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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lex.h"
#include "common.h"
#include "error.h"
#include "logic.h"
#include "gate.h"
static FILE* fd;
static struct token *cursor;
static const char *filename;
#define EXPECT_AND_DISCARD_CRITICAL(type)\
do { \
EXPECT_CRITICAL(type) \
kerchunk(); \
} while (0);
#define EXPECT_CRITICAL(type)\
do { \
if (expect(type)) { \
return 1; \
} \
} while (0);
/* FIXME change to varadic fuction */
#define emit(...) \
if (cursor) { \
fprintf(stderr, "%s at (%zd,%zd): ", filename, cursor->loc.line, cursor->loc.column); \
fprintf(stderr, __VA_ARGS__); \
indicate_file_area(fd, cursor->loc.line, cursor->loc.column - cursor->loc.leading_whitespace_len, cursor->span); \
} else { \
fprintf(stderr, "%s: ", filename); \
fprintf(stderr, __VA_ARGS__); \
}
//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}
//};
static int
expect(enum TOKEN_TYPE e) {
const char *expected_desc = "(internal error)";
const char *observed_desc = "(internal error)";
if (!cursor || cursor->type != e) {
expected_desc = get_token_description(e);
if (cursor) {
observed_desc = get_token_description(cursor->type);
} else {
observed_desc = "end of file";
}
emit("Error: Expected %s, got %s\n", expected_desc, observed_desc);
return 1;
}
return 0;
}
static void
kerchunk() {
if (cursor) {
cursor = cursor->next;
}
}
int
parse_expr(void) {
/* FIXME write wrapper to exit on fail */
EXPECT_AND_DISCARD_CRITICAL(TOK_EXPR);
EXPECT_AND_DISCARD_CRITICAL(TOK_IDENT); /* FIXME do something, don't discard */
EXPECT_AND_DISCARD_CRITICAL(TOK_COLON);
switch(cursor->type) {
/* FIXME do some things */
case TOK_OR : /* fallthrough */
case TOK_AND: /* fallthrough */
case TOK_XOR:
kerchunk();
EXPECT_AND_DISCARD_CRITICAL(TOK_IDENT); /* FIXME don't discard */
EXPECT_AND_DISCARD_CRITICAL(TOK_IDENT); /* FIXME don't discard */
break;
case TOK_NOT:
kerchunk();
EXPECT_AND_DISCARD_CRITICAL(TOK_IDENT); /* FIXME don't discard */
break;
default:
emit("Error: Unexpected %s\n", get_token_description(cursor->type));
return 1;
}
return 0;
}
int
parse(const char *fname, FILE *f, struct token *t) {
fd = f;
filename = fname;
cursor = t;
/* Eat leading EOL tokens */
while (cursor && cursor->type == TOK_EOL) {
kerchunk();
}
EXPECT_AND_DISCARD_CRITICAL(TOK_MODULE);
EXPECT_CRITICAL(TOK_IDENT);
emit("Debug: module is named %s\n", cursor->value);
/* FIXME do something */
kerchunk();
EXPECT_AND_DISCARD_CRITICAL(TOK_EOL);
while (cursor) {
switch(cursor->type) {
case TOK_EOL:
kerchunk();
break;
case TOK_INPUT:
kerchunk();
expect(TOK_IDENT);
emit("Debug: input is named %s\n", cursor->value);
/* FIXME do something */
kerchunk();
break;
case TOK_EXPR:
parse_expr();
break;
default:
emit("Error: Unexpected %s\n", get_token_description(cursor->type));
return 1;
}
}
return 0;
}
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