Syntax.h

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//
// Copyright Contributors to the MaterialX Project
// SPDX-License-Identifier: Apache-2.0
//
 
#ifndef MATERIALX_SYNTAX_H
#define MATERIALX_SYNTAX_H
 
 
#include <MaterialXGenShader/Export.h>
 
#include <MaterialXCore/Definition.h>
#include <MaterialXCore/Library.h>
#include <MaterialXCore/Value.h>
 
MATERIALX_NAMESPACE_BEGIN
 
class Syntax;
class TypeSyntax;
class TypeDesc;
class ShaderPort;
 
using SyntaxPtr = shared_ptr<Syntax>;
using ConstSyntaxPtr = shared_ptr<const Syntax>;
using TypeSyntaxPtr = shared_ptr<TypeSyntax>;
 
using IdentifierMap = std::unordered_map<string, size_t>;
 
class MX_GENSHADER_API Syntax
{
  public:
    enum Punctuation
    {
        PARENTHESES,
        CURLY_BRACKETS,
        SQUARE_BRACKETS,
        DOUBLE_SQUARE_BRACKETS
    };
 
  public:
    virtual ~Syntax() { }
 
    void registerTypeSyntax(const TypeDesc* type, TypeSyntaxPtr syntax);
 
    void registerReservedWords(const StringSet& names);
 
    void registerInvalidTokens(const StringMap& tokens);
 
    const StringSet& getReservedWords() const { return _reservedWords; }
 
    const StringMap& getInvalidTokens() const { return _invalidTokens; }
 
    const TypeSyntax& getTypeSyntax(const TypeDesc* type) const;
 
    const vector<TypeSyntaxPtr>& getTypeSyntaxes() const { return _typeSyntaxes; }
 
    const TypeDesc* getTypeDescription(const TypeSyntaxPtr& typeSyntax) const;
 
    const string& getTypeName(const TypeDesc* type) const;
 
    virtual string getOutputTypeName(const TypeDesc* type) const;
 
    const string& getTypeAlias(const TypeDesc* type) const;
 
    const string& getTypeDefinition(const TypeDesc* type) const;
 
    const string& getDefaultValue(const TypeDesc* type, bool uniform = false) const;
 
    virtual string getValue(const TypeDesc* type, const Value& value, bool uniform = false) const;
 
    virtual string getValue(const ShaderPort* port, bool uniform = false) const;
 
    virtual string getSwizzledVariable(const string& srcName, const TypeDesc* srcType, const string& channels, const TypeDesc* dstType) const;
 
    virtual ValuePtr getSwizzledValue(ValuePtr value, const TypeDesc* srcType, const string& channels, const TypeDesc* dstType) const;
 
    virtual const string& getInputQualifier() const { return EMPTY_STRING; };
 
    virtual const string& getOutputQualifier() const { return EMPTY_STRING; };
 
    virtual const string& getConstantQualifier() const = 0;
 
    virtual const string& getUniformQualifier() const { return EMPTY_STRING; };
 
    virtual const string& getNewline() const { return NEWLINE; };
 
    virtual const string& getIndentation() const { return INDENTATION; };
 
    virtual const string& getStringQuote() const { return STRING_QUOTE; };
 
    virtual const string& getIncludeStatement() const { return INCLUDE_STATEMENT; };
 
    virtual const string& getSingleLineComment() const { return SINGLE_LINE_COMMENT; };
 
    virtual const string& getBeginMultiLineComment() const { return BEGIN_MULTI_LINE_COMMENT; };
 
    virtual const string& getEndMultiLineComment() const { return END_MULTI_LINE_COMMENT; };
 
    virtual const string& getSourceFileExtension() const = 0;
 
    virtual string getArrayTypeSuffix(const TypeDesc*, const Value&) const { return EMPTY_STRING; };
 
    virtual string getArrayVariableSuffix(const TypeDesc* type, const Value& value) const;
 
