fix

Readme update for alternative string values flag

.travis.yml

@@ -4,9 +4,8 @@ matrix:
   allow_failures:
   - go: master
   include:
-  - go: 1.12.x
+  - go: 1.17.x
-  - go: 1.13.x
+  - go: 1.18.x
-  - go: master
 env:
   global:
   - GO111MODULE=on
@@ -21,9 +20,10 @@ deploy:
   file:
   - cli/build/enumer.linux-amd64.tar.gz
   - cli/build/enumer.darwin-amd64.tar.gz
+  - cli/build/enumer.darwin-arm64.tar.gz
   - cli/build/enumer.windows-amd64.exe.tar.gz
   - cli/build/sha256sum.txt
   on:
-    go: 1.13.x
+    go: 1.17.x
     repo: dmarkham/enumer
     tags: true

Makefile

@@ -7,6 +7,7 @@ build-cli: clean
 	-mkdir -p ./cli/build
 	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o ./cli/build/enumer.linux-amd64  .
 	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -a -o ./cli/build/enumer.darwin-amd64 .
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -a -o ./cli/build/enumer.darwin-arm64 .
 	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -o ./cli/build/enumer.windows-amd64.exe .
 	cd ./cli/build && find . -name 'enumer*' | xargs -I{} tar czf {}.tar.gz {}
 	cd ./cli/build && shasum -a 256 * > sha256sum.txt

README.md

@@ -1,10 +1,10 @@
-# Enumer [![GoDoc](https://godoc.org/github.com/dmarkham/enumer?status.svg)](https://godoc.org/github.com/dmarkham/enumer) [![Go Report Card](https://goreportcard.com/badge/github.com/dmarkham/enumer)](https://goreportcard.com/report/github.com/dmarkham/enumer) [![GitHub Release](https://img.shields.io/github/release/dmarkham/enumer.svg)](https://github.com/dmarkham/enumer/releases)[![Build Status](https://travis-ci.org/dmarkham/enumer.svg?branch=master)](https://travis-ci.org/dmarkham/enumer)
+# Enumer [![GoDoc](https://godoc.org/git.internal/re/enumer?status.svg)](https://godoc.org/git.internal/re/enumer) [![Go Report Card](https://goreportcard.com/badge/git.internal/re/enumer)](https://goreportcard.com/report/git.internal/re/enumer) [![GitHub Release](https://img.shields.io/github/release/dmarkham/enumer.svg)](https://git.internal/re/enumer/releases)[![Build Status](https://travis-ci.com/dmarkham/enumer.svg?branch=master)](https://travis-ci.com/dmarkham/enumer)
 
 
 Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
 It started as a fork of [Rob Pike’s Stringer tool](https://godoc.org/golang.org/x/tools/cmd/stringer)
 maintained by [Álvaro López Espinosa](https://github.com/alvaroloes/enumer). 
-This was again forked here as (https://github.com/dmarkham/enumer) picking up where Álvaro left off.
+This was again forked here as (https://git.internal/re/enumer) picking up where Álvaro left off.
 
 
 ```
@@ -14,12 +14,14 @@ Usage of ./enumer:
         Enumer [flags] -type T [directory]
         Enumer [flags] -type T files... # Must be a single package
 For more information, see:
-        http://godoc.org/github.com/dmarkham/enumer
+        http://godoc.org/git.internal/re/enumer
 Flags:
   -addprefix string
         transform each item name by adding a prefix. Default: ""
   -comment value
         comments to include in generated code, can repeat. Default: ""
+  -gqlgen
+        if true, GraphQL marshaling methods for gqlgen will be generated. Default: false
   -json
         if true, json marshaling methods will be generated. Default: false
   -linecomment
@@ -36,6 +38,8 @@ Flags:
         transform each item name by removing a prefix. Default: ""
   -type string
         comma-separated list of type names; must be set
+  -values
+    	if true, alternative string values method will be generated. Default: false
   -yaml
         if true, yaml marshaling methods will be generated. Default: false
 ```
@@ -191,6 +195,12 @@ name := MyTypeValue.String() // name => "my_type_value"
 
 ## How to use
 
+For a module-aware repo with `enumer` in the `go.mod` file, generation can be called by adding the following to a `.go` source file:
+
+```golang
+//go:generate go run git.internal/re/enumer -type=YOURTYPE
+```
+
 There are four boolean flags: `json`, `text`, `yaml` and `sql`. You can use any combination of them (i.e. `enumer -type=Pill -json -text`),
 
 For enum string representation transformation the `transform` and `trimprefix` flags
@@ -203,6 +213,8 @@ it is transformed). If a name doesn't have the prefix it will be passed unchange
 
 If a prefix is provided via the `addprefix` flag, it will be added to the start of each name (after trimming and after transforming).
 
