author | wenzelm |
Fri, 31 Aug 2018 22:25:58 +0200 | |
changeset 68865 | dd44e31ca2c6 |
parent 65933 | f3e4f9e6c485 |
child 69207 | ae2074acbaa8 |
permissions | -rw-r--r-- |
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(* Title: Pure/ML/ml_syntax.ML |
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Author: Makarius |
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Concrete ML syntax for basic values. |
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*) |
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signature ML_SYNTAX = |
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sig |
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val reserved_names: string list |
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val reserved: Name.context |
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val is_reserved: string -> bool |
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val is_identifier: string -> bool |
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val atomic: string -> string |
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val print_int: int -> string |
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val print_pair: ('a -> string) -> ('b -> string) -> 'a * 'b -> string |
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val print_list: ('a -> string) -> 'a list -> string |
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val print_option: ('a -> string) -> 'a option -> string |
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val print_char: string -> string |
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val print_string: string -> string |
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val print_strings: string list -> string |
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val print_properties: Properties.T -> string |
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val print_position: Position.T -> string |
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val print_range: Position.range -> string |
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val make_binding: string * Position.T -> string |
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val print_indexname: indexname -> string |
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val print_class: class -> string |
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val print_sort: sort -> string |
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val print_typ: typ -> string |
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val print_term: term -> string |
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val pretty_string: int -> string -> Pretty.T |
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end; |
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structure ML_Syntax: ML_SYNTAX = |
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struct |
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(* reserved words *) |
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val reserved_names = filter Symbol.is_ascii_identifier ML_Lex.keywords; |
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val reserved = Name.make_context reserved_names; |
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val is_reserved = Name.is_declared reserved; |
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(* identifiers *) |
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fun is_identifier name = |
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not (is_reserved name) andalso Symbol.is_ascii_identifier name; |
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(* literal output -- unformatted *) |
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val atomic = enclose "(" ")"; |
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val print_int = string_of_int; |
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fun print_pair f1 f2 (x, y) = "(" ^ f1 x ^ ", " ^ f2 y ^ ")"; |
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fun print_list f = enclose "[" "]" o commas o map f; |
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fun print_option f NONE = "NONE" |
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| print_option f (SOME x) = "SOME (" ^ f x ^ ")"; |
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fun print_chr s = |
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if Symbol.is_char s then |
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(case ord s of |
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34 => "\\\"" |
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| 92 => "\\\\" |
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| 7 => "\\a" |
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| 8 => "\\b" |
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| 9 => "\\t" |
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| 10 => "\\n" |
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| 11 => "\\v" |
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| 12 => "\\f" |
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| 13 => "\\r" |
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| c => |
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if c < 32 then "\\^" ^ chr (c + 64) |
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else if c < 127 then s |
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else "\\" ^ string_of_int c) |
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else error ("Bad character: " ^ quote s); |
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fun print_char s = |
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if Symbol.is_char s then print_chr s |
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else if Symbol.is_utf8 s then translate_string print_chr s |
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else s; |
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val print_string = quote o implode o map print_char o Symbol.explode; |
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val print_strings = print_list print_string; |
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val print_properties = print_list (print_pair print_string print_string); |
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more position information, e.g. relevant for errors in generated ML source;
wenzelm
parents:
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parents:
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fun print_position pos = |
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"Position.of_properties " ^ print_properties (Position.properties_of pos); |
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parents:
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fun print_range range = |
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"Position.range_of_properties " ^ print_properties (Position.properties_of_range range); |
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more position information, e.g. relevant for errors in generated ML source;
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parents:
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parents:
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fun make_binding (name, pos) = |
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"Binding.make " ^ print_pair print_string print_position (name, pos); |
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val print_indexname = print_pair print_string print_int; |
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val print_class = print_string; |
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val print_sort = print_list print_class; |
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more robust machine-generated ML sources: constructors for typ and term sometimes occur elsewhere;
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fun print_typ (Type arg) = "Term.Type " ^ print_pair print_string (print_list print_typ) arg |
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| print_typ (TFree arg) = "Term.TFree " ^ print_pair print_string print_sort arg |
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| print_typ (TVar arg) = "Term.TVar " ^ print_pair print_indexname print_sort arg; |
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|
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more robust machine-generated ML sources: constructors for typ and term sometimes occur elsewhere;
wenzelm
parents:
50238
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fun print_term (Const arg) = "Term.Const " ^ print_pair print_string print_typ arg |
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more robust machine-generated ML sources: constructors for typ and term sometimes occur elsewhere;
wenzelm
parents:
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| print_term (Free arg) = "Term.Free " ^ print_pair print_string print_typ arg |
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wenzelm
parents:
50238
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| print_term (Var arg) = "Term.Var " ^ print_pair print_indexname print_typ arg |
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parents:
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| print_term (Bound i) = "Term.Bound " ^ print_int i |
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| print_term (Abs (s, T, t)) = |
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parents:
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"Term.Abs (" ^ print_string s ^ ", " ^ print_typ T ^ ", " ^ print_term t ^ ")" |
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parents:
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| print_term (t1 $ t2) = "Term.$ " ^ print_pair print_term print_term (t1, t2); |
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|
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75de61a479e3
ML pretty printing of type string according to (quasi-abstract) YXML markup and symbols (including UTF8);
wenzelm
parents:
31543
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changeset
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(* toplevel pretty printing *) |
75de61a479e3
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wenzelm
parents:
31543
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changeset
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wenzelm
parents:
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diff
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fun pretty_string max_len str = |
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let |
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val body = |
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maps (fn XML.Elem _ => ["<markup>"] | XML.Text s => Symbol.explode s) (YXML.parse_body str) |
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parents:
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handle Fail _ => Symbol.explode str; |
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wenzelm
parents:
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val body' = |
23533273220a
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if length body <= max_len then body |
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else take (Int.max (max_len, 0)) body @ ["..."]; |
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parents:
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diff
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in Pretty.str (quote (implode (map print_char body'))) end; |
37535
75de61a479e3
ML pretty printing of type string according to (quasi-abstract) YXML markup and symbols (including UTF8);
wenzelm
parents:
31543
diff
changeset
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val _ = |
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careful export of type-dependent functions, without losing their special status;
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ML_system_pp (fn depth => fn _ => fn str => |
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Pretty.to_polyml (pretty_string (FixedInt.toInt (depth * 100)) str)); |
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end; |