/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org Copyright (c) 2014, VU University Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(term_html, [ term//2 % +Term, +Options ]). :- use_module(library(http/html_write)). :- use_module(library(option)). :- use_module(library(error)). :- use_module(library(debug)). :- multifile blob_rendering//3. % +Type, +Blob, +Options /** Represent Prolog terms as HTML This file is primarily designed to support running Prolog applications over the web. It provides a replacement for write_term/2 which renders terms as structured HTML. */ %! term(@Term, +Options)// is det. % % Render a Prolog term as a structured HTML tree. Options are % passed to write_term/3. In addition, the following options are % processed: % % - float_format(+Format) % If a float is rendered, it is rendered using % `format(string(S), Format, [Float])`% % % @tbd Cyclic terms. % @tbd Attributed terms. % @tbd Portray % @tbd Test with Ulrich's write test set. % @tbd Deal with numbervars and canonical. term(Term, Options) --> { must_be(acyclic, Term), merge_options(Options, [ priority(1200), max_depth(1 000 000 000), depth(0) ], Options1), dict_create(Dict, _, Options1) }, any(Term, Dict). any(_, Options) --> { Options.depth >= Options.max_depth }, !, html(span(class('pl-ellipsis'), ...)). any(Term, Options) --> { primitive(Term, Class0), !, quote_atomic(Term, S, Options), primitive_class(Class0, Term, S, Class) }, html(span(class(Class), S)). any(Term, Options) --> { blob(Term,Type), Term \== [] }, !, ( blob_rendering(Type,Term,Options) -> [] ; html(span(class('pl-blob'),['<',Type,'>'])) ). any(Term, Options) --> { is_dict(Term), ! }, dict(Term, Options). any(Term, Options) --> { assertion((compound(Term);Term==[])) }, compound(Term, Options). %! compound(+Compound, +Options)// is det. % % Process a compound term. compound('$VAR'(Var), Options) --> { Options.get(numbervars) == true, !, format(string(S), '~W', ['$VAR'(Var), [numbervars(true)]]), ( S == "_" -> Class = 'pl-anon' ; Class = 'pl-var' ) }, html(span(class(Class), S)). compound(List, Options) --> { ( List == [] ; List = [_|_] % May have unbound tail ), !, arg_options(Options, ArgOptions) }, list(List, ArgOptions). compound({X}, Options) --> !, { arg_options(Options, _{priority:1200}, ArgOptions) }, html(span(class('pl-curl'), [ '{', \any(X, ArgOptions), '}' ])). compound(OpTerm, Options) --> { compound_name_arity(OpTerm, Name, 1), is_op1(Name, Type, Pri, ArgPri, Options), \+ Options.get(ignore_ops) == true }, !, op1(Type, Pri, OpTerm, ArgPri, Options). compound(OpTerm, Options) --> { compound_name_arity(OpTerm, Name, 2), is_op2(Name, LeftPri, Pri, RightPri, Options), \+ Options.get(ignore_ops) == true }, !, op2(Pri, OpTerm, LeftPri, RightPri, Options). compound(Compound, Options) --> { compound_name_arity(Compound, Name, Arity), quote_atomic(Name, S, Options.put(embrace, never)), arg_options(Options, _{priority:999}, ArgOptions), extra_classes(Classes, Options) }, html(span(class(['pl-compound'|Classes]), [ span(class('pl-functor'), S), '(', \args(0, Arity, Compound, ArgOptions), ')' ])). extra_classes(['pl-level-0'], Options) :- Options.depth == 0, !. extra_classes([], _). %! arg_options(+Options, -OptionsOut) is det. %! arg_options(+Options, +Extra, -OptionsOut) is