#! /bin/bash
#
# Copyright by The HDF Group.
# All rights reserved.
#
# This file is part of HDF5.  The full HDF5 copyright notice, including
# terms governing use, modification, and redistribution, is contained in
# the COPYING file, which can be found at the root of the source code
# distribution tree, or in https://www.hdfgroup.org/licenses.
# If you do not have access to either file, you may request a copy from
# help@hdfgroup.org.
#

# This script runs flex/lex and bison/yacc to generate parser code for
# the high-level library. It used to be a part of autogen.sh, but many
# people encountered problems with installing flex and bison on their
# system and the parser code rarely changes, so those parts of the
# script were moved to their own file.
#
# NOTE CAREFULLY!
#
# There is NO dependency in either the autotools or CMake to regenerate
# the parser code. If you modify H5LT analyze.l or H5LTparse.y, you
# will need to run this script manually on a system with a suitable
# lexer and parser generator.
#
# IMPORTANT OS X NOTE
#
# If you are using OS X, you will probably not have flex or bison
# installed. In addition, even if you do have bison installed, the bison
# version you have installed may also have a bug that makes it unable to
# process our input files.
#
# The easiest way to fix this is to install everything via Homebrew:
#
#   http://brew.sh/
#
# After you install the base packages, install flex/bison.
#
#   brew install flex
#   brew install bison
#
# END IMPORTANT OS X NOTE
#
# If you want to use a particular version of flex or bison, the paths
# to each tool can be overridden using the following environment
# variables:
#
#   HDF5_FLEX
#   HDF5_BISON
#
# This script takes two potential options:
#
# -p
#
# When this is selected, the flex/bison versions are set to the paths
# and versions used by The HDF Group to produce the released versions
# of the library.
#
# NOTE: This is probably temporary. Once we update our dev machines
# to have recent versions of the autotools this option will probably
# be removed.
#
# -v
#
# This emits some extra information, mainly tool versions.

echo
echo "*******************************************"
echo "* HDF5 high-level parser generator script *"
echo "*******************************************"
echo

# Default is not verbose output
verbose=false

optspec=":hpv-"
while getopts "$optspec" optchar; do
    case "${optchar}" in
    h)
        echo "usage: $0 [OPTIONS] /path/to/hl/src/directory"
        echo
        echo "      -h      Print this help message."
        echo
        echo "      -p      Used by THG to use hard-codes flex/bison"
        echo "              paths on THG machines. Not for non-HDF-Group"
        echo "              users!"
        echo
        echo "      -v      Show more verbose output."
        echo
        echo "  NOTE: Each tool can be set via an environment variable."
        echo "        These are documented inside this script."
        echo
        exit 0
        ;;
    p)
        echo "Setting THG production mode..."
        echo
        production=true
        ;;
    v)
        echo "Setting verbosity: high"
        echo
        verbose=true
        ;;
    *)
        if [ "$OPTERR" != 1 ] || [ "${optspec:0:1}" = ":" ]; then
            echo "Non-option argument: '-${OPTARG}'" >&2
        fi
        ;;
    esac
done

# Get the path to the hl src directory
shift $(($OPTIND - 1))
path_to_hl_src=$1
if test -z ${path_to_hl_src}; then
    echo "*** ERROR *** - Path to hl/src not set"
    echo "Please add the path to the hl/src directory as a parameter"
    echo "See $0 -h for more help."
    echo
    exit -1
fi

if [ "$production" = true ] ; then

    # Production mode
    #
    # Hard-code canonical HDF Group tool locations.

    # If paths to tools are not specified, assume they are
    # located in /usr/hdf/bin/AUTOTOOLS and set paths accordingly.
    if test -z ${HDF5_BISON}; then
        HDF5_BISON=/usr/hdf/bin/AUTOTOOLS/bison
    fi
    if test -z ${HDF5_FLEX}; then
        HDF5_FLEX=/usr/hdf/bin/AUTOTOOLS/flex
    fi

else

    # Not in production mode
    #
    # If paths to autotools are not specified, use whatever the system
    # has installed as the default. We use 'which <tool>' to
    # show exactly what's being used.
    if test -z ${HDF5_BISON}; then
        HDF5_BISON=$(which bison)
    fi
    if test -z ${HDF5_FLEX}; then
        HDF5_FLEX=$(which flex)
    fi

fi # production

# Make sure that these versions of the tools are in the path
BISON_DIR=`dirname ${HDF5_BISON}`
FLEX_DIR=`dirname ${HDF5_FLEX}`
PATH=${FLEX_DIR}:${BISON_DIR}:$PATH

