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linux/scripts/kconfig/expr.c
Vadim Bendebury (вб) da60fbbcb6 menuconfig: wrap long help lines 
Help text for certain config options is very extensive (the text
includes the names of all  other options the option in question depends
on). Long lines are not wrapped, making it impossible to see the list
without scrolling horizontally.

This patch adds some logic which wraps help screen lines at word
boundaries to prevent truncating.

Tested by running

  ARCH=powerpc make menuconfig O=/tmp/build

which shows that the long lines are now wrapped, and

 ARCH=powerpc make xconfig O=/tmp/build

to demonstrate that it still compiles and operates as expected.

Signed-off-by: Vadim Bendebury <vbendeb@google.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-02-02 14:33:55 +01:00

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/*
* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
* Released under the terms of the GNU GPL v2.0.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LKC_DIRECT_LINK
#include "lkc.h"
#define DEBUG_EXPR 0
struct expr *expr_alloc_symbol(struct symbol *sym)
{
struct expr *e = malloc(sizeof(*e));
memset(e, 0, sizeof(*e));
e->type = E_SYMBOL;
e->left.sym = sym;
return e;
}
struct expr *expr_alloc_one(enum expr_type type, struct expr *ce)
{
struct expr *e = malloc(sizeof(*e));
memset(e, 0, sizeof(*e));
e->type = type;
e->left.expr = ce;
return e;
}
struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2)
{
struct expr *e = malloc(sizeof(*e));
memset(e, 0, sizeof(*e));
e->type = type;
e->left.expr = e1;
e->right.expr = e2;
return e;
}
struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2)
{
struct expr *e = malloc(sizeof(*e));
memset(e, 0, sizeof(*e));
e->type = type;
e->left.sym = s1;
e->right.sym = s2;
return e;
}
struct expr *expr_alloc_and(struct expr *e1, struct expr *e2)
{
if (!e1)
return e2;
return e2 ? expr_alloc_two(E_AND, e1, e2) : e1;
}
struct expr *expr_alloc_or(struct expr *e1, struct expr *e2)
{
if (!e1)
return e2;
return e2 ? expr_alloc_two(E_OR, e1, e2) : e1;
}
struct expr *expr_copy(struct expr *org)
{
struct expr *e;
if (!org)
return NULL;
e = malloc(sizeof(*org));
memcpy(e, org, sizeof(*org));
switch (org->type) {
case E_SYMBOL:
e->left = org->left;
break;
case E_NOT:
e->left.expr = expr_copy(org->left.expr);
break;
case E_EQUAL:
case E_UNEQUAL:
e->left.sym = org->left.sym;
e->right.sym = org->right.sym;
break;
case E_AND:
case E_OR:
case E_LIST:
e->left.expr = expr_copy(org->left.expr);
e->right.expr = expr_copy(org->right.expr);
break;
default:
printf("can't copy type %d\n", e->type);
free(e);
e = NULL;
break;
}
return e;
}
void expr_free(struct expr *e)
{
if (!e)
return;
switch (e->type) {
case E_SYMBOL:
break;
case E_NOT:
expr_free(e->left.expr);
return;
case E_EQUAL:
case E_UNEQUAL:
break;
case E_OR:
case E_AND:
expr_free(e->left.expr);
expr_free(e->right.expr);
break;
default:
printf("how to free type %d?\n", e->type);
break;
}
free(e);
}
static int trans_count;
#define e1 (*ep1)
#define e2 (*ep2)
static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
if (e1->type == type) {
__expr_eliminate_eq(type, &e1->left.expr, &e2);
__expr_eliminate_eq(type, &e1->right.expr, &e2);
return;
}
if (e2->type == type) {
__expr_eliminate_eq(type, &e1, &e2->left.expr);
__expr_eliminate_eq(type, &e1, &e2->right.expr);
return;
}
if (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
e1->left.sym == e2->left.sym &&
(e1->left.sym == &symbol_yes || e1->left.sym == &symbol_no))
return;
if (!expr_eq(e1, e2))
return;
trans_count++;
expr_free(e1); expr_free(e2);
