transform method

MixinDefinition transform(List<List<Expression>> callArgs)

Given a mixin's defined arguments return a cloned mixin definition that has replaced all defined arguments with user's supplied VarUsages.

Implementation

MixinDefinition transform(List<List<Expression>> callArgs) {
  // TODO(terry): Handle default arguments and varArgs.
  // Transform mixin with callArgs.
  for (var index = 0; index < _definedArgs!.length; index++) {
    var definedArg = _definedArgs![index];
    VarDefinition? varDef;
    if (definedArg is VarDefinition) {
      varDef = definedArg;
    } else if (definedArg is VarDefinitionDirective) {
      var varDirective = definedArg;
      varDef = varDirective.def;
    }
    var callArg = callArgs[index];

    // Is callArg a var definition with multi-args (expressions > 1).
    var defArgs = _varDefsAsCallArgs(callArg);
    if (defArgs.isNotEmpty) {
      // Replace call args with the var def parameters.
      callArgs.insertAll(index, defArgs);
      callArgs.removeAt(index + defArgs.length);
      callArg = callArgs[index];
    }

    var expressions = varUsages[varDef!.definedName];
    expressions!.forEach((k, v) {
      for (var usagesIndex in v) {
        k.expressions.replaceRange(usagesIndex, usagesIndex + 1, callArg);
      }
    });
  }

  // Clone the mixin
  return mixinDef.clone();
}