Download Lex and Yacc [parsers, UNIX by Doug Brown, John Levine, Tony Mason PDF

By Doug Brown, John Levine, Tony Mason

This publication indicates you the way to exploit Unix utilities, lex andyacc, in application improvement. those instruments aid programmers construct compilers and interpreters, yet additionally they have a much broader variety of purposes. you can find instructional sections for beginner clients, reference sections for complex clients, and a close index. each one application is defined in a bankruptcy that covers easy utilization and straightforward, stand-alone functions. you are going to the way to enforce a whole SQL grammar, with complete pattern code. significant MS-DOS and Unix models of lex and yacc are explored extensive. additionally covers Bison and Flex.

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Sample text

We have added two definitions here. The first provides our description of a word: any non-empty combination of characters except space, tab, and newline. The second describes our end-of-line character, newline. We use these definitions in the second section of the file, the rules section. The rules section contains the patterns and actions that specify the lexer. Here is our sample word count's rules section: %% iwordl { wordcount++; charcount += yyleng; 1 ieoll i chartount++; linecount++; } charcount++; The beginning of the rules section is marked by a "%%".

Prepositional phrases in the subject, adverbs modifying adjectives, etc. " You might want to add new word and token types AUXVERB for auxiliary verbs. " How could you handle them? Try adding a new word and token type NOUN-OR-VERB, and add it as an alternative to the rules for subject, verb, and object. How well does this work? When people hear an unfamiliar word, they can usually guess from the context what part of speech it is. Could the lexer characterize new words on the fly? For example, a word that ends in "ing" is probably a verb, and one that follows "a" or "the" is probably a noun or an adjective.

In our final example of this chapter, Example 1-4, we expand our earlier grammar to recognize a richer, although by no means complete, set uf sentences. We invite you to experiment further with this example-you will see how difficult English is to describe in an unambiguous way. f eof (yyin) yyparse ( ; 1 I. 1 yyerror ( s 1 char * s ; { fprintf (stderr, "%s\nn,s); 1 We have expanded our sentence rule by introducing a traditional grammar formulation from elementary school English class: a sentence can be either a simple sentence or a compound sentence which contains two or more independent clauses joined with a coordinating conjunction.

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