def do_switch(source, start):
start += 6 # pass switch
code = 'while 1:\n' + indent('SWITCHED = False\nCONDITION = (%s)\n')
# parse value of check
val, start = pass_bracket(source, start, '()')
if val is None:
raise SyntaxError('Missing () after switch statement')
if not val.strip():
raise SyntaxError('Missing content inside () after switch statement')
code = code % exp_translator(val)
bra, start = pass_bracket(source, start, '{}')
if bra is None:
raise SyntaxError('Missing block {} after switch statement')
bra_pos = 0
bra = bra[1:-1] + ';'
while True:
case = except_keyword(bra, bra_pos, 'case')
default = except_keyword(bra, bra_pos, 'default')
assert not (case and default)
if case or default: # this ?: expression makes things much harder....
case_code = None
if case:
case_code = 'if SWITCHED or PyJsStrictEq(CONDITION, %s):\n'
# we are looking for a first : with count 1. ? gives -1 and : gives +1.
count = 0
for pos, e in enumerate(bra[case:], case):
if e == '?':
count -= 1
elif e == ':':
count += 1
if count == 1:
break
else:
raise SyntaxError(
'Missing : token after case in switch statement')
case_condition = exp_translator(
bra[case:pos]) # switch {case CONDITION: statements}
case_code = case_code % case_condition
case = pos + 1
if default:
case = except_token(bra, default, ':')
case_code = 'if True:\n'
# now parse case statements (things after ':' )
cand, case = do_statement(bra, case)
while cand:
case_code += indent(cand)
cand, case = do_statement(bra, case)
case_code += indent('SWITCHED = True\n')
code += indent(case_code)
bra_pos = case
else:
break
# prevent infinite loop :)
code += indent('break\n')
return code, start
def do_return(source, start):
start += 6 # pass return
end = source.find(';', start)+1
if end==-1:
end = len(source)
trans = exp_translator(source[start:end].rstrip(';'))
return 'return %s\n' % (trans if trans else "var.get('undefined')"), end
def do_expression(source, start):
start = pass_white(source, start)
end = pass_until(source, start, tokens=(';',))
if end==start+1: #empty statement
return 'pass\n', end
# AUTOMATIC SEMICOLON INSERTION FOLLOWS
# Without ASI this function would end with: return exp_translator(source[start:end].rstrip(';'))+'\n', end
# ASI makes things a bit more complicated:
# we will try to parse as much as possible, inserting ; in place of last new line in case of error
rev = False
rpos = 0
while True:
try:
code = source[start:end].rstrip(';')
cand = exp_translator(code)+'\n', end
just_to_test = compile(cand[0], '', 'exec')
return cand
except Exception as e:
if not rev:
rev = source[start:end][::-1]
lpos = rpos
while True:
rpos = pass_until(rev, rpos, LINE_TERMINATOR)
if rpos>=len(rev):
raise
if filter(lambda x: x not in SPACE, rev[lpos:rpos]):
break
end = start + len(rev) - rpos + 1
def do_return(source, start):
start += 6 # pass return
end = source.find(';', start) + 1
if end == -1:
end = len(source)
trans = exp_translator(source[start:end].rstrip(';'))
return 'return %s\n' % (trans if trans else "var.get('undefined')"), end
def do_expression(source, start):
start = pass_white(source, start)
end = pass_until(source, start, tokens=(';', ))
if end == start + 1: #empty statement
return 'pass\n', end
# AUTOMATIC SEMICOLON INSERTION FOLLOWS
# Without ASI this function would end with: return exp_translator(source[start:end].rstrip(';'))+'\n', end
# ASI makes things a bit more complicated:
# we will try to parse as much as possible, inserting ; in place of last new line in case of error
rev = False
rpos = 0
while True:
try:
code = source[start:end].rstrip(';')
cand = exp_translator(code) + '\n', end
just_to_test = compile(cand[0], '', 'exec')
return cand
except Exception as e:
if not rev:
rev = source[start:end][::-1]
lpos = rpos
while True:
rpos = pass_until(rev, rpos, LINE_TERMINATOR)
if rpos >= len(rev):
raise
if filter(lambda x: x not in SPACE, rev[lpos:rpos]):
break
end = start + len(rev) - rpos + 1
def do_switch(source, start):
start += 6 # pass switch
code = 'while 1:\n' + indent('SWITCHED = False\nCONDITION = (%s)\n')
# parse value of check
val, start = pass_bracket(source, start, '()')
if val is None:
raise SyntaxError('Missing () after switch statement')
if not val.strip():
raise SyntaxError('Missing content inside () after switch statement')
code = code % exp_translator(val)
bra, start = pass_bracket(source, start, '{}')
if bra is None:
raise SyntaxError('Missing block {} after switch statement')
bra_pos = 0
bra = bra[1:-1] + ';'
while True:
case = except_keyword(bra, bra_pos, 'case')
default = except_keyword(bra, bra_pos, 'default')
assert not (case and default)
if case or default: # this ?: expression makes things much harder....
case_code = None
if case:
case_code = 'if SWITCHED or PyJsStrictEq(CONDITION, %s):\n'
# we are looking for a first : with count 1. ? gives -1 and : gives +1.
count = 0
for pos, e in enumerate(bra[case:], case):
if e=='?':
count -= 1
elif e==':':
count += 1
if count==1:
break
else:
raise SyntaxError('Missing : token after case in switch statement')
case_condition = exp_translator(bra[case:pos]) # switch {case CONDITION: statements}
def translate_object(obj, lval, obj_count=1, arr_count=1):
obj = obj[1:-1] # remove {} from both ends
obj, obj_rep, obj_count = remove_objects(obj, obj_count)
obj, arr_rep, arr_count = remove_arrays(obj, arr_count)
# functions can be defined inside objects. exp translator cant translate them.
# we have to remove them and translate with func translator
# its better explained in translate_array function
obj, hoisted, inline = functions.remove_functions(obj, all_inline=True)
assert not hoisted
gsetters_after = ''
keys = argsplit(obj)
res = []
for i, e in enumerate(keys, 1):
e = e.strip()
if e.startswith('set '):
gsetters_after += translate_setter(lval, e)
elif e.startswith('get '):
gsetters_after += translate_getter(lval, e)
elif ':' not in e:
if i < len(keys
): # can happen legally only in the last element {3:2,}
raise SyntaxError('Unexpected "," in Object literal')
break
else: #Not getter, setter or elision
spl = argsplit(e, ':')
if len(spl) < 2:
raise SyntaxError('Invalid Object literal: ' + e)
try:
key, value = spl
except: #len(spl)> 2
print 'Unusual case ' + repr(e)
key = spl[0]
value = ':'.join(spl[1:])
key = key.strip()
if is_internal(key):
key = '%s.to_string().value' % key
else:
key = repr(key)
value = exp_translator(value)
if not value:
raise SyntaxError('Missing value in Object literal')
res.append('%s:%s' % (key, value))
res = '%s = Js({%s})\n' % (lval, ','.join(res)) + gsetters_after
# translate all the nested objects (including removed earlier functions)
for nested_name, nested_info in inline.iteritems(): # functions
nested_block, nested_args = nested_info
new_def = FUNC_TRANSLATOR(nested_name, nested_block, nested_args)
res = new_def + res
for lval, obj in obj_rep.iteritems(): #objects
new_def, obj_count, arr_count = translate_object(
obj, lval, obj_count, arr_count)
# add object definition BEFORE array definition
res = new_def + res
for lval, obj in arr_rep.iteritems(): # arrays
new_def, obj_count, arr_count = translate_array(
obj, lval, obj_count, arr_count)
# add object definition BEFORE array definition
res = new_def + res
return res, obj_count, arr_count
def do_bracket_exp(source, start, throw=True):
bra, cand = pass_bracket(source, start, '()')
if throw and not bra:
raise SyntaxError('Missing bracket expression')
bra = exp_translator(bra[1:-1])
if throw and not bra:
raise SyntaxError('Empty bracket condition')
return bra, cand if bra else start
def do_bracket_exp(source, start, throw=True):
bra, cand = pass_bracket(source, start, '()')
if throw and not bra:
raise SyntaxError('Missing bracket expression')
bra = exp_translator(bra[1:-1])
if throw and not bra:
raise SyntaxError('Empty bracket condition')
return bra, cand if bra else start
def do_throw(source, start):
start += 5 # pass throw
end = source.find(';', start)+1
if not end:
end = len(source)
trans = exp_translator(source[start:end].rstrip(';'))
if not trans:
raise SyntaxError('Invalid throw statement: nothing to throw')
res = 'PyJsTempException = JsToPyException(%s)\nraise PyJsTempException\n' % trans
return res, end
def do_throw(source, start):
start += 5 # pass throw
end = source.find(';', start) + 1
if not end:
end = len(source)
trans = exp_translator(source[start:end].rstrip(';'))
if not trans:
raise SyntaxError('Invalid throw statement: nothing to throw')
res = 'PyJsTempException = JsToPyException(%s)\nraise PyJsTempException\n' % trans
return res, end
def do_var(source, start):
#todo auto ; insertion
start += 3 #pass var
end = pass_until(source, start, tokens=(';',))
defs = argsplit(source[start:end-1]) # defs is the list of defined vars with optional initializer
code = ''
for de in defs:
var, var_end = parse_identifier(de, 0, True)
TO_REGISTER.append(var)
var_end = pass_white(de, var_end)
if var_end<len(de): # we have something more to parse... It has to start with =
if de[var_end] != '=':
raise SyntaxError('Unexpected initializer in var statement. Expected "=", got "%s"'%de[var_end])
code += exp_translator(de) + '\n'
if not code.strip():
code = 'pass\n'
return code, end
def do_var(source, start):
#todo auto ; insertion
start += 3 #pass var
end = pass_until(source, start, tokens=(';',))
defs = argsplit(source[start:end-1]) # defs is the list of defined vars with optional initializer
code = ''
for de in defs:
var, var_end = parse_identifier(de, 0, True)
TO_REGISTER.append(var)
var_end = pass_white(de, var_end)
if var_end<len(de): # we have something more to parse... It has to start with =
if de[var_end] != '=':
raise SyntaxError('Unexpected initializer in var statement. Expected "=", got "%s"'%de[var_end])
code += exp_translator(de) + '\n'
if not code.strip():
code = 'pass\n'
return code, end
def do_for(source, start):
start += 3 # pass for
entered = start
bra, start = pass_bracket(source, start, '()')
inside, start = do_statement(source, start)
if inside is None:
raise SyntaxError('Missing statement after for')
bra = bra[1:-1]
if ';' in bra:
init = argsplit(bra, ';')
if len(init) != 3:
raise SyntaxError('Invalid for statement')
args = []
for i, item in enumerate(init):
end = pass_white(item, 0)
if end == len(item):
args.append('' if i != 1 else '1')
continue
if not i and except_keyword(item, end, 'var') is not None:
# var statement
args.append(do_var(item, end)[0])
continue
args.append(do_expression(item, end)[0])
return '#for JS loop\n%swhile %s:\n%s%s\n' % (
args[0], args[1].strip(), indent(inside), indent(args[2])), start
# iteration
end = pass_white(bra, 0)
register = False
if bra[end:].startswith('var '):
end += 3
end = pass_white(bra, end)
register = True
name, end = parse_identifier(bra, end)
if register:
TO_REGISTER.append(name)
end = pass_white(bra, end)
if bra[end:end + 2] != 'in' or bra[end + 2] in IDENTIFIER_PART:
#print source[entered-10:entered+50]
raise SyntaxError('Invalid "for x in y" statement')
end += 2 # pass in
exp = exp_translator(bra[end:])
res = 'for temp in %s:\n' % exp
res += indent('var.put(%s, temp)\n' % name.__repr__()) + indent(inside)
return res, start
def do_for(source, start):
start += 3 # pass for
entered = start
bra, start = pass_bracket(source, start, '()')
inside, start = do_statement(source, start)
if inside is None:
raise SyntaxError('Missing statement after for')
bra = bra[1:-1]
if ';' in bra:
init = argsplit(bra, ';')
if len(init) != 3:
raise SyntaxError('Invalid for statement')
args = []
for i, item in enumerate(init):
end = pass_white(item, 0)
if end == len(item):
args.append('' if i != 1 else '1')
continue
if not i and except_keyword(item, end, 'var') is not None:
# var statement
args.append(do_var(item, end)[0])
continue
args.append(do_expression(item, end)[0])
return '#for JS loop\n%swhile %s:\n%s%s\n' % (
args[0], args[1].strip(), indent(inside), indent(args[2])), start
# iteration
end = pass_white(bra, 0)
register = False
if bra[end:].startswith('var '):
end += 3
end = pass_white(bra, end)
register = True
name, end = parse_identifier(bra, end)
if register:
TO_REGISTER.append(name)
end = pass_white(bra, end)
if bra[end:end + 2] != 'in' or bra[end + 2] in IDENTIFIER_PART:
#print source[entered-10:entered+50]
raise SyntaxError('Invalid "for x in y" statement')
end += 2 # pass in
exp = exp_translator(bra[end:])
res = 'for temp in %s:\n' % exp
res += indent('var.put(%s, temp)\n' % name.__repr__()) + indent(inside)
return res, start
def translate_array(array, lval, obj_count=1, arr_count=1):
"""array has to be any js array for example [1,2,3]
lval has to be name of this array.
Returns python code that adds lval to the PY scope it should be put before lval"""
array = array[1:-1]
array, obj_rep, obj_count = remove_objects(array, obj_count)
array, arr_rep, arr_count = remove_arrays(array, arr_count)
#functions can be also defined in arrays, this caused many problems since in Python
# functions cant be defined inside literal
# remove functions (they dont contain arrays or objects so can be translated easily)
# hoisted functions are treated like inline
array, hoisted, inline = functions.remove_functions(array, all_inline=True)
assert not hoisted
arr = []
# separate elements in array
for e in argsplit(array, ','):
# translate expressions in array PyJsLvalInline will not be translated!
e = exp_translator(e.replace('\n', ''))
arr.append(e if e else 'None')
arr = '%s = Js([%s])\n' % (lval, ','.join(arr))
#But we can have more code to add to define arrays/objects/functions defined inside this array
# translate nested objects:
# functions:
for nested_name, nested_info in inline.iteritems():
nested_block, nested_args = nested_info
new_def = FUNC_TRANSLATOR(nested_name, nested_block, nested_args)
arr = new_def + arr
for lval, obj in obj_rep.iteritems():
new_def, obj_count, arr_count = translate_object(
obj, lval, obj_count, arr_count)
# add object definition BEFORE array definition
arr = new_def + arr
for lval, obj in arr_rep.iteritems():
new_def, obj_count, arr_count = translate_array(
obj, lval, obj_count, arr_count)
# add object definition BEFORE array definition
arr = new_def + arr
return arr, obj_count, arr_count
