.. _stdlib_ast_block_to_loop:

=======================
DECS、AST 块到循环
=======================

.. include:: detail/ast_block_to_loop.rst

ast_block_to_loop 模块将块到循环转换作为 DECS 基础设施的一部分实现。

所有函数和符号都在 “ast_block_to_loop” 模块中，使用 require 来访问它。 ::

    require daslib/ast_block_to_loop

++++++++++++++++++++++++
块到循环转换
++++++++++++++++++++++++

  *  :ref:`convert_block_to_loop (blk:smart_ptr\<ast::Expression\> -const;failOnReturn:bool const;replaceReturnWithContinue:bool const;requireContinueCond:bool const) : void <function-_at_ast_block_to_loop_c__c_convert_block_to_loop_1_ls_H_ls_ast_c__c_Expression_gr__gr__qm_M_Cb_Cb_Cb>` 

.. _function-_at_ast_block_to_loop_c__c_convert_block_to_loop_1_ls_H_ls_ast_c__c_Expression_gr__gr__qm_M_Cb_Cb_Cb:

.. das:function:: convert_block_to_loop(blk: smart_ptr<Expression>; failOnReturn: bool const; replaceReturnWithContinue: bool const; requireContinueCond: bool const)

+-------------------------+-----------------------------------------------------------+
+argument                 +argument type                                              +
+=========================+===========================================================+
+blk                      +smart_ptr< :ref:`ast::Expression <handle-ast-Expression>` >+
+-------------------------+-----------------------------------------------------------+
+failOnReturn             +bool const                                                 +
+-------------------------+-----------------------------------------------------------+
+replaceReturnWithContinue+bool const                                                 +
+-------------------------+-----------------------------------------------------------+
+requireContinueCond      +bool const                                                 +
+-------------------------+-----------------------------------------------------------+


将 Closure Block 转换为 loop。
如果 `failOnReturn` 为 true，则不允许在块内返回。
如果 `replaceReturnWithContinue` 为 true，则 `return cond;` 替换为 `if cond; continue;`。
如果 `requireContinueCond` 为 false，则 `return;` 替换为 `continue;`，否则为错误。