Initial prototype of framer: a tool to build the frame for extension modules.

Tools/framer/framer/structparse.py

@@ -0,0 +1,46 @@
+"""Rudimentary parser for C struct definitions."""
+
+import re
+
+PyObject_HEAD = "PyObject_HEAD"
+PyObject_VAR_HEAD = "PyObject_VAR_HEAD"
+
+rx_name = re.compile("} (\w+);")
+
+class Struct:
+    def __init__(self, name, head, members):
+        self.name = name
+        self.head = head
+        self.members = members
+
+def parse(s):
+    """Parse a C struct definition.
+
+    The parser is very restricted in what it will accept.
+    """
+
+    lines = filter(None, s.split("\n")) # get non-empty lines
+    assert lines[0].strip() == "typedef struct {"
+    pyhead = lines[1].strip()
+    assert (pyhead.startswith("PyObject") and
+            pyhead.endswith("HEAD"))
+    members = []
+    for line in lines[2:]:
+        line = line.strip()
+        if line.startswith("}"):
+            break
+        
+        assert line.endswith(";")
+        line = line[:-1]
+        words = line.split()
+        name = words[-1]
+        type = " ".join(words[:-1])
+        if name[0] == "*":
+            name = name[1:]
+            type += " *"
+        members.append((name, type))
+    name = None
+    mo = rx_name.search(line)
+    assert mo is not None
+    name = mo.group(1)
+    return Struct(name, pyhead, members)