added loader, error handling and cli. tests needed

1 files changed, 116 insertions, 0 deletions

diff --git a/src/error.c b/src/error.c
new file mode 100644
index 0000000..8475d66
--- /dev/null
+++ b/src/error.c
@@ -0,0 +1,116 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2015 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file COPYING.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include "utils/utils.h"
+#include "error.h"
+
+
+blogc_error_t*
+blogc_error_new(blogc_error_type_t type, const char *msg)
+{
+    blogc_error_t *err = malloc(sizeof(blogc_error_t));
+    err->type = type;
+    err->msg = b_strdup(msg);
+    return err;
+}
+
+
+blogc_error_t*
+blogc_error_new_printf(blogc_error_type_t type, const char *format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    char *tmp = b_strdup_vprintf(format, ap);
+    va_end(ap);
+    blogc_error_t *rv = blogc_error_new(type, tmp);
+    free(tmp);
+    return rv;
+}
+
+
+blogc_error_t*
+blogc_error_parser(blogc_error_type_t type, const char *src, size_t src_len,
+    size_t current, const char *format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    char *msg = b_strdup_vprintf(format, ap);
+    va_end(ap);
+
+    b_string_t *str = b_string_new();
+    while (current < src_len) {
+        char c = src[current];
+
+        if (c == '\r' || c == '\n')
+            break;
+
+        b_string_append_c(str, c);
+
+        current++;
+    }
+    char *line = b_string_free(str, false);
+
+    blogc_error_t *rv = NULL;
+
+    if (strlen(line) == 0)  // "near to" message isn't useful if line is empty
+        rv = blogc_error_new(type, msg);
+    else
+        rv = blogc_error_new_printf(type,
+            "%s\nError occurred near to \"%s\".", msg, line);
+
+    free(msg);
+    free(line);
+
+    return rv;
+}
+
+
+void
+blogc_error_print(blogc_error_t *err)
+{
+    if (err == NULL)
+        return;
+
+    char *tmp = NULL;
+
+    switch(err->type) {
+        case BLOGC_ERROR_SOURCE_PARSER:
+            tmp = b_strdup("Source parser error");
+            break;
+        case BLOGC_ERROR_TEMPLATE_PARSER:
+            tmp = b_strdup("Template parser error");
+            break;
+        case BLOGC_ERROR_LOADER:
+            tmp = b_strdup("Loader error");
+            break;
+        default:
+            tmp = b_strdup("Unknown error");
+    }
+
+    fprintf(stderr, "%s: %s\n", tmp, err->msg);
+
+    free(tmp);
+}
+
+
+void
+blogc_error_free(blogc_error_t *err)
+{
+    if (err == NULL)
+        return;
+    free(err->msg);
+    free(err);
+}