def calcFreeVars(self):
premVars = sum(map(lambda p: p.vars(), self.premises), [])
concVars = sum(map(lambda c: c.vars(), self.conclusion), [])
self.free = []
for v in premVars:
if util.interestingRoot(v) and v not in concVars and v not in self.free:
self.free.append(v)
self.freeConc = []
for v in concVars:
if util.interestingRoot(v) and v not in premVars and v not in self.freeConc:
self.freeConc.append(v)
def freshOld(self, clone):
if not util.interestingRoot(clone):
return clone
if isinstance(clone, symbol.Id):
result = symbol.FreshId(clone.symbol, self.getFreshNum(clone.name))
result.name = clone.name
return result
elif isinstance(clone, symbol.List):
result = symbol.List(None)
result.arg = self.freshOld(clone.arg)
return result
elif isinstance(clone, symbol.Symbol):
return symbol.FreshId(clone, self.getFreshNum(clone.shortString()))
elif isinstance(clone, symbol.Seq):
result = symbol.Seq(None)
result.syntax = map(lambda x: self.freshOld(x), clone.syntax)
return result
else:
print "Error: can't clone " + str(clone)
return symbol.ErrSym()
def freshOld(self, clone):
if not util.interestingRoot(clone):
return clone
if isinstance(clone, symbol.Id):
result = symbol.FreshId(clone.symbol, self.getFreshNum(clone.name))
result.name = clone.name
return result
elif isinstance(clone, symbol.List):
result = symbol.List(None)
result.arg = self.freshOld(clone.arg)
return result
elif isinstance(clone, symbol.Symbol):
return symbol.FreshId(clone, self.getFreshNum(clone.shortString()))
elif isinstance(clone, symbol.Seq):
result = symbol.Seq(None)
result.syntax = map(lambda x: self.freshOld(x), clone.syntax)
return result
else:
print "Error: can't clone " + str(clone)
return symbol.ErrSym()
def fresh(self, clone, listDepth = 0):
if not util.interestingRoot(clone):
return clone
if isinstance(clone, symbol.Id):
result = symbol.Id(None, clone.symbol)
result.name = clone.name
result = self.makeFresh(result, listDepth)
elif isinstance(clone, symbol.Symbol):
result = self.makeFresh(symbol.Id(None, clone), listDepth)
elif isinstance(clone, symbol.List):
result = symbol.List(None)
result.arg = self.fresh(clone.arg, listDepth + 1)
elif isinstance(clone, symbol.Seq):
result = symbol.Seq(None)
result.syntax = map(lambda x: self.fresh(x, listDepth), clone.syntax)
else:
print "Error: can't clone " + str(clone)
return symbol.ErrSym()
if listDepth == 0:
self.regVars.add(result)
return result
def fresh(self, clone, listDepth=0):
if not util.interestingRoot(clone):
return clone
if isinstance(clone, symbol.Id):
result = symbol.Id(None, clone.symbol)
result.name = clone.name
result = self.makeFresh(result, listDepth)
elif isinstance(clone, symbol.Symbol):
result = self.makeFresh(symbol.Id(None, clone), listDepth)
elif isinstance(clone, symbol.List):
result = symbol.List(None)
result.arg = self.fresh(clone.arg, listDepth + 1)
elif isinstance(clone, symbol.Seq):
result = symbol.Seq(None)
result.syntax = map(lambda x: self.fresh(x, listDepth),
clone.syntax)
else:
print "Error: can't clone " + str(clone)
return symbol.ErrSym()
if listDepth == 0:
self.regVars.add(result)
return result
def invertArg(self, arg, envr, pm):
arg = self.resolveOrDont(arg)
if not isinstance(arg, judge.Judge) or arg.nt:
raise ProofError("Argument to " + self.command + " must be a positive judgement, found: " + arg.shortString())
#if any of the parts of arg are not atomic, we will need to use proxy variables
proxy = judge.Judge(None)
pMatches = []
proxy.defn = arg.defn