+The boolean flag `values` will additionally create an alternative string values method `Values() []string` to fullfill the `EnumValues` interface of [ent](https://entgo.io/docs/schema-fields/#enum-fields).
+
 ## Inspiring projects
 
 - [Álvaro López Espinosa](https://github.com/alvaroloes/enumer)

endtoend_test.go

@@ -65,7 +65,6 @@ func TestEndToEnd(t *testing.T) {
 	// Generate, compile, and run the test programs.
 	for _, name := range names {
 		if !strings.HasSuffix(name, ".go") {
-			t.Errorf("%s is not a Go file", name)
 			continue
 		}
 		if name == "cgo.go" && !build.Default.CgoEnabled {
@@ -172,4 +171,4 @@ func runInDir(dir, name string, arg ...string) error {
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	return cmd.Run()
-}
+}

enumer.go

@@ -10,6 +10,10 @@ func %[1]sString(s string) (%[1]s, error) {
 	if val, ok := _%[1]sNameToValueMap[s]; ok {
 		return val, nil
 	}
+
+	if val, ok := _%[1]sNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
 	return 0, fmt.Errorf("%%s does not belong to %[1]s values", s)
 }
 `
@@ -54,6 +58,18 @@ func (i %[1]s) IsA%[1]s() bool {
 }
 `
 
+// Arguments to format are:
+//	[1]: type name
+const altStringValuesMethod = `func (%[1]s) Values() []string {
+	return %[1]sStrings()
+}
+`
+
+func (g *Generator) buildAltStringValuesMethod(typeName string) {
+	g.Printf("\n")
+	g.Printf(altStringValuesMethod, typeName)
+}
+
 func (g *Generator) buildBasicExtras(runs [][]Value, typeName string, runsThreshold int) {
 	// At this moment, either "g.declareIndexAndNameVars()" or "g.declareNameVars()" has been called
 
@@ -61,7 +77,7 @@ func (g *Generator) buildBasicExtras(runs [][]Value, typeName string, runsThresh
 	g.Printf("\nvar _%sValues = []%s{", typeName, typeName)
 	for _, values := range runs {
 		for _, value := range values {
-			g.Printf("\t%s, ", value.str)
+			g.Printf("\t%s, ", value.originalName)
 		}
 	}
 	g.Printf("}\n\n")
@@ -98,8 +114,8 @@ func (g *Generator) printValueMap(runs [][]Value, typeName string, runsThreshold
 		}
 
 		for _, value := range values {
-			g.Printf("\t_%sName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), &value)
+			g.Printf("\t_%sName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), value.originalName)
-			g.Printf("\t_%sLowerName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), &value)
+			g.Printf("\t_%sLowerName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), value.originalName)
 			n += len(value.name)
 		}
 	}

examples/gomods/README.md

@@ -2,7 +2,7 @@
 
 ## Steps
 
- 1. Go get enumer `go get -u  github.com/dmarkham/enumer`
+ 1. Go get enumer `go get -u  git.internal/re/enumer`
  2. `go generate` This should create `pill_enumer.go`
  3. `go run  *.go` to see it in action
  4. `go mod tidy` to remove the deps for `enumer` once your happy.

examples/gomods/main.go

@@ -2,7 +2,7 @@ package main
 
 import "fmt"
 
-//go:generate go run github.com/dmarkham/enumer -type=Pill -json
+//go:generate go run git.internal/re/enumer -type=Pill -json
 type Pill int
 
 const (

go.mod

@@ -1,8 +1,13 @@
-module github.com/dmarkham/enumer
+module git.internal/re/enumer
 
 require (
 	github.com/pascaldekloe/name v1.0.0
-	golang.org/x/tools v0.0.0-20200221224223-e1da425f72fd
+	golang.org/x/tools v0.1.12
 )
 
-go 1.13
+require (
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+)
+
+go 1.17

go.sum

@@ -1,16 +1,28 @@
 github.com/pascaldekloe/name v1.0.0 h1:n7LKFgHixETzxpRv2R77YgPUFo85QHGZKrdaYm7eY5U=
 github.com/pascaldekloe/name v1.0.0/go.mod h1:Z//MfYJnH4jVpQ9wkclwu2I2MkHmXTlT9wR5UZScttM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee h1:WG0RUwxtNT4qqaXX3DPA8zHFNm/D9xaBpxzHt1WcA/E=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
-golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20200221224223-e1da425f72fd h1:hHkvGJK23seRCflePJnVa9IMv8fsuavSCWKd11kDQFs=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20200221224223-e1da425f72fd/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

