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#include <stdlib.h>
#include <stdio.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 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";
case JUSTIFICATION:
return "JUSTIFICATION";
case PREMISE:
return "PREMISE";
case NEGATION:
return "NEGATION";
case ASSUMPTION:
return "ASSUMPTION";
case CONJUNCTION:
return "CONJUNCTION";
case DISJUNCTION:
return "DISJUNCTION";
case IMPLICATION:
return "IMPLICATION";
case BI_IMPLICATION:
return "BI_IMPLICATION";
default:
return "???";
}
}
int advance_whitespace(char** linePointer) {
int64_t a = (int64_t)linePointer;
while (**linePointer == ' ' || **linePointer == ' ') {
(*linePointer)++;
}
return (int)((int64_t)linePointer - a);
}
tokenSet_t lex_line(char* line) {
char** p = malloc(sizeof(char*));
*p = line;
int m = 50;
token_t* tokens = malloc(sizeof(token_t) * m);
int i = 0;
while (1) {
token_t t = lex_first_token(p);
if (t.type == EOL) {
printf("eol\n");
break;
}
if (t.type == ERR) {
exit(1);
}
printf("good\n");
tokens[i] = t;
i++;
}
free(p);
return init_tokenset(tokens, i);
}
token_t lex_first_token(char** content) {
int m = 5;
char* s = malloc(sizeof(char) * m);
int c = 0;
advance_whitespace(content);
while (**content != '\n') {
s[c] = **content;
s[c+1] = '\0';
(*content)++;
printf("lexing: %c\n", s[c]);
/* check if we need to parse a string or an int */
if (s[c] >= 65 && s[c] <= 90) {
free(s);
(*content)--;
return lex_first_string(content);
}
else if (s[c] >= 48 && s[c] <= 57) {
free(s);
(*content)--;
return lex_first_int(content);
}
/* otherwise, check to see if a symbol has been matched */
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(START_COMMENT, NULL);
}
else if (strcmp(s, "|") == 0) {
free(s);
return init_token(JUSTIFICATION, NULL);
}
else if (strcmp(s, "pr") == 0) {
free(s);
return init_token(PREMISE, NULL);
}
else if (strcmp(s, "as") == 0) {
free(s);
return init_token(ASSUMPTION, NULL);
}
else if (strcmp(s, "i") == 0) {
free(s);
return init_token(INTRODUCTION, NULL);
}
else if (strcmp(s, "e") == 0) {
free(s);
return init_token(ELIMINATION, NULL);
}
else if (strcmp(s, "~") == 0) {
free(s);
return init_token(NEGATION, NULL);
}
else if (strcmp(s, "^") == 0) {
free(s);
return init_token(CONJUNCTION, NULL);
}
else if (strcmp(s, "v") == 0) {
free(s);
return init_token(DISJUNCTION, NULL);
}
else if (strcmp(s, "->") == 0) {
free(s);
return init_token(IMPLICATION, NULL);
}
else if (strcmp(s, "<-") == 0) {
free(s);
return init_token(BI_IMPLICATION, NULL);
}
else if (c <= m) {
printf("c: %d\n", c);
c++;
continue;
}
else {
free(s);
return init_token(ERR, NULL);
}
}
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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