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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: pretty.mll 8666 2006-03-27 17:02:49Z notin $ i*)
(*s Utility functions for the scanners *)
{
open Cdglobals
open Printf
open Index
open Lexing
open Output
(* count the number of spaces at the beginning of a string *)
let count_spaces s =
let n = String.length s in
let rec count c i =
if i == n then c else match s.[i] with
| '\t' -> count (c + (8 - (c mod 8))) (i + 1)
| ' ' -> count (c + 1) (i + 1)
| _ -> c
in
count 0 0
let count_dashes s =
let c = ref 0 in
for i = 0 to String.length s - 1 do if s.[i] = '-' then incr c done;
!c
let cut_head_tail_spaces s =
let n = String.length s in
let rec look_up i = if i == n || s.[i] <> ' ' then i else look_up (i+1) in
let rec look_dn i = if i == -1 || s.[i] <> ' ' then i else look_dn (i-1) in
let l = look_up 0 in
let r = look_dn (n-1) in
if l <= r then String.sub s l (r-l+1) else s
let sec_title s =
let rec count lev i =
if s.[i] = '*' then
count (succ lev) (succ i)
else
let t = String.sub s i (String.length s - i) in
lev, cut_head_tail_spaces t
in
count 0 (String.index s '*')
let formatted = ref false
let brackets = ref 0
let backtrack lexbuf = lexbuf.lex_curr_pos <- lexbuf.lex_start_pos
let is_space = function ' ' | '\t' | '\n' | '\r' -> true | _ -> false
(* saving/restoring the PP state *)
type state = {
st_gallina : bool;
st_light : bool
}
let state_stack = Stack.create ()
let save_state () =
Stack.push { st_gallina = !gallina; st_light = !light } state_stack
let restore_state () =
let s = Stack.pop state_stack in
gallina := s.st_gallina;
light := s.st_light
let without_ref r f x = save_state (); r := false; f x; restore_state ()
let without_gallina = without_ref gallina
let without_light = without_ref light
let show_all f = without_gallina (without_light f)
let begin_show () = save_state (); gallina := false; light := false
let end_show () = restore_state ()
(* Reset the globals *)
let reset () =
formatted := false;
brackets := 0
(* erasing of Section/End *)
let section_re = Str.regexp "[ \t]*Section"
let end_re = Str.regexp "[ \t]*End"
let is_section s = Str.string_match section_re s 0
let is_end s = Str.string_match end_re s 0
let sections_to_close = ref 0
let section_or_end s =
if is_section s then begin
incr sections_to_close; true
end else if is_end s then begin
if !sections_to_close > 0 then begin
decr sections_to_close; true
end else
false
end else
true
(* tokens pretty-print *)
let token_buffer = Buffer.create 1024
let token_re =
Str.regexp "[ \t]*(\\*\\*[ \t]+printing[ \t]+\\([^ \t]+\\)"
let printing_token_re =
Str.regexp
"[ \t]*\\(\\(%\\([^%]*\\)%\\)\\|\\(\\$[^$]*\\$\\)\\)?[ \t]*\\(#\\(\\([^#]\\|&#\\)*\\)#\\)?"
let add_printing_token toks pps =
try
if Str.string_match token_re toks 0 then
let tok = Str.matched_group 1 toks in
if Str.string_match printing_token_re pps 0 then
let pp =
(try Some (Str.matched_group 3 pps) with _ ->
try Some (Str.matched_group 4 pps) with _ -> None),
(try Some (Str.matched_group 6 pps) with _ -> None)
in
Output.add_printing_token tok pp
with _ ->
()
let remove_token_re =
Str.regexp
"[ \t]*(\\*\\*[ \t]+remove[ \t]+printing[ \t]+\\([^ \t]+\\)[ \t]*\\*)"
let remove_printing_token toks =
try
if Str.string_match remove_token_re toks 0 then
let tok = Str.matched_group 1 toks in
Output.remove_printing_token tok
with _ ->
()
let extract_ident_re = Str.regexp "([ \t]*\\([^ \t]+\\)[ \t]*:="
let extract_ident s =
assert (String.length s >= 3);
if Str.string_match extract_ident_re s 0 then
Str.matched_group 1 s
else
String.sub s 1 (String.length s - 3)
}
(*s Regular expressions *)
let space = [' ' '\t']
let space_nl = [' ' '\t' '\n' '\r']
let firstchar =
['A'-'Z' 'a'-'z' '_'
(* iso 8859-1 accents *)
'\192'-'\214' '\216'-'\246' '\248'-'\255' ] |
(* utf-8 latin 1 supplement *)
'\195' ['\128'-'\191'] |
(* utf-8 letterlike symbols *)
'\226' ('\132' ['\128'-'\191'] | '\133' ['\128'-'\143'])
let identchar =
firstchar | ['\'' '0'-'9' '@']
let identifier = firstchar identchar*
let symbolchar_no_brackets =
['!' '$' '%' '&' '*' '+' ',' '@' '^' '#'
'\\' '/' '-' '<' '>' '|' ':' '?' '=' '~'
'{' '}' '(' ')'] |
(* utf-8 symbols *)
'\226' ['\134'-'\143' '\152'-'\155' '\164'-'\165' '\168'-'\171'] _
let symbolchar = symbolchar_no_brackets | '[' | ']'
let token = symbolchar+ | '[' [^ '[' ']' ':']* ']'
let thm_token =
"Theorem"
| "Lemma"
| "Fact"
| "Remark"
| "Corollary"
| "Proposition"
| "Property"
| "Goal"
let def_token =
"Definition"
| "Let"
| "SubClass"
| "Example"
| "Local"
| "Fixpoint"
| "CoFixpoint"
| "Record"
| "Structure"
| "Scheme"
| "Inductive"
| "CoInductive"
let decl_token =
"Hypothesis"
| "Hypotheses"
| "Parameter"
| "Axiom" 's'?
