diff options
Diffstat (limited to 'stdlib/format.ml')
| -rw-r--r-- | stdlib/format.ml | 59 |
1 files changed, 36 insertions, 23 deletions
diff --git a/stdlib/format.ml b/stdlib/format.ml index ca31832e8..7f6fcc4a4 100644 --- a/stdlib/format.ml +++ b/stdlib/format.ml @@ -13,6 +13,9 @@ (* $Id$ *) +(* A pretty-printing facility and definition of formatters for ``parallel'' + (i.e. unrelated or independent) pretty-printing on multiple out channels. *) + (************************************************************** Data structures definitions. @@ -209,7 +212,7 @@ let pp_clear_queue state = pretty-printing algorithm's invariants. Given that this arithmetic correctness check is difficult and error prone and given that 1e10 + 1 is in practice large enough, there is no need to attempt to set - pp_infinity to the theoretically maximum limit. Is it not worth the + pp_infinity to the theoretically maximum limit. It is not worth the burden ! *) let pp_infinity = 1000000010;; @@ -260,7 +263,7 @@ let pp_skip_token state = (************************************************************** - The main pretting printing functions. + The main pretty printing functions. **************************************************************) @@ -382,21 +385,23 @@ let format_pp_token state size = function Size is known when not negative. Printing is delayed when the text waiting in the queue requires more room to format than exists on the current line. *) -let rec advance_left state = - try - match peek_queue state.pp_queue with - {elem_size = size; token = tok; length = len} -> - let size = int_of_size size in - if not - (size < 0 && - (state.pp_right_total - state.pp_left_total < state.pp_space_left)) - then begin - ignore(take_queue state.pp_queue); - format_pp_token state (if size < 0 then pp_infinity else size) tok; - state.pp_left_total <- len + state.pp_left_total; - advance_left state - end - with Empty_queue -> ();; +let rec advance_loop state = + match peek_queue state.pp_queue with + | {elem_size = size; token = tok; length = len} -> + let size = int_of_size size in + if not + (size < 0 && + (state.pp_right_total - state.pp_left_total < state.pp_space_left)) + then begin + ignore(take_queue state.pp_queue); + format_pp_token state (if size < 0 then pp_infinity else size) tok; + state.pp_left_total <- len + state.pp_left_total; + advance_loop state + end;; + +let advance_left state = + try advance_loop state with + | Empty_queue -> ();; let enqueue_advance state tok = pp_enqueue state tok; advance_left state;; @@ -479,7 +484,7 @@ let pp_open_box_gen state indent br_ty = (* The box which is always opened. *) let pp_open_sys_box state = pp_open_box_gen state 0 Pp_hovbox;; -(* Close a block, setting sizes of its subblocks. *) +(* Close a block, setting sizes of its sub blocks. *) let pp_close_box state () = if state.pp_curr_depth > 1 then begin @@ -802,8 +807,9 @@ let rec display_blanks state n = (* Default function to output new lines. *) let display_newline state () = state.pp_output_function "\n" 0 1;; -let make_formatter f g = - let ff = pp_make_formatter f g ignore ignore in +(* Make a formatter with default functions to output spaces and new lines. *) +let make_formatter output flush = + let ff = pp_make_formatter output flush ignore ignore in ff.pp_output_newline <- display_newline ff; ff.pp_output_spaces <- display_blanks ff; ff;; @@ -816,6 +822,7 @@ let formatter_of_buffer b = let stdbuf = Buffer.create 512;; +(* Predefined formatters. *) let str_formatter = formatter_of_buffer stdbuf;; let std_formatter = formatter_of_out_channel stdout;; let err_formatter = formatter_of_out_channel stderr;; @@ -1121,10 +1128,16 @@ let mkprintf to_s get_out = and get_tag_name n i c = let rec get accu n i j = - if j >= len - then c (implode_rev (Sformat.sub fmt (Sformat.index_of_int i) (j - i)) accu) n j else + if j >= len then + c (implode_rev + (Sformat.sub fmt (Sformat.index_of_int i) (j - i)) + accu) + n j else match Sformat.get fmt j with - | '>' -> c (implode_rev (Sformat.sub fmt (Sformat.index_of_int i) (j - i)) accu) n j + | '>' -> + c (implode_rev (Sformat.sub fmt (Sformat.index_of_int i) (j - i)) + accu) + n j | '%' -> let s0 = Sformat.sub fmt (Sformat.index_of_int i) (j - i) in let cont_s n s i = get (s :: s0 :: accu) n i i |