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|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glk/adrift/scare.h"
#include "glk/adrift/scprotos.h"
#include "glk/adrift/scgamest.h"
namespace Glk {
namespace Adrift {
/* Assorted definitions and constants. */
enum { MAX_NESTING_DEPTH = 32 };
static const sc_char NUL = '\0';
/* Trace flag, set before running. */
static sc_bool restr_trace = FALSE;
/*
* restr_integer_variable()
*
* Return the index of the n'th integer found.
*/
static sc_int
restr_integer_variable (sc_gameref_t game, sc_int n)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
sc_vartype_t vt_key[3];
sc_int var_count, var, count;
/* Get the count of variables. */
vt_key[0].string = "Variables";
var_count = prop_get_child_count (bundle, "I<-s", vt_key);
/* Progress through variables until n integers found. */
count = n;
for (var = 0; var < var_count && count >= 0; var++)
{
sc_int type;
vt_key[1].integer = var;
vt_key[2].string = "Type";
type = prop_get_integer (bundle, "I<-sis", vt_key);
if (type == TAFVAR_NUMERIC)
count--;
}
return var - 1;
}
/*
* restr_object_in_place()
*
* Is object in a certain place, state, or condition.
*/
static sc_bool
restr_object_in_place (sc_gameref_t game,
sc_int object, sc_int var2, sc_int var3)
{
const sc_var_setref_t vars = gs_get_vars (game);
sc_int npc;
if (restr_trace)
{
sc_trace ("Restr: checking"
" object in place, %ld, %ld, %ld\n", object, var2, var3);
}
/* Var2 controls what we do. */
switch (var2)
{
case 0:
case 6: /* In room */
if (var3 == 0)
return gs_object_position (game, object) == OBJ_HIDDEN;
else
return gs_object_position (game, object) == var3;
case 1:
case 7: /* Held by */
if (var3 == 0) /* Player */
return gs_object_position (game, object) == OBJ_HELD_PLAYER;
else if (var3 == 1) /* Ref character */
npc = var_get_ref_character (vars);
else
npc = var3 - 2;
return gs_object_position (game, object) == OBJ_HELD_NPC
&& gs_object_parent (game, object) == npc;
case 2:
case 8: /* Worn by */
if (var3 == 0) /* Player */
return gs_object_position (game, object) == OBJ_WORN_PLAYER;
else if (var3 == 1) /* Ref character */
npc = var_get_ref_character (vars);
else
npc = var3 - 2;
return gs_object_position (game, object) == OBJ_WORN_NPC
&& gs_object_parent (game, object) == npc;
case 3:
case 9: /* Visible to */
if (var3 == 0) /* Player */
return obj_indirectly_in_room (game,
object, gs_playerroom (game));
else if (var3 == 1) /* Ref character */
npc = var_get_ref_character (vars);
else
npc = var3 - 2;
return obj_indirectly_in_room (game, object,
gs_npc_location (game, npc) - 1);
case 4:
case 10: /* Inside */
if (var3 == 0) /* Nothing? */
return gs_object_position (game, object) != OBJ_IN_OBJECT;
return gs_object_position (game, object) == OBJ_IN_OBJECT
&& gs_object_parent (game, object) == obj_container_object (game,
var3 - 1);
case 5:
case 11: /* On top of */
if (var3 == 0) /* Nothing? */
return gs_object_position (game, object) != OBJ_ON_OBJECT;
return gs_object_position (game, object) == OBJ_ON_OBJECT
&& gs_object_parent (game, object) == obj_surface_object (game,
var3 - 1);
default:
sc_fatal ("restr_object_in_place: bad var2, %ld\n", var2);
return FALSE;
}
}
/*
* restr_pass_task_object_location()
*
* Evaluate restrictions relating to object location.
