<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE language SYSTEM "language.dtd">

<language name="Logtalk" version="1.51" kateversion="2.4" section="Sources" extensions="*.lgt;*.config" mimetype="text/x-logtalk" author="Paulo Moura (pmoura@logtalk.org)" license="Artistic License 2.0">

	<highlighting>

		<contexts>

			<context name = "normal" attribute = "Normal" lineEndContext = "#stay" >
				<!-- Directives -->
				<RegExpr String = "^\s*:-" attribute = "Normal" context = "directive" />
				<!-- Event handlers -->
				<RegExpr String = "\b(after|before)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Method execution context -->
				<RegExpr String = "\b(parameter|this|se(lf|nder))(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Reflection -->
				<RegExpr String = "\b(current_predicate|predicate_property)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- DCGs -->
				<RegExpr String = "\b(expand_term|term_expansion|phrase)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Entity -->
				<RegExpr String = "\b(abolish|c(reate|urrent))_(object|protocol|category)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(object|protocol|category)_property(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Entity relations -->
				<RegExpr String = "\bextends_(object|protocol)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bimplements_protocol(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(instantiates|specializes)_class(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bimports_category(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Events -->
				<RegExpr String = "\b(current_event|(abolish|define)_events)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Flags -->
				<RegExpr String = "\b(current|set)_logtalk_flag(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Compiling, loading, and library paths -->
				<RegExpr String = "\blogtalk_(compile|l(ibrary_path|oad))(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Database -->
				<RegExpr String = "\b(clause|retract(all)?)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\ba(bolish|ssert(a|z))(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Control -->
				<RegExpr String = "\b(ca(ll|tch)|throw)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(fail|true)\b" attribute = "Built-in" context = "#stay" />
				<!-- All solutions -->
				<RegExpr String = "\b((bag|set)of|f(ind|or)all)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Term unification -->
				<RegExpr String = "\bunify_with_occurs_check(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Term creation and decomposition -->
				<RegExpr String = "\b(functor|arg|copy_term)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Evaluable functors -->
				<RegExpr String = "\b(rem|mod|abs|sign)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bfloat(_(integer|fractional)_part)?(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(floor|truncate|round|ceiling)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Other arithmetic functors -->
				<RegExpr String = "\b(cos|atan|exp|log|s(in|qrt))(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Term testing -->
				<RegExpr String = "\b(var|atom(ic)?|integer|float|compound|n(onvar|umber))(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Stream selection and control -->
				<RegExpr String = "\b(current|set)_(in|out)put(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(open|close)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bflush_output(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bflush_output\b" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(stream_property|at_end_of_stream|set_stream_position)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Character and byte input/output -->
				<RegExpr String = "\b(nl|(get|peek|put)_(byte|c(har|ode)))(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bnl\b" attribute = "Built-in" context = "#stay" />
				<!-- Term input/output -->
				<RegExpr String = "\bread(_term)?(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bwrite(q|_(canonical|term))?(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(current_)?op(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(current_)?char_conversion(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Atomic term processing -->
				<RegExpr String = "\batom_(length|c(hars|o(ncat|des)))(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\b(char_code|sub_atom)(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bnumber_c(hars|odes)(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Implementation defined hooks functions -->
				<RegExpr String = "\b(set|current)_prolog_flag(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bhalt\b" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\bhalt(?=[(])" attribute = "Built-in" context = "#stay" />
				<!-- Variables -->
				<RegExpr String = "\b[A-Z_]\w*" attribute = "Variable" context = "#stay" />
				<!-- Comments -->
				<DetectChar char = "%" attribute = "Comment" context = "single line comment" />
				<Detect2Chars char = "/" char1 = "*" attribute = "Comment" context = "multiline comment" beginRegion = "Comment" />
				<!-- Strings and quoted atoms -->
				<DetectChar char = "&quot;" attribute = "String" context = "string" />
				<DetectChar char = "'" attribute = "String" context = "atom" />
				<!-- Numbers -->
				<RegExpr String = "0'." attribute = "Number" context = "#stay" />
				<RegExpr String = "0b[0-1]+" attribute = "Number" context = "#stay" />
				<RegExpr String = "0o[0-7]+" attribute = "Number" context = "#stay" />
				<RegExpr String = "0x[0-9a-fA-F]+" attribute = "Number" context = "#stay" />
				<RegExpr String = "\d+(\.\d+)?([eE]([-+])?\d+)?" attribute = "Number" context = "#stay" />
				<!-- Message sending operators -->
				<Detect2Chars char = ":" char1 = ":" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "^" char1 = "^" attribute = "Operator" context = "#stay" />
				<!-- External call -->
				<DetectChar char = "{" attribute = "Operator" context = "#stay" beginRegion="external" />
				<DetectChar char = "}" attribute = "Operator" context = "#stay" endRegion="external" />
				<!-- Logic and control -->
				<RegExpr String = "\bonce(?=[(])" attribute = "Built-in" context = "#stay" />
				<RegExpr String = "\brepeat\b" attribute = "Built-in" context = "#stay" />
				<!-- Bitwise functors -->
				<Detect2Chars char = "&gt;" char1 = "&gt;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "&lt;" char1 = "&lt;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "/" char1 = "\" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "\" char1 = "/" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "\" char1 = "\" attribute = "Operator" context = "#stay" />
				<!-- Arithemtic evaluation -->
				<RegExpr String = "\bis\b" attribute = "Operator" context = "#stay" />
				<!-- Arithemtic comparison -->
				<StringDetect String = "=:=" attribute = "Operator" context = "#stay" />
				<StringDetect String = "=\=" attribute = "Operator" context = "#stay" />
				<DetectChar char = "&lt;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "=" char1 = "&lt;" attribute = "Operator" context = "#stay" />
				<DetectChar char = "&gt;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "&gt;" char1 = "=" attribute = "Operator" context = "#stay" />
				<!-- Term creation and decomposition -->
				<StringDetect String = "=.." attribute = "Operator" context = "#stay" />
				<!-- Term unification -->
				<DetectChar char = "=" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "\" char1 = "=" attribute = "Operator" context = "#stay" />
				<!-- Term comparison -->
				<Detect2Chars char = "=" char1 = "=" attribute = "Operator" context = "#stay" />
				<StringDetect String = "\==" attribute = "Operator" context = "#stay" />
				<StringDetect String = "@=&lt;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "@" char1 = "&lt;" attribute = "Operator" context = "#stay" />
				<StringDetect String = "@&gt;=" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "@" char1 = "&gt;" attribute = "Operator" context = "#stay" />
				<!-- Evaluable functors -->
				<Detect2Chars char = "/" char1 = "/" attribute = "Operator" context = "#stay" />
				<AnyChar String = "+-*/" attribute = "Operator" context = "#stay" />
				<RegExpr String = "\b(mod|rem)\b" attribute = "Operator" context = "#stay" />
				<!-- Other arithemtic functors -->
				<Detect2Chars char = "*" char1 = "*" attribute = "Operator" context = "#stay" />
				<!-- DCG rules -->
				<StringDetect String = "--&gt;" attribute = "Operator" context = "#stay" />
				<!-- Control constructs -->
				<AnyChar String = "!;" attribute = "Operator" context = "#stay" />
				<Detect2Chars char = "-" char1 = "&gt;" attribute = "Operator" context = "#stay" />
				<!-- Logic and control -->
				<Detect2Chars char = "\" char1 = "+" attribute = "Operator" context = "#stay" />
				<!-- Mode operators -->
				<AnyChar String = "?@" attribute = "Operator" context = "#stay" />
				<!-- Clause operator -->
				<Detect2Chars char = ":" char1 = "-"  firstNonSpace = "false" attribute = "Normal" context = "#stay" />
				<!-- Atoms -->
				<RegExpr String = "\b[a-z]\w*" attribute = "Normal" context = "#stay" />
			</context>