| "Conjecture"
let gallina_ext =
"Module"
| "Declare"
| "Transparent"
| "Opaque"
| "Canonical"
| "Coercion"
| "Identity"
| "Implicit"
| "Notation"
| "Infix"
| "Tactic" space+ "Notation"
| "Reserved" space+ "Notation"
let commands =
"Pwd"
| "Cd"
| "Drop"
| "ProtectedLoop"
| "Quit"
| "Load"
| "Add"
| "Remove" space+ "Loadpath"
| "Print"
| "Inspect"
| "About"
| "Search"
| "Eval"
| "Reset"
| "Check"
| "Type"
let extraction =
"Extraction"
| "Recursive" space+ "Extraction"
| "Extract"
let gallina_kw = thm_token | def_token | decl_token | gallina_ext | commands | extraction
let gallina_kw_to_hide =
"Implicit"
| "Ltac"
| "Require"
| "Import"
| "Export"
| "Load"
| "Hint"
| "Open"
| "Close"
| "Delimit"
| "Transparent"
| "Opaque"
| ("Declare" space+ ("Morphism" | "Step") )
| "Section"
| "Chapter"
| "Variable" 's'?
| ("Hypothesis" | "Hypotheses")
| "End"
| ("Set" | "Unset") space+ "Printing" space+ "Coercions"
| "Declare" space+ ("Left" | "Right") space+ "Step"
(* tokens with balanced brackets *)
let token_brackets =
( symbolchar_no_brackets+ ('[' symbolchar_no_brackets* ']')*
| symbolchar_no_brackets* ('[' symbolchar_no_brackets* ']')+ )
symbolchar_no_brackets*
let section = "*" | "**" | "***" | "****"
let item_space = " "
let begin_hide = "(*" space* "begin" space+ "hide" space* "*)" space* '\n'
let end_hide = "(*" space* "end" space+ "hide" space* "*)" space* '\n'
let begin_show = "(*" space* "begin" space+ "show" space* "*)" space* '\n'
let end_show = "(*" space* "end" space+ "show" space* "*)" space* '\n'
(*
let begin_verb = "(*" space* "begin" space+ "verb" space* "*)"
let end_verb = "(*" space* "end" space+ "verb" space* "*)"
*)
(*s Scanning Coq, at beginning of line *)
rule coq_bol = parse
| space* '\n'+
{ empty_line_of_code (); coq_bol lexbuf }
| space* "(**" space_nl
{ end_coq (); start_doc ();
let eol = doc_bol lexbuf in
end_doc (); start_coq ();
if eol then coq_bol lexbuf else coq lexbuf }
| space* "Comments" space_nl
{ end_coq (); start_doc (); comments lexbuf; end_doc ();
start_coq (); coq lexbuf }
| space* begin_hide
{ skip_hide lexbuf; coq_bol lexbuf }
| space* begin_show
{ begin_show (); coq_bol lexbuf }
| space* end_show
{ end_show (); coq_bol lexbuf }
| space* gallina_kw_to_hide
{ let s = lexeme lexbuf in
if !light && section_or_end s then begin
skip_to_dot lexbuf;
coq_bol lexbuf
end else begin
let s = lexeme lexbuf in
let nbsp = count_spaces s in
indentation nbsp;
let s = String.sub s nbsp (String.length s - nbsp) in
ident s (lexeme_start lexbuf + nbsp);
let eol= body lexbuf in
if eol then coq_bol lexbuf else coq lexbuf
end }
| space* gallina_kw
{ let s = lexeme lexbuf in
let nbsp = count_spaces s in
indentation nbsp;
let s = String.sub s nbsp (String.length s - nbsp) in
ident s (lexeme_start lexbuf + nbsp);
let eol= body lexbuf in
if eol then coq_bol lexbuf else coq lexbuf }
| space* "(**" space+ "printing" space+ (identifier | token) space+
{ let tok = lexeme lexbuf in
let s = printing_token lexbuf in
add_printing_token tok s;
coq_bol lexbuf }
| space* "(**" space+ "printing" space+
{ eprintf "warning: bad 'printing' command at character %d\n"