*/
static sc_bool
restr_pass_task_object_location (sc_gameref_t game,
sc_int var1, sc_int var2, sc_int var3)
{
const sc_var_setref_t vars = gs_get_vars (game);
sc_bool should_be;
sc_int object;
if (restr_trace)
{
sc_trace ("Restr: running object"
" location restriction, %ld, %ld, %ld\n", var1, var2, var3);
}
/* Initialize variables to avoid gcc warnings. */
should_be = FALSE;
object = -1;
/* See how things should look. */
if (var2 >= 0 && var2 < 6)
should_be = TRUE;
else if (var2 >= 6 && var2 < 12)
should_be = FALSE;
else
sc_fatal ("restr_pass_task_object_location: bad var2, %ld\n", var2);
/* Now find the addressed object. */
if (var1 == 0)
{
object = -1; /* No object */
should_be = !should_be;
}
else if (var1 == 1)
object = -1; /* Any object */
else if (var1 == 2)
object = var_get_ref_object (vars);
else if (var1 >= 3)
object = obj_dynamic_object (game, var1 - 3);
else
sc_fatal ("restr_pass_task_object_location: bad var1, %ld\n", var1);
/*
* Here it seems that we have to special case static objects that may have
* crept in through the referenced object. The object in place function
* isn't built to handle these.
*
* TODO What is the meaning of applying object restrictions to static
* objects?
*/
if (var1 == 2 && object != -1 && obj_is_static (game, object))
{
if (restr_trace)
{
sc_trace ("Restr:"
" restriction object %ld is static, rejecting\n", object);
}
return FALSE;
}
/* Try to put it all together. */
if (object == -1)
{
sc_int target;
for (target = 0; target < gs_object_count (game); target++)
{
if (restr_object_in_place (game, target, var2, var3))
return should_be;
}
return !should_be;
}
return should_be == restr_object_in_place (game, object, var2, var3);
}
/*
* restr_pass_task_object_state()
*
* Evaluate restrictions relating to object states. This function is called
* from the library by lib_pass_alt_room(), so cannot be static.
*/
sc_bool
restr_pass_task_object_state (sc_gameref_t game, sc_int var1, sc_int var2)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
const sc_var_setref_t vars = gs_get_vars (game);
sc_vartype_t vt_key[3];
sc_int object, openable, key;
if (restr_trace)
{
sc_trace ("Restr:"
" running object state restriction, %ld, %ld\n", var1, var2);
}
/* Find the object being addressed. */
if (var1 == 0)
object = var_get_ref_object (vars);
else
object = obj_stateful_object (game, var1 - 1);
/* We're interested only in openable objects. */
vt_key[0].string = "Objects";
vt_key[1].integer = object;
vt_key[2].string = "Openable";
openable = prop_get_integer (bundle, "I<-sis", vt_key);
if (openable > 0)
{
/* Is this object lockable? */
vt_key[2].string = "Key";
key = prop_get_integer (bundle, "I<-sis", vt_key);
if (key >= 0)
{
if (var2 <= 2)
return gs_object_openness (game, object) == var2 + 5;
else
return gs_object_state (game, object) == var2 - 2;
}
else
{
if (var2 <= 1)
return gs_object_openness (game, object) == var2 + 5;
else
return gs_object_state (game, object) == var2 - 1;
}
}
else
return gs_object_state (game, object) == var2 + 1;
}
/*
* restr_pass_task_task_state()
*
* Evaluate restrictions relating to task states.
*/
static sc_bool
restr_pass_task_task_state (sc_gameref_t game, sc_int var1, sc_int var2)
{
sc_bool should_be;
if (restr_trace)
sc_trace ("Restr: running task restriction, %ld, %ld\n", var1, var2);
/* Initialize variables to avoid gcc warnings. */
should_be = FALSE;
/* See if the task should be done or not done. */
if (var2 == 0)
should_be = TRUE;
else if (var2 == 1)
should_be = FALSE;
else
sc_fatal ("restr_pass_task_task_state: bad var2, %ld\n", var2);
/* Check all tasks? */
if (var1 == 0)
{
sc_int task;
for (task = 0; task < gs_task_count (game); task++)
{
if (gs_task_done (game, task) == should_be)
return FALSE;
}
return TRUE;
}
/* Check just the given task. */
return gs_task_done (game, var1 - 1) == should_be;
}
/*
* restr_pass_task_char()
*
* Evaluate restrictions relating to player and NPCs.
