Hi Sebastian,
I added support for labelled statements to treegenerator/treecompiler
(ECMAScript grammar [http://www.mozilla.org/js/language/E262-3.pdf],
section 12.12).
We can now write something like:
outer: while(...)
{
inner: while(...)
{
if (...)
break outer; // exit outer "while"
}
}
I attach two diff's for you to apply to svn, if you
like them.
Cheers,
Alessandro
--- treegenerator.orig.py 2006-09-26 23:00:54.000000000 +0200
+++ treegenerator.py 2006-09-29 23:05:00.000000000 +0200
@@ -317,15 +317,27 @@
elif not expressionMode and stream.currIsType("protected", "BREAK"):
item = createItemNode("break", stream)
stream.next()
+ # NOTE: The label after the break keyword is optional
+ if not stream.hadEolBefore() and stream.currIsType("name"):
+ item.set("label", stream.currSource())
+ stream.next()
elif not expressionMode and stream.currIsType("protected", "CONTINUE"):
item = createItemNode("continue", stream)
stream.next()
+ # NOTE: The label after the continue keyword is optional
+ if not stream.hadEolBefore() and stream.currIsType("name"):
+ item.set("label", stream.currSource())
+ stream.next()
if not item:
if stream.currIsType("token", "SEMICOLON") and not expressionMode:
# This is an empty statement
item = createItemNode("emptyStatement", stream)
stream.next()
+ elif stream.currIsType("token", "COLON"):
+ # The previous identifier was a label
+ item = createItemNode("labelTerminator", stream)
+ stream.next()
else:
if expressionMode:
expectedDesc = "expression"
--- treecompiler.orig.py 2006-09-26 23:01:12.000000000 +0200
+++ treecompiler.py 2006-09-29 23:00:04.000000000 +0200
@@ -75,9 +75,15 @@
elif node.type == "break":
compString += "break"
+ if node.get("label", False):
+ compString += " " + node.get("label", False)
+
elif node.type == "continue":
compString += "continue"
+ if node.get("label", False):
+ compString += " " + node.get("label", False)
+
elif node.type == "elseStatement":
# This was a (if)statement without a block around (a set of {})
if not node.parent.getChild("statement").hasChild("block"):
@@ -222,6 +228,9 @@
else:
print "Unknown third argument... Not a hook"
+ elif node.type == "labelTerminator":
+ compString += ":"
+
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