gqlgen.go

@@ -0,0 +1,26 @@
+package main
+
+// Arguments to format are:
+//	[1]: type name
+const gqlgenMethods = `
+// MarshalGQL implements the graphql.Marshaler interface for %[1]s
+func (i %[1]s) MarshalGQL(w io.Writer) {
+	fmt.Fprint(w, strconv.Quote(i.String()))
+}
+
+// UnmarshalGQL implements the graphql.Unmarshaler interface for %[1]s
+func (i *%[1]s) UnmarshalGQL(value interface{}) error {
+	str, ok := value.(string)
+	if !ok {
+		return fmt.Errorf("%[1]s should be a string, got %%T", value)
+	}
+
+	var err error
+	*i, err = %[1]sString(str)
+	return err
+}
+`
+
+func (g *Generator) buildGQLGenMethods(runs [][]Value, typeName string) {
+	g.Printf(gqlgenMethods, typeName)
+}

sql.go

@@ -12,21 +12,23 @@ const scanMethod = `func (i *%[1]s) Scan(value interface{}) error {
 		return nil
 	}
 
-	str, ok := value.(string)
+	var str string
-	if !ok {
+	switch v := value.(type) {
-		bytes, ok := value.([]byte)
+	case []byte:
-		if !ok {
+		str = string(v)
-			return fmt.Errorf("value is not a byte slice")
+	case string:
-		}
+		str = v
-
+	case fmt.Stringer:
-		str = string(bytes[:])
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of %[1]s: %%[1]T(%%[1]v)", value)
 	}
 
 	val, err := %[1]sString(str)
 	if err != nil {
 		return err
 	}
-	
+
 	*i = val
 	return nil
 }

stringer.go

@@ -5,7 +5,7 @@
 // Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
 // It started as a fork of Rob Pike’s Stringer tool
 //
-// Please visit http://github.com/dmarkham/enumer for a comprehensive documentation
+// Please visit http://git.internal/re/enumer for a comprehensive documentation
 package main
 
 import (
@@ -49,6 +49,8 @@ var (
 	json            = flag.Bool("json", false, "if true, json marshaling methods will be generated. Default: false")
 	yaml            = flag.Bool("yaml", false, "if true, yaml marshaling methods will be generated. Default: false")
 	text            = flag.Bool("text", false, "if true, text marshaling methods will be generated. Default: false")
+	gqlgen          = flag.Bool("gqlgen", false, "if true, GraphQL marshaling methods for gqlgen will be generated. Default: false")
+	altValuesFunc   = flag.Bool("values", false, "if true, alternative string values method will be generated. Default: false")
 	output          = flag.String("output", "", "output file name; default srcdir/<type>_string.go")
 	transformMethod = flag.String("transform", "noop", "enum item name transformation method. Default: noop")
 	trimPrefix      = flag.String("trimprefix", "", "transform each item name by removing a prefix. Default: \"\"")
@@ -69,7 +71,7 @@ func Usage() {
 	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T [directory]\n")
 	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T files... # Must be a single package\n")
 	_, _ = fmt.Fprintf(os.Stderr, "For more information, see:\n")
-	_, _ = fmt.Fprintf(os.Stderr, "\thttp://godoc.org/github.com/dmarkham/enumer\n")
+	_, _ = fmt.Fprintf(os.Stderr, "\thttp://godoc.org/git.internal/re/enumer\n")
 	_, _ = fmt.Fprintf(os.Stderr, "Flags:\n")
 	flag.PrintDefaults()
 }
@@ -118,17 +120,22 @@ func main() {
 	g.Printf("\n")
 	g.Printf("import (\n")
 	g.Printf("\t\"fmt\"\n")
+	g.Printf("\t\"strings\"\n")
 	if *sql {
 		g.Printf("\t\"database/sql/driver\"\n")
 	}
 	if *json {
 		g.Printf("\t\"encoding/json\"\n")
 	}
+	if *gqlgen {
+		g.Printf("\t\"io\"\n")
+		g.Printf("\t\"strconv\"\n")
+	}
 	g.Printf(")\n")
 
 	// Run generate for each type.
 	for _, typeName := range typs {
-		g.generate(typeName, *json, *yaml, *sql, *text, *transformMethod, *trimPrefix, *addPrefix, *linecomment)
+		g.generate(typeName, *json, *yaml, *sql, *text, *gqlgen, *transformMethod, *trimPrefix, *addPrefix, *linecomment, *altValuesFunc)
 	}
 
 	// Format the output.
@@ -377,8 +384,17 @@ func (g *Generator) transformValueNames(values []Value, transformMethod string)
 		return
 	}
 
-	for i := range values {
+	for i, v := range values {
-		values[i].name = fn(values[i].name)
+		after := fn(v.name)
+		// If the original one was "" or the one before the transformation
+		// was "" (most commonly if linecomment defines it as empty) we
+		// do not care if it's empty.
+		// But if any of them was not empty before then it means that
+		// the transformed emptied the value
+		if v.originalName != "" && v.name != "" && after == "" {
+			log.Fatalf("transformation of %q (%s) got an empty result", v.name, v.originalName)
+		}
+		values[i].name = after
 	}
 }
 
