compile flex parser and run with test input file

bunnyhophop.sh

#!/bin/bash

clear

filex="mylexer.l"   # input file for flex
folex="lex.yy.c" # output file of flex
fogcc="mylexer" # outpuf file of gcc
fe1="myprog.fc"  # example file to run

now="$(date +"%r")" # Get the system time now
echo "FC compiler $now"

# check if flex input file exists
if [ ! -f "$filex" ]; then
    echo "Lexer file not found!"
    exit 1
fi

echo
echo
echo "program: $fe1 "
echo "---------------------------------"
cat $fe1
echo "---------------------------------"
echo
echo

echo "-> flexing $filex "
flex "$filex"

# check if compilation produced output file
if [ ! -f "$folex" ]; then
    echo "fail"
    echo "Lexer output file not found!"
    exit 2
fi


echo "-> compiling lexer"
# detect os
if [ "$(uname)" == "Darwin" ]; then
    # Do something under Mac OS X platform
    gcc -o "$fogcc" "$folex" -ll
elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
    # Do something under GNU/Linux platform
    gcc -o "$fogcc" "$folex" -lfl
fi

gcc -o "$fogcc" "$folex" -ll

# check if compilation produced output file
if [ ! -f "$fogcc" ]; then
    echo "fail"
    echo "gcc output file not found!"
    exit 3
fi

# clean up files
if [ -f $folex ] ; then
    echo "clean up files: $folex"
    rm $folex
fi

echo "running mylexer < $fe1"
echo "---------------------------------"
echo
./mylexer < "$fe1"