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Improve Bluon documentation

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Lars Mueller 2023-06-01 12:28:21 +02:00
parent 2b1c9cff7c
commit 322da6cf0a
2 changed files with 26 additions and 8 deletions
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2
bluon.lua
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@ -45,7 +45,7 @@ for _, type in ipairs{
{"number", 1};
{"string_constant", 1};
{"string", uint_types};
-- (T0, T8, T16, T32, T64) x (L0, L8, L16, L32, L64)
-- (M0, M8, M16, M32, M64) x (L0, L8, L16, L32, L64)
{"table", (uint_types + 1) ^ 2};
{"reference", uint_types}
} do

32
doc/bluon.md
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@ -44,23 +44,41 @@ Checking whether the stream has been fully consumed by doing `assert(not stream:
## Format
* `nil`: nothing (`""`)
Bluon uses a "tagged union" binary format:
Values are stored as a one-byte tag followed by the contents of the union.
For frequently used "constants", only a tag is used.
`nil` is an exception; since it can't appear in tables, it gets no tag.
If the value to be written by Bluon is `nil`, Bluon simply writes *nothing*.
The following is an enumeration of tag numbers, which are assigned *in this order*.
* `false`: 0
* `true`: 1
* Numbers:
* Constants: 0, nan, +inf, -inf
* Integers: Little endian `U8`, `U16`, `U32`, `U64`, `-U8`, `-U16`, `-U32`, `-U64`
* Integers: Little endian:
* Unsigned: `U8`, `U16`, `U32`, `U64`
* Negative: `-U8`, `-U16`, `-U32`, `-U64`
* Floats: Little endian `F32`, `F64`
* Strings:
* Constant: `""`
* Length as unsigned integer: `T8`, `T16`, `T32`, `T64`
* Length is written as unsigned integer according to the tag: `S8`, `S16`, `S32`, `S64`
* followed by the raw bytes
* Tables:
* List and map part count as unsigned integers
* `L0`, `L8`, `L16`, `L32`, `L64` times `M0`, `M8`, `M16`, `M32`, `M64`
* Tags: `M0`, `M8`, `M16`, `M32`, `M64` times `L0`, `L8`, `L16`, `L32`, `L64`
* `M` is more significant than `L`: The order of the cartesian product is `M0L0`, `M0L1`, ...
* List and map part count encoded as unsigned integers according to the tag,
list part count comes first
* followed by all values in the list part written as Bluon
* followed by all key-value pairs in the map part written as Bluon
(first the key is written as Bluon, then the value)
* Reference:
* Reference ID as unsigned integer: `R8`, `R16`, `R32`, `R64`
* Reserved types:
* Everything <= 55 => 200 free types
* References a previously encountered table or string by an index:
All tables and strings are numbered in the order they occur in the Bluon
* Reserved tags:
* All tags <= 55 are reserved. This gives 200 free tags.
## Features