@@ -397,8 +413,9 @@ func (g *Generator) prefixValueNames(values []Value, prefix string) {
 }
 
 // generate produces the String method for the named type.
-func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeSQL, includeText bool,
+func (g *Generator) generate(typeName string,
-	transformMethod string, trimPrefix string, addPrefix string, lineComment bool) {
+	includeJSON, includeYAML, includeSQL, includeText, includeGQLGen bool,
+	transformMethod string, trimPrefix string, addPrefix string, lineComment bool, includeValuesMethod bool) {
 	values := make([]Value, 0, 100)
 	for _, file := range g.pkg.files {
 		file.lineComment = lineComment
@@ -445,6 +462,11 @@ func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeS
 	default:
 		g.buildMap(runs, typeName)
 	}
+	if includeValuesMethod {
+		g.buildAltStringValuesMethod(typeName)
+	}
+
+	g.buildNoOpOrderChangeDetect(runs, typeName)
 
 	g.buildBasicExtras(runs, typeName, runsThreshold)
 	if includeJSON {
@@ -459,6 +481,9 @@ func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeS
 	if includeSQL {
 		g.addValueAndScanMethod(typeName)
 	}
+	if includeGQLGen {
+		g.buildGQLGenMethods(runs, typeName)
+	}
 }
 
 // splitIntoRuns breaks the values into runs of contiguous sequences.
@@ -508,7 +533,8 @@ func (g *Generator) format() []byte {
 
 // Value represents a declared constant.
 type Value struct {
-	name string // The name of the constant after transformation (i.e. camel case => snake case)
+	originalName string // The name of the constant before transformation
+	name         string // The name of the constant after transformation (i.e. camel case => snake case)
 	// The value is stored as a bit pattern alone. The boolean tells us
 	// whether to interpret it as an int64 or a uint64; the only place
 	// this matters is when sorting.
@@ -602,10 +628,11 @@ func (f *File) genDecl(node ast.Node) bool {
 				u64 = uint64(i64)
 			}
 			v := Value{
-				name:   n.Name,
+				originalName: n.Name,
-				value:  u64,
+				name:         n.Name,
-				signed: info&types.IsUnsigned == 0,
+				value:        u64,
-				str:    value.String(),
+				signed:       info&types.IsUnsigned == 0,
+				str:          value.String(),
 			}
 			if c := vspec.Comment; f.lineComment && c != nil && len(c.List) == 1 {
 				v.name = strings.TrimSpace(c.Text())
@@ -763,8 +790,6 @@ const stringOneRun = `func (i %[1]s) String() string {
 // 	[2]: lowest defined value for type, as a string
 // 	[3]: size of index element (8 for uint8 etc.)
 // 	[4]: less than zero check (for signed types)
-/*
- */
 const stringOneRunWithOffset = `func (i %[1]s) String() string {
 	i -= %[2]s
 	if %[4]si >= %[1]s(len(_%[1]sIndex)-1) {
@@ -817,6 +842,24 @@ func (g *Generator) buildMap(runs [][]Value, typeName string) {
 	g.Printf(stringMap, typeName)
 }
 
+// buildNoOpOrderChangeDetect try to let the compiler and the user know if the order/value of the ENUMS have changed.
+func (g *Generator) buildNoOpOrderChangeDetect(runs [][]Value, typeName string) {
+	g.Printf("\n")
+
+	g.Printf(`
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	`)
+	g.Printf("func _%sNoOp (){ ", typeName)
+	g.Printf("\n var x [1]struct{}\n")
+	for _, values := range runs {
+		for _, value := range values {
+			g.Printf("\t_ = x[%s-(%s)]\n", value.originalName, value.str)
+		}
+	}
+	g.Printf("}\n\n")
+}
+
 // Argument to format is the type name.
 const stringMap = `func (i %[1]s) String() string {
 	if str, ok := _%[1]sMap[i]; ok {

