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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
{
exception Unterminated
let utf8_adjust = ref 0
let utf8_lexeme_start lexbuf =
Lexing.lexeme_start lexbuf - !utf8_adjust
}
let space = [' ' '\n' '\r' '\t' '\012'] (* '\012' is form-feed *)
let number = [ '0'-'9' ]+
let string = "\"" _+ "\""
let alpha = ['a'-'z' 'A'-'Z']
let ident = alpha (alpha | number | '_' | "'")*
let undotted_sep = ((number | '[' ident ']') space* ':' space*)? '{' | '}' | '-'+ | '+'+ | '*'+
let vernac_control = "Fail" | "Time" | "Redirect" space+ string | "Timeout" space+ number
let dot_sep = '.' (space | eof)
let utf8_extra_byte = [ '\x80' - '\xBF' ]
rule coq_string = parse
| "\"\"" { coq_string lexbuf }
| "\"" { () }
| eof { () }
| utf8_extra_byte { incr utf8_adjust; coq_string lexbuf }
| _ { coq_string lexbuf }
and comment = parse
| "(*" { let _ = comment lexbuf in comment lexbuf }
| "\"" { let () = coq_string lexbuf in comment lexbuf }
| "*)" { Some (utf8_lexeme_start lexbuf) }
| eof { None }
| utf8_extra_byte { incr utf8_adjust; comment lexbuf }
| _ { comment lexbuf }
(** NB : [mkiter] should be called on increasing offsets *)
and sentence initial stamp = parse
| "(*" {
match comment lexbuf with
| None -> raise Unterminated
| Some comm_last ->
stamp comm_last Tags.Script.comment;
sentence initial stamp lexbuf
}
| "\"" {
let () = coq_string lexbuf in
sentence false stamp lexbuf
}
| ".." {
(* We must have a particular rule for parsing "..", where no dot
is a terminator, even if we have a blank afterwards
(cf. for instance the syntax for recursive notation).
This rule and the following one also allow to treat the "..."
special case, where the third dot is a terminator. *)
sentence false stamp lexbuf
}
| dot_sep {
(* The usual "." terminator *)
stamp (utf8_lexeme_start lexbuf) Tags.Script.sentence;
sentence true stamp lexbuf
}
| (vernac_control space+)* undotted_sep {
(* Separators like { or } and bullets * - + are only active
at the start of a sentence *)
if initial then stamp (utf8_lexeme_start lexbuf + String.length (Lexing.lexeme lexbuf) - 1) Tags.Script.sentence;
sentence initial stamp lexbuf
}
| space+ {
(* Parsing spaces is the only situation preserving initiality *)
sentence initial stamp lexbuf
}
| utf8_extra_byte { incr utf8_adjust; sentence false stamp lexbuf }
| eof { if initial then () else raise Unterminated }
| _ {
(* Any other characters *)
sentence false stamp lexbuf
}
{
(** Parse sentences in string [slice], tagging last characters
of sentences with the [stamp] function.
It will raise [Unterminated] if [slice] ends with an unfinished
sentence.
*)
let delimit_sentences stamp slice =
utf8_adjust := 0;
sentence true stamp (Lexing.from_string slice)
}
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