switch (type) {
case E_OR:
e1 = expr_alloc_symbol(&symbol_no);
e2 = expr_alloc_symbol(&symbol_no);
break;
case E_AND:
e1 = expr_alloc_symbol(&symbol_yes);
e2 = expr_alloc_symbol(&symbol_yes);
break;
default:
;
}
}
void expr_eliminate_eq(struct expr **ep1, struct expr **ep2)
{
if (!e1 || !e2)
return;
switch (e1->type) {
case E_OR:
case E_AND:
__expr_eliminate_eq(e1->type, ep1, ep2);
default:
;
}
if (e1->type != e2->type) switch (e2->type) {
case E_OR:
case E_AND:
__expr_eliminate_eq(e2->type, ep1, ep2);
default:
;
}
e1 = expr_eliminate_yn(e1);
e2 = expr_eliminate_yn(e2);
}
#undef e1
#undef e2
int expr_eq(struct expr *e1, struct expr *e2)
{
int res, old_count;
if (e1->type != e2->type)
return 0;
switch (e1->type) {
case E_EQUAL:
case E_UNEQUAL:
return e1->left.sym == e2->left.sym && e1->right.sym == e2->right.sym;
case E_SYMBOL:
return e1->left.sym == e2->left.sym;
case E_NOT:
return expr_eq(e1->left.expr, e2->left.expr);
case E_AND:
case E_OR:
e1 = expr_copy(e1);
e2 = expr_copy(e2);
old_count = trans_count;
expr_eliminate_eq(&e1, &e2);
res = (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
e1->left.sym == e2->left.sym);
expr_free(e1);
expr_free(e2);
trans_count = old_count;
return res;
case E_LIST:
case E_RANGE:
case E_NONE:
/* panic */;
}
if (DEBUG_EXPR) {
expr_fprint(e1, stdout);
printf(" = ");
expr_fprint(e2, stdout);
printf(" ?\n");
}
return 0;
}
struct expr *expr_eliminate_yn(struct expr *e)
{
struct expr *tmp;
if (e) switch (e->type) {
case E_AND:
e->left.expr = expr_eliminate_yn(e->left.expr);
e->right.expr = expr_eliminate_yn(e->right.expr);
if (e->left.expr->type == E_SYMBOL) {
if (e->left.expr->left.sym == &symbol_no) {
expr_free(e->left.expr);
expr_free(e->right.expr);
e->type = E_SYMBOL;
e->left.sym = &symbol_no;
e->right.expr = NULL;
return e;
} else if (e->left.expr->left.sym == &symbol_yes) {
free(e->left.expr);
tmp = e->right.expr;
*e = *(e->right.expr);
free(tmp);
return e;
}
}
if (e->right.expr->type == E_SYMBOL) {
if (e->right.expr->left.sym == &symbol_no) {
expr_free(e->left.expr);
expr_free(e->right.expr);
e->type = E_SYMBOL;
e->left.sym = &symbol_no;
e->right.expr = NULL;
return e;
} else if (e->right.expr->left.sym == &symbol_yes) {
free(e->right.expr);
tmp = e->left.expr;
*e = *(e->left.expr);
free(tmp);
return e;
}
}
break;
case E_OR:
e->left.expr = expr_eliminate_yn(e->left.expr);
e->right.expr = expr_eliminate_yn(e->right.expr);
if (e->left.expr->type == E_SYMBOL) {
if (e->left.expr->left.sym == &symbol_no) {
free(e->left.expr);
tmp = e->right.expr;
*e = *(e->right.expr);
free(tmp);
return e;
} else if (e->left.expr->left.sym == &symbol_yes) {
expr_free(e->left.expr);
expr_free(e->right.expr);
e->type = E_SYMBOL;
e->left.sym = &symbol_yes;
e->right.expr = NULL;
return e;
}
}
if (e->right.expr->type == E_SYMBOL) {
if (e->right.expr->left.sym == &symbol_no) {
free(e->right.expr);
tmp = e->left.expr;
*e = *(e->left.expr);
free(tmp);
return e;
} else if (e->right.expr->left.sym == &symbol_yes) {
expr_free(e->left.expr);
expr_free(e->right.expr);
e->type = E_SYMBOL;
e->left.sym = &symbol_yes;
e->right.expr = NULL;
return e;
}
}
break;
default:
;
}
return e;
}
/*
* bool FOO!=n => FOO
*/
struct expr *expr_trans_bool(struct expr *e)
{
if (!e)
return NULL;
switch (e->type) {
case E_AND:
case E_OR:
case E_NOT:
e->left.expr = expr_trans_bool(e->left.expr);
e->right.expr = expr_trans_bool(e->right.expr);
break;
case E_UNEQUAL:
// FOO!=n -> FOO
if (e->left.sym->type == S_TRISTATE) {
if (e->right.sym == &symbol_no) {
e->type = E_SYMBOL;
e->right.sym = NULL;
}
}
break;
default:
;
}
return e;
}
/*
* e1 || e2 -> ?
