diff --git a/go.mod b/go.mod
index 2d677ed..80e8c9d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,8 @@
 module github.com/tamayika/gaq
 
 require (
-	github.com/alecthomas/participle v0.1.1-0.20181115125005-28bd879b3ab5
+	github.com/alecthomas/participle v0.2.0
+	github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3 // indirect
diff --git a/go.sum b/go.sum
index 7d5efce..852d40e 100644
--- a/go.sum
+++ b/go.sum
@@ -2,6 +2,10 @@ github.com/alecthomas/participle v0.1.0 h1:CIpa5JECC7Y8eDoMoDdPmsrfZgSBO0IeCe+2z
 github.com/alecthomas/participle v0.1.0/go.mod h1:UkaznBMzS/FVetZ0dhhxVOiSBDgfLmIYp249zU1w/Z0=
 github.com/alecthomas/participle v0.1.1-0.20181115125005-28bd879b3ab5 h1:xiezf7zOPfxzj607UcJaUukR9KzRDZhce30gO+VIuoI=
 github.com/alecthomas/participle v0.1.1-0.20181115125005-28bd879b3ab5/go.mod h1:SW6HZGeZgSIpcUWX3fXpfZhuaWHnmoD5KCVaqSaNTkk=
+github.com/alecthomas/participle v0.2.0 h1:MBYD61je/vgb5ktXrXth/OdH23fn1lNnT5cZLw3fkh8=
+github.com/alecthomas/participle v0.2.0/go.mod h1:SW6HZGeZgSIpcUWX3fXpfZhuaWHnmoD5KCVaqSaNTkk=
+github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1 h1:GDQdwm/gAcJcLAKQQZGOJ4knlw+7rfEQQcmwTbt4p5E=
+github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
diff --git a/pkg/gaq/query/query.go b/pkg/gaq/query/query.go
index 44e5bf6..256775a 100644
--- a/pkg/gaq/query/query.go
+++ b/pkg/gaq/query/query.go
@@ -12,23 +12,23 @@ import (
 type Query struct {
 	Pos lexer.Position
 
-	Selectors []*Selector `parser:"[ @@ { ',' @@ } ]"`
+	Selectors []*Selector `parser:"( @@ ( ',' @@ )* )?"`
 }
 
-// Selector represents multiple selectors node delimited by comma
+// Selector represents multiple selectors node delimited by space
 type Selector struct {
 	Pos lexer.Position
 
-	SimpleSelectors []*SimpleSelector `parser:"@@ { @@ }"`
+	SimpleSelectors []*SimpleSelector `parser:"@@+"`
 }
 
 // SimpleSelector represents node selector with combinator and options
 type SimpleSelector struct {
 	Pos lexer.Position
 
-	Combinator string                  `parser:"[ @('>' | '+' | '~') ]"`
-	Name       string                  `parser:"[ @(Ident | '*') ]"`
-	Options    []*SimpleSelectorOption `parser:"{ @@ }"`
+	Combinator string                  `parser:"( @('>' | '+' | '~')?"`
+	Name       string                  `parser:"  @(Ident | '*')?"`
+	Options    []*SimpleSelectorOption `parser:"  @@* )!"`
 }
 
 // SimpleSelectorOption represents the option for SimpleSelector
@@ -44,8 +44,8 @@ type Attribute struct {
 	Pos lexer.Position
 
 	Name     string `parser:"@Ident"`
-	Operator string `parser:"[ @('=' | ('~' '=') | ('|' '=') | ('^' '=') | ('$' '=') | ('*' '=')) ]"`
-	Value    string `parser:"[ @(String | String2) ]"`
+	Operator string `parser:"@('=' | ('~' '=') | ('|' '=') | ('^' '=') | ('$' '=') | ('*' '='))?"`
+	Value    string `parser:"@(String | String2)?"`
 }
 
 // Pseudo represents the pseudo option for SimpleSelector
@@ -89,7 +89,7 @@ type PseudoHas struct {
 	Pos lexer.Position
 
 	Name      string      `parser:"'has'"`
-	Selectors []*Selector `parser:"'(' @@ { ',' @@ } ')'"`
+	Selectors []*Selector `parser:"'(' @@ ( ',' @@ )* ')'"`
 }
 
 // PseudoIs represents the is pseudo
@@ -97,7 +97,7 @@ type PseudoIs struct {
 	Pos lexer.Position
 
 	Name      string      `parser:"'is'"`
-	Selectors []*Selector `parser:"'(' @@ { ',' @@ } ')'"`
+	Selectors []*Selector `parser:"'(' @@ ( ',' @@ )* ')'"`
 }
 
 // PseudoLastChild represents the last-child pseudo
@@ -119,7 +119,7 @@ type PseudoNot struct {
 	Pos lexer.Position
 
 	Name      string      `parser:"'not'"`
-	Selectors []*Selector `parser:"'(' @@ { ',' @@ } ')'"`
+	Selectors []*Selector `parser:"'(' @@ ( ',' @@ )* ')'"`
 }
 
 // PseudoRoot represents the root pseudo
diff --git a/pkg/gaq/query/query_test.go b/pkg/gaq/query/query_test.go
index 02f0818..24a8b13 100644
--- a/pkg/gaq/query/query_test.go
+++ b/pkg/gaq/query/query_test.go
@@ -24,8 +24,8 @@ func TestParse(t *testing.T) {
 			},
 			&Query{
 				Pos: lexer.Position{
-					Line:   1,
-					Column: 1,
+					Line:   0,
+					Column: 0,
 				},
 			},
 			false,