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‎LICENSE.txt

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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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and distribution as defined by Sections 1 through 9 of this document.
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"Licensor" shall mean the copyright owner or entity authorized by
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the copyright owner that is granting the License.
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"Legal Entity" shall mean the union of the acting entity and all
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other entities that control, are controlled by, or are under common
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control with that entity. For the purposes of this definition,
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"control" means (i) the power, direct or indirect, to cause the
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direction or management of such entity, whether by contract or
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outstanding shares, or (iii) beneficial ownership of such entity.
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exercising permissions granted by this License.
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"Work" shall mean the work of authorship, whether in Source or
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"Derivative Works" shall mean any work, whether in Source or Object
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any Contribution intentionally submitted for inclusion in the Work
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Notwithstanding the above, nothing herein shall supersede or modify
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the terms of any separate license agreement you may have executed
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with Licensor regarding such Contributions.
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6. Trademarks. This License does not grant permission to use the trade
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names, trademarks, service marks, or product names of the Licensor,
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except as required for reasonable and customary use in describing the
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origin of the Work and reproducing the content of the NOTICE file.
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7. Disclaimer of Warranty. Unless required by applicable law or
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agreed to in writing, Licensor provides the Work (and each
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Contributor provides its Contributions) on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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implied, including, without limitation, any warranties or conditions
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
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PARTICULAR PURPOSE. You are solely responsible for determining the
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appropriateness of using or redistributing the Work and assume any
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risks associated with Your exercise of permissions under this License.
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8. Limitation of Liability. In no event and under no legal theory,
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whether in tort (including negligence), contract, or otherwise,
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unless required by applicable law (such as deliberate and grossly
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incidental, or consequential damages of any character arising as a
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result of this License or out of the use or inability to use the
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Work (including but not limited to damages for loss of goodwill,
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work stoppage, computer failure or malfunction, or any and all
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other commercial damages or losses), even if such Contributor
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has been advised of the possibility of such damages.
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9. Accepting Warranty or Additional Liability. While redistributing
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and charge a fee for, acceptance of support, warranty, indemnity,
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or other liability obligations and/or rights consistent with this
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License. However, in accepting such obligations, You may act only
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on Your own behalf and on Your sole responsibility, not on behalf
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of any other Contributor, and only if You agree to indemnify,
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defend, and hold each Contributor harmless for any liability
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incurred by, or claims asserted against, such Contributor by reason
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of your accepting any such warranty or additional liability.
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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boilerplate notice, with the fields enclosed by brackets "[]"
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replaced with your own identifying information. (Don't include
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the brackets!) The text should be enclosed in the appropriate
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comment syntax for the file format. We also recommend that a
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file or class name and description of purpose be included on the
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identification within third-party archives.
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Copyright [2015-] [Tomo Krajina]
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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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http://www.apache.org/licenses/LICENSE-2.0
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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.

‎README.md

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# A Golang JSON to TypeScript model converter
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converter := typescriptify.New()
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converter.Add(Person{})
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converter.Add(Dummy{})
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err := converter.ConvertToFile("ts/models.ts")
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if err != nil {
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panic(err.Error())
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}
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If the `Person` structs contain a reference to the `Address` struct, then you don't have to add `Address` explicitly. Only fields with a valid `json` tag will be converted to TypeScript models.
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Example input structs:
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type Address struct {
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// Used in html
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Duration float64 `json:"duration"`
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Text1 string `json:"text,omitempty"`
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// Ignored:
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Text2 string `json:",omitempty"`
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Text3 string `json:"-"`
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}
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type Dummy struct {
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Something string `json:"something"`
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}
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type Person struct {
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Name string `json:"name"`
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Nicknames []string `json:"nicknames"`
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Addresses []Address `json:"addresses"`
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Dummy Dummy `json:"a"`
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}
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Generated TypeScript:
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class Dummy {
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something : string;
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}
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class Address {
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duration : number;
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text : string;
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}
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class Person {
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name : string;
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nicknames : string[];
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addresses : Address[];
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a : Dummy;
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}
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In TypeScript you can just cast your JSON in any of those models:
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var json = <Person> {"name":"Me myself","nicknames":["aaa", "bbb"]};
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console.log(json.name);
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// The TypeScript compiler will throw an error for this line
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console.log(json.something);
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Any custom code can be added to Typescript models:
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class Address {
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street : string;
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no : number;
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//[Address:]
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country: string;
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getStreetAndNumber() {
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return street + " " + number;
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}
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//[end]
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}
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The lines between `//[Address:]` and `//[end]` will be left intact after `ConvertToFile()`.
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If you use golang JSON structs as responses from your API, you may want to have a common prefix for all the generated models:
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converter := typescriptify.New()
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converter.Prefix("API_")
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converter.Add(Person{})
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The model name will be `API_Person` instead of `Person`.
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License
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-------
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This library is licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
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‎example.go

