Package org.qdl_lang.expressions
Class Nilad
- java.lang.Object
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- org.qdl_lang.expressions.ExpressionImpl
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- org.qdl_lang.expressions.Nilad
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- All Implemented Interfaces:
Serializable
,ExpressionNode
,ExpressionInterface
,HasResultInterface
,Statement
public class Nilad extends ExpressionImpl
This would be an operator that takes no arguments. Niladic user defined functions (no arguments) abount. It is possible to have a niladic operator in QDL, but as of yet there is no basic of one. One possible way would be to use these as control symbols, such a special operator that means to, say, open an editor window. These would also require special handling inthe parser.Created by Jeff Gaynor
on 1/13/20 at 3:36 PM- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.qdl_lang.expressions.ExpressionImpl
arguments, result, valence
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Fields inherited from interface org.qdl_lang.statements.ExpressionInterface
ALL_INDICES_NODE, ALT_IF_NODE, ASSIGNMENT_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
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Constructor Summary
Constructors Constructor Description Nilad(int operatorType)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
evaluate(State state)
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.ExpressionNode
makeCopy()
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Methods inherited from class org.qdl_lang.expressions.ExpressionImpl
evalArg, evalLastArg, evaluatedArgs, getAlias, getArgAt, getArgCount, getArguments, getEvaluatedArgs, getLastArg, getOperatorType, getResult, getResultType, getSourceCode, getTokenPosition, hasAlias, hasEvaluatedArgs, hasTokenPosition, isEvaluated, isSizeQuery, setAlias, setArguments, setEvaluated, setEvaluatedArgs, setOperatorType, setResult, setResultType, setSizeQuery, setSourceCode, setTokenPosition, toString
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Method Detail
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makeCopy
public ExpressionNode makeCopy()
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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).- Returns:
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