*/
static sc_bool
restr_pass_task_char (sc_gameref_t game, sc_int var1, sc_int var2, sc_int var3)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
const sc_var_setref_t vars = gs_get_vars (game);
sc_int npc1, npc2;
if (restr_trace)
{
sc_trace ("Restr:"
" running char restriction, %ld, %ld, %ld\n", var1, var2, var3);
}
/* Handle var2 types 1 and 2. */
if (var2 == 1) /* Not in same room as */
return !restr_pass_task_char (game, var1, 0, var3);
else if (var2 == 2) /* Alone */
return !restr_pass_task_char (game, var1, 3, var3);
/* Decode NPC number, -1 if none. */
npc1 = npc2 = -1;
if (var1 == 1)
npc1 = var_get_ref_character (vars);
else if (var1 > 1)
npc1 = var1 - 2;
/* Player or NPC? */
if (var1 == 0)
{
sc_vartype_t vt_key[2];
sc_int gender;
/* Player -- decode based on var2. */
switch (var2)
{
case 0: /* In same room as */
if (var3 == 1)
npc2 = var_get_ref_character (vars);
else if (var3 > 1)
npc2 = var3 - 2;
if (var3 == 0) /* Player */
return TRUE;
else
return npc_in_room (game, npc2, gs_playerroom (game));
case 3: /* Not alone */
return npc_count_in_room (game, gs_playerroom (game)) > 1;
case 4: /* Standing on */
return gs_playerposition (game) == 0
&& gs_playerparent (game) == obj_standable_object (game,
var3 - 1);
case 5: /* Sitting on */
return gs_playerposition (game) == 1
&& gs_playerparent (game) == obj_standable_object (game,
var3 - 1);
case 6: /* Lying on */
return gs_playerposition (game) == 2
&& gs_playerparent (game) == obj_lieable_object (game,
var3 - 1);
case 7: /* Player gender */
vt_key[0].string = "Globals";
vt_key[1].string = "PlayerGender";
gender = prop_get_integer (bundle, "I<-ss", vt_key);
return gender == var3;
default:
sc_fatal ("restr_pass_task_char: invalid type, %ld\n", var2);
return FALSE;
}
}
else
{
sc_vartype_t vt_key[3];
sc_int gender;
/* NPC -- decode based on var2. */
switch (var2)
{
case 0: /* In same room as */
if (var3 == 0)
return npc_in_room (game, npc1, gs_playerroom (game));
if (var3 == 1)
npc2 = var_get_ref_character (vars);
else if (var3 > 1)
npc2 = var3 - 2;
return npc_in_room (game, npc1, gs_npc_location (game, npc2) - 1);
case 3: /* Not alone */
return npc_count_in_room (game, gs_npc_location (game, npc1) - 1) > 1;
case 4: /* Standing on */
return gs_npc_position (game, npc1) == 0
&& gs_playerparent (game) == obj_standable_object (game, var3);
case 5: /* Sitting on */
return gs_npc_position (game, npc1) == 1
&& gs_playerparent (game) == obj_standable_object (game, var3);
case 6: /* Lying on */
return gs_npc_position (game, npc1) == 2
&& gs_playerparent (game) == obj_lieable_object (game, var3);
case 7: /* NPC gender */
vt_key[0].string = "NPCs";
vt_key[1].integer = npc1;
vt_key[2].string = "Gender";
gender = prop_get_integer (bundle, "I<-sis", vt_key);
return gender == var3;
default:
sc_fatal ("restr_pass_task_char: invalid type, %ld\n", var2);
return FALSE;
}
}
}
/*
* restr_pass_task_int_var()
*
* Helper for restr_pass_task_var(), handles integer variable restrictions.
*/
static sc_bool
restr_pass_task_int_var (sc_gameref_t game,
sc_int var2, sc_int var3, sc_int value)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
const sc_var_setref_t vars = gs_get_vars (game);
sc_vartype_t vt_key[3];
sc_int value2;
if (restr_trace)
{
sc_trace ("Restr: running"
" integer var restriction, %ld, %ld, %ld\n", var2, var3, value);
}
/* Compare against var3 if that's what var2 says. */
switch (var2)
{
case 0:
return value < var3;
case 1:
return value <= var3;
case 2:
return value == var3;
case 3:
return value >= var3;
case 4:
return value > var3;
case 5:
return value != var3;
default:
/*
* Compare against the integer var numbered in var3 - 1, or the
* referenced number if var3 is zero. Make sure that we're comparing
* integer variables.
