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https://github.com/mattyhall/tomlz

A well-tested TOML parsing library for Zig
https://github.com/mattyhall/tomlz

parsing toml zig

Last synced: 29 days ago
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A well-tested TOML parsing library for Zig

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README 

        
# tomlz



A TOML parser for Zig targeting TOML v1.0.0, an easy API and safety.

Also supports encoding/serializing values(implemented by @0x5a4)!



```zig

const std = @import("std")

const tomlz = @import("tomlz")



var gpa = std.heap.page_allocator;

var table = try tomlz.parse(gpa,

    \\foo = 1

    \\bar = 2

);

defer table.deinit(gpa);



table.getInteger("foo").?; // 1



// --- or ---

const S = struct { foo: i64, bar: i64 };

const s = try tomlz.decode(S, gpa,

  \\foo = 1

  \\bar = 2

);



// serialize a value like this (also see the examples)

try tomlz.serialize(

    gpa,

    std.io.getStdout.writer()

    s,

);

// foo = 1

// bar = 2

```



## Current status



All types other than datetimes are supported. We pass 321/334 of the

[toml tests](https://github.com/BurntSushi/toml-test) 11 of those are due to not

having datetime support and the other two are minor lexing issues (allowing

whitespace between the square brackets of an array header).



We allow both parsing into a special TOML type, a `Table`, but also support

decoding into a struct directly - including types that must be allocated like

arrays and strings.



The Serializer allows encoding every kind of zig type, overwriting it's default behaviour

by implementing a function called `tomlzSerialize`, has the option to work

without an allocator and can therefore even work at `comptime`!

Note that for some types like `std.HashMap` its not possible to just encode

all their fields, so custom logic is needed. We can't provide this, but it's not

too difficult to implement it yourself(See examples).



## Installation



tomlz supports being included as a module.



Create a file called `build.zig.zon` if you do not already have one, and add `tomlz` as a dependency



```

.{

    .name = "myproject",

    .version = "0.1.0",

    .dependencies = .{

        .tomlz = .{

            .url = "https://github.com/mattyhall/tomlz/archive/.tar.gz",

            .hash = "12206cf9e90462ee6e14f593ea6e0802b9fe434429ba10992a1451e32900f741005c",

        },

    }

}

```



You'll have to replace the `` part with an actual, recent commit-hash.

The hash also needs changing, but `zig build` will complain and give you the correct one.



In your `build.zig` file create and use the dependency



```

pub fn build(b: *std.Build) void {

    // ... setup ...



    const tomlz = b.dependency("tomlz", .{

        .target = target,

        .optimize = optimize,

    });



    // add the tomlz module

    exe.root_module.addImport("tomlz", tomlz.module("tomlz"));



    // .. continue ...

}

```



## Usage



### Table



We currently provide a single entry point for parsing which returns a toml

`Table` type. This type has helper methods for getting values out:



```zig

const std = @import("std");

const tomlz = @import("tomlz");



var gpa = std.heap.page_allocator;

var table = try tomlz.parse(gpa,

    \\int = 1

    \\float = 2.0

    \\boolean = true

    \\string = "hello, world"

    \\array = [1, 2, 3]

    \\table = { subvalue = 1, we.can.nest.keys = 2 }

);

defer table.deinit(gpa);



table.getInteger("int");

table.getFloat("float");

table.getBool("boolean");

table.getString("string");

table.getArray("array");

table.getTable("table");

```



A simple example is

[provided](https://github.com/mattyhall/tomlz/tree/main/examples/simple/).



### Decode



```zig

const std = @import("std");

const tomlz = @import("tomlz");



var gpa = std.heap.page_allocator;

const TripleCrowns = struct { worlds: i64, masters: i64, uks: i64 };



const Player = struct {

    name: []const u8,

    age: i64,

    hobbies: []const []const u8,

    triplecrowns: TripleCrowns,



    const Self = @This();



    pub fn deinit(self: *Self, gpa: std.mem.Allocator) void {

        gpa.free(self.name);



        for (self.hobbies) |hobby| {

            gpa.free(hobby);

        }

        gpa.free(self.hobbies);

    }

};



const Game = struct {

    name: []const u8,

    goat: Player,



    const Self = @This();



    pub fn deinit(self: *Self, gpa: std.mem.Allocator) void {

        gpa.free(self.name);

        self.goat.deinit(gpa);

    }

};



var s = try tomlz.decode(Game, gpa,

    \\name = "snooker"

    \\

    \\[goat]

    \\name = "Ronnie o' Sullivan"

    \\age = 46 # as of Nov 2022

    \\hobbies = ["running", "hustling at pool"]

    \\

    \\[goat.triplecrowns]

    \\worlds = 7

    \\masters = 7

    \\uks = 7

);

defer s.deinit(gpa);

```



### Encode



Have a look at [the example](examples/serialize/src/main.zig).



## Goals and non-goals



Goals and non-goals are subject to change based on how the project is used and

my own time constraints. If you feel a goal or non-goal isn't quite right please

open an issue and we can discuss it.



### Goals



- TOML v1.0.0. The datetime portion of this is probably going to be

  unachievable until Zig gets a good standard library type for it or a library

  gets dominance. Other than that however we should pass all the

  [tests](https://github.com/BurntSushi/toml-test)

- A nice API. Getting values from the `Value` type should be painless as

  possible and we should also provide deserialising a `Table` into a struct,

  similarly to how `std.json` does it

- Easy installation. We should try to make using the library as a vendored

  dependency and as a package - on e.g. [gyro](https://github.com/mattnite/gyro)

  \- as easy as possible

- Safety. The parser should never crash no matter the input. To achieve this we

  should run fuzzing against it

- Support Zig master and the latest tagged release until Zig v1.0. This will be

  done by having the main branch track Zig master and a branch for each Zig

  release. Any improvements should be backported to the most recent release

  branch

- Good error messages



### Non-goals



- Super duper performance. We want to be as performant as possible without

  making the code harder to read. It is unlikely that parsing a TOML file is

  going to be the bottleneck in your application so "good" performance should be

  sufficient

- Previous versions of TOML