*/
static struct expr *expr_join_or(struct expr *e1, struct expr *e2)
{
struct expr *tmp;
struct symbol *sym1, *sym2;
if (expr_eq(e1, e2))
return expr_copy(e1);
if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
return NULL;
if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
return NULL;
if (e1->type == E_NOT) {
tmp = e1->left.expr;
if (tmp->type != E_EQUAL && tmp->type != E_UNEQUAL && tmp->type != E_SYMBOL)
return NULL;
sym1 = tmp->left.sym;
} else
sym1 = e1->left.sym;
if (e2->type == E_NOT) {
if (e2->left.expr->type != E_SYMBOL)
return NULL;
sym2 = e2->left.expr->left.sym;
} else
sym2 = e2->left.sym;
if (sym1 != sym2)
return NULL;
if (sym1->type != S_BOOLEAN && sym1->type != S_TRISTATE)
return NULL;
if (sym1->type == S_TRISTATE) {
if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_mod) ||
(e1->right.sym == &symbol_mod && e2->right.sym == &symbol_yes))) {
// (a='y') || (a='m') -> (a!='n')
return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_no);
}
if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_no) ||
(e1->right.sym == &symbol_no && e2->right.sym == &symbol_yes))) {
// (a='y') || (a='n') -> (a!='m')
return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_mod);
}
if (e1->type == E_EQUAL && e2->type == E_EQUAL &&
((e1->right.sym == &symbol_mod && e2->right.sym == &symbol_no) ||
(e1->right.sym == &symbol_no && e2->right.sym == &symbol_mod))) {
// (a='m') || (a='n') -> (a!='y')
return expr_alloc_comp(E_UNEQUAL, sym1, &symbol_yes);
}
}
if (sym1->type == S_BOOLEAN && sym1 == sym2) {
if ((e1->type == E_NOT && e1->left.expr->type == E_SYMBOL && e2->type == E_SYMBOL) ||
(e2->type == E_NOT && e2->left.expr->type == E_SYMBOL && e1->type == E_SYMBOL))
return expr_alloc_symbol(&symbol_yes);
}
if (DEBUG_EXPR) {
printf("optimize (");
expr_fprint(e1, stdout);
printf(") || (");
expr_fprint(e2, stdout);
printf(")?\n");
}
return NULL;
}
static struct expr *expr_join_and(struct expr *e1, struct expr *e2)
{
struct expr *tmp;
struct symbol *sym1, *sym2;
if (expr_eq(e1, e2))
return expr_copy(e1);
if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
return NULL;
if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
return NULL;
if (e1->type == E_NOT) {
tmp = e1->left.expr;
if (tmp->type != E_EQUAL && tmp->type != E_UNEQUAL && tmp->type != E_SYMBOL)
return NULL;
sym1 = tmp->left.sym;
} else
sym1 = e1->left.sym;
if (e2->type == E_NOT) {
if (e2->left.expr->type != E_SYMBOL)
return NULL;
sym2 = e2->left.expr->left.sym;
} else
sym2 = e2->left.sym;
if (sym1 != sym2)
return NULL;
if (sym1->type != S_BOOLEAN && sym1->type != S_TRISTATE)
return NULL;
if ((e1->type == E_SYMBOL && e2->type == E_EQUAL && e2->right.sym == &symbol_yes) ||
(e2->type == E_SYMBOL && e1->type == E_EQUAL && e1->right.sym == &symbol_yes))
// (a) && (a='y') -> (a='y')
return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);
if ((e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_no) ||
(e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_no))
// (a) && (a!='n') -> (a)
return expr_alloc_symbol(sym1);
if ((e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_mod) ||
(e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_mod))
// (a) && (a!='m') -> (a='y')
return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);
if (sym1->type == S_TRISTATE) {
if (e1->type == E_EQUAL && e2->type == E_UNEQUAL) {
// (a='b') && (a!='c') -> 'b'='c' ? 'n' : a='b'
sym2 = e1->right.sym;
if ((e2->right.sym->flags & SYMBOL_CONST) && (sym2->flags & SYMBOL_CONST))
return sym2 != e2->right.sym ? expr_alloc_comp(E_EQUAL, sym1, sym2)
: expr_alloc_symbol(&symbol_no);
}
if (e1->type == E_UNEQUAL && e2->type == E_EQUAL) {
// (a='b') && (a!='c') -> 'b'='c' ? 'n' : a='b'
sym2 = e2->right.sym;
if ((e1->right.sym->flags & SYMBOL_CONST) && (sym2->flags & SYMBOL_CONST))
return sym2 != e1->right.sym ? expr_alloc_comp(E_EQUAL, sym1, sym2)
: expr_alloc_symbol(&symbol_no);
}
if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_no) ||
(e1->right.sym == &symbol_no && e2->right.sym == &symbol_yes)))
// (a!='y') && (a!='n') -> (a='m')
return expr_alloc_comp(E_EQUAL, sym1, &symbol_mod);
if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
((e1->right.sym == &symbol_yes && e2->right.sym == &symbol_mod) ||
(e1->right.sym == &symbol_mod && e2->right.sym == &symbol_yes)))
// (a!='y') && (a!='m') -> (a='n')
return expr_alloc_comp(E_EQUAL, sym1, &symbol_no);
if (e1->type == E_UNEQUAL && e2->type == E_UNEQUAL &&
((e1->right.sym == &symbol_mod && e2->right.sym == &symbol_no) ||
(e1->right.sym == &symbol_no && e2->right.sym == &symbol_mod)))
// (a!='m') && (a!='n') -> (a='m')
return expr_alloc_comp(E_EQUAL, sym1, &symbol_yes);
if ((e1->type == E_SYMBOL && e2->type == E_EQUAL && e2->right.sym == &symbol_mod) ||
(e2->type == E_SYMBOL && e1->type == E_EQUAL && e1->right.sym == &symbol_mod) ||
(e1->type == E_SYMBOL && e2->type == E_UNEQUAL && e2->right.sym == &symbol_yes) ||
(e2->type == E_SYMBOL && e1->type == E_UNEQUAL && e1->right.sym == &symbol_yes))
return NULL;
}
if (DEBUG_EXPR) {
printf("optimize (");
expr_fprint(e1, stdout);
printf(") && (");
expr_fprint(e2, stdout);
printf(")?\n");
}
return NULL;
}
static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
struct expr *tmp;
if (e1->type == type) {
expr_eliminate_dups1(type, &e1->left.expr, &e2);
expr_eliminate_dups1(type, &e1->right.expr, &e2);
return;
}
if (e2->type == type) {
expr_eliminate_dups1(type, &e1, &e2->left.expr);
expr_eliminate_dups1(type, &e1, &e2->right.expr);
return;
}
if (e1 == e2)
return;
switch (e1->type) {
case E_OR: case E_AND:
expr_eliminate_dups1(e1->type, &e1, &e1);
default:
;
}
switch (type) {
case E_OR:
tmp = expr_join_or(e1, e2);
if (tmp) {
expr_free(e1); expr_free(e2);
e1 = expr_alloc_symbol(&symbol_no);
e2 = tmp;
trans_count++;
}
break;
case E_AND:
tmp = expr_join_and(e1, e2);
if (tmp) {
expr_free(e1); expr_free(e2);
e1 = expr_alloc_symbol(&symbol_yes);
e2 = tmp;
trans_count++;
}
break;
default:
;
}
#undef e1
#undef e2
}
static void expr_eliminate_dups2(enum expr_type type, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
struct expr *tmp, *tmp1, *tmp2;
if (e1->type == type) {
expr_eliminate_dups2(type, &e1->left.expr, &e2);
expr_eliminate_dups2(type, &e1->right.expr, &e2);
return;
}
if (e2->type == type) {
expr_eliminate_dups2(type, &e1, &e2->left.expr);
expr_eliminate_dups2(type, &e1, &e2->right.expr);
}
if (e1 == e2)
return;
switch (e1->type) {
case E_OR:
expr_eliminate_dups2(e1->type, &e1, &e1);
// (FOO || BAR) && (!FOO && !BAR) -> n
tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
tmp2 = expr_copy(e2);
tmp = expr_extract_eq_and(&tmp1, &tmp2);
if (expr_is_yes(tmp1)) {
expr_free(e1);
e1 = expr_alloc_symbol(&symbol_no);
trans_count++;
}
expr_free(tmp2);
expr_free(tmp1);
expr_free(tmp);
break;
case E_AND:
expr_eliminate_dups2(e1->type, &e1, &e1);
// (FOO && BAR) || (!FOO || !BAR) -> y
tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
tmp2 = expr_copy(e2);
tmp = expr_extract_eq_or(&tmp1, &tmp2);
if (expr_is_no(tmp1)) {
expr_free(e1);
e1 = expr_alloc_symbol(&symbol_yes);
trans_count++;
}
expr_free(tmp2);
expr_free(tmp1);
expr_free(tmp);
break;
default:
;
}
#undef e1
#undef e2
}
struct expr *expr_eliminate_dups(struct expr *e)
{
int oldcount;
if (!e)
return e;
oldcount = trans_count;
while (1) {
trans_count = 0;
switch (e->type) {
case E_OR: case E_AND:
expr_eliminate_dups1(e->type, &e, &e);
expr_eliminate_dups2(e->type, &e, &e);
default:
;
}
if (!trans_count)
break;
e = expr_eliminate_yn(e);
}
trans_count = oldcount;
return e;
}
struct expr *expr_transform(struct expr *e)
{
struct expr *tmp;
if (!e)
return NULL;
switch (e->type) {
case E_EQUAL:
case E_UNEQUAL:
case E_SYMBOL:
case E_LIST:
break;
default:
e->left.expr = expr_transform(e->left.expr);
e->right.expr = expr_transform(e->right.expr);
}
switch (e->type) {
case E_EQUAL:
if (e->left.sym->type != S_BOOLEAN)
break;
if (e->right.sym == &symbol_no) {
e->type = E_NOT;
e->left.expr = expr_alloc_symbol(e->left.sym);
e->right.sym = NULL;
break;
}
if (e->right.sym == &symbol_mod) {
printf("boolean symbol %s tested for 'm'? test forced to 'n'\n", e->left.sym->name);
e->type = E_SYMBOL;
e->left.sym = &symbol_no;
e->right.sym = NULL;
break;
}
if (e->right.sym == &symbol_yes) {
e->type = E_SYMBOL;
e->right.sym = NULL;
break;
}
break;
case E_UNEQUAL:
if (e->left.sym->type != S_BOOLEAN)
break;
if (e->right.sym == &symbol_no) {
e->type = E_SYMBOL;
e->right.sym = NULL;
break;
}
if (e->right.sym == &symbol_mod) {
printf("boolean symbol %s tested for 'm'? test forced to 'y'\n", e->left.sym->name);
e->type = E_SYMBOL;
e->left.sym = &symbol_yes;
e->right.sym = NULL;
break;
}
if (e->right.sym == &symbol_yes) {
e->type = E_NOT;
e->left.expr = expr_alloc_symbol(e->left.sym);
