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/* Copyright (C) 1992, 1996, 1998 Aladdin Enterprises. All rights reserved.
This software is licensed to a single customer by Artifex Software Inc.
under the terms of a specific OEM agreement.
*/
/*$RCSfile$ $Revision$ */
/* Token scanner state and interface */
/* Requires gsstruct.h, ostack.h, stream.h */
#ifndef iscan_INCLUDED
# define iscan_INCLUDED
#include "sa85x.h"
#include "sstring.h"
/*
* Define the state of the scanner. Before calling scan_token initially,
* the caller must initialize the state by calling scanner_state_init.
* Most of the state is only used if scanning is suspended because of
* an interrupt or a callout.
*
* We expose the entire state definition to the caller so that
* the state can normally be allocated on the stack.
*/
typedef struct scanner_state_s scanner_state;
/*
* Define a structure for dynamically growable strings.
* If is_dynamic is true, base/next/limit point to a string on the heap;
* if is_dynamic is false, base/next/limit point either to the local buffer
* or (only while control is inside scan_token) into the source stream buffer.
*/
#define max_comment_line 255 /* max size of an externally processable comment */
#define max_dsc_line max_comment_line /* backward compatibility */
#define da_buf_size (max_comment_line + 2)
typedef struct dynamic_area_s {
byte *base;
byte *next;
byte *limit;
bool is_dynamic;
byte buf[da_buf_size]; /* initial buffer */
gs_memory_t *memory;
} dynamic_area;
#define da_size(pda) ((uint)((pda)->limit - (pda)->base))
typedef dynamic_area *da_ptr;
/* Define state specific to binary tokens and binary object sequences. */
typedef struct scan_binary_state_s {
int num_format;
int (*cont)(P4(i_ctx_t *, stream *, ref *, scanner_state *));
ref bin_array;
uint index;
uint max_array_index; /* largest legal index in objects */
uint min_string_index; /* smallest legal index in strings */
uint top_size;
uint size;
} scan_binary_state;
/* Define the scanner state. */
struct scanner_state_s {
uint s_pstack; /* stack depth when starting current */
/* procedure, after pushing old pstack */
uint s_pdepth; /* pstack for very first { encountered, */
/* for error recovery */
bool s_from_string; /* true if string is source of data */
/* (for Level 1 `\' handling) */
bool s_check_only; /* true if just checking for syntax errors */
/* and complete statements (no value) */
enum {
scanning_none,
scanning_binary,
scanning_comment,
scanning_name,
scanning_string
} s_scan_type;
dynamic_area s_da;
union sss_ { /* scanning sub-state */
scan_binary_state binary; /* binary */
struct sns_ { /* name */
int s_name_type; /* number of /'s preceding a name */
bool s_try_number; /* true if should try scanning name */
/* as number */
} s_name;
stream_state st; /* string */
stream_A85D_state a85d; /* string */
stream_AXD_state axd; /* string */
stream_PSSD_state pssd; /* string */
} s_ss;
};
/* The type descriptor is public only for checking. */
extern_st(st_scanner_state);
#define public_st_scanner_state() /* in iscan.c */\
gs_public_st_complex_only(st_scanner_state, scanner_state, "scanner state",\
scanner_clear_marks, scanner_enum_ptrs, scanner_reloc_ptrs, 0)
#define scanner_state_init_check(pstate, from_string, check_only)\
((pstate)->s_scan_type = scanning_none,\
(pstate)->s_pstack = 0,\
(pstate)->s_from_string = from_string,\
(pstate)->s_check_only = check_only)
#define scanner_state_init(pstate, from_string)\
scanner_state_init_check(pstate, from_string, false)
/*
* Read a token from a stream. As usual, 0 is a normal return,
* <0 is an error. There are also three special return codes:
*/
#define scan_BOS 1 /* binary object sequence */
#define scan_EOF 2 /* end of stream */
#define scan_Refill 3 /* get more input data, then call again */
int scan_token(P4(i_ctx_t *i_ctx_p, stream * s, ref * pref,
scanner_state * pstate));
/*
* Read a token from a string. Return like scan_token, but also
* update the string to move past the token (if no error).
*/
int scan_string_token(P3(i_ctx_t *i_ctx_p, ref * pstr, ref * pref));
/*
* Handle a scan_Refill return from scan_token.
* This may return o_push_estack, 0 (meaning just call scan_token again),
* or an error code.
*/
int scan_handle_refill(P6(i_ctx_t *i_ctx_p, const ref * fop,
scanner_state * pstate, bool save, bool push_file,
op_proc_t cont));
/*
* Define the procedure "hook" for parsing DSC comments. If not NULL,
* this procedure is called for every DSC comment seen by the scanner.
*/
extern int (*scan_dsc_proc) (P2(const byte *, uint));
/*
* Define the procedure "hook" for parsing general comments. If not NULL,
* this procedure is called for every comment seen by the scanner.
* If both scan_dsc_proc and scan_comment_proc are set,
* scan_comment_proc is called only for non-DSC comments.
*/
extern int (*scan_comment_proc) (P2(const byte *, uint));
#endif /* iscan_INCLUDED */
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