#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     makeParser
#
# Description
#     Pregenerate ragel code and/or lemon parser headers
#
#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

Usage: ${0##*/} [options]

options:
  -prefix=NAME      Common prefix for parser and scanner
  -parser=FILE      Generate lemon parser header
  -scanner=FILE     Generate ragel scanner code
  -parser           Use 'LemonParser.lyy' for non-prefixed parser name
  -parser-m4        Use 'LemonParser.lyy-m4' for non-prefixed parser name
  -scanner          Use 'Scanner.rl' for non-prefixed scanner name
  -code             Generate lemon parser code
  -with-debug       Retain intermediate files (eg, m4 output)
  -remove           Remove generated code
  -h, -help         Print the usage

Pregenerate ragel code and/or lemon parser headers

USAGE
    exit 1
}

#------------------------------------------------------------------------------
# Parse arguments and options
#------------------------------------------------------------------------------

unset prefix parser scanner optCode optDebug optRemove
while [ "$#" -gt 0 ]
do
    case "$1" in
    (-h | -help*) usage ;;

    (-prefix=*)   prefix="${1#*=}" ;;
    (-parser=*)   parser="${1#*=}" ;;
    (-scanner=*)  scanner="${1#*=}" ;;

    (-parser)     parser=LemonParser.lyy ;;
    (-parser-m4)  parser=LemonParser.lyy-m4 ;;
    (-scanner)    scanner=Scanner.rl ;;
    (-code)       optCode=true ;;
    (-with-debug) optDebug=true ;;
    (-remove)     optRemove=true ;;

    (*) break ;;
    esac
    shift
done

#------------------------------------------------------------------------------

# Remove file, with feedback. $1 = file, $2 = message
removeFile() {
   if test -f "$1" && rm -f "$1" 2>/dev/null
   then
       echo "Removed generated $2 file"
   else
       echo "No generated $2 file to remove"
   fi
}


case "$scanner" in
(*.rl)
    input="${prefix}${scanner}"
    output="${prefix}${scanner%.*}.cc"

    if [ "$optRemove" = true ]
    then
        removeFile "$output"  "ragel scanner"
    elif command -v ragel >/dev/null
    then
        echo "Generating ragel scanner"
        ragel -G2 -o "$output" "$input"
    else
        echo "No ragel, leaving scanner intact"
    fi
    echo
    ;;
esac


case "$parser" in
(*.ly | *.lyy | *.ly*m4)
    extCode=cc
    input="${prefix}${parser}"
    output="${parser%.*}.h"

    # Pass -with-debug to wrap-lemon
    [ -n "$optDebug" ] && optDebug="-with-debug"

    # Additional message (eg, using m4 etc)
    unset message
    case "$parser" in (*m4) message=", using m4 filtering" ;; esac

    if [ "$optRemove" = true ]
    then
        removeFile "$output"  "lemon header"
    elif [ "$optCode" = true ]
    then
        echo "Generating lemon parser code ($extCode)$message"
        "$WM_PROJECT_DIR/wmake/scripts/wrap-lemon" $optDebug -e"$extCode" -s "$input"
    else
        echo "Generating lemon parser header$message"
        "$WM_PROJECT_DIR/wmake/scripts/wrap-lemon" $optDebug -header -s "$input"
    fi
    echo
    ;;
esac

#------------------------------------------------------------------------------