mirror of https://github.com/python/cpython.git
Revise implementations of getChildren() and getChildNodes().
Add support for floor division (// and //=) The implementation of getChildren() and getChildNodes() is intended to be faster, because it avoids calling flatten() on every return value. But it's not clear that it is a lot faster, because constructing a tuple with just the right values ends up being slow. (Too many attribute lookups probably.) The ast.txt file is much more complicated, with funny characters at the ends of names (*, &, !) to indicate the types of each child node. The astgen script is also much more complex, making me wonder if it's still useful.
This commit is contained in:
Jeremy Hylton
parent
96d68d57be
commit
5477f529d6
File diff suppressed because it is too large
Load Diff
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@ -1,56 +1,64 @@
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Module: doc, node
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Stmt: nodes
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Function: name, argnames, defaults, flags, doc, code
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Lambda: argnames, defaults, flags, code
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Class: name, bases, doc, code
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# This file describes the nodes of the AST in ast.py. The module is
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# generated by astgen.py.
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# The descriptions use the following special notation to describe
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# properties of the children:
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# * this child is not a node
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# ! this child is a sequence that contains nodes in it
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# & this child may be set to None
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# = ... a default value for the node constructor (optional args)
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Module: doc*, node
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Stmt: nodes!
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Function: name*, argnames*, defaults!, flags*, doc*, code
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Lambda: argnames*, defaults!, flags*, code
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Class: name*, bases!, doc*, code
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Pass:
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Break:
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Continue:
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For: assign, list, body, else_
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While: test, body, else_
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If: tests, else_
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Exec: expr, locals, globals
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From: modname, names
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Import: names
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Raise: expr1, expr2, expr3
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For: assign, list, body, else_&
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While: test, body, else_&
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If: tests!, else_&
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Exec: expr, locals&, globals&
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From: modname*, names*
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Import: names*
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Raise: expr1&, expr2&, expr3&
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TryFinally: body, final
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TryExcept: body, handlers, else_
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TryExcept: body, handlers!, else_&
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Return: value
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Yield: value
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Const: value
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Print: nodes, dest
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Printnl: nodes, dest
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Const: value*
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Print: nodes!, dest&
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Printnl: nodes!, dest&
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Discard: expr
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AugAssign: node, op, expr
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Assign: nodes, expr
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AssTuple: nodes
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AssList: nodes
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AssName: name, flags
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AssAttr: expr, attrname, flags
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ListComp: expr, quals
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ListCompFor: assign, list, ifs
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AugAssign: node, op*, expr
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Assign: nodes!, expr
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AssTuple: nodes!
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AssList: nodes!
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AssName: name*, flags*
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AssAttr: expr, attrname*, flags*
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ListComp: expr, quals!
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ListCompFor: assign, list, ifs!
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ListCompIf: test
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List: nodes
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Dict: items
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List: nodes!
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Dict: items!
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Not: expr
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Compare: expr, ops
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Name: name
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Compare: expr, ops!
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Name: name*
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Global: names
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Backquote: expr
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Getattr: expr, attrname
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CallFunc: node, args, star_args = None, dstar_args = None
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Keyword: name, expr
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Subscript: expr, flags, subs
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Getattr: expr, attrname*
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CallFunc: node, args!, star_args& = None, dstar_args& = None
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Keyword: name*, expr
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Subscript: expr, flags*, subs!
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Ellipsis:
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Sliceobj: nodes
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Slice: expr, flags, lower, upper
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Assert: test, fail
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Tuple: nodes
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Or: nodes
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And: nodes
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Bitor: nodes
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Bitxor: nodes
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Bitand: nodes
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Sliceobj: nodes!
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Slice: expr, flags*, lower&, upper&
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Assert: test, fail&
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Tuple: nodes!
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Or: nodes!
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And: nodes!
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Bitor: nodes!
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Bitxor: nodes!
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Bitand: nodes!
