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exprtree.c
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/*
* exprtree.c
*
* MathMap
*
* Copyright (C) 1997-2009 Mark Probst
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "exprtree.h"
#include "userval.h"
#include "builtins/builtins.h"
#include "tags.h"
#include "internals.h"
#include "macros.h"
#include "overload.h"
#include "mathmap.h"
#include "jump.h"
#define MAX_GENSYM_LEN 64
char error_string[1024];
scanner_region_t error_region;
static char*
gensym (char *buf)
{
static int index = 0;
sprintf(buf, "___tmp___%d___", index++);
return buf;
}
static arg_decl_t*
make_arg_decl (int type, scanner_ident_t *name, scanner_ident_t *docstring, option_t *options)
{
arg_decl_t *arg = (arg_decl_t*)malloc(sizeof(arg_decl_t));
assert(arg != 0);
arg->type = type;
arg->name = strdup(name->str);
assert(arg->name != 0);
if (docstring != NULL)
{
arg->docstring = strdup(docstring->str);
assert(arg->docstring != NULL);
}
else
arg->docstring = NULL;
arg->options = options;
arg->region = name->region;
arg->next = 0;
return arg;
}
arg_decl_t*
make_simple_arg_decl (int type, scanner_ident_t *name, scanner_ident_t *docstring, option_t *options)
{
arg_decl_t *arg_decl = make_arg_decl(type, name, docstring, options);
if (type == ARG_TYPE_INT)
{
arg_decl->v.integer.have_limits = 0;
arg_decl->v.integer.default_value = 0;
}
else if (type == ARG_TYPE_FLOAT)
{
arg_decl->v.floating.have_limits = 0;
arg_decl->v.floating.default_value = 0.0;
}
else if (type == ARG_TYPE_BOOL)
arg_decl->v.boolean.default_value = 0;
return arg_decl;
}
arg_decl_t*
make_filter_arg_decl (scanner_ident_t *name, arg_decl_t *args, scanner_ident_t *docstring, option_t *options)
{
arg_decl_t *arg = make_arg_decl(ARG_TYPE_FILTER, name, docstring, options);
arg->v.filter.args = args;
return arg;
}
arg_decl_t*
arg_decl_list_append (arg_decl_t *list1, arg_decl_t *list2)
{
arg_decl_t *list = list1;
if (list1 == 0)
return list2;
while (list->next != 0)
list = list->next;
list->next = list2;
return list1;
}
void
free_arg_decls (arg_decl_t *list)
{
while (list != 0)
{
arg_decl_t *next = list->next;
free(list->name);
if (list->docstring != 0)
free(list->docstring);
if (list->type == ARG_TYPE_FILTER)
free_arg_decls(list->v.filter.args);
free(list);
list = next;
}
}
static top_level_decl_t*
make_top_level_decl (int type, scanner_ident_t *name, scanner_ident_t *docstring)
{
top_level_decl_t *top_level = (top_level_decl_t*)malloc(sizeof(top_level_decl_t));
assert(top_level != NULL);
top_level->type = type;
top_level->name = strdup(name->str);
assert(top_level->name != NULL);
top_level->region = name->region;
if (docstring != NULL)
{
top_level->docstring = strdup(docstring->str);
assert(top_level->docstring != NULL);
}
else
top_level->docstring = NULL;
return top_level;
}
top_level_decl_t*
make_filter_decl (scanner_ident_t *name, scanner_ident_t *docstring, arg_decl_t *args, option_t *options)
{
top_level_decl_t *top_level = make_top_level_decl(TOP_LEVEL_FILTER, name, docstring);
top_level->v.filter.args = args;
top_level->v.filter.options = options;
top_level->v.filter.body = NULL; /* will be filled in by parser */
return top_level;
}
void
free_top_level_decl (top_level_decl_t *list)
{
free(list->name);
if (list->docstring != 0)
free(list->docstring);
if (list->type == TOP_LEVEL_FILTER)
{
free_arg_decls(list->v.filter.args);
