569 lines
12 KiB
C++
569 lines
12 KiB
C++
/*
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This file is part of libeval, a simple math expression evaluator
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Copyright (C) 2007 Michael Geselbracht, mgeselbracht3@gmail.com
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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
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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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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __LIBEVAL_COMPILER_H
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#define __LIBEVAL_COMPILER_H
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#include <cstddef>
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#include <functional>
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#include <map>
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#include <string>
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#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)
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// This gets leaked by python headers on MSVC only and will cause chaos
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#undef COMPILER
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#endif
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#define TR_OP_BINARY_MASK 0x200
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#define TR_OP_UNARY_MASK 0x100
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#define TR_OP_MUL 0x201
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#define TR_OP_DIV 0x202
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#define TR_OP_ADD 0x203
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#define TR_OP_SUB 0x204
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#define TR_OP_LESS 0x205
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#define TR_OP_GREATER 0x206
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#define TR_OP_LESS_EQUAL 0x207
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#define TR_OP_GREATER_EQUAL 0x208
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#define TR_OP_EQUAL 0x209
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#define TR_OP_NOT_EQUAL 0x20a
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#define TR_OP_BOOL_AND 0x20b
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#define TR_OP_BOOL_OR 0x20c
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#define TR_OP_BOOL_NOT 0x100
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#define TR_OP_FUNC_CALL 24
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#define TR_OP_METHOD_CALL 25
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#define TR_UOP_PUSH_VAR 1
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#define TR_UOP_PUSH_VALUE 2
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// This namespace is used for the lemon parser
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namespace LIBEVAL
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{
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class COMPILER;
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enum COMPILATION_STAGE
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{
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CST_PARSE = 0,
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CST_CODEGEN,
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CST_RUNTIME
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};
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struct ERROR_STATUS
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{
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bool pendingError = false;
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COMPILATION_STAGE stage;
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wxString message;
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int srcPos;
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};
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enum VAR_TYPE_T
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{
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VT_STRING = 1,
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VT_NUMERIC,
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VT_UNDEFINED,
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VT_PARSE_ERROR
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};
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enum TOKEN_TYPE_T
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{
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TR_UNDEFINED = 0,
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TR_NUMBER = 1,
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TR_IDENTIFIER = 2,
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TR_ASSIGN = 3,
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TR_STRUCT_REF = 4,
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TR_STRING = 5,
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TR_UNIT = 6,
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TR_ARG_LIST = 7,
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TR_NULL = 8
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};
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class UOP;
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class UCODE;
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class CONTEXT;
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class VAR_REF;
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typedef std::function<void( CONTEXT*, void* )> FUNC_CALL_REF;
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struct T_TOKEN_VALUE
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{
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wxString* str;
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double num;
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int idx;
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};
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// Lemon can't handle c'tors and d'tors, so we provide a poor-man's version.
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constexpr T_TOKEN_VALUE defaultTokenValue = { nullptr, 0.0, 0 };
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struct T_TOKEN
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{
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int token;
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T_TOKEN_VALUE value;
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};
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// Lemon can't handle c'tors and d'tors, so we provide a poor-man's version.
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constexpr T_TOKEN defaultToken = { TR_UNDEFINED, defaultTokenValue };
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class TREE_NODE
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{
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public:
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T_TOKEN_VALUE value;
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int op;
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TREE_NODE* leaf[2];
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UOP* uop;
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bool valid;
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bool isTerminal;
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bool isVisited;
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int srcPos;
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void SetUop( int aOp, double aValue );
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void SetUop( int aOp, const wxString& aValue, bool aStringIsWildcard );
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void SetUop( int aOp, std::unique_ptr<VAR_REF> aRef = nullptr );
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void SetUop( int aOp, FUNC_CALL_REF aFunc, std::unique_ptr<VAR_REF> aRef = nullptr );
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};
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TREE_NODE* newNode( LIBEVAL::COMPILER* compiler, int op,
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const T_TOKEN_VALUE& value = defaultTokenValue );
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class UNIT_RESOLVER
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{
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public:
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UNIT_RESOLVER()
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{
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}
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virtual ~UNIT_RESOLVER()
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{
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}
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virtual const std::vector<wxString>& GetSupportedUnits() const
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{
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static const std::vector<wxString> nullUnits;
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return nullUnits;
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}
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virtual wxString GetSupportedUnitsMessage() const
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{
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return wxEmptyString;
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}
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virtual double Convert( const wxString& aString, int unitType ) const
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{
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return 0.0;
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};
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};
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class VALUE
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{
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public:
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VALUE() :
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m_type( VT_UNDEFINED ),
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m_valueDbl( 0 ),
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m_stringIsWildcard( false ),
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m_isDeferredDbl( false ),
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m_isDeferredStr( false )
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{};
