#!/usr/bin/python
#
-# Copyright (C) 2011 Google Inc.
+# Copyright (C) 2011, 2012 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
"""
import re
+import types
+from ganeti import compat
from ganeti import constants
+from ganeti import luxi
+#: Constant name regex
CONSTANT_RE = re.compile("^[A-Z][A-Z0-9_-]+$")
+#: Private name regex
+PRIVATE_RE = re.compile("^__.+__$")
+
+#: The type of regex objects
+RE_TYPE = type(CONSTANT_RE)
+
def NameRules(name):
"""Converts the upper-cased Python name to Haskell camelCase.
return None
-def ConvertVariable(name, value):
+def IdentifyOrigin(all_items, value):
+ """Tries to identify a constant name from a constant's value.
+
+ This uses a simple algorithm: is there a constant (and only one)
+ with the same value? If so, then it returns that constants' name.
+
+ @note: it is recommended to use this only for tuples/lists/sets, and
+ not for individual (top-level) values
+ @param all_items: a dictionary of name/values for the current module
+ @param value: the value for which we try to find an origin
+
+ """
+ found = [name for (name, v) in all_items.items() if v is value]
+ if len(found) == 1:
+ return found[0]
+ else:
+ return None
+
+
+def FormatListElems(all_items, pfx_name, ovals, tvals):
+ """Formats a list's elements.
+
+ This formats the elements as either values or, if we find all
+ origins, as names.
+
+ @param all_items: a dictionary of name/values for the current module
+ @param pfx_name: the prefix name currently used
+ @param ovals: the list of actual (Python) values
+ @param tvals: the list of values we want to format in the Haskell form
+
+ """
+ origins = [IdentifyOrigin(all_items, v) for v in ovals]
+ if compat.all(x is not None for x in origins):
+ values = [NameRules(pfx_name + origin) for origin in origins]
+ else:
+ values = tvals
+ return ", ".join(values)
+
+
+def ConvertVariable(prefix, name, value, all_items):
"""Converts a given variable to Haskell code.
+ @param prefix: a prefix for the Haskell name (useful for module
+ identification)
@param name: the Python name
@param value: the value
+ @param all_items: a dictionary of name/value for the module being
+ processed
@return: a list of Haskell code lines
"""
lines = []
- hs_name = NameRules(name)
+ if prefix:
+ pfx_name = prefix + "_"
+ fqn = prefix + "." + name
+ else:
+ pfx_name = ""
+ fqn = name
+ hs_name = NameRules(pfx_name + name)
hs_typeval = HaskellTypeVal(value)
- if not CONSTANT_RE.match(name):
- lines.append("-- Skipped %s, not constant" % name)
+ if (isinstance(value, types.ModuleType) or callable(value) or
+ PRIVATE_RE.match(name)):
+ # no sense in marking these, as we don't _want_ to convert them; the
+ # message in the next if block is for datatypes we don't _know_
+ # (yet) how to convert
+ pass
+ elif not CONSTANT_RE.match(name):
+ lines.append("-- Skipped %s %s, not constant" % (fqn, type(value)))
elif hs_typeval is not None:
# this is a simple value
(hs_type, hs_val) = hs_typeval
- lines.append("-- | Converted from Python constant %s" % name)
+ lines.append("-- | Converted from Python constant %s" % fqn)
lines.append("%s :: %s" % (hs_name, hs_type))
lines.append("%s = %s" % (hs_name, hs_val))
elif isinstance(value, dict):
if value:
- lines.append("-- Following lines come from dictionary %s" % name)
+ lines.append("-- Following lines come from dictionary %s" % fqn)
for k in sorted(value.keys()):
- lines.extend(ConvertVariable(DictKeyName(name, k), value[k]))
+ lines.extend(ConvertVariable(prefix, DictKeyName(name, k),
+ value[k], all_items))
+ elif isinstance(value, tuple):
+ tvs = [HaskellTypeVal(elem) for elem in value]
+ if compat.all(e is not None for e in tvs):
+ ttypes = ", ".join(e[0] for e in tvs)
+ tvals = FormatListElems(all_items, pfx_name, value, [e[1] for e in tvs])
+ lines.append("-- | Converted from Python tuple %s" % fqn)
+ lines.append("%s :: (%s)" % (hs_name, ttypes))
+ lines.append("%s = (%s)" % (hs_name, tvals))
+ else:
+ lines.append("-- Skipped tuple %s, cannot convert all elements" % fqn)
+ elif isinstance(value, (list, set, frozenset)):
+ # Lists and frozensets are handled the same in Haskell: as lists,
+ # since lists are immutable and we don't need for constants the
+ # high-speed of an actual Set type. However, we can only convert
+ # them if they have the same type for all elements (which is a
+ # normal expectation for constants, our code should be well
+ # behaved); note that this is different from the tuples case,
+ # where we always (for some values of always) can convert
+ tvs = [HaskellTypeVal(elem) for elem in value]
+ if compat.all(e is not None for e in tvs):
+ ttypes, tvals = zip(*tvs)
+ uniq_types = set(ttypes)
+ if len(uniq_types) == 1:
+ values = FormatListElems(all_items, pfx_name, value, tvals)
+ lines.append("-- | Converted from Python list or set %s" % fqn)
+ lines.append("%s :: [%s]" % (hs_name, uniq_types.pop()))
+ lines.append("%s = [%s]" % (hs_name, values))
+ else:
+ lines.append("-- | Skipped list/set %s, is not homogeneous" % fqn)
+ else:
+ lines.append("-- | Skipped list/set %s, cannot convert all elems" % fqn)
+ elif isinstance(value, RE_TYPE):
+ tvs = HaskellTypeVal(value.pattern)
+ assert tvs is not None
+ lines.append("-- | Converted from Python RE object %s" % fqn)
+ lines.append("%s :: %s" % (hs_name, tvs[0]))
+ lines.append("%s = %s" % (hs_name, tvs[1]))
else:
- lines.append("-- Skipped %s, %s not handled" % (name, type(value)))
+ lines.append("-- Skipped %s, %s not handled" % (fqn, type(value)))
return lines
-def Convert():
+def Convert(module, prefix):
"""Converts the constants to Haskell.
"""
lines = [""]
- all_names = dir(constants)
+ all_items = dict((name, getattr(module, name)) for name in dir(module))
- for name in all_names:
- value = getattr(constants, name)
- lines.extend(ConvertVariable(name, value))
- lines.append("")
+ for name in sorted(all_items.keys()):
+ value = all_items[name]
+ new_lines = ConvertVariable(prefix, name, value, all_items)
+ if new_lines:
+ lines.extend(new_lines)
+ lines.append("")
return "\n".join(lines)
def main():
- print Convert()
+ print Convert(constants, "")
+ print Convert(luxi, "luxi")
if __name__ == "__main__":
projects / ganeti-local / blobdiff