idlc/inc/astexpression.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19 #ifndef INCLUDED_IDLC_INC_ASTEXPRESSION_HXX
  20 #define INCLUDED_IDLC_INC_ASTEXPRESSION_HXX
  21
  22 #include <sal/config.h>
  23
  24 #include <memory>
  25
  26 #include "idlc.hxx"
  27 #include <boost/optional.hpp>
  28
  29 // Enum to define all the different operators to combine expressions
  30 enum class ExprComb
  31 {
  32     Add,     // '+'
  33     Minus,   // '-'
  34     Mul,     // '*'
  35     Div,     // '/'
  36     Mod,     // '%'
  37     Or,      // '|'
  38     Xor,     // '^'
  39     And,     // '&'
  40     Left,    // '<<'
  41     Right,   // '>>'
  42     UPlus,   // unary '+'
  43     UMinus,  // unary '-'
  44     NONE,    // No operator (missing)
  45     Symbol   // a symbol (function or constant name)
  46 };
  47
  48 // Enum to define expression type
  49 enum ExprType
  50 {
  51     ET_short,       // Expression value is short
  52     ET_ushort,      // Expression value is unsigned short
  53     ET_long,        // Expression value is long
  54     ET_ulong,       // Expression value is unsigned long
  55     ET_hyper,       // Expression value is hyper (64 bit)
  56     ET_uhyper,      // Expression value is unsigned hyper
  57     ET_float,       // Expression value is 32-bit float
  58     ET_double,      // Expression value is 64-bit float
  59     ET_char,        // Expression value is char
  60     ET_byte,        // Expression value is byte
  61     ET_boolean,     // Expression value is boolean
  62     ET_string,      // Expression value is char *
  63     ET_any,         // Expression value is any of above
  64     ET_void,        // Expression value is void (absent)
  65     ET_type,        // Expression value is type
  66     ET_none         // Expression value is missing
  67 };
  68
  69 // Structure to describe value of constant expression and its type
  70 struct AstExprValue
  71 {
  72     union
  73     {
  74         sal_uInt8       byval;      // Contains byte expression value
  75         sal_Int16       sval;       // Contains short expression value
  76         sal_uInt16      usval;      // Contains unsigned short expr value
  77         sal_Int32       lval;       // Contains long expression value
  78         sal_uInt32      ulval;      // Contains unsigned long expr value
  79         sal_Int64       hval;       // Contains hyper expression value
  80         sal_uInt64      uhval;      // Contains unsigned hyper expr value
  81         bool            bval;       // Contains boolean expression value
  82         float           fval;       // Contains 32-bit float expr value
  83         double          dval;       // Contains 64-bit float expr value
  84     } u;
  85     ExprType et;
  86 };
  87
  88 const sal_Char* exprTypeToString(ExprType t);
  89
  90 class AstExpression final
  91 {
  92 public:
  93     // Constructor(s)
  94     AstExpression(ExprComb c, AstExpression *pExpr1, AstExpression *pExpr2);
  95
  96     AstExpression(sal_Int32         l);
  97     AstExpression(sal_Int32         l, ExprType et);
  98     AstExpression(sal_Int64         h);
  99     AstExpression(sal_uInt64        uh);
 100     AstExpression(double            d);
 101     AstExpression(OString* scopedName);
 102
 103     ~AstExpression();
 104
 105     // Data Accessors
 106     AstExprValue* getExprValue()
 107         { return m_exprValue.get(); }
 108
 109     // Evaluation and value coercion
 110     bool coerce(ExprType type);
 111
 112     // Evaluate then store value inside this AstExpression
 113     void evaluate();
 114
 115     // Compare LONG AstExpression values
 116     bool compareLong(AstExpression *pExpr);
 117
 118     OString toString();
 119 private:
 120     // Evaluate different sets of operators
 121     std::unique_ptr<AstExprValue> eval_bin_op();
 122     std::unique_ptr<AstExprValue> eval_bit_op();
 123     std::unique_ptr<AstExprValue> eval_un_op();
 124     std::unique_ptr<AstExprValue> eval_symbol();
 125
 126     ExprComb        m_combOperator;
 127     std::unique_ptr<AstExpression>
 128                     m_subExpr1;
 129     std::unique_ptr<AstExpression>
 130                     m_subExpr2;
 131     std::unique_ptr<AstExprValue>
 132                     m_exprValue;
 133     boost::optional<OString>
 134                     m_xSymbolicName;
 135 };
 136
 137 #endif // INCLUDED_IDLC_INC_ASTEXPRESSION_HXX
 138
 139 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */