wenzelm@6118
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(* Title: Pure/General/pretty.ML
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wenzelm@6116
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ID: $Id$
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wenzelm@8806
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory
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wenzelm@10952
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Author: Markus Wenzel, TU Munich
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wenzelm@6116
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wenzelm@6116
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Generic pretty printing module.
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wenzelm@6116
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wenzelm@6116
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Loosely based on
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wenzelm@6116
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D. C. Oppen, "Pretty Printing",
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wenzelm@6116
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ACM Transactions on Programming Languages and Systems (1980), 465-483.
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wenzelm@6116
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wenzelm@6116
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The object to be printed is given as a tree with indentation and line
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wenzelm@6116
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breaking information. A "break" inserts a newline if the text until
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wenzelm@6116
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the next break is too long to fit on the current line. After the newline,
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wenzelm@6116
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text is indented to the level of the enclosing block. Normally, if a block
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wenzelm@6116
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is broken then all enclosing blocks will also be broken. Only "inconsistent
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wenzelm@6116
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breaks" are provided.
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wenzelm@6116
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wenzelm@6116
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The stored length of a block is used in breakdist (to treat each inner block as
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a unit for breaking).
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wenzelm@6116
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*)
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wenzelm@6116
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wenzelm@23660
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type pprint_args = (output -> unit) * (int -> unit) * (int -> unit) *
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wenzelm@6116
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(unit -> unit) * (unit -> unit);
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wenzelm@6116
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wenzelm@6116
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signature PRETTY =
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wenzelm@14832
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sig
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wenzelm@23660
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val default_indent: string -> int -> output
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wenzelm@23698
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val add_mode: string -> (string -> int -> output) -> unit
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wenzelm@6116
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type T
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val str: string -> T
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val brk: int -> T
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val fbrk: T
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val breaks: T list -> T list
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val fbreaks: T list -> T list
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wenzelm@23645
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val blk: int * T list -> T
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wenzelm@6116
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val block: T list -> T
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wenzelm@23645
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val strs: string list -> T
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wenzelm@23617
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val markup: Markup.T -> T list -> T
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wenzelm@26703
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val mark: Markup.T -> T -> T
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wenzelm@23617
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val keyword: string -> T
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wenzelm@23617
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val command: string -> T
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wenzelm@23638
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val markup_chunks: Markup.T -> T list -> T
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wenzelm@18802
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val chunks: T list -> T
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wenzelm@19266
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val chunks2: T list -> T
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wenzelm@23617
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val block_enclose: T * T -> T list -> T
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wenzelm@18802
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val quote: T -> T
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wenzelm@18802
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val backquote: T -> T
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wenzelm@18802
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val separate: string -> T list -> T list
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wenzelm@18802
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val commas: T list -> T list
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val enclose: string -> string -> T list -> T
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wenzelm@18802
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val enum: string -> string -> string -> T list -> T
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val list: string -> string -> T list -> T
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val str_list: string -> string -> string list -> T
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val big_list: string -> T list -> T
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wenzelm@9730
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val indent: int -> T -> T
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wenzelm@23645
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val unbreakable: T -> T
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wenzelm@23645
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val setmargin: int -> unit
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wenzelm@23645
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val setmp_margin: int -> ('a -> 'b) -> 'a -> 'b
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wenzelm@23645
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val setdepth: int -> unit
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wenzelm@23645
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val pprint: T -> pprint_args -> unit
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wenzelm@23645
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val symbolicN: string
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wenzelm@16714
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val output_buffer: T -> Buffer.T
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wenzelm@23660
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val output: T -> output
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val string_of: T -> string
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val str_of: T -> string
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val writeln: T -> unit
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type pp
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val pp: (term -> T) * (typ -> T) * (sort -> T) * (class list -> T) * (arity -> T) -> pp
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val term: pp -> term -> T
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val typ: pp -> typ -> T
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val sort: pp -> sort -> T
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val classrel: pp -> class list -> T
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val arity: pp -> arity -> T
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val string_of_term: pp -> term -> string
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val string_of_typ: pp -> typ -> string
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val string_of_sort: pp -> sort -> string
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val string_of_classrel: pp -> class list -> string
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val string_of_arity: pp -> arity -> string
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end;
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structure Pretty: PRETTY =
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struct
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(** print mode operations **)
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wenzelm@23617
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fun default_indent (_: string) = Symbol.spaces;
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local
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val default = {indent = default_indent};
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wenzelm@23617
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val modes = ref (Symtab.make [("", default)]);
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in
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fun add_mode name indent = CRITICAL (fn () =>
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wenzelm@23922
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change modes (Symtab.update_new (name, {indent = indent})));
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wenzelm@23617
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fun get_mode () =
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wenzelm@24612
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the_default default (Library.get_first (Symtab.lookup (! modes)) (print_mode_value ()));
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wenzelm@23617
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end;
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wenzelm@23617
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wenzelm@23617
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fun mode_indent x y = #indent (get_mode ()) x y;
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wenzelm@23645
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val output_spaces = Output.output o Symbol.spaces;
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wenzelm@23645
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val add_indent = Buffer.add o output_spaces;
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wenzelm@23617
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wenzelm@10952
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(** printing items: compound phrases, strings, and breaks **)
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datatype T =
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wenzelm@23617
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Block of Markup.T * T list * int * int | (*markup, body, indentation, length*)
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wenzelm@23660
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String of output * int | (*text, length*)
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wenzelm@23617
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Break of bool * int; (*mandatory flag, width if not taken*)
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wenzelm@23645
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fun length (Block (_, _, _, len)) = len
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| length (String (_, len)) = len
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wenzelm@23645
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| length (Break (_, wd)) = wd;
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wenzelm@9730
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wenzelm@9730
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wenzelm@23645
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(** derived operations to create formatting expressions **)
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wenzelm@23645
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wenzelm@23645
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val str = String o Output.output_width;
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wenzelm@23645
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fun brk wd = Break (false, wd);
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wenzelm@23645
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val fbrk = Break (true, 2);
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wenzelm@23645
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fun breaks prts = Library.separate (brk 1) prts;
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fun fbreaks prts = Library.separate fbrk prts;
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fun markup_block m (indent, es) =
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let
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fun sum [] k = k
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| sum (e :: es) k = sum es (length e + k);
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in Block (m, es, indent, sum es 0) end;
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val blk = markup_block Markup.none;
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wenzelm@23645
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fun block prts = blk (2, prts);
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wenzelm@23645
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val strs = block o breaks o map str;
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fun markup m prts = markup_block m (0, prts);
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wenzelm@26703
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fun mark m prt = markup m [prt];
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wenzelm@26703
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fun keyword name = mark (Markup.keyword name) (str name);
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wenzelm@26703
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fun command name = mark (Markup.command name) (str name);
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wenzelm@23645
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wenzelm@23645
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fun markup_chunks m prts = markup m (fbreaks prts);
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wenzelm@23645
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val chunks = markup_chunks Markup.none;
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wenzelm@23645
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fun chunks2 prts = blk (0, flat (Library.separate [fbrk, fbrk] (map single prts)));
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wenzelm@23645
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fun block_enclose (p1, p2) ps = chunks [(block o fbreaks) (p1 :: ps), p2];
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wenzelm@23645
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fun quote prt = blk (1, [str "\"", prt, str "\""]);
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wenzelm@23645
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fun backquote prt = blk (1, [str "`", prt, str "`"]);
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fun separate sep prts =
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flat (Library.separate [str sep, brk 1] (map single prts));
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val commas = separate ",";
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fun enclose lpar rpar prts =
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block (str lpar :: (prts @ [str rpar]));
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fun enum sep lpar rpar prts = enclose lpar rpar (separate sep prts);
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val list = enum ",";
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wenzelm@23645
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fun str_list lpar rpar strs = list lpar rpar (map str strs);
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fun big_list name prts = block (fbreaks (str name :: prts));
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fun indent 0 prt = prt
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wenzelm@23645
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| indent n prt = blk (0, [str (Symbol.spaces n), prt]);
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wenzelm@23645
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wenzelm@23645
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fun unbreakable (Break (_, wd)) = String (output_spaces wd, wd)
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wenzelm@23645
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| unbreakable (Block (m, es, indent, wd)) = Block (m, map unbreakable es, indent, wd)
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wenzelm@23645
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| unbreakable (e as String _) = e;
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wenzelm@23645
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wenzelm@23645
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(** formatting **)
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wenzelm@23645
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wenzelm@23645
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(* margin *)
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wenzelm@23645
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wenzelm@23645
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fun make_margin_info m =
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wenzelm@23645
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{margin = m, (*right margin, or page width*)
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wenzelm@23645
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breakgain = m div 20, (*minimum added space required of a break*)
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wenzelm@23645
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emergencypos = m div 2}; (*position too far to right*)
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wenzelm@23645
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wenzelm@23645
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val margin_info = ref (make_margin_info 76);
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wenzelm@23645
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fun setmargin m = margin_info := make_margin_info m;
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wenzelm@23645
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fun setmp_margin m f = setmp margin_info (make_margin_info m) f;
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wenzelm@23645
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wenzelm@23645
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wenzelm@23645
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(* depth limitation *)
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wenzelm@23645
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wenzelm@23645
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val depth = ref 0; (*maximum depth; 0 means no limit*)
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wenzelm@23645
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fun setdepth dp = (depth := dp);
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wenzelm@23645
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wenzelm@23645
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local
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wenzelm@23645
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fun pruning dp (Block (m, bes, indent, wd)) =
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wenzelm@23645
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if dp > 0
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wenzelm@23645
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then markup_block m (indent, map (pruning (dp - 1)) bes)
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wenzelm@23645
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else str "..."
