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[WIP] [toml/en] Add TOML support (#2282)

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* Init support for TOML

* Add scalar types section

* Move comment to key value

* Improve introduction

* Move int comment to int key value

* Add array support

* Add version warning

* Add support for table

* Add inline table part

* Add support array of table part

* Fix bugs/typos to follow the review

* Improve sub tables example

* Fix wrong quotes on multiLineLiteralString

* Fix letter case for coherence

* Remove old comment

* Move from variety to color

Thanks @robochat
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---
language: toml
filename: learntoml.toml
contributors:
- ["Alois de Gouvello", "https://github.com/aloisdg"]
---
TOML stands for Tom's Obvious, Minimal Language. It is a data serialisation language designed to be a minimal configuration file format that's easy to read due to obvious semantics.
It is an alternative to YAML and JSON. It aims to be more human friendly than JSON and simpler that YAML. TOML is designed to map unambiguously to a hash table. TOML should be easy to parse into data structures in a wide variety of languages.
Be warned, TOML's spec is still changing a lot. Until it's marked as 1.0, you
should assume that it is unstable and act accordingly. This document follows TOML v0.4.0.
```toml
# Comments in TOML look like this.
################
# SCALAR TYPES #
################
# Our root object (which continues for the entire document) will be a map,
# which is equivalent to a dictionary, hash or object in other languages.
# The key, equals sign, and value must be on the same line
# (though some values can be broken over multiple lines).
key = "value"
string = "hello"
number = 42
float = 3.14
boolean = true
dateTime = 1979-05-27T07:32:00-08:00
scientificNotation = 1e+12
"key can be quoted" = true # Both " and ' are fine
"key may contains" = "letters, numbers, underscores, and dashes"
# A bare key must be non-empty, but an empty quoted key is allowed
"" = "blank" # VALID but discouraged
'' = 'blank' # VALID but discouraged
##########
# String #
##########
# All strings must contain only valid UTF-8 characters.
# We can escape characters and some of them have a compact escape sequence.
# For example, \t add a tabulation. Refers to the spec to get all of them.
basicString = "are surrounded by quotation marks. \"I'm quotable\". Name\tJos"
multiLineString = """
are surrounded by three quotation marks
on each side and allow newlines."""
literalString = 'are surrounded by single quotes. Escaping are not allowed.'
multiLineLiteralString = '''
are surrounded by three single quotes on each side
and allow newlines. Still no escaping.
The first newline is trimmed in raw strings.
All other whitespace
is preserved. #! are preserved?
'''
# For binary data it is recommended that you use Base64, another ASCII or UTF8
# encoding. The handling of that encoding will be application specific.
###########
# Integer #
###########
## Integers can start with a +, a - or nothing.
## Leading zeros are not allowed. Hex, octal, and binary forms are not allowed.
## Values that cannot be expressed as a series of digits are not allowed.
int1 = +42
int2 = 0
int3 = -21
integerRange = 64
## You can use underscores to enhance readability. Each
## underscore must be surrounded by at least one digit.
int4 = 5_349_221
int5 = 1_2_3_4_5 # VALID but discouraged
#########
# Float #
#########
# Floats are an integer followed by a fractional and/or an exponent part.
flt1 = 3.1415
flt2 = -5e6
flt3 = 6.626E-34
###########
# Boolean #
###########
bool1 = true
bool2 = false
boolMustBeLowercase = true
############
# Datetime #
############
date1 = 1979-05-27T07:32:00Z # follows the RFC 3339 spec
date2 = 1979-05-27T07:32:00 # without offset
date3 = 1979-05-27 # without offset nor time
####################
# COLLECTION TYPES #
####################
#########
# Array #
#########
array1 = [ 1, 2, 3 ]
array2 = [ "Commas", "are", "delimiters" ]
array3 = [ "Don't mixed", "different", "types" ]
array4 = [ [ 1.2, 2.4 ], ["all", 'strings', """are the same""", '''type'''] ]
array5 = [
"Whitespace", "is", "ignored"
]
#########
# Table #
#########
# Tables (or hash tables or dictionaries) are collections of key/value
# pairs. They appear in square brackets on a line by themselves.
# Empty tables are allowed and simply have no key/value pairs within them.
[table]
# Under that, and until the next table or EOF are the key/values of that table.
# Key/value pairs within tables are not guaranteed to be in any specific order.
[table-1]
key1 = "some string"
key2 = 123
[table-2]
key1 = "another string"
key2 = 456
# Dots are prohibited in bare keys because dots are used to signify nested tables.
# Naming rules for each dot separated part are the same as for keys.
[dog."tater.man"]
type = "pug"
# In JSON land, that would give you the following structure:
# { "dog": { "tater.man": { "type": "pug" } } }
# Whitespace around dot-separated parts is ignored, however, best practice is to
# not use any extraneous whitespace.
[a.b.c] # this is best practice
[ d.e.f ] # same as [d.e.f]
[ j . "ʞ" . 'l' ] # same as [j."ʞ".'l']
# You don't need to specify all the super-tables if you don't want to. TOML knows
# how to do it for you.
# [x] you
# [x.y] don't
# [x.y.z] need these
[x.y.z.w] # for this to work
# As long as a super-table hasn't been directly defined and hasn't defined a
# specific key, you may still write to it.
[a.b]
c = 1
[a]
d = 2
# You cannot define any key or table more than once. Doing so is invalid.
# DO NOT DO THIS
[a]
b = 1
[a]
c = 2
# DO NOT DO THIS EITHER
[a]
b = 1
[a.b]
c = 2
# All table names must be non-empty.
[] # INVALID
[a.] # INVALID
[a..b] # INVALID
[.b] # INVALID
[.] # INVALID
################
# Inline table #
################
inlineTables = { areEnclosedWith = "{ and }", mustBeInline = true }
point = { x = 1, y = 2 }
###################
# Array of Tables #
###################
# An array of tables can be expressed by using a table name in double brackets.
# Each table with the same double bracketed name will be an item in the array.
# The tables are inserted in the order encountered.
[[products]]
name = "array of table"
sku = 738594937
emptyTableAreAllowed = true
[[products]]
[[products]]
name = "Nail"
sku = 284758393
color = "gray"
# You can create nested arrays of tables as well. Each double-bracketed
# sub-table will belong to the nearest table element above it.
[[fruit]]
name = "apple"
[fruit.Geometry]
shape = "round"
note = "I am an fruit's property"
[[fruit.color]]
name = "red"
note = "I am an array's item in apple"
[[fruit.color]]
name = "green"
note = "I am in the same array than red"
[[fruit]]
name = "banana"
[[fruit.color]]
name = "yellow"
note = "I am an array's item too but banana's one"
```
In JSON land, this code will be:
```json
{
"fruit": [
{
"name": "apple",
"geometry": { "shape": "round", "note": "..."},
"color": [
{ "name": "red", "note": "..." },
{ "name": "green", "note": "..." }
]
},
{
"name": "banana",
"color": [
{ "name": "yellow", "note": "..." }
]
}
]
}
```
### More Resources
+ [TOML official repository](https://github.com/toml-lang/toml)