testdata/day.golden

@@ -0,0 +1,94 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+func (Day) Values() []string {
+	return DayStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        Monday,
+	_DayLowerName[0:6]:   Monday,
+	_DayName[6:13]:       Tuesday,
+	_DayLowerName[6:13]:  Tuesday,
+	_DayName[13:22]:      Wednesday,
+	_DayLowerName[13:22]: Wednesday,
+	_DayName[22:30]:      Thursday,
+	_DayLowerName[22:30]: Thursday,
+	_DayName[30:36]:      Friday,
+	_DayLowerName[30:36]: Friday,
+	_DayName[36:44]:      Saturday,
+	_DayLowerName[36:44]: Saturday,
+	_DayName[44:50]:      Sunday,
+	_DayLowerName[44:50]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayTrimAndPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "NightMondayNightTuesdayNightWednesdayNightThursdayNightFridayNightSaturdayNightSunday"
+
+var _DayIndex = [...]uint8{0, 11, 23, 37, 50, 61, 74, 85}
+
+const _DayLowerName = "nightmondaynighttuesdaynightwednesdaynightthursdaynightfridaynightsaturdaynightsunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[DayTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[DayThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[DaySaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, DayTuesday, DayWednesday, DayThursday, DayFriday, DaySaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:11]:       DayMonday,
+	_DayLowerName[0:11]:  DayMonday,
+	_DayName[11:23]:      DayTuesday,
+	_DayLowerName[11:23]: DayTuesday,
+	_DayName[23:37]:      DayWednesday,
+	_DayLowerName[23:37]: DayWednesday,
+	_DayName[37:50]:      DayThursday,
+	_DayLowerName[37:50]: DayThursday,
+	_DayName[50:61]:      DayFriday,
+	_DayLowerName[50:61]: DayFriday,
+	_DayName[61:74]:      DaySaturday,
+	_DayLowerName[61:74]: DaySaturday,
+	_DayName[74:85]:      DaySunday,
+	_DayLowerName[74:85]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:11],
+	_DayName[11:23],
+	_DayName[23:37],
+	_DayName[37:50],
+	_DayName[50:61],
+	_DayName[61:74],
+	_DayName[74:85],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayWithLinecomment.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "lunesTuesdayWednesdayThursdayviernesSaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 5, 12, 21, 29, 36, 44, 50}
+
+const _DayLowerName = "lunestuesdaywednesdaythursdayviernessaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:5]:        Monday,
+	_DayLowerName[0:5]:   Monday,
+	_DayName[5:12]:       Tuesday,
+	_DayLowerName[5:12]:  Tuesday,
+	_DayName[12:21]:      Wednesday,
+	_DayLowerName[12:21]: Wednesday,
+	_DayName[21:29]:      Thursday,
+	_DayLowerName[21:29]: Thursday,
+	_DayName[29:36]:      Friday,
+	_DayLowerName[29:36]: Friday,
+	_DayName[36:44]:      Saturday,
+	_DayLowerName[36:44]: Saturday,
+	_DayName[44:50]:      Sunday,
+	_DayLowerName[44:50]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:5],
+	_DayName[5:12],
+	_DayName[12:21],
+	_DayName[21:29],
+	_DayName[29:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayWithPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "DayMondayDayTuesdayDayWednesdayDayThursdayDayFridayDaySaturdayDaySunday"
+
+var _DayIndex = [...]uint8{0, 9, 19, 31, 42, 51, 62, 71}
+
+const _DayLowerName = "daymondaydaytuesdaydaywednesdaydaythursdaydayfridaydaysaturdaydaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:9]:        Monday,
+	_DayLowerName[0:9]:   Monday,
+	_DayName[9:19]:       Tuesday,
+	_DayLowerName[9:19]:  Tuesday,
+	_DayName[19:31]:      Wednesday,
+	_DayLowerName[19:31]: Wednesday,
+	_DayName[31:42]:      Thursday,
+	_DayLowerName[31:42]: Thursday,
+	_DayName[42:51]:      Friday,
+	_DayLowerName[42:51]: Friday,
+	_DayName[51:62]:      Saturday,
+	_DayLowerName[51:62]: Saturday,
+	_DayName[62:71]:      Sunday,
+	_DayLowerName[62:71]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:9],
+	_DayName[9:19],
+	_DayName[19:31],
+	_DayName[31:42],
+	_DayName[42:51],
+	_DayName[51:62],
+	_DayName[62:71],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/gap.golden

