kicad/include/libeval_compiler/libeval_compiler.h

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/*
This file is part of libeval, a simple math expression evaluator
Copyright (C) 2007 Michael Geselbracht, mgeselbracht3@gmail.com
Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef __LIBEVAL_COMPILER_H
#define __LIBEVAL_COMPILER_H
#include <cstddef>
#include <functional>
#include <map>
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#include <string>
#include <stack>
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#include <base_units.h>
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#include <wx/intl.h>
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#if defined(WIN32)
// This gets leaked by python headers on MSVC only and will cause chaos
#undef COMPILER
#endif
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#define TR_OP_BINARY_MASK 0x200
#define TR_OP_UNARY_MASK 0x100
#define TR_OP_MUL 0x201
#define TR_OP_DIV 0x202
#define TR_OP_ADD 0x203
#define TR_OP_SUB 0x204
#define TR_OP_LESS 0x25
#define TR_OP_GREATER 0x206
#define TR_OP_LESS_EQUAL 0x207
#define TR_OP_GREATER_EQUAL 0x208
#define TR_OP_EQUAL 0x209
#define TR_OP_NOT_EQUAL 0x20a
#define TR_OP_BOOL_AND 0x20b
#define TR_OP_BOOL_OR 0x20c
#define TR_OP_BOOL_NOT 0x100
#define TR_OP_FUNC_CALL 24
#define TR_OP_METHOD_CALL 25
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#define TR_UOP_PUSH_VAR 1
#define TR_UOP_PUSH_VALUE 2
// This namespace is used for the lemon parser
namespace LIBEVAL
{
class COMPILER;
enum COMPILATION_STAGE
{
CST_PARSE = 0,
CST_CODEGEN,
CST_RUNTIME
};
struct ERROR_STATUS
{
bool pendingError = false;
COMPILATION_STAGE stage;
wxString message;
int srcPos;
};
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enum VAR_TYPE_T
{
VT_STRING = 1,
VT_NUMERIC,
VT_UNDEFINED,
VT_PARSE_ERROR
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};
enum TOKEN_TYPE_T
{
TR_UNDEFINED = 0,
TR_NUMBER = 1,
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TR_IDENTIFIER = 2,
TR_ASSIGN = 3,
TR_STRUCT_REF = 4,
TR_STRING = 5,
TR_UNIT = 6,
TR_ARG_LIST = 7,
TR_NULL = 8
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};
class UOP;
class UCODE;
class CONTEXT;
class VAR_REF;
typedef std::function<void( CONTEXT*, void* )> FUNC_CALL_REF;
struct T_TOKEN_VALUE
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{
wxString* str;
double num;
int idx;
};
// Lemon can't handle c'tors and d'tors, so we provide a poor-man's version.
constexpr T_TOKEN_VALUE defaultTokenValue = { nullptr, 0.0, 0 };
struct T_TOKEN
{
int token;
T_TOKEN_VALUE value;
};
// Lemon can't handle c'tors and d'tors, so we provide a poor-man's version.
constexpr T_TOKEN defaultToken = { TR_UNDEFINED, defaultTokenValue };
class TREE_NODE
{
public:
T_TOKEN_VALUE value;
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int op;
TREE_NODE* leaf[2];
UOP* uop;
bool valid;
bool isTerminal;
bool isVisited;
int srcPos;
void SetUop( int aOp, double aValue );
void SetUop( int aOp, const wxString& aValue, bool aStringIsWildcard );
void SetUop( int aOp, std::unique_ptr<VAR_REF> aRef = nullptr );
void SetUop( int aOp, FUNC_CALL_REF aFunc, std::unique_ptr<VAR_REF> aRef = nullptr );
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};
TREE_NODE* newNode( LIBEVAL::COMPILER* compiler, int op,
const T_TOKEN_VALUE& value = defaultTokenValue );
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class UNIT_RESOLVER
{
public:
UNIT_RESOLVER()
{
}
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virtual ~UNIT_RESOLVER()
{
}
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virtual const std::vector<wxString>& GetSupportedUnits() const
{
static const std::vector<wxString> nullUnits;
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return nullUnits;
}
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virtual wxString GetSupportedUnitsMessage() const
{
return wxEmptyString;
}
virtual double Convert( const wxString& aString, int unitType ) const
{
return 0.0;
};
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};
class VALUE
{
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public:
VALUE() :
m_type( VT_UNDEFINED ),
m_valueDbl( 0 ),