(lexeme_start lexbuf); flush stderr;
ignore (comment lexbuf);
coq_bol lexbuf }
| space* "(**" space+ "remove" space+ "printing" space+
(identifier | token) space* "*)"
{ remove_printing_token (lexeme lexbuf);
coq_bol lexbuf }
| space* "(**" space+ "remove" space+ "printing" space+
{ eprintf "warning: bad 'remove printing' command at character %d\n"
(lexeme_start lexbuf); flush stderr;
ignore (comment lexbuf);
coq_bol lexbuf }
| space* "(*"
{ let eol = comment lexbuf in
if eol then coq_bol lexbuf else coq lexbuf }
| eof
{ () }
| _
{ let eol =
if not !gallina then
begin backtrack lexbuf; indentation 0; body_bol lexbuf end
else
skip_to_dot lexbuf
in
if eol then coq_bol lexbuf else coq lexbuf }
(*s Scanning Coq elsewhere *)
and coq = parse
| "\n"
{ line_break(); coq_bol lexbuf }
| "(**" space_nl
{ end_coq (); start_doc ();
let eol = doc_bol lexbuf in
end_doc (); start_coq ();
if eol then coq_bol lexbuf else coq lexbuf }
| "(*"
{ let eol = comment lexbuf in
if eol then begin line_break(); coq_bol lexbuf end
else coq lexbuf
}
| '\n'+ space* "]]"
{ if not !formatted then begin symbol (lexeme lexbuf); coq lexbuf end }
| eof
{ () }
| gallina_kw_to_hide
{ let s = lexeme lexbuf in
if !light && section_or_end s then begin
let eol = skip_to_dot lexbuf in
if eol then coq_bol lexbuf else coq lexbuf
end else begin
ident s (lexeme_start lexbuf);
let eol=body lexbuf in
if eol then coq_bol lexbuf else coq lexbuf
end }
| gallina_kw
{ let s = lexeme lexbuf in
ident s (lexeme_start lexbuf);
let eol = body lexbuf in
if eol then coq_bol lexbuf else coq lexbuf }
| space+ { char ' '; coq lexbuf }
| eof
{ () }
| _ { let eol =
if not !gallina then
begin backtrack lexbuf; indentation 0; body lexbuf end
else
skip_to_dot lexbuf
in
if eol then coq_bol lexbuf else coq lexbuf}
(*s Scanning documentation, at beginning of line *)
and doc_bol = parse
| space* "\n" '\n'*
{ paragraph (); doc_bol lexbuf }
| space* section [^')'] ([^'\n' '*'] | '*' [^'\n'')'])*
{ let lev, s = sec_title (lexeme lexbuf) in
section lev (fun () -> ignore (doc (from_string s)));
doc lexbuf }
| space* '-'+
{ let n = count_dashes (lexeme lexbuf) in
if n >= 4 then rule () else item n;
doc lexbuf }
| "<<" space*
{ start_verbatim (); verbatim lexbuf; doc_bol lexbuf }
| eof
{ false }
| _
{ backtrack lexbuf; doc lexbuf }
(*s Scanning documentation elsewhere *)
and doc = parse
| "\n"
{ char '\n'; doc_bol lexbuf }
| "["
{ brackets := 1;
start_inline_coq (); escaped_coq lexbuf; end_inline_coq ();
doc lexbuf }
| "[[" '\n' space*
{ formatted := true; start_code ();
indentation (count_spaces (lexeme lexbuf));
without_gallina coq lexbuf;
end_code (); formatted := false;
doc lexbuf }
| '*'* "*)" space* '\n'
{ true }
| '*'* "*)"
{ false }
| "$"
{ start_latex_math (); escaped_math_latex lexbuf; doc lexbuf }
| "$$"
{ char '$'; doc lexbuf }
| "%"
{ escaped_latex lexbuf; doc lexbuf }
| "%%"
{ char '%'; doc lexbuf }
| "#"
{ escaped_html lexbuf; doc lexbuf }
| "##"
{ char '#'; doc lexbuf }
| eof
{ false }
| _
{ char (lexeme_char lexbuf 0); doc lexbuf }
(*s Various escapings *)