e->right.sym = NULL;
break;
}
break;
case E_NOT:
switch (e->left.expr->type) {
case E_NOT:
// !!a -> a
tmp = e->left.expr->left.expr;
free(e->left.expr);
free(e);
e = tmp;
e = expr_transform(e);
break;
case E_EQUAL:
case E_UNEQUAL:
// !a='x' -> a!='x'
tmp = e->left.expr;
free(e);
e = tmp;
e->type = e->type == E_EQUAL ? E_UNEQUAL : E_EQUAL;
break;
case E_OR:
// !(a || b) -> !a && !b
tmp = e->left.expr;
e->type = E_AND;
e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
tmp->type = E_NOT;
tmp->right.expr = NULL;
e = expr_transform(e);
break;
case E_AND:
// !(a && b) -> !a || !b
tmp = e->left.expr;
e->type = E_OR;
e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
tmp->type = E_NOT;
tmp->right.expr = NULL;
e = expr_transform(e);
break;
case E_SYMBOL:
if (e->left.expr->left.sym == &symbol_yes) {
// !'y' -> 'n'
tmp = e->left.expr;
free(e);
e = tmp;
e->type = E_SYMBOL;
e->left.sym = &symbol_no;
break;
}
if (e->left.expr->left.sym == &symbol_mod) {
// !'m' -> 'm'
tmp = e->left.expr;
free(e);
e = tmp;
e->type = E_SYMBOL;
e->left.sym = &symbol_mod;
break;
}
if (e->left.expr->left.sym == &symbol_no) {
// !'n' -> 'y'
tmp = e->left.expr;
free(e);
e = tmp;
e->type = E_SYMBOL;
e->left.sym = &symbol_yes;
break;
}
break;
default:
;
}
break;
default:
;
}
return e;
}
int expr_contains_symbol(struct expr *dep, struct symbol *sym)
{
if (!dep)
return 0;
switch (dep->type) {
case E_AND:
case E_OR:
return expr_contains_symbol(dep->left.expr, sym) ||
expr_contains_symbol(dep->right.expr, sym);
case E_SYMBOL:
return dep->left.sym == sym;
case E_EQUAL:
case E_UNEQUAL:
return dep->left.sym == sym ||
dep->right.sym == sym;
case E_NOT:
return expr_contains_symbol(dep->left.expr, sym);
default:
;
}
return 0;
}
bool expr_depends_symbol(struct expr *dep, struct symbol *sym)
{
if (!dep)
return false;
switch (dep->type) {
case E_AND:
return expr_depends_symbol(dep->left.expr, sym) ||
expr_depends_symbol(dep->right.expr, sym);
case E_SYMBOL:
return dep->left.sym == sym;
case E_EQUAL:
if (dep->left.sym == sym) {
if (dep->right.sym == &symbol_yes || dep->right.sym == &symbol_mod)
return true;
}
break;
case E_UNEQUAL:
if (dep->left.sym == sym) {
if (dep->right.sym == &symbol_no)
return true;
}
break;
default:
;
}
return false;
}
struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2)
{
struct expr *tmp = NULL;
expr_extract_eq(E_AND, &tmp, ep1, ep2);
if (tmp) {
*ep1 = expr_eliminate_yn(*ep1);
*ep2 = expr_eliminate_yn(*ep2);
}
return tmp;
}
struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2)
{
struct expr *tmp = NULL;
expr_extract_eq(E_OR, &tmp, ep1, ep2);
if (tmp) {
*ep1 = expr_eliminate_yn(*ep1);
*ep2 = expr_eliminate_yn(*ep2);
}
return tmp;
}
void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2)
{
#define e1 (*ep1)
#define e2 (*ep2)
if (e1->type == type) {
expr_extract_eq(type, ep, &e1->left.expr, &e2);
expr_extract_eq(type, ep, &e1->right.expr, &e2);
