292 lines
8.2 KiB
Go
292 lines
8.2 KiB
Go
package generator
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import (
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"strings"
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"unicode"
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"unicode/utf8"
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"github.com/jhump/protoreflect/desc"
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"google.golang.org/protobuf/proto"
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descriptor "google.golang.org/protobuf/types/descriptorpb"
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"google.golang.org/protobuf/types/pluginpb"
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gqlpb "go.unistack.org/micro-proto/v3/graphql"
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)
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func GraphqlMethodOptions(opts proto.Message) *gqlpb.Rpc {
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if opts != nil {
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v := proto.GetExtension(opts, gqlpb.E_Rpc)
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if v != nil {
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return v.(*gqlpb.Rpc)
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}
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}
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return nil
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}
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func GraphqlServiceOptions(opts proto.Message) *gqlpb.Svc {
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if opts != nil {
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v := proto.GetExtension(opts, gqlpb.E_Svc)
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if v != nil {
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return v.(*gqlpb.Svc)
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}
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}
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return nil
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}
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func GraphqlFieldOptions(opts proto.Message) *gqlpb.Field {
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if opts != nil {
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v := proto.GetExtension(opts, gqlpb.E_Field)
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if v != nil && v.(*gqlpb.Field) != nil {
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return v.(*gqlpb.Field)
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}
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}
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return nil
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}
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func GraphqlOneofOptions(opts proto.Message) *gqlpb.Oneof {
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if opts != nil {
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v := proto.GetExtension(opts, gqlpb.E_Oneof)
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if v != nil && v.(*gqlpb.Oneof) != nil {
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return v.(*gqlpb.Oneof)
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}
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}
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return nil
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}
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// GoCamelCase camel-cases a protobuf name for use as a Go identifier.
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//
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// If there is an interior underscore followed by a lower case letter,
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// drop the underscore and convert the letter to upper case.
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func GoCamelCase(s string) string {
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// Invariant: if the next letter is lower case, it must be converted
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// to upper case.
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// That is, we process a word at a time, where words are marked by _ or
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// upper case letter. Digits are treated as words.
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var b []byte
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for i := 0; i < len(s); i++ {
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c := s[i]
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switch {
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case c == '.' && i+1 < len(s) && isASCIILower(s[i+1]):
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// Skip over '.' in ".{{lowercase}}".
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case c == '.':
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b = append(b, '_') // convert '.' to '_'
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case c == '_' && (i == 0 || s[i-1] == '.'):
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// Convert initial '_' to ensure we start with a capital letter.
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// Do the same for '_' after '.' to match historic behavior.
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b = append(b, 'X') // convert '_' to 'X'
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case c == '_' && i+1 < len(s) && isASCIILower(s[i+1]):
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// Skip over '_' in "_{{lowercase}}".
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case isASCIIDigit(c):
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b = append(b, c)
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default:
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// Assume we have a letter now - if not, it's a bogus identifier.
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// The next word is a sequence of characters that must start upper case.
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if isASCIILower(c) {
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c -= 'a' - 'A' // convert lowercase to uppercase
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}
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b = append(b, c)
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// Accept lower case sequence that follows.
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for ; i+1 < len(s) && isASCIILower(s[i+1]); i++ {
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b = append(b, s[i+1])
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}
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}
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}
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return string(b)
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}
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func GetRequestType(rpcOpts *gqlpb.Rpc, svcOpts *gqlpb.Svc) gqlpb.Type {
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if rpcOpts != nil && rpcOpts.Type != nil {
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return *rpcOpts.Type
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}
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if svcOpts != nil && svcOpts.Type != nil {
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return *svcOpts.Type
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}
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return gqlpb.Type_DEFAULT
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}
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func CreateDescriptorsFromProto(req *pluginpb.CodeGeneratorRequest) (descs []*desc.FileDescriptor, err error) {
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dd, err := desc.CreateFileDescriptorsFromSet(&descriptor.FileDescriptorSet{
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File: req.GetProtoFile(),
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})
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if err != nil {
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return nil, err
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}
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for _, d := range dd {
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for _, filename := range req.FileToGenerate {
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if filename == d.GetName() {
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descs = append(descs, d)
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}
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}
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}
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return
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}
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func ResolveProtoFilesRecursively(descs []*desc.FileDescriptor) (files FileDescriptors) {
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for _, f := range descs {
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files = append(files, ResolveProtoFilesRecursively(f.GetDependencies())...)
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files = append(files, f)
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}
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return files
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}
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type FileDescriptors []*desc.FileDescriptor
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func (ds FileDescriptors) AsFileDescriptorProto() (files []*descriptor.FileDescriptorProto) {
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for _, d := range ds {
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files = append(files, d.AsFileDescriptorProto())
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}
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return
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}
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// Split splits the camelcase word and returns a list of words. It also
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// supports digits. Both lower camel case and upper camel case are supported.