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LeftShift: (left, right)
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RightShift: (left, right)
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Add: (left, right)
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@ -59,6 +67,7 @@ Mul: (left, right)
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Div: (left, right)
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Mod: (left, right)
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Power: (left, right)
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FloorDiv: (left, right)
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UnaryAdd: expr
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UnarySub: expr
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Invert: expr
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@ -1,4 +1,11 @@
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"""Generate ast module from specification"""
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"""Generate ast module from specification
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This script generates the ast module from a simple specification,
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which makes it easy to accomodate changes in the grammar. This
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approach would be quite reasonable if the grammar changed often.
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Instead, it is rather complex to generate the appropriate code. And
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the Node interface has changed more often than the grammar.
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"""
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import fileinput
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import getopt
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@ -24,7 +31,13 @@ def strip_default(arg):
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i = arg.find('=')
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if i == -1:
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return arg
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return arg[:i].strip()
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t = arg[:i].strip()
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return t
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P_NODE = 1
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P_OTHER = 2
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P_NESTED = 3
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P_NONE = 4
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class NodeInfo:
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"""Each instance describes a specific AST node"""
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@ -32,9 +45,8 @@ def __init__(self, name, args):
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self.name = name
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self.args = args.strip()
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self.argnames = self.get_argnames()
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self.argprops = self.get_argprops()
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self.nargs = len(self.argnames)
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self.children = COMMA.join(["self.%s" % c
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for c in self.argnames])
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self.init = []
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def get_argnames(self):
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@ -47,12 +59,48 @@ def get_argnames(self):
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return [strip_default(arg.strip())
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for arg in args.split(',') if arg]
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def get_argprops(self):
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"""Each argument can have a property like '*' or '!'
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XXX This method modifies the argnames in place!
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"""
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d = {}
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hardest_arg = P_NODE
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for i in range(len(self.argnames)):
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arg = self.argnames[i]
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if arg.endswith('*'):
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arg = self.argnames[i] = arg[:-1]
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d[arg] = P_OTHER
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hardest_arg = P_OTHER
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elif arg.endswith('!'):
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arg = self.argnames[i] = arg[:-1]
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d[arg] = P_NESTED
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hardest_arg = P_NESTED
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elif arg.endswith('&'):
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arg = self.argnames[i] = arg[:-1]
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d[arg] = P_NONE
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hardest_arg = P_NONE
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else:
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d[arg] = P_NODE
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self.hardest_arg = hardest_arg
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if hardest_arg > P_NODE:
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self.args = self.args.replace('*', '')
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self.args = self.args.replace('!', '')
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self.args = self.args.replace('&', '')
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return d
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def gen_source(self):
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buf = StringIO()
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print >> buf, "class %s(Node):" % self.name
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print >> buf, ' nodes["%s"] = "%s"' % (self.name.lower(), self.name)
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self._gen_init(buf)
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print >> buf
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self._gen_getChildren(buf)
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print >> buf
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self._gen_getChildNodes(buf)
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print >> buf
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self._gen_repr(buf)
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buf.seek(0, 0)
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return buf.read()
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@ -68,14 +116,57 @@ def _gen_init(self, buf):
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print >> buf, "".join([" " + line for line in self.init])
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def _gen_getChildren(self, buf):
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print >> buf, " def _getChildren(self):"
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if self.argnames:
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if self.nargs == 1:
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print >> buf, " return %s," % self.children
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else:
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print >> buf, " return %s" % self.children
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else:
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print >> buf, " def getChildren(self):"
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if len(self.argnames) == 0:
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print >> buf, " return ()"
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else:
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if self.hardest_arg < P_NESTED:
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clist = COMMA.join(["self.%s" % c
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for c in self.argnames])