@@ -0,0 +1,115 @@
+
+const (
+	_GapName_0      = "TwoThree"
+	_GapLowerName_0 = "twothree"
+	_GapName_1      = "FiveSixSevenEightNine"
+	_GapLowerName_1 = "fivesixseveneightnine"
+	_GapName_2      = "Eleven"
+	_GapLowerName_2 = "eleven"
+)
+
+var (
+	_GapIndex_0 = [...]uint8{0, 3, 8}
+	_GapIndex_1 = [...]uint8{0, 4, 7, 12, 17, 21}
+	_GapIndex_2 = [...]uint8{0, 6}
+)
+
+func (i Gap) String() string {
+	switch {
+	case 2 <= i && i <= 3:
+		i -= 2
+		return _GapName_0[_GapIndex_0[i]:_GapIndex_0[i+1]]
+	case 5 <= i && i <= 9:
+		i -= 5
+		return _GapName_1[_GapIndex_1[i]:_GapIndex_1[i+1]]
+	case i == 11:
+		return _GapName_2
+	default:
+		return fmt.Sprintf("Gap(%d)", i)
+	}
+}
+
+func (Gap) Values() []string {
+	return GapStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _GapNoOp() {
+	var x [1]struct{}
+	_ = x[Two-(2)]
+	_ = x[Three-(3)]
+	_ = x[Five-(5)]
+	_ = x[Six-(6)]
+	_ = x[Seven-(7)]
+	_ = x[Eight-(8)]
+	_ = x[Nine-(9)]
+	_ = x[Eleven-(11)]
+}
+
+var _GapValues = []Gap{Two, Three, Five, Six, Seven, Eight, Nine, Eleven}
+
+var _GapNameToValueMap = map[string]Gap{
+	_GapName_0[0:3]:        Two,
+	_GapLowerName_0[0:3]:   Two,
+	_GapName_0[3:8]:        Three,
+	_GapLowerName_0[3:8]:   Three,
+	_GapName_1[0:4]:        Five,
+	_GapLowerName_1[0:4]:   Five,
+	_GapName_1[4:7]:        Six,
+	_GapLowerName_1[4:7]:   Six,
+	_GapName_1[7:12]:       Seven,
+	_GapLowerName_1[7:12]:  Seven,
+	_GapName_1[12:17]:      Eight,
+	_GapLowerName_1[12:17]: Eight,
+	_GapName_1[17:21]:      Nine,
+	_GapLowerName_1[17:21]: Nine,
+	_GapName_2[0:6]:        Eleven,
+	_GapLowerName_2[0:6]:   Eleven,
+}
+
+var _GapNames = []string{
+	_GapName_0[0:3],
+	_GapName_0[3:8],
+	_GapName_1[0:4],
+	_GapName_1[4:7],
+	_GapName_1[7:12],
+	_GapName_1[12:17],
+	_GapName_1[17:21],
+	_GapName_2[0:6],
+}
+
+// GapString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func GapString(s string) (Gap, error) {
+	if val, ok := _GapNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _GapNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Gap values", s)
+}
+
+// GapValues returns all values of the enum
+func GapValues() []Gap {
+	return _GapValues
+}
+
+// GapStrings returns a slice of all String values of the enum
+func GapStrings() []string {
+	strs := make([]string, len(_GapNames))
+	copy(strs, _GapNames)
+	return strs
+}
+
+// IsAGap returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Gap) IsAGap() bool {
+	for _, v := range _GapValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/num.golden

@@ -0,0 +1,87 @@
+
+const _NumName = "m_2m_1m0m1m2"
+
+var _NumIndex = [...]uint8{0, 3, 6, 8, 10, 12}
+
+const _NumLowerName = "m_2m_1m0m1m2"
+
+func (i Num) String() string {
+	i -= -2
+	if i < 0 || i >= Num(len(_NumIndex)-1) {
+		return fmt.Sprintf("Num(%d)", i+-2)
+	}
+	return _NumName[_NumIndex[i]:_NumIndex[i+1]]
+}
+
+func (Num) Values() []string {
+	return NumStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _NumNoOp() {
+	var x [1]struct{}
+	_ = x[m_2-(-2)]
+	_ = x[m_1-(-1)]
+	_ = x[m0-(0)]
+	_ = x[m1-(1)]
+	_ = x[m2-(2)]
+}
+
+var _NumValues = []Num{m_2, m_1, m0, m1, m2}
+
+var _NumNameToValueMap = map[string]Num{
+	_NumName[0:3]:        m_2,
+	_NumLowerName[0:3]:   m_2,
+	_NumName[3:6]:        m_1,
+	_NumLowerName[3:6]:   m_1,
+	_NumName[6:8]:        m0,
+	_NumLowerName[6:8]:   m0,
+	_NumName[8:10]:       m1,
+	_NumLowerName[8:10]:  m1,
+	_NumName[10:12]:      m2,
+	_NumLowerName[10:12]: m2,
+}
+
+var _NumNames = []string{
+	_NumName[0:3],
+	_NumName[3:6],
+	_NumName[6:8],
+	_NumName[8:10],
+	_NumName[10:12],
+}
+
+// NumString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func NumString(s string) (Num, error) {
+	if val, ok := _NumNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _NumNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Num values", s)
+}
+
+// NumValues returns all values of the enum
+func NumValues() []Num {
+	return _NumValues
+}
+
+// NumStrings returns a slice of all String values of the enum
+func NumStrings() []string {
+	strs := make([]string, len(_NumNames))
+	copy(strs, _NumNames)
+	return strs
+}
+
+// IsANum returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Num) IsANum() bool {
+	for _, v := range _NumValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/offset.golden

