From e47d578a9cc92cbaf5291ee87d4e2a9da2d76fef Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 8 Aug 2009 15:29:45 +0200
Subject: [PATCH] Initial experimental version of the meta-file module.

---
 t/moe/__init__.py |   1 +
 t/moe/config.py   |  13 ++++++
 t/moe/meta.py     | 100 ++++++++++++++++++++++++++++++++++++++++++++++
 t/test.py         |  10 +++++
 4 files changed, 124 insertions(+)
 create mode 100644 t/moe/__init__.py
 create mode 100644 t/moe/config.py
 create mode 100644 t/moe/meta.py
 create mode 100755 t/test.py

diff --git a/t/moe/__init__.py b/t/moe/__init__.py
new file mode 100644
index 0000000..02cc0ce
--- /dev/null
+++ b/t/moe/__init__.py
@@ -0,0 +1 @@
+# No initialization needed
diff --git a/t/moe/config.py b/t/moe/config.py
new file mode 100644
index 0000000..3075d80
--- /dev/null
+++ b/t/moe/config.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+
+class MoeConfig:
+    """Moe configuration file."""
+
+    def __init__(self):
+        cfg = { 'XYZZY' : 'brum' }
+
+class MoeConfigStack:
+    """Stack of configuration files."""
+
+    def __init__(self):
+        stk = []
diff --git a/t/moe/meta.py b/t/moe/meta.py
new file mode 100644
index 0000000..f565904
--- /dev/null
+++ b/t/moe/meta.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+
+import sys
+import types
+import re
+
+key_pattern = re.compile('^[A-Za-z0-9_-]+$')
+
+class MoeMetaInvalid(Exception):
+    pass
+
+class MoeMeta:
+    """Moe meta-file."""
+
+    def __init__(self):
+        self.meta = {}
+
+    def __getitem__(self, k):
+	if not self.meta.has_key(k): return None
+        v = self.meta[k]
+	if type(v) == types.ListType:
+	    if len(v) > 0: return v[0]
+	    else: return None
+	else: return v
+
+    def __setitem__(self, k, v):
+	self.meta[k] = v
+
+    def get_list(self, k):
+	m = self.meta
+	if not m.has_key(k):
+	    m[k] = []
+	elif type(m[k]) != types.ListType:
+	    m[k] = [m[k]]
+	return m[k]
+
+    def write(self, file=None, name=None):
+	if file is None:
+	    if name is not None:
+	        file = open(name, 'w')
+	    else:
+		file = sys.stdout
+	self.write_nested(file, 0)
+
+    def write_nested(self, file, indent):
+        for k,v in self.meta.items():
+	    if type(v) == types.ListType: vals = v
+	    else: vals = [v]
+	    for w in vals:
+		if isinstance(w, MoeMeta):
+		    file.write("\t" * indent + k + "(\n")
+		    w.write_nested(file, indent+1);
+		    file.write("\t" * indent + ")\n")
+		else:
+        	    file.write("\t" * indent + k + ':' + str(w) + "\n")
+
+    def read(self, file=None, name=None):
+	if file is None:
+	    if name is not None:
+		file = open(name, 'r')
+	    else:
+		file = sys.stdin
+	self.meta = {}
+	self.do_read(file)
+
+    def read_val(self, k, v):
+	if not key_pattern.match(k):
+	    raise MoeMetaInvalid, "Parse error: invalid key syntax"
+	m = self.meta
+	if not m.has_key(k):
+	    m[k] = v
+	else:
+	    self.get_list(k).append(v)
+
+    def do_read(self, file):
+	stk = []
+	this = self
+	for x in file.readlines():
+	    x = x.rstrip("\n").lstrip(" \t")
+	    if x=='' or x.startswith('#'):
+		pass
+	    else:
+		sep = x.find(':')
+		if sep >= 0:
+		    k = x[:sep]
+		    v = x[sep+1:]
+		    this.read_val(k, v)
+		elif x.endswith('('):
+		    k = x[:-1]
+		    new = MoeMeta()
+		    this.read_val(k, new)
+		    stk.append(this)
+		    this = new
+		elif x == ')':
+		    if len(stk) == 0:
+			raise MoeMetaInvalid, "Parse error: incorrect nesting"
+		    else:
+			this = stk.pop()
+		else:
+		    raise MoeMetaInvalid, "Parse error: malformed line"
diff --git a/t/test.py b/t/test.py
new file mode 100755
index 0000000..e928214
--- /dev/null
+++ b/t/test.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+import sys
+sys.path.append('.')
+
+import moe.meta
+
+m = moe.meta.MoeMeta()
+m['a'] = '1'
+m.write()
-- 
2.39.2