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// Copyright 2019 CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openapi
import (
"fmt"
"github.com/cockroachdb/apd/v3"
"cuelang.org/go/cue"
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/literal"
"cuelang.org/go/cue/token"
)
// See https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.0.md#data-types
var cueToOpenAPI = map[string]string{
"int32": "int32",
"int64": "int64",
"float64": "double",
"float32": "float",
"bytes": "binary",
"time.Time()": "date-time",
"time.Time": "date-time",
`time.Format ("2006-01-02")`: "date",
// TODO: if a format is more strict (e.g. using zeros instead of nines
// for fractional seconds), we could still use this as an approximation.
`time.Format ("2006-01-02T15:04:05.999999999Z07:00")`: "date-time",
// TODO: password.
">=-2147483648 & <=2147483647 & int": "int32",
">=-9223372036854775808 & <=9223372036854775807 & int": "int64",
">=-340282346638528859811704183484516925440.0 & <=340282346638528859811704183484516925440.0": "float",
">=-1.797693134862315708145274237317043567981e+308 & <=1.797693134862315708145274237317043567981e+308": "double",
}
func extractFormat(v cue.Value) string {
switch k := v.IncompleteKind(); {
case k&cue.NumberKind != 0, k&cue.StringKind != 0, k&cue.BytesKind != 0:
default:
return ""
}
var arg string
if op, a := v.Expr(); op == cue.CallOp {
v = a[0]
if len(a) == 2 {
arg = fmt.Sprintf(" (%v)", a[1].Eval())
}
}
expr := fmt.Sprint(v.Eval(), arg)
if s, ok := cueToOpenAPI[expr]; ok {
return s
}
s := fmt.Sprint(v)
return cueToOpenAPI[s]
}
func getDeprecated(v cue.Value) bool {
// only looking at protobuf attribute for now.
a := v.Attribute("protobuf")
r, _ := a.Flag(1, "deprecated")
return r
}
func simplify(b *builder, t *ast.StructLit) {
if b.format == "" {
return
}
switch b.typ {
case "number", "integer":
simplifyNumber(t, b.format)
}
}
func simplifyNumber(t *ast.StructLit, format string) string {
fields := t.Elts
k := 0
for i, d := range fields {
switch label(d) {
case "minimum":
if decimalEqual(minMap[format], value(d)) {
continue
}
case "maximum":
if decimalEqual(maxMap[format], value(d)) {
continue
}
}
fields[k] = fields[i]
k++
}
t.Elts = fields[:k]
return format
}
func decimalEqual(d *apd.Decimal, v ast.Expr) bool {
if d == nil {
return false
}
lit, ok := v.(*ast.BasicLit)
if !ok || (lit.Kind != token.INT && lit.Kind != token.FLOAT) {
return false
}
n := literal.NumInfo{}
if literal.ParseNum(lit.Value, &n) != nil {
return false
}
var b apd.Decimal
if n.Decimal(&b) != nil {
return false
}
return d.Cmp(&b) == 0
}
func mustDecimal(s string) *apd.Decimal {
d, _, err := apd.NewFromString(s)
if err != nil {
panic(err)
}
return d
}
var (
minMap = map[string]*apd.Decimal{
"int32": mustDecimal("-2147483648"),
"int64": mustDecimal("-9223372036854775808"),
"float": mustDecimal("-3.40282346638528859811704183484516925440e+38"),
"double": mustDecimal("-1.797693134862315708145274237317043567981e+308"),
}
maxMap = map[string]*apd.Decimal{
"int32": mustDecimal("2147483647"),
"int64": mustDecimal("9223372036854775807"),
"float": mustDecimal("+3.40282346638528859811704183484516925440e+38"),
"double": mustDecimal("+1.797693134862315708145274237317043567981e+308"),
}
)
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