Package org.qdl_lang.expressions

Class ExpressionImpl

java.lang.Object

org.qdl_lang.expressions.ExpressionImpl

All Implemented Interfaces:

Serializable, ExpressionNode, ExpressionInterface, HasResultInterface, Statement

Direct Known Subclasses:

AltIfExpressionNode, ANode2, AxisExpression, ClosedSliceNode, ConstantNode, Dyad, DyadicFunctionReferenceNode, ESN2, FunctionReferenceNode, LambdaDefinitionNode, ModuleExpression, Monad, Nilad, OpenSliceNode, Polyad, SelectExpressionNode, StemExtractionNode, VariableNode

public abstract class ExpressionImpl
extends Object
implements ExpressionNode

Main workhorse class. Expressions from the parser are some subclass of this.

Created by Jeff Gaynor
on 1/13/20 at 3:15 PM

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected ArrayList<ExpressionInterface>	arguments
protected QDLValue	result
protected int	valence	The valence is the number of arguments this expression allows.

Fields inherited from interface org.qdl_lang.statements.ExpressionInterface

ALL_INDICES_NODE, ALT_IF_NODE, ASSIGNMENT_NODE, AXIS_RESTRICTION_NODE, CLOSED_SLICE_NODE, COMPARISON_DYAD_NODE, CONSTANT_NODE, DYAD_NODE, DYADIC_FUNCTION_REFERENCE_NODE, EXPRESSION_STEM_NODE, EXPRESSION_STEM2_NODE, FUNCTION_REFERENCE_NODE, LAMBDA_DEFINITION_NODE, LIST_NODE, MODULE_NODE, MONAD_NODE, NILAD_NODE, OPEN_SLICE_NODE, PARENTHESIZED_NODE, PARSE_EXPRESSION_BLOCK_NODE, PARSE_STATEMENT_BLOCK_NODE, POLYAD_NODE, QDL_NULL_NODE, SELECT_NODE, SET_NODE, STEM_ENTRY_NODE, STEM_EXTRACTION_NODE, STEM_NODE, UNKNOWN_NODE, VARIABLE_NODE

Constructor Summary

Constructors

Constructor	Description
ExpressionImpl()
ExpressionImpl(int operatorType)
ExpressionImpl(int operatorType, TokenPosition tokenPosition)
ExpressionImpl(TokenPosition tokenPosition)

Method Summary

Modifier and Type	Method	Description
void	addArgument(ExpressionInterface expr)
QDLValue	evalArg(int index, State state)
QDLValue	evalLastArg(State state)
List<QDLValue>	evaluatedArgs(State state)	Evaluate the arguments using the given state and set the setEvaluatedArgs(List) Calling this evaluates the args.
String	getAlias()
ExpressionInterface	getArgAt(int index)
int	getArgCount()
ArrayList<ExpressionInterface>	getArguments()
List<QDLValue>	getEvaluatedArgs()	The arguments to this polyad that have been evaluated vis a vis a specific state.
ExpressionInterface	getLastArg()
int	getOperatorType()	This is the operator equiavalent of a function.
QDLValue	getResult()
int	getResultType()
List<String>	getSourceCode()
TokenPosition	getTokenPosition()
boolean	hasAlias()
boolean	hasEvaluatedArgs()
boolean	hasTokenPosition()
boolean	isEvaluated()
boolean	isSizeQuery()	Used when resolving function references to query the operator itself as to how many arguments it accepts.
void	setAlias(String alias)
void	setArguments(ArrayList<ExpressionInterface> arguments)
void	setEvaluated(boolean evaluated)
void	setEvaluatedArgs(List<QDLValue> evaluatedArgs)
void	setOperatorType(int operatorType)
void	setResult(Object result)	Convenience method.This should turn the object into a proper QDLValue as needed.
void	setResult(QDLValue result)
void	setSizeQuery(boolean sizeQuery)
void	setSourceCode(List<String> sourceCode)
void	setTokenPosition(TokenPosition tokenPosition)	Set the location of this token from the parser.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.qdl_lang.statements.ExpressionInterface

getNodeType, makeCopy

Methods inherited from interface org.qdl_lang.statements.Statement

evaluate

Field Detail

valence

protected int valence

The valence is the number of arguments this expression allows.

