Split ASTTypedRewriter off Inferencer.

This commit is contained in:
whitequark 2015-06-13 11:03:33 +03:00
parent 61434a8da3
commit 4c95647162
1 changed files with 101 additions and 108 deletions

View File

@ -126,61 +126,10 @@ class LocalExtractor(algorithm.Visitor):
self.visit(stmt)
class Inferencer(algorithm.Transformer):
class ASTTypedRewriter(algorithm.Transformer):
def __init__(self, engine):
self.engine = engine
self.env_stack = []
self.function = None # currently visited function
def _unify(self, typea, typeb, loca, locb, makenotes=None):
try:
typea.unify(typeb)
except types.UnificationError as e:
printer = types.TypePrinter()
if makenotes:
notes = makenotes(printer, typea, typeb, loca, locb)
else:
notes = [
diagnostic.Diagnostic("note",
"expression of type {typea}",
{"typea": printer.name(typea)},
loca),
diagnostic.Diagnostic("note",
"expression of type {typeb}",
{"typeb": printer.name(typeb)},
locb)
]
highlights = [locb] if locb else []
if e.typea.find() == typea.find() and e.typeb.find() == typeb.find():
diag = diagnostic.Diagnostic("error",
"cannot unify {typea} with {typeb}",
{"typea": printer.name(typea), "typeb": printer.name(typeb)},
loca, highlights, notes)
else: # give more detail
diag = diagnostic.Diagnostic("error",
"cannot unify {typea} with {typeb}: {fraga} is incompatible with {fragb}",
{"typea": printer.name(typea), "typeb": printer.name(typeb),
"fraga": printer.name(e.typea), "fragb": printer.name(e.typeb)},
loca, highlights, notes)
self.engine.process(diag)
# makenotes for the case where types of multiple elements are unified
# with the type of parent expression
def _makenotes_elts(self, elts, kind):
def makenotes(printer, typea, typeb, loca, locb):
return [
diagnostic.Diagnostic("note",
"{kind} of type {typea}",
{"kind": kind, "typea": printer.name(elts[0].type)},
elts[0].loc),
diagnostic.Diagnostic("note",
"{kind} of type {typeb}",
{"kind": kind, "typeb": printer.name(typeb)},
locb)
]
return makenotes
def _find_name(self, name, loc):
for typing_env in reversed(self.env_stack):
@ -199,7 +148,12 @@ class Inferencer(algorithm.Transformer):
node = asttyped.ModuleT(
typing_env=extractor.typing_env, globals_in_scope=extractor.global_,
body=node.body, loc=node.loc)
return self.visit(node)
try:
self.env_stack.append(node.typing_env)
return self.generic_visit(node)
finally:
self.env_stack.pop()
def visit_FunctionDef(self, node):
extractor = LocalExtractor(env_stack=self.env_stack, engine=self.engine)
@ -213,7 +167,12 @@ class Inferencer(algorithm.Transformer):
keyword_loc=node.keyword_loc, name_loc=node.name_loc,
arrow_loc=node.arrow_loc, colon_loc=node.colon_loc, at_locs=node.at_locs,
loc=node.loc)
return self.visit(node)
try:
self.env_stack.append(node.typing_env)
return self.generic_visit(node)
finally:
self.env_stack.pop()
def visit_arg(self, node):
return asttyped.argT(type=self._find_name(node.arg, node.loc),
@ -297,31 +256,107 @@ class Inferencer(algorithm.Transformer):
loc=node.loc)
return self.visit(node)
# Visitors that just unify types
# Unsupported visitors
#
def visit_unsupported(self, node):
diag = diagnostic.Diagnostic("fatal",
"this syntax is not supported", {},
node.loc)
self.engine.process(diag)
# expr
visit_Attribute = visit_unsupported
visit_BinOp = visit_unsupported
visit_Call = visit_unsupported
visit_Compare = visit_unsupported
visit_Dict = visit_unsupported
visit_DictComp = visit_unsupported
visit_Ellipsis = visit_unsupported
visit_GeneratorExp = visit_unsupported
visit_Lambda = visit_unsupported
visit_ListComp = visit_unsupported
visit_Set = visit_unsupported
visit_SetComp = visit_unsupported
visit_Str = visit_unsupported
visit_Starred = visit_unsupported
visit_Yield = visit_unsupported
visit_YieldFrom = visit_unsupported
class Inferencer(algorithm.Visitor):
def __init__(self, engine):
self.engine = engine
# currently visited function, for Return inference
self.function = None
def _unify(self, typea, typeb, loca, locb, makenotes=None):
try:
typea.unify(typeb)
except types.UnificationError as e:
printer = types.TypePrinter()
if makenotes:
notes = makenotes(printer, typea, typeb, loca, locb)
else:
notes = [
diagnostic.Diagnostic("note",
"expression of type {typea}",
{"typea": printer.name(typea)},
loca),
diagnostic.Diagnostic("note",
"expression of type {typeb}",
{"typeb": printer.name(typeb)},
locb)
]
highlights = [locb] if locb else []
if e.typea.find() == typea.find() and e.typeb.find() == typeb.find():
diag = diagnostic.Diagnostic("error",
