
+	value, err := list.Get(idx)
+	if err != nil {
+		return "", err
+	}
+
+	switch value.(type) {
+	case *Primative:
+		return value.(*Primative).AsString()
+	}
+
+	return "", errors.New("could not convert non-primative value to string")
+}
+
+// Set will set the new Value at the index
+func (list *List) Set(idx int, value Value) {
+	list.values[idx] = value
+}
+
+// Append will append a new Value on the end of the internal list
+func (list *List) Append(value Value) {
+	list.values = append(list.values, value)
+}
+
+// Length will return back the total number of items in the list
+func (list *List) Length() int {
+	return len(list.values)
+}

parser.go

@@ -77,6 +77,38 @@ func (parser *Parser) readToken() token.Token {
 	return parser.curTok
 }
 
+func (parser *Parser) skipNewlines() {
+	for parser.curTok.ID == token.NEWLINE {
+		parser.readToken()
+	}
+}
+
+func (parser *Parser) parseList() ([]Value, error) {
+	var values []Value
+	for {
+		parser.skipNewlines()
+
+		value, err := parser.parseSettingValue()
+		if err != nil {
+			return nil, err
+		}
+		values = append(values, value)
+
+		if parser.curTok.ID == token.COMMA {
+			parser.readToken()
+		}
+
+		parser.skipNewlines()
+
+		if parser.curTok.ID == token.RBRACKET {
+			parser.readToken()
+			break
+		}
+	}
+
+	return values, nil
+}
+
 func (parser *Parser) parseReference(startingSection *Section, period bool) (Value, error) {
 	name := ""
 	if period == false {
@@ -112,9 +144,8 @@ func (parser *Parser) parseReference(startingSection *Section, period bool) (Val
 	return NewReference(name, startingSection), nil
 }
 
-func (parser *Parser) parseSetting(name string) error {
+func (parser *Parser) parseSettingValue() (Value, error) {
 	var value Value
-	parser.readToken()
 
 	readNext := true
 	switch parser.curTok.ID {
@@ -123,7 +154,7 @@ func (parser *Parser) parseSetting(name string) error {
 	case token.BOOLEAN:
 		boolVal, err := strconv.ParseBool(parser.curTok.Literal)
 		if err != nil {
-			return nil
+			return value, nil
 		}
 		value = NewBoolean(boolVal)
 	case token.NULL:
@@ -131,31 +162,39 @@ func (parser *Parser) parseSetting(name string) error {
 	case token.INTEGER:
 		intVal, err := strconv.ParseInt(parser.curTok.Literal, 10, 64)
 		if err != nil {
-			return err
+			return value, err
 		}
 		value = NewInteger(intVal)
 	case token.FLOAT:
 		floatVal, err := strconv.ParseFloat(parser.curTok.Literal, 64)
 		if err != nil {
-			return err
+			return value, err
 		}
 		value = NewFloat(floatVal)
 	case token.PERIOD:
 		reference, err := parser.parseReference(parser.curSection, true)
 		if err != nil {
-			return err
+			return value, err
 		}
 		value = reference
 		readNext = false
 	case token.IDENTIFIER:
 		reference, err := parser.parseReference(parser.settings, false)
 		if err != nil {
-			return err
+			return value, err
 		}
 		value = reference
 		readNext = false
+	case token.LBRACKET:
+		parser.readToken()
+		listVal, err := parser.parseList()
+		if err != nil {
+			return value, err
+		}
+		value = NewList()
+		value.UpdateValue(listVal)
 	default:
-		return parser.syntaxError(
+		return value, parser.syntaxError(
 			fmt.Sprintf("expected STRING, INTEGER, FLOAT, BOOLEAN or IDENTIFIER, instead found %s", parser.curTok.ID),
 		)
 	}
@@ -163,6 +202,15 @@ func (parser *Parser) parseSetting(name string) error {
 	if readNext {
 		parser.readToken()
 	}
+	return value, nil
+}
+
+func (parser *Parser) parseSetting(name string) error {
+	parser.readToken()
+	value, err := parser.parseSettingValue()
+	if err != nil {
+		return err
+	}
 	if isSemicolonOrNewline(parser.curTok.ID) == false {
 		msg := fmt.Sprintf("expected ';' or '\n' instead found '%s'", parser.curTok.Literal)
 		return parser.syntaxError(msg)
@@ -247,7 +295,7 @@ func (parser *Parser) parse() error {
 		case token.INCLUDE:
 			parser.parseInclude()
 		case token.IDENTIFIER:
-			if parser.curTok.ID == token.LBRACKET {
+			if parser.curTok.ID == token.LBRACE {
 				err := parser.parseSection(tok.Literal)
 				if err != nil {
 					return err
@@ -259,7 +307,7 @@ func (parser *Parser) parse() error {
 					return err
 				}
 			}
-		case token.RBRACKET:
+		case token.RBRACE:
 			err := parser.endSection()
 			if err != nil {
 				return err

