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|
(**************************************************************************)
(* *)
(* SMTCoq *)
(* Copyright (C) 2011 - 2021 *)
(* *)
(* See file "AUTHORS" for the list of authors *)
(* *)
(* This file is distributed under the terms of the CeCILL-C licence *)
(* *)
(**************************************************************************)
(* Lexer for S-expressions
Adapted from the OCaml sexplib, which is part of the ocaml-core
alternative standard library for OCaml.
*)
{
(** Lexer: Lexer Specification for S-expressions *)
open Printf
open Lexing
open SExprParser
}
let lf = '\010'
let lf_cr = ['\010' '\013']
let dos_newline = "\013\010"
let blank = [' ' '\009' '\012']
let unquoted = [^ ';' '(' ')' '"'] # blank # lf_cr
let digit = ['0'-'9']
let hexdigit = digit | ['a'-'f' 'A'-'F']
let unquoted_start =
unquoted # ['#' '|'] | '#' unquoted # ['|'] | '|' unquoted # ['#']
rule main buf = parse
| lf | dos_newline { SmtMisc.found_newline lexbuf 0; main buf lexbuf }
| blank+ | ';' (_ # lf_cr)* { main buf lexbuf }
| '(' { LPAREN }
| ')' { RPAREN }
| '"'
{
scan_string buf (lexeme_start_p lexbuf) lexbuf;
let str = Buffer.contents buf in
Buffer.clear buf;
STRING str
}
| "#;" { HASH_SEMI }
| "#|"
{
scan_block_comment buf [lexeme_start_p lexbuf] lexbuf;
main buf lexbuf
}
| "|#" { SmtMisc.main_failure lexbuf "illegal end of comment" }
| '|'
{
scan_quoted buf (lexeme_start_p lexbuf) lexbuf;
let str = Buffer.contents buf in
Buffer.clear buf;
STRING ("|"^ str ^"|")
}
| unquoted_start unquoted* ("#|" | "|#") unquoted*
{ SmtMisc.main_failure lexbuf "comment tokens in unquoted atom" }
| "#" | unquoted_start unquoted* as str { STRING str }
| eof { EOF }
and scan_string buf start = parse
| '"' { () }
| '\\' lf [' ' '\t']*
{
SmtMisc.found_newline lexbuf (SmtMisc.lexeme_len lexbuf - 2);
scan_string buf start lexbuf
}
| '\\' dos_newline [' ' '\t']*
{
SmtMisc.found_newline lexbuf (SmtMisc.lexeme_len lexbuf - 3);
scan_string buf start lexbuf
}
| '\\' (['\\' '\'' '"' 'n' 't' 'b' 'r' ' '] as c)
{
Buffer.add_char buf (SmtMisc.char_for_backslash c);
scan_string buf start lexbuf
}
| '\\' (digit as c1) (digit as c2) (digit as c3)
{
let v = SmtMisc.dec_code c1 c2 c3 in
if v > 255 then (
let { pos_lnum; pos_bol; pos_cnum; _ } = lexeme_end_p lexbuf in
let msg =
sprintf
"Sexplib.Lexer.scan_string: \
illegal escape at line %d char %d: `\\%c%c%c'"
pos_lnum (pos_cnum - pos_bol - 3)
c1 c2 c3 in
failwith msg);
Buffer.add_char buf (Char.chr v);
scan_string buf start lexbuf
}
| '\\' 'x' (hexdigit as c1) (hexdigit as c2)
{
let v = SmtMisc.hex_code c1 c2 in
Buffer.add_char buf (Char.chr v);
scan_string buf start lexbuf
}
| '\\' (_ as c)
{
Buffer.add_char buf '\\';
Buffer.add_char buf c;
scan_string buf start lexbuf
}
| lf
{
SmtMisc.found_newline lexbuf 0;
Buffer.add_char buf SmtMisc.lf;
