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This le is only used when building ex, not when ex executes. bck' on some systems). 23 De ciencies / Bugs Some trailing context patterns cannot be properly matched and generate warning messages ("dangerous trailing context"). These are patterns where the ending of the rst part of the rule matches the beginning of the second part, such as "zx*/xy*", where the 'x*' matches the 'x' at the beginning of the trailing context. ) For some trailing context rules, parts which are actually xed-length are not recognized as such, leading to the abovementioned performance loss.

With a complicated set of rules it's not uncommon to get hundreds of messages. If one can decipher them, though, it often only takes a dozen or so rules to eliminate the backing up (though it's easy to make a mistake and have an error rule accidentally match a valid token. A possible future flex feature will be to automatically add rules to eliminate backing up). It's important to keep in mind that you gain the bene ts of eliminating backing up only if you eliminate every instance of backing up.

Similarly, the comment for State #9 concerns when "fooba" has been scanned and an 'r' does not follow. The nal comment reminds us that there's no point going to all the trouble of removing backing up from the rules unless we're using `-Cf' or `-CF', since there's no performance gain doing so with compressed scanners. The way to remove the backing up is to add "error" rules: %% foo foobar return TOK_KEYWORD return TOK_KEYWORD fooba | 39 foob fo | { /* false alarm, not really a keyword */ return TOK_ID } Eliminating backing up among a list of keywords can also be done using a "catch-all" rule: %% foo foobar a-z]+ return TOK_KEYWORD return TOK_KEYWORD return TOK_ID This is usually the best solution when appropriate.

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