99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
// Copyright 2019 Drone IO, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package starlark
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import (
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"encoding/json"
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"fmt"
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"io"
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"go.starlark.net/starlark"
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)
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type writer interface {
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io.Writer
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io.ByteWriter
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io.StringWriter
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}
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func write(out writer, v starlark.Value) error {
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if marshaler, ok := v.(json.Marshaler); ok {
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jsonData, err := marshaler.MarshalJSON()
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if err != nil {
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return err
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}
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out.Write(jsonData)
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return nil
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}
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switch v := v.(type) {
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case starlark.NoneType:
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out.WriteString("null")
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case starlark.Bool:
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fmt.Fprintf(out, "%t", v)
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case starlark.Int:
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out.WriteString(v.String())
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case starlark.Float:
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fmt.Fprintf(out, "%g", v)
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case starlark.String:
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s := string(v)
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if isQuoteSafe(s) {
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fmt.Fprintf(out, "%q", s)
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} else {
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data, _ := json.Marshal(s)
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out.Write(data)
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}
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case starlark.Indexable:
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out.WriteByte('[')
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for i, n := 0, starlark.Len(v); i < n; i++ {
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if i > 0 {
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out.WriteString(", ")
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}
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if err := write(out, v.Index(i)); err != nil {
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return err
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}
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}
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out.WriteByte(']')
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case *starlark.Dict:
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out.WriteByte('{')
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for i, itemPair := range v.Items() {
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key := itemPair[0]
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value := itemPair[1]
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if i > 0 {
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out.WriteString(", ")
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}
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if err := write(out, key); err != nil {
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return err
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}
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out.WriteString(": ")
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if err := write(out, value); err != nil {
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return err
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}
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}
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out.WriteByte('}')
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default:
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return fmt.Errorf("value %s (type `%s') can't be converted to JSON", v.String(), v.Type())
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}
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return nil
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}
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func isQuoteSafe(s string) bool {
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for _, r := range s {
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if r < 0x20 || r >= 0x10000 {
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return false
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}
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}
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return true
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}
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