Temporary grammar-local variables can be defined and set in grammar actions.
在语法片断中可以定义并设置临时的局部语法(grammar - local)变量。
You must add actions and other supporting code to the defined grammar.
您必须添加动作和其他支持所定义语法的代码。
These actions execute once those portions of the grammar have been successfully traversed.
一旦成功遍历了语法中的那些部分，则执行这些操作。
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