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package main
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import "github.com/tkrajina/typescriptify-golang-structs/typescriptify"
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type Address struct {
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// Used in html
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City float64 `json:"city"`
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Country string `json:"country,omitempty"`
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}
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type Person struct {
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Name string `json:"name"`
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Nicknames []string `json:"nicknames"`
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Addresses []Address `json:"addresses"`
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}
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func main() {
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converter := typescriptify.New()
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converter.Add(Person{})
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err := converter.ConvertToFile("example_output.ts")
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if err != nil {
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panic(err.Error())
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}
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}

‎example_output.ts

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/* Do not change, this code is generated from Golang structs */
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class Address {
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city: number;
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country: string;
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//[Address:]
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/* Custom code here */
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anyField: string;
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//[end]
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}
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class Person {
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name: string;
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nicknames: string[];
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addresses: Address[];
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//[Person:]
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//[end]
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}

‎typescriptify/typescriptify.go

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package typescriptify
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"reflect"
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"strings"
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)
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type TypeScriptify struct {
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prefix string
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suffix string
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golangTypes []reflect.Type
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types map[reflect.Kind]string
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indent string
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// throwaway, used when converting
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alreadyConverted map[reflect.Type]bool
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}
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func New() *TypeScriptify {
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result := new(TypeScriptify)
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result.indent = "\t"
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types := make(map[reflect.Kind]string)
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types[reflect.Bool] = "boolean"
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types[reflect.Int] = "number"
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types[reflect.Int8] = "number"
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types[reflect.Int16] = "number"
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types[reflect.Int32] = "number"
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types[reflect.Int64] = "number"
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types[reflect.Uint] = "number"
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types[reflect.Uint8] = "number"
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types[reflect.Uint16] = "number"
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types[reflect.Uint32] = "number"
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types[reflect.Uint64] = "number"
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types[reflect.Float32] = "number"
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types[reflect.Float64] = "number"
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types[reflect.String] = "string"
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result.types = types
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return result
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}
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func (this TypeScriptify) getTypescriptFieldLine(fieldName string, kind reflect.Kind, array bool) (string, error) {
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arr := ""
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if array {
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arr = "[]"
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}
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if typeScriptType, ok := this.types[kind]; ok {
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if len(fieldName) > 0 {
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return fmt.Sprintf("%s%s: %s%s;\n", this.indent, fieldName, typeScriptType, arr), nil
