ParserRuleContext

A rule invocation record for parsing.

Contains all of the information about the current rule not stored in the RuleContext. It handles parse tree children list, Any ATN state tracing, and the default values available for rule invocations: start, stop, rule index, current alt number.

Subclasses made for each rule and grammar track the parameters, return values, locals, and labels specific to that rule. These are the objects that are returned from rules.

Note text is not an actual field of a rule return value; it is computed from start and stop using the input stream's toString() method. I could add a ctor to this so that we can pass in and store the input stream, but I'm not sure we want to do that. It would seem to be undefined to get the .text property anyway if the rule matches tokens from multiple input streams.

I do not use getters for fields of objects that are used simply to group values such as this aggregate. The getters/setters are there to satisfy the superclass interface.

class ParserRuleContext : RuleContext {

static __gshared

ParserRuleContext EMPTY;

ParseTree[] children;

Token start;

Token stop;

RecognitionException exception;

this();

this(ParserRuleContext parent, int invokingStateNumber);

void copyFrom(ParserRuleContext ctx);

void enterRule(ParseTreeListener listener);

void exitRule(ParseTreeListener listener);

ParseTree addAnyChild(ParseTree t);

RuleContext addChild(RuleContext ruleInvocation);

TerminalNode addChild(TerminalNode t);

void removeLastChild();

TerminalNode addChild(Token matchedToken);

ErrorNode addErrorNode(Token badToken);

ParserRuleContext getParent();

ParseTree getChild(int i);

auto getChild(int i);

TerminalNode getToken(int ttype, int i);

TerminalNode[] getTokens(int ttype);

T getRuleContext(int i);

T[] getRuleContexts();

int getChildCount();

Interval getSourceInterval();

Token getStart();

Token getStop();

string toInfoString(InterfaceParser recognizer);

}

Constructors

this this(): Undocumented in source.
this this(ParserRuleContext parent, int invokingStateNumber): Undocumented in source.

Members

Functions

addAnyChild ParseTree addAnyChild(ParseTree t): Add a parse tree node to this as a child. Works for internal and leaf nodes. Does not set parent link; other add methods must do that. Other addChild methods call this.
addChild RuleContext addChild(RuleContext ruleInvocation): Undocumented in source. Be warned that the author may not have intended to support it.
addChild TerminalNode addChild(TerminalNode t): Add a token leaf node child and force its parent to be this node.
addChild TerminalNode addChild(Token matchedToken): Undocumented in source. Be warned that the author may not have intended to support it.
addErrorNode ErrorNode addErrorNode(Token badToken): Undocumented in source. Be warned that the author may not have intended to support it.
copyFrom void copyFrom(ParserRuleContext ctx): COPY a ctx (I'm deliberately not using copy constructor) to avoid confusion with creating node with parent. Does not copy children (except error leaves).
enterRule void enterRule(ParseTreeListener listener): Undocumented in source. Be warned that the author may not have intended to support it.
exitRule void exitRule(ParseTreeListener listener): Undocumented in source. Be warned that the author may not have intended to support it.
getChild ParseTree getChild(int i): @uml @override
getChild auto getChild(int i): Undocumented in source. Be warned that the author may not have intended to support it.
getChildCount int getChildCount(): @uml @override
getParent ParserRuleContext getParent(): Override to make type more specific @uml @override
getRuleContext T getRuleContext(int i): Undocumented in source. Be warned that the author may not have intended to support it.
getRuleContexts T[] getRuleContexts(): Undocumented in source. Be warned that the author may not have intended to support it.
getSourceInterval Interval getSourceInterval(): @uml @override
getStart Token getStart(): Get the initial token in this context. Note that the range from start to stop is inclusive, so for rules that do not consume anything (for example, zero length or error productions) this token may exceed stop.
getStop Token getStop(): Get the final token in this context. Note that the range from start to stop is inclusive, so for rules that do not consume anything (for example, zero length or error productions) this token may precede start.
getToken TerminalNode getToken(int ttype, int i): Undocumented in source. Be warned that the author may not have intended to support it.
getTokens TerminalNode[] getTokens(int ttype): Undocumented in source. Be warned that the author may not have intended to support it.
removeLastChild void removeLastChild(): Used by enterOuterAlt to toss out a RuleContext previously added as we entered a rule. If we have # label, we will need to remove generic ruleContext object.
toInfoString string toInfoString(InterfaceParser recognizer): Used for rule context info debugging during parse-time, not so much for ATN debugging