proxy.nt = False
trackFresh = set()
def proxify(x):
if util.isAtomic(x):
return x
else:
fresh = envr.fresh(x.type(pm.world.symList))
trackFresh.add(fresh)
pMatches.append(x.isSuperType(fresh, pm.world.symList))
return fresh
proxy.envs = map(proxify, arg.envs)
proxy.args = map(proxify, arg.args)
#find the cases that match syntactically
cases = []
matches2 = [] #matches formals to fresh variables
matches = [] #matches fresh variables to actuals
for c in proxy.defn.cases:
m2 = symbol.SeqMatch(None)
for source in set(c.getConclusions()[0].vars()):
for v in source.vars():
if util.interestingRoot(v):
m2.addIdMatch(v, envr.fresh(v))
m = proxy.unify(c.getConclusions()[0].substMatch([m2]), pm.world.symList)
if m:
cases.append(c)
m.substMatch(pMatches)
matches.append(m)
matches2.append(m2)
#if no cases, then we have a contradiction and the result is false
if not cases:
return None
#use fresh variables for fv
for c,m in zip(cases, matches2):
for f in c.free:
m.addIdMatch(f, envr.fresh(f))
#find the premises of those cases, subst variables deduced from conc
prems = map(lambda (c,m,m2): map(lambda p: p.substMatch([m2]).substMatch([m]), c.premises), zip(cases, matches, matches2))
for (p, m, m2) in zip(prems, matches, matches2):
for source in set(m.dom()):
#account for equalities between actuals and formals of the conclusion/arg
if not util.isAtomic(source):
pe = judge.Equality(None)
pe.lhs = m.match(source)
pe.rhs = source.substMatch([m2]).substMatch([m])
pe.nt = False
p.insert(0, pe)
#account for where refinements of actuals would otherwise be lost
elif not source.substMatch([m]).isSuperType(source, pm.world.symList):
#revert the premises to using the more refined variable
for i in range(len(p)):
p[i] = p[i].substMatch([symbol.IdMatch(m.match(source), source.substMatch([m2]))])
#add an equality which captures the refinement
pe = judge.Equality(None)
pe.lhs = m.match(source)
pe.rhs = source.substMatch([m2])
pe.nt = False
p.insert(0, pe)
return prems,cases
def checkJCase(self, ast, parent, index):
result = JCase(ast)
result.parent = parent
if ast.label:
result.label = ast.label
else:
result.label = parent.name + str(index)
result.name = result.label
#store the shape as a mapping from the parent envs/args to the case ones
#check the shape matches the parent shape
if len(ast.val.envs) != len(parent.envs):
self.addErr("Incorrect number of environments in case " + result.label + " of " + parent.name, ast.val)
result.envs = []
else:
m = map(lambda (x, p): self.checkShapeElement(x, p), zip(ast.val.envs, parent.envLabels))
result.envs, result.envMatches = ([ a for a,b in m ], [ b for a,b in m ])
if len(ast.val.children) != len(parent.args):
self.addErr("Incorrect number of arguments in case " + result.label + " of " + parent.name, ast.val)
result.args = []
else:
m = map(lambda (x, p): self.checkShapeElement(x, p), zip(ast.val.children, parent.argLabels))
result.args, result.argMatches = ([ a for a,b in m ], [ b for a,b in m ])
vars = [] #collect all vars in the premises
#rename non-unique variables and add corresponding equality constraints
names = dict()
curEnv = env.Env()
for i in range(len(result.envs)):
e = result.envs[i]
if e in names and e.vars():
result.envs[i] = curEnv.freshOld(e)
result.envMatches[i] = result.envs[i].isSuperType(parent.envLabels[i], self.world.symList)
p = judge.Equality(None)
p.nt = False
p.lhs = e
p.rhs = result.envs[i]
vars.append(p.lhs)
vars.append(p.rhs)
result.premises.append(p)
else:
names[e] = e