*/
if (var3 == 0)
value2 = var_get_ref_number (vars);
else
{
const sc_char *name;
sc_int ivar, type;
ivar = restr_integer_variable (game, var3 - 1);
vt_key[0].string = "Variables";
vt_key[1].integer = ivar;
vt_key[2].string = "Name";
name = prop_get_string (bundle, "S<-sis", vt_key);
vt_key[2].string = "Type";
type = prop_get_integer (bundle, "I<-sis", vt_key);
if (type != TAFVAR_NUMERIC)
{
sc_fatal ("restr_pass_task_int_var:"
" non-integer in comparison, %s\n", name);
}
/* Get the value in variable numbered in var3 - 1. */
value2 = var_get_integer (vars, name);
}
switch (var2)
{
case 10:
return value < value2;
case 11:
return value <= value2;
case 12:
return value == value2;
case 13:
return value >= value2;
case 14:
return value > value2;
case 15:
return value != value2;
default:
sc_fatal ("restr_pass_task_int_var:"
" unknown int comparison, %ld\n", var2);
return FALSE;
}
}
}
/*
* restr_pass_task_string_var()
*
* Helper for restr_pass_task_var(), handles string variable restrictions.
*/
static sc_bool
restr_pass_task_string_var (sc_int var2,
const sc_char *var4, const sc_char *value)
{
if (restr_trace)
{
sc_trace ("Restr: running string"
" var restriction, %ld, \"%s\", \"%s\"\n", var2, var4, value);
}
/* Make comparison against var4 based on var2 value. */
switch (var2)
{
case 0:
return strcmp (value, var4) == 0; /* == */
case 1:
return strcmp (value, var4) != 0; /* != */
default:
sc_fatal ("restr_pass_task_string_var:"
" unknown string comparison, %ld\n", var2);
return FALSE;
}
}
/*
* restr_pass_task_var()
*
* Evaluate restrictions relating to variables.
*/
static sc_bool
restr_pass_task_var (sc_gameref_t game,
sc_int var1, sc_int var2, sc_int var3,
const sc_char *var4)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
const sc_var_setref_t vars = gs_get_vars (game);
sc_vartype_t vt_key[3];
sc_int type, value;
const sc_char *name, *string;
if (restr_trace)
{
sc_trace ("Restr: running var restriction,"
" %ld, %ld, %ld, \"%s\"\n", var1, var2, var3, var4);
}
/*
* For var1=0, compare against referenced number. For var1=1, compare
* against referenced text.
*/
if (var1 == 0)
{
value = var_get_ref_number (vars);
return restr_pass_task_int_var (game, var2, var3, value);
}
else if (var1 == 1)
{
string = var_get_ref_text (vars);
return restr_pass_task_string_var (var2, var4, string);
}
/* Get the name and type of the variable being addressed. */
vt_key[0].string = "Variables";
vt_key[1].integer = var1 - 2;
vt_key[2].string = "Name";
name = prop_get_string (bundle, "S<-sis", vt_key);
vt_key[2].string = "Type";
type = prop_get_integer (bundle, "I<-sis", vt_key);
/* Select first based on variable type. */
switch (type)
{
case TAFVAR_NUMERIC:
value = var_get_integer (vars, name);
return restr_pass_task_int_var (game, var2, var3, value);
case TAFVAR_STRING:
string = var_get_string (vars, name);
return restr_pass_task_string_var (var2, var4, string);
default:
sc_fatal ("restr_pass_task_var: invalid variable type, %ld\n", type);
return FALSE;
}
}
/*
* restr_pass_task_restriction()
*
* Demultiplexer for task restrictions.
