ocaml-nox 4.01.0-5 / usr / lib / ocaml / parsing.ml

This file is indexed.

/usr/lib/ocaml/parsing.ml is in ocaml-nox 4.01.0-5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below. 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
(***********************************************************************)
(*                                                                     *)
(*                                OCaml                                *)
(*                                                                     *)
(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the GNU Library General Public License, with    *)
(*  the special exception on linking described in file ../LICENSE.     *)
(*                                                                     *)
(***********************************************************************)

(* The parsing engine *)

open Lexing

(* Internal interface to the parsing engine *)

type parser_env =
  { mutable s_stack : int array;        (* States *)
    mutable v_stack : Obj.t array;      (* Semantic attributes *)
    mutable symb_start_stack : position array; (* Start positions *)
    mutable symb_end_stack : position array;   (* End positions *)
    mutable stacksize : int;            (* Size of the stacks *)
    mutable stackbase : int;            (* Base sp for current parse *)
    mutable curr_char : int;            (* Last token read *)
    mutable lval : Obj.t;               (* Its semantic attribute *)
    mutable symb_start : position;      (* Start pos. of the current symbol*)
    mutable symb_end : position;        (* End pos. of the current symbol *)
    mutable asp : int;                  (* The stack pointer for attributes *)
    mutable rule_len : int;             (* Number of rhs items in the rule *)
    mutable rule_number : int;          (* Rule number to reduce by *)
    mutable sp : int;                   (* Saved sp for parse_engine *)
    mutable state : int;                (* Saved state for parse_engine *)
    mutable errflag : int }             (* Saved error flag for parse_engine *)

type parse_tables =
  { actions : (parser_env -> Obj.t) array;
    transl_const : int array;
    transl_block : int array;
    lhs : string;
    len : string;
    defred : string;
    dgoto : string;
    sindex : string;
    rindex : string;
    gindex : string;
    tablesize : int;
    table : string;
    check : string;
    error_function : string -> unit;
    names_const : string;
    names_block : string }

exception YYexit of Obj.t
exception Parse_error

type parser_input =
    Start
  | Token_read
  | Stacks_grown_1
  | Stacks_grown_2
  | Semantic_action_computed
  | Error_detected

type parser_output =
    Read_token
  | Raise_parse_error
  | Grow_stacks_1
  | Grow_stacks_2
  | Compute_semantic_action
  | Call_error_function

(* to avoid warnings *)
let _ = [Read_token; Raise_parse_error; Grow_stacks_1; Grow_stacks_2;
         Compute_semantic_action; Call_error_function]

external parse_engine :
    parse_tables -> parser_env -> parser_input -> Obj.t -> parser_output
    = "caml_parse_engine"

external set_trace: bool -> bool
    = "caml_set_parser_trace"

let env =
  { s_stack = Array.create 100 0;
    v_stack = Array.create 100 (Obj.repr ());
    symb_start_stack = Array.create 100 dummy_pos;
    symb_end_stack = Array.create 100 dummy_pos;
    stacksize = 100;
    stackbase = 0;
    curr_char = 0;
    lval = Obj.repr ();
    symb_start = dummy_pos;
    symb_end = dummy_pos;
    asp = 0;
    rule_len = 0;
    rule_number = 0;
    sp = 0;
    state = 0;
    errflag = 0 }

let grow_stacks() =
  let oldsize = env.stacksize in
  let newsize = oldsize * 2 in
  let new_s = Array.create newsize 0
  and new_v = Array.create newsize (Obj.repr ())
  and new_start = Array.create newsize dummy_pos
  and new_end = Array.create newsize dummy_pos in
    Array.blit env.s_stack 0 new_s 0 oldsize;
    env.s_stack <- new_s;
    Array.blit env.v_stack 0 new_v 0 oldsize;
    env.v_stack <- new_v;
    Array.blit env.symb_start_stack 0 new_start 0 oldsize;
    env.symb_start_stack <- new_start;
    Array.blit env.symb_end_stack 0 new_end 0 oldsize;
    env.symb_end_stack <- new_end;
    env.stacksize <- newsize

let clear_parser() =
  Array.fill env.v_stack 0 env.stacksize (Obj.repr ());
  env.lval <- Obj.repr ()

let current_lookahead_fun = ref (fun (x : Obj.t) -> false)

let yyparse tables start lexer lexbuf =
  let rec loop cmd arg =
    match parse_engine tables env cmd arg with
      Read_token ->
        let t = Obj.repr(lexer lexbuf) in
        env.symb_start <- lexbuf.lex_start_p;
        env.symb_end <- lexbuf.lex_curr_p;
        loop Token_read t
    | Raise_parse_error ->
        raise Parse_error
    | Compute_semantic_action ->
        let (action, value) =
          try
            (Semantic_action_computed, tables.actions.(env.rule_number) env)
          with Parse_error ->
            (Error_detected, Obj.repr ()) in
        loop action value
    | Grow_stacks_1 ->
        grow_stacks(); loop Stacks_grown_1 (Obj.repr ())
    | Grow_stacks_2 ->
        grow_stacks(); loop Stacks_grown_2 (Obj.repr ())
    | Call_error_function ->
        tables.error_function "syntax error";
        loop Error_detected (Obj.repr ()) in
  let init_asp = env.asp
  and init_sp = env.sp
  and init_stackbase = env.stackbase
  and init_state = env.state
  and init_curr_char = env.curr_char
  and init_lval = env.lval
  and init_errflag = env.errflag in
  env.stackbase <- env.sp + 1;
  env.curr_char <- start;
  env.symb_end <- lexbuf.lex_curr_p;
  try
    loop Start (Obj.repr ())
  with exn ->
    let curr_char = env.curr_char in
    env.asp <- init_asp;
    env.sp <- init_sp;
    env.stackbase <- init_stackbase;
    env.state <- init_state;
    env.curr_char <- init_curr_char;
    env.lval <- init_lval;
    env.errflag <- init_errflag;
    match exn with
      YYexit v ->
        Obj.magic v
    | _ ->
        current_lookahead_fun :=
          (fun tok ->
            if Obj.is_block tok
            then tables.transl_block.(Obj.tag tok) = curr_char
            else tables.transl_const.(Obj.magic tok) = curr_char);
        raise exn

let peek_val env n =
  Obj.magic env.v_stack.(env.asp - n)

let symbol_start_pos () =
  let rec loop i =
    if i <= 0 then env.symb_end_stack.(env.asp)
    else begin
      let st = env.symb_start_stack.(env.asp - i + 1) in
      let en = env.symb_end_stack.(env.asp - i + 1) in
      if st <> en then st else loop (i - 1)
    end
  in
  loop env.rule_len
;;
let symbol_end_pos () = env.symb_end_stack.(env.asp);;
let rhs_start_pos n = env.symb_start_stack.(env.asp - (env.rule_len - n));;
let rhs_end_pos n = env.symb_end_stack.(env.asp - (env.rule_len - n));;

let symbol_start () = (symbol_start_pos ()).pos_cnum;;
let symbol_end () = (symbol_end_pos ()).pos_cnum;;
let rhs_start n = (rhs_start_pos n).pos_cnum;;
let rhs_end n = (rhs_end_pos n).pos_cnum;;

let is_current_lookahead tok =
  (!current_lookahead_fun)(Obj.repr tok)

let parse_error (msg : string) = ()

APT Browse - Built by Thomas Orozco.