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Copy pathpythonjs_to_coffee.py
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pythonjs_to_coffee.py
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459 lines (377 loc) · 11.8 KB
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#!/usr/bin/env python
# PythonJS to CoffeeScript Translator
# by Brett Hartshorn - copyright 2014
# License: "New BSD"
import sys
import ast
import pythonjs
class TransformSuperCalls( ast.NodeVisitor ):
def __init__(self, node, class_names):
self._class_names = class_names
self.visit(node)
def visit_Call(self, node):
if isinstance(node.func, ast.Attribute) and isinstance(node.func.value, ast.Name) and node.func.value.id in self._class_names:
node.func.attr = '__' + node.func.attr
class CollectNames(ast.NodeVisitor):
def __init__(self):
self._names = []
def visit_Name(self, node):
self._names.append( node )
def collect_names(node):
a = CollectNames()
a.visit( node )
return a._names
class CoffeeGenerator( pythonjs.JSGenerator ):
_classes = dict()
_class_props = dict()
def _visit_call_helper_var(self, node):
return ''
def _inline_code_helper(self, s):
s = s.replace('\n', '\\n').replace('\0', '\\0') ## AttributeError: 'BinOp' object has no attribute 's' - this is caused by bad quotes
if s.strip().startswith('#'): s = '/*%s*/'%s
if '"' in s or "'" in s: ## can not trust direct-replace hacks
pass
else:
if ' or ' in s:
s = s.replace(' or ', ' || ')
if ' not ' in s:
s = s.replace(' not ', ' ! ')
if ' and ' in s:
s = s.replace(' and ', ' && ')
return '`' + s + '`' ## enclose with backticks to inline javascript in coffeescript
def visit_While(self, node):
body = [ 'while %s' %self.visit(node.test)]
self.push()
for line in list( map(self.visit, node.body) ):
body.append( self.indent()+line )
self.pull()
return '\n'.join( body )
def _visit_subscript_ellipsis(self, node):
name = self.visit(node.value)
return '%s.$wrapped' %name
def visit_Pass(self, node):
return '###pass###'
def visit_If(self, node):
out = []
out.append( 'if %s' %self.visit(node.test) )
self.push()
for line in list(map(self.visit, node.body)):
out.append( self.indent() + line )
orelse = []
for line in list(map(self.visit, node.orelse)):
orelse.append( self.indent() + line )
self.pull()
if orelse:
out.append( self.indent() + 'else')
out.extend( orelse )
return '\n'.join( out )
def visit_List(self, node):
return '[%s]' % ', '.join(map(self.visit, node.elts))
def visit_Dict(self, node):
a = []
for i in range( len(node.keys) ):
k = self.visit( node.keys[ i ] )
v = self.visit( node.values[i] )
a.append( '%s:%s'%(k,v) )
b = ','.join( a )
return '{%s}' %b
def visit_ClassDef(self, node):
node._parents = set()
out = []
extends = False ## Dart has no support for multiple inheritance!
props = set(['$wrapped'])
bases = set()
base_classes = set()
self._classes[ node.name ] = node
self._class_props[ node.name ] = props
for decor in node.decorator_list: ## class decorators
if isinstance(decor, ast.Call):
props.update( [self.visit(a) for a in decor.args] )
elif isinstance(decor, ast.Attribute) and isinstance(decor.value, ast.Name) and decor.value.id == 'dart':
if decor.attr == 'extends':
extends = True
props.add('$wrapped')
for name_node in collect_names( node ):
if name_node.id == 'self':
name_node.id = 'this'
else:
raise SyntaxError
for base in node.bases:
n = self.visit(base)
if n == 'object':
continue
node._parents.add( n )
bases.add( n )
if n in self._class_props:
props.update( self._class_props[n] )
base_classes.add( self._classes[n] )
else: ## special case - subclassing a builtin like `list`
continue
for p in self._classes[ n ]._parents:
bases.add( p )
props.update( self._class_props[p] )
base_classes.add( self._classes[p] )
if bases:
