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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>

#include "lkc.h"

#define DEBUG_EXPR	0

static int expr_eq(struct expr *e1, struct expr *e2);
static struct expr *expr_eliminate_yn(struct expr *e);

struct expr *expr_alloc_symbol(struct symbol *sym)
{
	struct expr *e = xcalloc(1, 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 = xcalloc(1, 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 = xcalloc(1, 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 = xcalloc(1, 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(const struct expr *org)
{
	struct expr *e;

	if (!org)
		return NULL;

	e = xmalloc(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_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	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);
		break;
	case E_EQUAL:
	case E_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	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

static int expr_eq(struct expr *e1, struct expr *e2)
{
	int res, old_count;

	/*
	 * A NULL expr is taken to be yes, but there's also a different way to
	 * represent yes. expr_is_yes() checks for either representation.
	 */
	if (!e1 || !e2)
		return expr_is_yes(e1) && expr_is_yes(e2);

	if (e1->type != e2->type)
		return 0;
	switch (e1->type) {
	case E_EQUAL:
	case E_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	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;
}

static 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
}

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);
		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_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	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_LEQ:
		case E_GEQ:
			// !a<='x' -> a>'x'
			tmp = e->left.expr;
			free(e);
			e = tmp;
			e->type = e->type == E_LEQ ? E_GTH : E_LTH;
			break;
		case E_LTH:
		case E_GTH:
			// !a<'x' -> a>='x'
			tmp = e->left.expr;
			free(e);
			e = tmp;
			e->type = e->type == E_LTH ? E_GEQ : E_LEQ;
			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_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	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_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_LTH:
	case E_LEQ:
	case E_GTH:
	case E_GEQ:
	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;
}

enum string_value_kind {
	k_string,
	k_signed,
	k_unsigned,
	k_invalid
};

union string_value {
	unsigned long long u;
	signed long long s;
};

static enum string_value_kind expr_parse_string(const char *str,
						enum symbol_type type,
						union string_value *val)
{
	char *tail;
	enum string_value_kind kind;

	errno = 0;
	switch (type) {
	case S_BOOLEAN:
	case S_TRISTATE:
		val->s = !strcmp(str, "n") ? 0 :
			 !strcmp(str, "m") ? 1 :
			 !strcmp(str, "y") ? 2 : -1;
		return k_signed;
	case S_INT:
		val->s = strtoll(str, &tail, 10);
		kind = k_signed;
		break;
	case S_HEX:
		val->u = strtoull(str, &tail, 16);
		kind = k_unsigned;
		break;
	case S_STRING:
	case S_UNKNOWN:
		val->s = strtoll(str, &tail, 0);
		kind = k_signed;
		break;
	default:
		return k_invalid;
	}
	return !errno && !*tail && tail > str && isxdigit(tail[-1])
	       ? kind : k_string;
}

tristate expr_calc_value(struct expr *e)
{
	tristate val1, val2;
	const char *str1, *str2;
	enum string_value_kind k1 = k_string, k2 = k_string;
	union string_value lval = {}, rval = {};
	int res;

	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:
	case E_GEQ:
	case E_GTH:
	case E_LEQ:
	case E_LTH:
	case E_UNEQUAL:
		break;
	default:
		printf("expr_calc_value: %d?\n", e->type);
		return no;
	}

	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);

	if (e->left.sym->type != S_STRING || e->right.sym->type != S_STRING) {
		k1 = expr_parse_string(str1, e->left.sym->type, &lval);
		k2 = expr_parse_string(str2, e->right.sym->type, &rval);
	}

	if (k1 == k_string || k2 == k_string)
		res = strcmp(str1, str2);
	else if (k1 == k_invalid || k2 == k_invalid) {
		if (e->type != E_EQUAL && e->type != E_UNEQUAL) {
			printf("Cannot compare \"%s\" and \"%s\"\n", str1, str2);
			return no;
		}
		res = strcmp(str1, str2);
	} else if (k1 == k_unsigned || k2 == k_unsigned)
		res = (lval.u > rval.u) - (lval.u < rval.u);
	else /* if (k1 == k_signed && k2 == k_signed) */
		res = (lval.s > rval.s) - (lval.s < rval.s);