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// For more info please check: http://en.wikipedia.org/wiki/CamelCase
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//
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// Examples
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//
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// "" => [""]
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// "lowercase" => ["lowercase"]
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// "Class" => ["Class"]
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// "MyClass" => ["My", "Class"]
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// "MyC" => ["My", "C"]
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// "HTML" => ["HTML"]
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// "PDFLoader" => ["PDF", "Loader"]
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// "AString" => ["A", "String"]
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// "SimpleXMLParser" => ["Simple", "XML", "Parser"]
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// "vimRPCPlugin" => ["vim", "RPC", "Plugin"]
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// "GL11Version" => ["GL", "11", "Version"]
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// "99Bottles" => ["99", "Bottles"]
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// "May5" => ["May", "5"]
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// "BFG9000" => ["BFG", "9000"]
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// "BöseÜberraschung" => ["Böse", "Überraschung"]
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// "Two spaces" => ["Two", " ", "spaces"]
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// "BadUTF8\xe2\xe2\xa1" => ["BadUTF8\xe2\xe2\xa1"]
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//
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// Splitting rules
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//
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// 1. If string is not valid UTF-8, return it without splitting as
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// single item array.
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// 2. Assign all unicode characters into one of 4 sets: lower case
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// letters, upper case letters, numbers, and all other characters.
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// 3. Iterate through characters of string, introducing splits
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// between adjacent characters that belong to different sets.
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// 4. Iterate through array of split strings, and if a given string
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// is upper case:
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// if subsequent string is lower case:
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// move last character of upper case string to beginning of
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// lower case string
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func SplitCamelCase(src string) (entries []string) {
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// don't split invalid utf8
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if !utf8.ValidString(src) {
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return []string{src}
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}
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entries = []string{}
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var runes [][]rune
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lastClass := 0
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class := 0
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// split into fields based on class of unicode character
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for _, r := range src {
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switch true {
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case unicode.IsLower(r):
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class = 1
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case unicode.IsUpper(r):
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class = 2
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case unicode.IsDigit(r):
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class = 3
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default:
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class = 4
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}
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if class == lastClass {
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runes[len(runes)-1] = append(runes[len(runes)-1], r)
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} else {
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runes = append(runes, []rune{r})
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}
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lastClass = class
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}
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// handle upper case -> lower case sequences, e.g.
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// "PDFL", "oader" -> "PDF", "Loader"
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for i := 0; i < len(runes)-1; i++ {
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if unicode.IsUpper(runes[i][0]) && unicode.IsLower(runes[i+1][0]) {
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runes[i+1] = append([]rune{runes[i][len(runes[i])-1]}, runes[i+1]...)
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runes[i] = runes[i][:len(runes[i])-1]
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}
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}
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// construct []string from results
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for _, s := range runes {
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if len(s) > 0 {
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entries = append(entries, string(s))
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}
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}
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return
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}
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// CamelCase returns the CamelCased name.
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// If there is an interior underscore followed by a lower case letter,
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// drop the underscore and convert the letter to upper case.
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// There is a remote possibility of this rewrite causing a name collision,
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// but it's so remote we're prepared to pretend it's nonexistent - since the
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// C++ generator lowercases names, it's extremely unlikely to have two fields
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// with different capitalizations.
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// In short, _my_field_name_2 becomes XMyFieldName_2.
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func CamelCase(s string) string {
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if s == "" {
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return ""
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}
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t := make([]byte, 0, 32)
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i := 0
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if s[0] == '_' {
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// Need a capital letter; drop the '_'.
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t = append(t, 'X')
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i++
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}
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// Invariant: if the next letter is lower case, it must be converted
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// to upper case.
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// That is, we process a word at a time, where words are marked by _ or
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// upper case letter. Digits are treated as words.
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for ; i < len(s); i++ {
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c := s[i]
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if c == '_' && i+1 < len(s) && isASCIILower(s[i+1]) {
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continue // Skip the underscore in s.
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}
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if isASCIIDigit(c) {
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t = append(t, c)
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continue
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}
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// Assume we have a letter now - if not, it's a bogus identifier.
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// The next word is a sequence of characters that must start upper case.
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if isASCIILower(c) {
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c ^= ' ' // Make it a capital letter.
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}
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t = append(t, c) // Guaranteed not lower case.
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// Accept lower case sequence that follows.
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for i+1 < len(s) && isASCIILower(s[i+1]) {
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i++
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t = append(t, s[i])
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}
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}
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return string(t)
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}
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// CamelCaseSlice is like CamelCase, but the argument is a slice of strings to
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// be joined with "_".
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func CamelCaseSlice(elem []string) string { return CamelCase(strings.Join(elem, "_")) }
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// Is c an ASCII lower-case letter?
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func isASCIILower(c byte) bool {
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return 'a' <= c && c <= 'z'
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}
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// Is c an ASCII digit?
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func isASCIIDigit(c byte) bool {
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return '0' <= c && c <= '9'
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}
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func ToLowerFirst(s string) string {
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if len(s) > 0 {
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return string(unicode.ToLower(rune(s[0]))) + s[1:]
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}
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return ""
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}
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