return;
}
if (e2->type == type) {
expr_extract_eq(type, ep, ep1, &e2->left.expr);
expr_extract_eq(type, ep, ep1, &e2->right.expr);
return;
}
if (expr_eq(e1, e2)) {
*ep = *ep ? expr_alloc_two(type, *ep, e1) : e1;
expr_free(e2);
if (type == E_AND) {
e1 = expr_alloc_symbol(&symbol_yes);
e2 = expr_alloc_symbol(&symbol_yes);
} else if (type == E_OR) {
e1 = expr_alloc_symbol(&symbol_no);
e2 = expr_alloc_symbol(&symbol_no);
}
}
#undef e1
#undef e2
}
struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym)
{
struct expr *e1, *e2;
if (!e) {
e = expr_alloc_symbol(sym);
if (type == E_UNEQUAL)
e = expr_alloc_one(E_NOT, e);
return e;
}
switch (e->type) {
case E_AND:
e1 = expr_trans_compare(e->left.expr, E_EQUAL, sym);
e2 = expr_trans_compare(e->right.expr, E_EQUAL, sym);
if (sym == &symbol_yes)
e = expr_alloc_two(E_AND, e1, e2);
if (sym == &symbol_no)
e = expr_alloc_two(E_OR, e1, e2);
if (type == E_UNEQUAL)
e = expr_alloc_one(E_NOT, e);
return e;
case E_OR:
e1 = expr_trans_compare(e->left.expr, E_EQUAL, sym);
e2 = expr_trans_compare(e->right.expr, E_EQUAL, sym);
if (sym == &symbol_yes)
e = expr_alloc_two(E_OR, e1, e2);
if (sym == &symbol_no)
e = expr_alloc_two(E_AND, e1, e2);
if (type == E_UNEQUAL)
e = expr_alloc_one(E_NOT, e);
return e;
case E_NOT:
return expr_trans_compare(e->left.expr, type == E_EQUAL ? E_UNEQUAL : E_EQUAL, sym);
case E_UNEQUAL:
case E_EQUAL:
if (type == E_EQUAL) {
if (sym == &symbol_yes)
return expr_copy(e);
if (sym == &symbol_mod)
return expr_alloc_symbol(&symbol_no);
if (sym == &symbol_no)
return expr_alloc_one(E_NOT, expr_copy(e));
} else {
if (sym == &symbol_yes)
return expr_alloc_one(E_NOT, expr_copy(e));
if (sym == &symbol_mod)
return expr_alloc_symbol(&symbol_yes);
if (sym == &symbol_no)
return expr_copy(e);
}
break;
case E_SYMBOL:
return expr_alloc_comp(type, e->left.sym, sym);
case E_LIST:
case E_RANGE:
case E_NONE:
/* panic */;
}
return NULL;
}
tristate expr_calc_value(struct expr *e)
{
tristate val1, val2;
const char *str1, *str2;
if (!e)
return yes;
switch (e->type) {
case E_SYMBOL:
sym_calc_value(e->left.sym);
return e->left.sym->curr.tri;
case E_AND:
val1 = expr_calc_value(e->left.expr);
val2 = expr_calc_value(e->right.expr);
return EXPR_AND(val1, val2);
case E_OR:
val1 = expr_calc_value(e->left.expr);
val2 = expr_calc_value(e->right.expr);
return EXPR_OR(val1, val2);
case E_NOT:
val1 = expr_calc_value(e->left.expr);
return EXPR_NOT(val1);
case E_EQUAL:
sym_calc_value(e->left.sym);
sym_calc_value(e->right.sym);
str1 = sym_get_string_value(e->left.sym);
str2 = sym_get_string_value(e->right.sym);
return !strcmp(str1, str2) ? yes : no;
case E_UNEQUAL:
sym_calc_value(e->left.sym);
sym_calc_value(e->right.sym);
str1 = sym_get_string_value(e->left.sym);
str2 = sym_get_string_value(e->right.sym);
return !strcmp(str1, str2) ? no : yes;
default:
printf("expr_calc_value: %d?\n", e->type);
return no;
}
}