*/
static sc_bool
restr_pass_task_restriction (sc_gameref_t game, sc_int task, sc_int restriction)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
sc_vartype_t vt_key[5];
sc_int type, var1, var2, var3;
const sc_char *var4;
sc_bool result = FALSE;
if (restr_trace)
{
sc_trace ("Restr:"
" evaluating task %ld restriction %ld\n", task, restriction);
}
/* Get the task restriction type. */
vt_key[0].string = "Tasks";
vt_key[1].integer = task;
vt_key[2].string = "Restrictions";
vt_key[3].integer = restriction;
vt_key[4].string = "Type";
type = prop_get_integer (bundle, "I<-sisis", vt_key);
/* Demultiplex depending on type. */
switch (type)
{
case 0: /* Object location. */
vt_key[4].string = "Var1";
var1 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var2";
var2 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var3";
var3 = prop_get_integer (bundle, "I<-sisis", vt_key);
result = restr_pass_task_object_location (game, var1, var2, var3);
break;
case 1: /* Object state. */
vt_key[4].string = "Var1";
var1 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var2";
var2 = prop_get_integer (bundle, "I<-sisis", vt_key);
result = restr_pass_task_object_state (game, var1, var2);
break;
case 2: /* Task state. */
vt_key[4].string = "Var1";
var1 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var2";
var2 = prop_get_integer (bundle, "I<-sisis", vt_key);
result = restr_pass_task_task_state (game, var1, var2);
break;
case 3: /* Player and NPCs. */
vt_key[4].string = "Var1";
var1 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var2";
var2 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var3";
var3 = prop_get_integer (bundle, "I<-sisis", vt_key);
result = restr_pass_task_char (game, var1, var2, var3);
break;
case 4: /* Variable. */
vt_key[4].string = "Var1";
var1 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var2";
var2 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var3";
var3 = prop_get_integer (bundle, "I<-sisis", vt_key);
vt_key[4].string = "Var4";
var4 = prop_get_string (bundle, "S<-sisis", vt_key);
result = restr_pass_task_var (game, var1, var2, var3, var4);
break;
default:
sc_fatal ("restr_pass_task_restriction:"
" unknown restriction type %ld\n", type);
}
if (restr_trace)
{
sc_trace ("Restr: task %ld restriction"
" %ld is %s\n", task, restriction, result ? "PASS" : "FAIL");
}
return result;
}
/* Enumeration of restrictions combination string tokens. */
enum
{ TOK_RESTRICTION = '#',
TOK_AND = 'A',
TOK_OR = 'O',
TOK_LPAREN = '(',
TOK_RPAREN = ')',
TOK_EOS = '\0'
};
/* #O#A(#O#)-style expression, for tokenizing. */
static const sc_char *restr_expression = NULL;
static sc_int restr_index = 0;
/*
* restr_tokenize_start()
* restr_tokenize_end()
*
* Start and wrap up restrictions combinations string tokenization.
*/
static void
restr_tokenize_start (const sc_char *expression)
{
/* Save expression, and restart index. */
restr_expression = expression;
restr_index = 0;
}
static void
restr_tokenize_end (void)
{
restr_expression = NULL;
restr_index = 0;
}
/*
* restr_next_token()
*
* Simple tokenizer for restrictions combination expressions.
*/
static sc_char
restr_next_token (void)
{
assert (restr_expression);
/* Find the next non-space, and return it. */
while (TRUE)
{
/* Return NUL if at string end. */
if (restr_expression[restr_index] == NUL)
return restr_expression[restr_index];
/* Spin on whitespace. */
restr_index++;
if (sc_isspace (restr_expression[restr_index - 1]))
continue;
/* Return the character just passed. */
return restr_expression[restr_index - 1];
}
}
/* Evaluation values stack. */
static sc_bool restr_eval_values[MAX_NESTING_DEPTH];
static sc_int restr_eval_stack = 0;
/*
* The restriction number to evaluate. This advances with each call to
* evaluate and stack a restriction result.
*/
static sc_int restr_eval_restriction = 0;
/* The current game used to evaluate restrictions, and the task in question. */
static sc_gameref_t restr_eval_game = NULL;
static sc_int restr_eval_task = 0;
/* The id of the lowest-indexed failing restriction. */
static sc_int restr_lowest_fail = -1;
/*
* restr_eval_start()
*
* Reset the evaluation stack to an empty state, and note the things we have
* to note for when we need to evaluate a restriction.
