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onFieldAccess
package metaobjectTest
@doc{*
Annotations of this metaobject are attached to a field.
The attached DSL code is made in Myan, which supports interpreted Cyan
within parameterless methods declared with 'func':
func afti_codeToAdd {
// interpreted Cyan code
}
According to the method name, the Cyan code is interpreted in phase
afti or dsa. Methods of interfaces
IAction_dsa
IActionNewPrototypes_dsa
IAction_afti
IActionNewPrototypes_afti
IParseWithCyanCompiler_dpa
ICommunicateInPrototype_afti_dsa_afsa
IActionFieldAccess_dsa
can be implemented. To better understand this, see the documentation
for action_afti_dsa.
*}
object OnFieldAccess
func run {
alwaysZero = 10;
var value = alwaysZero;
assert value == 0;
assert howManyTimesCounterWasSet == 0;
counter = 1;
assert howManyTimesCounterWasSet == 1;
}
/* Each time the variable is set, field
howManyTimesCounterWasSet is incremented by 1.
*/
@onFieldAccess{*
func dsa_replaceSetField {
var String name = fieldToSet asString;
var String value = rightHandSideAssignment asString;
return name ++ " = " ++ value ++ """; ++howManyTimesCounterWasSet;""";
}
*}
var Int counter = 0;
var Int howManyTimesCounterWasSet = 0;
/* Even if this field is set to another value,
its value will always be 0
*/
@onFieldAccess{*
func dsa_replaceGetField {
return "0";
}
*}
var Int alwaysZero = 9;
end
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