m_stringIsWildcard( false ),
m_isDeferredDbl( false ),
m_isDeferredStr( false )
{};
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VALUE( const wxString& aStr, bool aIsWildcard = false ) :
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m_type( VT_STRING ),
m_valueDbl( 0 ),
m_valueStr( aStr ),
m_stringIsWildcard( aIsWildcard ),
m_isDeferredDbl( false ),
m_isDeferredStr( false )
{};
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VALUE( const double aVal ) :
m_type( VT_NUMERIC ),
m_valueDbl( aVal ),
m_stringIsWildcard( false ),
m_isDeferredDbl( false ),
m_isDeferredStr( false )
{};
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virtual ~VALUE()
{};
virtual double AsDouble() const
{
if( m_isDeferredDbl )
{
m_valueDbl = m_lambdaDbl();
m_isDeferredDbl = false;
}
return m_valueDbl;
}
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virtual const wxString& AsString() const
{
if( m_isDeferredStr )
{
m_valueStr = m_lambdaStr();
m_isDeferredStr = false;
}
return m_valueStr;
}
virtual bool EqualTo( CONTEXT* aCtx, const VALUE* b ) const;
// NB: this is not an inverse of EqualTo as they both return false for undefined values.
virtual bool NotEqualTo( CONTEXT* aCtx, const VALUE* b ) const;
VAR_TYPE_T GetType() const { return m_type; };
void Set( double aValue )
{
m_type = VT_NUMERIC;
m_valueDbl = aValue;
}
void SetDeferredEval( std::function<double()> aLambda )
{
m_type = VT_NUMERIC;
m_lambdaDbl = aLambda;
m_isDeferredDbl = true;
}
void SetDeferredEval( std::function<wxString()> aLambda )
{
m_type = VT_STRING;
m_lambdaStr = aLambda;
m_isDeferredStr = true;
}
void Set( const wxString& aValue )
{
m_type = VT_STRING;
m_valueStr = aValue;
}
void Set( const VALUE &val )
{
m_type = val.m_type;
m_valueDbl = val.m_valueDbl;
if( m_type == VT_STRING )
m_valueStr = val.m_valueStr;
}
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private:
VAR_TYPE_T m_type;
mutable double m_valueDbl; // mutable to support deferred evaluation
mutable wxString m_valueStr; // mutable to support deferred evaluation
bool m_stringIsWildcard;
mutable bool m_isDeferredDbl;
std::function<double()> m_lambdaDbl;
mutable bool m_isDeferredStr;
std::function<wxString()> m_lambdaStr;
};
class VAR_REF
{
public:
VAR_REF() {};
virtual ~VAR_REF() {};
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virtual VAR_TYPE_T GetType() const = 0;
virtual VALUE GetValue( CONTEXT* aCtx ) = 0;
};
class CONTEXT
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{
public:
CONTEXT() :
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m_stack(),
m_stackPtr( 0 )
{
m_ownedValues.reserve( 20 );
}
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virtual ~CONTEXT()
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{
for( auto &v : m_ownedValues )
{
delete v;
}
}
VALUE* AllocValue()
{
m_ownedValues.emplace_back( new VALUE );
return m_ownedValues.back();
}
void Push( VALUE* v )
{
m_stack[ m_stackPtr++ ] = v;
}
VALUE* Pop()
{
if( m_stackPtr == 0 )
{
ReportError( _( "Malformed expression" ) );
return AllocValue();
}
return m_stack[ --m_stackPtr ];
}
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int SP() const
{
return m_stackPtr;
};
void SetErrorCallback( std::function<void( const wxString& aMessage, int aOffset )> aCallback )
{
m_errorCallback = std::move( aCallback );
}
bool HasErrorCallback() { return m_errorCallback != nullptr; }
void ReportError( const wxString& aErrorMsg );
private:
std::vector<VALUE*> m_ownedValues;
VALUE* m_stack[100]; // std::stack not performant enough
int m_stackPtr;
std::function<void( const wxString& aMessage, int aOffset )> m_errorCallback;
};
class UCODE
{
public:
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virtual ~UCODE();
void AddOp( UOP* uop )
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{
m_ucode.push_back(uop);
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}
VALUE* Run( CONTEXT* ctx );
wxString Dump() const;
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virtual std::unique_ptr<VAR_REF> CreateVarRef( const wxString& var, const wxString& field )
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{
return nullptr;
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};
