#!/usr/bin/env python

# -*- coding: utf-8 -*-

# java2python.mod.basic -> functions to revise generated source strings.

from itertools import count

from logging import info, warn

from os import path

from re import sub as rxsub

from java2python.lib import FS

def shebangLine(module):

""" yields the canonical python shebang line. """

yield '#!/usr/bin/env python'

def encodingLine(encoding='utf-8'):

""" returns a function to yield the specified encoding line.

Note that this function isn't wired up because the encoding is

specified for the source directly, and adding this line produces a

syntax error when the compile function is used.

"""

def line(module):

yield '# -*- coding: {0} -*-'.format(encoding)

return line

def simpleDocString(obj):

""" yields multiple lines for a default docstring.

This generator works for modules, classes, and functions.

"""

yield '""" generated source for {0} {1} """'.format(obj.typeName, obj.name)

def commentedImports(module, expr):

module.factory.comment(parent=module, left=expr, fs='#import {left}')

def simpleImports(module, expr):

module.factory.expr(parent=module, left=expr, fs='import {left}')

def commentedPackages(module, expr):

module.factory.comment(parent=module, left=expr, fs='# package: {left}')

def namespacePackages(module, expr):

source = module.sourceFilename

if not source:

warn('namespace package not created; source input not named.')

return

initname = path.join(path.dirname(source), '__init__.py')

if path.exists(initname):

warn('namespace package not created; __init__.py exists.')

return

with open(initname, 'w') as initfile:

initfile.write('from pkgutil import extend_path\n')

initfile.write('__path__ = extend_path(__path__, __name__)\n')

# wrong

initfile.write('\nfrom {0} import {0}\n'.format(module.name))

info('created __init__.py file for package %s.', expr)

def enumConstInts(enum, index, name):

return str(index)

def enumConstStrings(enum, index, name):

return repr(name)

scriptTemplate = """\n

if __name__ == '__main__':

{indent}import sys

{indent}{name}.main(sys.argv)"""

def scriptMainStanza(module):

def filterClass(x):

return x.isClass and x.name==module.name

def filterMethod(x):

return x.isMethod and x.isPublic and x.isStatic and \

x.isVoid and x.name=='main'

for cls in [c for c in module.children if filterClass(c)]:

if [m for m in cls.children if filterMethod(m)]:

yield scriptTemplate.format(indent=module.indent, name=module.name)

break

def outputSubs(obj, text):

subsname = '{0}OutputSubs'.format(obj.typeName)

subs = obj.config.every(subsname, [])

for sub in subs:

for pattern, repl in sub:

text = rxsub(pattern, repl, text)

return text

def overloadedClassMethods(method):

"""

NB: this implementation does not handle overloaded static (or

class) methods, only instance methods.

"""

cls = method.parent

methods = [o for o in cls.children if o.isMethod and o.name==method.name]

if len(methods) == 1:

if methods[0].overloaded:

yield methods[0].overloaded

return

for i, m in enumerate(methods[1:]):

args = [p['type'] for p in m.parameters]

args = ', '.join(args)

m.overloaded = '@{0}.register({1})'.format(method.name, args)

m.name = '{0}_{1}'.format(method.name, i)

# for this one only:

yield '@overloaded'

def maybeClassMethod(method):

if method.isStatic and 'classmethod' not in method.decorators:

yield '@classmethod'

def maybeAbstractMethod(method):

if method.parent and method.parent.isInterface:

yield '@abstractmethod'

def maybeSynchronizedMethod(method):

if 'synchronized' in method.modifiers:

yield '@synchronized'

def globalNameCounter(original, counter=count()):

return '__{0}_{1}'.format(original, counter.next())

def getBsrSrc():

from inspect import getsource

from java2python.mod.include.bsr import bsr

return getsource(bsr)

def getSyncHelpersSrc():

from inspect import getsource

from java2python.mod.include import sync

return getsource(sync)

def maybeBsr(module):

if getattr(module, 'needsBsrFunc', False):

for line in getBsrSrc().split('\n'):

yield line

def maybeAbstractHelpers(module):

if getattr(module, 'needsAbstractHelpers', False):

yield 'from abc import ABCMeta, abstractmethod'

def maybeSyncHelpers(module):

if getattr(module, 'needsSyncHelpers', False):

for line in getSyncHelpersSrc().split('\n'):

yield line

def classContentSort(obj):

isMethod = lambda x:x and x.isMethod

def iterBody(body):

group = []

for value in body:

if isMethod(value):

group.append(value)

yield group

group = []

else:

group.append(value)

yield group

def sortBody(group):

methods = [item for item in group if isMethod(item)]

return methods[0].name if methods else -1

grp = list(iterBody(obj.children))

grpsrt = sorted(grp, key=sortBody)

obj.children = [item for grp in grpsrt for item in grp]

def defaultParams(obj):

return iter(obj.parameters)

def zopeInterfaceMethodParams(obj):

if not obj.parent.isInterface:

for param in obj.parameters:

yield param

else:

for index, param in enumerate(obj.parameters):

if index != 0 and param['name'] != 'self':

yield param

normalBases = ('object', )

def defaultBases(obj):

return iter(obj.bases or normalBases)

def zopeInterfaceBases(obj):

return iter(obj.bases or ['zope.interface.Interface'])

def implAny(obj):

for module in obj.parents(lambda x:x.isModule):

for name in obj.bases:

if any(module.find(lambda v:v.name == name)):

return True

def zopeImplementsClassBases(obj):

return iter(normalBases) if implAny(obj) else defaultBases(obj)

def zopeImplementsClassHead(obj):

if implAny(obj):

for cls in obj.bases:

yield 'zope.interface.implements({})'.format(cls)

def moveStaticExpressions(cls):

name = '{}.'.format(cls.name) # notice the dot

exprs = [child for child in cls.children if child.isExpression and name in str(child)]

module = cls.parents(lambda x:x.isModule).next()

for expr in exprs:

cls.children.remove(expr)

newExpr = module.factory.expr(fs=name + '{right}', right=expr)

module.adopt(newExpr, index=len(module.children))

def castCtor(expr, node):

expr.fs = FS.l + '(' + FS.r + ')'

def castDrop(expr, node):

expr.fs = FS.r