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Informations about the package ausdruck
Ausdruck
A small expression engine for PHP.
Quick start
Documentation
Accessing scope variables
Syntax: varName:type
Scope variables are passed from PHP when it calls evaluate() on the expression:
Examples
foo:int, foo:list<string>
See Types
Literals
123: Integer"foo": String1.23: Float[1, myInt:int, 3]: List of integers["foo", myString:string, "bar"]: List of strings
Operators
Both operands must be of the same type.
| Operator | Description | Example | Note |
|---|---|---|---|
=== |
Equality | foo:string === "bar" |
|
- |
Subtraction | foo:int - bar:int |
Operands must be of type int or float |
> |
Greater than | foo:int > bar:int |
Operands must be of type int or float |
\|\| |
Logical OR | foo:bool \|\| bar:bool |
Operands must be of type bool |
| && | Logical AND | foo:bool && bar:bool |
Operands must be of type bool |
Where's the rest? We're implementing more as we need them.
Types
The following types are supported:
int: Integerstring: Stringbool: Booleanfloat: Floating point numberlist<T>: List of type Tmap<K, V>: Map with key type K and value type V- Any other type will be treated as an alias that you will have to provide when parsing the expression:
Functions
Syntax: target.functionName:returnType(arg1, arg2, ...)
The target can be any expression. It will be passed as the first argument to the function.
Example
haystack:list<string>.contains:bool(needle:string)
Built-In Functions
| Function | Description | Example |
|---|---|---|
count |
Returns the number of elements in a list | foo:list<string>.count:int() |
contains |
Returns whether a list contains a value | foo:list<string>.contains:bool("bar") |
head |
Returns the first element of a list as an Option |
foo:list<string>.head:Option<string>() |
isSome |
Takes an Option and returns whether it is Some |
foo:Option<int>.isSome:bool() |
map |
Returns a new list with the results of applying a function | foo:list<int>.map:list<int>(\|i\| i:int - 2) |
some |
Returns whether any element matches a predicate | foo:list<int>.some:bool(\|item\| item:int > 5) |
substr |
Returns a substring of a string | foo:string.substr:string(0, 5) |
tail |
Returns all elements of a list except the first | foo:list<string>.tail:list<string>() |
take |
Returns the first n elements of a list | foo:list<string>.take:list<string>(5) |
unique |
Returns a list with duplicate elements removed | foo:list<string>.unique:list<string>() |
Custom Functions
You can pass custom functions along with the scope variables:
The target of the function/method call (foo:string in the example above) will be passed as the first argument to the
function.
Lambdas
Syntax: |arg1, arg2, ... | expression
To access an argument, you must specify its type, just like when accessing scope variables.
Example
|item| item:int > 5
All versions of ausdruck with dependencies
ext-ctype Version *