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#include <stdio.h>
#include <string.h>
#include "common.h"
#include "scanner.h"
typedef struct {
const char *start;
const char *current;
int line;
} Scanner;
Scanner scanner;
void initScanner(const char *source) {
scanner.start = source;
scanner.current = source;
scanner.line = 1;
}
static bool isAtEnd() { return *scanner.current == '\0'; }
static Token makeToken(TokenType type) {
Token token;
token.type = type;
token.start = scanner.start;
token.length = (int)(scanner.current - scanner.start);
token.line = scanner.line;
return token;
}
static Token errorToken(const char *message) {
Token token;
token.type = TOKEN_ERROR;
token.start = message;
token.length = (int)strlen(message);
token.line = scanner.line;
return token;
}
Token scanToken() {
scanner.start = scanner.current;
if (isAtEnd())
return makeToken(TOKEN_EOF);
return errorToken("Unexpected character.");
}
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