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Here's a patch which roughly implements the proposed attribute
doc-string syntax and semantics:
class C:
" class C doc-string "
a = 1
" attribute C.a doc-string "
b = 2
" attribute C.b doc-string "
The compiler would handle these cases as follows:
" class C doc-string " -> C.__doc__
" attribute C.a doc-string " -> C.__doc__a__
" attribute C.b doc-string " -> C.__doc__b__
The name mangling assures that attribute doc-strings
a) participate in class inheritence and
b) are treated as special attributes (following the __xxx__
convention)
Also, the look&feel of this convention is similar to that
of the other existing conventions: the doc string follows
the definition of the object.
The patch is a little rough in the sense that binding the
doc-string to the attribute name is done using a helper
variable that is not reset by non-expressions during the
compile. Shouldn't be too hard to fix though... at least
not for one of you compiler wizards ;-)
What do you think ?
[I will probably have to write a PEP for this...]
--
Marc-Andre Lemburg
______________________________________________________________________
Business: http://www.lemburg.com/
Python Pages: http://www.lemburg.com/python/
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--- CVS-Python/Python/compile.c Tue Aug 22 10:31:06 2000
+++ Python+Unicode/Python/compile.c Tue Aug 22 19:59:30 2000
@@ -293,10 +293,11 @@ struct compiling {
int c_last_addr, c_last_line, c_lnotab_next;
#ifdef PRIVATE_NAME_MANGLING
char *c_private; /* for private name mangling */
#endif
int c_tmpname; /* temporary local name counter */
+ char *c_last_name; /* last assigned name */
};
/* Error message including line number */
@@ -435,12 +436,13 @@ com_init(struct compiling *c, char *file
c->c_stacklevel = 0;
c->c_maxstacklevel = 0;
c->c_firstlineno = 0;
c->c_last_addr = 0;
c->c_last_line = 0;
- c-> c_lnotab_next = 0;
+ c->c_lnotab_next = 0;
c->c_tmpname = 0;
+ c->c_last_name = 0;
return 1;
fail:
com_free(c);
return 0;
@@ -1866,10 +1868,11 @@ com_assign_name(struct compiling *c, nod
{
REQ(n, NAME);
com_addopname(c, assigning ? STORE_NAME : DELETE_NAME, n);
if (assigning)
com_pop(c, 1);
+ c->c_last_name = STR(n);
}
static void
com_assign(struct compiling *c, node *n, int assigning)
{
@@ -1974,18 +1977,40 @@ com_assign(struct compiling *c, node *n,
}
}
}
/* Forward */ static node *get_rawdocstring(node *);
+/* Forward */ static PyObject *get_docstring(node *);
static void
com_expr_stmt(struct compiling *c, node *n)
{
REQ(n, expr_stmt); /* testlist ('=' testlist)* */
- /* Forget it if we have just a doc string here */
- if (!c->c_interactive && NCH(n) == 1 && get_rawdocstring(n) != NULL)
+ /* Handle attribute doc-strings here */
+ if (!c->c_interactive && NCH(n) == 1) {
+ node *docnode = get_rawdocstring(n);
+ if (docnode != NULL) {
+ if (c->c_last_name) {
+ PyObject *doc = get_docstring(docnode);
+ int i = com_addconst(c, doc);
+ char docname[420];
+#if 0
+ printf("found doc-string '%s' for '%s'\n",
+ PyString_AsString(doc),
+ c->c_last_name);
+#endif
+ sprintf(docname, "__doc__%.400s__", c->c_last_name);
+ com_addoparg(c, LOAD_CONST, i);
+ com_push(c, 1);
+ com_addopnamestr(c, STORE_NAME, docname);
+ com_pop(c, 1);
+ c->c_last_name = NULL;
+ Py_DECREF(doc);
+ }
return;
+ }
+ }
com_node(c, CHILD(n, NCH(n)-1));
if (NCH(n) == 1) {
if (c->c_interactive)
com_addbyte(c, PRINT_EXPR);
else
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