# Run flex and bison
# automatically generates hl/src/H5LTanalyze.c and hl/src/H5LTparse.c
# Note that, as of Xcode 6.1 (2015), the default bison version on OS X
# is old enough to have the circular dependency bug. You'll have
# to install a later version of bison. See the OS X note at the top
# of this script.
echo
echo "Generating H5LT parser code (requires yacc/bison):"
echo "Generate hl/src/H5LTparse.c from hl/src/H5LTparse.y"
# HDF5_BISON is set via the environment or 'which bison', above
if test -z ${HDF5_BISON}; then
    echo
    echo "*************************"
    echo " ERROR - bison not found"
    echo "*************************"
    echo "bison is required to generate parser code in H5LT"
    echo
    exit 127
fi
if [ "$verbose" = true ] ; then
    ${HDF5_BISON} --version
fi
${HDF5_BISON} -pH5LTyy -o ${path_to_hl_src}/H5LTparse.c -d ${path_to_hl_src}/H5LTparse.y

echo
echo "Generating H5LT lexer code (requires lex/flex):"
echo "Generate hl/src/H5LTanalyze.c from hl/src/H5LTanalyze.l"
# HDF5_FLEX is set via the environment or 'which flex', above
if test -z ${HDF5_FLEX}; then
    echo
    echo "************************"
    echo " ERROR - flex not found"
    echo "************************"
    echo "flex is required to generate lexer code in H5LT"
    echo
    exit 127
fi
if [ "$verbose" = true ] ; then
    ${HDF5_FLEX} --version
fi
${HDF5_FLEX} --nounistd -PH5LTyy -o ${path_to_hl_src}/H5LTanalyze.c ${path_to_hl_src}/H5LTanalyze.l

# fix H5LTparse.c and H5LTlparse.h to declare H5LTyyparse return type as an
# hid_t instead of int.  Currently the generated function H5LTyyparse is
# generated with a return value of type int, which is a mapping to the
# flex yyparse function.  The return value in the HL library should be
# an hid_t.
# I propose to not use flex to generate this function, but for now I am
# adding a perl command to find and replace this function declaration in
# H5LTparse.c.
perl -0777 -pi -e 's/int yyparse/hid_t yyparse/igs' ${path_to_hl_src}/H5LTparse.c
perl -0777 -pi -e 's/int\nyyparse/hid_t\nyyparse/igs' ${path_to_hl_src}/H5LTparse.c
perl -0777 -pi -e 's/int H5LTyyparse/hid_t H5LTyyparse/igs' ${path_to_hl_src}/H5LTparse.c
perl -0777 -pi -e 's/int yyparse/hid_t yyparse/igs' ${path_to_hl_src}/H5LTparse.h
perl -0777 -pi -e 's/int\nyyparse/hid_t\nyyparse/igs' ${path_to_hl_src}/H5LTparse.h
perl -0777 -pi -e 's/int H5LTyyparse/hid_t H5LTyyparse/igs' ${path_to_hl_src}/H5LTparse.h

# Add code that disables warnings in the flex/bison-generated code.
#
# Note that the GCC pragmas did not exist until gcc 4.2. Earlier versions
# will simply ignore them, but we want to avoid those warnings.
#
# Note also that although clang defines __GNUC__, it doesn't support every
# warning that GCC does.
for f in ${path_to_hl_src}/H5LTparse.c ${path_to_hl_src}/H5LTanalyze.c
do
    echo '#if defined (__GNUC__)                                            ' >> tmp.out
    echo '#if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402                    ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wconversion"                     ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wimplicit-function-declaration"  ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wmissing-prototypes"             ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wnested-externs"                 ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wold-style-definition"           ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wredundant-decls"                ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wsign-compare"                   ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wsign-conversion"                ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wstrict-overflow"                ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wstrict-prototypes"              ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"           ' >> tmp.out
    echo '#if !defined (__clang__)                                          ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wlarger-than="                   ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wsuggest-attribute=const"        ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wsuggest-attribute=pure"         ' >> tmp.out
    echo '#endif                                                            ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wswitch-default"                 ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wunused-function"                ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wunused-macros"                  ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wunused-parameter"               ' >> tmp.out
    echo '#endif                                                            ' >> tmp.out
    echo '#if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 600                    ' >> tmp.out
    echo '#pragma GCC diagnostic ignored "-Wnull-dereference"               ' >> tmp.out
    echo '#endif                                                            ' >> tmp.out
    echo '#elif defined __SUNPRO_CC                                         ' >> tmp.out
    echo '#pragma disable_warn                                              ' >> tmp.out
    echo '#elif defined _MSC_VER                                            ' >> tmp.out
    echo '#pragma warning(push, 1)                                          ' >> tmp.out
    echo '#endif                                                            ' >> tmp.out

    cat $f >> tmp.out
    mv tmp.out $f
done

echo
exit 0