@@ -0,0 +1,79 @@
+
+const _NumberName = "OneTwoThree"
+
+var _NumberIndex = [...]uint8{0, 3, 6, 11}
+
+const _NumberLowerName = "onetwothree"
+
+func (i Number) String() string {
+	i -= 1
+	if i < 0 || i >= Number(len(_NumberIndex)-1) {
+		return fmt.Sprintf("Number(%d)", i+1)
+	}
+	return _NumberName[_NumberIndex[i]:_NumberIndex[i+1]]
+}
+
+func (Number) Values() []string {
+	return NumberStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _NumberNoOp() {
+	var x [1]struct{}
+	_ = x[One-(1)]
+	_ = x[Two-(2)]
+	_ = x[Three-(3)]
+}
+
+var _NumberValues = []Number{One, Two, Three}
+
+var _NumberNameToValueMap = map[string]Number{
+	_NumberName[0:3]:       One,
+	_NumberLowerName[0:3]:  One,
+	_NumberName[3:6]:       Two,
+	_NumberLowerName[3:6]:  Two,
+	_NumberName[6:11]:      Three,
+	_NumberLowerName[6:11]: Three,
+}
+
+var _NumberNames = []string{
+	_NumberName[0:3],
+	_NumberName[3:6],
+	_NumberName[6:11],
+}
+
+// NumberString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func NumberString(s string) (Number, error) {
+	if val, ok := _NumberNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _NumberNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Number values", s)
+}
+
+// NumberValues returns all values of the enum
+func NumberValues() []Number {
+	return _NumberValues
+}
+
+// NumberStrings returns a slice of all String values of the enum
+func NumberStrings() []string {
+	strs := make([]string, len(_NumberNames))
+	copy(strs, _NumberNames)
+	return strs
+}
+
+// IsANumber returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Number) IsANumber() bool {
+	for _, v := range _NumberValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/prime.golden

@@ -0,0 +1,127 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+func (Prime) Values() []string {
+	return PrimeStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}

testdata/primeGQLGen.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalGQL implements the graphql.Marshaler interface for Prime
+func (i Prime) MarshalGQL(w io.Writer) {
+	fmt.Fprint(w, strconv.Quote(i.String()))
+}
+
+// UnmarshalGQL implements the graphql.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalGQL(value interface{}) error {
+	str, ok := value.(string)
+	if !ok {
+		return fmt.Errorf("Prime should be a string, got %T", value)
+	}
+
+	var err error
+	*i, err = PrimeString(str)
+	return err
+}

testdata/primeJson.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalJSON implements the json.Marshaler interface for Prime
+func (i Prime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return fmt.Errorf("Prime should be a string, got %s", data)
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}

testdata/primeJsonAndSql.golden

@@ -0,0 +1,170 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalJSON implements the json.Marshaler interface for Prime
+func (i Prime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return fmt.Errorf("Prime should be a string, got %s", data)
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}
+
+func (i Prime) Value() (driver.Value, error) {
+	return i.String(), nil
+}
+
+func (i *Prime) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	var str string
+	switch v := value.(type) {
+	case []byte:
+		str = string(v)
+	case string:
+		str = v
+	case fmt.Stringer:
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of Prime: %[1]T(%[1]v)", value)
+	}
+
+	val, err := PrimeString(str)
+	if err != nil {
+		return err
+	}
+
+	*i = val
+	return nil
+}

testdata/primeSql.golden

@@ -0,0 +1,153 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+func (i Prime) Value() (driver.Value, error) {
+	return i.String(), nil
+}
+
+func (i *Prime) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	var str string
+	switch v := value.(type) {
+	case []byte:
+		str = string(v)
+	case string:
+		str = v
+	case fmt.Stringer:
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of Prime: %[1]T(%[1]v)", value)
+	}
+
+	val, err := PrimeString(str)
+	if err != nil {
+		return err
+	}
+
+	*i = val
+	return nil
+}

testdata/primeText.golden

@@ -0,0 +1,135 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalText implements the encoding.TextMarshaler interface for Prime
+func (i Prime) MarshalText() ([]byte, error) {
+	return []byte(i.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface for Prime
+func (i *Prime) UnmarshalText(text []byte) error {
+	var err error
+	*i, err = PrimeString(string(text))
+	return err
+}

testdata/primeYaml.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalYAML implements a YAML Marshaler for Prime
+func (i Prime) MarshalYAML() (interface{}, error) {
+	return i.String(), nil
+}
+
+// UnmarshalYAML implements a YAML Unmarshaler for Prime
+func (i *Prime) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}

