Add core:text/regex

core/text/regex/parser/debugging.odin

@@ -0,0 +1,103 @@
+package regex_parser
+
+import "core:io"
+
+write_node :: proc(w: io.Writer, node: Node) {
+	switch specific in node {
+	case ^Node_Rune:
+		io.write_rune(w, specific.data)
+
+	case ^Node_Rune_Class:
+		io.write_byte(w, '[')
+		if specific.negating {
+			io.write_byte(w, '^')
+		}
+		for r in specific.data.runes {
+			io.write_rune(w, r)
+		}
+		for range in specific.data.ranges {
+			io.write_rune(w, range.lower)
+			io.write_byte(w, '-')
+			io.write_rune(w, range.upper)
+		}
+		io.write_byte(w, ']')
+
+	case ^Node_Wildcard:
+		io.write_byte(w, '.')
+
+	case ^Node_Concatenation:
+		io.write_rune(w, '「')
+		for subnode, i in specific.nodes {
+			if i != 0 {
+				io.write_rune(w, '⋅')
+			}
+			write_node(w, subnode)
+		}
+		io.write_rune(w, '」')
+
+	case ^Node_Repeat_Zero:
+		write_node(w, specific.inner)
+		io.write_byte(w, '*')
+	case ^Node_Repeat_Zero_Non_Greedy:
+		write_node(w, specific.inner)
+		io.write_string(w, "*?")
+	case ^Node_Repeat_One:
+		write_node(w, specific.inner)
+		io.write_byte(w, '+')
+	case ^Node_Repeat_One_Non_Greedy:
+		write_node(w, specific.inner)
+		io.write_string(w, "+?")
+
+	case ^Node_Repeat_N:
+		write_node(w, specific.inner)
+		if specific.lower == 0 && specific.upper == -1 {
+			io.write_byte(w, '*')
+		} else if specific.lower == 1 && specific.upper == -1 {
+			io.write_byte(w, '+')
+		} else {
+			io.write_byte(w, '{')
+			io.write_int(w, specific.lower)
+			io.write_byte(w, ',')
+			io.write_int(w, specific.upper)
+			io.write_byte(w, '}')
+		}
+
+	case ^Node_Alternation:
+		io.write_rune(w, '《')
+		write_node(w, specific.left)
+		io.write_byte(w, '|')
+		write_node(w, specific.right)
+		io.write_rune(w, '》')
+
+	case ^Node_Optional:
+		io.write_rune(w, '〈')
+		write_node(w, specific.inner)
+		io.write_byte(w, '?')
+		io.write_rune(w, '〉')
+	case ^Node_Optional_Non_Greedy:
+		io.write_rune(w, '〈')
+		write_node(w, specific.inner)
+		io.write_string(w, "??")
+		io.write_rune(w, '〉')
+
+	case ^Node_Group:
+		io.write_byte(w, '(')
+		if !specific.capture {
+			io.write_string(w, "?:")
+		}
+		write_node(w, specific.inner)
+		io.write_byte(w, ')')
+
+	case ^Node_Anchor:
+		io.write_byte(w, '^' if specific.start else '$')
+
+	case ^Node_Word_Boundary:
+		io.write_string(w, `\B` if specific.non_word else `\b`)
+
+	case ^Node_Match_All_And_Escape:
+		io.write_string(w, "《.*$》")
+
+	case nil:
+		io.write_string(w, "<nil>")
+	}
+}