Abstract
The scanner's task is to transform a stream of characters into a stream of words in the input language. Each word must be classified into a syntactic category, or “part of speech.” The scanner is the only pass in the compiler to touch every character in the input program. Compiler writers place a premium on speed in scanning, in part, because the scanner's input is larger, in some measure, than that of any other pass, and, in part, because highly efficient techniques for scanning are easy to understand and to implement.
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