From 2a11acc66738d6300bfa90a22adcd540371060f3 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Fri, 11 Sep 2020 01:28:06 -0700
Subject: Major overhaul refactor restructuring

---
 types.h | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 types.h

(limited to 'types.h')

diff --git a/types.h b/types.h
new file mode 100644
index 0000000..ef62cdc
--- /dev/null
+++ b/types.h
@@ -0,0 +1,89 @@
+/*
+ * types.h - Datatypes used by BPEG
+ */
+#ifndef TYPES__H
+#define TYPES__H
+
+#include <sys/types.h>
+
+/*
+ * BPEG virtual machine opcodes
+ */
+enum VMOpcode {
+    VM_EMPTY = 0,
+    VM_ANYCHAR = 1,
+    VM_ANYTHING_BUT,
+    VM_STRING,
+    VM_RANGE,
+    VM_NOT,
+    VM_UPTO_AND,
+    VM_REPEAT,
+    VM_BEFORE,
+    VM_AFTER,
+    VM_CAPTURE,
+    VM_OTHERWISE,
+    VM_CHAIN,
+    VM_REPLACE,
+    VM_REF,
+};
+
+/*
+ * A struct reperesenting a BPEG virtual machine operation
+ */
+typedef struct vm_op_s {
+    enum VMOpcode op;
+    unsigned int multiline:1;
+    const char *start, *end;
+    // Length of the match, if constant, otherwise -1
+    ssize_t len;
+    union {
+        const char *s;
+        struct {
+            char low, high;
+        } range;
+        struct {
+            ssize_t min, max;
+            struct vm_op_s *sep, *repeat_pat;
+        } repetitions;
+        // TODO: use a linked list instead of a binary tree
+        struct {
+            struct vm_op_s *first, *second;
+        } multiple;
+        struct {
+            struct vm_op_s *replace_pat;
+            const char *replacement;
+        } replace;
+        struct {
+            struct vm_op_s *capture_pat;
+            char *name;
+        } capture;
+        struct vm_op_s *pat;
+    } args;
+} vm_op_t;
+
+/*
+ * Pattern matching result object
+ */
+typedef struct match_s {
+    // Where the match starts and ends (end is after the last character)
+    const char *start, *end;
+    unsigned int is_capture:1, is_replacement:1, is_ref:1;
+    const char *name_or_replacement;
+    struct match_s *child, *nextsibling;
+    vm_op_t *op;
+} match_t;
+
+
+typedef struct {
+    const char *name;
+    const char *source;
+    vm_op_t *op;
+} def_t;
+
+typedef struct {
+    vm_op_t *pattern;
+    def_t *definitions;
+    size_t size, capacity;
+} grammar_t;
+
+#endif
-- 
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