*/
static void
restr_eval_start (sc_gameref_t game, sc_int task)
{
/* Clear stack. */
restr_eval_stack = 0;
restr_eval_restriction = 0;
/* Note evaluation details. */
restr_eval_game = game;
restr_eval_task = task;
/* Clear lowest indexed failing restriction. */
restr_lowest_fail = -1;
}
/*
* restr_eval_push()
*
* Push a value onto the values stack.
*/
static void
restr_eval_push (sc_bool value)
{
if (restr_eval_stack >= MAX_NESTING_DEPTH)
sc_fatal ("restr_eval_push: stack overflow\n");
restr_eval_values[restr_eval_stack++] = value;
}
/*
* expr_restr_action()
*
* Evaluate the effect of an and/or into the values stack.
*/
static void
restr_eval_action (sc_char token)
{
/* Select action based on parsed token. */
switch (token)
{
/* Handle evaluating and pushing a restriction result. */
case TOK_RESTRICTION:
{
sc_bool result;
/* Evaluate and push the next restriction. */
result = restr_pass_task_restriction (restr_eval_game,
restr_eval_task,
restr_eval_restriction);
restr_eval_push (result);
/*
* If the restriction failed, and there isn't yet a first failing one
* set, note this one as the first to fail.
*/
if (restr_lowest_fail == -1 && !result)
restr_lowest_fail = restr_eval_restriction;
/* Increment restriction sequence identifier. */
restr_eval_restriction++;
break;
}
/* Handle cases of or-ing/and-ing restrictions. */
case TOK_OR:
case TOK_AND:
{
sc_bool val1, val2, result = FALSE;
assert (restr_eval_stack >= 2);
/* Get the top two stack values. */
val1 = restr_eval_values[restr_eval_stack - 2];
val2 = restr_eval_values[restr_eval_stack - 1];
/* Or, or and, into result. */
switch (token)
{
case TOK_OR:
result = val1 || val2;
break;
case TOK_AND:
result = val1 && val2;
break;
default:
sc_fatal ("restr_eval_action: bad token, '%c'\n", token);
}
/* Put result back at top of stack. */
restr_eval_stack--;
restr_eval_values[restr_eval_stack - 1] = result;
break;
}
default:
sc_fatal ("restr_eval_action: bad token, '%c'\n", token);
}
}
/*
* restr_eval_result()
*
* Return the top of the values stack as the evaluation result.
*/
static sc_int
restr_eval_result (sc_int *lowest_fail)
{
if (restr_eval_stack != 1)
sc_fatal ("restr_eval_result: values stack not completed\n");
*lowest_fail = restr_lowest_fail;
return restr_eval_values[0];
}
/* Parse error jump buffer. */
static jmp_buf restr_parse_error;
/* Single lookahead token for parser. */
static sc_char restr_lookahead = '\0';
/*
* restr_match()
*
* Match a token with an expectation.
*/
static void
restr_match (sc_char c)
{
if (restr_lookahead == c)
restr_lookahead = restr_next_token ();
else
{
sc_error ("restr_match:"
" syntax error, expected %d, got %d\n", c, restr_lookahead);
longjmp (restr_parse_error, 1);
}
}
/* Forward declaration for recursion. */
static void restr_bexpr (void);
/*
* restr_andexpr()
* restr_orexpr()
* restr_bexpr()
*
* Expression parsers. Here we go again...
*/
static void
restr_andexpr (void)
{
restr_bexpr ();
while (restr_lookahead == TOK_AND)
{
restr_match (TOK_AND);
restr_bexpr ();
restr_eval_action (TOK_AND);
}
}
static void
restr_orexpr (void)
{
restr_andexpr ();
while (restr_lookahead == TOK_OR)
{
restr_match (TOK_OR);
restr_andexpr ();
restr_eval_action (TOK_OR);
}
}
static void
restr_bexpr (void)
{
switch (restr_lookahead)
{
case TOK_RESTRICTION:
restr_match (TOK_RESTRICTION);
restr_eval_action (TOK_RESTRICTION);
break;
case TOK_LPAREN:
restr_match (TOK_LPAREN);
restr_orexpr ();
restr_match (TOK_RPAREN);
break;
default:
sc_error ("restr_bexpr: syntax error, unexpected %d\n", restr_lookahead);
longjmp (restr_parse_error, 1);
}
}
/*
* restr_get_fail_message()
*
* Get the FailMessage for the given task restriction; NULL if none.