det. % % Increment depth in Options. arg_options(Options, Options.put(depth, NewDepth)) :- NewDepth is Options.depth+1. arg_options(Options, Extra, Options.put(depth, NewDepth).put(Extra)) :- NewDepth is Options.depth+1. %! args(+Arg0, +Arity, +Compound, +Options)// % % Emit arguments of a compound term. args(Arity, Arity, _, _) --> !. args(I, Arity, Compound, ArgOptions) --> { NI is I + 1, arg(NI, Compound, Arg) }, any(Arg, ArgOptions), ( {NI == Arity} -> [] ; html(', '), args(NI, Arity, Compound, ArgOptions) ). %! list(+List, +Options)// % % Emit a list. The List may have an unbound tail. list(List, Options) --> html(span(class('pl-list'), ['[', \list_content(List, Options), ']' ])). list_content([], _Options) --> !, []. list_content([H|T], Options) --> !, { arg_options(Options, ArgOptions) }, any(H, Options), ( {T == []} -> [] ; { Options.depth + 1 >= Options.max_depth } -> html(['|',span(class('pl-ellipsis'), ...)]) ; {var(T) ; \+ T = [_|_]} -> html('|'), tail(T, ArgOptions) ; html(', '), list_content(T, ArgOptions) ). tail(Value, Options) --> { var(Value) -> Class = 'pl-var-tail' ; Class = 'pl-nonvar-tail' }, html(span(class(Class), \any(Value, Options))). %! is_op1(+Name, -Type, -Priority, -ArgPriority, +Options) is semidet. % % True if Name is an operator taking one argument of Type. is_op1(Name, Type, Pri, ArgPri, Options) :- operator_module(Module, Options), current_op(Pri, OpType, Module:Name), argpri(OpType, Type, Pri, ArgPri), !. argpri(fx, prefix, Pri0, Pri) :- Pri is Pri0 - 1. argpri(fy, prefix, Pri, Pri). argpri(xf, postfix, Pri0, Pri) :- Pri is Pri0 - 1. argpri(yf, postfix, Pri, Pri). %! is_op2(+Name, -LeftPri, -Pri, -RightPri, +Options) is semidet. % % True if Name is an operator taking two arguments of Type. is_op2(Name, LeftPri, Pri, RightPri, Options) :- operator_module(Module, Options), current_op(Pri, Type, Module:Name), infix_argpri(Type, LeftPri, Pri, RightPri), !. infix_argpri(xfx, ArgPri, Pri, ArgPri) :- ArgPri is Pri - 1. infix_argpri(yfx, Pri, Pri, ArgPri) :- ArgPri is Pri - 1. infix_argpri(xfy, ArgPri, Pri, Pri) :- ArgPri is Pri - 1. %! operator_module(-Module, +Options) is det. % % Find the module for evaluating operators. operator_module(Module, Options) :- Module = Options.get(module), !. operator_module(TypeIn, _) :- '$module'(TypeIn, TypeIn). %! op1(+Type, +Pri, +Term, +ArgPri, +Options)// is det. op1(Type, Pri, Term, ArgPri, Options) --> { Pri > Options.priority }, !, html(['(', \op1(Type, Term, ArgPri, Options), ')']). op1(Type, _, Term, ArgPri, Options) --> op1(Type, Term, ArgPri, Options). op1(prefix, Term, ArgPri, Options) --> { Term =.. [Functor,Arg], arg_options(Options, DepthOptions), FuncOptions = DepthOptions.put(embrace, never), ArgOptions = DepthOptions.put(priority, ArgPri), quote_atomic(Functor, S, FuncOptions), extra_classes(Classes, Options) }, html(span(class(['pl-compound'|Classes]), [ span(class('pl-prefix'), S), \space(Functor, Arg, FuncOptions, ArgOptions), \any(Arg, ArgOptions) ])). op1(postfix, Term, ArgPri, Options) --> { Term =.. [Functor,Arg], arg_options(Options, DepthOptions), ArgOptions = DepthOptions.put(priority, ArgPri), FuncOptions = DepthOptions.put(embrace, never), quote_atomic(Functor, S, FuncOptions), extra_classes(Classes, Options) }, html(span(class(['pl-compound'|Classes]), [ \any(Arg, ArgOptions), \space(Arg, Functor, ArgOptions, FuncOptions), span(class('pl-postfix'), S) ])). %! op2(+Pri, +Term, +LeftPri, +RightPri, +Options)// is det. op2(Pri, Term, LeftPri, RightPri, Options) --> { Pri > Options.priority }, !, html(['(', \op2(Term, LeftPri, RightPri, Options), ')']). op2(_, Term, LeftPri, RightPri, Options) --> op2(Term, LeftPri, RightPri, Options). op2(Term, LeftPri, RightPri, Options) --> { Term =.. [Functor,Left,Right], arg_options(Options, DepthOptions), LeftOptions = DepthOptions.put(priority, LeftPri), FuncOptions = DepthOptions.put(embrace, never), RightOptions = DepthOptions.put(priority, RightPri), ( ( need_space(Left, Functor, LeftOptions, FuncOptions) ; need_space(Functor, Right, FuncOptions, RightOptions) ) -> Space = ' ' ; Space = '' ), quote_op(Functor, S, Options), extra_classes(Classes, Options) }, html(span(class(['pl-compound'|Classes]), [ \any(Left, LeftOptions), Space, span(class('pl-infix'), S), Space, \any(Right, RightOptions) ])). %! space(@T1, @T2, +Options)// % % Emit a space if omitting a space between T1 and T2 would cause % the two terms to join. space(T1, T2, LeftOptions, RightOptions) --> { need_space(T1, T2, LeftOptions, RightOptions) }, html(' '). space(_, _, _, _) --> []. need_space(T1, T2, _, _) :- ( is_solo(T1) ; is_solo(T2) ), !, fail. need_space(T1, T2, LeftOptions, RightOptions) :- end_code_type(T1, TypeR, LeftOptions.put(side, right)), end_code_type(T2, TypeL, RightOptions.put(side, left)), \+ no_space(TypeR, TypeL). no_space(punct, _). no_space(_, punct). no_space(quote(R), quote(L)) :- !, R \== L. no_space(alnum, symbol). no_space(symbol, alnum). %! end_code_type(+Term, -Code, Options) % % True when code is the first/last character code that is emitted % by printing Term using Options. end_code_type(_, Type, Options) :- Options.depth >= Options.max_depth, !, Type = symbol. end_code_type(Term, Type, Options) :- primitive(Term, _), !, quote_atomic(Term, S, Options), end_type(S, Type, Options). end_code_type(Dict, Type, Options) :- is_dict(Dict, Tag), !, ( Options.side == left -> end_code_type(Tag, Type, Options) ; Type = punct ). end_code_type('$VAR'(Var), Type, Options) :- Options.get(numbervars) == true, !, format(string(S), '~W', ['$VAR'(Var), [numbervars(true)]]), end_type(S, Type, Options). end_code_type(List, Type, _) :- ( List == [] ; List = [_|_] ), !, Type = punct. end_code_type(OpTerm, Type, Options) :- compound_name_arity(OpTerm, Name, 1), is_op1(Name, Type, Pri, ArgPri, Options), \+ Options.get(ignore_ops) == true, !, ( Pri > Options.priority -> Type = punct ; ( Type == prefix -> end_code_type(Name, Type, Options) ; arg(1, OpTerm, Arg), arg_options(Options, ArgOptions), end_code_type(Arg, Type, ArgOptions.put(priority, ArgPri)) ) ). end_code_type(OpTerm, Type, Options) :- compound_name_arity(OpTerm, Name, 2), is_op2(Name, LeftPri, Pri, _RightPri, Options), \+ Options.get(ignore_ops) == true, !, ( Pri > Options.priority -> Type = punct ; arg(1, OpTerm, Arg), arg_options(Options, ArgOptions), end_code_type(Arg, Type, ArgOptions.put(priority, LeftPri)) ). end_code_type(Compound, Type, Options) :- compound_name_arity(Compound, Name, _), end_code_type(Name, Type, Options). end_type(S, Type, _Options) :- number(S), !, Type = alnum. end_type(S, Type, Options) :- Options.side == left, !, sub_string(S, 0, 1, _, Start), syntax_type(Start, Type). end_type(S, Type, _) :- sub_string(S, _, 1, 0, End), syntax_type(End, Type). syntax_type("\"", quote(double)) :- !. syntax_type("\'", quote(single)) :- !. syntax_type("\`", quote(back)) :- !. syntax_type(S, Type) :- string_code(1, S, C), ( code_type(C, prolog_identifier_continue) -> Type = alnum ; code_type(C, prolog_symbol) -> Type = symbol ; code_type(C, space) -> Type = layout ; Type = punct ). %! dict(+Term, +Options)// dict(Term, Options) --> { dict_pairs(Term, Tag, Pairs), quote_atomic(Tag, S, Options.put(embrace, never)), arg_options(Options, ArgOptions) }, html(span(class('pl-dict'), [ span(class('pl-tag'), S), '{', \dict_kvs(Pairs, ArgOptions), '}' ])). dict_kvs([], _) --> []. dict_kvs(_, Options) --> { Options.depth >= Options.max_depth }, !, html(span(class('pl-ellipsis'), ...)). dict_kvs(KVs, Options) --> dict_kvs2(KVs, Options). dict_kvs2([K-V|T], Options) --> { quote_atomic(K, S, Options), end_code_type(V, VType, Options.put(side, left)), ( VType == symbol -> VSpace = ' ' ; VSpace = '' ), arg_options(Options, ArgOptions) }, html([ span(class('pl-key'), S), ':', % FIXME: spacing VSpace, \any(V, ArgOptions) ]), ( {T==[]} -> [] ; html(', '), dict_kvs2(T, Options) ). quote_atomic(Float, String, Options) :- float(Float), Format = Options.get(float_format), !, format(string(String), Format, [Float]). quote_atomic(Plain, Plain, _) :- number(Plain), !. quote_atomic(Plain, String, Options) :- Options.get(quoted) == true, !, ( Options.get(embrace) == never -> format(string(String), '~q', [Plain]) ; format(string(String), '~W', [Plain, Options]) ). quote_atomic(Var, String, Options) :- var(Var), !, format(string(String), '~W', [Var, Options]). quote_atomic(Plain, Plain, _). quote_op(Op, S, _Options) :- is_solo(Op), !, S = Op. quote_op(Op, S, Options) :- quote_atomic(Op, S, Options.put(embrace,never)). is_solo(Var) :- var(Var), !, fail. is_solo(','). is_solo(';'). is_solo('!'). %! primitive(+Term, -Class) is semidet. % % True if Term is a primitive term, rendered using the CSS % class Class. primitive(Term, Type) :- var(Term), !, Type = 'pl-avar'. primitive(Term, Type) :- atom(Term), !, Type = 'pl-atom'. primitive(Term, Type) :- string(Term), !, Type = 'pl-string'. primitive(Term, Type) :- integer(Term), !, Type = 'pl-int'. primitive(Term, Type) :- float(Term), !, Type = 'pl-float'. %! primitive_class(+Class0, +Value, -String, -Class) is det. % % Fixup the CSS class for lexical variations. Used to find % quoted atoms. primitive_class('pl-atom', Atom, String, Class) :- \+ atom_string(Atom, String), !, Class = 'pl-quoted-atom'. primitive_class(Class, _, _, Class). /******************************* * HOOKS * *******************************/ %! blob_rendering(+BlobType, +Blob, +WriteOptions)// is semidet. % % Hook to render blob atoms as HTML. This hook is called whenever % a blob atom is encountered while rendering a compound term as % HTML. The blob type is provided to allow efficient indexing % without having to examine the blob. If this predicate fails, the % blob is rendered as an HTML SPAN with class 'pl-blob' containing % BlobType as text. :- multifile blob_rendering//3.