free_exprtree(list->v.filter.body);
}
else
assert(0);
free(list);
}
option_t*
make_option (scanner_ident_t *name, option_t *suboptions)
{
option_t *option = (option_t*)malloc(sizeof(option_t));
assert(option != 0);
option->name = strdup(name->str);
assert(option->name != 0);
option->suboptions = suboptions;
option->next = 0;
return option;
}
option_t*
options_append (option_t *o1, option_t *o2)
{
if (o1 == 0)
return o2;
else
{
option_t *o = o1;
while (o1->next != 0)
o1 = o1->next;
o1->next = o2;
return o;
}
}
option_t*
find_option_with_name (option_t *options, const char *name)
{
while (options != 0)
{
if (strcmp(options->name, name) == 0)
return options;
options = options->next;
}
return 0;
}
static limits_t*
alloc_limits (int type)
{
limits_t *limits = (limits_t*)malloc(sizeof(limits_t));
assert(limits != 0);
limits->type = type;
return limits;
}
limits_t*
make_int_limits (exprtree *min_tree, exprtree *max_tree)
{
scanner_region_t region = scanner_region_merge (min_tree->region, max_tree->region);
limits_t *limits;
int min, max;
g_assert(min_tree->type == EXPR_INT_CONST && max_tree->type == EXPR_INT_CONST);
min = min_tree->val.int_const;
max = max_tree->val.int_const;
if (min >= max)
{
strcpy(error_string, _("Lower limit must be less than upper limit"));
error_region = region;
JUMP(1);
}
limits = alloc_limits(LIMITS_INT);
limits->region = region;
limits->v.integer.min = min;
limits->v.integer.max = max;
return limits;
}
limits_t*
make_float_limits (exprtree *min_tree, exprtree *max_tree)
{
scanner_region_t region = scanner_region_merge (min_tree->region, max_tree->region);
limits_t *limits;
float min, max;
g_assert((min_tree->type == EXPR_INT_CONST || min_tree->type == EXPR_FLOAT_CONST) &&
(max_tree->type == EXPR_INT_CONST || max_tree->type == EXPR_FLOAT_CONST));
if (min_tree->type == EXPR_INT_CONST)
min = (float)min_tree->val.int_const;
else
min = min_tree->val.float_const;
if (max_tree->type == EXPR_INT_CONST)
max = (float)max_tree->val.int_const;
else
max = max_tree->val.float_const;
if (min >= max)
{
strcpy(error_string, _("Lower limit must be less than upper limit"));
error_region = region;
JUMP(1);
}
limits = alloc_limits(LIMITS_FLOAT);
limits->region = region;
limits->v.floating.min = min;
limits->v.floating.max = max;
return limits;
}
void
free_limits (limits_t *limits)
{
free(limits);
}
void
apply_limits_to_arg_decl (arg_decl_t *arg_decl, limits_t *limits)
{
if (arg_decl->type == ARG_TYPE_INT)
{
if (limits->type != LIMITS_INT)
{
strcpy(error_string, _("Only integers can be limits for an int argument"));
error_region = limits->region;
JUMP(1);
}
arg_decl->v.integer.have_limits = 1;
arg_decl->v.integer.min = limits->v.integer.min;
arg_decl->v.integer.max = limits->v.integer.max;
arg_decl->v.integer.default_value = arg_decl->v.integer.min;
}
else if (arg_decl->type == ARG_TYPE_FLOAT)
{
float min = 0.0, max = 0.0;
if (limits->type == LIMITS_INT)
{
min = (float)limits->v.integer.min;
max = (float)limits->v.integer.max;
}
else if (limits->type == LIMITS_FLOAT)
{
min = limits->v.floating.min;
max = limits->v.floating.max;
}
else
{
strcpy(error_string, _("Only integers and floats can be limits for a float argument"));
error_region = limits->region;
JUMP(1);
}
arg_decl->v.floating.have_limits = 1;
arg_decl->v.floating.min = min;
arg_decl->v.floating.max = max;
arg_decl->v.floating.default_value = min;
}
else
{
