[Go] Make SetTokenSource public

This aligns the golang runtime with other languages where the SetTokenSource
is publicly available. We require this in our usage of antlr4. We currently
have a fork for the sole purpose of this.

Author: fsaintjacques

runtime/Go/antlr/v4/lexer.go

@@ -159,7 +159,7 @@ func (b *BaseLexer) GetTokenFactory() TokenFactory {
 	return b.factory
 }
 
-func (b *BaseLexer) setTokenFactory(f TokenFactory) {
+func (b *BaseLexer) SetTokenFactory(f TokenFactory) {
 	b.factory = f
 }
 

runtime/Go/antlr/v4/parser.go

@@ -317,8 +317,8 @@ func (p *BaseParser) GetTokenFactory() TokenFactory {
 }
 
 // setTokenFactory is used to tell our token source and error strategy about a new way to create tokens.
-func (p *BaseParser) setTokenFactory(factory TokenFactory) {
-	p.input.GetTokenSource().setTokenFactory(factory)
+func (p *BaseParser) SetTokenFactory(factory TokenFactory) {
+	p.input.GetTokenSource().SetTokenFactory(factory)
 }
 
 // GetATNWithBypassAlts - the ATN with bypass alternatives is expensive to create, so we create it

runtime/Go/antlr/v4/token_source.go

@@ -12,6 +12,6 @@ type TokenSource interface {
 	GetCharPositionInLine() int
 	GetInputStream() CharStream
 	GetSourceName() string
-	setTokenFactory(factory TokenFactory)
+	SetTokenFactory(factory TokenFactory)
 	GetTokenFactory() TokenFactory
 }