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if self.nargs == 1:
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print >> buf, " return %s," % clist
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else:
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print >> buf, " return %s" % clist
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else:
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print >> buf, " children = []"
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template = " children.%s(%sself.%s%s)"
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for name in self.argnames:
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if self.argprops[name] == P_NESTED:
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print >> buf, template % ("extend", "flatten(",
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name, ")")
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else:
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print >> buf, template % ("append", "", name, "")
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print >> buf, " return tuple(children)"
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def _gen_getChildNodes(self, buf):
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print >> buf, " def getChildNodes(self):"
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if len(self.argnames) == 0:
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print >> buf, " return ()"
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else:
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if self.hardest_arg < P_NESTED:
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clist = ["self.%s" % c
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for c in self.argnames
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if self.argprops[c] == P_NODE]
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if len(clist) == 0:
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print >> buf, " return ()"
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elif len(clist) == 1:
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print >> buf, " return %s," % clist[0]
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else:
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print >> buf, " return %s" % COMMA.join(clist)
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else:
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print >> buf, " nodes = []"
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template = " nodes.%s(%sself.%s%s)"
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for name in self.argnames:
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if self.argprops[name] == P_NONE:
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tmp = (" if self.%s is not None:"
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" nodes.append(self.%s)")
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print >> buf, tmp % (name, name)
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elif self.argprops[name] == P_NESTED:
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print >> buf, template % ("extend", "flatten_nodes(",
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name, ")")
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elif self.argprops[name] == P_NODE:
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print >> buf, template % ("append", "", name, "")
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print >> buf, " return tuple(nodes)"
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def _gen_repr(self, buf):
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print >> buf, " def __repr__(self):"
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@ -98,6 +189,8 @@ def parse_spec(file):
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classes = {}
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cur = None
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for line in fileinput.input(file):
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if line.strip().startswith('#'):
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continue
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mo = rx_init.search(line)
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if mo is None:
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if cur is None:
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@ -149,6 +242,9 @@ def flatten(list):
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l.append(elt)
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return l
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def flatten_nodes(list):
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return [n for n in flatten(list) if isinstance(n, Node)]
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def asList(nodes):
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l = []
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for item in nodes:
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@ -164,21 +260,19 @@ def asList(nodes):
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nodes = {}
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class Node:
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lineno = None
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class Node: # an abstract base class
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lineno = None # provide a lineno for nodes that don't have one
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def getType(self):
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pass
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pass # implemented by subclass
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def getChildren(self):
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# XXX It would be better to generate flat values to begin with
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return flatten(self._getChildren())
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pass # implemented by subclasses
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def asList(self):
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return tuple(asList(self.getChildren()))
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def getChildNodes(self):
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return [n for n in self.getChildren() if isinstance(n, Node)]
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pass # implemented by subclasses
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class EmptyNode(Node):
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def __init__(self):
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self.lineno = None
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pass
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### EPILOGUE
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klasses = globals()
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File diff suppressed because it is too large
Load Diff
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@ -1,56 +1,64 @@
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Module: doc, node
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Stmt: nodes
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Function: name, argnames, defaults, flags, doc, code
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Lambda: argnames, defaults, flags, code
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Class: name, bases, doc, code
|
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# This file describes the nodes of the AST in ast.py. The module is
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# generated by astgen.py.
|
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# The descriptions use the following special notation to describe
|
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# properties of the children:
|
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# * this child is not a node
|
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# ! this child is a sequence that contains nodes in it
|
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# & this child may be set to None
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# = ... a default value for the node constructor (optional args)
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Module: doc*, node
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Stmt: nodes!
