/
utils.go
72 lines (60 loc) · 1.19 KB
/
utils.go
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package graph
import (
"bytes"
"errors"
"io"
"strings"
"text/scanner"
)
type FPInfo struct {
Operation string
Name string
}
func FastParse(gql string) (h FPInfo, err error) {
if gql == "" {
return h, errors.New("query missing or empty")
}
return fastParse(strings.NewReader(gql))
}
func FastParseBytes(gql []byte) (h FPInfo, err error) {
if len(gql) == 0 {
return h, errors.New("query missing or empty")
}
return fastParse(bytes.NewReader(gql))
}
func fastParse(r io.Reader) (h FPInfo, err error) {
var s scanner.Scanner
s.Init(r)
s.Whitespace ^= 1 << '\n' // don't skip new lines
comment := false
n := 0
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
t := s.TokenText()
switch {
case t == "#":
comment = true
continue
case t == "\n":
comment = false
continue
case comment:
continue
}
if h.Operation == "" {
if n == 0 && t == "{" {
h.Operation = "query"
return
}
if t == "query" || t == "mutation" || t == "subscription" {
h.Operation = t
}
} else {
if t != "{" && t != "(" && t != "@" {
h.Name = t
}
return h, nil
}
n++
}
return h, errors.New("invalid query: query type and name not found")
}