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skeleton.py
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skeleton.py
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"""
skeleton.py: The compiler pipeline.
"""
from __future__ import print_function
import cStringIO
from .compiler2 import future
from .compiler2 import pyassem
from .compiler2 import pycodegen
from .compiler2 import syntax
from .compiler2 import symbols
from .compiler2 import transformer
from pgen2 import tokenize
from pgen2 import driver
from pgen2 import parse
def _PrintScopes(scopes):
# This is already flattened out.
for node, scope in scopes.iteritems():
scope.PrettyPrint()
print()
#for c in scope.children:
# print(c)
class _ModuleContext(object):
"""Module-level data for the CodeGenerator tree."""
def __init__(self, filename, comp_opt, scopes, futures=()):
self.filename = filename
self.comp_opt = comp_opt # copmilation options
self.scopes = scopes
self.futures = futures
def _ParseTreeToTuples(pnode):
"""
parser.st objects from parsermodule.c have a totuple() method, which outputs
tuples like this. The original "compiler2" module expected this format, but
the original pgen2 produced a different format.
"""
if pnode.tok:
value, _, (lineno, column) = pnode.tok # opaque
else:
value = None
lineno = 0
column = 0
if pnode.children:
return (pnode.typ,) + tuple(_ParseTreeToTuples(p) for p in pnode.children)
else:
return (pnode.typ, value, lineno, column)
class StringInput(object):
"""A wrapper for a StringIO object .
It follows Python's convention of having an f.name attribute.
"""
def __init__(self, s, name):
self.f = cStringIO.StringIO(s)
self.name = name
def read(self, *args):
return self.f.read(*args)
def readline(self, *args):
return self.f.readline(*args)
def close(self):
return self.f.close()
class ParseMode(object):
"""A shortcut."""
def __init__(self, gr, start_symbol):
self.gr = gr
self.start_symbol = start_symbol
class Compiler(object):
def __init__(self, gr):
self.gr = gr
def Compile(self, f, opt, *args, **kwargs):
# TODO: inline this call
return Compile(f, opt, self.gr, *args, **kwargs)
def Compile(f, opt, gr, mode, print_action=None):
"""Run the full compiler pipeline.
Args:
f: file handle with input source code
opt: Parsed command line flags
gr: Grammar
start_symbol: name of the grammar start symbol
mode: 'exec', 'eval', or 'single', like Python's builtin compile()
print_action: 'ast' or 'cfg'. Print an intermediate representation.
opt: Command line flags
"""
filename = f.name
tokens = tokenize.generate_tokens(f.readline)
p = parse.Parser(gr)
if mode == 'single':
start_symbol = 'single_input'
elif mode == 'exec':
start_symbol = 'file_input'
elif mode == 'eval':
start_symbol = 'eval_input'
parse_tree = driver.PushTokens(p, tokens, gr, start_symbol)
parse_tuples = _ParseTreeToTuples(parse_tree)
tr = transformer.Transformer()
as_tree = tr.transform(parse_tuples)
if print_action == 'ast':
print(as_tree)
return
# NOTE: This currently does nothing!
v = syntax.SyntaxErrorChecker()
v.Dispatch(as_tree)
s = symbols.SymbolVisitor()
s.Dispatch(as_tree)
if print_action == 'symbols':
_PrintScopes(s.scopes)
return
graph = pyassem.FlowGraph() # Mutated by code generator
if mode == "single": # Not used now?
ctx = _ModuleContext(filename, opt, s.scopes)
# NOTE: the name of the Frame is a comment, not exposed to users.
frame = pyassem.Frame("<interactive>", filename) # mutated
gen = pycodegen.InteractiveCodeGenerator(ctx, frame, graph)
gen.set_lineno(as_tree)
elif mode == "exec":
# TODO: Does this need to be made more efficient?
p1 = future.FutureParser()
p2 = future.BadFutureParser()
p1.Dispatch(as_tree)
p2.Dispatch(as_tree)
ctx = _ModuleContext(filename, opt, s.scopes, futures=p1.get_features())
frame = pyassem.Frame("<module>", filename) # mutated
gen = pycodegen.TopLevelCodeGenerator(ctx, frame, graph)
elif mode == "eval":
ctx = _ModuleContext(filename, opt, s.scopes)
frame = pyassem.Frame("<expression>", filename) # mutated
gen = pycodegen.TopLevelCodeGenerator(ctx, frame, graph)
else:
raise AssertionError('Invalid mode %r' % mode)
# NOTE: There is no Start() or FindLocals() at the top level.
gen.Dispatch(as_tree) # mutates graph
gen.Finish()
if print_action == 'cfg':
print(graph)
return
co = pyassem.MakeCodeObject(frame, graph, opt)
# NOTE: Could call marshal.dump here?
return co