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// -*- C++ -*-
/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
*
* mtsm.h
*
* written by Gaius Mulley (gaius@glam.ac.uk)
*
* provides a minimal troff state machine which is necessary to
* emit meta tags for the post-grohtml device driver.
*/
/*
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or
(at your option) any later version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
struct int_value {
int value;
int is_known;
int_value();
~int_value();
void diff(FILE *, const char *, int_value);
int differs(int_value);
void set(int);
void unset();
void set_if_unknown(int);
};
struct bool_value : public int_value {
bool_value();
~bool_value();
void diff(FILE *, const char *, bool_value);
};
struct units_value : public int_value {
units_value();
~units_value();
void diff(FILE *, const char *, units_value);
int differs(units_value);
void set(hunits);
};
struct string_value {
string value;
int is_known;
string_value();
~string_value();
void diff(FILE *, const char *, string_value);
int differs(string_value);
void set(string);
void unset();
};
enum bool_value_state {
MTSM_EOL,
MTSM_BR,
LAST_BOOL
};
enum int_value_state {
MTSM_FI,
MTSM_RJ,
MTSM_CE,
MTSM_SP,
LAST_INT
};
enum units_value_state {
MTSM_IN,
MTSM_LL,
MTSM_PO,
MTSM_TI,
LAST_UNITS
};
enum string_value_state {
MTSM_TA,
LAST_STRING
};
struct statem {
#if defined(DEBUGGING)
int issue_no;
#endif
bool_value bool_values[LAST_BOOL];
int_value int_values[LAST_INT];
units_value units_values[LAST_UNITS];
string_value string_values[LAST_STRING];
statem();
statem(statem *);
~statem();
void flush(FILE *, statem *);
int changed(statem *);
void merge(statem *, statem *);
void add_tag(int_value_state, int);
void add_tag(bool_value_state);
void add_tag(units_value_state, hunits);
void add_tag(string_value_state, string);
void sub_tag_ce();
void add_tag_if_unknown(int_value_state, int);
void add_tag_ta();
void display_state();
void update(statem *, statem *, int_value_state);
void update(statem *, statem *, bool_value_state);
void update(statem *, statem *, units_value_state);
void update(statem *, statem *, string_value_state);
};
struct stack {
stack *next;
statem *state;
stack();
stack(statem *, stack *);
~stack();
};
class mtsm {
statem *driver;
stack *sp;
int has_changed(int_value_state, statem *);
int has_changed(bool_value_state, statem *);
int has_changed(units_value_state, statem *);
int has_changed(string_value_state, statem *);
void inherit(statem *, int);
public:
mtsm();
~mtsm();
void push_state(statem *);
void pop_state();
void flush(FILE *, statem *, string);
int changed(statem *);
void add_tag(FILE *, string);
};
class state_set {
int boolset;
int intset;
int unitsset;
int stringset;
public:
state_set();
~state_set();
void incl(bool_value_state);
void incl(int_value_state);
void incl(units_value_state);
void incl(string_value_state);
void excl(bool_value_state);
void excl(int_value_state);
void excl(units_value_state);
void excl(string_value_state);
int is_in(bool_value_state);
int is_in(int_value_state);
int is_in(units_value_state);
int is_in(string_value_state);
void add(units_value_state, int);
units val(units_value_state);
};
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