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wenzelm@23645
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| pruning dp e = e
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wenzelm@23645
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in
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wenzelm@23645
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fun prune e = if ! depth > 0 then pruning (! depth) e else e;
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wenzelm@23645
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end;
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wenzelm@23645
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wenzelm@23645
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wenzelm@23645
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(* formatted output *)
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wenzelm@23645
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wenzelm@23645
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local
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wenzelm@6116
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wenzelm@17756
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type text = {tx: Buffer.T, ind: Buffer.T, pos: int, nl: int};
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wenzelm@17756
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wenzelm@17756
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val empty: text =
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wenzelm@10952
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{tx = Buffer.empty,
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wenzelm@10952
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ind = Buffer.empty,
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wenzelm@10952
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pos = 0,
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wenzelm@10952
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nl = 0};
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wenzelm@6116
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wenzelm@17756
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fun newline {tx, ind, pos, nl} : text =
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wenzelm@14832
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{tx = Buffer.add (Output.output "\n") tx,
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wenzelm@10952
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ind = Buffer.empty,
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wenzelm@10952
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pos = 0,
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wenzelm@10952
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nl = nl + 1};
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wenzelm@6116
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wenzelm@23628
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fun control s {tx, ind, pos: int, nl} : text =
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wenzelm@23628
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{tx = Buffer.add s tx,
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wenzelm@23628
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ind = ind,
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wenzelm@23628
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pos = pos,
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wenzelm@23628
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nl = nl};
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wenzelm@23628
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wenzelm@17756
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fun string (s, len) {tx, ind, pos: int, nl} : text =
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wenzelm@10952
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{tx = Buffer.add s tx,
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wenzelm@10952
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ind = Buffer.add s ind,
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wenzelm@10952
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pos = pos + len,
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wenzelm@10952
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nl = nl};
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wenzelm@6116
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wenzelm@10952
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fun blanks wd = string (output_spaces wd, wd);
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wenzelm@6116
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wenzelm@17756
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fun indentation (buf, len) {tx, ind, pos, nl} : text =
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wenzelm@10952
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let val s = Buffer.content buf in
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wenzelm@23617
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{tx = Buffer.add (mode_indent s len) tx,
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wenzelm@10952
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ind = Buffer.add s ind,
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wenzelm@10952
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pos = pos + len,
