/* Part of SWISH 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(swish_render_codes, [ term_rendering//3 % +Term, +Vars, +Options ]). :- use_module(library(option)). :- use_module(library(http/html_write)). :- use_module('../render'). :- register_renderer(codes, "Render a list of character codes"). /** SWISH code-list renderer Render lists of character codes as a `string` */ %% term_rendering(+Codes, +Vars, +Options)// % % Renders a list of character codes as a string. Options % processed: % % - min_length(+Integer) % Codes must be a list of at least Integer length. Default is % `3`. % - ellipsis(+Integer) % Write list as `bla bla ... bla` if longer than Integer. % Default is 30. % - partial(+Boolean) % It `true` (default), allow a partial list (ending in a % variable). % - charset(+Charset) % Set of characters to accept. Currently allows for % - ascii % Allow 32..126 % - iso_latin_1 % Allow 32..126 and 160..255 term_rendering(Codes, _Vars, Options) --> { is_code_list(Codes, Len, Options) }, ( { option(ellipsis(Ellipsis), Options, 30), Len > Ellipsis } -> { First is Ellipsis - 5, Skip is Len - 5, skip_first(Skip, Codes, Rest), phrase(put_n_codes(First, Codes), PrefixCodes), phrase(put_codes(Rest), PostfixCodes), string_codes(Prefix, PrefixCodes), string_codes(Postfix, PostfixCodes) }, html(span([ 'data-render'('Truncated list of codes as a string'), class('render-code-list'), title('Code list of length: '+Len) ], [ '`~s'-[Prefix], span(class('render-ellipsis'), ...), '~s`'-[Postfix] ])) ; { phrase(put_codes(Codes), TextCodes), string_codes(String, TextCodes) }, html(span([ 'data-render'('List of codes as a string'), class('render-code-list') ], '`~s`'-String)) ). skip_first(N, [_|T0], T) :- succ(N2, N), !, skip_first(N2, T0, T). skip_first(_, L, L). put_n_codes(N, [H|T]) --> { succ(N2, N) }, !, emit_code(H), put_n_codes(N2, T). put_n_codes(_, _) --> []. put_codes(Var) --> { var_or_numbered(Var) }, !, dcg_format('|~p', [Var]). put_codes([]) --> []. put_codes([H|T]) --> emit_code(H), put_codes(T). emit_code(0'\b) --> !, "\\b". emit_code(0'\r) --> !, "\\r". emit_code(0'\n) --> !, "\\n". emit_code(0'\t) --> !, "\\t". emit_code(C) --> [C]. dcg_format(Fmt, Args, List, Tail) :- format(codes(List, Tail), Fmt, Args). %% is_code_list(+Codes, -Length, +Options) is semidet. is_code_list(Codes, Length, Options) :- '$skip_list'(Length, Codes, Tail), code_list_tail(Tail, Options), option(min_length(MinLen), Options, 3), Length >= MinLen, option(charset(Charset), Options, ascii), all_codes(Codes, Charset). code_list_tail([], _) :- !. code_list_tail(Var, Options) :- var_or_numbered(Var), option(partial(true), Options, true). var_or_numbered(Var) :- var(Var), !. var_or_numbered('$VAR'(_)). all_codes(Var, _) :- var_or_numbered(Var), !. all_codes([], _). all_codes([H|T], Charset) :- integer(H), is_code(H, Charset), !, all_codes(T, Charset). is_code(9, _). is_code(10, _). is_code(13, _). is_code(C, Charset) :- charset_code(Charset, C). charset_code(ascii, C) :- between(32,126,C). charset_code(iso_latin_1, C) :- between(32,126,C) ; between(160,255,C).