May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Lexical Analyzer 69
The flex program reads user-specified input files, or its standard input if no file names are given,
for a description of a Scanner to generate. The description is in the form of pairs of regular expressions
and C code, called rules. Flex generates a C source file named, lex.yy.c, which defines the function
yylex(). The file lex.yy.c can be compiled and linked to produce an executable. When the
executable is run, it analyzes its input for occurrences of text matching the regular expressions for
each rule. Whenever it finds a match, it executes the corresponding C code.
If you are using Linux as your program development environment, ...
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