int expr_compare_type(enum expr_type t1, enum expr_type t2)
{
#if 0
return 1;
#else
if (t1 == t2)
return 0;
switch (t1) {
case E_EQUAL:
case E_UNEQUAL:
if (t2 == E_NOT)
return 1;
case E_NOT:
if (t2 == E_AND)
return 1;
case E_AND:
if (t2 == E_OR)
return 1;
case E_OR:
if (t2 == E_LIST)
return 1;
case E_LIST:
if (t2 == 0)
return 1;
default:
return -1;
}
printf("[%dgt%d?]", t1, t2);
return 0;
#endif
}
void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
{
if (!e) {
fn(data, NULL, "y");
return;
}
if (expr_compare_type(prevtoken, e->type) > 0)
fn(data, NULL, "(");
switch (e->type) {
case E_SYMBOL:
if (e->left.sym->name)
fn(data, e->left.sym, e->left.sym->name);
else
fn(data, NULL, "<choice>");
break;
case E_NOT:
fn(data, NULL, "!");
expr_print(e->left.expr, fn, data, E_NOT);
break;
case E_EQUAL:
if (e->left.sym->name)
fn(data, e->left.sym, e->left.sym->name);
else
fn(data, NULL, "<choice>");
fn(data, NULL, "=");
fn(data, e->right.sym, e->right.sym->name);
break;
case E_UNEQUAL:
if (e->left.sym->name)
fn(data, e->left.sym, e->left.sym->name);
else
fn(data, NULL, "<choice>");
fn(data, NULL, "!=");
fn(data, e->right.sym, e->right.sym->name);
break;
case E_OR:
expr_print(e->left.expr, fn, data, E_OR);
fn(data, NULL, " || ");
expr_print(e->right.expr, fn, data, E_OR);
break;
case E_AND:
expr_print(e->left.expr, fn, data, E_AND);
fn(data, NULL, " && ");
expr_print(e->right.expr, fn, data, E_AND);
break;
case E_LIST:
fn(data, e->right.sym, e->right.sym->name);
if (e->left.expr) {
fn(data, NULL, " ^ ");
expr_print(e->left.expr, fn, data, E_LIST);
}
break;
case E_RANGE:
fn(data, NULL, "[");
fn(data, e->left.sym, e->left.sym->name);
fn(data, NULL, " ");
fn(data, e->right.sym, e->right.sym->name);
fn(data, NULL, "]");
break;
default:
{
char buf[32];
sprintf(buf, "<unknown type %d>", e->type);
fn(data, NULL, buf);
break;
}
}
if (expr_compare_type(prevtoken, e->type) > 0)
fn(data, NULL, ")");
}
static void expr_print_file_helper(void *data, struct symbol *sym, const char *str)
{
fwrite(str, strlen(str), 1, data);
}
void expr_fprint(struct expr *e, FILE *out)
{
expr_print(e, expr_print_file_helper, out, E_NONE);
}
static void expr_print_gstr_helper(void *data, struct symbol *sym, const char *str)
{
struct gstr *gs = (struct gstr*)data;
const char *sym_str = NULL;
if (sym)
sym_str = sym_get_string_value(sym);
if (gs->max_width) {
unsigned extra_length = strlen(str);
const char *last_cr = strrchr(gs->s, '\n');
unsigned last_line_length;
if (sym_str)
extra_length += 4 + strlen(sym_str);
if (!last_cr)
last_cr = gs->s;
last_line_length = strlen(gs->s) - (last_cr - gs->s);
if ((last_line_length + extra_length) > gs->max_width)
str_append(gs, "\\\n");
}
str_append(gs, str);
if (sym)
str_printf(gs, " [=%s]", sym_str);
}
void expr_gstr_print(struct expr *e, struct gstr *gs)
{
expr_print(e, expr_print_gstr_helper, gs, E_NONE);
}
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