[TypeScript] Runtime Lexer missing "channel" setter and getter.

[kaby76]

According to the Definitive ANTLR 4 Reference: An ANTLR lexer creates a Token object after matching a lexical rule. Each request for a token starts in Lexer.nextToken(), which calls emit() once it has identified a token. emit() collects information from the current state of the lexer to build the token. It accesses fields _type, _text, _channel, _tokenStartCharIndex, _tokenStartLine, and _tokenStartCharPositionInLine. You can set the state of these with the various setter methods such as setType(). For example, the following rule turns enum into an identifier if enumIsKeyword is false: ENUM : 'enum' {if (!enumIsKeyword) setType(Identifier);} ;

Unfortunately, for the TypeScript target, some of the setters and getters are missing. We really need these.

• channel

Note, some of the fields are directly accessible rather than through getters and setters, some with leading underscore, some not.

If I want to override emit(), I'll need a token factory. Otherwise, I will be making an assumption that the token implementation is always CommonToken.