scanner.go

@@ -207,14 +207,20 @@ func (scanner *Scanner) NextToken() token.Token {
 		scanner.readRune()
 		scanner.curTok.Literal = string(ch)
 		switch ch {
+		case ',':
+			scanner.curTok.ID = token.COMMA
 		case '=':
 			scanner.curTok.ID = token.EQUAL
 		case '"', '\'':
 			scanner.parseString(ch)
-		case '{':
+		case '[':
 			scanner.curTok.ID = token.LBRACKET
-		case '}':
+		case ']':
 			scanner.curTok.ID = token.RBRACKET
+		case '{':
+			scanner.curTok.ID = token.LBRACE
+		case '}':
+			scanner.curTok.ID = token.RBRACE
 		case ';':
 			scanner.curTok.ID = token.SEMICOLON
 		case '\n':

section.go

@@ -150,6 +150,21 @@ func (section *Section) GetInteger(name string) (int64, error) {
 	return int64(0), errors.New("could not convert non-primative value to integer")
 }
 
+// GetList will try to get the value stored under name as a List
+// will respond with an error if the value does not exist or is not a List
+func (section *Section) GetList(name string) (*List, error) {
+	value, err := section.Get(name)
+	if err != nil {
+		return nil, err
+	}
+
+	if value.GetType() == LIST {
+		return value.(*List), nil
+	}
+
+	return nil, errors.New("could not fetch value as list")
+}
+
 // GetSection will try to get the value stored under name as a Section
 // will respond with an error if the value does not exist or is not a Section
 func (section *Section) GetSection(name string) (*Section, error) {

test.cfg

@@ -15,6 +15,14 @@ primary {
   not_true = FALSE
   nothing = NULL
 
+  list = [
+       TRUE,
+       FALSE,
+       50.5,
+       "hello",
+       'list',
+  ]
+
   # Reference secondary._under (which hasn't been defined yet)
   sec_ref = secondary._under;
   # Primary-sub stuff

token/token.go

@@ -22,11 +22,14 @@ const (
 	ILLEGAL TokenID = iota
 	EOF
 
+	LBRACE
+	RBRACE
 	LBRACKET
 	RBRACKET
 	EQUAL
 	SEMICOLON
 	NEWLINE
+	COMMA
 	PERIOD
 
 	IDENTIFIER
@@ -42,11 +45,14 @@ const (
 var tokenNames = [...]string{
 	ILLEGAL:    "ILLEGAL",
 	EOF:        "EOF",
+	LBRACE:     "LBRACE",
+	RBRACE:     "RBRACE",
 	LBRACKET:   "LBRACKET",
 	RBRACKET:   "RBRACKET",
 	EQUAL:      "EQUAL",
 	SEMICOLON:  "SEMICOLON",
 	NEWLINE:    "NEWLINE",
+	COMMA:      "COMMA",
 	PERIOD:     "PERIOD",
 	IDENTIFIER: "IDENTIFIER",
 	BOOLEAN:    "BOOLEAN",

value.go

@@ -21,6 +21,8 @@ const (
 	primativesDnd
 
 	complexStart
+	// LIST ValueType
+	LIST
 	// REFERENCE ValueType
 	REFERENCE
 	// SECTION ValueType
@@ -35,6 +37,7 @@ var valueTypes = [...]string{
 	NULL:    "NULL",
 	STRING:  "STRING",
 
+	LIST:      "LIST",
 	REFERENCE: "REFERENCE",
 	SECTION:   "SECTION",
 }