Expressions are comprised of full or potentially partial parts of a full statement that may not necessary make up an entire valid statement on their own. For example, while a Binary Operator such as "3 + 5;"" is a valid statement on its own, the full statement "3 + 5 + 6;" must be broken down into two expressions which together form the statement as well as determining precedence. More...

#include <openvdb_ax/ast/AST.h>

Inherits Statement.

Inherited by ArrayPack, ArrayUnpack, AssignExpression, BinaryOperator, Cast, CommaOperator, Crement, FunctionCall, TernaryOperator, UnaryOperator, ValueBase, and Variable.

Public Types
using	UniquePtr = std::unique_ptr< Expression >

enum	NodeType { TreeNode, StatementListNode, BlockNode, ConditionalStatementNode, CommaOperatorNode, LoopNode, KeywordNode, AssignExpressionNode, CrementNode, UnaryOperatorNode, BinaryOperatorNode, TernaryOperatorNode, CastNode, AttributeNode, FunctionCallNode, ExternalVariableNode, DeclareLocalNode, ArrayPackNode, ArrayUnpackNode, LocalNode, ValueBoolNode, ValueInt16Node, ValueInt32Node, ValueInt64Node, ValueFloatNode, ValueDoubleNode, ValueStrNode }
	An enumerated list of node types for all concrete node types. These can be used for faster evaluation of a given concrete node using the virtual function table via Node::nodetype() rather than performing a dynamic_cast/calling Node::isType. More...

using	Ptr = std::shared_ptr< Node >

Public Member Functions
	~Expression () override=default

virtual Expression *	copy () const override=0
	The deep copy method for a Node. More...

const Statement *	basetype () const override
	Virtual method for accessing a node's base class. Note that if this is called explicitly on an instance of ast::Node (the top most base class) a nullptr is returned. This is primarily used by the Visitor to support hierarchical visits. More...

Name/Type
virtual NodeType	nodetype () const =0
	Virtual method for accessing node type information. More...

virtual const char *	nodename () const =0
	Virtual method for accessing node name information. More...

virtual const char *	subname () const =0
	Virtual method for accessing node name information. More...

template<typename NodeT >
bool	isType () const
	Query whether or not this node is of a specific (derived) type. This method should be used to check if a node is of a particular abstract type. When checking concrete types, it's generally more efficient to check the return value of Node::nodetype() More...

Child Queries
virtual size_t	children () const =0
	Virtual method for accessing child information. Returns the number of children a given AST node owns. More...

virtual const Node *	child (const size_t index) const =0
	Virtual method for accessing child information. Returns a const pointer to a child node at the given index. If the index is out of range, a nullptr is returned. More...

int64_t	childidx () const
	Returns the child index of this node in relation to its parent, or -1 if no valid index is found (usually representing the top most node (i.e. Tree) More...

Replacement
bool	replace (Node *node)
	In place replacement. Attempts to replace this node at its specific location within its Abstract Syntax Tree. On a successful replacement, this node is destroyed, the provided node is inserted in its place and ownership is transferred to the parent node. No further calls to this node can be made on successful replacements. More...

virtual bool	replacechild (const size_t index, Node *node)
	Virtual method that attempted to replace a child at a given index with a provided node type. More...

Parent
const Node *	parent () const
	Access a const pointer to this nodes parent. More...

void	setParent (Node *parent)
	Set this node's parent. This is used during construction of an AST and should not be used. More...

Detailed Description

Expressions are comprised of full or potentially partial parts of a full statement that may not necessary make up an entire valid statement on their own. For example, while a Binary Operator such as "3 + 5;"" is a valid statement on its own, the full statement "3 + 5 + 6;" must be broken down into two expressions which together form the statement as well as determining precedence.

Member Typedef Documentation

using Ptr = std::shared_ptr<Node>

inherited

using UniquePtr = std::unique_ptr<Expression>

Member Enumeration Documentation

enum NodeType

inherited

An enumerated list of node types for all concrete node types. These can be used for faster evaluation of a given concrete node using the virtual function table via Node::nodetype() rather than performing a dynamic_cast/calling Node::isType.

Note: This is sometimes referred to as "manual RTTI". We use this technique combine with single dispatch due to opting for CRTP on the main visitor and no templated virtual method support in C++. i.e. no way to double dispatch: visit<template T>(Visitor<T>*); Abstract (pure-virtual) nodes are not listed here. Node::isType should be used to determine if a node is of a given abstract type.

Enumerator
TreeNode
StatementListNode
BlockNode
ConditionalStatementNode
CommaOperatorNode
LoopNode
KeywordNode
AssignExpressionNode
CrementNode
UnaryOperatorNode
BinaryOperatorNode
TernaryOperatorNode
CastNode
AttributeNode
FunctionCallNode
ExternalVariableNode
DeclareLocalNode
ArrayPackNode
ArrayUnpackNode
LocalNode
ValueBoolNode
ValueInt16Node
ValueInt32Node
ValueInt64Node
ValueFloatNode
ValueDoubleNode
ValueStrNode

Constructor & Destructor Documentation

~Expression ( )

overridedefault

Member Function Documentation

const Statement* basetype ( ) const

inlineoverridevirtual

Virtual method for accessing a node's base class. Note that if this is called explicitly on an instance of ast::Node (the top most base class) a nullptr is returned. This is primarily used by the Visitor to support hierarchical visits.

