From cd9f3bc3f3ecb04eaee42c65880711bd35c7e71b Mon Sep 17 00:00:00 2001
From: Matthew Hall <hallmatthew314@gmail.com>
Date: Sat, 3 Sep 2022 16:07:58 +1200
Subject: Able to parse Thue code

---
 src/thue/rule.cr | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 src/thue/rule.cr

(limited to 'src/thue/rule.cr')

diff --git a/src/thue/rule.cr b/src/thue/rule.cr
new file mode 100644
index 0000000..34c2396
--- /dev/null
+++ b/src/thue/rule.cr
@@ -0,0 +1,43 @@
+require "./thue.cr"
+
+abstract struct Thue::Rule
+  @pattern : Regex
+
+  def initialize(pattern : String)
+    @pattern = Regex.new(pattern)
+  end
+
+  def matches?(str : String) : Bool
+    str.matches?(@pattern)
+  end
+
+  abstract def replacement : String
+end
+
+struct Thue::NormalRule < Thue::Rule
+  def initialize(pattern : String, @replacement : String)
+    super(pattern)
+  end
+
+  def replacement : String
+    @replacement
+  end
+end
+
+struct Thue::InputRule < Thue::Rule
+  def replacement : String
+    gets
+  end
+end
+
+struct Thue::OutputRule < Thue::Rule
+  def initialize(pattern : String, @output : String)
+    super(pattern)
+  end
+
+  def replacement : String
+    print @output
+    return ""
+  end
+end
+
-- 
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