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}
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}
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return "", errors.New(fmt.Sprintf("don't know how to translate type %s (field:%s)", kind.String(), fieldName))
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}
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func (this *TypeScriptify) Indent(indent string) {
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this.indent = indent
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}
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func (this *TypeScriptify) Prefix(prefix string) {
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this.prefix = prefix
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}
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func (this *TypeScriptify) Suffix(suffix string) {
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this.suffix = suffix
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}
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func (this *TypeScriptify) Add(obj interface{}) {
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this.AddType(reflect.TypeOf(obj))
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}
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func (this *TypeScriptify) AddType(typeOf reflect.Type) {
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this.golangTypes = append(this.golangTypes, typeOf)
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}
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func (this *TypeScriptify) Convert(customCode map[string]string) (string, error) {
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this.alreadyConverted = make(map[reflect.Type]bool)
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result := ""
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for _, typeof := range this.golangTypes {
89+
typeScriptCode, err := this.convertType(typeof, customCode)
90+
if err != nil {
91+
return "", err
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}
93+
result += "\n" + strings.Trim(typeScriptCode, " "+this.indent+"\r\n")
94+
}
95+
return result, nil
96+
}
97+
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func loadCustomCode(fileName string) (map[string]string, error) {
99+
result := make(map[string]string)
100+
f, err := os.Open(fileName)
101+
if err != nil {
102+
if os.IsNotExist(err) {
103+
return result, nil
104+
}
105+
return result, err
106+
}
107+
defer f.Close()
108+
109+
bytes, err := ioutil.ReadAll(f)
110+
if err != nil {
111+
return result, err
112+
}
113+
114+
var currentName string
115+
var currentValue string
116+
lines := strings.Split(string(bytes), "\n")
117+
for _, line := range lines {
118+
trimmedLine := strings.TrimSpace(line)
119+
if strings.HasPrefix(trimmedLine, "//[") && strings.HasSuffix(trimmedLine, ":]") {
120+
currentName = strings.Replace(strings.Replace(trimmedLine, "//[", "", -1), ":]", "", -1)
121+
currentValue = ""
122+
} else if trimmedLine == "//[end]" {
123+
result[currentName] = currentValue
124+
currentName = ""
125+
currentValue = ""
126+
} else if len(currentName) > 0 {
127+
currentValue += line + "\n"
128+
}
129+
}
130+
131+
return result, nil
132+
}
133+
134+
func (this TypeScriptify) ConvertToFile(fileName string) error {
135+
customCode, err := loadCustomCode(fileName)
136+
if err != nil {
137+
return err
138+
}
139+
140+
f, err := os.Create(fileName)
141+
if err != nil {
142+
return err
143+
}
144+
defer f.Close()
145+
146+
converted, err := this.Convert(customCode)
147+
if err != nil {
148+
return err
149+
}
150+
151+
f.WriteString("/* Do not change, this code is generated from Golang structs */\n\n")
152+
f.WriteString(converted)
153+
if err != nil {
154+
return err
155+
}
156+
157+
return nil
158+
}
159+
160+
func (this *TypeScriptify) convertType(typeOf reflect.Type, customCode map[string]string) (string, error) {
161+
entityName := fmt.Sprintf("%s%s%s", this.prefix, this.suffix, typeOf.Name())
162+
result := fmt.Sprintf("class %s {\n", entityName)
163+
164+
if _, found := this.alreadyConverted[typeOf]; found {
165+
// Already converted
166+
return "", nil
167+
}
168+
169+
for i := 0; i < typeOf.NumField(); i++ {
170+
val := typeOf.Field(i)
171+
//fmt.Println("kind=", val.Type.Kind().String())
172+
jsonTag := val.Tag.Get("json")
173+
jsonFieldName := ""
174+
if len(jsonTag) > 0 {
175+
jsonTagParts := strings.Split(jsonTag, ",")
176+
if len(jsonTagParts) > 0 {
177+
jsonFieldName = strings.Trim(jsonTagParts[0], this.indent)
178+
}
179+
}
180+
if len(jsonFieldName) > 0 && jsonFieldName != "-" {
181+
if val.Type.Kind() == reflect.Struct {
182+
// Struct:
183+
typeScriptChunk, err := this.convertType(val.Type, customCode)
184+
if err != nil {
185+
return "", err
186+
}
187+
result = typeScriptChunk + "\n" + result + fmt.Sprintf("%s%s: %s;\n", this.indent, jsonFieldName, val.Type.Name())
188+
} else if val.Type.Kind() == reflect.Slice {
189+
// Slice:
190+
if val.Type.Elem().Kind() == reflect.Struct {
191+
// Slice of structs:
192+
typeScriptChunk, err := this.convertType(val.Type.Elem(), customCode)
193+
if err != nil {
194+
return "", err
195+
}
196+
result = typeScriptChunk + "\n" + result + fmt.Sprintf("%s%s: %s[];\n", this.indent, jsonFieldName, val.Type.Elem().Name())
197+
} else {
198+
// Slice of simple fields:
199+
line, err := this.getTypescriptFieldLine(jsonFieldName, val.Type.Elem().Kind(), true)
200+
if err != nil {
201+
return "", err
202+
}
203+
result += line
204+
}
205+
} else {
206+
// simple field:
207+
line, err := this.getTypescriptFieldLine(jsonFieldName, val.Type.Kind(), false)
208+
if err != nil {
209+
return "", err
210+
}
211+
result += line
212+
}
213+
}
214+
}
215+
216+
if customCode != nil {
217+
code := customCode[entityName]
218+
result += this.indent + "//[" + entityName + ":]\n" + code + "\n" + this.indent + "//[end]\n"
219+
}
220+
221+
result += "}"
222+
223+
this.alreadyConverted[typeOf] = true
224+
225+
return result, nil
226+
}

