#!/bin/sh

set -e
cd "${0%/*}/../.."
exec >lib/unicode/prop/uprop_get_gcb.c

gawk '
BEGIN {
	FS = "( *#.*| *; +)"

	map["Control"]            = "CN"
	map["CR"]                 = "CR"
	map["E_Base"]             = "EB"
	map["E_Base_GAZ"]         = "EBG"
	map["E_Modifier"]         = "EM"
	map["Extend"]             = "EX"
	map["Glue_After_Zwj"]     = "GAZ"
	map["LF"]                 = "LF"
	map["L"]                  = "L"
	map["LV"]                 = "LV"
	map["LVT"]                = "LVT"
	map["Other"]              = "XX"
	map["Prepend"]            = "PP"
	map["Regional_Indicator"] = "RI"
	map["SpacingMark"]        = "SM"
	map["T"]                  = "T"
	map["V"]                  = "V"
	map["ZWJ"]                = "ZWJ"

	print "/* This file is autogenerated by gen/prop/gcb; DO NOT EDIT. */"
	print ""
	print "#include \"_bsearch.h\""
	print "#include \"macros.h\""
	print "#include \"rune.h\""
	print "#include \"unicode/prop.h\""
	print ""
}

/^[^#]/ {
	n = split($1, a, /\.\./)
	lo = strtonum("0X" a[1])
	hi = strtonum("0X" a[n])

	for (i = lo; i <= hi; i++) {
		gsub(/^; /, "", $2)
		props[i] = "GCB_" map[$2]
	}
}

END {
	print "static constexpr enum uprop_gcb lookup_lat1[] = {"
	for (i = 0; i < 0x100; i++) {
		if (i % 8 == 0)
			printf "\t"
		printf "%-7s%s", (props[i] ? props[i] : "GCB_XX") ",", \
			i % 8 == 7 ? "\n" : " "
	}
	print "};"
	print ""
	print "static const struct {"
	print "\trune lo, hi;"
	print "\tenum uprop_gcb val;"
	print "} lookup[] = {"

	for (i = 0x100; i <= 0x10FFFF; i++) {
		if (!props[i])
			continue
		for (lo = i; props[lo] == props[i + 1]; i++)
			;
		printf "\t{RUNE_C(0x%06X), RUNE_C(0x%06X), %s},\n", lo, i, props[i]
	}

	print "};"
	print ""
	print "_MLIB_DEFINE_BSEARCH(enum uprop_gcb, lookup, GCB_XX)"
	print ""
	print "enum uprop_gcb"
	print "uprop_get_gcb(rune ch)"
	print "{"
	print "\treturn ch < lengthof(lookup_lat1) ? lookup_lat1[ch] : mlib_lookup(ch);"
	print "}"
}
' data/GraphemeBreakProperty | sed 's/\s*$//'