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VALUE( const wxString& aStr, bool aIsWildcard = false ) :
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m_type( VT_STRING ),
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m_valueDbl( 0 ),
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m_valueStr( aStr ),
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m_stringIsWildcard( aIsWildcard ),
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m_isDeferredDbl( false ),
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m_isDeferredStr( false )
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{};
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VALUE( const double aVal ) :
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m_type( VT_NUMERIC ),
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m_valueDbl( aVal ),
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m_stringIsWildcard( false ),
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m_isDeferredDbl( false ),
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m_isDeferredStr( false )
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{};
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virtual ~VALUE()
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{};
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virtual double AsDouble() const
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{
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if( m_isDeferredDbl )
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{
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m_valueDbl = m_lambdaDbl();
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m_isDeferredDbl = false;
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}
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return m_valueDbl;
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}
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virtual const wxString& AsString() const
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{
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if( m_isDeferredStr )
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{
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m_valueStr = m_lambdaStr();
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m_isDeferredStr = false;
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}
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return m_valueStr;
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}
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virtual bool EqualTo( CONTEXT* aCtx, const VALUE* b ) const;
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// NB: this is not an inverse of EqualTo as they both return false for undefined values.
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virtual bool NotEqualTo( CONTEXT* aCtx, const VALUE* b ) const;
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VAR_TYPE_T GetType() const { return m_type; };
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void Set( double aValue )
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{
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m_type = VT_NUMERIC;
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m_valueDbl = aValue;
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}
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void SetDeferredEval( std::function<double()> aLambda )
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{
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m_type = VT_NUMERIC;
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m_lambdaDbl = aLambda;
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m_isDeferredDbl = true;
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}
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void SetDeferredEval( std::function<wxString()> aLambda )
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{
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m_type = VT_STRING;
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m_lambdaStr = aLambda;
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m_isDeferredStr = true;
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}
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void Set( const wxString& aValue )
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{
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m_type = VT_STRING;
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m_valueStr = aValue;
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}
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void Set( const VALUE &val )
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{
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m_type = val.m_type;
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m_valueDbl = val.m_valueDbl;
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if( m_type == VT_STRING )
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m_valueStr = val.m_valueStr;
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}
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private:
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VAR_TYPE_T m_type;
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mutable double m_valueDbl; // mutable to support deferred evaluation
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mutable wxString m_valueStr; // mutable to support deferred evaluation
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bool m_stringIsWildcard;
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mutable bool m_isDeferredDbl;
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std::function<double()> m_lambdaDbl;
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mutable bool m_isDeferredStr;
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std::function<wxString()> m_lambdaStr;
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};
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class VAR_REF
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{
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public:
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VAR_REF() {};
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virtual ~VAR_REF() {};
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virtual VAR_TYPE_T GetType() const = 0;
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virtual VALUE* GetValue( CONTEXT* aCtx ) = 0;
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};
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class CONTEXT
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{
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public:
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CONTEXT() :
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m_stack(),
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m_stackPtr( 0 )
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{
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m_ownedValues.reserve( 20 );
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}
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virtual ~CONTEXT()
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{
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for( VALUE* v : m_ownedValues )
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{
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delete v;
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}
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}
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VALUE* AllocValue()
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{
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m_ownedValues.emplace_back( new VALUE );
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return m_ownedValues.back();
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}
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VALUE* StoreValue( VALUE* aValue )
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{
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m_ownedValues.emplace_back( aValue );
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return m_ownedValues.back();
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}
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void Push( VALUE* v )
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{
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m_stack[ m_stackPtr++ ] = v;
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}
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VALUE* Pop()
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{
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if( m_stackPtr == 0 )
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{
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ReportError( _( "Malformed expression" ) );
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return AllocValue();
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}
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return m_stack[ --m_stackPtr ];
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}
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int SP() const
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{
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return m_stackPtr;
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};
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void SetErrorCallback( std::function<void( const wxString& aMessage, int aOffset )> aCallback )
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{
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m_errorCallback = std::move( aCallback );
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}
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bool HasErrorCallback() { return m_errorCallback != nullptr; }
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void ReportError( const wxString& aErrorMsg );
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private:
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std::vector<VALUE*> m_ownedValues;
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VALUE* m_stack[100]; // std::stack not performant enough
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int m_stackPtr;
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std::function<void( const wxString& aMessage, int aOffset )> m_errorCallback;
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};
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class UCODE
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{
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public:
