src/Tools/WWW_Find/html_unicode.ML

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/WWW_Find/html_unicode.ML	Fri Nov 20 18:36:44 2009 +1100
@@ -0,0 +1,85 @@
+(*  Title:      html_unicode.ML
+    Author:     Timothy Bourke, NICTA
+                Based on Pure/Thy/html.ML
+                by Markus Wenzel and Stefan Berghofer, TU Muenchen
+
+HTML presentation elements that use unicode code points.
+*)
+
+signature HTML_UNICODE =
+sig
+  val print_mode: ('a -> 'b) -> 'a -> 'b
+end;
+
+structure HTML_Unicode: HTML_UNICODE =
+struct
+
+(** HTML print modes **)
+
+(* mode *)
+
+val htmlunicodeN = "HTMLUnicode";
+fun print_mode f x = PrintMode.with_modes [htmlunicodeN, Symbol.xsymbolsN] f x;
+
+(* symbol output *)
+
+local
+  val sym_width_lookup = Symtab.make
+   [("\<spacespace>", 2),
+    ("\<Longleftarrow>", 2),
+    ("\<longleftarrow>", 2),
+    ("\<Longrightarrow>", 2),
+    ("\<longrightarrow>", 2),
+    ("\<longleftrightarrow>", 2),
+    ("\<^bsub>", 0),
+    ("\<^esub>", 0),
+    ("\<^bsup>", 0),
+    ("\<^esup>", 0)];
+
+  fun sym_width s =
+    (case Symtab.lookup sym_width_lookup s of
+       NONE => 1
+     | SOME w => w);
+
+  fun output_sym s =
+    if Symbol.is_raw s then (1, Symbol.decode_raw s)
+    else
+      (case UnicodeSymbols.symbol_to_unicode s of
+         SOME x => (sym_width s, "&#" ^ Int.toString x ^ ";") (* numeric entities *)
+         (* SOME x => (sym_width s, UnicodeSymbols.utf8 [x])     (* utf-8 *) *)
+       | NONE => (size s, XML.text s));
+
+  fun output_sub s = apsnd (enclose "<sub>" "</sub>") (output_sym s);
+  fun output_sup s = apsnd (enclose "<sup>" "</sup>") (output_sym s);
+  fun output_loc s = apsnd (enclose "<span class=\"loc\">" "</span>") (output_sym s);
+
+  fun output_syms ("\<^sub>" :: s :: ss) = output_sub s :: output_syms ss
+    | output_syms ("\<^isub>" :: s :: ss) = output_sub s :: output_syms ss
+    | output_syms ("\<^sup>" :: s :: ss) = output_sup s :: output_syms ss
+    | output_syms ("\<^isup>" :: s :: ss) = output_sup s :: output_syms ss
+    | output_syms ("\<^loc>" :: s :: ss) = output_loc s :: output_syms ss
+    | output_syms (s :: ss) = output_sym s :: output_syms ss
+    | output_syms [] = [];
+
+  fun output_width str =
+    if not (exists_string (fn s => s = "\\" orelse s = "<" orelse s = ">" orelse s = "&") str)
+    then Output.default_output str
+    else
+      let val (syms, width) = fold_map (fn (w, s) => fn width => (s, w + width))
+        (output_syms (Symbol.explode str)) 0
+      in (implode syms, width) end;
+in
+
+val output = #1 o output_width;
+
+val _ = Output.add_mode htmlunicodeN output_width Symbol.encode_raw;
+
+end;
+
+(* common markup *)
+
+fun span s = ("<span class=" ^ quote (XML.text s) ^ ">", "</span>");
+
+val _ = Markup.add_mode htmlunicodeN (fn (name, _) => span name);
+
+end;