see A.g4 for getter syntax; use e() not gete(). adding ContextGetterDecl.java

tool/playground/A.g4

@@ -1,5 +1,16 @@
 grammar A;
 
+/*
+Auto gen:
+public Token ID() { }
+public List<Token> x() { }
+public Token x(int i) { }
+public eContext e() { }
+or: public List<eContext> e() { }
+*/
+z : ID x+=INT+ e {List x = $INT; Token t = $ID;} ;
+
+/*
 s : Q q=e {Object o=$q.v;} -> one
   | z=e {Object o=$z.v;}
   ;
@@ -9,9 +20,9 @@ e returns [int v]
   | b=e '+' e
   | '(' x=e ')'
   ;
-
-INT : '9';
+*/
 /*
+INT : '9';
 a : u=A A -> x
   | B b {Token t=$B;} -> y
   | C+  -> z

tool/resources/org/antlr/v4/tool/templates/codegen/Java/Java.stg

@@ -493,6 +493,8 @@ TokenListDecl(t) ::= "List\<Token> <t.name> = new ArrayList\<Token>()"
 RuleContextDecl(r) ::= "<r.ctxName> <r.name>"
 RuleContextListDecl(rdecl) ::= "List\<<rdecl.ctxName>> <rdecl.name> = new ArrayList\<<rdecl.ctxName>>()"
 
+ContextGetterDecl(g) ::= "public <g.decl> get<t.name>() { }"
+
 LexerRuleContext() ::= "RuleContext"
 
 /** The rule context name is the rule followed by a suffix; e.g.,
@@ -500,10 +502,10 @@ LexerRuleContext() ::= "RuleContext"
  */
 RuleContextNameSuffix() ::= "Context"
 
-ImplicitTokenLabel(tokenName) ::= "<tokenName>"
-ImplicitRuleLabel(ruleName)	  ::= "<ruleName>"
+ImplicitTokenLabel(tokenName) ::= "_<tokenName>"
+ImplicitRuleLabel(ruleName)	  ::= "_<ruleName>"
 ImplicitSetLabel(id)		  ::= "_tset<id>"
-ListLabelName(label)		  ::= "<label>_list"
+ListLabelName(label)		  ::= "<label>"
 
 CaptureNextToken(d) ::= "<d.varName> = _input.LT(1);"
 CaptureNextTokenType(d) ::= "<d.varName> = _input.LA(1);"
@@ -531,7 +533,7 @@ public static class <s.name> extends <superClass><if(interfaces)> implements <in
 
 AltLabelStructDecl(s,attrs,visitorDispatchMethods) ::= <<
 public static class <s.name> extends <currentRule.name>Context {
-	<attrs:{a | public <a>;}; separator="\n">
+	<attrs:{a | public <a.decl> get<a.name>() {\}}; separator="\n">
 	public <s.name>(<currentRule.name>Context ctx) { copyFrom(ctx); }
 	<visitorDispatchMethods; separator="\n">
 }

tool/src/org/antlr/v4/codegen/ParserFactory.java

@@ -91,6 +91,12 @@ public class ParserFactory extends DefaultOutputModelFactory {
 		LabeledOp matchOp = new MatchToken(this, (TerminalAST) ID);
 		if ( labelAST!=null ) {
 			String label = labelAST.getText();
+			if ( labelAST.parent.getType() == ANTLRParser.PLUS_ASSIGN ) {
+				TokenListDecl l = getTokenListLabelDecl(label);
+				getCurrentRuleFunction().addContextDecl(ID.getAltLabel(), l);
+			}
+
+//			String label = labelAST.getText();
 			Decl d = getTokenLabelDecl(label);
 			((MatchToken)matchOp).labels.add(d);
 			getCurrentRuleFunction().addContextDecl(ID.getAltLabel(), d);

tool/src/org/antlr/v4/codegen/model/decl/ContextGetterDecl.java

@@ -0,0 +1,10 @@
+package org.antlr.v4.codegen.model.decl;
+
+import org.antlr.v4.codegen.OutputModelFactory;
+
+/** public Token getID() { } */
+public class ContextGetterDecl extends Decl {
+	public ContextGetterDecl(OutputModelFactory factory, String name, String decl) {
+		super(factory, name, decl);
+	}
+}