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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "common.h"
#include "lexer.h"
#include "value.h"
// TODO: handle escaping
// saves a token with no data
// returns the index of the saved token; < 0 on fail
static int token_add(toklist_t *tokens, enum token_enum type);
// saves a token with an identifier (lexer -> iden)
// returns 0 on success
static int token_add_iden(toklist_t *tokens, char *iden, size_t *iden_sz);
// used for tokens that separate things
// if type is TOKEN_TOKENS, then no empty token will be saved
// returns 0 on success, < 0 on fail, and > 0 to skip the token (add it in iden)
static int on_generic_separator(lexer_t lexer, toklist_t *tokens, enum token_enum type);
static int on_double_quote(lexer_t lexer, toklist_t *tokens);
#define EQ(ch) ch ==
#define SEPARATOR_CALLBACK_TBL(X, ...) \
/* X(test, what to execute if the test succeeds) */ \
X(EQ('('), on_generic_separator(__VA_ARGS__, TOKEN_PARENTHS_OPEN); lexer->scope_depth++) \
X(EQ(')'), on_generic_separator(__VA_ARGS__, TOKEN_PARENTHS_CLOSE); lexer->scope_depth--) \
X(EQ('\''), on_generic_separator(__VA_ARGS__, TOKEN_SPECIAL_QUOTE)) \
X(EQ('"'), on_double_quote(__VA_ARGS__)) \
X(isspace, on_generic_separator(__VA_ARGS__, TOKEN_TOKENS))
#define FN(fn, arg) "%s", fn(arg, buf, buf_sz)
#define MANAGE_TOKEN_TBL(X, token) \
/* X(type, how to free, how to print) */ \
X(TOKEN_PARENTHS_OPEN, ;, "(") \
X(TOKEN_PARENTHS_CLOSE, ;, ")") \
X(TOKEN_SPECIAL_QUOTE, ;, "'") \
X(TOKEN_VALUE, value_destroy(token->value), FN(value_string, token->value)) \
X(TOKEN_TOKENS, ;, "") \
// ---------- Exported Functions ---------- //
// makes an if-else chain to test the character
// agains the separator callback table
#define CHECK_SEPARATOR_AND_CALLBACK(test_func, callback) \
if(test_func(str[i])) { \
callback_ret = callback; \
if(callback_ret == 0) { \
continue; \
} else if(callback_ret < 0) { \
err(#callback ": failed"); \
return 1; \
} \
} else
int lexer_tokenize(lexer_t lexer, toklist_t *toklist, char *str, size_t len)
{
int callback_ret = 0;
for(size_t i = 0; i < len; i++)
{
SEPARATOR_CALLBACK_TBL(CHECK_SEPARATOR_AND_CALLBACK, lexer, toklist);
if(lexer->iden_sz >= LEXER_IDEN_CAP - 1) { // -1 to be null-terminated
err("LEXER_IDEN_CAP of %ld reached", lexer->iden_sz);
return 1;
}
// add charater to identifier
lexer->iden[lexer->iden_sz++] = str[i];
}
return 0;
}
lexer_t lexer_create()
{
lexer_t lexer = xmalloc(sizeof(struct lexer));
lexer_reset(lexer);
return lexer;
}
#define CASE_FREE(type, free_func, ...) case type: free_func; break;
void lexer_destroy(lexer_t lexer)
{
if(!lexer) return;
free(lexer);
}
void lexer_reset(lexer_t lexer)
{
memset(lexer->iden, 0, LEXER_IDEN_CAP);
lexer->iden_sz = 0;
lexer->inside_string = false;
lexer->scope_depth = 0;
}
void toklist_reset(toklist_t *toklist)
{
for(size_t i = 0; i < toklist->ntokens; i++) {
struct token *token = &toklist->tokens[i];
switch(token->type) {
MANAGE_TOKEN_TBL(CASE_FREE, token);
default:
err("lexer_reset: Unknown token type given");
break;
}
token->type = TOKEN_TOKENS;
token->value = NULL;
}
toklist->ntokens = 0;
}
// print based on the given way to print
#define CASE_PRINT(type, free_func, ...) case type: info("\n\t" #type "\n\t" __VA_ARGS__); break;
void toklist_print(toklist_t *toklist)
{
// for the printing (see MANAGE_TOKEN_TBL)
char buf[LEXER_IDEN_CAP];
size_t buf_sz = LEXER_IDEN_CAP;
for(size_t i = 0; i < toklist->ntokens; i++) {
struct token *token = &toklist->tokens[i];
switch(token->type) {
MANAGE_TOKEN_TBL(CASE_PRINT, token);
default:
err("lexer_print_tokens: Unknown token given");
return;
}
}
}
bool lexer_has_finished(lexer_t lexer)
{
if(!lexer->inside_string && lexer->scope_depth == 0) return true;
return false;
}
// ---------- Callback Functions ----------- //
static int on_double_quote(lexer_t lexer, toklist_t *toklist)
{
int ret = on_generic_separator(lexer, toklist, TOKEN_TOKENS);
if(ret < 0) {
return ret;
} else if(ret == 0) {
lexer->inside_string = 1;
return 1;
}
if(token_add_iden(toklist, lexer->iden, &lexer->iden_sz)) {
err("token_add_iden: failed");
return -1;
}
lexer->inside_string = 0;
return 0;
}
static int on_generic_separator(lexer_t lexer, toklist_t *toklist, enum token_enum type)
{
if(lexer->inside_string) {
return 1;
}
if(token_add_iden(toklist, lexer->iden, &lexer->iden_sz)) {
err("token_add_iden: failed");
return -1;
}
if(type != TOKEN_TOKENS) {
if(token_add(toklist, type) < 0) {
err("token_add: failed");
return -1;
}
}
return 0;
}
// ---------- Token Functions ----------- //
static int token_add(toklist_t *toklist, enum token_enum type)
{
if(toklist->ntokens >= LEXER_TOK_CAP) {
err("tokens_cap of %ld has been reached", toklist->ntokens);
return -1;
}
toklist->tokens[toklist->ntokens].type = type;
return toklist->ntokens++;
}
static int token_add_iden(toklist_t *toklist, char *iden, size_t *iden_sz)
{
int ret = 1;
if(*iden_sz == 0) return 0;
int i = token_add(toklist, TOKEN_VALUE);
if(i < 0) {
err("token_add: failed");
goto exit;
}
value_t value = value_create(VALUE_LITERAL, iden, &ret);
if(ret > 0) {
value = value_create(VALUE_SYMBOL, iden, &ret);
} else if(ret < 0) {
err("value_create: failed");
goto exit;
}
toklist->tokens[i].value = value;
exit:
memset(iden, 0, *iden_sz);
*iden_sz = 0;
return ret;
}
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