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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"
int parse_input(char *);
int parse_module(char *);
int parse_expr(char *);
struct tok_lookup {
char *str;
int (*handler)(char*);
};
struct op_lookup {
char *str;
enum BINARY (*handler)(enum BINARY, enum BINARY);
};
static struct op_lookup uop_handlers[] = {
{.str = "not", .handler = logic_nand},
};
static struct op_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}
};
static struct tok_lookup tok_handlers[] = {
{.str = "input", .handler = parse_input},
{.str = "module", .handler = parse_module},
{.str = "expr", .handler = parse_expr}
};
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;
}
char *
eat_whitespace(char *string) {
while (*string && isspace(*string)) {
string++;
}
return string;
}
int parse_uop(char *str, char *name, enum BINARY (*handler)(enum BINARY, enum BINARY)) {
char *gate_name = str;
strtok(gate_name, " ");
/* FIXME allow input from other gates, not just inputs */
struct gate *in = gate_get_input_by_name(gate_name);
gate_add(name, handler, in, in);
return 0;
}
int parse_bop(char *str, char *name, enum BINARY (*handler)(enum BINARY, enum BINARY)) {
char *gate_name1 = str;
char *gate_name2 = NULL;
strtok(gate_name1, " ");
gate_name2 = gate_name1 + strlen(gate_name1) + 1;
strtok(gate_name2, " ");
/* FIXME allow input from other gates, not just inputs */
struct gate *in1 = gate_get_input_by_name(gate_name1);
struct gate *in2 = gate_get_input_by_name(gate_name2);
gate_add(name, handler, in1, in2);
return 0;
}
int
parse_op(char *str, char *name) {
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(str+strlen(str)+1, name, 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(str+strlen(str)+1, name, 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;
/* 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);
return parse_op(op, ident);
}
int
parse_input(char *str) {
strtok(str, " ");
str = eat_whitespace(str);
emit_info("Add input '%s'\n", str);
gate_input_add(str);
return 0;
}
int
parse_module(char *str) {
printf("FIXME module name is \"%s\" but modules are not implemented\n", str);
return 0;
}
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;
}
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