Interpolator class

Class to parse and cache string template for later interpolation

Initialization with a string template:

const format = "substitution: {sub}; escaping braces: {pre}{suf} placeholder:{unmatched}";
final interpolator = Interpolator(format, {null: "null"});
print(interpolator({"sub": "substituted"}));

//substitution: substituted; escaping braces: {} placeholder:null

Constructors

Interpolator(String format, [Map<String?, dynamic> defaultVal = const {}])

Create an Interpolator with format and an optional map defaultVal to set the default values of keys. Set the value of key null in the defaultVal to designate a placeholder to substitute the keys in the string template which do not exist in the provided map, otherwise a FormatException will be thrown when fail to find a key in the map.

factory

Interpolator.noEscape(String format, [Map<String?, dynamic> defaultVal = const {}])

All the same to the Interpolator constructor except this one crates an interpolator which does not escape the braces.

factory

Properties

format → dynamic

The input string template

no setter

hashCode → int

The hash code for this object.

no setter, inherited

keys → dynamic

Interpolation keys of string template

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

call<V>(Map<String?, V> subs) → String

Perform interpolation on early parsed string template with subs

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

retrieve(String input) → Map<String, String>

Retrieve values from an interpolated string input Use with care since values may contain the same patterns that divide values

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited