def block(lst, withResult, prepend=None):
if len(lst) == 0:
if withResult:
return ast.Const(None)
else:
return ast.Pass()
def stm(x):
if hasResult(x):
dis = ast.Discard(topy(x))
dis.lineno = getmeta(x, 'lineno')
return dis
else:
return topy(x)
if withResult:
stms = [stm(s) for s in lst[:-1]]
last = lst[-1]
lastpy = topy(last)
if hasResult(last):
# Insert a pass so pycodegen emits a SET_LINENO
p = ast.Pass()
p.lineno = getmeta(last, 'lineno')
statements = stms + [p, lastpy]
else:
statements = stms + [lastpy, ast.Const(None)]
else:
statements = [stm(s) for s in lst]
if prepend:
return ast.Stmt(prepend + statements)
else:
return ast.Stmt(statements)
def bind(self, expr, name):
"""
Generates code for binding a name to a value in the rule's locals dict.
"""
return ast.Stmt([
ast.Assign([ast.Subscript(ast.Name('__locals'),
'OP_ASSIGN',
[ast.Const(name)])],
expr),
ast.Subscript(ast.Name('__locals'),
'OP_APPLY', [ast.Const(name)])])
def apply(self, ruleName, codeName='', *exprs):
"""
Create a call to self.apply(ruleName, *args).
"""
args = [self.compilePythonExpr(codeName, arg) for arg in exprs]
if ruleName == "super":
return ast.CallFunc(ast.Getattr(ast.Name("self"),
"superApply"),
[ast.Const(codeName)] + args,
None, None)
return ast.CallFunc(ast.Getattr(ast.Name("self"),
"apply"),
[ast.Const(ruleName)] + args,
None, None)
def visitConst(self, node):
if isinstance(node.value, str):
try: # If the string is ASCII, return a `str` object
node.value.decode('ascii')
except ValueError: # Otherwise return a `unicode` object
return ast.Const(node.value.decode('utf-8'))
return node
def _return(self, val):
if val is None:
pyval = ast.Const(None)
else:
assertResult(val, "return")
pyval = topy(val)
return ast.Return(pyval)
def compileDeflang(self, name, parentx, body):
assert isinstance(name, Symbol)
if parentx:
assertResult(parentx, "derive language from")
parent = topy(parentx)
else:
parent = logixglobal('langlang')
funcname = "#lang:%s" % name
body = len(body) > 0 and block(body, False).nodes or []
funcbody = ast.Stmt(
body
+ [ast.CallFunc(ast.Getattr(ast.Getattr(ast.Name(str(name)),
'__impl__'),
'addDeflangLocals'),
[ast.CallFunc(ast.Name('locals'), [])])])
res = ast.Stmt([
ast.Assign([compilePlace(Symbol(name))],
ast.CallFunc(logixglobal('defLanguage'),
[ast.Const(str(name)),
parent,
ast.CallFunc(GlobalName("globals"), [])])),
astFunction(funcname, tuple(), tuple(), 0, None, funcbody),
ast.CallFunc(ast.Name(funcname), []),
ast.AssName(funcname, 'OP_DELETE')])
lineno = getmeta(self, 'lineno')
for n in res.nodes:
n.lineno = lineno
res.lineno = lineno
return res
def visitAssert(self, node):
end = Label()
self.visit(node.test)
self.emit('jumpif', end)
self.visit(node.fail or ast.Const(None))
self.emit('assertfail')
self.emit(end)
def Symbol(symbol):
if symbol == data.true:
return ast.Const(True)
elif symbol == data.false:
return ast.Const(False)
elif symbol == data.none:
return ast.Const(None)
elif symbol.namespace == "":
return ast.Name(symbol.name)
else:
debug()
raise CompileError, "can't compile symbol with namespace: %s" % symbol
def flist(obj):
for x in obj: assertResult(x, 'use in flist')
return ast.CallFunc(ast.Getattr(logixglobal('flist'), 'new'),
[ast.List(map(topy, obj.elems)),
ast.Dict([(ast.Const(n), topy(v))
for n,v in obj.items()])])
def compileGetOp(op):
lang = op.__language__
opmodname = op.__language__.__module__
if opmodname == modulename:
langexpr = GlobalName(lang.__impl__.name)
else:
langexpr = ast.Getattr(ast.Subscript(logixglobal('lmodules'),
'OP_APPLY',
[ast.Const(opmodname)]),
lang.__impl__.name)
return ast.Subscript(
ast.Getattr(ast.Getattr(langexpr, '__impl__'), 'operators'),
'OP_APPLY',
[ast.Const(op.__syntax__.token)])
def compileGetops(doc):
fromlang = doc[0]
targetlang = doc.get("lang")
ops = [op.strip() for op in doc[1:]]
if targetlang is None:
raise CompileError("No target language for getops"
"(getops in non-exec parse?)")
assertResult(fromlang, "get operators from")
lineno = getattr(doc, 'lineno', None)
lastdot = targetlang.rfind('.')
if lastdot == -1:
def targetlangexpr():
return GlobalName(targetlang)
else:
assert 0, ("PROBE: Why are we getting ops into an imported language?")
langname = targetlang[lastdot+1:]
langmod = targetlang[:lastdot]
def targetlangexpr():
return ast.Getattr(ast.Subscript(logixglobal('lmodules'),
'OP_APPLY',
[ast.Const(langmod)]),
langname)
if len(ops) == 0:
# get all operators
res = ast.CallFunc(ast.Getattr(ast.Getattr(targetlangexpr(), '__impl__'),
'addAllOperators'),
[topy(fromlang)])
else:
stmts = [ast.CallFunc(ast.Getattr(ast.Getattr(targetlangexpr(), '__impl__'),
'addOp'),
[ast.CallFunc(ast.Getattr(ast.Getattr(topy(fromlang),
"__impl__"),
"getOp"),
[ast.Const(op), ast.Const(False)])])
for op in ops]
for s in stmts: s.lineno = lineno
res = ast.Stmt(stmts)
res.lineno = lineno
return res
def visitAugAssign(self, node):
if isinstance(node.node, ast.Name) and (
not self.locals or node.node.name not in flatten(self.locals)):
name = node.node.name
node.node = ast.Subscript(ast.Name('data'), 'OP_APPLY',
[ast.Const(name)])
node.expr = self.visit(node.expr)
return ast.If(
[(ast.Compare(ast.Const(name),
[('in', ast.Name('data'))]), ast.Stmt([node]))],
ast.Stmt([
ast.Raise(
ast.CallFunc(ast.Name('UndefinedError'),
[ast.Const(name)]), None, None)
]))
else:
return ASTTransformer.visitAugAssign(self, node)
def exactly(self, expr):
"""
Create a call to self.exactly(expr).
"""
return ast.CallFunc(ast.Getattr(ast.Name("self"),
"exactly"),
[ast.Const(expr)],
None, None)
def visitName(self, node):
# If the name refers to a local inside a lambda, list comprehension, or
# generator expression, leave it alone
if node.name not in flatten(self.locals):
# Otherwise, translate the name ref into a context lookup
func_args = [ast.Name('data'), ast.Const(node.name)]
node = ast.CallFunc(ast.Name('_lookup_name'), func_args)
return node
def visitPower(self, node, *args):
walk(node.left, self)
walk(node.right, self)
cnode = ast.CallFunc(ast.Name('pow'), [node.left, node.right], None,
None)
node.left = cnode
# Little hack: instead of trying to turn node into a CallFunc, we just do pow(left, right)**1
node.right = ast.Const(1)
def block(lst, withResult, prepend=None):
if len(lst) == 0:
if withResult:
return ast.Const(None)
else:
return ast.Pass()
def stm(x):
if hasResult(x):
dis = ast.Discard(topy(x))
dis.lineno = getattr(x, 'lineno', None)
return dis
else:
return topy(x)
if withResult:
stms = [stm(s) for s in lst[:-1]]
last = lst[-1]
lastpy = topy(last)
if hasResult(last):
# Insert a pass so pycodegen emits a SET_LINENO
p = ast.Pass()
p.lineno = getattr(last, "lineno", None)
statements = stms + [p, lastpy]
else:
statements = stms + [lastpy, ast.Const(None)]
else:
statements = [stm(s) for s in lst]
# HACK: No lineno info was emitted for "del a[0]" statements
# (insert a Pass to fix that)
s2 = []
for s in statements:
if isinstance(s, ast.Subscript) and s.flags == "OP_DELETE" and hasattr(s, "lineno"):
p = ast.Pass()
p.lineno = s.lineno
s2.append(p)
s2.append(s)
if prepend:
return ast.Stmt(prepend + s2)
else:
return ast.Stmt(s2)
def sequence(self, exprs):
"""
Creates a sequence of exprs, returning the value of the last one.
"""
if len(exprs) > 0:
stmtExprs = [ast.Discard(e) for e in exprs[:-1]] + [exprs[-1]]
return ast.Stmt(stmtExprs)
else:
return ast.Const(None)
def atom_string(self, nodelist):
k = ''
for node in nodelist:
k = k + eval(node[1])
n = ast.Const(k)
if self.__template_type and self.__template_type[-1] == "html":
# change "foo" to _q_htmltext("foo")
n = ast.CallFunc(ast.Name(MARKUP_MANGLED_CLASS), [n])
return n
def quote(obj, depth=1):
assert depth > 0
if isinstance(obj, rootops.quote):
depth += 1
elif isinstance(obj, rootops.escape):
extra = obj.__operands__.get('extra', [])
escapelevel = 1 + len(extra)
if escapelevel > depth:
raise CompileError("invalid quote escape")
elif escapelevel == depth:
if obj.__operands__.hasField('splice'):
raise CompileError("Can't splice here")
elif obj.__operands__.hasField("localmodule"):
return topy(localModuleQuote())
else:
assertResult(obj[0], "insert into quote")
return topy(obj[0])
if isinstance(type(obj), OperatorType):
# {{{ generate code to build the operator
cls = obj.__class__
if cls.__module__ == '%s.rootops' % logixModuleName:
classx = ast.Getattr(logixglobal('rootops'), cls.__name__)
else:
optoken = obj.__class__.__syntax__.token
classx = compileGetOp(obj)
operands = macros.gensym("operands")
return ast.Stmt([ast.Assign([compilePlace(operands)],
quotedArgs(obj.__operands__, depth)),
ast.CallFunc(classx, [],
ast.Getattr(topy(operands), "elems"),
ast.Getattr(topy(operands), "fields"))])
# }}}
elif isinstance(obj, flist):
# {{{ generate code to build the flist
return quotedArgs(obj, depth)
# }}}
elif isinstance(obj, Symbol):
# {{{ generate code to build the symbol
return ast.CallFunc(logixglobal('Symbol'), [ast.Const(obj.asStr())])
# }}}
elif isinstance(obj, (tuple, list, dict)):
# Q: Is this ok?
assert 0, "didn't expect one of those to be quoted"
else:
return topy(obj)
def visitListCompFor(self, node):
self.set_lineno(node)
start = self.newBlock()
anchor = self.newBlock()
self.visit(node.list)
self.visit(ast.Const(0))
self.emit('SET_LINENO', node.lineno)
self.nextBlock(start)
self.emit('FOR_LOOP', anchor)
self.visit(node.assign)
return start, anchor
def compileGetOp(symbol):
lang = language.getLanguage(symbol.namespace)
if lang is None:
debug()
raise CompileError, "not an operator symbol: %s" % symbol
opmodname = lang.__module__
if opmodname == modulename:
langexpr = GlobalName(lang.__impl__.name)
else:
langexpr = ast.Getattr(ast.Subscript(logixglobal('lmodules'),
'OP_APPLY',
[ast.Const(opmodname)]),
lang.__impl__.name)
return ast.Subscript(
ast.Getattr(ast.Getattr(langexpr, '__impl__'), 'operators'),
'OP_APPLY',
[ast.Const(symbol.name)])
def _generate(node):
if node.type == node.TERM:
return ast.Compare(ast.Const(node.value),
[('in', ast.Name('text'))])
elif node.type == node.AND:
return ast.And([_generate(node.left), _generate(node.right)])
elif node.type == node.OR:
return ast.Or([_generate(node.left), _generate(node.right)])
elif node.type == node.NOT:
return ast.Not(_generate(node.left))
elif node.type == node.ATTR:
raise NotImplementedError
def function(self, name, expr):
"""
Create a function of one argument with the given name returning the
given expr.
@param name: The function name.
@param expr: The AST to insert into the function.
"""
fexpr = ast.Stmt([ast.Assign([ast.AssName('__locals', 'OP_ASSIGN')],
ast.Dict([(ast.Const('self'),
ast.Name('self'))])),
ast.Assign([ast.Subscript(ast.Getattr(
ast.Name('self'), 'locals'),
'OP_ASSIGN',
[ast.Const(
name.split('_',1)[1])])],
ast.Name('__locals')),
expr])
f = ast.Lambda(['self'], [], 0, fexpr)
f.filename = self.name
return f
def compilePythonExpr(self, name, expr):
"""
Compile an embedded Python expression.
@param name: The current rule name.
@param expr: The Python expression to compile.
"""
c = python_compile(expr, "<grammar rule %s>" % (name,), "eval")
return ast.Stmt([
ast.CallFunc(ast.Name('eval'),
[ast.Const(c),
ast.Getattr(ast.Name("self"), "globals"),
ast.Name('__locals')])])
def _def(self, name, body, args=None):
flags, argnames, defaults = funcArgs(args)
if len(body) > 0:
bod = block(body, True)
stmts = bod.nodes
if len(stmts) > 1 and isinstance(stmts[0], ast.Pass):
first = 1
else:
first = 0
stmt1 = stmts[first]
if isinstance(stmt1, ast.Const) and isinstance(stmt1.value, str):
doc = stmt1.value
del stmts[:first+1]
if len(stmts) == 0:
bod = ast.Const(None)
else:
doc = None
else:
bod = ast.Const(None)
doc = None
return astFunction(str(name), argnames, defaults, flags, doc, ast.Return(bod))
def compileCodeObjects(filename, codeobjs):
if len(codeobjs) == 0:
stmts = []
else:
stmts = [ast.For(ast.AssName('[--codeobj--]', 'OP_ASSIGN'),
ast.Const(codeobjs),
ast.Stmt([ast.Exec(ast.Name('[--codeobj--]'),
None, None)]),
None),
ast.AssName('[--codeobj--]', 'OP_DELETE')]
module = ast.Module(None, ast.Stmt(stmts))
compiler.misc.set_filename(filename, module)
return pycodegen.ModuleCodeGenerator(module).getCode()
def _if(self, tests, else_=None):
for test in tests:
assertResult(test['test'], "use as if test")
tests = [(el['test'], el['body']) for el in tests]
pytests = []
for t,b in tests:
pyt = topy(t)
pyt.lineno = getattr(t, 'lineno', None)
pytests.append( (pyt, block(b, True)) )
# HACK: For line numbers. Workaround for a test with no metadata
# (e.g. just a symbol)
# TODO: make this work for elifs (it doesn't)
if pytests[0][0].lineno is None:
pytests[0][0].lineno = getattr(self, 'lineno', None)
if else_: else_ = block(else_, True)
return ast.If(pytests, else_ or ast.Const(None))
def visitFor(self, node):
start = self.newBlock()
anchor = self.newBlock()
after = self.newBlock()
self.loops.push(start)
self.set_lineno(node)
self.emit('SETUP_LOOP', after)
self.visit(node.list)
self.visit(ast.Const(0))
self.nextBlock(start)
self.set_lineno(node)
self.emit('FOR_LOOP', anchor)
self.visit(node.assign)
self.visit(node.body)
self.emit('JUMP_ABSOLUTE', start)
self.nextBlock(anchor)
self.emit('POP_BLOCK')
if node.else_:
self.visit(node.else_)
self.loops.pop()
self.nextBlock(after)
def compileGetops(self, fromlang, *ops, **kw):
targetlang = kw.get("lang")
if targetlang is None:
raise CompileError("No target language for getops"
"(getops in non-exec parse?)")
assertResult(fromlang, "get operators from")
lineno = getmeta(self, 'lineno')
lastdot = targetlang.rfind('.')
if lastdot == -1:
targetlangexpr = GlobalName(targetlang)
else:
assert 0, ("PROBE: Why are we getting ops into an imported language?")
langname = targetlang[lastdot+1:]
langmod = targetlang[:lastdot]
targetlangexpr = ast.Getattr(ast.Subscript(logixglobal('lmodules'),
'OP_APPLY',
[ast.Const(langmod)]),
langname)
if len(ops) == 0:
# get all operators
res = ast.CallFunc(ast.Getattr(ast.Getattr(targetlangexpr, '__impl__'),
'addAllOperators'),
[topy(fromlang)])
else:
stmts = [ast.CallFunc(ast.Getattr(ast.Getattr(targetlangexpr, '__impl__'),
'addOp'),
[compileGetOp(op)])
for op in ops]
for s in stmts: s.lineno = lineno
res = ast.Stmt(stmts)
res.lineno = lineno
return res
def _if(self, test, body, elifs=None, _else=None):
assertResult(test, "use as if test")
if elifs:
for el in elifs:
assertResult(el['test'], "use as elif test")
tests = [(test, body)] + [(el['test'], el['body']) for el in elifs]
else:
tests = [(test, body)]
pytests = []
for t,b in tests:
pyt = topy(t)
pyt.lineno = getmeta(t, 'lineno')
pytests.append( (pyt, block(b, True)) )
# HACK: For line numbers. Workaround for a test with no metadata
# (e.g. just a symbol), but this doesn't work for elifs
if pytests[0][0].lineno is None:
pytests[0][0].lineno = getmeta(self, 'lineno')
if _else: _else = block(_else, True)
return ast.If(pytests, _else or ast.Const(None))