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Function: name*, argnames*, defaults!, flags*, doc*, code
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Lambda: argnames*, defaults!, flags*, code
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Class: name*, bases!, doc*, code
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Pass:
|
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Break:
|
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Continue:
|
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For: assign, list, body, else_
|
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While: test, body, else_
|
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If: tests, else_
|
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Exec: expr, locals, globals
|
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From: modname, names
|
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Import: names
|
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Raise: expr1, expr2, expr3
|
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For: assign, list, body, else_&
|
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While: test, body, else_&
|
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If: tests!, else_&
|
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Exec: expr, locals&, globals&
|
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From: modname*, names*
|
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Import: names*
|
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Raise: expr1&, expr2&, expr3&
|
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TryFinally: body, final
|
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TryExcept: body, handlers, else_
|
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TryExcept: body, handlers!, else_&
|
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Return: value
|
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Yield: value
|
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Const: value
|
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Print: nodes, dest
|
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Printnl: nodes, dest
|
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Const: value*
|
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Print: nodes!, dest&
|
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Printnl: nodes!, dest&
|
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Discard: expr
|
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AugAssign: node, op, expr
|
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Assign: nodes, expr
|
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AssTuple: nodes
|
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AssList: nodes
|
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AssName: name, flags
|
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AssAttr: expr, attrname, flags
|
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ListComp: expr, quals
|
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ListCompFor: assign, list, ifs
|
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AugAssign: node, op*, expr
|
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Assign: nodes!, expr
|
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AssTuple: nodes!
|
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AssList: nodes!
|
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AssName: name*, flags*
|
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AssAttr: expr, attrname*, flags*
|
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ListComp: expr, quals!
|
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ListCompFor: assign, list, ifs!
|
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ListCompIf: test
|
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List: nodes
|
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Dict: items
|
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List: nodes!
|
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Dict: items!
|
||||
Not: expr
|
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Compare: expr, ops
|
||||
Name: name
|
||||
Compare: expr, ops!
|
||||
Name: name*
|
||||
Global: names
|
||||
Backquote: expr
|
||||
Getattr: expr, attrname
|
||||
CallFunc: node, args, star_args = None, dstar_args = None
|
||||
Keyword: name, expr
|
||||
Subscript: expr, flags, subs
|
||||
Getattr: expr, attrname*
|
||||
CallFunc: node, args!, star_args& = None, dstar_args& = None
|
||||
Keyword: name*, expr
|
||||
Subscript: expr, flags*, subs!
|
||||
Ellipsis:
|
||||
Sliceobj: nodes
|
||||
Slice: expr, flags, lower, upper
|
||||
Assert: test, fail
|
||||
Tuple: nodes
|
||||
Or: nodes
|
||||
And: nodes
|
||||
Bitor: nodes
|
||||
Bitxor: nodes
|
||||
Bitand: nodes
|
||||
Sliceobj: nodes!
|
||||
Slice: expr, flags*, lower&, upper&
|
||||
Assert: test, fail&
|
||||
Tuple: nodes!
|
||||
Or: nodes!
|
||||
And: nodes!
|
||||
Bitor: nodes!
|
||||
Bitxor: nodes!
|
||||
Bitand: nodes!
|
||||
LeftShift: (left, right)
|
||||
RightShift: (left, right)
|
||||
Add: (left, right)
|
||||
|
|
@ -59,6 +67,7 @@ Mul: (left, right)
|
|||
Div: (left, right)
|
||||
Mod: (left, right)
|
||||
Power: (left, right)
|
||||
FloorDiv: (left, right)
|
||||
UnaryAdd: expr
|
||||
UnarySub: expr
|
||||
Invert: expr
|
||||
|
|
|
|||
|
|
@ -1,4 +1,11 @@
|
|||
"""Generate ast module from specification"""
|
||||
"""Generate ast module from specification
|
||||
|
||||
This script generates the ast module from a simple specification,
|
||||
which makes it easy to accomodate changes in the grammar. This
|
||||
approach would be quite reasonable if the grammar changed often.
|
||||
Instead, it is rather complex to generate the appropriate code. And
|
||||
the Node interface has changed more often than the grammar.