virtual FUNC_CALL_REF CreateFuncCall( const wxString& name )
{
return nullptr;
};
protected:
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std::vector<UOP*> m_ucode;
};
class UOP
{
public:
UOP( int op, std::unique_ptr<VALUE> value ) :
m_op( op ),
m_ref(nullptr),
m_value( std::move( value ) )
{};
UOP( int op, std::unique_ptr<VAR_REF> vref ) :
m_op( op ),
m_ref( std::move( vref ) ),
m_value(nullptr)
{};
UOP( int op, FUNC_CALL_REF func, std::unique_ptr<VAR_REF> vref = nullptr ) :
m_op( op ),
m_func( std::move( func ) ),
m_ref( std::move( vref ) ),
m_value(nullptr)
{};
~UOP()
{
}
void Exec( CONTEXT* ctx );
wxString Format() const;
private:
int m_op;
FUNC_CALL_REF m_func;
std::unique_ptr<VAR_REF> m_ref;
std::unique_ptr<VALUE> m_value;
};
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class TOKENIZER
{
public:
void Restart( const wxString& aStr )
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{
m_str = aStr;
m_pos = 0;
}
void Clear()
{
m_str = "";
m_pos = 0;
}
int GetChar() const
{
if( m_pos >= m_str.length() )
return 0;
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return m_str[m_pos];
}
bool Done() const
{
return m_pos >= m_str.length();
}
void NextChar( int aAdvance = 1 )
{
m_pos += aAdvance;
}
size_t GetPos() const
{
return m_pos;
}
wxString GetChars( const std::function<bool( wxUniChar )>& cond ) const;
bool MatchAhead( const wxString& match,
const std::function<bool( wxUniChar )>& stopCond ) const;
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private:
wxString m_str;
size_t m_pos = 0;
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};
class COMPILER
{
public:
COMPILER();
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virtual ~COMPILER();
/*
* clear() should be invoked by the client if a new input string is to be processed. It
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* will reset the parser. User defined variables are retained.
*/
void Clear();
/* Used by the lemon parser */
void parseError( const char* s );
void parseOk();
int GetSourcePos() const { return m_sourcePos; }
void setRoot( LIBEVAL::TREE_NODE *root );
void freeTree( LIBEVAL::TREE_NODE *tree );
bool Compile( const wxString& aString, UCODE* aCode, CONTEXT* aPreflightContext );
void SetErrorCallback( std::function<void( const wxString& aMessage, int aOffset )> aCallback )
{
m_errorCallback = std::move( aCallback );
}
bool IsErrorPending() const { return m_errorStatus.pendingError; }
const ERROR_STATUS& GetError() const { return m_errorStatus; }
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void GcItem( TREE_NODE* aItem ) { m_gcItems.push_back( aItem ); }
void GcItem( wxString* aItem ) { m_gcStrings.push_back( aItem ); }
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protected:
enum LEXER_STATE
{
LS_DEFAULT = 0,
LS_STRING = 1,
};
LEXER_STATE m_lexerState;
bool generateUCode( UCODE* aCode, CONTEXT* aPreflightContext );
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void reportError( COMPILATION_STAGE stage, const wxString& aErrorMsg, int aPos = -1 );
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/* Begin processing of a new input string */
void newString( const wxString& aString );
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/* Tokenizer: Next token/value taken from input string. */
T_TOKEN getToken();
bool lexDefault( T_TOKEN& aToken );
bool lexString( T_TOKEN& aToken );
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int resolveUnits();
protected:
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/* Token state for input string. */
void* m_parser; // the current lemon parser state machine
TOKENIZER m_tokenizer;
char m_localeDecimalSeparator;
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std::unique_ptr<UNIT_RESOLVER> m_unitResolver;
int m_sourcePos;
bool m_parseFinished;
ERROR_STATUS m_errorStatus;
std::function<void( const wxString& aMessage, int aOffset )> m_errorCallback;
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TREE_NODE* m_tree;
std::vector<TREE_NODE*> m_gcItems;
std::vector<wxString*> m_gcStrings;
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};
} // namespace LIBEVAL
#endif /* LIBEVAL_COMPILER_H_ */