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https://github.com/appgurueu/modlib.git
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158 lines
4.6 KiB
Markdown
158 lines
4.6 KiB
Markdown
# Modding Library (`modlib`)
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Multipurpose Minetest Modding Library
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## About
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No dependencies. Licensed under the MIT License. Written by Lars Mueller aka LMD or appguru(eu).
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## API
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Mostly self-documenting code. Mod namespace is `modlib` or `_ml`, containing all variables & functions.
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### Bluon
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Binary Lua object notation. **Experimental.** Handling of subnormal numbers (very small floats) may be broken.
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#### `new(def)`
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```lua
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def = {
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aux_is_valid = function(object)
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return is_valid
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end,
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aux_len = function(object)
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return length_in_bytes
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end,
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-- read type byte, stream providing :read(count), map of references -> id
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aux_read = function(type, stream, references)
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... = stream:read(...)
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return object
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end,
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-- object to be written, stream providing :write(text), list of references
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aux_write = function(object, stream, references)
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stream:write(...)
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end
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}
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```
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#### `:is_valid(object)`
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Returns whether the given object can be represented by the instance as boolean.
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#### `:len(object)`
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Returns the expected length of the object if serialized by the current instance in bytes.
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#### `:write(object, stream)`
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Writes the object to a stream supporting `:write(text)`. Throws an error if invalid.
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#### `:read(stream)`
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Reads a single bluon object from a stream supporting `:read(count)`. Throws an error if invalid bluon.
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Checking whether the stream has been fully consumed by doing `assert(not stream:read(1))` is left up to the user.
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#### Format
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* `nil`: nothing (`""`)
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* `false`: 0
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* `true`: 1
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* Numbers:
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* Constants: 0, nan, +inf, -inf
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* Integers: Little endian `U8`, `U16`, `U32`, `U64`, `-U8`, `-U16`, `-U32`, `-U64`
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* Floats: Little endian `F32`, `F64`
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* Strings:
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* Constant: `""`
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* Length as unsigned integer: `T8`, `T16`, `T32`, `T64`
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* Tables:
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* List and map part count as unsigned integers
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* `L0`, `L8`, `L16`, `L32`, `L64` times `M0`, `M8`, `M16`, `M32`, `M64`
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* Reference:
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* Reference ID as unsigned integer: `R8`, `R16`, `R32`, `R64`
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* Reserved types:
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* Everything <= 55 => 200 free types
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#### Features
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* Embeddable: Written in pure Lua
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* Storage efficient: No duplication of strings or reference-equal tables
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* Flexible: Can serialize circular references and strings containing null
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#### Simple example
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```lua
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local object = ...
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-- Write to file
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local file = io.open(..., "w")
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modlib.bluon:write(object, file)
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file:close()
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-- Write to text
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local rope = modlib.table.rope{}
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modlib.bluon:write(object, rope)
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text = rope:to_text()
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-- Read from text
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local inputstream = modlib.text.inputstream"\1"
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assert(modlib.bluon:read(object, rope) == true)
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```
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#### Advanced example
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```lua
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-- Serializes all userdata to a constant string:
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local custom_bluon = bluon.new{
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aux_is_valid = function(object)
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return type(object) == "userdata"
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end,
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aux_len = function(object)
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return 1 + ("userdata"):len())
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end,
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aux_read = function(type, stream, references)
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assert(type == 100, "unsupported type")
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assert(stream:read(("userdata"):len()) == "userdata")
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return userdata()
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end,
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-- object to be written, stream providing :write(text), list of references
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aux_write = function(object, stream, references)
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assert(type(object) == "userdata")
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stream:write"\100userdata"
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end
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}
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-- Write to text
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local rope = modlib.table.rope{}
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custom_bluon:write(userdata(), rope)
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assert(rope:to_text() == "\100userdata")
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```
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## Configuration
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### Legacy
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1. Configuration is loaded from `<worldpath>/config/<modname>.<extension>`, the following extensions are supported and loaded (in the given order), with loaded configurations overriding properties of previous ones:
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1. [`json`](https://json.org)
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2. [`lua`](https://lua.org)
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3. [`luon`](https://github.com/appgurueu/luon), Lua but without the `return`
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4. [`conf`](https://github.com/minetest/minetest/blob/master/doc/lua_api.txt)
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2. Settings are loaded from `minetest.conf` and override configuration values
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### Locations
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0. Default configuration: `<modfolder>/conf.lua`
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1. World configuration: `config/<modname>.<format>`
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2. Mod configuration: `<modfolder>/conf.<format>`
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3. Minetest configuration: `minetest.conf`
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### Formats
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1. [`lua`](https://lua.org)
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* Lua, with the environment being the configuration object
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* `field = value` works
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* Return new configuration object to replace
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2. [`luon`](https://github.com/appgurueu/luon)
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* Single Lua literal
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* Booleans, numbers, strings and tables
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3. [`conf`](https://github.com/minetest/minetest/blob/master/doc/lua_api.txt)
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* Minetest-like configuration files
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4. [`json`](https://json.org)
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* Not recommended |