/
schemaParsing.go
239 lines (206 loc) · 5.61 KB
/
schemaParsing.go
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package schemaParser
import (
"github.com/graphql-go/graphql"
"reflect"
"regexp"
"strings"
)
type GraphQLType struct {
Query *graphql.Object
}
type GraphQLParsingType struct {
name string
typeName string
fields map[string]GraphQLParsingField
}
type GraphqlParingParam struct {
name string
typeP string
}
type GraphQLParsingField struct {
name string
typeName string
params []GraphqlParingParam
}
func Parsing(sdlContent string, queryFucMap map[string]graphql.FieldResolveFn, schemaFucMap map[string]graphql.FieldResolveFn) (*graphql.Object, error) {
namespaces := strings.Split(sdlContent, "}")
var types []GraphQLParsingType
for _, ns := range namespaces {
ns = strings.TrimSpace(ns)
if strings.HasPrefix(ns, "type ") {
parsingType := GraphQLParsingType{}
typep, fields := splitStringPairs(ns, "{")
_, typeName := splitSpaceAndTabPairs(typep)
parsingType.name = typeName
parsingType.typeName = "type"
fs := splitNewLineAndTabPairs(fields)
for _, fline := range fs {
fieldName, fieldType := splitLastSpacePairs(fline)
fieldName = strings.TrimSpace(fieldName)
fieldType = strings.TrimSpace(fieldType)
f := parsingField(fieldName, fieldType)
if parsingType.fields == nil {
parsingType.fields = make(map[string]GraphQLParsingField)
}
parsingType.fields[f.name] = f
}
types = append(types, parsingType)
}
}
graphqlObjMap := make(map[string]*graphql.Object)
for _, t := range types {
graphqlObj := createGraphqlObj(t, graphqlObjMap, queryFucMap, schemaFucMap)
graphqlObjMap[t.name] = graphqlObj
}
return graphqlObjMap["Query"], nil
}
func createGraphqlObj(t GraphQLParsingType, objMap map[string]*graphql.Object, queryFucMap map[string]graphql.FieldResolveFn, schemaFucMap map[string]graphql.FieldResolveFn) *graphql.Object {
gfs := make(graphql.Fields)
for k, v := range t.fields {
gfs[k] = &graphql.Field{
Name: v.name,
Type: graphqlType(v.typeName, objMap),
Args: graphQLArgs(v.params, objMap),
}
if t.name == "Query" {
fuc, exist := queryFucMap[v.name]
if exist {
gfs[k].Resolve = fuc
}
} else {
fuc, exist := schemaFucMap[v.typeName]
if exist {
gfs[k].Resolve = fuc
}
}
}
return graphql.NewObject(graphql.ObjectConfig{
Name: t.name,
Fields: gfs,
})
}
func graphQLArgs(params []GraphqlParingParam, objMap map[string]*graphql.Object) graphql.FieldConfigArgument {
args := make(graphql.FieldConfigArgument)
for _, p := range params {
p.typeP, _ = extractArgs(p.typeP)
args[p.name] = &graphql.ArgumentConfig{
Type: graphqlType(p.typeP, objMap),
}
}
return args
}
func extractArgs(s string) (string, bool) {
if s[len(s)-1] == '!' {
return s[:len(s)-1], true
}
return s, false
}
func graphqlType(name string, objMap map[string]*graphql.Object) graphql.Output {
switch name {
case "ID":
return graphql.ID
case "String":
return graphql.String
case "Int":
return graphql.Int
case "BigDecimal":
return graphql.Float
case "Boolean":
return graphql.Boolean
case "DateTime":
return graphql.DateTime
default:
return getTypeByName(name, objMap)
}
}
func getTypeByName(name string, objMap map[string]*graphql.Object) graphql.Type {
name = strings.TrimSpace(name)
tname, isArray := extractType(name)
t, exist := objMap[tname]
if !exist {
panic("not find type " + name)
}
structValue := reflect.New(reflect.TypeOf(t).Elem())
structValue.Elem().Set(reflect.ValueOf(t).Elem())
structType, ok := structValue.Interface().(graphql.Type)
if !ok {
return nil
}
if isArray {
return graphql.NewList(structType)
} else {
return structType
}
return nil
}
func extractType(input string) (string, bool) {
pattern := `\[(.*?)\]`
regex := regexp.MustCompile(pattern)
match := regex.FindStringSubmatch(input)
if len(match) > 1 {
return match[1], true
}
return strings.TrimSpace(input), false
}
func parsingField(s string, t string) GraphQLParsingField {
f := GraphQLParsingField{}
f.typeName = t
p1, _ := splitLasLetterPairs(s, ":")
f.name, f.params = parsingFiledParam(p1)
return f
}
var parsingFiledParamRe = regexp.MustCompile(`^([^(]+)(\(([^)]+)\))?`)
func parsingFiledParam(str string) (string, []GraphqlParingParam) {
match := parsingFiledParamRe.FindStringSubmatch(str)
if len(match) > 1 {
name := match[1]
bbb := match[3]
var gpp []GraphqlParingParam
if bbb != "" {
ps := strings.Split(bbb, ",")
for _, p := range ps {
n, t := splitStringPairs(p, ":")
param := GraphqlParingParam{}
param.name = n
param.typeP = t
gpp = append(gpp, param)
}
}
return strings.TrimSpace(name), gpp
} else {
panic("field format error" + str)
}
}
func splitStringPairs(s, sep string) (string, string) {
parts := strings.Split(s, sep)
if len(parts) != 2 {
panic("the string can not split a pairs")
}
return strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1])
}
func splitSpaceAndTabPairs(s string) (string, string) {
parts := strings.FieldsFunc(s, func(r rune) bool {
return r == ' ' || r == '\t'
})
if len(parts) != 2 {
panic("the string can not split a pairs")
}
return strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1])
}
func splitNewLineAndTabPairs(s string) []string {
parts := strings.FieldsFunc(s, func(r rune) bool {
return r == '\r' || r == '\n'
})
return parts
}
func splitLastSpacePairs(s string) (string, string) {
return splitLasLetterPairs(s, " ")
}
func splitLasLetterPairs(s string, sep string) (string, string) {
lastSpaceIndex := strings.LastIndex(s, sep)
if lastSpaceIndex != -1 {
return strings.TrimSpace(s[:lastSpaceIndex]), strings.TrimSpace(s[lastSpaceIndex+1:])
} else {
panic("the string can not split a pairs")
}
}