|
||||
"""
|
||||
|
||||
import fileinput
|
||||
import getopt
|
||||
|
|
@ -24,7 +31,13 @@ def strip_default(arg):
|
|||
i = arg.find('=')
|
||||
if i == -1:
|
||||
return arg
|
||||
return arg[:i].strip()
|
||||
t = arg[:i].strip()
|
||||
return t
|
||||
|
||||
P_NODE = 1
|
||||
P_OTHER = 2
|
||||
P_NESTED = 3
|
||||
P_NONE = 4
|
||||
|
||||
class NodeInfo:
|
||||
"""Each instance describes a specific AST node"""
|
||||
|
|
@ -32,9 +45,8 @@ def __init__(self, name, args):
|
|||
self.name = name
|
||||
self.args = args.strip()
|
||||
self.argnames = self.get_argnames()
|
||||
self.argprops = self.get_argprops()
|
||||
self.nargs = len(self.argnames)
|
||||
self.children = COMMA.join(["self.%s" % c
|
||||
for c in self.argnames])
|
||||
self.init = []
|
||||
|
||||
def get_argnames(self):
|
||||
|
|
@ -47,12 +59,48 @@ def get_argnames(self):
|
|||
return [strip_default(arg.strip())
|
||||
for arg in args.split(',') if arg]
|
||||
|
||||
def get_argprops(self):
|
||||
"""Each argument can have a property like '*' or '!'
|
||||
|
||||
XXX This method modifies the argnames in place!
|
||||
"""
|
||||
d = {}
|
||||
hardest_arg = P_NODE
|
||||
for i in range(len(self.argnames)):
|
||||
arg = self.argnames[i]
|
||||
if arg.endswith('*'):
|
||||
arg = self.argnames[i] = arg[:-1]
|
||||
d[arg] = P_OTHER
|
||||
hardest_arg = P_OTHER
|
||||
elif arg.endswith('!'):
|
||||
arg = self.argnames[i] = arg[:-1]
|
||||
d[arg] = P_NESTED
|
||||
hardest_arg = P_NESTED
|
||||
elif arg.endswith('&'):
|
||||
arg = self.argnames[i] = arg[:-1]
|
||||
d[arg] = P_NONE
|
||||
hardest_arg = P_NONE
|
||||
else:
|
||||
d[arg] = P_NODE
|
||||
self.hardest_arg = hardest_arg
|
||||
|
||||
if hardest_arg > P_NODE:
|
||||
self.args = self.args.replace('*', '')
|
||||
self.args = self.args.replace('!', '')
|
||||
self.args = self.args.replace('&', '')
|
||||
|
||||
return d
|
||||
|
||||
def gen_source(self):
|
||||
buf = StringIO()
|
||||
print >> buf, "class %s(Node):" % self.name
|
||||
print >> buf, ' nodes["%s"] = "%s"' % (self.name.lower(), self.name)
|
||||
self._gen_init(buf)
|
||||
print >> buf
|
||||
self._gen_getChildren(buf)
|
||||
print >> buf
|
||||
self._gen_getChildNodes(buf)
|
||||
print >> buf
|
||||
self._gen_repr(buf)
|
||||
buf.seek(0, 0)
|
||||
return buf.read()
|
||||
|
|
@ -68,14 +116,57 @@ def _gen_init(self, buf):
|
|||
print >> buf, "".join([" " + line for line in self.init])
|
||||
|
||||
def _gen_getChildren(self, buf):
|
||||
print >> buf, " def _getChildren(self):"
|
||||
if self.argnames:
|
||||
if self.nargs == 1:
|
||||
print >> buf, " return %s," % self.children
|
||||
else:
|
||||
print >> buf, " return %s" % self.children
|
||||
else:
|
||||
print >> buf, " def getChildren(self):"
|
||||
if len(self.argnames) == 0:
|
||||
print >> buf, " return ()"
|
||||
else:
|
||||
if self.hardest_arg < P_NESTED:
|
||||
clist = COMMA.join(["self.%s" % c
|
||||
for c in self.argnames])
|
||||
if self.nargs == 1:
|
||||
print >> buf, " return %s," % clist
|
||||
