105 lines
3.5 KiB
OCaml
105 lines
3.5 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* The run-time library for lexers generated by camllex *)
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type lexbuf =
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{ refill_buff : lexbuf -> unit;
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mutable lex_buffer : string;
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mutable lex_buffer_len : int;
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mutable lex_abs_pos : int;
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mutable lex_start_pos : int;
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mutable lex_curr_pos : int;
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mutable lex_last_pos : int;
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mutable lex_last_action : int;
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mutable lex_eof_reached : bool }
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type lex_tables =
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{ lex_base: string;
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lex_backtrk: string;
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lex_default: string;
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lex_trans: string;
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lex_check: string }
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external engine: lex_tables -> int -> lexbuf -> int = "lex_engine"
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let lex_refill read_fun aux_buffer lexbuf =
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let read =
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read_fun aux_buffer (String.length aux_buffer) in
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let n =
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if read > 0
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then read
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else (lexbuf.lex_eof_reached <- true; 0) in
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if lexbuf.lex_start_pos < n then begin
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let oldlen = lexbuf.lex_buffer_len in
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let newlen = oldlen * 2 in
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let newbuf = String.create newlen in
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String.unsafe_blit lexbuf.lex_buffer 0 newbuf oldlen oldlen;
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lexbuf.lex_buffer <- newbuf;
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lexbuf.lex_buffer_len <- newlen;
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lexbuf.lex_abs_pos <- lexbuf.lex_abs_pos - oldlen;
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lexbuf.lex_curr_pos <- lexbuf.lex_curr_pos + oldlen;
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lexbuf.lex_start_pos <- lexbuf.lex_start_pos + oldlen;
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lexbuf.lex_last_pos <- lexbuf.lex_last_pos + oldlen
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end;
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String.unsafe_blit lexbuf.lex_buffer n
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lexbuf.lex_buffer 0
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(lexbuf.lex_buffer_len - n);
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String.unsafe_blit aux_buffer 0
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lexbuf.lex_buffer (lexbuf.lex_buffer_len - n)
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n;
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lexbuf.lex_abs_pos <- lexbuf.lex_abs_pos + n;
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lexbuf.lex_curr_pos <- lexbuf.lex_curr_pos - n;
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lexbuf.lex_start_pos <- lexbuf.lex_start_pos - n;
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lexbuf.lex_last_pos <- lexbuf.lex_last_pos - n
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let from_function f =
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{ refill_buff = lex_refill f (String.create 512);
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lex_buffer = String.create 1024;
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lex_buffer_len = 1024;
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lex_abs_pos = - 1024;
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lex_start_pos = 1024;
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lex_curr_pos = 1024;
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lex_last_pos = 1024;
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lex_last_action = 0;
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lex_eof_reached = false }
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let from_channel ic =
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from_function (fun buf n -> input ic buf 0 n)
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let from_string s =
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{ refill_buff = (fun lexbuf -> lexbuf.lex_eof_reached <- true);
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lex_buffer = s ^ "";
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lex_buffer_len = String.length s;
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lex_abs_pos = 0;
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lex_start_pos = 0;
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lex_curr_pos = 0;
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lex_last_pos = 0;
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lex_last_action = 0;
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lex_eof_reached = true }
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let lexeme lexbuf =
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let len = lexbuf.lex_curr_pos - lexbuf.lex_start_pos in
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let s = String.create len in
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String.unsafe_blit lexbuf.lex_buffer lexbuf.lex_start_pos s 0 len;
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s
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let lexeme_char lexbuf i =
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String.get lexbuf.lex_buffer (lexbuf.lex_start_pos + i)
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let lexeme_start lexbuf =
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lexbuf.lex_abs_pos + lexbuf.lex_start_pos
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and lexeme_end lexbuf =
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lexbuf.lex_abs_pos + lexbuf.lex_curr_pos
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