static KMETHOD Statement_for(KonohaContext *kctx, KonohaStack *sfp)
{
VAR_Statement(stmt, gma);
DBG_P("for statement .. ");
int isOkay = false;
if(SUGAR kStmt_TypeCheckByName(kctx, stmt, KW_ExprPattern, gma, CT_INFER, 0)) {
kNameSpace *ns = Stmt_ns(stmt);
kToken *TypeToken = SUGAR kStmt_GetToken(kctx, stmt, KW_TypePattern, NULL);
kToken *VariableToken = SUGAR kStmt_GetToken(kctx, stmt, KW_SymbolPattern, NULL);
DBG_P("typeToken=%p, varToken=%p", TypeToken, VariableToken);
kExpr *IteratorExpr = SUGAR kStmt_GetExpr(kctx, stmt, KW_ExprPattern, NULL);
if(!TY_isIterator(IteratorExpr->attrTypeId)) {
kMethod *mtd = KLIB kNameSpace_GetMethodByParamSizeNULL(kctx, ns, CT_(IteratorExpr->attrTypeId), MN_to(TY_Iterator), 0, MethodMatch_NoOption);
if(mtd == NULL) {
kStmtExpr_Message(kctx, stmt, IteratorExpr, ErrTag, "expected Iterator expression after in");
KReturnUnboxValue(false);
}
IteratorExpr = SUGAR new_TypedCallExpr(kctx, stmt, gma, CT_INFER, mtd, 1, IteratorExpr);
kStmt_setObject(kctx, stmt, KW_ExprPattern, IteratorExpr);
}
kBlock *block = new_MacroBlock(kctx, stmt, new_TypeToken(kctx, ns, CT_(IteratorExpr->attrTypeId)), new_ParsedExprToken(kctx, ns, IteratorExpr), TypeToken, VariableToken);
kStmt *IfStmt = block->StmtList->StmtItems[1]; // @see macro;
kStmt_appendBlock(kctx, IfStmt, SUGAR kStmt_GetBlock(kctx, stmt, ns, KW_BlockPattern, NULL));
kStmt_Set(CatchBreak, IfStmt, true);
kStmt_Set(CatchContinue, IfStmt, true);
isOkay = SUGAR kBlock_TypeCheckAll(kctx, block, gma);
if(isOkay) {
kStmt_typed(IfStmt, LOOP);
kStmt_setObject(kctx, stmt, KW_BlockPattern, block);
kStmt_typed(stmt, BLOCK);
}
}
KReturnUnboxValue(isOkay);
}
static KMETHOD TypeCheck_to(KonohaContext *kctx, KonohaStack *sfp)
{
VAR_TypeCheck(stmt, expr, gma, reqty);
kExpr *targetExpr = SUGAR kStmt_TypeCheckExprAt(kctx, stmt, expr, 2, gma, TY_var, 0);
kExpr *selfExpr = SUGAR kStmt_TypeCheckExprAt(kctx, stmt, expr, 1, gma, targetExpr->ty, TypeCheckPolicy_NOCHECK);
if(selfExpr != K_NULLEXPR && targetExpr != K_NULLEXPR) {
KonohaClass *selfClass = CT_(selfExpr->ty), *targetClass = CT_(targetExpr->ty);
if(selfExpr->ty == targetExpr->ty || selfClass->isSubType(kctx, selfClass, targetClass)) {
kStmtExpr_Message(kctx, stmt, selfExpr, InfoTag, "no need: %s to %s", TY_t(selfExpr->ty), TY_t(targetExpr->ty));
KReturn(selfExpr);
}
kNameSpace *ns = Stmt_ns(stmt);
kMethod *mtd = KLIB kNameSpace_GetCoercionMethodNULL(kctx, ns, selfExpr->ty, targetExpr->ty);
if(mtd == NULL) {
mtd = KLIB kNameSpace_GetMethodByParamSizeNULL(kctx, ns, selfExpr->ty, MN_("to"), 0);
DBG_ASSERT(mtd != NULL); // because Object.to is found.
if(mtd->typeId != selfExpr->ty) {
KReturn(kStmtExpr_Message(kctx, stmt, selfExpr, ErrTag, "undefined coercion: %s to %s", TY_t(selfExpr->ty), TY_t(targetExpr->ty)));
}
}
KReturn(SUGAR kStmtkExpr_TypeCheckCallParam(kctx, stmt, expr, mtd, gma, targetClass->typeId));
}
}
static KMETHOD TypeCheck_as(KonohaContext *kctx, KonohaStack *sfp)
{
VAR_TypeCheck(stmt, expr, gma, reqty);
kExpr *targetExpr = SUGAR kStmt_TypeCheckExprAt(kctx, stmt, expr, 2, gma, TY_var, 0);
kExpr *selfExpr = SUGAR kStmt_TypeCheckExprAt(kctx, stmt, expr, 1, gma, targetExpr->ty, TypeCheckPolicy_NOCHECK);
if(selfExpr != K_NULLEXPR && targetExpr != K_NULLEXPR) {
KonohaClass *selfClass = CT_(selfExpr->ty), *targetClass = CT_(targetExpr->ty);
if(selfExpr->ty == targetExpr->ty || selfClass->isSubType(kctx, selfClass, targetClass)) {
KReturn(selfExpr);
}
if(selfClass->isSubType(kctx, targetClass, selfClass)) {
kNameSpace *ns = Stmt_ns(stmt);
kMethod *mtd = KLIB kNameSpace_GetMethodByParamSizeNULL(kctx, ns, TY_Object, MN_("as"), 0);
DBG_ASSERT(mtd != NULL);
KReturn(SUGAR kStmtkExpr_TypeCheckCallParam(kctx, stmt, expr, mtd, gma, targetClass->typeId));
}
KReturn(kStmtExpr_Message(kctx, stmt, selfExpr, ErrTag, "unable to downcast: %s as %s", TY_t(selfExpr->ty), TY_t(targetExpr->ty)));
}
}