if extends:
assert len(bases) == 1
out.append('class %s extends %s {'%(node.name, ','.join(bases)))
else:
#if bases[0] == 'object':
# out.append('class %s {' %node.name)
#else:
out.append('class %s implements %s {'%(node.name, ', '.join(bases)))
else:
out.append('class %s {' %node.name)
self.push()
for p in props:
out.append(self.indent()+ 'var %s;'%p)
method_names = set()
for b in node.body:
if isinstance(b, ast.FunctionDef) and len(b.decorator_list): ##getter/setters
for name_node in collect_names( b ):
if name_node.id == 'self':
name_node.id = 'this'
b.args.args = b.args.args[1:]
out.append( self.visit(b) )
elif extends:
if isinstance(b, ast.FunctionDef):
b.args.args = b.args.args[1:]
if b.name == node.name:
args = [self.visit(a) for a in b.args.args]
args = ','.join(args)
out.append(
self.indent()+'%s(%s) : super() { this.__init__(%s); }'%(node.name, args, args)
)
b.name = '__init__'
elif b.name == '__getitem__':
b.name = ''
b._prefix = 'operator []'
elif b.name == '__setitem__':
b.name = ''
b._prefix = 'void operator []='
elif b.name == '__add__':
b.name = ''
b._prefix = 'operator +'
elif b.name == '__iadd__':
b.name = ''
b._prefix = 'void operator +='
elif b.name == '__sub__':
b.name = ''
b._prefix = 'operator -'
elif b.name == '__mul__':
b.name = ''
b._prefix = 'operator *'
elif b.name == '__div__':
b.name = ''
b._prefix = 'operator /'
elif b.name == '__or__':
b.name = ''
b._prefix = 'operator |'
elif b.name == '__xor__':
b.name = ''
b._prefix = 'operator ^'
line = self.visit(b)
out.append( line )
elif isinstance(b, ast.FunctionDef) and b.name == node.name:
args = [self.visit(a) for a in b.args.args][1:]
args = ','.join(args)
b._prefix = 'static void'
b.name = '__init__'
out.append( self.visit(b) )
if args:
out.append(
self.indent()+'%s(%s) {%s.__init__(this,%s);}'%(node.name, args, node.name, args)
)
else:
out.append(
self.indent()+'%s() {%s.__init__(this);}'%(node.name, node.name)
)
elif isinstance(b, ast.FunctionDef):
method_names.add( b.name )
TransformSuperCalls( b, bases )
operator = False
if b.name == '__getitem__':
operator = 'operator []'
elif b.name == '__setitem__':
operator = 'operator []='
elif b.name == '__add__':
operator = 'operator +'
elif b.name == '__sub__':
operator = 'operator -'
elif b.name == '__mul__':
operator = 'operator *'
elif b.name == '__div__':
operator = 'operator /'
elif b.name == '__and__':
operator = 'operator &'
elif b.name == '__or__':
operator = 'operator |'
elif b.name == '__xor__':
operator = 'operator ^'
elif b.name == '__lshift__':
operator = 'operator <<'
elif b.name == '__rshift__':
operator = 'operator >>'
args = [self.visit(a) for a in b.args.args][1:]
args = ','.join(args)
if operator and args:
out.append(self.indent()+ '%s(%s) { return %s.__%s(this,%s); }'%(operator, args, node.name, b.name, args) )
elif operator:
out.append(self.indent()+ '%s() { return %s.__%s(this); }'%(operator, node.name, b.name) )
elif args:
out.append(self.indent()+ '%s(%s) { return %s.__%s(this,%s); }'%(b.name, args, node.name, b.name, args) )
else:
out.append(self.indent()+ '%s() { return %s.__%s(this); }'%(b.name, node.name, b.name) )
b._prefix = 'static'
name = b.name
b.name = '__%s'%name
out.append( self.visit(b) )
b.name = name
else:
line = self.visit(b)
if line.startswith('var '):
out.append( self.indent()+line )
else:
out.append( line )
if not extends and base_classes:
for bnode in base_classes:
for b in bnode.body:
if isinstance(b, ast.FunctionDef):
if b.name == '__init__': continue
if b.name in method_names: continue
args = [self.visit(a) for a in b.args.args][1:]
args = ','.join(args)
if args:
out.append(self.indent()+ '%s(%s) { return %s.__%s(this,%s); }'%(b.name, args, bnode.name, b.name, args) )
else:
