Winter 2013 uw cse 401 michael ringenburg 20 10 11413

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Unformatted text preview: – may get this for free… •  If needed, run DFA un:l no more transi:ons. If not in a final state, backtrack to last seen final state. Not always necessary. Winter 2013 UW CSE 401 (Michael Ringenburg) 18 9 1/14/13 Punng it together Chat finds t Languages •  A CSE341:aProgramminghe next token eLanguages scanner is DFA tSE341: Programming ach :me it is called (and advances the input pointer to the token’s end). Lecture 1 Lecture 1 •  Every “final” sourse Mechanics returns) a token. e ourse C tate of a DFA Cmits ( Mechanics ML Variable Bindings •  For example: Variable Bindings ML == becomes <equal> (not <assign> <assign>) Dan Grossman D ( becomes an Grossman <leqParen> Fall 2011 Fall 2011 private becomes <private> •  Compiler writer (you!) choose the token names •  Also, there may be addi:onal data associated with tokens … \r\n might count lines; all tokens might include line #; integer literals include value; etc. Winter 2013 UW CSE 401 (Michael Ringenburg) 19 DFA => Code, by Hand CSE341: Programming CSE341: Programming Languages Languages •  Op:on 1: One procedure per DFA state –  Reads in a character,...
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