author | Mario de Sousa <msousa@fe.up.pt> |
Tue, 13 Mar 2012 16:38:21 +0000 | |
changeset 478 | b13feab3b918 |
parent 377 | 60b012b7793f |
child 661 | f537c3315f83 |
permissions | -rwxr-xr-x |
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/* |
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* matiec - a compiler for the programming languages defined in IEC 61131-3 |
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* |
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* Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt) |
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* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* |
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* This code is made available on the understanding that it will not be |
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* used in safety-critical situations without a full and competent review. |
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*/ |
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/* |
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* An IEC 61131-3 compiler. |
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* |
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* Based on the |
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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* |
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*/ |
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/* |
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* Case element iterator. |
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* Iterate through the elements of a case list. |
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* |
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* This is part of the 4th stage that generates |
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* a c++ source program equivalent to the IL and ST |
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* code. |
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*/ |
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/* Given a case_list_c and a type of element, iterate through |
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* each element, returning the symbol of each element if from |
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* the good type...case_element_iterator_c |
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*/ |
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#include "../absyntax/visitor.hh" |
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class case_element_iterator_c : public null_visitor_c { |
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public: |
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/* A type to specify the type of element. |
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*/ |
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typedef enum { |
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element_single, |
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element_subrange, |
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} case_element_t ; |
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private: |
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/* a pointer to the case_list_c currently being analyzed */ |
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symbol_c *case_list; |
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/* used when called to iterate() for a parameter */ |
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symbol_c *current_case_element; |
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/* used to indicate the type of case element on which iterate */ |
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case_element_t wanted_element_type; |
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private: |
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void* handle_case_element(symbol_c *case_element); |
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void* iterate_list(list_c *list); |
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public: |
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/* start off at the first case element once again... */ |
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void reset(void); |
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/* initialize the iterator object. |
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* We must be given a reference to a case_list_c that will be analyzed... |
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*/ |
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case_element_iterator_c(symbol_c *list, case_element_t element_type); |
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/* Skip to the next case element of type chosen. After object creation, |
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* the object references on case element _before_ the first, so |
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* this function must be called once to get the object to |
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* reference the first element... |
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* |
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* Returns the case element's symbol! |
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*/ |
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symbol_c *next(void); |
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private: |
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/******************************/ |
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/* B 1.2.1 - Numeric Literals */ |
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/******************************/ |
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void *visit(integer_c *symbol); |
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void *visit(neg_integer_c *symbol); |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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/* signed_integer DOTDOT signed_integer */ |
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void *visit(subrange_c *symbol); |
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/* enumerated_type_name '#' identifier */ |
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void *visit(enumerated_value_c *symbol); |
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/********************************/ |
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/* B 3.2.3 Selection Statements */ |
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/********************************/ |
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void *visit(case_list_c *symbol); |
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}; // function_param_iterator_c |
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