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wenzelm@10952
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nl = nl}
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wenzelm@10952
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end;
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wenzelm@6116
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wenzelm@10952
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(*Add the lengths of the expressions until the next Break; if no Break then
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wenzelm@10952
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include "after", to account for text following this block.*)
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wenzelm@23617
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fun breakdist (Block (_, _, _, len) :: es, after) = len + breakdist (es, after)
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wenzelm@10952
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| breakdist (String (s, len) :: es, after) = len + breakdist (es, after)
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wenzelm@10952
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| breakdist (Break _ :: es, after) = 0
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wenzelm@10952
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| breakdist ([], after) = after;
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wenzelm@10952
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wenzelm@10952
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(*Search for the next break (at this or higher levels) and force it to occur.*)
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wenzelm@6116
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fun forcenext [] = []
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wenzelm@10952
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| forcenext (Break (_, wd) :: es) = Break (true, 0) :: es
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wenzelm@6116
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| forcenext (e :: es) = e :: forcenext es;
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wenzelm@6116
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wenzelm@6116
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(*es is list of expressions to print;
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wenzelm@6116
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blockin is the indentation of the current block;
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wenzelm@10952
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after is the width of the following context until next break.*)
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wenzelm@6116
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fun format ([], _, _) text = text
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wenzelm@10952
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| format (e :: es, block as (blockind, blockin), after) (text as {ind, pos, nl, ...}) =
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wenzelm@10952
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(case e of
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wenzelm@23617
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Block (markup, bes, indent, wd) =>
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wenzelm@10952
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let
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wenzelm@10952
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val {emergencypos, ...} = ! margin_info;
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wenzelm@10952
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val pos' = pos + indent;
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wenzelm@10952
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val pos'' = pos' mod emergencypos;
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wenzelm@10952
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val block' =
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wenzelm@10952
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if pos' < emergencypos then (ind |> add_indent indent, pos')
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wenzelm@23645
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else (add_indent pos'' Buffer.empty, pos'');
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wenzelm@23698
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val (bg, en) = Markup.output markup;
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wenzelm@23617
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val btext: text = text
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wenzelm@23628
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|> control bg
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wenzelm@23617
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|> format (bes, block', breakdist (es, after))
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wenzelm@23628
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|> control en;
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wenzelm@10952
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(*if this block was broken then force the next break*)
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wenzelm@23617
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val es' = if nl < #nl btext then forcenext es else es;
