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Étienne Fildadut 2021-12-06 16:33:38 +01:00
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REFERENCE.md
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@ -176,7 +176,10 @@ $ f(x::string)
Every operator, except assignement operators, `|`, `&`, `,`, `~` and `#` can also be use as a function name in order to overload the operator: Every operator, except assignement operators, `|`, `&`, `,`, `~` and `#` can also be use as a function name in order to overload the operator:
``` ```
$ /(a::string, b::string) (binary operator names: _op_)
(prefix unary operator: op_)
(suffix unary operator: _op)
$ _/_(a::string, b::string)
@"{a}/{b}" @"{a}/{b}"
``` ```
@ -523,12 +526,16 @@ Default types are:
* `string`: a string. Can be defined between double quotes `"string"`. Support [text interpolation](#text-interpolation). Support [escape codes](#escape-codes). * `string`: a string. Can be defined between double quotes `"string"`. Support [text interpolation](#text-interpolation). Support [escape codes](#escape-codes).
* `list`: a list of values. Types can be mixed. Can be defined between square brackets and use comma as a separator '[1,2,3,4]'.
* `pair`: a couple of values. Types can be mixed. Can be defined using colon `"key":5`. Pairs named by a string that is also a valid identifier can be created using the `key=5` shorthand syntax. * `pair`: a couple of values. Types can be mixed. Can be defined using colon `"key":5`. Pairs named by a string that is also a valid identifier can be created using the `key=5` shorthand syntax.
* `type`: a couple of values. Types can be mixed. Can be defined using colon `expr::type`. The second value is used in type checks, this is intended to be use to give a custom type to a value. * `type`: a couple of values. Types can be mixed. Can be defined using colon `expr::type`. The second value is used in type checks, this is intended to be use to give a custom type to a value.
* `function reference`: reference to one or more function(s) with a given name. Can be defined using `&function name`, which will create a reference to every function with this name accessible from the current namespace. Can be called as if it was the original function using `func ref!` and `func ref(args)`.
* `list`: a list of values. Mutable. Types can be mixed. Can be defined between square brackets and use comma as a separator '[1,2,3,4]'.
Every type is immutable, except `list`.
How conversions are handled from Anselme to Lua: How conversions are handled from Anselme to Lua:
* `nil` -> `nil` * `nil` -> `nil`
@ -573,13 +580,15 @@ Only `0` and `nil` are false. Everything else is considered true.
#### Function calls #### Function calls
The simplest way to call a function is simply to use its name. If the function has no arguments, parantheses are optional: The simplest way to call a function is simply to use its name. If the function has no arguments, parantheses are optional, or can be replaced with a `!`:
``` ```
$ f $ f
called called
~ f ~ f
(equivalent to)
~ f!
$ f(a) $ f(a)
called with {a} called with {a}
@ -607,18 +616,18 @@ Force no checkpoint, will write "a" and "c":
``` ```
Functions with arguments can also be called with a "method-like" syntax (though Anselme has no concept of classes and methods): Functions with arguments can also be called with a "method-like" syntax using the `!` operator (though Anselme has no concept of classes and methods):
``` ```
$ f(a) $ f(a)
called with {a} called with {a}
"an argument".f "an argument"!f
$ f(a, b) $ f(a, b)
called with {a} and {b} called with {a} and {b}
"an argument".f("another argument") "an argument"!f("another argument")
``` ```
If the function has a return value, any of these calls will of course return the value. If the function has a return value, any of these calls will of course return the value.
@ -721,6 +730,7 @@ Force run the function starting from checkpoint, will write "b" and "c" and set
Will correctly resumes from the last set checkpoint, and write "b" and "c": Will correctly resumes from the last set checkpoint, and write "b" and "c":
~ f ~ f
f! can also be used for the exact same result.
Function can always be restarted from the begining using parantheses: Function can always be restarted from the begining using parantheses:
~ f() ~ f()
@ -757,21 +767,24 @@ Please also be aware that when resuming from a checkpoint, Anselme will try to r
From lowest to highest priority: From lowest to highest priority:
``` ```
; _;_
:= += -= //= /= *= %= ^= _:=_ _+=_ _-=_ _//=_ _/=_ _*=_ _%=_ _^=_
, _,_
| & ~ # _|_ _&_ _~_ _#_
!= == >= <= < > _!=_ _==_ _>=_ _<=_ _<_ _>_
+ - _+_ _-_
* // / % _*_ _//_ _/_ _%_
:: : _::_ _:_
unary -, unary ! -_ !_
^ _^_
. _._ _!_
&_
``` ```
A series of operators with the same priority are evaluated left-to-right. A series of operators with the same priority are evaluated left-to-right.
The function called for a binary operator op is named `_op_`, for a prefix unary operator `op_`, for a suffix unary operator `_op`. Theses names are used to defined new operator behaviour; see function line.
#### Operators #### Operators
Built-in operators: Built-in operators:
@ -820,6 +833,16 @@ This only works on strings:
`a | b`: or operator, lazy `a | b`: or operator, lazy
##### Functions
`fn(args)`: call the function, checkpoint or function reference with the given arguments.
`fn!`: call the function, checkpoint or function reference without arguments. Can leads to different behaviour that the syntax with parantheses; see [function calls](#function-calls).
`&fn`: returns a function reference to the given function.
`a!fn(args)`: call the function or function reference with the variable as first argument. Parantheses are optional.
##### Various ##### Various
`a ; b`: evaluate a, discard its result, then evaluate b. Returns the result of b. `a ; b`: evaluate a, discard its result, then evaluate b. Returns the result of b.
@ -832,6 +855,8 @@ This only works on strings:
`a # b`: evaluates b, then evaluates a whith b added to the active tags. Returns a. `a # b`: evaluates b, then evaluates a whith b added to the active tags. Returns a.
`a.b`: if a is a function reference, returns the variable named `b` in the referenced function namespace. When overloading this operator, if `b` is an identifier, the operator will interpret it as a string (and not returns the evaluated value of the variable eventually associated to the identifier).
`a(b)`: evaluate b (number), returns the value with this index in a (list). Use 1-based indexing. If b is a string, will search the first pair in the list with this string as its name. Operator is named `()`. `a(b)`: evaluate b (number), returns the value with this index in a (list). Use 1-based indexing. If b is a string, will search the first pair in the list with this string as its name. Operator is named `()`.
`{}(v)`: function called when formatting a value in a text interpolation for printing. `{}(v)`: function called when formatting a value in a text interpolation for printing.