testdata/trimPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[DayTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[DayThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[DaySaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, DayTuesday, DayWednesday, DayThursday, DayFriday, DaySaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        DayMonday,
+	_DayLowerName[0:6]:   DayMonday,
+	_DayName[6:13]:       DayTuesday,
+	_DayLowerName[6:13]:  DayTuesday,
+	_DayName[13:22]:      DayWednesday,
+	_DayLowerName[13:22]: DayWednesday,
+	_DayName[22:30]:      DayThursday,
+	_DayLowerName[22:30]: DayThursday,
+	_DayName[30:36]:      DayFriday,
+	_DayLowerName[30:36]: DayFriday,
+	_DayName[36:44]:      DaySaturday,
+	_DayLowerName[36:44]: DaySaturday,
+	_DayName[44:50]:      DaySunday,
+	_DayLowerName[44:50]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/trimPrefixMultiple.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[NightTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[NightThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[NightSaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, NightTuesday, DayWednesday, NightThursday, DayFriday, NightSaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        DayMonday,
+	_DayLowerName[0:6]:   DayMonday,
+	_DayName[6:13]:       NightTuesday,
+	_DayLowerName[6:13]:  NightTuesday,
+	_DayName[13:22]:      DayWednesday,
+	_DayLowerName[13:22]: DayWednesday,
+	_DayName[22:30]:      NightThursday,
+	_DayLowerName[22:30]: NightThursday,
+	_DayName[30:36]:      DayFriday,
+	_DayLowerName[30:36]: DayFriday,
+	_DayName[36:44]:      NightSaturday,
+	_DayLowerName[36:44]: NightSaturday,
+	_DayName[44:50]:      DaySunday,
+	_DayLowerName[44:50]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/unum.golden

@@ -0,0 +1,97 @@
+
+const (
+	_UnumName_0      = "m0m1m2"
+	_UnumLowerName_0 = "m0m1m2"
+	_UnumName_1      = "m_2m_1"
+	_UnumLowerName_1 = "m_2m_1"
+)
+
+var (
+	_UnumIndex_0 = [...]uint8{0, 2, 4, 6}
+	_UnumIndex_1 = [...]uint8{0, 3, 6}
+)
+
+func (i Unum) String() string {
+	switch {
+	case 0 <= i && i <= 2:
+		return _UnumName_0[_UnumIndex_0[i]:_UnumIndex_0[i+1]]
+	case 253 <= i && i <= 254:
+		i -= 253
+		return _UnumName_1[_UnumIndex_1[i]:_UnumIndex_1[i+1]]
+	default:
+		return fmt.Sprintf("Unum(%d)", i)
+	}
+}
+
+func (Unum) Values() []string {
+	return UnumStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _UnumNoOp() {
+	var x [1]struct{}
+	_ = x[m0-(0)]
+	_ = x[m1-(1)]
+	_ = x[m2-(2)]
+	_ = x[m_2-(253)]
+	_ = x[m_1-(254)]
+}
+
+var _UnumValues = []Unum{m0, m1, m2, m_2, m_1}
+
+var _UnumNameToValueMap = map[string]Unum{
+	_UnumName_0[0:2]:      m0,
+	_UnumLowerName_0[0:2]: m0,
+	_UnumName_0[2:4]:      m1,
+	_UnumLowerName_0[2:4]: m1,
+	_UnumName_0[4:6]:      m2,
+	_UnumLowerName_0[4:6]: m2,
+	_UnumName_1[0:3]:      m_2,
+	_UnumLowerName_1[0:3]: m_2,
+	_UnumName_1[3:6]:      m_1,
+	_UnumLowerName_1[3:6]: m_1,
+}
+
+var _UnumNames = []string{
+	_UnumName_0[0:2],
+	_UnumName_0[2:4],
+	_UnumName_0[4:6],
+	_UnumName_1[0:3],
+	_UnumName_1[3:6],
+}
+
+// UnumString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func UnumString(s string) (Unum, error) {
+	if val, ok := _UnumNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _UnumNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Unum values", s)
+}
+
+// UnumValues returns all values of the enum
+func UnumValues() []Unum {
+	return _UnumValues
+}
+
+// UnumStrings returns a slice of all String values of the enum
+func UnumStrings() []string {
+	strs := make([]string, len(_UnumNames))
+	copy(strs, _UnumNames)
+	return strs
+}
+
+// IsAUnum returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Unum) IsAUnum() bool {
+	for _, v := range _UnumValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

util_test.go

@@ -54,7 +54,7 @@ Outer:
 	for n, test := range splitTests {
 		values := make([]Value, len(test.input))
 		for i, v := range test.input {
-			values[i] = Value{"", v, test.signed, fmt.Sprint(v)}
+			values[i] = Value{"", "", v, test.signed, fmt.Sprint(v)}
 		}
 		runs := splitIntoRuns(values)
 		if len(runs) != len(test.output) {