Initial implementation

reader.h

@@ -0,0 +1,98 @@
+/* Copyright (C) 2025 Aryadev Chavali
+
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+ * details.
+
+ * You may distribute and modify this code under the terms of the GNU General
+ * Public License Version 2, which you should have received a copy of along with
+ * this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+ * Created: 2025-04-16
+ * Description: Parsing Lisp!
+ */
+
+#ifndef READER_H
+#define READER_H
+
+#include "./lisp.h"
+#include "./memory.h"
+#include "./vec.h"
+
+#define INPUT_CHUNK_SIZE 512
+static const char SYM_CHARS[] =
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+    "¬!£$%^&*_-+={[]}:@~#<,>.?/";
+
+typedef struct
+{
+  const char *name;
+  u64 offset;
+  sv_t str;
+} input_t;
+
+void input_from_sv(context_t *ctx, input_t *inp, const char *name, sv_t sv);
+void input_from_fp(context_t *ctx, input_t *input, const char *name, FILE *fp);
+bool input_eof(input_t *input);
+
+typedef struct
+{
+  u64 col, line;
+} pos_t;
+
+pos_t input_offset_to_pos(input_t *inp);
+
+typedef enum
+{
+  PERR_OK = 0,
+  PERR_EOF,
+  PERR_UNEXPECTED_CHAR,
+  PERR_EXPECTED_CLOSE_BRACKET,
+  PERR_EXPECTED_SPEECH_MARK,
+  PERR_UNEXPECTED_READER_MACRO_SYMBOL,
+  PERR_EXPECTED_BOOLEAN,
+} perr_t;
+
+static inline const char *perr_to_cstr(perr_t perr)
+{
+  switch (perr)
+  {
+  case PERR_OK:
+    return "OK";
+    break;
+  case PERR_EOF:
+    return "EOF";
+    break;
+  case PERR_UNEXPECTED_CHAR:
+    return "UNEXPECTED_CHAR";
+    break;
+  case PERR_EXPECTED_CLOSE_BRACKET:
+    return "EXPECTED_CLOSE_BRACKET";
+    break;
+  case PERR_EXPECTED_SPEECH_MARK:
+    return "EXPECTED_SPEECH_MARK";
+    break;
+  case PERR_UNEXPECTED_READER_MACRO_SYMBOL:
+    return "UNEXPECTED_READER_MACRO_SYMBOL";
+    break;
+  case PERR_EXPECTED_BOOLEAN:
+    return "EXPECTED_BOOLEAN";
+    break;
+  }
+  assert(false && "perr_to_cstr: unreachable");
+  return "";
+}
+
+typedef struct
+{
+  lisp_t *result;
+  perr_t error;
+} pres_t;
+
+perr_t parse(context_t *ctx, input_t *str, lisp_t **ret);
+perr_t parse_all(context_t *ctx, input_t *str, vec_t *vec);
+
+int print_perror(FILE *fp, input_t *inp, perr_t error);
+
+#endif