0 = niladic 1 = monadic 2 = dyadic 3 = polyadic (more than 2)

arguments

protected ArrayList<ExpressionInterface> arguments

result

protected QDLValue result

Constructor Detail

ExpressionImpl

public ExpressionImpl()

ExpressionImpl

public ExpressionImpl(TokenPosition tokenPosition)

ExpressionImpl

public ExpressionImpl(int operatorType,
                      TokenPosition tokenPosition)

ExpressionImpl

public ExpressionImpl(int operatorType)

Method Detail

setTokenPosition

public void setTokenPosition(TokenPosition tokenPosition)

Description copied from interface: Statement

Set the location of this token from the parser. This is used for error notifications later.

Specified by:

setTokenPosition in interface Statement

getTokenPosition

public TokenPosition getTokenPosition()

Specified by:

getTokenPosition in interface Statement

hasTokenPosition

public boolean hasTokenPosition()

Specified by:

hasTokenPosition in interface Statement

hasAlias

public boolean hasAlias()

Specified by:

hasAlias in interface ExpressionInterface

getAlias

public String getAlias()

Specified by:

getAlias in interface ExpressionInterface

setAlias

public void setAlias(String alias)

Specified by:

setAlias in interface ExpressionInterface

getArgCount

public int getArgCount()

Specified by:

getArgCount in interface ExpressionNode

getLastArg

public ExpressionInterface getLastArg()

evalLastArg

public QDLValue evalLastArg(State state)

getArguments

public ArrayList<ExpressionInterface> getArguments()

Specified by:

getArguments in interface ExpressionNode

getArgAt

public ExpressionInterface getArgAt(int index)

Specified by:

getArgAt in interface ExpressionNode

evalArg

public QDLValue evalArg(int index,
                        State state)

setArguments

public void setArguments(ArrayList<ExpressionInterface> arguments)

Specified by:

setArguments in interface ExpressionNode

isEvaluated

public boolean isEvaluated()

Specified by:

isEvaluated in interface HasResultInterface

setEvaluated

public void setEvaluated(boolean evaluated)

Specified by:

setEvaluated in interface HasResultInterface

getResult

public QDLValue getResult()

Specified by:

getResult in interface HasResultInterface

isSizeQuery

public boolean isSizeQuery()

Used when resolving function references to query the operator itself as to how many arguments it accepts.

Returns:

setSizeQuery

public void setSizeQuery(boolean sizeQuery)

getResultType

public int getResultType()

Specified by:

getResultType in interface HasResultInterface

setResult

public void setResult(QDLValue result)

Specified by:

setResult in interface HasResultInterface

setResult

public void setResult(Object result)

Description copied from interface: HasResultInterface

Convenience method.This should turn the object into a proper QDLValue as needed.

Specified by:

setResult in interface HasResultInterface

setOperatorType

public void setOperatorType(int operatorType)

Specified by:

setOperatorType in interface ExpressionNode

getOperatorType

public int getOperatorType()

This is the operator equiavalent of a function. EvaluatorInterface.UNKNOWN_VALUE is the default.

Specified by:

getOperatorType in interface ExpressionNode

Returns:

getSourceCode

public List<String> getSourceCode()

Specified by:

getSourceCode in interface Statement

setSourceCode

public void setSourceCode(List<String> sourceCode)

Specified by:

setSourceCode in interface Statement

toString

public String toString()

Overrides:

toString in class Object

getEvaluatedArgs

public List<QDLValue> getEvaluatedArgs()

The arguments to this polyad that have been evaluated vis a vis a specific state. The intent is that this is used in evaluating functions sent via a module, where the arguments are evaluated in the ambient state and forwarded to the module for later evaluation. This has to be done since there is no way to figure out the state in general where these evaluate except at exactly the point where they are called.

Returns:

evaluatedArgs

public List<QDLValue> evaluatedArgs(State state)

Evaluate the arguments using the given state and set the setEvaluatedArgs(List) Calling this evaluates the args.

Parameters:

state -

Returns:

setEvaluatedArgs

public void setEvaluatedArgs(List<QDLValue> evaluatedArgs)

hasEvaluatedArgs

public boolean hasEvaluatedArgs()

addArgument

public void addArgument(ExpressionInterface expr)