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pythonjs_to_go.py
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570 lines (461 loc) · 15 KB
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#!/usr/bin/env python
# PythonJS to Go Translator
# by Brett Hartshorn - copyright 2014
# License: "New BSD"
import os, sys
import ast
import pythonjs
class GoGenerator( pythonjs.JSGenerator ):
def __init__(self, requirejs=False, insert_runtime=False):
pythonjs.JSGenerator.__init__(self, requirejs=False, insert_runtime=False)
self._class_stack = list()
self._classes = dict()
self._class_props = dict()
self._vars = set()
self._known_vars = set()
self._kwargs_type_ = dict()
self._imports = []
def visit_ClassDef(self, node):
self._class_stack.append( node )
node._parents = set()
node._struct_def = dict()
out = []
sdef = dict()
props = set()
bases = set()
base_classes = set()
self._classes[ node.name ] = node
self._class_props[ node.name ] = props
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] )
for decor in node.decorator_list: ## class decorators
if isinstance(decor, ast.Call):
assert decor.func.id=='__struct__'
#props.update( [self.visit(a) for a in decor.args] )
for kw in decor.keywords:
props.add( kw.arg )
sdef[ kw.arg ] = kw.value.id
node._struct_def.update( sdef )
out.append( 'type %s struct {' %node.name)
if base_classes:
for bnode in base_classes:
## Go only needs the name of the parent struct and all its items are inserted automatically ##
out.append('%s' %bnode.name)
for name in sdef:
out.append('%s %s' %(name, sdef[name]))
out.append('}')
init = None
method_names = set()
for b in node.body:
assert isinstance(b, ast.FunctionDef)
method_names.add( b.name )
out.append( self.visit(b) )
if b.name == '__init__':
init = b
parent_init = None
if base_classes:
for bnode in base_classes:
for b in bnode.body:
if isinstance(b, ast.FunctionDef):
if b.name in method_names:
continue
if b.name == '__init__':
parent_init = {'class':bnode, 'init':b}
#continue
out.append( self.visit(b) )
if init or parent_init:
if parent_init:
classname = parent_init['class'].name
init = parent_init['init']
else:
classname = node.name
out.append( 'func __new__%s( %s ) *%s {' %(node.name, init._args_signature, node.name))
out.append( ' ob := %s{}' %node.name )
out.append( ' ob.__init__(%s)' %','.join(init._arg_names))
out.append( ' return &ob')
out.append('}')
else:
out.append( 'func __new__%s() *%s { return &%s{} }' %(node.name, node.name, node.name))
self._class_stack.pop()
return '\n'.join(out)
def visit_Slice(self, node):
lower = upper = step = None
if node.lower:
lower = self.visit(node.lower)
if node.upper:
upper = self.visit(node.upper)
if node.step:
step = self.visit(node.step)
if lower and upper:
return '%s:%s' %(lower,upper)
elif upper:
return ':%s' %upper
elif lower:
return '%s:'%lower
else:
raise SyntaxError('TODO slice')
def visit_Print(self, node):
r = []
for e in node.values:
s = self.visit(e)
if isinstance(e, ast.List):
r.append('fmt.Println(%s);' %s[1:-1])
else:
r.append('fmt.Println(%s);' %s)
return ''.join(r)
def visit_Expr(self, node):
return self.visit(node.value)
def visit_Import(self, node):
r = [alias.name.replace('__SLASH__', '/') for alias in node.names]
if r:
for name in r:
self._imports.append('import("%s");' %name)
return ''
def visit_Module(self, node):
header = [
'package main',
'import "fmt"'
]
lines = []
for b in node.body:
line = self.visit(b)
if line:
for sub in line.splitlines():
if sub==';':
raise SyntaxError(line)
else:
lines.append( sub )
else:
if isinstance(b, ast.Import):
pass
else:
raise SyntaxError(b)
lines.append('type _kwargs_type_ struct {')
for name in self._kwargs_type_:
type = self._kwargs_type_[name]
lines.append( ' %s %s' %(name,type))
lines.append( ' __use__%s bool' %name)
lines.append('}')
lines = header + self._imports + lines
return '\n'.join( lines )
def visit_Compare(self, node):
comp = [ '(']
comp.append( self.visit(node.left) )
comp.append( ')' )
for i in range( len(node.ops) ):
comp.append( self.visit(node.ops[i]) )
if isinstance(node.comparators[i], ast.BinOp):
comp.append('(')
comp.append( self.visit(node.comparators[i]) )
comp.append(')')
else:
comp.append( self.visit(node.comparators[i]) )
return ' '.join( comp )
def visit_For(self, node):
target = self.visit(node.target)
lines = []
if isinstance(node.iter, ast.Call) and isinstance(node.iter.func, ast.Name):
if node.iter.func.id == 'range':
if len(node.iter.args)==1:
iter = self.visit(node.iter.args[0])
lines.append('for %s := 0; %s < %s; %s++ {' %(target, target, iter, target))
