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#include <stdlib.h>
#include <string.h>
#include "lexer.h"
token_t init_token(tokenType_t type, void* value) {
token_t t;
t.type = type;
t.value = value;
return t;
}
tokenSet_t init_tokenset(token_t* tokens, int count) {
tokenSet_t tokenSet;
tokenSet.tokens = tokens;
tokenSet.count = count;
return tokenSet;
}
char* tttos(tokenType_t tokenType) {
switch (tokenType) {
case ERR:
return "ERR";
case EOL:
return "EOL";
case INDENT:
return "INDENT";
case STRING:
return "STRING";
case INT:
return "INT";
case OPEN_PAREN:
return "OPEN_PAREN";
case CLOSE_PAREN:
return "CLOSE_PAREN";
case START_COMMENT:
return "START_COMMENT";
default:
return "???";
}
}
int advance_whitespace(char** linePointer) {
int64_t a = (int64_t)linePointer;
while (**linePointer == ' ' || **linePointer == ' ') {
(*linePointer)++;
}
return (int)((int64_t)linePointer - a);
}
keyword_t try_get_keyword(char* name) {
if (strcmp(name, "VOID") == 0) {
return K_VOID;
}
else if (strcmp(name, "INT") == 0) {
return K_INT;
}
else if (strcmp(name, "FLOAT") == 0) {
return K_FLOAT;
}
else if (strcmp(name, "STRING") == 0) {
return K_STRING;
}
return K_NONE;
}
char keyword_is_type(keyword_t keyword) {
return keyword == K_VOID || keyword == K_INT
|| keyword == K_FLOAT || keyword == K_STRING;
}
token_t lex_first_token(char** content) {
int m = 8
char* s = malloc(sizeof(char) * m);
int c = 0;
advance_whitespace(content);
while (**content != '\n') {
s[c] = **content;
s[c+1] = '\0';
(*content)++;
/* check if we need to parse a string or an int */
//TODO: string parsing with quotes
/*if (s[c] >= 65 && s[c] <= 90) {
free(s);
(*content)--;
return lex_first_string(content);
}*/
if (s[c] >= 48 && s[c] <= 57) {
free(s);
(*content)--;
return lex_first_int(content);
}
else if (s[c] == ' ' || s[c] == '\n') {
if (strcmp(s, ";") == 0) {
free(s);
return init_token(SEMICOLON, NULL);
}
else if (strcmp(s, "(") == 0) {
free(s);
return init_token(OPEN_PAREN, NULL);
}
else if (strcmp(s, ")") == 0) {
free(s);
return init_token(CLOSE_PAREN, NULL);
}
else if (strcmp(s, "{") == 0) {
free(s);
return init_token(OPEN_BRACE, NULL);
}
else if (strcmp(s, "}") == 0) {
free(s);
return init_token(CLOSE_BRACE, NULL);
}
else if (strcmp(s, "[") == 0) {
free(s);
return init_token(OPEN_BRACKET, NULL);
}
else if (strcmp(s, "]") == 0) {
free(s);
return init_token(CLOSE_BRACKET, NULL);
}
else if (strcmp(s, "#") == 0 || strcmp(s, "//") == 0) {
free(s);
return init_token(START_COMMENT, NULL);
}
else if (strcmp(s, "=") == 0) {
free(s);
return init_token(EQUALS, NULL);
}
else if (strcmp(s, "==") == 0) {
free(s);
return init_token(DOUBLE_EQUALS, NULL);
}
else if (strcmp(s, "!") == 0) {
free(s);
return init_token(NEGATION, NULL);
}
else if (strcmp(s, "*") == 0) {
free(s);
return init_token(ASTERISK, NULL);
}
else if (strcmp(s, "+") == 0) {
free(s);
return init_token(PLUS_SIGN, NULL);
}
else if (strcmp(s, "func") == 0) {
free(s);
return init_token(FUNCTION, NULL);
}
keyword_t keyword = try_get_keyword(s);
if (keyword != K_NONE) {
free(s);
keyword* kp = malloc(sizeof(keyword_t));
*kp = keyword;
return init_token(KEYWORD, kp);
}
char* ns_p = malloc(sizeof(char) * c);
strcpy(ns_p, s);
free(s);
return init_token(NAME, ns_p);
}
else if (++c == m - 1) {
m *= 2;
s = realloc(s, sizeof(char) * m)
}
}
return init_token(EOL, NULL);
}
token_t lex_first_string(char** content) {
int m = 50;
char* s = malloc(sizeof(char) * m);
int c = 0;
advance_whitespace(content);
while (**content >= 65 && **content <= 90) {
s[c] = **content;
(*content)++;
c++;
}
s[c] = '\0';
return init_token(STRING, s);
}
token_t lex_first_int(char** content) {
int m = 10;
char* s = malloc(sizeof(char) * m);
int c = 0;
advance_whitespace(content);
while (**content >= 48 && **content <= 57) {
s[c] = **content;
(*content)++;
c++;
}
s[c] = '\0';
int* ip = malloc(sizeof(int));
*ip = atoi(s);
free(s);
return init_token(INT, (void*)ip);
}
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