*/
static const sc_char *
restr_get_fail_message (sc_gameref_t game, sc_int task, sc_int restriction)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
sc_vartype_t vt_key[5];
const sc_char *message;
/* Get the restriction message. */
vt_key[0].string = "Tasks";
vt_key[1].integer = task;
vt_key[2].string = "Restrictions";
vt_key[3].integer = restriction;
vt_key[4].string = "FailMessage";
message = prop_get_string (bundle, "S<-sisis", vt_key);
/* Return it, or NULL if empty. */
return !sc_strempty (message) ? message : NULL;
}
/*
* restr_debug_trace()
*
* Set restrictions tracing on/off.
*/
void
restr_debug_trace (sc_bool flag)
{
restr_trace = flag;
}
/*
* restr_eval_task_restrictions()
*
* Main handler for a given set of task restrictions. Returns TRUE in pass
* if the restrictions pass, FALSE if not. On FALSE pass returns, it also
* returns a fail message string from the restriction deemed to have caused
* the failure (that is, the first one with a FailMessage property), or NULL
* if no failing restriction has a FailMessage. The function's main return
* value is TRUE if restrictions parsed successfully, FALSE otherwise.
*/
sc_bool
restr_eval_task_restrictions (sc_gameref_t game,
sc_int task, sc_bool *pass,
const sc_char **fail_message)
{
const sc_prop_setref_t bundle = gs_get_bundle (game);
sc_vartype_t vt_key[3];
sc_int restr_count, lowest_fail;
const sc_char *pattern;
sc_bool result;
assert (pass && fail_message);
/* Get the count of restrictions on the task. */
vt_key[0].string = "Tasks";
vt_key[1].integer = task;
vt_key[2].string = "Restrictions";
restr_count = prop_get_child_count (bundle, "I<-sis", vt_key);
/* If none, stop now, acting as if all passed. */
if (restr_count == 0)
{
if (restr_trace)
sc_trace ("Restr: task %ld has no restrictions\n", task);
*pass = TRUE;
*fail_message = NULL;
return TRUE;
}
/* Get the task's restriction combination pattern. */
vt_key[2].string = "RestrMask";
pattern = prop_get_string (bundle, "S<-sis", vt_key);
if (restr_trace)
{
sc_trace ("Restr: task %ld"
" has %ld restrictions, %s\n", task, restr_count, pattern);
}
/* Set up the evaluation stack and tokenizer. */
restr_eval_start (game, task);
restr_tokenize_start (pattern);
/* Try parsing the pattern, and catch errors. */
if (setjmp (restr_parse_error) == 0)
{
/* Parse the pattern, and ensure it ends at string end. */
restr_lookahead = restr_next_token ();
restr_orexpr ();
restr_match (TOK_EOS);
}
else
{
/* Parse error -- clean up tokenizer and return fail. */
restr_tokenize_end ();
return FALSE;
}
/* Clean up tokenizer and get the evaluation result. */
restr_tokenize_end ();
result = restr_eval_result (&lowest_fail);
if (restr_trace)
{
sc_trace ("Restr: task %ld"
" restrictions %s\n", task, result ? "PASS" : "FAIL");
}
/*
* Return the result, and if a restriction fails, then return the
* FailMessage of the lowest indexed failing restriction (or NULL if this
* restriction has no FailMessage).
*
* Then return TRUE since parsing and running the restrictions succeeded
* (even if the restrictions themselves didn't).
*/
*pass = result;
if (result)
*fail_message = NULL;
else
*fail_message = restr_get_fail_message (game, task, lowest_fail);
return TRUE;
}
} // End of namespace Adrift
} // End of namespace Glk
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