From a7da9795a5c7f03304031cd004657335d3dc2384 Mon Sep 17 00:00:00 2001
From: Miika Alonen <amiika@gmail.com>
Date: Thu, 16 Feb 2023 22:58:54 +0200
Subject: [PATCH] Added string replacement function for future use

---
 .gitignore                  |  2 +-
 examples/music21_example.py | 15 ++++++++++++++
 pyproject.toml              |  3 +++
 test.py                     | 10 ----------
 ziffers/common.py           | 39 +++++++++++++++++++++++++++++++++++--
 5 files changed, 56 insertions(+), 13 deletions(-)
 create mode 100644 examples/music21_example.py
 delete mode 100644 test.py

diff --git a/.gitignore b/.gitignore
index 9a7f66e..7e7e060 100644
--- a/.gitignore
+++ b/.gitignore
@@ -166,6 +166,6 @@ cython_debug/
 .vscode
 
 # Debugging files
-debug.py
+debug*.py
 test.py
 
diff --git a/examples/music21_example.py b/examples/music21_example.py
new file mode 100644
index 0000000..a4a8f61
--- /dev/null
+++ b/examples/music21_example.py
@@ -0,0 +1,15 @@
+from music21 import *
+from sardine import *
+from ziffers import *
+
+
+s = to_music21('i v vi vii^dim',time="4/4")
+
+s.show()
+s.show('midi')
+
+parsed = zparse('1 2 qr e 124')
+s2 = to_music21(parsed,time="4/4")
+
+s2.show()
+s2.show('midi')
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index f70b3f8..9a8949c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,9 @@ homepage = "https://github.com/Bubobubobubobubo/ziffers-python"
 documentation = "https://github.com/Bubobubobubobubo/ziffers-python"
 repository = "https://github.com/Bubobubobubobubo/ziffers-python"
 
+[tool.setuptools]
+py-modules = ['ziffers']
+
 [tool.black]
 target_version = ['py311']
 include = '\.pyi?$'
diff --git a/test.py b/test.py
deleted file mode 100644
index 044f699..0000000
--- a/test.py
+++ /dev/null
@@ -1,10 +0,0 @@
-from music21 import *
-from sardine import *
-from ziffers import *
-
-a = zparse('1 2 qr 124')
-print(list(a))
-s = to_music21('1 2 qr 124',octave=-2,time="3/4")
-
-s.show()
-s.show('midi')
diff --git a/ziffers/common.py b/ziffers/common.py
index 147592b..93bc955 100644
--- a/ziffers/common.py
+++ b/ziffers/common.py
@@ -1,9 +1,13 @@
 """ Common methods used in parsing """
+import re
+
+
 def flatten(arr: list) -> list:
     """Flattens array"""
     return (
         flatten(arr[0]) + (flatten(arr[1:]) if len(arr) > 1 else [])
-        if isinstance(arr, list) else [arr]
+        if isinstance(arr, list)
+        else [arr]
     )
 
 
@@ -17,4 +21,35 @@ def sum_dict(arr: list[dict]) -> dict:
             else:
                 result[key] = element[key]
     return result
-    
\ No newline at end of file
+
+
+def string_rewrite(axiom: str, rules: dict):
+    """String rewrite / Lindemeyer system for rule based text manipulation
+
+    Args:
+        axiom (str): Input string
+        rules (dict): String manipulation rules in dict:
+
+    Example:
+        rules = {
+            "1": "2",
+            "[2-9]": "45",
+            "4": lambda: str(randint(1, 7)),
+            "([1-9])(5)": lambda a, b: str(int(a)*int(b))
+        }
+
+        for i range(10):
+            print(string_rewrite("1", rules))
+    """
+
+    def _apply_rules(match):
+        for key, value in rules.items():
+            if re.match(key, match.group(0)):
+                if callable(value):
+                    yield value(
+                        *match.groups()
+                    ) if value.__code__.co_argcount > 0 else value()
+                yield value
+
+    pattern = re.compile("|".join(rules.keys()))
+    return pattern.sub(lambda m: next(_apply_rules(m)), axiom)