Returns: Returns the current node as its base class type.

Reimplemented from Statement.

Reimplemented in Value< std::string >, Value< T >, Local, ExternalVariable, Attribute, ArrayPack, ArrayUnpack, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, CommaOperator, ValueBase, and Variable.

virtual const Node* child ( const size_t index ) const

pure virtualinherited

Virtual method for accessing child information. Returns a const pointer to a child node at the given index. If the index is out of range, a nullptr is returned.

Note: This may still return a nullptr even if the given index is valid if the child node has not been created.

Parameters

index The child index to query

Returns: A Pointer to the child node, or a nullptr if none exists.

Implemented in DeclareLocal, ArrayPack, ArrayUnpack, Keyword, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Tree, Block, StatementList, ValueBase, and Variable.

int64_t childidx ( ) const

inlineinherited

Returns the child index of this node in relation to its parent, or -1 if no valid index is found (usually representing the top most node (i.e. Tree)

Returns: The child index of this node

virtual size_t children ( ) const

pure virtualinherited

Virtual method for accessing child information. Returns the number of children a given AST node owns.

Returns: The number of children this node owns.

Implemented in DeclareLocal, ArrayPack, ArrayUnpack, Keyword, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Tree, Block, StatementList, ValueBase, and Variable.

virtual Expression* copy ( ) const

overridepure virtual

The deep copy method for a Node.

Returns: A deep copy of the current node and all its children

Implements Statement.

Implemented in Value< std::string >, Value< T >, Local, ExternalVariable, Attribute, ArrayPack, ArrayUnpack, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, CommaOperator, ValueBase, and Variable.

bool isType ( ) const

inlineinherited

Query whether or not this node is of a specific (derived) type. This method should be used to check if a node is of a particular abstract type. When checking concrete types, it's generally more efficient to check the return value of Node::nodetype()

Template Parameters

NodeT The node type to query against.

Returns: True if this node is of the given type, false otherwise.

virtual const char* nodename ( ) const

pure virtualinherited

Virtual method for accessing node name information.

Returns: Returns the node class name

Implemented in Value< std::string >, Value< T >, DeclareLocal, Local, ExternalVariable, Attribute, ArrayPack, ArrayUnpack, Keyword, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Tree, Block, and StatementList.

virtual NodeType nodetype ( ) const

pure virtualinherited

Virtual method for accessing node type information.

Note: This method should be used when querying a concrete nodes type.

Returns: Returns the enumerated node type from the NodeType list

Implemented in Value< std::string >, Value< T >, DeclareLocal, Local, ExternalVariable, Attribute, ArrayPack, ArrayUnpack, Keyword, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Tree, Block, and StatementList.

const Node* parent ( ) const

inlineinherited

Access a const pointer to this nodes parent.

Note: Can be a nullptr if this is the top most node in an AST (usually a Tree)

Returns: A const pointer to this node's parent node

bool replace ( Node * node )

inlineinherited

In place replacement. Attempts to replace this node at its specific location within its Abstract Syntax Tree. On a successful replacement, this node is destroyed, the provided node is inserted in its place and ownership is transferred to the parent node. No further calls to this node can be made on successful replacements.

Note: A replacement will fail if this node is the top most node within an AST hierarchy or if the provided node type is not a compatible type for the required abstract storage. For example, if this node is an Attribute being held on a BinaryOperator, only concrete nodes derived from an Expression can be used as a replacement.; This method will dynamic_cast the provided node to check to see if it's a compatible type.

Parameters

node	The node to insert on a successful replacement.

Returns: True if the replacement was successful, resulting in destruction of this class and ownership transferal of the provided node. False otherwise, where this and the provided node are unchanged.

bool replacechild	(	const size_t	index,
		Node *	node
	)

inlinevirtualinherited

Virtual method that attempted to replace a child at a given index with a provided node type.

Note: See Node::replace for a more detailed description

Parameters

index	The child index where a replacement should be attempted
node	The node to insert on a successful replacement.

Returns: True if the replacement was successful, false otherwise

Reimplemented in DeclareLocal, ArrayPack, ArrayUnpack, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Block, and StatementList.

void setParent ( Node * parent )

inlineinherited

Set this node's parent. This is used during construction of an AST and should not be used.

Parameters

parent The parent to set

virtual const char* subname ( ) const

pure virtualinherited

Virtual method for accessing node name information.

Returns: Returns the short node class name

Implemented in Value< std::string >, Value< T >, DeclareLocal, Local, ExternalVariable, Attribute, ArrayPack, ArrayUnpack, Keyword, FunctionCall, Cast, UnaryOperator, Crement, AssignExpression, TernaryOperator, BinaryOperator, ConditionalStatement, Loop, CommaOperator, Tree, Block, and StatementList.

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation