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List of lexer functions

• setInput: resets the lexer, sets new input
• input: consumes and returns one char from the input
• unput: unshifts one char (or a string) into the input
• more: When called from action, caches matched text and appends it on next action
• reject: When called from action, signals the lexer that this rule fails to match the input, so the next matching rule (regex) should be tested instead.
• less: retain first n characters of the match
• pastInput: displays already matched input, i.e. for error messages
• upcomingInput: displays upcoming input, i.e. for error messages
• showPosition: displays the character position where the lexing error occurred, i.e. for error messages
• test_match: test the lexed token: return FALSE when not a match, otherwise return token
• next: return next match in input
• lex: return next match that has a token
• begin: activates a new lexer condition state (pushes the new lexer condition state onto the condition stack)
• popState: pop the previously active lexer condition state off the condition stack
• _currentRules: produce the lexer rule set which is active for the currently active lexer condition state
• topState: return the currently active lexer condition state; when an index argument is provided it produces the N-th previous condition state, if available
• pushState: alias for begin(condition)
• stateStackSize: return the number of states currently on the stack