else:
|
||||
print >> buf, " return %s" % clist
|
||||
else:
|
||||
print >> buf, " children = []"
|
||||
template = " children.%s(%sself.%s%s)"
|
||||
for name in self.argnames:
|
||||
if self.argprops[name] == P_NESTED:
|
||||
print >> buf, template % ("extend", "flatten(",
|
||||
name, ")")
|
||||
else:
|
||||
print >> buf, template % ("append", "", name, "")
|
||||
print >> buf, " return tuple(children)"
|
||||
|
||||
def _gen_getChildNodes(self, buf):
|
||||
print >> buf, " def getChildNodes(self):"
|
||||
if len(self.argnames) == 0:
|
||||
print >> buf, " return ()"
|
||||
else:
|
||||
if self.hardest_arg < P_NESTED:
|
||||
clist = ["self.%s" % c
|
||||
for c in self.argnames
|
||||
if self.argprops[c] == P_NODE]
|
||||
if len(clist) == 0:
|
||||
print >> buf, " return ()"
|
||||
elif len(clist) == 1:
|
||||
print >> buf, " return %s," % clist[0]
|
||||
else:
|
||||
print >> buf, " return %s" % COMMA.join(clist)
|
||||
else:
|
||||
print >> buf, " nodes = []"
|
||||
template = " nodes.%s(%sself.%s%s)"
|
||||
for name in self.argnames:
|
||||
if self.argprops[name] == P_NONE:
|
||||
tmp = (" if self.%s is not None:"
|
||||
" nodes.append(self.%s)")
|
||||
print >> buf, tmp % (name, name)
|
||||
elif self.argprops[name] == P_NESTED:
|
||||
print >> buf, template % ("extend", "flatten_nodes(",
|
||||
name, ")")
|
||||
elif self.argprops[name] == P_NODE:
|
||||
print >> buf, template % ("append", "", name, "")
|
||||
print >> buf, " return tuple(nodes)"
|
||||
|
||||
def _gen_repr(self, buf):
|
||||
print >> buf, " def __repr__(self):"
|
||||
|
|
@ -98,6 +189,8 @@ def parse_spec(file):
|
|||
classes = {}
|
||||
cur = None
|
||||
for line in fileinput.input(file):
|
||||
if line.strip().startswith('#'):
|
||||
continue
|
||||
mo = rx_init.search(line)
|
||||
if mo is None:
|
||||
if cur is None:
|
||||
|
|
@ -149,6 +242,9 @@ def flatten(list):
|
|||
l.append(elt)
|
||||
return l
|
||||
|
||||
def flatten_nodes(list):
|
||||
return [n for n in flatten(list) if isinstance(n, Node)]
|
||||
|
||||
def asList(nodes):
|
||||
l = []
|
||||
for item in nodes:
|
||||
|
|
@ -164,21 +260,19 @@ def asList(nodes):
|
|||
|
||||
nodes = {}
|
||||
|
||||
class Node:
|
||||
lineno = None
|
||||
class Node: # an abstract base class
|
||||
lineno = None # provide a lineno for nodes that don't have one
|
||||
def getType(self):
|
||||
pass
|
||||
pass # implemented by subclass
|
||||
def getChildren(self):
|
||||
# XXX It would be better to generate flat values to begin with
|
||||
return flatten(self._getChildren())
|
||||
pass # implemented by subclasses
|
||||
def asList(self):
|
||||
return tuple(asList(self.getChildren()))
|
||||
def getChildNodes(self):
|
||||
return [n for n in self.getChildren() if isinstance(n, Node)]
|
||||
pass # implemented by subclasses
|
||||
|
||||
class EmptyNode(Node):
|
||||
def __init__(self):
|
||||
self.lineno = None
|
||||
pass
|
||||
|
||||
### EPILOGUE
|
||||
klasses = globals()
|
||||
|
|
|
|||
Loading…
Reference in New Issue