and escaped_math_latex = parse
| "$" { stop_latex_math () }
| eof { stop_latex_math () }
| _ { latex_char (lexeme_char lexbuf 0); escaped_math_latex lexbuf }
and escaped_latex = parse
| "%" { () }
| eof { () }
| _ { latex_char (lexeme_char lexbuf 0); escaped_latex lexbuf }
and escaped_html = parse
| "#" { () }
| "&#"
{ html_char '&'; html_char '#'; escaped_html lexbuf }
| "##"
{ html_char '#'; escaped_html lexbuf }
| eof { () }
| _ { html_char (lexeme_char lexbuf 0); escaped_html lexbuf }
and verbatim = parse
| "\n>>" { verbatim_char '\n'; stop_verbatim () }
| eof { stop_verbatim () }
| _ { verbatim_char (lexeme_char lexbuf 0); verbatim lexbuf }
(*s Coq, inside quotations *)
and escaped_coq = parse
| "]"
{ decr brackets;
if !brackets > 0 then begin char ']'; escaped_coq lexbuf end }
| "["
{ incr brackets; char '['; escaped_coq lexbuf }
| "(*"
{ ignore (comment lexbuf); escaped_coq lexbuf }
| "*)"
{ (* likely to be a syntax error: we escape *) backtrack lexbuf }
| eof
{ () }
| token_brackets
{ let s = lexeme lexbuf in
symbol s;
escaped_coq lexbuf }
| (identifier '.')* identifier
{ ident (lexeme lexbuf) (lexeme_start lexbuf); escaped_coq lexbuf }
| _
{ char (lexeme_char lexbuf 0); escaped_coq lexbuf }
(*s Coq "Comments" command. *)
and comments = parse
| space_nl+
{ char ' '; comments lexbuf }
| '"' [^ '"']* '"'
{ let s = lexeme lexbuf in
let s = String.sub s 1 (String.length s - 2) in
ignore (doc (from_string s)); comments lexbuf }
| ([^ '.' '"'] | '.' [^ ' ' '\t' '\n'])+
{ escaped_coq (from_string (lexeme lexbuf)); comments lexbuf }
| "." (space_nl | eof)
{ () }
| eof
{ () }
| _
{ char (lexeme_char lexbuf 0); comments lexbuf }
(*s Skip comments *)
and comment = parse
| "(*" { ignore (comment lexbuf); comment lexbuf }
| "*)" space* '\n'+ { true }
| "*)" { false }
| eof { false }
| _ { comment lexbuf }
and skip_to_dot = parse
| '.' space* '\n' { true }
| eof | '.' space+ { false}
| "(*" { ignore (comment lexbuf); skip_to_dot lexbuf }
| _ { skip_to_dot lexbuf }
and body_bol = parse
| space+
{ indentation (count_spaces (lexeme lexbuf)); body lexbuf }
| _ { backtrack lexbuf; body lexbuf }
and body = parse
| '\n' {line_break(); body_bol lexbuf}
| eof { false }
| '.' space* '\n' | '.' space* eof { char '.'; line_break(); true }
| '.' space+ { char '.'; char ' '; false }
| "(*" { let eol = comment lexbuf in
if eol then body_bol lexbuf else body lexbuf }
| identifier
{ let s = lexeme lexbuf in
ident s (lexeme_start lexbuf); body lexbuf }
| token
{ let s = lexeme lexbuf in
symbol s; body lexbuf }
| _ { let c = lexeme_char lexbuf 0 in
char c; body lexbuf }
and skip_hide = parse
| eof | end_hide { () }
| _ { skip_hide lexbuf }
(*s Reading token pretty-print *)
and printing_token = parse
| "*)" | eof
{ let s = Buffer.contents token_buffer in
Buffer.clear token_buffer;
s }
| _ { Buffer.add_string token_buffer (lexeme lexbuf);
printing_token lexbuf }
(*s Applying the scanners to files *)
{
let coq_file f m =
reset ();
Index.scan_file f m;
start_module ();
let c = open_in f in
let lb = from_channel c in
start_coq (); coq_bol lb; end_coq ();
close_in c
}
|