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#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "error.h"
#include "logic.h"
#include "gate.h"
enum STATEMENT_TYPE {
DECL_EXPR,
DECL_INPUT,
DECL_OUTPUT,
MODULE_NAME
};
enum UNARY_OPERATOR {
UOP_NOT
};
enum BINARY_OPERATOR {
BOP_AND,
BOR_OR,
BOP_NAND,
BOP_NOR,
BOP_XOR
};
struct tok_lookup {
char *str;
int (*handler)(char*);
};
struct bop_lookup {
char *str;
enum BINARY (*handler)(enum BINARY, enum BINARY);
};
struct uop_lookup {
char *str;
enum BINARY (*handler)(enum BINARY);
};
static struct uop_lookup uop_handlers[] = {
{.str = "not", .handler = logic_not},
};
static struct bop_lookup bop_handlers[] = {
{.str = "and", .handler = logic_and},
{.str = "or", .handler = logic_or},
{.str = "nand", .handler = logic_nand},
{.str = "nor", .handler = logic_nor},
{.str = "xor", .handler = logic_xor}
};
int
expect(const char *expect, char *actual) {
int min_len = 0;
min_len = MIN(strlen(expect), strlen(actual));
if (strncmp(expect, actual, min_len) != 0) {
emit_error("Expected '%s' at start of '%s'\n", expect, actual);
return 1;
}
return 0;
}
int parse_uop(char *str, enum BINARY (*handler)(enum BINARY)) {
/**/
(void)str;
(void)handler;
emit_error("uop unimplemented\n");
return 0;
}
int parse_bop(char *str, enum BINARY (*handler)(enum BINARY, enum BINARY)) {
/**/
(void)str;
(void)handler;
emit_error("bop unimplemented\n");
return 0;
}
int
parse_op(char *str) {
int match = 0;
size_t i = 0;
strtok(str, " ");
match = 0;
for (i = 0; i < sizeof(bop_handlers)/sizeof(bop_handlers[0]); i++) {
if (strcmp(bop_handlers[i].str, str) == 0) {
match = 1;
if (parse_bop("FIXME", bop_handlers[i].handler)) {
return 1;
}
}
}
for (i = 0; i < sizeof(uop_handlers)/sizeof(uop_handlers[0]); i++) {
if (strcmp(uop_handlers[i].str, str) == 0) {
match = 1;
if (parse_uop("FIXME", uop_handlers[i].handler)) {
return 1;
}
}
}
if (match == 0) {
emit_error("Invalid operator \"%s\"\n", str);
return 1;
}
return 0;
}
int
parse_expr(char *str) {
const char *expr_sep = ": ";
size_t ident_len = 0;
char *ident = NULL;
char *op = NULL;
printf("expression %s\n", str);
/* FIXME magic constant string */
ident_len = strspn(str, "abcdefghijklmnopqrstuvwxyz0123456789");
if (expect(expr_sep, str + ident_len)) {
return -1;
}
str[ident_len] = '\0';
ident = str;
op = str + ident_len + strlen(expr_sep);
/* FIXME do something with the identifier */
return parse_op(op);
}
int
parse_node(char *str) {
enum NODE_TYPE type = NODE_OUTPUT;
strtok(str, " ");
if (strcmp(str, "output") == 0) {
type = NODE_OUTPUT;
} else if (strcmp(str, "input") == 0) {
type = NODE_INPUT;
} else {
emit_error("'%s' is not a valid node type\n", str);
return 1;
}
printf("FIXME need to add node of type %s\n", type == NODE_OUTPUT ? "oot" : "innnn");
return 0;
}
int
parse_module(char *str) {
printf("FIXME module name is \"%s\" but modules are not implemented\n", str);
return 0;
}
static struct tok_lookup tok_handlers[] = {
{.str = "node", .handler = parse_node},
{.str = "module", .handler = parse_module},
{.str = "expr", .handler = parse_expr}
};
int
parse_line(char *line) {
size_t i = 0;
char *tok = line;
char *delim = " ";
int match = 0;
if ( strlen(line) == 0
|| (strlen(line) == 1 && isspace(line[0]))) {
return 0;
}
tok = strtok(line, delim);
match = 0;
for (i = 0; i < sizeof(tok_handlers)/sizeof(tok_handlers[0]); i++) {
if (strcmp(tok_handlers[i].str, tok) == 0) {
match = 1;
if ((tok_handlers[i].handler)(&tok[strlen(tok)+1])) {
return 1;
}
}
}
if (match == 0) {
emit_error("invalid token \"%s\"", tok);
return 1;
}
return 0;
}
int main(void) {
char buf[4096];
FILE *fd = stdin;
while (NULL != fgets(buf, sizeof(buf), fd)) {
buf[strcspn(buf, "\r\n")] = '\0';
if (parse_line(buf)) {
return 1;
}
}
return 0;
}
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