def _TestlistComp(self, p_node, id0):
# type: (PNode, Id_t) -> expr_t
"""
testlist_comp: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )
"""
assert p_node.typ == grammar_nt.testlist_comp
children = p_node.children
n = len(children)
if n > 1 and children[1].typ == grammar_nt.comp_for:
elt = self.Expr(children[0])
comp = self._CompFor(children[1])
if id0 == Id.Op_LParen:
return expr.GeneratorExp(elt, [comp])
if id0 == Id.Op_LBracket:
return expr.ListComp(elt, [comp])
raise AssertionError()
if id0 == Id.Op_LParen:
if len(children) == 1: # parenthesized expression like (x+1) or (x)
return self.Expr(children[0])
# (1,) (1, 2) etc.
if children[1].tok.id == Id.Arith_Comma:
return self._Tuple(children)
raise NotImplementedError('testlist_comp')
if id0 == Id.Op_LBracket:
elts = [] # type: List[expr_t]
for i in xrange(0, n, 2): # skip commas
elts.append(self.Expr(children[i]))
return expr.List(elts, expr_context_e.Store) # unused expr_context_e
raise AssertionError(Id_str(id0))
def atom(self, children):
# type: (List[PNode]) -> expr_t
"""Handles alternatives of 'atom' where there is more than one child."""
id_ = children[0].tok.id
if id_ == Id.Op_LParen:
# atom: '(' [yield_expr|testlist_comp] ')' | ...
return self.Expr(children[1])
if id_ == Id.Op_LBracket:
# atom: ... | '[' [testlist_comp] ']' | ...
if len(children) == 2: # []
return expr.List([], expr_context_e.Store) # unused expr_context_e
p_list = children[1].children # what's between [ and ]
# [x for x in y]
if len(p_list) == 2 and p_list[1].typ == grammar_nt.sync_comp_for:
elt = self.Expr(p_list[0])
# TODO: transform 'for', 'if', etc.
return expr.ListComp(elt, [])
# [1, 2, 3]
n = len(p_list)
elts = []
for i in xrange(0, n, 2): # skip commas
p_node = p_list[i]
elts.append(self.Expr(p_node))
return expr.List(elts, expr_context_e.Store) # unused expr_context_e
raise NotImplementedError
def Expr(self, pnode):
# type: (PNode) -> expr_t
"""Transform expressions (as opposed to statements)."""
typ = pnode.typ
tok = pnode.tok
children = pnode.children
if ISNONTERMINAL(typ):
#
# Oil Entry Points / Additions
#
if typ == grammar_nt.oil_expr: # for if/while
# oil_expr: '(' testlist ')'
return self.Expr(children[1])
if typ == grammar_nt.return_expr:
# return_expr: testlist end_stmt
return self.Expr(children[0])
if typ == grammar_nt.place_list:
return self._AssocBinary(children)
if typ == grammar_nt.place:
# place: NAME place_trailer*
if len(pnode.children) == 1:
return self.Expr(pnode.children[0])
# TODO: Called _Trailer but don't handle ( )?
# only [] . -> :: ?
raise NotImplementedError
#
# Python-like Expressions / Operators
#
if typ == grammar_nt.atom:
if len(children) == 1:
return self.Expr(children[0])
return self._Atom(children)
if typ == grammar_nt.testlist:
# testlist: test (',' test)* [',']
# We need tuples for Python's 'var a, b = x' and 'for (a, b in x) {'
return self._Tuple(children)
if typ == grammar_nt.test:
# test: or_test ['if' or_test 'else' test] | lambdef
if len(children) == 1:
return self.Expr(children[0])
# TODO: Handle lambdef
test = self.Expr(children[2])
body = self.Expr(children[0])
orelse = self.Expr(children[4])
return expr.IfExp(test, body, orelse)
if typ == grammar_nt.test_nocond:
# test_nocond: or_test | lambdef_nocond
assert len(children) == 1
return self.Expr(children[0])
if typ == grammar_nt.argument:
# argument: ( test [comp_for] |
# test '=' test |
# '**' test |
# '*' test )
if len(pnode.children) == 1:
return self.Expr(children[0])
# TODO:
raise NotImplementedError
if typ == grammar_nt.subscript:
# subscript: test | [test] ':' [test] [sliceop]
if len(pnode.children) == 1:
return self.Expr(children[0])
# TODO:
raise NotImplementedError
if typ == grammar_nt.testlist_comp:
# testlist_comp: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )
if children[1].typ == grammar_nt.comp_for:
elt = self.Expr(children[0])
comp = self._CompFor(children[1])
return expr.ListComp(elt, [comp])
# (1,) (1, 2) etc.
if children[1].tok.id == Id.Arith_Comma:
return self._Tuple(children)
raise NotImplementedError('testlist_comp')
elif typ == grammar_nt.exprlist:
# exprlist: (expr|star_expr) (',' (expr|star_expr))* [',']
if len(children) == 1:
return self.Expr(children[0])
# used in for loop, genexpr.
# TODO: This sould be placelist? for x, *y ?
raise NotImplementedError('exprlist')
#
# Operators with Precedence
#
if typ == grammar_nt.or_test:
# or_test: and_test ('or' and_test)*
return self._AssocBinary(children)
if typ == grammar_nt.and_test:
# and_test: not_test ('and' not_test)*
return self._AssocBinary(children)
if typ == grammar_nt.not_test:
# not_test: 'not' not_test | comparison
if len(children) == 1:
return self.Expr(children[0])
op_tok = children[0].tok # not
return expr.Unary(op_tok, self.Expr(children[1]))
elif typ == grammar_nt.comparison:
if len(children) == 1:
return self.Expr(children[0])
return self._CompareChain(children)
elif typ == grammar_nt.expr:
# expr: xor_expr ('|' xor_expr)*
return self._AssocBinary(children)
if typ == grammar_nt.xor_expr:
# xor_expr: and_expr ('xor' and_expr)*
return self._AssocBinary(children)
if typ == grammar_nt.and_expr: # a & b
# and_expr: shift_expr ('&' shift_expr)*
return self._AssocBinary(children)
elif typ == grammar_nt.shift_expr:
# shift_expr: arith_expr (('<<'|'>>') arith_expr)*
return self._AssocBinary(children)
elif typ == grammar_nt.arith_expr:
# arith_expr: term (('+'|'-') term)*
return self._AssocBinary(children)
elif typ == grammar_nt.term:
# term: factor (('*'|'/'|'div'|'mod') factor)*
return self._AssocBinary(children)
elif typ == grammar_nt.factor:
# factor: ('+'|'-'|'~') factor | power
# the power would have already been reduced
if len(children) == 1:
return self.Expr(children[0])
op, e = children
assert isinstance(op.tok, token)
return expr.Unary(op.tok, self.Expr(e))
elif typ == grammar_nt.power:
# power: atom trailer* ['^' factor]
node = self.Expr(children[0])
if len(children) == 1: # No trailers
return node
n = len(children)
i = 1
while i < n and ISNONTERMINAL(children[i].typ):
node = self._Trailer(node, children[i])
i += 1
if i != n: # ['^' factor]
op_tok = children[i].tok
assert op_tok.id == Id.Arith_Caret, op_tok
factor = self.Expr(children[i+1])
node = expr.Binary(op_tok, node, factor)
return node
#
# Oil Lexer Modes
#
elif typ == grammar_nt.array_literal:
left_tok = children[0].tok
# Approximation for now.
tokens = [
pnode.tok for pnode in children[1:-1] if pnode.tok.id ==
Id.Lit_Chars
]
items = [expr.Const(t) for t in tokens] # type: List[expr_t]
return expr.ArrayLiteral(left_tok, items)
elif typ == grammar_nt.sh_array_literal:
left_tok = children[0].tok
# HACK: When typ is Id.Expr_CastedDummy, the 'tok' field ('opaque')
# actually has a list of words!
typ1 = children[1].typ
assert typ1 == Id.Expr_CastedDummy.enum_id, typ1
array_words = cast('List[word_t]', children[1].tok)
return sh_array_literal(left_tok, array_words)
elif typ == grammar_nt.sh_command_sub:
return cast(command_sub, children[1].tok)
elif typ == grammar_nt.braced_var_sub:
return cast(braced_var_sub, children[1].tok)
elif typ == grammar_nt.dq_string:
return cast(double_quoted, children[1].tok)
elif typ == grammar_nt.sq_string:
return cast(single_quoted, children[1].tok)
elif typ == grammar_nt.simple_var_sub:
return simple_var_sub(children[0].tok)
else:
nt_name = self.number2symbol[typ]
raise AssertionError(
"PNode type %d (%s) wasn't handled" % (typ, nt_name))
else: # Terminals should have a token
id_ = tok.id
if id_ == Id.Expr_Name:
return expr.Var(tok)
if id_ in (
Id.Expr_DecInt, Id.Expr_BinInt, Id.Expr_OctInt, Id.Expr_HexInt,
Id.Expr_Float):
return expr.Const(tok)
if id_ in (Id.Expr_Null, Id.Expr_True, Id.Expr_False):
return expr.Const(tok)
from core.meta import IdInstance
raise NotImplementedError(IdInstance(typ))
