--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/search_expression_type.hh	Mon Jun 01 21:08:44 2009 +0200
@@ -0,0 +1,126 @@
+/*
+ * (c) 2003 Mario de Sousa
+ *
+ * Offered to the public under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+/*
+ * An IEC 61131-3 IL and ST compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+/* Determine the data type of an ST expression.
+ * A reference to the relevant type definition is returned.
+ *
+ * For example:
+ *       2 + 3       -> returns reference to a int_type_name_c object.
+ *       22.2 - 5    -> returns reference to a real_type_name_c object.
+ *       etc...
+ */
+
+class search_expression_type_c: public search_constant_type_c {
+
+  private:
+    search_varfb_instance_type_c *search_varfb_instance_type;
+    search_base_type_c search_base_type;
+
+
+  public:
+    search_expression_type_c(symbol_c *search_scope);
+    virtual ~search_expression_type_c(void);
+
+    /* A helper function... */
+    bool is_bool_type(symbol_c *type_symbol);
+    bool is_time_type(symbol_c *type_symbol);
+    bool is_string_type(symbol_c *type_symbol);
+    bool is_integer_type(symbol_c *type_symbol);
+    bool is_real_type(symbol_c *type_symbol);
+    bool is_num_type(symbol_c *type_symbol);
+    bool is_nbinary_type(symbol_c *type_symbol);
+    bool is_binary_type(symbol_c *type_symbol);
+
+    bool is_same_type(symbol_c *first_type, symbol_c *second_type);
+    symbol_c* common_type(symbol_c *first_type, symbol_c *second_type);
+
+    /*
+    #include "search_type_code.c"
+    */
+    void *compute_standard_function_default(function_invocation_c *st_symbol, il_formal_funct_call_c *il_symbol);
+    /*
+    void *compute_standard_function_default(function_invocation_c *st_symbol = NULL, il_formal_funct_call_c *il_symbol = NULL);
+    */
+    void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_data_type);
+
+
+
+    /*static bool_type_name_c bool_type_name;*/
+
+    /* A helper function... */
+    void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type);
+
+    /* A helper function... */
+    void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type);
+
+    /* a helper function... */
+    symbol_c *base_type(symbol_c *symbol);
+
+    /*********************/
+    /* B 1.4 - Variables */
+    /*********************/
+    
+    void *visit(symbolic_variable_c *symbol);
+
+    /********************************************/
+    /* B 1.4.1 - Directly Represented Variables */
+    /********************************************/
+    void *visit(direct_variable_c *symbol);
+
+    /*************************************/
+    /* B 1.4.2 - Multi-element variables */
+    /*************************************/
+ 
+    void *visit(array_variable_c *symbol);
+    void *visit(structured_variable_c *symbol);
+
+    /***************************************/
+    /* B.3 - Language ST (Structured Text) */
+    /***************************************/
+    /***********************/
+    /* B 3.1 - Expressions */
+    /***********************/
+    void *visit(or_expression_c *symbol);
+    void *visit(xor_expression_c *symbol);
+    void *visit(and_expression_c *symbol);
+    void *visit(equ_expression_c *symbol);
+    void *visit(notequ_expression_c *symbol);
+    void *visit(lt_expression_c *symbol);
+    void *visit(gt_expression_c *symbol);
+    void *visit(le_expression_c *symbol);
+    void *visit(ge_expression_c *symbol);
+    
+    void *visit(add_expression_c *symbol);
+    void *visit(sub_expression_c *symbol);
+    void *visit(mul_expression_c *symbol);
+    void *visit(div_expression_c *symbol);
+    void *visit(mod_expression_c *symbol);
+    void *visit(power_expression_c *symbol);
+    void *visit(neg_expression_c *symbol);
+    void *visit(not_expression_c *symbol);
+    void *visit(function_invocation_c *symbol);
+}; // search_expression_type_c
+
+/*bool_type_name_c     search_expression_type_c::bool_type_name;*/
+