By Torben Ægidius Mogensen
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Note that the principle of the longest match takes precedence over the order of definition of tokens, so even though the string starts with the keyword ✐❢, which has higher priority than variable names, the variable name is chosen because it is longer. Modern languages like C, Java or SML follow this convention, and so do most lexer generators, but some (mostly older) languages like FORTRAN do not. When other conventions are used, lexers must either be written by hand to handle these conventions or the conventions used by the lexer generator must be side-stepped.
When describing tokens for a programming language) the increase in size is usually modest, which is why most lexical analysers are based on DFAs. 4, can convert any regular expression to a DFA. The conversion is done by simulating all possible paths in an NFA at once. This means that we operate with sets of NFA states: When we have several choices of a next state, we take all of the choices simultaneously and form a set of the possible next-states. The idea is that such a set of NFA states will become a single DFA state.
DFAs have the same expressive power as NFAs: A DFA is a special case of NFA and any NFA can (as we shall shortly see) be converted to an equivalent DFA. 10). , when describing tokens for a programming language) the increase in size is usually modest, which is why most lexical analysers are based on DFAs. 4, can convert any regular expression to a DFA. The conversion is done by simulating all possible paths in an NFA at once. This means that we operate with sets of NFA states: When we have several choices of a next state, we take all of the choices simultaneously and form a set of the possible next-states.