out.append(self.indent()+ '%s() { return %s.__%s(this); }'%(b.name, bnode.name, b.name) )
self.pull()
out.append('}')
return '\n'.join(out)
def _visit_for_prep_iter_helper(self, node, out, iter_name):
out.append(
#self.indent() + 'if (%s is dict) { %s = %s.keys(); }' %(iter_name, iter_name, iter_name)
self.indent() + 'if (%s is dict) %s = %s.keys();' %(iter_name, iter_name, iter_name)
)
def visit_Expr(self, node):
return self.visit(node.value)
def visit_Print(self, node):
args = [self.visit(e) for e in node.values]
return 'console.log(%s)' % ', '.join(args)
def visit_Assign(self, node):
assert len(node.targets) == 1
target = node.targets[0]
if isinstance(target, ast.Tuple):
raise NotImplementedError
else:
target = self.visit(target)
value = self.visit(node.value)
code = '%s = %s;' % (target, value)
return code
def _visit_function(self, node):
getter = False
setter = False
klass = None
for decor in node.decorator_list:
if isinstance(decor, ast.Name) and decor.id == 'property':
getter = True
elif isinstance(decor, ast.Attribute) and isinstance(decor.value, ast.Name) and decor.attr == 'setter':
setter = True
elif isinstance(decor, ast.Attribute) and isinstance(decor.value, ast.Name) and decor.attr == 'prototype':
klass = self.visit(decor)
else:
raise SyntaxError(decor)
args = [] #self.visit(node.args)
oargs = []
offset = len(node.args.args) - len(node.args.defaults)
varargs = False
varargs_name = None
for i, arg in enumerate(node.args.args):
a = arg.id
dindex = i - offset
if dindex >= 0 and node.args.defaults:
default_value = self.visit( node.args.defaults[dindex] )
oargs.append( '%s=%s' %(a, default_value) )
else:
args.append( a )
if oargs:
args.extend( ','.join(oargs) )
buffer = self.indent()
if hasattr(node,'_prefix'): buffer += node._prefix + ' '
#if getter:
# buffer += 'get %s {\n' % node.name
#elif setter:
# buffer += 'set %s(%s) {\n' % (node.name, ', '.join(args))
#else:
if klass:
buffer += '%s.%s = (%s) ->\n' % (klass, node.name, ', '.join(args))
else:
buffer += '%s = (%s) ->\n' % (node.name, ', '.join(args))
self.push()
#if varargs:
# buffer += 'var %s = new list([]);\n' %varargs_name
# for i,n in enumerate(varargs):
# buffer += 'if (%s != null) %s.append(%s);\n' %(n, varargs_name, n)
body = list()
for child in node.body:
if isinstance(child, ast.Str):
continue
else:
body.append( self.indent() + self.visit(child) )
if not isinstance(node.body[-1], ast.Return):
body.append( self.indent() + '0' )
buffer += '\n'.join(body)
self.pull()
return buffer
def visit_Is(self, node):
return ' is '
def visit_IsNot(self, node):
return ' isnt '
def _visit_call_helper_instanceof(self, node):
args = map(self.visit, node.args)
if len(args) == 2:
if args[1] == 'Number':
args[1] = 'num'
return '%s is %s' %tuple(args)
else:
raise SyntaxError( args )
def visit_TryExcept(self, node):
out = ['try']
self.push()
for n in node.body:
out.append( self.indent() + self.visit(n) )
self.pull()
out.append( self.indent() + 'catch error' )
self.push()
for n in node.handlers:
out.append( self.visit(n) )
self.pull()
return '\n'.join( out )
def visit_ExceptHandler(self, node):
## TODO check exception type
out = []
if node.type:
out.append( self.indent() + '###exception: %s' %self.visit(node.type) )
for n in node.body:
out.append( self.indent() + self.visit(n) )
return '\n'.join(out)
def main(script):
tree = ast.parse(script)
return CoffeeGenerator().visit(tree)
def command():
scripts = []
if len(sys.argv) > 1:
for arg in sys.argv[1:]:
if arg.endswith('.py'):
scripts.append( arg )
if len(scripts):
a = []
for script in scripts:
a.append( open(script, 'rb').read() )
data = '\n'.join( a )
else:
data = sys.stdin.read()
js = main( data )
print( js )
if __name__ == '__main__':
command()
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