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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
#include "lexer.h"
#define CH(lexer) (lexer)->str[(lexer)->str_idx]
#define TOKEN_SEPARATOR_TABLE(X, l) \
X(('(' == CH(l)), on_separator(l, TOKEN_LP)) \
X((')' == CH(l)), on_separator(l, TOKEN_RP)) \
X(('\''== CH(l)), on_separator(l, TOKEN_QUOTE)) \
X((',' == CH(l)), on_separator(l, TOKEN_UNQUOTE)) \
X(isspace(CH(l)), on_separator(l, TOKEN_NONE)) \
X(TABLE_ELSE, acc_add_char(l, CH(l)))
#define SET_TYPE(lexer, ttype) (lexer)->token.type = (ttype)
#define SET_VALUE(lexer, member, tvalue) (lexer)->token.value.member = (tvalue)
#define TOKEN_VALUE_TABLE(X, l) \
X(is_int(l->acc, &l->token.value.num), \
SET_TYPE(l, TOKEN_INT)) \
X(is_special(l->acc, &l->token.type), \
;) \
X(TABLE_ELSE, \
SET_TYPE(l, TOKEN_ID); \
SET_VALUE(l, id, l->acc))
#define TOKEN_SPECIALS_TABLE(X) \
X(TOKEN_DOT, ".") \
X(TOKEN_LAMBDA, "lambda") \
X(TOKEN_DEFINE, "define") \
X(TOKEN_QUOTE_FORM, "quote")
#define TOKEN_VALUE_STRING_TABLE(X, tvalue) \
X(TOKEN_LP, "(") \
X(TOKEN_RP, ")") \
X(TOKEN_QUOTE, "'") \
X(TOKEN_UNQUOTE, ",") \
X(TOKEN_ID, "%s", tvalue.id) \
X(TOKEN_STR, "%s", tvalue.str) \
X(TOKEN_INT, "%d", tvalue.num) \
TOKEN_SPECIALS_TABLE(X) \
X(TOKEN_NONE, "(none)")
#define TABLE_ELSE 1
#define TABLE_END {}
#define CALLBACK(test, callback) \
if(test) { \
ERR_NZ(callback, r, return r); \
} else
#define CALLBACK_BLIND(test, callback) \
if(test) { \
callback; \
} else
#define LEN(arr) (sizeof(arr)/sizeof(*(arr)))
const char * const token_type_string[] = {
TOKEN_TYPES(TO_STRING)
};
static int on_separator(lexer_t lexer, enum token_type type);
static int acc_add_char(lexer_t lexer, char ch);
static int acc_empty(lexer_t lexer);
static int is_int(char *str, int *num);
static int is_special(char *str, enum token_type *type);
lexer_t lexer_create(FILE *fp)
{
lexer_t lexer = malloc(sizeof(*lexer));
lexer->fp = fp;
lexer->line = 0;
lexer->str_idx = 0;
lexer->acc_idx = 0;
memset(lexer->acc, 0, sizeof(lexer->acc));
memset(lexer->str, 0, sizeof(lexer->str));
lexer->token.type = TOKEN_NONE;
return lexer;
}
void lexer_destroy(lexer_t lexer)
{
if(!lexer) return;
free(lexer);
}
int lexer_token_next(lexer_t lexer, struct token *token)
{
if(lexer->acc_idx == 0 && lexer->acc[0] != '\0') {
memset(lexer->acc, 0, sizeof(lexer->acc));
}
while(lexer->token.type == TOKEN_NONE)
{
if(lexer->str[lexer->str_idx] == '\0') {
ERR_Z(fgets(lexer->str, LEN(lexer->str), lexer->fp), return -EIO);
lexer->str_idx = 0;
lexer->line++;
}
TOKEN_SEPARATOR_TABLE(CALLBACK, lexer) TABLE_END;
}
*token = lexer->token;
lexer->token.type = TOKEN_NONE;
return 0;
}
int token_value_string(struct token *token, size_t buf_sz, char *buf)
{
#define AS_STRING(ttype, ...) \
case ttype: return snprintf(buf, buf_sz, __VA_ARGS__);
switch(token->type) {
TOKEN_VALUE_STRING_TABLE(AS_STRING, token->value);
}
return 0;
}
#define STR_ALLOC_COPY(dest, str) do { \
size_t len = strlen(str) + 1; \
dest = malloc(len); \
memcpy((dest), (str), len); \
} while(0)
void token_clone(struct token *dest, struct token *src)
{
dest->type = src->type;
switch(src->type) {
case TOKEN_ID:
STR_ALLOC_COPY(dest->value.id, src->value.id);
return;
case TOKEN_STR:
STR_ALLOC_COPY(dest->value.str, src->value.str);
return;
case TOKEN_INT:
dest->value.num = src->value.num;
return;
default: return;
}
}
void token_dealloc(struct token *token)
{
switch(token->type) {
case TOKEN_ID:
free(token->value.id);
return;
case TOKEN_STR:
free(token->value.str);
return;
default: return;
}
}
static int on_separator(lexer_t lexer, enum token_type type)
{
if(lexer->acc_idx > 0) return acc_empty(lexer);
lexer->token.type = type;
lexer->str_idx++;
return 0;
}
static int acc_add_char(lexer_t lexer, char ch)
{
if(lexer->acc_idx >= LEN(lexer->acc) - 1) {
return -ENAMETOOLONG;
}
lexer->acc[lexer->acc_idx++] = ch;
lexer->str_idx++;
return 0;
}
static int acc_empty(lexer_t lexer)
{
TOKEN_VALUE_TABLE(CALLBACK_BLIND, lexer) TABLE_END;
lexer->acc_idx = 0;
return 0;
}
static int is_int(char *str, int *num)
{
char *endptr = str;
long _num = strtol(str, &endptr, 10);
if(*endptr != '\0') return 0;
*num = (int)_num;
return 1;
}
static int is_special(char *str, enum token_type *type)
{
#define IS_SPECIAL(ttype, sstr) \
if(strcmp(sstr, str) == 0) { \
*type = ttype; \
return 1; \
} else
TOKEN_SPECIALS_TABLE(IS_SPECIAL) TABLE_END;
return 0;
}
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