	switch(e->type) {
	case E_EQUAL:
		return res ? no : yes;
	case E_GEQ:
		return res >= 0 ? yes : no;
	case E_GTH:
		return res > 0 ? yes : no;
	case E_LEQ:
		return res <= 0 ? yes : no;
	case E_LTH:
		return res < 0 ? yes : no;
	case E_UNEQUAL:
		return res ? yes : no;
	default:
		printf("expr_calc_value: relation %d?\n", e->type);
		return no;
	}
}

static int expr_compare_type(enum expr_type t1, enum expr_type t2)
{
	if (t1 == t2)
		return 0;
	switch (t1) {
	case E_LEQ:
	case E_LTH:
	case E_GEQ:
	case E_GTH:
		if (t2 == E_EQUAL || t2 == E_UNEQUAL)
			return 1;
	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;
}

static inline struct expr *
expr_get_leftmost_symbol(const struct expr *e)
{

	if (e == NULL)
		return NULL;

	while (e->type != E_SYMBOL)
		e = e->left.expr;

	return expr_copy(e);
}

/*
 * Given expression `e1' and `e2', returns the leaf of the longest
 * sub-expression of `e1' not containing 'e2.
 */
struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
{
	struct expr *ret;

	switch (e1->type) {
	case E_OR:
		return expr_alloc_and(
		    expr_simplify_unmet_dep(e1->left.expr, e2),
		    expr_simplify_unmet_dep(e1->right.expr, e2));
	case E_AND: {
		struct expr *e;
		e = expr_alloc_and(expr_copy(e1), expr_copy(e2));
		e = expr_eliminate_dups(e);
		ret = (!expr_eq(e, e1)) ? e1 : NULL;
		expr_free(e);
		break;
		}
	default:
		ret = e1;
		break;
	}

	return expr_get_leftmost_symbol(ret);
}

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_LEQ:
	case E_LTH:
		if (e->left.sym->name)
			fn(data, e->left.sym, e->left.sym->name);
		else
			fn(data, NULL, "<choice>");
		fn(data, NULL, e->type == E_LEQ ? "<=" : "<");
		fn(data, e->right.sym, e->right.sym->name);
		break;
	case E_GEQ:
	case E_GTH:
		if (e->left.sym->name)
			fn(data, e->left.sym, e->left.sym->name);
		else
			fn(data, NULL, "<choice>");
		fn(data, NULL, e->type == E_GEQ ? ">=" : ">");
		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)
{
	xfwrite(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 && sym->type != S_UNKNOWN)
		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);
}

Filemanager

Name Type Size Permission Actions
lxdialog Folder 0755
.conf.cmd File 110 B 0644
.conf.o.cmd File 5.42 KB 0644
.zconf.tab.o.cmd File 6.17 KB 0644
Makefile File 10.69 KB 0644
POTFILES.in File 361 B 0644
check.sh File 249 B 0755
conf File 120.25 KB 0755
conf.c File 15.75 KB 0644
conf.o File 25.48 KB 0644
confdata.c File 25.65 KB 0644
expr.c File 27.25 KB 0644
expr.h File 7.07 KB 0644
gconf.c File 38.17 KB 0644
gconf.glade File 25.04 KB 0644
images.c File 6.41 KB 0644
kconf_id.c File 1.89 KB 0644
kxgettext.c File 4.1 KB 0644
list.h File 3.66 KB 0644
lkc.h File 4.48 KB 0644
lkc_proto.h File 2.14 KB 0644
mconf.c File 27.74 KB 0644
menu.c File 17.53 KB 0644
merge_config.sh File 4.2 KB 0755
nconf.c File 38.54 KB 0644
nconf.gui.c File 14.77 KB 0644
nconf.h File 1.87 KB 0644
qconf.cc File 44.17 KB 0644
qconf.h File 7.37 KB 0644
streamline_config.pl File 16.17 KB 0755
symbol.c File 30.36 KB 0644
util.c File 2.91 KB 0644
zconf.l File 6.9 KB 0644
zconf.lex.c File 58.46 KB 0644
zconf.lex.c_shipped File 58.46 KB 0644
zconf.tab.c File 70.17 KB 0644
zconf.tab.c_shipped File 70.17 KB 0644
zconf.tab.o File 162.7 KB 0644
zconf.y File 16.01 KB 0644