Package org.qdl_lang.expressions

Class ExpressionStemNode

java.lang.Object

org.qdl_lang.expressions.ExpressionStemNode

All Implemented Interfaces:

Serializable, ExpressionInterface, HasResultInterface, Statement

public class ExpressionStemNode
extends Object
implements ExpressionInterface

Models a stem.

Created by Jeff Gaynor
on 3/5/21 at 5:58 AM

See Also:

Serialized Form

Field Summary

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
ExpressionStemNode()

Method Summary

Modifier and Type	Method	Description
protected Object	doLeftSVCase(ExpressionInterface leftArg, List<ExpressionInterface> indices, State state)	Case that the left hand argument is a stem variable.
protected Object	doLeftSVCase(ExpressionInterface leftArg, ExpressionInterface rightArg, State state)
QDLValue	evaluate(State state)	Since this is a dyadic operation in the parser, the result will be a tree of objects of the form
String	getAlias()
ArrayList<ExpressionInterface>	getArguments()
ExpressionInterface	getLeftArg()
int	getNodeType()	QDL is not strongly typed but Java is, so each node type should have a unique integer and conditionals should use that, not the instanceof operator.
protected QDLValue	getOrSetValue(State state, boolean setValue, QDLValue newValue)
QDLValue	getResult()
int	getResultType()
ExpressionInterface	getRightArg()
List<String>	getSourceCode()
TokenPosition	getTokenPosition()
boolean	hasAlias()
boolean	hasTokenPosition()
boolean	isEvaluated()
ExpressionInterface	makeCopy()
void	setAlias(String alias)
void	setArguments(ArrayList<ExpressionInterface> arguments)
void	setEvaluated(boolean evaluated)
void	setLeftArg(ExpressionInterface swri)
void	setResult(Object result)	Convenience method.This should turn the object into a proper QDLValue as needed.
void	setResult(QDLValue object)
void	setRightArg(ExpressionInterface swri)
void	setSourceCode(List<String> sourceCode)
void	setTokenPosition(TokenPosition tokenPosition)	Set the location of this token from the parser.
QDLValue	setValue(State state, QDLValue newValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionStemNode

public ExpressionStemNode()

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

getArguments

public ArrayList<ExpressionInterface> getArguments()

setArguments

public void setArguments(ArrayList<ExpressionInterface> arguments)

getResult

public QDLValue getResult()

Specified by:

getResult in interface HasResultInterface

setResult

public void setResult(QDLValue object)

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

getResultType

public int getResultType()

Specified by:

getResultType in interface HasResultInterface

isEvaluated

public boolean isEvaluated()

Specified by:

isEvaluated in interface HasResultInterface

setEvaluated

public void setEvaluated(boolean evaluated)

Specified by:

setEvaluated in interface HasResultInterface

getLeftArg

public ExpressionInterface getLeftArg()

setLeftArg

public void setLeftArg(ExpressionInterface swri)

setRightArg

public void setRightArg(ExpressionInterface swri)

getRightArg

public ExpressionInterface getRightArg()

evaluate

public QDLValue evaluate(State state)

Since this is a dyadic operation in the parser, the result will be a tree of objects of the form

              x
            /  \
        ...     scalar
      x
    / \
   A   B
  

Specified by:

evaluate in interface Statement

Parameters:

state -

Returns:

setValue

public QDLValue setValue(State state,
                         QDLValue newValue)

getOrSetValue

protected QDLValue getOrSetValue(State state,
                                 boolean setValue,
                                 QDLValue newValue)

doLeftSVCase

protected Object doLeftSVCase(ExpressionInterface leftArg,
                              ExpressionInterface rightArg,
                              State state)

doLeftSVCase

protected Object doLeftSVCase(ExpressionInterface leftArg,
                              List<ExpressionInterface> indices,
                              State state)

Case that the left hand argument is a stem variable. This does the lookup. In the variable case, a StemMultiIndex is created and interacts with the State to do the resolutions.

Parameters:

leftArg -

state -

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

makeCopy

public ExpressionInterface makeCopy()

Specified by:

makeCopy in interface ExpressionInterface

getNodeType

public int getNodeType()

Description copied from interface: ExpressionInterface

QDL is not strongly typed but Java is, so each node type should have a unique integer and conditionals should use that, not the instanceof operator. This allows for efficient programming with switch statements rather than a bevy of conditionals (potentially each of which gets done even if the correct case has been handled).

Specified by:

getNodeType in interface ExpressionInterface

Returns: