Initial commit, basic lexer structure

src/main.c

@@ -0,0 +1,62 @@
+#include "error.h"
+#include "lexer.h"
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+bool print_token(lexer_token_t *token) {
+    lexer_token_print(token);
+    return true;
+}
+
+bool print_value(lexer_token_t *token) {
+    if (token->id == TOKEN_ERROR) {
+        printf("%s\n", token->value);
+        for (size_t i = 0; i < token->character_number; ++i)
+            printf(" ");
+        printf("^-- %s\n", token->explanation);
+    } else {
+        printf("%s", token->value);
+    }
+    return token->id != TOKEN_ERROR;
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 3 ||
+        (strcmp(argv[1], "-tokens") != 0 && strcmp(argv[1], "-text") != 0)) {
+        puts("Usage: oas -tokens <filename>");
+        puts("Usage: oas -text <filename>");
+        return 1;
+    }
+
+    bool (*print_fn)(lexer_token_t *);
+    char *filename = argv[2];
+    if (strcmp(argv[1], "-tokens") == 0) {
+        print_fn = print_token;
+    } else {
+        print_fn = print_value;
+    }
+
+    lexer_t lex = {0};
+    lexer_token_t token;
+    error_t *err = lexer_open(&lex, filename);
+    if (err) {
+        puts(err->message);
+        error_free(err);
+        return 1;
+    }
+
+    bool keep_going = true;
+    while (keep_going && (err = lexer_next(&lex, &token)) == nullptr) {
+        keep_going = print_fn(&token);
+        free(token.value);
+    }
+
+    if (err && err != err_eof) {
+        puts(err->message);
+    }
+    error_free(err);
+    return 0;
+}