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virtual ~UCODE();
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void AddOp( UOP* uop )
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{
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m_ucode.push_back(uop);
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}
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VALUE* Run( CONTEXT* ctx );
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wxString Dump() const;
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virtual std::unique_ptr<VAR_REF> CreateVarRef( const wxString& var, const wxString& field )
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{
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return nullptr;
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};
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virtual FUNC_CALL_REF CreateFuncCall( const wxString& name )
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{
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return nullptr;
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};
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protected:
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std::vector<UOP*> m_ucode;
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};
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class UOP
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{
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public:
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UOP( int op, std::unique_ptr<VALUE> value ) :
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m_op( op ),
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m_ref(nullptr),
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m_value( std::move( value ) )
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{};
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UOP( int op, std::unique_ptr<VAR_REF> vref ) :
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m_op( op ),
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m_ref( std::move( vref ) ),
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m_value(nullptr)
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{};
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UOP( int op, FUNC_CALL_REF func, std::unique_ptr<VAR_REF> vref = nullptr ) :
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m_op( op ),
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m_func( std::move( func ) ),
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m_ref( std::move( vref ) ),
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m_value(nullptr)
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{};
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~UOP()
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{
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}
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void Exec( CONTEXT* ctx );
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wxString Format() const;
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private:
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int m_op;
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FUNC_CALL_REF m_func;
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std::unique_ptr<VAR_REF> m_ref;
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std::unique_ptr<VALUE> m_value;
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};
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class TOKENIZER
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{
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public:
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void Restart( const wxString& aStr )
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{
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m_str = aStr;
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m_pos = 0;
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}
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void Clear()
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{
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m_str = "";
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m_pos = 0;
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}
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int GetChar() const
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{
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if( m_pos >= m_str.length() )
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return 0;
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return m_str[m_pos];
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}
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bool Done() const
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{
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return m_pos >= m_str.length();
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}
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void NextChar( int aAdvance = 1 )
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{
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m_pos += aAdvance;
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}
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size_t GetPos() const
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{
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return m_pos;
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}
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wxString GetChars( const std::function<bool( wxUniChar )>& cond ) const;
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bool MatchAhead( const wxString& match,
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const std::function<bool( wxUniChar )>& stopCond ) const;
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private:
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wxString m_str;
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size_t m_pos = 0;
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};
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class COMPILER
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{
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public:
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COMPILER();
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virtual ~COMPILER();
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/*
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* 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.
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*/
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void Clear();
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/* Used by the lemon parser */
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void parseError( const char* s );
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void parseOk();
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int GetSourcePos() const { return m_sourcePos; }
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void setRoot( LIBEVAL::TREE_NODE *root );
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void freeTree( LIBEVAL::TREE_NODE *tree );
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bool Compile( const wxString& aString, UCODE* aCode, CONTEXT* aPreflightContext );
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void SetErrorCallback( std::function<void( const wxString& aMessage, int aOffset )> aCallback )
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{
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m_errorCallback = std::move( aCallback );
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}
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bool IsErrorPending() const { return m_errorStatus.pendingError; }
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const ERROR_STATUS& GetError() const { return m_errorStatus; }
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void GcItem( TREE_NODE* aItem ) { m_gcItems.push_back( aItem ); }
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void GcItem( wxString* aItem ) { m_gcStrings.push_back( aItem ); }
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protected:
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enum LEXER_STATE
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{
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LS_DEFAULT = 0,
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LS_STRING = 1,
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};
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LEXER_STATE m_lexerState;
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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 */
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void newString( const wxString& aString );
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/* Tokenizer: Next token/value taken from input string. */
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T_TOKEN getToken();
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bool lexDefault( T_TOKEN& aToken );
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bool lexString( T_TOKEN& aToken );
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int resolveUnits();
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protected:
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/* Token state for input string. */
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void* m_parser; // the current lemon parser state machine
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TOKENIZER m_tokenizer;
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char m_localeDecimalSeparator;
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std::unique_ptr<UNIT_RESOLVER> m_unitResolver;
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int m_sourcePos;
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bool m_parseFinished;
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ERROR_STATUS m_errorStatus;
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std::function<void( const wxString& aMessage, int aOffset )> m_errorCallback;
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TREE_NODE* m_tree;
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std::vector<TREE_NODE*> m_gcItems;
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std::vector<wxString*> m_gcStrings;
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};
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} // namespace LIBEVAL
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#endif /* LIBEVAL_COMPILER_H_ */
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