com.yandex.div.evaluable.function.ToInteger.kt Maven / Gradle / Ivy

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DivKit is an open source Server-Driven UI (SDUI) framework. SDUI is a an emerging technique that leverage the server to build the user interfaces of their mobile app.

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package com.yandex.div.evaluable.function

import com.yandex.div.evaluable.EvaluableType
import com.yandex.div.evaluable.EvaluationContext
import com.yandex.div.evaluable.ExpressionContext
import com.yandex.div.evaluable.Function
import com.yandex.div.evaluable.FunctionArgument
import com.yandex.div.evaluable.REASON_CONVERT_TO_INTEGER
import com.yandex.div.evaluable.throwExceptionOnFunctionEvaluationFailed

private const val FUNCTION_NAME = "toInteger"
private const val NUMBER_MIN_INTEGER = Long.MIN_VALUE.toDouble()
private const val NUMBER_MAX_INTEGER = Long.MAX_VALUE.toDouble()

internal object NumberToInteger : Function() {

    override val name = FUNCTION_NAME

    override val declaredArgs = listOf(FunctionArgument(type = EvaluableType.NUMBER))

    override val resultType = EvaluableType.INTEGER

    override val isPure = true

    override fun evaluate(
        evaluationContext: EvaluationContext,
        expressionContext: ExpressionContext,
        args: List
    ): Any {
        val numberValue = args.first() as Double
        if (numberValue < NUMBER_MIN_INTEGER || numberValue > NUMBER_MAX_INTEGER) {
            throwExceptionOnFunctionEvaluationFailed(name, args, REASON_CONVERT_TO_INTEGER)
        }
        return numberValue.toLong()
    }
}

internal object BooleanToInteger : Function() {

    override val name = "toInteger"

    override val declaredArgs = listOf(FunctionArgument(type = EvaluableType.BOOLEAN))

    override val resultType = EvaluableType.INTEGER

    override val isPure = true

    override fun evaluate(
        evaluationContext: EvaluationContext,
        expressionContext: ExpressionContext,
        args: List
    ): Any {
        val booleanValue = args.first() as Boolean
        return if (booleanValue) 1L else 0L
    }
}

internal object StringToInteger : Function() {

    override val name = FUNCTION_NAME

    override val declaredArgs = listOf(FunctionArgument(type = EvaluableType.STRING))

    override val resultType = EvaluableType.INTEGER

    override val isPure = true

    override fun evaluate(
        evaluationContext: EvaluationContext,
        expressionContext: ExpressionContext,
        args: List
    ): Any {
        val stringValue = args.first() as String
        return try {
            stringValue.toLong()
        } catch (nfe: NumberFormatException) {
            throwExceptionOnFunctionEvaluationFailed(name, args, REASON_CONVERT_TO_INTEGER, nfe)
        }
    }
}