‎typescriptify/typescriptify_test.go

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1+
package typescriptify
2+
3+
import (
4+
"fmt"
5+
"os"
6+
"reflect"
7+
"strings"
8+
"testing"
9+
)
10+
11+
type Address struct {
12+
// Used in html
13+
Duration float64 `json:"duration"`
14+
Text1 string `json:"text,omitempty"`
15+
// Ignored:
16+
Text2 string `json:",omitempty"`
17+
Text3 string `json:"-"`
18+
}
19+
20+
type Dummy struct {
21+
Something string `json:"something"`
22+
}
23+
24+
type Person struct {
25+
Name string `json:"name"`
26+
Nicknames []string `json:"nicknames"`
27+
Addresses []Address `json:"addresses"`
28+
Dummy Dummy `json:"a"`
29+
}
30+
31+
func TestTypescriptifyWithTypes(t *testing.T) {
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converter := New()
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converter.AddType(reflect.TypeOf(Person{}))
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desiredResult := `class Dummy {
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something : string;
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}
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class Address {
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duration : number;
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text : string;
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}
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class Person {
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name : string;
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nicknames : string[];
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addresses : Address[];
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a : Dummy;
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}`
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testConverter(t, converter, desiredResult)
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}
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func TestTypescriptifyWithInstances(t *testing.T) {
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converter := New()
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converter.Add(Person{})
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converter.Add(Dummy{})
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desiredResult := `class Dummy {
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something : string;
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}
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class Address {
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duration : number;
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text : string;
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}
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class Person {
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name : string;
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nicknames : string[];
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addresses : Address[];
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a : Dummy;
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}`
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testConverter(t, converter, desiredResult)
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}
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func TestTypescriptifyWithDoubleClasses(t *testing.T) {
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converter := New()
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converter.AddType(reflect.TypeOf(Person{}))
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converter.AddType(reflect.TypeOf(Person{}))
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desiredResult := `class Dummy {
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something : string;
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}
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class Address {
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duration : number;
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text : string;
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}
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class Person {
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name : string;
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nicknames : string[];
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addresses : Address[];
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a : Dummy;
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}`
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testConverter(t, converter, desiredResult)
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}
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func TestWithPrefixes(t *testing.T) {
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converter := New()
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converter.Prefix("test_")
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converter.Add(Address{})
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converter.Add(Dummy{})
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desiredResult := `class test_Address {
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duration : number;
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text : string;
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}
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class test_Dummy {
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something : string;
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}`
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testConverter(t, converter, desiredResult)
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}
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func testConverter(t *testing.T, converter *TypeScriptify, desiredResult string) {
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typeScriptCode, err := converter.Convert(nil)
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if err != nil {
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panic(err.Error())
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}
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typeScriptCode = strings.Trim(typeScriptCode, " \t\n\r")
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if typeScriptCode != desiredResult {
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lines1 := strings.Split(typeScriptCode, "\n")
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lines2 := strings.Split(desiredResult, "\n")
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if len(lines1) != len(lines2) {
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os.Stderr.WriteString(fmt.Sprintf("Lines: %d != %d\n", len(lines1), len(lines2)))
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os.Stderr.WriteString(fmt.Sprintf("Expected:\n%s\n\nGot:\n%s\n", desiredResult, typeScriptCode))
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t.Fail()
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} else {
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for i := 0; i < len(lines1); i++ {
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line1 := strings.Trim(lines1[i], " \t\r\n")
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line2 := strings.Trim(lines2[i], " \t\r\n")
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if line1 != line2 {
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os.Stderr.WriteString(fmt.Sprintf("%d. line don't match: `%s` != `%s`\n", line1, line2))
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os.Stderr.WriteString(fmt.Sprintf("Expected:\n%s\n\nGot:\n%s\n", desiredResult, typeScriptCode))
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t.Fail()
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}
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}
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}
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}
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}

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