"cannot unify {typea} with {typeb}",
{"typea": printer.name(typea), "typeb": printer.name(typeb)},
loca, highlights, notes)
else: # give more detail
diag = diagnostic.Diagnostic("error",
"cannot unify {typea} with {typeb}: {fraga} is incompatible with {fragb}",
{"typea": printer.name(typea), "typeb": printer.name(typeb),
"fraga": printer.name(e.typea), "fragb": printer.name(e.typeb)},
loca, highlights, notes)
self.engine.process(diag)
# makenotes for the case where types of multiple elements are unified
# with the type of parent expression
def _makenotes_elts(self, elts, kind):
def makenotes(printer, typea, typeb, loca, locb):
return [
diagnostic.Diagnostic("note",
"{kind} of type {typea}",
{"kind": kind, "typea": printer.name(elts[0].type)},
elts[0].loc),
diagnostic.Diagnostic("note",
"{kind} of type {typeb}",
{"kind": kind, "typeb": printer.name(typeb)},
locb)
]
return makenotes
def visit_ListT(self, node):
for elt in node.elts:
self._unify(node.type["elt"], elt.type,
node.loc, elt.loc, self._makenotes_elts(node.elts, "a list element"))
return node
def visit_SubscriptT(self, node):
# TODO: support more than just lists
self._unify(builtins.TList(node.type), node.value.type,
node.loc, node.value.loc)
return node
def visit_IfExpT(self, node):
self._unify(node.body.type, node.orelse.type,
node.body.loc, node.orelse.loc)
node.type = node.body.type
return node
def visit_BoolOpT(self, node):
for value in node.values:
self._unify(node.type, value.type,
node.loc, value.loc, self._makenotes_elts(node.values, "an operand"))
return node
def visit_UnaryOpT(self, node):
if isinstance(node.op, ast.Not):
@ -336,53 +371,34 @@ class Inferencer(algorithm.Transformer):
{"type": types.TypePrinter().name(operand_type)},
node.operand.loc)
self.engine.process(diag)
return node
def visit_ModuleT(self, node):
self.env_stack.append(node.typing_env)
node = self.generic_visit(node)
self.env_stack.pop()
return node
def visit_FunctionDefT(self, node):
self.env_stack.append(node.typing_env)
old_function, self.function = self.function, node
node = self.generic_visit(node)
self.function = old_function
self.env_stack.pop()
return node
def visit_Assign(self, node):
node = self.generic_visit(node)
self.generic_visit(node)
if len(node.targets) > 1:
self._unify(builtins.TTuple([x.type for x in node.targets]), node.value.type,
node.targets[0].loc.join(node.targets[-1].loc), node.value.loc)
else:
self._unify(node.targets[0].type, node.value.type,
node.targets[0].loc, node.value.loc)
return node
def visit_AugAssign(self, node):
node = self.generic_visit(node)
self.generic_visit(node)
self._unify(node.target.type, node.value.type,
node.target.loc, node.value.loc)
return node
def visit_For(self, node):
node = self.generic_visit(node)
self.generic_visit(node)
# TODO: support more than just lists
self._unify(builtins.TList(node.target.type), node.iter.type,
node.target.loc, node.iter.loc)
return node
def visit_Return(self, node):
node = self.generic_visit(node)
self.generic_visit(node)
def makenotes(printer, typea, typeb, loca, locb):
return [
diagnostic.Diagnostic("note",
@ -401,31 +417,6 @@ class Inferencer(algorithm.Transformer):
self._unify(self.function.return_type, node.value.type,
self.function.name_loc, node.value.loc, makenotes)
# Unsupported visitors
#
def visit_unsupported(self, node):
diag = diagnostic.Diagnostic("fatal",
"this syntax is not supported", {},
node.loc)
self.engine.process(diag)
visit_Attribute = visit_unsupported
visit_BinOp = visit_unsupported
visit_Call = visit_unsupported
visit_Compare = visit_unsupported
visit_Dict = visit_unsupported
visit_DictComp = visit_unsupported
visit_Ellipsis = visit_unsupported
visit_GeneratorExp = visit_unsupported
visit_Lambda = visit_unsupported
visit_ListComp = visit_unsupported
visit_Set = visit_unsupported
visit_SetComp = visit_unsupported
visit_Str = visit_unsupported
visit_Starred = visit_unsupported
visit_Yield = visit_unsupported
visit_YieldFrom = visit_unsupported
class Printer(algorithm.Visitor):
def __init__(self, buf):
self.rewriter = source.Rewriter(buf)
@ -467,7 +458,9 @@ def main():
buf = source.Buffer("".join(fileinput.input()), os.path.basename(fileinput.filename()))
parsed, comments = parse_buffer(buf, engine=engine)
typed = Inferencer(engine=engine).visit(parsed)
typed = ASTTypedRewriter(engine=engine).visit(parsed)
Inferencer(engine=engine).visit(typed)
printer = Printer(buf)
printer.visit(typed)
for comment in comments: