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""" test file to experiment with a an adapted CPython grammar """
import py
from rpython.rlib.parsing.lexer import Lexer, SourcePos, Token
from rpython.rlib.parsing.deterministic import LexerError
from rpython.rlib.parsing.tree import Nonterminal, Symbol, RPythonVisitor
from rpython.rlib.parsing.parsing import PackratParser, Symbol, ParseError, Rule
from rpython.rlib.parsing.ebnfparse import parse_ebnf, make_parse_function
grammar = py.path.local(__file__).dirpath().join("pygrammar.txt").read(mode='rt')
def test_parse_grammar():
_, rules, ToAST = parse_ebnf(grammar)
def test_parse_python_args():
regexs, rules, ToAST = parse_ebnf("""
IGNORE: " ";
NAME: "[a-zA-Z_]*";
NUMBER: "0|[1-9][0-9]*";
parameters: ["("] >varargslist<? [")"];
varargslist: (fpdef ("=" test)? [","])* star_or_starstarargs |
fpdef ("=" test)? ([","] fpdef ("=" test)?)* [","]?;
star_or_starstarargs: "*" NAME [","] "**" NAME | "*" NAME | "**" NAME;
fpdef: <NAME> | "(" <fplist> ")";
fplist: fpdef ([","] fpdef)* [","]?;
test: NUMBER;
""")
parse = make_parse_function(regexs, rules)
t = parse("(a)").visit(ToAST())[0]
t = parse("(a,)").visit(ToAST())[0]
t = parse("(a,b,c,d)").visit(ToAST())[0]
t = parse("(a,b,c,d,)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d,)").visit(ToAST())[0]
t = parse("((a, b, (d, e, (f, g))), b, *args, **kwargs)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d,*args)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d,**kwargs)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d,*args, **args)").visit(ToAST())[0]
t = parse("()").visit(ToAST())[0]
t = parse("(*args, **args)").visit(ToAST())[0]
t = parse("(a=1)").visit(ToAST())[0]
t = parse("(a=2,)").visit(ToAST())[0]
t = parse("(a,b,c,d=3)").visit(ToAST())[0]
t = parse("(a,b,c,d=4,)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,(c, d)=1,)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d=1,*args)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,d=2,**kwargs)").visit(ToAST())[0]
t = parse("((a, b, c),b,c,(c, d)=4,*args, **args)").visit(ToAST())[0]
t = parse("(self, a, b, args)").visit(ToAST())[0]
def test_parse_funcdef():
regexs, rules, ToAST = parse_ebnf("""
IGNORE: " ";
NAME: "[a-zA-Z_]*";
NUMBER: "0|[1-9][0-9]*";
funcdef: "def" NAME parameters ":" suite;
parameters: ["("] >varargslist< [")"] | ["("] [")"];
varargslist: (fpdef ("=" test)? ",")* star_or_starstarargs |
fpdef ("=" test)? ("," fpdef ("=" test)?)* ","?;
star_or_starstarargs: "*" NAME "," "**" NAME | "*" NAME | "**" NAME;
fpdef: NAME | "(" fplist ")";
fplist: fpdef ("," fpdef)* ","?;
test: NUMBER;
suite: simple_stmt | ["NEWLINE"] ["INDENT"] stmt+ ["DEDENT"];
simple_stmt: stmt;
stmt: "pass";
""")
parse = make_parse_function(regexs, rules)
t = parse("def f(a): NEWLINE INDENT pass DEDENT").visit(ToAST())[0]
class TestParser(object):
def setup_class(cls):
from rpython.rlib.parsing.parsing import PackratParser
regexs, rules, ToAST = parse_ebnf(grammar)
cls.ToAST = ToAST()
cls.parser = PackratParser(rules, rules[0].nonterminal)
cls.regexs = regexs
names, regexs = zip(*regexs)
cls.lexer = Lexer(list(regexs), list(names))
def parse(self, source):
tokens = list(self.tokenize(source))
s = self.parser.parse(tokens)
return s
def tokenize(self, source):
# use tokenize module but rewrite tokens slightly
import tokenize, cStringIO
pos = 0
readline = cStringIO.StringIO(source).readline
for token in tokenize.generate_tokens(readline):
typ, s, (row, col), _, line = token
row -= 1
pos += len(s)
typ = tokenize.tok_name[typ]
if typ == "ENDMARKER":
typ = s = "EOF"
elif typ == "NL":
continue
elif typ == "COMMENT":
continue
try:
tokens = self.lexer.tokenize(s, eof=False)
if len(tokens) == 1:
yield tokens[0]
continue
except LexerError:
pass
yield Token(typ, s, SourcePos(pos, row, col))
def test_simple(self):
t = self.parse("""
def f(x, null=0):
if x >= null:
return null + x
else:
pass
return null - x
""")
t = self.ToAST.transform(t)
def test_class(self):
t = self.parse("""
class A(object):
def __init__(self, a, b, *args):
self.a = a
self.b = b
if args:
self.len = len(args)
self.args = [a, b] + list(args)
def diagonal(self):
return (self.a ** 2 + self.b ** 2) ** 0.5
""")
t = self.ToAST.transform(t)
def test_while(self):
t = self.parse("""
def f(x, null=0):
i = null
result = 0
while i < x:
result += i
i += 1
if result % 625 == 13:
break
else:
return result - 15
return result
""")
t = self.ToAST.transform(t)
def test_comment(self):
t = self.parse("""
def f(x):
# this does some fancy stuff
return x
""")
t = self.ToAST.transform(t)
def test_parse_print(self):
t = self.parse("""
print >> f, a, b, c,
print >> f, a, b
print >> f
print
print 1
print 1, 2
print 1, 2,
""")
t = self.ToAST.transform(t)
def test_assignment(self):
t = self.parse("""
a = 1
a = b = c
(a, b) = c
a += 1
b //= 3
""")
t = self.ToAST.transform(t)
def test_lists(self):
t = self.parse("""
l0 = [1, 2, [3, 4, [5, []]]]
l1 = [i for i in range(10)]
l1 = [i for i in range(10) if i ** 2 % 3 == 0]
l2 = [ ]
l3 = [ ]
l4 = []
""")
t = self.ToAST.transform(t)
def test_dicts(self):
t = self.parse("""
{1: 2, 2: {1: 3},}
{}
""")
t = self.ToAST.transform(t)
def test_calls(self):
#XXX horrible trees
t = self.parse("""
f(a)(b)(c)
f() ** 2
f(x) * 2
f(x, y, z, *args) + 2
f(x, y, abc=34, *arg, **kwargs)
""")
t = self.ToAST.transform(t)
def test_trailers(self):
py.test.skip("in progress")
t = self.parse("""
(a + b).foo[1 + i - j:](32, *args)
""")
t = self.ToAST.transform(t)
def test_errors(self):
source = """
def f(x):
if a:
pass
else:
pass
else:
pass
"""
excinfo = py.test.raises(ParseError, self.parse, source)
error = excinfo.value.errorinformation
msg = excinfo.value.nice_error_message("<stdin>", source)
def test_precedence(self):
source = """
a = 1 - 2 - 3
"""
t = self.parse(source)
t = self.ToAST.transform(t)
def test_parse_this(self):
filename = __file__
if filename.lower().endswith('.pyc'):
filename = filename[:-1]
s = py.path.local(filename).read()
t = self.parse(s)
t = self.ToAST.transform(t)
def test_parsing(self):
s = py.path.local(__file__).dirpath().dirpath().join("parsing.py").read()
t = self.parse(s)
t = self.ToAST.transform(t)
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