elif len(node.iter.args)==2:
start = self.visit(node.iter.args[0])
iter = self.visit(node.iter.args[1])
lines.append('for %s := %s; %s < %s; %s++ {' %(target, start, target, iter, target))
else:
raise SyntaxError('invalid for range loop')
elif node.iter.func.id == 'enumerate':
iter = self.visit(node.iter.args[0])
idx = self.visit(node.target.elts[0])
tar = self.visit(node.target.elts[1])
lines.append('for %s,%s := range %s {' %(idx,tar, iter))
else:
raise SyntaxError('invalid for loop - bad iterator')
elif isinstance(node.target, ast.List) or isinstance(node.target, ast.Tuple):
iter = self.visit( node.iter )
key = self.visit(node.target.elts[0])
val = self.visit(node.target.elts[1])
lines.append('for %s,%s := range %s {' %(key,val, iter))
else:
iter = self.visit( node.iter )
lines.append('for _,%s := range %s {' %(target, iter))
self.push()
for b in node.body:
lines.append( self.indent()+self.visit(b) )
self.pull()
lines.append( self.indent()+'}' ) ## end of for loop
return '\n'.join(lines)
def _visit_call_helper(self, node):
fname = self.visit(node.func)
if fname=='__DOLLAR__': fname = '$'
elif fname == 'range':
assert len(node.args)
fname += str(len(node.args))
if node.args:
args = [self.visit(e) for e in node.args]
args = ', '.join([e for e in args if e])
else:
args = ''
if node.keywords:
if args: args += ','
args += '_kwargs_type_{'
x = ['%s:%s' %(kw.arg,self.visit(kw.value)) for kw in node.keywords]
x.extend( ['__use__%s:true' %kw.arg for kw in node.keywords] )
args += ','.join( x )
args += '}'
if node.starargs:
if args: args += ','
args += '%s...' %self.visit(node.starargs)
return '%s(%s)' % (fname, args)
def _visit_call_helper_go(self, node):
name = self.visit(node.func)
if name == '__go__':
return 'go %s' %self.visit(node.args[0])
elif name == '__go_make__':
if len(node.args)==2:
return 'make(%s, %s)' %(self.visit(node.args[0]), self.visit(node.args[1]))
elif len(node.args)==3:
return 'make(%s, %s, %s)' %(self.visit(node.args[0]), self.visit(node.args[1]), self.visit(node.args[1]))
else:
raise SyntaxError('go make requires 2 or 3 arguments')
elif name == '__go_make_chan__':
return 'make(chan %s)' %self.visit(node.args[0])
elif name == '__go__array__':
if isinstance(node.args[0], ast.BinOp):# and node.args[0].op == '<<': ## todo assert right is `typedef`
a = self.visit(node.args[0].left)
return '[]%s' %a
else:
a = self.visit(node.args[0])
return '[]%s{}' %a
else:
raise SyntaxError(name)
def visit_Return(self, node):
if isinstance(node.value, ast.Tuple):
return 'return %s' % ', '.join(map(self.visit, node.value.elts))
if node.value:
return 'return %s' % self.visit(node.value)
return 'return'
def _visit_function(self, node):
if self._function_stack[0] is node:
self._vars = set()
self._known_vars = set()
args_typedefs = {}
chan_args_typedefs = {}
return_type = None
for decor in node.decorator_list:
if isinstance(decor, ast.Call) and isinstance(decor.func, ast.Name) and decor.func.id == '__typedef__':
for key in decor.keywords:
#args_typedefs[ key.arg ] = key.value.id
args_typedefs[ key.arg ] = self.visit(key.value)
elif isinstance(decor, ast.Call) and isinstance(decor.func, ast.Name) and decor.func.id == '__typedef_chan__':
for key in decor.keywords:
chan_args_typedefs[ key.arg ] = self.visit(key.value)
elif isinstance(decor, ast.Call) and isinstance(decor.func, ast.Name) and decor.func.id == 'returns':
if decor.keywords:
raise SyntaxError('invalid go return type')
else:
return_type = decor.args[0].id
node._arg_names = []
args = []
oargs = []
offset = len(node.args.args) - len(node.args.defaults)
varargs = False
varargs_name = None
is_method = False
for i, arg in enumerate(node.args.args):
arg_name = arg.id
if arg_name not in args_typedefs.keys()+chan_args_typedefs.keys():
if arg_name=='self':
assert i==0
is_method = True
continue
else:
err = 'error in function: %s' %node.name
err += '\n missing typedef: %s' %arg.id
raise SyntaxError(err)
if arg_name in args_typedefs:
arg_type = args_typedefs[arg_name]
a = '%s %s' %(arg_name, arg_type)
else:
arg_type = chan_args_typedefs[arg_name]
a = '%s chan %s' %(arg_name, arg_type)
dindex = i - offset
if a.startswith('__variable_args__'): ## TODO support go `...` varargs
#varargs_name = a.split('__')[-1]
#varargs = ['_vararg_%s'%n for n in range(16) ]
#args.append( '[%s]'%','.join(varargs) )
raise SyntaxError('TODO *args')
elif dindex >= 0 and node.args.defaults:
default_value = self.visit( node.args.defaults[dindex] )
self._kwargs_type_[ arg_name ] = arg_type
oargs.append( (arg_name, default_value) )
else:
args.append( a )