scan_string buf start lexbuf
}
| ([^ '\\' '"'] # lf)+
{
Buffer.add_string buf (lexeme lexbuf);
scan_string buf start lexbuf
}
| eof
{
let msg =
sprintf
"Sexplib.Lexer.scan_string: unterminated string at line %d char %d"
start.pos_lnum (start.pos_cnum - start.pos_bol)
in
failwith msg
}
and scan_quoted buf start = parse
| '|' { () }
| '\\' lf [' ' '\t']*
{
SmtMisc.found_newline lexbuf (SmtMisc.lexeme_len lexbuf - 2);
scan_quoted buf start lexbuf
}
| '\\' dos_newline [' ' '\t']*
{
SmtMisc.found_newline lexbuf (SmtMisc.lexeme_len lexbuf - 3);
scan_quoted buf start lexbuf
}
| '\\' (['\\' '\'' '"' 'n' 't' 'b' 'r' ' ' '|'] as c)
{
Buffer.add_char buf (SmtMisc.char_for_backslash c);
scan_quoted buf start lexbuf
}
| '\\' (digit as c1) (digit as c2) (digit as c3)
{
let v = SmtMisc.dec_code c1 c2 c3 in
if v > 255 then (
let { pos_lnum; pos_bol; pos_cnum; _ } = lexeme_end_p lexbuf in
let msg =
sprintf
"Sexplib.Lexer.scan_quoted: \
illegal escape at line %d char %d: `\\%c%c%c'"
pos_lnum (pos_cnum - pos_bol - 3)
c1 c2 c3 in
failwith msg);
Buffer.add_char buf (Char.chr v);
scan_quoted buf start lexbuf
}
| '\\' 'x' (hexdigit as c1) (hexdigit as c2)
{
let v = SmtMisc.hex_code c1 c2 in
Buffer.add_char buf (Char.chr v);
scan_quoted buf start lexbuf
}
| '\\' (_ as c)
{
Buffer.add_char buf '\\';
Buffer.add_char buf c;
scan_quoted buf start lexbuf
}
| lf
{
SmtMisc.found_newline lexbuf 0;
Buffer.add_char buf SmtMisc.lf;
scan_quoted buf start lexbuf
}
| ([^ '\\' '|'] # lf)+
{
Buffer.add_string buf (lexeme lexbuf);
scan_quoted buf start lexbuf
}
| eof
{
let msg =
sprintf
"Sexplib.Lexer.scan_quoted: unterminated ident at line %d char %d"
start.pos_lnum (start.pos_cnum - start.pos_bol)
in
failwith msg
}
and scan_block_comment buf locs = parse
| ('#'* | '|'*) lf
{ SmtMisc.found_newline lexbuf 0; scan_block_comment buf locs lexbuf }
| (('#'* | '|'*) [^ '"' '#' '|'] # lf)+ { scan_block_comment buf locs lexbuf }
| ('#'* | '|'*) '"'
{
let cur = lexeme_end_p lexbuf in
let start = { cur with pos_cnum = cur.pos_cnum - 1 } in
scan_string buf start lexbuf;
Buffer.clear buf;
scan_block_comment buf locs lexbuf
}
| '#'+ '|'
{
let cur = lexeme_end_p lexbuf in
let start = { cur with pos_cnum = cur.pos_cnum - 2 } in
scan_block_comment buf (start :: locs) lexbuf
}
| '|'+ '#'
{
match locs with
| [_] -> ()
| _ :: t -> scan_block_comment buf t lexbuf
| [] -> assert false (* impossible *)
}
| eof
{
match locs with
| [] -> assert false
| { pos_lnum; pos_bol; pos_cnum; _ } :: _ ->
let msg =
sprintf "Sexplib.Lexer.scan_block_comment: \
unterminated block comment at line %d char %d"
pos_lnum (pos_cnum - pos_bol)
in
failwith msg
}
and ruleTail acc = parse
| eof { acc }
| _* as str { ruleTail (acc ^ str) lexbuf }
{
let main ?buf =
let buf =
match buf with
| None -> Buffer.create 64
| Some buf -> Buffer.clear buf; buf
in
main buf
}
|
