Added pragma easyjson:skip to exclude structs from generating stage

It allows manually control which struct should be skipped when using option `-all`.

README.md

@@ -62,7 +62,15 @@ Usage of easyjson:
 ```
 
 Using `-all` will generate marshalers/unmarshalers for all Go structs in the
-file. If `-all` is not provided, then only those structs whose preceding
+file excluding those structs whose preceding comment starts with `easyjson:skip`.
+For example: 
+
+```go
+//easyjson:skip
+type A struct {}
+```
+
+If `-all` is not provided, then only those structs whose preceding
 comment starts with `easyjson:json` will have marshalers/unmarshalers
 generated. For example:
 

parser/parser.go

@@ -8,7 +8,10 @@ import (
 	"strings"
 )
 
-const structComment = "easyjson:json"
+const (
+	structComment     = "easyjson:json"
+	structSkipComment = "easyjson:skip"
+)
 
 type Parser struct {
 	PkgPath     string
@@ -25,6 +28,9 @@ type visitor struct {
 
 func (p *Parser) needType(comments string) bool {
 	for _, v := range strings.Split(comments, "\n") {
+		if strings.HasPrefix(v, structSkipComment) {
+			return false
+		}
 		if strings.HasPrefix(v, structComment) {
 			return true
 		}

tests/basic_test.go

@@ -2,12 +2,11 @@ package tests
 
 import (
 	"bytes"
+	"encoding/json"
 	"net/http/httptest"
 	"reflect"
 	"testing"
 
-	"encoding/json"
-
 	"github.com/mailru/easyjson"
 	"github.com/mailru/easyjson/jwriter"
 )
@@ -253,6 +252,7 @@ func TestDisallowUnknown(t *testing.T) {
 
 var testNotGeneratedTypeCases = []interface{}{
 	TypeNotDeclared{},
+	TypeSkipped{},
 }
 
 func TestMethodsNoGenerated(t *testing.T) {

tests/type_declaration.go

@@ -23,6 +23,11 @@ type (
 	}
 )
 
+//easyjson:skip
+type TypeSkipped struct {
+	Value string
+}
+
 var (
 	myGenDeclaredValue             = TypeDeclared{Value: "GenDeclared"}
 	myGenDeclaredString            = `{"Value":"GenDeclared"}`