YCode.h

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/*-----------------------------------------------------------*- c++ -*-\
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|                      \ \ / /_ _/ ___|_   _|___ \                     |
|                       \ V / _` \___ \ | |   __) |                    |
|                        | | (_| |___) || |  / __/                     |
|                        |_|\__,_|____/ |_| |_____|                    |
|                                                                      |
|                               core system                            |
|                                                        (C) SuSE GmbH |
\----------------------------------------------------------------------/

   File:        YCode.h

   Author:      Klaus Kaempf <kkaempf@suse.de>
   Maintainer:  Klaus Kaempf <kkaempf@suse.de>

/-*/
// -*- c++ -*-

#ifndef YCode_h
#define YCode_h

#include <string>
using std::string;

// MemUsage.h defines/undefines D_MEMUSAGE
#include <y2util/MemUsage.h>
#include "ycp/YCodePtr.h"

#include "ycp/YCPValue.h"
#include "ycp/YCPString.h"
#include "ycp/Type.h"
#include "ycp/YSymbolEntry.h"

struct ycodelist {
    struct ycodelist *next;
    YCodePtr code;
    constTypePtr type;
};
typedef struct ycodelist ycodelist_t;

class YCode : public Rep
#ifdef D_MEMUSAGE
  , public MemUsage
#endif
{
    REP_BODY(YCode);
public:
    enum ykind {
        yxError = 0,
        // [1] Constants        (-> YCPValue, except(!) term -> yeLocale)
        ycVoid, ycBoolean, ycInteger, ycFloat,  // constants
        ycString, ycByteblock, ycPath, ycSymbol,
        ycList,                                 // list
        ycMap,                                  // map
        ycTerm,                                 // term

        ycEntry,

        ycConstant,             // -- placeholder --
        ycLocale,                               // locale constant (gettext)
        ycFunction,                             // a function definition (parameters and body)

        // [16] Expressions     (-> declaration_t + values)
        yePropagate,            // type propagation (value, type)
        yeUnary,                // unary (prefix) operator
        yeBinary,               // binary (infix) operator
        yeTriple,               // <exp> ? <exp> : <exp>
        yeCompare,              // compare

        // [21] Value expressions (-> values + internal)
        yeLocale,               // locale expression (ngettext)
        yeList,                 // list expression
        yeMap,                  // map expression
        yeTerm,                 // <name> ( ...)
        yeIs,                   // is()
        yeBracket,              // <name> [ <expr>, ... ] : <expr>

        // [27] Block (-> linked list of statements)
        yeBlock,                // block expression
        yeReturn,               // quoted expression, e.g. "``(<exp>)" which really is "{ return <exp>; }"

        // [29] Symbolref (-> SymbolEntry)
        yeVariable,             // variable ref
        yeBuiltin,              // builtin ref + args
        yeFunction,             // function ref + args
        yeReference,            // reference to a variable (identical to yeVariable but with different semantics)
        // SuSE Linux v9.2
        yeFunctionPointer,      // function pointer

        yeExpression,           // -- placeholder --

        // [35] Statements      (-> YCode + next)
        ysTypedef,              // typedef
        ysVariable,             // variable defintion (-> YSAssign)
        ysFunction,             // function definition
        ysAssign,               // variable assignment (-> YSAssign)
        ysBracket,              // <name> [ <expr>, ... ] = <expr>
        ysIf,                   // if, then, else
        ysWhile,                // while () do ...
        ysDo,                   // do ... while ()
        ysRepeat,               // repeat ... until ()
        ysExpression,           //  any expression (function call)
        ysReturn,               // return
        ysBreak,                // break
        ysContinue,             // continue
        ysTextdomain,           // textdomain
        ysInclude,              // include
        ysFilename,             //  restore filename after include
        ysImport,               // import
        ysBlock,                // a block as statement
        ysSwitch,               // switch (since 10.0)
        ysStatement             // [54] -- placeholder --
    };

public:

    YCode ();

    virtual ~YCode();

    virtual ykind kind() const = 0;
   
    virtual string toString() const;
    static string toString(ykind kind);

    virtual std::ostream & toStream (std::ostream & str) const = 0;

    virtual bool isConstant () const;

    bool isError () const;

    virtual bool isStatement () const;

    virtual bool isBlock () const;

    virtual bool isReferenceable () const;

    virtual YCPValue evaluate (bool cse = false);

  virtual constTypePtr type() const;
};


class YConst : public YCode
{
    REP_BODY(YConst);
    ykind m_kind;
    YCPValue m_value;           // constant (not allowed in union :-( )
public:
    YConst (ykind kind, YCPValue value);                // Constant
    YConst (ykind kind, bytecodeistream & str);
    ~YConst () {};
    YCPValue value() const;
    virtual ykind kind() const;
    string toString() const;
    std::ostream & toStream (std::ostream & str) const;
    virtual bool isConstant () const { return true; }
    YCPValue evaluate (bool cse = false);
    constTypePtr type() const;
};

#include <ext/hash_map>
#include <string>
#include <cstddef>

class YELocale;

class YLocale : public YCode
{
    REP_BODY(YLocale);
    const char *m_locale;               // the string to be translated

    struct eqstr
    {
        bool operator()(const char* s1, const char* s2) const
        {
            return strcmp(s1, s2) == 0;
        }
    };

public:
    typedef __gnu_cxx::hash_map<const char*, bool, __gnu_cxx::hash<const char*>, eqstr> t_uniquedomains;

    static t_uniquedomains domains;     // keep every textdomain only once
    static t_uniquedomains::const_iterator setDomainStatus (const string& domain, bool status);
    static void ensureBindDomain (const string& domain);

    YLocale (const char *locale, const char *textdomain);
    YLocale (bytecodeistream & str);
    ~YLocale ();
    virtual ykind kind () const { return ycLocale; }
    const char *value () const;
    const char *domain () const;
    string toString() const;
    std::ostream & toStream (std::ostream & str) const;
    YCPValue evaluate (bool cse = false);
    constTypePtr type() const { return Type::Locale; }
    
private:

    t_uniquedomains::const_iterator m_domain;

};

class YFunction : public YCode
{
    REP_BODY(YFunction);
    // array of formal arguments of a function
    // the formal parameters must be available in the local scope during parse
    // of the function body (startDefinition()) and removed afterwards (endDefintion()).
    // Keep track of the table entries in this block.
    //
    // When calling a function during execution, the actual
    // arguments (values) are bound to the formal arguments
    // (this array) so the function body can be evaluated.
    // @see YEFunction::attachActualParameter()
    //
    // if NULL, it's a (void) function
    YBlockPtr m_declaration;

    // the function definition ('body') is the block defining this function
    YBlockPtr m_definition;

    bool m_is_global;

public:
    YFunction (YBlockPtr parameterblock, const SymbolEntryPtr entry = 0);
    YFunction (bytecodeistream & str);
    ~YFunction ();
    virtual ykind kind () const { return ycFunction; }

    // access to formal parameters
    unsigned int parameterCount () const;
    YBlockPtr declaration () const;
    SymbolEntryPtr parameter (unsigned int position) const;

    // access to definition block (= 0 if declaration only)
    YBlockPtr definition () const;
    void setDefinition (YBlockPtr body);
    // read definition from stream
    void setDefinition (bytecodeistream & str);

    string toStringDeclaration () const;
    string toString () const;
    std::ostream & toStreamDefinition (std::ostream & str) const;
    std::ostream & toStream (std::ostream & str) const;
    virtual YCPValue evaluate (bool cse = false);
    constTypePtr type() const;
};


#endif   // YCode_h

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