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lua-ryaml

A fast YAML library written in Rust for Lua using serde-yaml.

Thanks to mlua library, it supports Lua 5.4/5.3/5.2/5.1 (including LuaJIT) without any effort.

Usage

local ryaml = require("ryaml")

local val = ryaml.decode("a: 1")
print(ryaml.encode(val))
-- Prints:
-- ---
-- a: 1

-- Safe interface
local ryaml_safe = require("ryaml.safe")

local t, err = ryaml_safe.decode("[")
assert(t == nil)
print(err)
-- Prints:
-- while parsing a node, did not find expected node content at line 2 column 1

ryaml.decode

Parses YAML document and returns a Lua value. Throws an exception in case of error.

Also available as ryaml.load (alias).

ryaml.encode

Serializes Lua value into a YAML document. Throws an exception in case of error.

Also available as ryaml.dump (alias).

ryaml.null

A lightuserdata, which will be encoded as a NULL value.

local t = {ryaml.null}
print(ryaml.encode(t))
-- Prints:
-- ---
-- - ~

ryaml.array_mt

Tables with this metatable will be systematically encoded it as an Array.

local t = setmetatable({}, ryaml.array_mt)
print(ryaml.encode(t))
-- Prints:
-- ---
-- []

Safe interface

The ryaml.safe interface behaves identically to the ryaml module, except that ryaml.decode/ryaml.encode functions will return nil followed by the error message.