node._arg_names.append( arg_name )
if oargs:
#args.append( '[%s]' % ','.join(oargs) )
#args.append( '{%s}' % ','.join(oargs) )
args.append( '__kwargs _kwargs_type_')
node._arg_names.append( '__kwargs' )
if node.args.vararg:
starargs = node.args.vararg
assert starargs in args_typedefs
args.append( '%s ...%s' %(starargs, args_typedefs[starargs]))
node._arg_names.append( starargs )
node._args_signature = ','.join(args)
####
if is_method:
assert self._class_stack
method = '(self *%s) ' %self._class_stack[-1].name
else:
method = ''
out = []
if return_type:
out.append( self.indent() + 'func %s%s(%s) %s {\n' % (method, node.name, ', '.join(args), return_type) )
else:
out.append( self.indent() + 'func %s%s(%s) {\n' % (method, node.name, ', '.join(args)) )
self.push()
if oargs:
for n,v in oargs:
out.append('%s := %s' %(n,v))
out.append('if __kwargs.__use__%s {' %n )
out.append( ' %s = __kwargs.%s' %(n,n))
out.append('}')
#out.append('} else { %s := %s }' %(n,v))
for b in node.body:
v = self.visit(b)
if v:
out.append( self.indent() + v )
self.pull()
out.append( self.indent()+'}' )
return '\n'.join(out)
def _visit_call_helper_var(self, node):
args = [ self.visit(a) for a in node.args ]
#if args:
# out.append( 'var ' + ','.join(args) )
if node.keywords:
for key in node.keywords:
args.append( key.arg )
for name in args:
if name not in self._vars:
self._vars.add( name )
#out = []
#for v in args:
# out.append( self.indent() + 'var ' + v + ' int')
#return '\n'.join(out)
return ''
def visit_With(self, node):
r = []
is_switch = False
if isinstance( node.context_expr, ast.Name ) and node.context_expr.id == '__default__':
r.append('default:')
elif isinstance( node.context_expr, ast.Name ) and node.context_expr.id == '__select__':
r.append('select {')
is_switch = True
elif isinstance( node.context_expr, ast.Call ):
if not isinstance(node.context_expr.func, ast.Name):
raise SyntaxError( self.visit(node.context_expr))
if len(node.context_expr.args):
a = self.visit(node.context_expr.args[0])
else:
assert len(node.context_expr.keywords)
## need to catch if this is a new variable ##
name = node.context_expr.keywords[0].arg
if name not in self._known_vars:
a = '%s := %s' %(name, self.visit(node.context_expr.keywords[0].value))
else:
a = '%s = %s' %(name, self.visit(node.context_expr.keywords[0].value))
if node.context_expr.func.id == '__case__':
r.append('case %s:' %a)
elif node.context_expr.func.id == '__switch__':
r.append('switch (%s) {' %self.visit(node.context_expr.args[0]))
is_switch = True
else:
raise SyntaxError( 'invalid use of with')
for b in node.body:
a = self.visit(b)
if a: r.append(a)
if is_switch:
r.append('}')
return '\n'.join(r)
def visit_Assign(self, node):
target = node.targets[0]
if isinstance(target, ast.Tuple):
raise NotImplementedError('TODO')
elif isinstance(node.value, ast.BinOp) and self.visit(node.value.op)=='<<' and isinstance(node.value.left, ast.Name) and node.value.left.id=='__go__send__':
target = self.visit(target)
value = self.visit(node.value.right)
return '%s <- %s;' % (target, value)
elif not self._function_stack:
target = self.visit(target)
value = self.visit(node.value)
return 'var %s = %s;' % (target, value)
elif isinstance(node.targets[0], ast.Name) and target.id in self._vars:
target = self.visit(target)
value = self.visit(node.value)
self._vars.remove( target )
self._known_vars.add( target )
return '%s := %s;' % (target, value)
else:
target = self.visit(target)
value = self.visit(node.value)
#if '<-' in value:
# raise RuntimeError(target+value)
return '%s = %s;' % (target, value)
def visit_While(self, node):
cond = self.visit(node.test)
if cond == 'true' or cond == '1': cond = ''
body = [ 'for %s {' %cond]
self.push()
for line in list( map(self.visit, node.body) ):
body.append( self.indent()+line )
self.pull()
body.append( self.indent() + '}' )
return '\n'.join( body )
def _inline_code_helper(self, s):
return s
#return 'js.Global.Call("eval", "%s")' %s ## TODO inline JS()
def main(script, insert_runtime=True):
if insert_runtime:
dirname = os.path.dirname(os.path.abspath(__file__))
dirname = os.path.join(dirname, 'runtime')
runtime = open( os.path.join(dirname, 'go_builtins.py') ).read()
script = runtime + '\n' + script
tree = ast.parse(script)
#return GoGenerator().visit(tree)
try:
return GoGenerator().visit(tree)
except SyntaxError as err:
sys.stderr.write(script)
raise err
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()
out = main( data )
print( out )
if __name__ == '__main__':
command()
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