strcpy(error_string, _("Limits applied to wrongly typed argument"));
error_region = limits->region;
JUMP(1);
}
}
void
apply_default_to_arg_decl (arg_decl_t *arg_decl, exprtree *exprtree)
{
switch (arg_decl->type)
{
case ARG_TYPE_INT :
if (exprtree->type != EXPR_INT_CONST)
{
strcpy(error_string, _("Only integers can be defaults for an int argument"));
error_region = exprtree->region;
JUMP(1);
}
if (exprtree->val.int_const < arg_decl->v.integer.min
|| exprtree->val.int_const > arg_decl->v.integer.max)
{
strcpy(error_string, _("Default value outside of bounds"));
error_region = exprtree->region;
JUMP(1);
}
arg_decl->v.integer.default_value = exprtree->val.int_const;
break;
case ARG_TYPE_FLOAT :
{
float default_value = 0.0;
if (exprtree->type == EXPR_INT_CONST)
default_value = (float)exprtree->val.int_const;
else if (exprtree->type == EXPR_FLOAT_CONST)
default_value = exprtree->val.float_const;
else
{
strcpy(error_string, _("Only floats can be defaults for a float argument"));
error_region = exprtree->region;
JUMP(1);
}
if (default_value < arg_decl->v.floating.min
|| default_value > arg_decl->v.floating.max)
{
strcpy(error_string, _("Default value outside of bounds"));
error_region = exprtree->region;
JUMP(1);
}
arg_decl->v.floating.default_value = default_value;
}
break;
case ARG_TYPE_BOOL :
if (exprtree->type != EXPR_INT_CONST)
{
strcpy(error_string, _("Only integers can be defaults for a bool argument"));
error_region = exprtree->region;
JUMP(1);
}
arg_decl->v.boolean.default_value = exprtree->val.int_const ? 1 : 0;
break;
default :
strcpy(error_string, _("Default applied to wrongly typed argument"));
error_region = exprtree->region;
JUMP(1);
}
}
static exprtree*
alloc_exprtree (void)
{
exprtree *tree = (exprtree*)malloc(sizeof(exprtree));
assert(tree != 0);
tree->region = scanner_null_region;
tree->next = 0;
return tree;
}
exprtree*
make_int_number (int num, scanner_region_t region)
{
exprtree *tree = alloc_exprtree();
tree->type = EXPR_INT_CONST;
tree->val.int_const = num;
tree->result = make_tuple_info(nil_tag_number, 1);
tree->region = region;
return tree;
}
exprtree*
make_float_number (float num, scanner_region_t region)
{
exprtree *tree = alloc_exprtree();
tree->type = EXPR_FLOAT_CONST;
tree->val.float_const = num;
tree->result = make_tuple_info(nil_tag_number, 1);
tree->region = region;
return tree;
}
static exprtree*
make_range_list (int first, int last, scanner_region_t region)
{
exprtree *tree;
if (first > last)
return NULL;
tree = make_int_number(first, region);
tree->next = make_range_list(first + 1, last, region);
return tree;
}
exprtree*
make_range (exprtree *first_expr, exprtree *last_expr)
{
scanner_region_t region = scanner_region_merge (first_expr->region, last_expr->region);
int first, last;
g_assert(first_expr->type == EXPR_INT_CONST && last_expr->type == EXPR_INT_CONST);
first = first_expr->val.int_const;
last = last_expr->val.int_const;
if (first > last)
{
sprintf(error_string, _("Invalid range %d..%d."), first, last);
error_region = region;
JUMP(1);
}
return make_range_list(first, last, region);
}
static scanner_region_t
exprlist_region (exprtree *list)
{
if (list == NULL)
return scanner_null_region;
return scanner_region_merge(list->region, exprlist_region(list->next));
}
exprtree*
make_function_from_string (const char *name, exprtree *args, scanner_region_t name_region)
{
scanner_ident_t *ident = scanner_make_ident(name_region, name);