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wenzelm@23617
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in format (es', block, after) btext end
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wenzelm@10952
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| String str => format (es, block, after) (string str text)
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wenzelm@10952
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| Break (force, wd) =>
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wenzelm@10952
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let val {margin, breakgain, ...} = ! margin_info in
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wenzelm@10952
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(*no break if text to next break fits on this line
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wenzelm@10952
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or if breaking would add only breakgain to space*)
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wenzelm@10952
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format (es, block, after)
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wenzelm@10952
|
287 |
(if not force andalso
|
wenzelm@10952
|
288 |
pos + wd <= Int.max (margin - breakdist (es, after), blockin + breakgain)
|
wenzelm@10952
|
289 |
then text |> blanks wd (*just insert wd blanks*)
|
wenzelm@10952
|
290 |
else text |> newline |> indentation block)
|
wenzelm@10952
|
291 |
end);
|
wenzelm@6116
|
292 |
|
wenzelm@23645
|
293 |
in
|
wenzelm@6116
|
294 |
|
wenzelm@23645
|
295 |
fun formatted e = #tx (format ([prune e], (Buffer.empty, 0), 0) empty);
|
wenzelm@6116
|
296 |
|
wenzelm@23645
|
297 |
end;
|
wenzelm@6116
|
298 |
|
wenzelm@19266
|
299 |
|
wenzelm@23645
|
300 |
(* special output *)
|
wenzelm@6116
|
301 |
|
wenzelm@23645
|
302 |
(*symbolic markup -- no formatting*)
|
wenzelm@23645
|
303 |
fun symbolic prt =
|
wenzelm@6116
|
304 |
let
|
wenzelm@23787
|
305 |
fun out (Block (m, [], _, _)) = Buffer.markup m I
|
wenzelm@23659
|
306 |
| out (Block (m, prts, indent, _)) =
|
wenzelm@23787
|
307 |
Buffer.markup m (Buffer.markup (Markup.block indent) (fold out prts))
|
wenzelm@23645
|
308 |
| out (String (s, _)) = Buffer.add s
|
wenzelm@23787
|
309 |
| out (Break (false, wd)) = Buffer.markup (Markup.break wd) (Buffer.add (output_spaces wd))
|
wenzelm@23787
|
310 |
| out (Break (true, _)) = Buffer.markup Markup.fbreak (Buffer.add (output_spaces 1));
|
wenzelm@23645
|
311 |
in out prt Buffer.empty end;
|
wenzelm@23617
|
312 |
|
wenzelm@23645
|
313 |
(*unformatted output*)
|
wenzelm@23645
|
314 |
fun unformatted prt =
|
wenzelm@6116
|
315 |
let
|
wenzelm@23787
|
316 |
fun fmt (Block (m, prts, _, _)) = Buffer.markup m (fold fmt prts)
|
wenzelm@23617
|
317 |
| fmt (String (s, _)) = Buffer.add s
|
wenzelm@23617
|
318 |
| fmt (Break (false, wd)) = Buffer.add (output_spaces wd)
|
wenzelm@23617
|
319 |
| fmt (Break (true, _)) = Buffer.add (output_spaces 1);
|
wenzelm@23645
|
320 |
in fmt (prune prt) Buffer.empty end;
|
wenzelm@6116
|
321 |
|
wenzelm@23645
|
322 |
(*ML toplevel pretty printing*)
|
wenzelm@6116
|
323 |
fun pprint prt (put_str, begin_blk, put_brk, put_fbrk, end_blk) =
|
wenzelm@6116
|
324 |
let
|
wenzelm@27350
|
325 |
fun pp (Block (_, prts, ind, _)) = (begin_blk ind; pp_lst prts; end_blk ())
|
wenzelm@6116
|
326 |
| pp (String (s, _)) = put_str s
|
wenzelm@6116
|
327 |
| pp (Break (false, wd)) = put_brk wd
|
wenzelm@6116
|
328 |
| pp (Break (true, _)) = put_fbrk ()
|
wenzelm@6116
|
329 |
and pp_lst [] = ()
|
wenzelm@6116
|
330 |
| pp_lst (prt :: prts) = (pp prt; pp_lst prts);
|
wenzelm@23645
|
331 |
in pp (prune prt) end;
|
wenzelm@23645
|
332 |
|
wenzelm@23645
|
333 |
|
wenzelm@23645
|
334 |
(* output interfaces *)
|
wenzelm@23645
|
335 |
|
wenzelm@23645
|
336 |
val symbolicN = "pretty_symbolic";
|
wenzelm@23645
|
337 |
|
wenzelm@23645
|
338 |
fun output_buffer prt =
|
wenzelm@23645
|
339 |
if print_mode_active symbolicN then symbolic prt
|
wenzelm@23645
|
340 |
else formatted prt;
|
wenzelm@23645
|
341 |
|
wenzelm@23645
|
342 |
val output = Buffer.content o output_buffer;
|
wenzelm@23645
|
343 |
val string_of = Output.escape o output;
|
wenzelm@23645
|
344 |
val str_of = Output.escape o Buffer.content o unformatted;
|
wenzelm@23645
|
345 |
val writeln = Output.writeln o string_of;
|
wenzelm@6116
|
346 |
|
wenzelm@6116
|
347 |
|
wenzelm@14832
|
348 |
|
wenzelm@14832
|
349 |
(** abstract pretty printing context **)
|
wenzelm@14832
|
350 |
|
wenzelm@14832
|
351 |
datatype pp =
|
wenzelm@14832
|
352 |
PP of (term -> T) * (typ -> T) * (sort -> T) * (class list -> T) * (arity -> T);
|
wenzelm@14832
|
353 |
|
wenzelm@14972
|
354 |
val pp = PP;
|
wenzelm@14832
|
355 |
|
wenzelm@14832
|
356 |
fun pp_fun f (PP x) = f x;
|
wenzelm@14832
|
357 |
|
wenzelm@14832
|
358 |
val term = pp_fun #1;
|
wenzelm@14832
|
359 |
val typ = pp_fun #2;
|
wenzelm@14832
|
360 |
val sort = pp_fun #3;
|
wenzelm@14832
|
361 |
val classrel = pp_fun #4;
|
wenzelm@14832
|
362 |
val arity = pp_fun #5;
|
wenzelm@14832
|
363 |
|
wenzelm@14832
|
364 |
val string_of_term = string_of oo term;
|
wenzelm@14832
|
365 |
val string_of_typ = string_of oo typ;
|
wenzelm@14832
|
366 |
val string_of_sort = string_of oo sort;
|
wenzelm@14832
|
367 |
val string_of_classrel = string_of oo classrel;
|
wenzelm@14832
|
368 |
val string_of_arity = string_of oo arity;
|
wenzelm@14832
|
369 |
|
wenzelm@6116
|
370 |
end;
|