[Python-checkins] r53676 - in sandbox/trunk/2to3: find_pattern.py fixes/find_pattern.py

guido.van.rossum python-checkins at python.org
Thu Feb 8 23:35:32 CET 2007


Author: guido.van.rossum
Date: Thu Feb  8 23:35:31 2007
New Revision: 53676

Added:
   sandbox/trunk/2to3/find_pattern.py   (contents, props changed)
Removed:
   sandbox/trunk/2to3/fixes/find_pattern.py
Log:
Move find_pattern.py to where it belongs. [Blush.]


Added: sandbox/trunk/2to3/find_pattern.py
==============================================================================
--- (empty file)
+++ sandbox/trunk/2to3/find_pattern.py	Thu Feb  8 23:35:31 2007
@@ -0,0 +1,97 @@
+#!/usr/bin/env python2.5
+
+"""Script that makes determining PATTERN for a new fix much easier.
+
+Figuring out exactly what PATTERN I want for a given fixer class is
+getting tedious. This script will step through each possible subtree
+for a given string, allowing you to select which one you want. It will
+then try to figure out an appropriate pattern to match that tree. This
+pattern will require some editing (it will be overly restrictive) but
+should provide a solid base to work with and handle the tricky parts.
+
+Usage:
+
+    python find_pattern.py "g.throw(E, V, T)"
+
+This will step through each subtree in the parse. To reject a
+candidate subtree, hit enter; to accept a candidate, hit "y" and
+enter. The pattern will be spit out to stdout.
+
+For example, the above will yield a succession of possible snippets,
+skipping all leaf-only trees. I accept
+
+'g.throw(E, V, T)'
+
+This causes find_pattern to spit out
+
+power< 'g' trailer< '.' 'throw' >
+           trailer< '(' arglist< 'E' ',' 'V' ',' 'T' > ')' > >
+
+
+Some minor tweaks later, I'm left with
+
+power< any trailer< '.' 'throw' >
+       trailer< '(' args=arglist< exc=any ',' val=any [',' tb=any] > ')' > >
+
+which is exactly what I was after.
+
+Larger snippets can be placed in a file (as opposed to a command-line
+arg) and processed with the -f option.
+"""
+
+__author__ = "Collin Winter <collinw at gmail.com>"
+
+# Python imports
+import optparse
+import sys
+from StringIO import StringIO
+
+# Local imports
+import pytree
+from pgen2 import driver
+from pygram import python_symbols, python_grammar
+
+driver = driver.Driver(python_grammar, convert=pytree.convert)
+
+def main(args):
+    parser = optparse.OptionParser(usage="find_pattern.py [options] [string]")
+    parser.add_option("-f", "--file", action="store",
+                      help="Read a code snippet from the specified file")
+
+    # Parse command line arguments
+    options, args = parser.parse_args(args)
+    if options.file:
+        tree = driver.parse_file(options.file)
+    elif len(args) > 1:
+        tree = driver.parse_stream(StringIO(args[1] + "\n"))
+    else:
+        print >>sys.stderr, "You must specify an input file or an input string"
+        return 1
+
+    examine_tree(tree)
+    return 0
+
+def examine_tree(tree):
+    for node in tree.post_order():
+        if isinstance(node, pytree.Leaf):
+            continue
+        print repr(str(node))
+        verdict = raw_input()
+        if verdict.strip():
+            print find_pattern(node)
+            return
+
+def find_pattern(node):
+    if isinstance(node, pytree.Leaf):
+        return repr(node.value)
+
+    return find_symbol(node.type) + \
+           "< " + " ".join(find_pattern(n) for n in node.children) + " >"
+
+def find_symbol(sym):
+    for n, v in python_symbols.__dict__.items():
+        if v == sym:
+            return n
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv))

Deleted: /sandbox/trunk/2to3/fixes/find_pattern.py
==============================================================================
--- /sandbox/trunk/2to3/fixes/find_pattern.py	Thu Feb  8 23:35:31 2007
+++ (empty file)
@@ -1,98 +0,0 @@
-#!/usr/bin/env python2.5
-
-"""A script that makes determining PATTERN for a new fixer much, much easier.
-
-Figuring out exactly what PATTERN I want for a given fixer class is
-getting tedious. This script will step through each possible subtree
-for a given string, allowing you to select which one you want. It will
-then try to figure out an appropriate pattern to match that tree. This
-pattern will require some editing (it will be overly restrictive) but
-should provide a solid base to work with and handle the tricky parts.
-
-Usage:
-
-    python find_pattern.py "g.throw(E, V, T)"
-
-This will step through each subtree in the parse. To reject a
-candidate subtree, hit enter; to accept a candidate, hit "y" and
-enter. The pattern will be spit out to stdout.
-
-For example, the above will yield a succession of possible snippets,
-skipping all leaf-only trees. I accept
-
-'g.throw(E, V, T)'
-
-This causes find_pattern to spit out
-
-power< 'g' trailer< '.' 'throw' >
-           trailer< '(' arglist< 'E' ',' 'V' ',' 'T' > ')' > >
-
-
-Some minor tweaks later, I'm left with
-
-power< any trailer< '.' 'throw' >
-       trailer< '(' args=arglist< exc=any ',' val=any [',' tb=any] > ')' > >
-
-
-which is exactly what I was after.
-
-Larger snippets can be placed in a file (as opposed to a command-line
-arg) and processed with the -f option.
-"""
-
-__author__ = "Collin Winter <collinw at gmail.com>"
-
-# Python imports
-import optparse
-import sys
-from StringIO import StringIO
-
-# Local imports
-import pytree
-from pgen2 import driver
-from pygram import python_symbols, python_grammar
-
-driver = driver.Driver(python_grammar, convert=pytree.convert)
-
-def main(args):
-    parser = optparse.OptionParser(usage="find_pattern.py [options] [string]")
-    parser.add_option("-f", "--file", action="store",
-                      help="Read a code snippet from the specified file")
-
-    # Parse command line arguments
-    options, args = parser.parse_args(args)
-    if options.file:
-        tree = driver.parse_file(options.file)
-    elif len(args) > 1:
-        tree = driver.parse_stream(StringIO(args[1] + "\n"))
-    else:
-        print >>sys.stderr, "You must specify an input file or an input string"
-        return 1
-
-    examine_tree(tree)
-    return 0
-
-def examine_tree(tree):
-    for node in tree.post_order():
-        if isinstance(node, pytree.Leaf):
-            continue
-        print repr(str(node))
-        verdict = raw_input()
-        if verdict.strip():
-            print find_pattern(node)
-            return
-
-def find_pattern(node):
-    if isinstance(node, pytree.Leaf):
-        return repr(node.value)
-
-    return find_symbol(node.type) + \
-           "< " + " ".join(find_pattern(n) for n in node.children) + " >"
-
-def find_symbol(sym):
-    for n, v in python_symbols.__dict__.items():
-        if v == sym:
-            return n
-
-if __name__ == "__main__":
-    sys.exit(main(sys.argv))


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