exprtree *tree = make_function(ident, args);
free(ident);
return tree;
}
exprtree*
make_var_from_string (const char *name)
{
scanner_ident_t *ident = scanner_make_ident(scanner_null_region, name);
exprtree *tree = make_var(ident);
free(ident);
return tree;
}
static exprtree*
make_userval (userval_info_t *info, exprtree *args, scanner_region_t region)
{
exprtree *tree = alloc_exprtree();
switch (info->type)
{
case USERVAL_INT_CONST :
case USERVAL_FLOAT_CONST :
case USERVAL_BOOL_CONST :
case USERVAL_COLOR :
if (exprlist_length(args) != 0)
{
sprintf(error_string, _("Number, bool and color inputs take no arguments."));
error_region = region;
JUMP(1);
}
if (info->type == USERVAL_COLOR)
{
tree->result.number = rgba_tag_number;
tree->result.length = 4;
}
else
{
tree->result.number = nil_tag_number;
tree->result.length = 1;
}
break;
case USERVAL_CURVE :
tree->result.number = curve_tag_number;
tree->result.length = 1;
break;
case USERVAL_GRADIENT :
tree->result.number = gradient_tag_number;
tree->result.length = 1;
break;
case USERVAL_IMAGE :
tree->result.number = image_tag_number;
tree->result.length = 1;
break;
default :
g_assert_not_reached();
}
tree->type = EXPR_USERVAL;
tree->val.userval.info = info;
tree->region = scanner_region_merge(region, exprlist_region(args));
switch (info->type)
{
case USERVAL_CURVE :
if (exprlist_length(args) == 1)
return make_function_from_string("__applyCurve", exprlist_append(tree, args), region);
if (exprlist_length(args) != 0)
{
sprintf(error_string, _("A curve takes one argument."));
error_region = region;
JUMP(1);
}
break;
case USERVAL_GRADIENT :
if (exprlist_length(args) == 1)
return make_function_from_string("__applyGradient", exprlist_append(tree, args), region);
if (exprlist_length(args) != 0)
{
sprintf(error_string, _("A gradient takes one argument."));
error_region = region;
JUMP(1);
}
break;
case USERVAL_IMAGE :
if (exprlist_length(args) == 1 || exprlist_length(args) == 2)
return make_function_from_string("__origVal", exprlist_append(args, tree), region);
if (exprlist_length(args) != 0)
{
sprintf(error_string, _("An image takes one or two arguments."));
error_region = region;
JUMP(1);
}
break;
default :
g_assert(args == NULL);
break;
}
return tree;
}
static exprtree*
make_var_exprtree (variable_t *var, tuple_info_t info, scanner_region_t region)
{
exprtree *tree = alloc_exprtree();
tree->type = EXPR_VARIABLE;
tree->val.var = var;
tree->result = info;
tree->region = region;
return tree;
}
exprtree*
make_var (scanner_ident_t *name_ident)
{
char *name = name_ident->str;
scanner_region_t region = name_ident->region;
tuple_info_t info;
exprtree *tree = 0;
if (lookup_internal(the_mathmap->current_filter->v.mathmap.internals, name, 0) != 0)
{
tree = alloc_exprtree();
tree->type = EXPR_INTERNAL;
tree->val.internal = lookup_internal(the_mathmap->current_filter->v.mathmap.internals, name, 0);
tree->result = make_tuple_info(nil_tag_number, 1);
tree->region = region;
}
else if (lookup_variable_macro(name, &info) != 0)
{
macro_function_t function = lookup_variable_macro(name, &info);
tree = function(0);
tree->region = name_ident->region;
}
else if (lookup_userval(the_mathmap->current_filter->userval_infos, name) != 0)
{
userval_info_t *info = lookup_userval(the_mathmap->current_filter->userval_infos, name);
tree = make_userval(info, 0, region);
}
else if (lookup_variable(the_mathmap->current_filter->v.mathmap.variables, name, &info) != 0)
