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A radical advent to Compiler development with Unix through Prentice corridor software program sequence.
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The second rule causes the pattern and not the second, more general pattern to recognize from the input. g, As has been demonstrated in the previous section, the first disambiguating rule can backfire if used carelessly. The second rule, however, encourages an arrangement in which the most general pattern, for an identifier, is placed last, with more selective patterns preceding it to pick off exceptions. 1Les78a], ms Consider the following recognition problem: when typing German texts on an American keyboard, umlaut characters are most quickly typed as ae, oe, ue, etc.
The very last pattern in the lexical analyzer: return token(yytext [OD ; {other} takes care of returning the character values for all unrecognized single character terminal symbols. This pattern is placed last so that a single letter or digit is recognized by I %lert, Terminal symbol names can also be introduced through a first appearance in %nonassoc statements. We prefer to always define terminal symbols first with %token. %right, o CHAPTER 3 LANGUAGE RECOGNITION 41 earlier patterns as an Identifier or a Constant.
In this section we discuss a general approach to this problem. We begin with the main() routine. It turns out that it is quite convenient to always be able to invoke the C preprocessor to obtain standard file inclusion, t ext replacement, and conditional compilation facilities. Also, the C preprocessor will remove C-style comments, unless the —C option is specified. Our standard main() routine will invoke the C preprocessor if at least one of the option arguments known t o the preprocessor is used; we can thus always provoke preprocessing through the or —E option: 3 1 — CHAPTER 3 LANGUAGE RECOGNITION 43 The routine checks all arguments.