org.antlr.v4.runtime.atn

类 SemanticContext.AND

java.lang.Object

org.antlr.v4.runtime.atn.SemanticContext

org.antlr.v4.runtime.atn.SemanticContext.Operator

org.antlr.v4.runtime.atn.SemanticContext.AND

封闭类:

SemanticContext

public static class SemanticContext.AND
extends SemanticContext.Operator

A semantic context which is true whenever none of the contained contexts is false.

嵌套类概要

从类继承的嵌套类/接口 org.antlr.v4.runtime.atn.SemanticContext

SemanticContext.AND, SemanticContext.Operator, SemanticContext.OR, SemanticContext.PrecedencePredicate, SemanticContext.Predicate

字段概要

字段

限定符和类型	字段和说明
SemanticContext[]	opnds

从类继承的字段 org.antlr.v4.runtime.atn.SemanticContext

NONE

构造器概要

构造器

构造器和说明
AND(SemanticContext a, SemanticContext b)

方法概要

限定符和类型	方法和说明
boolean	equals(Object obj)
<T> boolean	eval(Recognizer<T,?> parser, RuleContext parserCallStack) For context independent predicates, we evaluate them without a local context (i.e., null context).
SemanticContext	evalPrecedence(Recognizer<?,?> parser, RuleContext parserCallStack) Evaluate the precedence predicates for the context and reduce the result.
Collection<SemanticContext>	getOperands() Gets the operands for the semantic context operator.
int	hashCode()
String	toString()

从类继承的方法 org.antlr.v4.runtime.atn.SemanticContext

and, or

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料

opnds

@NotNull
public final SemanticContext[] opnds

构造器详细资料

AND

public AND(@NotNull
           SemanticContext a,
           @NotNull
           SemanticContext b)

方法详细资料

getOperands

public Collection<SemanticContext> getOperands()

从类复制的说明: SemanticContext.Operator

Gets the operands for the semantic context operator.

指定者:

getOperands 在类中 SemanticContext.Operator

返回:

a collection of SemanticContext operands for the operator.

equals

public boolean equals(Object obj)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

eval

public <T> boolean eval(Recognizer<T,?> parser,
                        RuleContext parserCallStack)

For context independent predicates, we evaluate them without a local context (i.e., null context). That way, we can evaluate them without having to create proper rule-specific context during prediction (as opposed to the parser, which creates them naturally). In a practical sense, this avoids a cast exception from RuleContext to myruleContext.

For context dependent predicates, we must pass in a local context so that references such as $arg evaluate properly as _localctx.arg. We only capture context dependent predicates in the context in which we begin prediction, so we passed in the outer context here in case of context dependent predicate evaluation.

The evaluation of predicates by this context is short-circuiting, but unordered.

指定者:

eval 在类中 SemanticContext

evalPrecedence

public SemanticContext evalPrecedence(Recognizer<?,?> parser,
                                      RuleContext parserCallStack)

从类复制的说明: SemanticContext

Evaluate the precedence predicates for the context and reduce the result.

覆盖:

evalPrecedence 在类中 SemanticContext

参数:

parser - The parser instance.

返回:

The simplified semantic context after precedence predicates are evaluated, which will be one of the following values.

• SemanticContext.NONE: if the predicate simplifies to true after precedence predicates are evaluated.
• null: if the predicate simplifies to false after precedence predicates are evaluated.
• this: if the semantic context is not changed as a result of precedence predicate evaluation.
• A non-null SemanticContext: the new simplified semantic context after precedence predicates are evaluated.

toString

public String toString()

覆盖:

toString 在类中 Object