{
variable_t *var = lookup_variable(the_mathmap->current_filter->v.mathmap.variables, name, &info);
return make_var_exprtree(var, info, region);
}
else
{
sprintf(error_string, _("Undefined variable %s."), name);
error_region = region;
JUMP(1);
}
return tree;
}
exprtree*
make_tuple_exprtree (exprtree *elems)
{
exprtree *tree, *elem;
int length;
length = 0;
for (elem = elems; elem != 0; elem = elem->next)
{
++length;
if (elem->result.length != 1)
{
sprintf(error_string, _("Tuples cannot contain tuples of length other than 1."));
error_region = elem->region;
JUMP(1);
}
}
tree = alloc_exprtree();
tree->type = EXPR_TUPLE;
tree->val.tuple.length = length;
tree->val.tuple.elems = elems;
tree->region = exprlist_region(elems);
tree->result = make_tuple_info(nil_tag_number, length);
return tree;
}
exprtree*
make_select (exprtree *tuple, exprtree *subscripts)
{
exprtree *tree = alloc_exprtree();
tree->type = EXPR_SELECT;
tree->val.select.tuple = tuple;
tree->val.select.subscripts = subscripts;
tree->region = scanner_region_merge(tuple->region, exprlist_region(subscripts));
if (subscripts->result.length == 1)
tree->result = make_tuple_info(nil_tag_number, 1);
else
tree->result = make_tuple_info(tuple->result.number, subscripts->result.length);
return tree;
}
exprtree*
make_cast (scanner_ident_t *tagname, exprtree *tuple)
{
exprtree *tree = alloc_exprtree();
int tagnum = tag_number_for_name(tagname->str);
if (tuple->type == EXPR_TUPLE_CONST)
{
tree->type = EXPR_TUPLE_CONST;
tree->val.tuple_const = copy_tuple(tuple->val.tuple_const);
tree->val.tuple_const->number = tagnum;
}
else
{
tree->type = EXPR_CAST;
tree->val.cast.tagnum = tagnum;
tree->val.cast.tuple = tuple;
}
tree->region = scanner_region_merge(tagname->region, tuple->region);
tree->result = make_tuple_info(tagnum, tuple->result.length);
return tree;
}
exprtree*
make_convert (scanner_ident_t *tagname_ident, exprtree *tuple)
{
exprtree *tree = alloc_exprtree();
tree->type = EXPR_CONVERT;
tree->val.convert.tagnum = tag_number_for_name(tagname_ident->str);
tree->val.convert.tuple = tuple;
tree->result = make_tuple_info(tree->val.convert.tagnum, tuple->result.length);
tree->region = scanner_region_merge(tagname_ident->region, tuple->region);
return tree;
}
filter_t*
lookup_filter (filter_t *filters, const char *name)
{
filter_t *filter;
for (filter = filters; filter != 0; filter = filter->next)
if (strcmp(filter->name, name) == 0)
return filter;
return 0;
}
static exprtree*
make_filter_call (filter_t *filter, exprtree *args, scanner_region_t filter_region)
{
scanner_region_t region = scanner_region_merge(filter_region, exprlist_region(args));
userval_info_t *info;
exprtree **argp;
exprtree *closure;
int num_args = exprlist_length(args);
gboolean is_closure;
exprtree *closure_args, *call_args;
if (num_args < filter->num_uservals
|| num_args >= filter->num_uservals + 3)
{
sprintf(error_string, _("Filter %s takes %d to %d arguments but is called with %d."),
filter->name, filter->num_uservals, filter->num_uservals + 2, exprlist_length(args));
error_region = region;
JUMP(1);
}
is_closure = (num_args == filter->num_uservals);
for (info = filter->userval_infos, argp = &args;
info != 0;
info = info->next, argp = &(*argp)->next)
{
switch (info->type)
{
case USERVAL_INT_CONST :
case USERVAL_FLOAT_CONST :
case USERVAL_BOOL_CONST :
case USERVAL_CURVE :
case USERVAL_GRADIENT :
