parser done

1 files changed, 60 insertions, 0 deletions

diff --git a/src/parser.h b/src/parser.h
new file mode 100644
index 0000000..8fc5d6c
--- /dev/null
+++ b/src/parser.h
@@ -0,0 +1,60 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+#include "value.h"
+#include "lexer.h"
+
+typedef struct parser *parser_t;
+
+struct ast {
+    enum ast_type {
+        AST_SEXP,
+        AST_VALUE,
+        AST_TYPES // number of types
+    } type;
+
+    union {
+        struct sexp {
+            struct ast *children;
+            size_t nchildren;
+
+            struct sexp *prev;
+        } sexp;
+
+        value_t value;
+    };
+};
+
+struct parser {
+    struct sexp root;
+    struct sexp *cur_sexp;
+
+    struct quote_node {
+        struct sexp *cur_sexp;
+        struct quote_node *prev;
+    } *quote_head;
+
+    value_t begin_symbol_value;
+    value_t quote_symbol_value;
+};
+
+// allocate a parser
+// returns a parser on success and NULL on fail
+parser_t parser_create();
+
+// deallocate a parser
+void parser_destroy(parser_t parser);
+
+// reset a parser to its default state without destroying it
+// returns 0 on success
+void parser_reset(parser_t parser);
+
+// self explanatory
+void parser_print_ast(parser_t parser);
+
+// turn the given lexer (which has already has tokens) into an ast
+// returns 0 on success, > 0 when more tokens are needed,
+//         and < 0 on a fatal error
+int parser_parse_lexer(parser_t parser, lexer_t lexer);
+
+#endif