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// See LICENSE for license details.
package Chisel
import internal._
import internal.Builder.pushCommand
import firrtl._
object when { // scalastyle:ignore object.name
/** Create a `when` condition block, where whether a block of logic is
* executed or not depends on the conditional.
*
* @param cond condition to execute upon
* @param block logic that runs only if `cond` is true
*
* @example
* {{{
* when ( myData === UInt(3) ) {
* // Some logic to run when myData equals 3.
* } .elsewhen ( myData === UInt(1) ) {
* // Some logic to run when myData equals 1.
* } .otherwise {
* // Some logic to run when myData is neither 3 nor 1.
* }
* }}}
*/
def apply(cond: => Bool)(block: => Unit): WhenContext = {
new WhenContext(cond)(block)
}
}
class WhenContext(cond: => Bool)(block: => Unit) {
/** This block of logic gets executed if above conditions have been false
* and this condition is true.
*/
def elsewhen (cond: => Bool)(block: => Unit): WhenContext =
doOtherwise(when(cond)(block))
/** This block of logic gets executed only if the above conditions were all
* false. No additional logic blocks may be appended past the `otherwise`.
*/
def otherwise(block: => Unit): Unit =
doOtherwise(block)
pushCommand(WhenBegin(cond.ref))
block
pushCommand(WhenEnd())
private def doOtherwise[T](block: => T): T = {
pushCommand(WhenElse())
val res = block
pushCommand(WhenEnd())
res
}
}
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