NAME
Math::Calc - Simple example illustrating how to use Parse::Eyapp
Download
svn checkout http://misc-perl-utilities.googlecode.com/svn/trunk/calculator
Building the Application
$ perl Makefile.PL
Checking if your kit is complete...
Looks good
Writing Makefile for Math::Calc
$ make rmcalc
rm -f lib/Math/Calc.pm
$ make calc
eyapp -m Math::Calc -o lib/Math/Calc.pm lib/Math/Calc
perl -Ilib -c lib/Math/Calc.pm
lib/Math/Calc.pm syntax OK
$ cd scripts/
scripts$ ./calc.pl
a=2*3
6Executing with an Input File
scripts$ cat expressions1
a=2*3
b=4
c=9+1
b= (b+1)*b
scripts$ ./calc.pl expressions1
6
4
10
20Executing an Input with Errors
scripts$ cat witherrors
a=2
b=3/(a-2)
c=9
2
scripts$ ./calc.pl witherrors
2
Illegal division by zero at line 2.
9
2Executing with the yydebug option set
scripts$ ./calc.pl -debug
a=2
----------------------------------------
In state 0:
Stack:[0]
Don't need token.
Reduce using rule 3 (STAR-1 --> /* empty */): Back to state 0, then go to state 1.
----------------------------------------
In state 1:
Stack:[0,1]
Need token. Got >VAR<
Shift and go to state 8.
----------------------------------------
In state 8:
Stack:[0,1,8]
Need token. Got >=<
Shift and go to state 21.
----------------------------------------
In state 21:
Stack:[0,1,8,21]
Need token. Got >NUM<
Shift and go to state 5.
----------------------------------------
In state 5:
Stack:[0,1,8,21,5]
Don't need token.
Reduce using rule 8 (exp --> NUM): Back to state 21, then go to state 29.
----------------------------------------
In state 29:
Stack:[0,1,8,21,29]
Need token. Got ><0A><
Reduce using rule 10 (exp --> VAR = exp): Back to state 1, then go to state 6.
----------------------------------------
In state 6:
Stack:[0,1,6]
Shift and go to state 18.
----------------------------------------
In state 18:
Stack:[0,1,6,18]
Don't need token.
Reduce using rule 6 (line --> exp \n): 2
Back to state 1, then go to state 11.
----------------------------------------
In state 11:
Stack:[0,1,11]
Don't need token.
Reduce using rule 2 (STAR-1 --> STAR-1 line): Back to state 0, then go to state 1.
----------------------------------------
In state 1:
Stack:[0,1]
Need token. Got ><
Reduce using rule 4 (input --> STAR-1): Back to state 0, then go to state 2.
----------------------------------------
In state 2:
Stack:[0,2]
Don't need token.
Reduce using rule 1 (start --> input): Back to state 0, then go to state 3.
----------------------------------------
In state 3:
Stack:[0,3]
Shift and go to state 12.
----------------------------------------
In state 12:
Stack:[0,3,12]
Don't need token.
Accept.Building a Standalone Distribution
$ export EYAPPENV='-s'
$ make rmcalc
rm -f lib/Math/Calc.pm
$ make calc
eyapp -m Math::Calc -s -o lib/Math/Calc.pm lib/Math/Calc
perl -Ilib -c lib/Math/Calc.pm
lib/Math/Calc.pm syntax OK
$ make distNow the distribution can be used in a machine where Parse::Eyapp isn't installed:
casiano@europa:/tmp/Math-Calc-1.0$ perl -MParse::Eyapp -e 0
Can't locate Parse/Eyapp.pm in @INC (@INC contains:
BEGIN failed--compilation aborted.
casiano@europa:/tmp$ tar xvzf Math-Calc-1.0.tar.gz
casiano@europa:/tmp/Math-Calc-1.0$ perl Makefile.PL
Checking if your kit is complete...
Looks good
Writing Makefile for Math::Calc
casiano@europa:/tmp/Math-Calc-1.0$ make
casiano@europa:/tmp/Math-Calc-1.0$ make test
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/01smoke..............ok
t/02semanticerrors.....ok
t/03syntacticerrors....ok
All tests successful.
Files=3, Tests=10, 0 wallclock secs ( 0.12 cusr + 0.01 csys = 0.13 CPU)LICENCE AND COPYRIGHT
Copyright (c) 2006-2008 Casiano Rodriguez-Leon (casiano@ull.es). All rights reserved.
These modules are free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.