Unix

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

By Doug Brown, John Levine, Tony Mason

This e-book indicates you the way to take advantage of Unix utilities, lex andyacc, in software improvement. those instruments aid programmers construct compilers and interpreters, yet additionally they have a much wider diversity of purposes. you will discover instructional sections for beginner clients, reference sections for complicated clients, and an in depth index. each one application is defined in a bankruptcy that covers uncomplicated utilization and easy, stand-alone purposes. you are going to the right way to enforce a whole SQL grammar, with complete pattern code. significant MS-DOS and Unix types of lex and yacc are explored intensive. additionally covers Bison and Flex.

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Extra info for Lex and Yacc [parsers, UNIX

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A typical simple rule has a single symbol on the right-hand side as in the object rule which is defined to be a NOUN. The symbol on the left-hand side of the rule can Lex and Yacc then be used like a token in other rules. From this, we build complex grammars. In our grammar we use the special character I ", which introduces a rule with the same left-hand side as the previous one. , in our grammar a subject can be either a NOUN or a PRONOUN. The action part of a rule consists of a C block, beginning with "{" and ending with "I".

For example: matches "I", “ill", or "123456" but not an empty string. ) Matches zero or one occurrence of the preceding regular expression. For example: matches a signed number including an optional leading minus. Matches either the preceding regular expression or the following regular expression. For example: cow I pig I sheep matches any of the three words. " . . " Interprets everything within the quotation marks literally-metacharacters other than C escape sequences lose their meaning. Matches the preceding regular expression but only if followed by / the following regular expression.

O-91+ Notice the " \ " before the period to make it a literal period rather than a wild card character. 31415". But it won't match "0" or "2". We'd like to combine our definitions to match them as well. Leaving out our unary minus, we could use: We use the grouping symbols "0" to specify what the regular expressions are for the " I " operation. [0-9]+)) We can expand this further by allowing a float-style exponent to be specified as well. First, let's write a regular expression for an exponent: This matches an upper- or lowercase letter E, then an optional plus or minus sign, then a string of digits.

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