# Relational pipes

# Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, version 3 of the License.

#

# 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. See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program. If not, see <http://www.gnu.org/licenses/>.

	local w0 w1 w2 w3

	COMPREPLY=()

	w0=${COMP_WORDS[COMP_CWORD]}

	w1=${COMP_WORDS[COMP_CWORD-1]}

	w2=${COMP_WORDS[COMP_CWORD-2]}

	w3=${COMP_WORDS[COMP_CWORD-3]}

	DATA_TYPE=(

		"string"

		"integer"

		"boolean"

	)

	BOOLEAN_VALUES=(

		"true"

		"false"

	)

	MODE=(

		"string"

		"boolean"

		"raw-xml"

		"line-number"

		"xpath"

	)

	# FIXME: user must type " and then press TAB otherwise the completion is broken due to the : colon

	#

	# can be fixed by global modification of environment variable:

	#	COMP_WORDBREAKS=${COMP_WORDBREAKS//:}

	# but it will affect other completions (where : is a separator)

	#

	# these functions should help:

	#	_get_comp_words_by_ref -n : cur

	#	__ltrim_colon_completions "$cur"

	# but was not working (despite w0 renamed to cur)

	XMLNS=(

		"tag:globalcode.info,2018:relpipe"

		"http://www.w3.org/1999/xhtml"

		"http://www.w3.org/2000/svg"

		"http://www.w3.org/2005/Atom"

		"http://docbook.org/ns/docbook"

	)

	# TODO: introspection: after moving to alt2xml the available options and their values should be provided by the parser

	PARSER_OPTIONS=(

		"root-name"

	);

	if   [[ "$w1" == "--relation"                      && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w1" == "--records"                       && "x$w0" == "x" ]];    then COMPREPLY=("'/'")

	elif [[ "$w1" == "--attribute"                     && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w2" == "--attribute"                                      ]];    then COMPREPLY=($(compgen -W "${DATA_TYPE[*]}" -- "$w0"))

	elif [[ "$w3" == "--attribute"                     && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w1" == "--namespace"                     && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w2" == "--namespace"                                      ]];    then COMPREPLY=($(compgen -W "${XMLNS[*]}" -- "$w0"))

	elif [[ "$w1" == "--xinclude"                                       ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))

	elif [[ "$w1" == "--mode"                                           ]];    then COMPREPLY=($(compgen -W "${MODE[*]}" -- "$w0"))

	elif [[ "$w1" == "--raw-xml-nodelist-wrapper"                       ]];    then COMPREPLY=("'xml'")

	elif [[ "$w2" == "--raw-xml-nodelist-wrapper"      && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w3" == "--raw-xml-nodelist-wrapper"      && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w1" == "--raw-xml-attribute-wrapper"                       ]];    then COMPREPLY=("'attribute'")

	elif [[ "$w2" == "--raw-xml-attribute-wrapper"      && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w3" == "--raw-xml-attribute-wrapper"      && "x$w0" == "x" ]];    then COMPREPLY=("''")

	elif [[ "$w1" == "--parser-option"                                   ]];    then COMPREPLY=($(compgen -W "${PARSER_OPTIONS[*]}" -- "$w0"))

	elif [[ "$w2" == "--parser-option"                  && "x$w0" == "x" ]];    then COMPREPLY=("''")

	else

		OPTIONS=(

			"--namespace"

			"--parser-option"

			"--relation"

			"--records"

			"--name-is-xpath"

			"--attribute"

			"--xinclude"

			"--mode"

			"--raw-xml-nodelist-wrapper"

			"--raw-xml-attribute-wrapper"

		)

		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))

	fi

}