			<context name = "directive" attribute = "Directive" lineEndContext = "#stay" >
				<!-- Entity directives -->
				<RegExpr String = "\b(category|object|protocol)(?=[(])" attribute = "Directive" context = "entityrelations" beginRegion = "Entity"/>
				<RegExpr String = "\bend_(category|object|protocol)[.]" attribute = "Directive" context = "#pop" endRegion = "Entity" />
				<RegExpr String = "\bmodule(?=[(])" attribute = "Directive" context = "#pop"/>
 				<!-- Predicate scope directives -->
				<RegExpr String = "\bp(ublic|r(otected|ivate))(?=[(])" attribute = "Directive" context = "#pop" />
				<!-- Other directives -->
				<RegExpr String = "\be(ncoding|xport)(?=[(])" attribute = "Directive" context = "#pop" />
			   	<RegExpr String = "\bin(fo|itialization)(?=[(])" attribute = "Directive" context = "#pop" />
				<RegExpr String = "\bdynamic[.]" attribute = "Directive" context = "#pop" />
				<RegExpr String = "\b(alias|d(ynamic|iscontiguous)|meta_predicate|m(etapredicate|ode|ultifile))(?=[(])" attribute = "Directive" context = "#pop" />
				<RegExpr String = "\bop(?=[(])" attribute = "Directive" context = "#pop" />
				<RegExpr String = "\b(calls|use(s|_module))(?=[(])" attribute = "Directive" context = "#pop" />
			</context>

			<context name = "entityrelations" attribute = "Normal" lineEndContext = "#stay" >
				<RegExpr String = "\b(extends|i(nstantiates|mp(lements|orts))|specializes)(?=[(])" attribute = "Directive" context = "#stay" />
				<Detect2Chars attribute = "Normal" context = "normal" char = ")" char1 = "." />
			</context>

			<context name = "single line comment" attribute = "Comment" lineEndContext = "#pop" />

			<context name = "multiline comment" attribute = "Comment" lineEndContext = "#stay" >
				<Detect2Chars char = "*" char1 = "/" attribute = "Comment" context = "#pop" endRegion = "Comment" />
			</context>

			<context name = "string" attribute = "String" lineEndContext = "#stay" >
				<DetectChar char = "&quot;" attribute = "String" context = "#pop" />
			</context>

			<context name = "atom" attribute = "String" lineEndContext = "#stay" >
				<DetectChar char = "'" attribute = "String" context = "#pop" />
			</context>

		</contexts>

		<itemDatas>
			<itemData name = "Normal" defStyleNum = "dsNormal" />
			<itemData name = "Directive" defStyleNum = "dsKeyword" />
			<itemData name = "Built-in" defStyleNum = "dsKeyword" />
			<itemData name = "Operator" defStyleNum = "dsDataType" />
			<itemData name = "Comment" defStyleNum = "dsComment" />
			<itemData name = "Number" defStyleNum = "dsDecVal" />
			<itemData name = "String"  defStyleNum = "dsString" />
			<itemData name = "Variable" defStyleNum = "dsOthers" />
		</itemDatas>

	</highlighting>

	<general>
		<comments>
			<comment name = "singleLine" start = "%" />
			<comment name = "multiLine" start = "/*" end = "*/" region = "Comment" />
		</comments>
		<keywords casesensitive="true" />
	</general>

</language>