Static variables

EMPTY ParserRuleContext EMPTY;: @uml @__gshared

Variables

children ParseTree[] children;: If we are debugging or building a parse tree for a visitor, we need to track all of the tokens and rule invocations associated with this rule's context. This is empty for parsing w/o tree constr. operation because we don't the need to track the details about how we parse this rule.
exception RecognitionException exception;: The exception that forced this rule to return. If the rule successfully completed, this is {@code null}.
start Token start;: Undocumented in source.
stop Token stop;: Undocumented in source.

Inherited Members

From RuleContext

EMPTY ParserRuleContext EMPTY;: Undocumented in source.
parent RuleContext parent;: Undocumented in source.
invokingState int invokingState;: Undocumented in source.
depth int depth(): Undocumented in source. Be warned that the author may not have intended to support it.
isEmpty bool isEmpty(): A context is empty if there is no invoking state; meaning nobody called current context.
getSourceInterval Interval getSourceInterval(): satisfy the ParseTree / SyntaxTree interface
getRuleContext RuleContext getRuleContext(): Undocumented in source. Be warned that the author may not have intended to support it.
getPayload RuleContext getPayload(): Undocumented in source. Be warned that the author may not have intended to support it.
getText Variant getText(): Return the combined text of all child nodes. This method only considers tokens which have been added to the parse tree. <p> Since tokens on hidden channels (e.g. whitespace or comments) are not added to the parse trees, they will not appear in the output of this method.
getRuleIndex int getRuleIndex(): Undocumented in source. Be warned that the author may not have intended to support it.
getAltNumber int getAltNumber(): For rule associated with this parse tree internal node, return the outer alternative number used to match the input. Default implementation does not compute nor store this alt num. Create a subclass of ParserRuleContext with backing field and set option contextSuperClass. to set it.
setAltNumber void setAltNumber(int altNumber): Set the outer alternative number for this context node. Default implementation does nothing to avoid backing field overhead for trees that don't need it. Create a subclass of ParserRuleContext with backing field and set option contextSuperClass.
getChild ParseTree getChild(int i): Undocumented in source. Be warned that the author may not have intended to support it.
getChildCount int getChildCount(): Undocumented in source. Be warned that the author may not have intended to support it.
accept Variant accept(ParseTreeVisitor visitor): Undocumented in source. Be warned that the author may not have intended to support it.
toStringTree string toStringTree(InterfaceRecognizer recog): Print out a whole tree, not just a node, in LISP format (root child1 .. childN). Print just a node if this is a leaf. We have to know the recognizer so we can get rule names.
toStringTree string toStringTree(string[] ruleNames): Undocumented in source. Be warned that the author may not have intended to support it.
toStringTree string toStringTree(): Undocumented in source. Be warned that the author may not have intended to support it.
toString string toString(): @uml @override
toString string toString(InterfaceRecognizer recog): Undocumented in source. Be warned that the author may not have intended to support it.
toString string toString(string[] ruleNames): Undocumented in source. Be warned that the author may not have intended to support it.
toString string toString(InterfaceRecognizer recog, RuleContext stop): recog null unless ParserRuleContext, in which case we use subclass toString(...)
toString string toString(string[] ruleNames, RuleContext stop): Undocumented in source. Be warned that the author may not have intended to support it.
getParent RuleContext getParent(): Undocumented in source. Be warned that the author may not have intended to support it.
setParent void setParent(RuleContext parent): since 4.7. {@see ParseTree#setParent} comment