    virtual bool typeSupported(const TypeDesc* type) const;
 
    virtual void makeValidName(string& name) const;
 
    virtual void makeIdentifier(string& name, IdentifierMap& identifiers) const;
 
    virtual string getVariableName(const string& name, const TypeDesc* type, IdentifierMap& identifiers) const;
 
    virtual bool remapEnumeration(const string& value, const TypeDesc* type, const string& enumNames,
                                  std::pair<const TypeDesc*, ValuePtr>& result) const;
 
    static const string NEWLINE;
    static const string SEMICOLON;
    static const string COMMA;
 
  protected:
    Syntax();
 
    vector<TypeSyntaxPtr> _typeSyntaxes;
    std::unordered_map<const TypeDesc*, size_t> _typeSyntaxByType;
 
    StringSet _reservedWords;
    StringMap _invalidTokens;
 
    static const string INDENTATION;
    static const string STRING_QUOTE;
    static const string INCLUDE_STATEMENT;
    static const string SINGLE_LINE_COMMENT;
    static const string BEGIN_MULTI_LINE_COMMENT;
    static const string END_MULTI_LINE_COMMENT;
 
    static const std::unordered_map<char, size_t> CHANNELS_MAPPING;
};
 
class MX_GENSHADER_API TypeSyntax
{
  public:
    virtual ~TypeSyntax() { }
 
    const string& getName() const { return _name; }
 
    const string& getTypeAlias() const { return _typeAlias; }
 
    const string& getTypeDefinition() const { return _typeDefinition; }
 
    const string& getDefaultValue(bool uniform) const { return uniform ? _uniformDefaultValue : _defaultValue; }
 
    const StringVec& getMembers() const { return _members; }
 
    virtual string getValue(const ShaderPort* port, bool uniform) const;
 
    virtual string getValue(const Value& value, bool uniform) const = 0;
 
    virtual string getValue(const StringVec& values, bool uniform) const = 0;
 
  protected:
    TypeSyntax(const string& name, const string& defaultValue, const string& uniformDefaultValue,
               const string& typeAlias, const string& typeDefinition, const StringVec& members);
 
    string _name;                // type name
    string _defaultValue;        // default value syntax
    string _uniformDefaultValue; // default value syntax when assigned to uniforms
    string _typeAlias;           // type alias if needed in source code
    string _typeDefinition;      // custom type definition if needed in source code
    StringVec _members;          // syntax for member access
 
    static const StringVec EMPTY_MEMBERS;
};
 
class MX_GENSHADER_API ScalarTypeSyntax : public TypeSyntax
{
  public:
    ScalarTypeSyntax(const string& name, const string& defaultValue, const string& uniformDefaultValue,
                     const string& typeAlias = EMPTY_STRING, const string& typeDefinition = EMPTY_STRING);
 
    string getValue(const Value& value, bool uniform) const override;
    string getValue(const StringVec& values, bool uniform) const override;
};
 
class MX_GENSHADER_API StringTypeSyntax : public ScalarTypeSyntax
{
  public:
    StringTypeSyntax(const string& name, const string& defaultValue, const string& uniformDefaultValue,
                     const string& typeAlias = EMPTY_STRING, const string& typeDefinition = EMPTY_STRING);
 
    string getValue(const Value& value, bool uniform) const override;
};
 
class MX_GENSHADER_API AggregateTypeSyntax : public TypeSyntax
{
  public:
    AggregateTypeSyntax(const string& name, const string& defaultValue, const string& uniformDefaultValue,
                        const string& typeAlias = EMPTY_STRING, const string& typeDefinition = EMPTY_STRING,
                        const StringVec& members = EMPTY_MEMBERS);
 
    string getValue(const Value& value, bool uniform) const override;
    string getValue(const StringVec& values, bool uniform) const override;
};
 
MATERIALX_NAMESPACE_END
 
#endif