case USERVAL_IMAGE :
if ((*argp)->result.length != 1)
{
sprintf(error_string, _("Can only pass tuples of length 1 as numbers, booleans, curves, gradients, or images."));
error_region = (*argp)->region;
JUMP(1);
}
break;
case USERVAL_COLOR :
if ((*argp)->result.number != rgba_tag_number || (*argp)->result.length != 4)
{
sprintf(error_string, _("Can only pass tuples of type rgba:4 as colors."));
error_region = (*argp)->region;
JUMP(1);
}
break;
default :
g_assert_not_reached();
}
}
if (filter->num_uservals == 0)
closure_args = NULL;
else
closure_args = args;
call_args = *argp;
*argp = NULL;
if (is_closure)
g_assert(call_args == 0);
closure = alloc_exprtree();
closure->type = EXPR_FILTER_CLOSURE;
closure->val.filter_closure.filter = filter;
closure->val.filter_closure.args = closure_args;
closure->result.number = image_tag_number;
closure->result.length = 1;
closure->region = region;
if (is_closure)
return closure;
g_assert(call_args != NULL);
if (call_args->result.length != 2
|| (call_args->result.number != xy_tag_number
&& call_args->result.number != ra_tag_number))
{
sprintf(error_string, _("The coordinate argument to a filter must be a tuple of type xy:2 or ra:2."));
error_region = call_args->region;
JUMP(1);
}
if (call_args->result.number == ra_tag_number)
{
exprtree *next = call_args->next;
call_args->next = NULL;
call_args = make_function_from_string("toXY", call_args, call_args->region);
call_args->next = next;
}
g_assert(call_args->result.length == 2 && call_args->result.number == xy_tag_number);
argp = &call_args->next;
if (*argp == NULL)
*argp = make_var_from_string("t");
else if ((*argp)->result.length != 1)
{
sprintf(error_string, _("The time argument to a filter must be a tuple of length 1."));
error_region = (*argp)->region;
JUMP(1);
}
g_assert(exprlist_length(call_args) == 2);
return make_function_from_string("__origVal", exprlist_append(call_args, closure), filter_region);
}
static exprtree*
make_image_call (exprtree *image, exprtree *args, scanner_region_t region)
{
exprtree *tree;
scanner_ident_t *ident;
if (exprlist_length(args) != 1 && exprlist_length(args) != 2)
{
sprintf(error_string, _("An image must be invoked with one or two arguments."));
error_region = region;
JUMP(1);
}
if (args->result.length != 2
|| (args->result.number != xy_tag_number
&& args->result.number != ra_tag_number))
{
sprintf(error_string, _("The coordinate argument to an image must be of type xy:2 or ra:2."));
error_region = region;
JUMP(1);
}
if (args->result.number == ra_tag_number)
args = make_function_from_string("toXY", args, args->region);
if (args->next != NULL)
{
if (args->next->result.length != 1)
{
sprintf(error_string, _("The time argument to an image have length 1."));
error_region = region;
JUMP(1);
}
}
ident = scanner_make_ident(scanner_null_region, "__origVal");
tree = make_function(ident, exprlist_append(args, image));
free(ident);
return tree;
}
static struct { const char *op, *func; } binop_table[] = {
{ "+", "__add" },
{ "-", "__sub" },
{ "*", "__mul" },
{ "/", "__div" },
{ "%", "__mod" },
{ "^", "__pow" },
{ "==", "__equal" },
{ "<", "__less" },
{ ">", "__greater" },
{ "<=", "__lessequal" },
{ ">=", "__greaterequal" },
{ "!=", "__notequal" },
{ "||", "__or" },
{ "&&", "__and" },
{ "xor", "__xor" },
{ NULL, NULL }
};
static struct { const char *op, *func; } unop_table[] = {
{ "-", "__neg" },
{ "!", "__not" },
{ NULL, NULL }