EECS 665 โ Fall 2008
Assignment 1
cpretty - lexical analysis for a C pretty printer
cpretty performs lexical analysis to produce a pretty printing of a C file. The C file is read from
standard input. A pretty printing is produced to standard output. The pretty printing will be in
the form that can be processed by L
A
T
E
X. For instance, you can invoke the executable to produce
a pretty printing of test1.c with the following commands.
cpretty <test1.c >test1.tex
latex test1.tex
dvips โo test1.ps test1.dvi
You should accomplish this assignment by writing a single lex file. The following tables indicate
when specific fonts should be used and the escape sequence in L
A
T
E
Xto switch to that font. Note
that the backslash character is to specify an escape sequence.
lexical elements font
reserved words times roman bold
comments times roman slanted
strings typewriter bold
character literals typewriter
numbers times roman bold slanted
everything else standard
font L
A
T
E
Xescape sequence
times roman \textrm{}
typewriter \texttt{}
bold \textbf{}
slanted \textit{}
standard
The list of C reserved words are given below.
auto double int struct
break else long switch
case extern register typedef
char float return union
continue for short unsigned
default goto sizeof void
do if static while
Here are some other L
A
T
E
X commands you might need:
1. Backslash โ \backslash
2. Space โ ~
3. Special characters (&,%,$,#, ,{,}) should be preceded by a \.
4. Math symbols (+,โ,โ, /, >, <, =) should be enclosed within $ signs, like $+$, $>$.
5. Blank line starts a new paragraph.
6. Lines can be explicitly terminated using two backslashes (\\).
7. Additional vertical spacing โ \smallskip, \medskip, \bigskip
The code inside the lex file must be in C so it will be compatible with lex. Create a file called
cpretty.l. You should at least have lex rules to detect the following cases. You may find additional
rules are necessary.
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