div_expressions_resolver

Description:

div expressions resolver

div_expressions_resolver #

DivKit expressions resolver plugin for Flutter client.
Overview #
This library provides a wrapper around native implementation of ExpressionResolver for iOS and Evaluator for Android.
Features #
The calculated part of the expression is written using the @{} construction and may contain variables, operators, and functions.
Calculated expressions support the following constructions:

Logical operators: ==, !=, !, >, >=, <, =, &&, ||.
Arithmetic operators: +, -, *, /, %.
Ternary operator: counter > 0 ? true : false.
Grouping logical expressions: logging_enabled && (user_name == 'John' || user_email != '').
Function calls: mult(total_price, .83)
Using calculated parts within strings and string-type calculated expressions: "mail: @{'@{username}@ya.ru'}" is converted to mail: [email protected]

So fully supports of DivKit specification:

https://divkit.tech/docs/en/concepts/expressions
https://divkit.tech/docs/en/concepts/functions

Usage #
final nativeResolver = NativeDivExpressionsResolver();

// Use simple math
fianl r1 = await nativeResolver.resolve( // Result: 1
"@{0 + 1}",
context: {},
);

// Use variables
fianl r2 = await nativeResolver.resolve( // Result: 2
"@{a + b}",
context: {
"a" : 1,
"b" : 1,
},
);

// Use embedded functions
fianl r3 = await nativeResolver.resolve( // Result: 3
"@{sum(a, b)}",
context: {
"a" : 1,
"b" : 2,
},
);

// Use branching and more!
fianl r3 = await nativeResolver.resolve( // Result: 4
"@{sum(a, b) == 5 ? 4 : 0}",
context: {
"a" : 3,
"b" : 2,
},
);
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