for i in range(len(result.args)):
a = result.args[i]
if a in names and a.vars():
result.args[i] = curEnv.freshOld(a)
result.argMatches[i] = result.args[i].isSuperType(parent.argLabels[i], self.world.symList)
p = judge.Equality(None)
p.nt = False
p.lhs = a
p.rhs = result.args[i]
vars.append(p.lhs)
vars.append(p.rhs)
result.premises.append(p)
else:
names[a] = a
#store and check the premises
for p in ast.children:
sp = self.checkPremise(p)
if sp:
result.premises.append(sp)
vars.extend(sp.vars())
#collect together vars bound in the conclusion
bound = []
bound.extend(filter(lambda x: util.interestingRoot(x), sum(map(lambda x: x.vars(), result.envs), [])))
bound.extend(filter(lambda x: util.interestingRoot(x), sum(map(lambda x: x.vars(), result.args), [])))
result.bound = []
result.globals = []
result.freeConc = []
for b in bound:
if b not in result.bound:
result.bound.append(b)
#check if they are bound in the premises
if util.interestingRoot(b) and b not in vars and b not in result.freeConc:
result.freeConc.append(b)
elif self.globalRoot(b) and b not in result.globals:
result.globals.append(b)
#compute the free vars (variables that are used in the premises, but not the conc)
result.free = []
for b in vars:
if util.interestingRoot(b) and b not in result.free and b not in result.bound:
result.free.append(b)
elif self.globalRoot(b) and b not in result.globals:
result.globals.append(b)
parent.cases.append(result)
if result.label in self.world.jCases:
self.addErr("Case " + result.label + " already defined", ast)
else:
self.world.jCases[result.label] = result
def checkJCase(self, ast, parent, index):
result = JCase(ast)
result.parent = parent
if ast.label:
result.label = ast.label
else:
result.label = parent.name + str(index)
result.name = result.label
#store the shape as a mapping from the parent envs/args to the case ones
#check the shape matches the parent shape
if len(ast.val.envs) != len(parent.envs):
self.addErr(
"Incorrect number of environments in case " + result.label +
" of " + parent.name, ast.val)
result.envs = []
else:
m = map(lambda (x, p): self.checkShapeElement(x, p),
zip(ast.val.envs, parent.envLabels))
result.envs, result.envMatches = ([a for a, b in m],
[b for a, b in m])
if len(ast.val.children) != len(parent.args):
self.addErr(
"Incorrect number of arguments in case " + result.label +
" of " + parent.name, ast.val)
result.args = []
else:
m = map(lambda (x, p): self.checkShapeElement(x, p),
zip(ast.val.children, parent.argLabels))
result.args, result.argMatches = ([a for a, b in m],
[b for a, b in m])
vars = [] #collect all vars in the premises
#rename non-unique variables and add corresponding equality constraints
names = dict()
curEnv = env.Env()
for i in range(len(result.envs)):
e = result.envs[i]
if e in names and e.vars():
result.envs[i] = curEnv.freshOld(e)
result.envMatches[i] = result.envs[i].isSuperType(
parent.envLabels[i], self.world.symList)
p = judge.Equality(None)
p.nt = False
p.lhs = e
p.rhs = result.envs[i]
vars.append(p.lhs)
vars.append(p.rhs)
result.premises.append(p)
else:
names[e] = e
for i in range(len(result.args)):
a = result.args[i]
if a in names and a.vars():
result.args[i] = curEnv.freshOld(a)
result.argMatches[i] = result.args[i].isSuperType(
parent.argLabels[i], self.world.symList)
p = judge.Equality(None)
p.nt = False
p.lhs = a
p.rhs = result.args[i]
vars.append(p.lhs)
vars.append(p.rhs)
result.premises.append(p)
else:
names[a] = a
#store and check the premises
for p in ast.children:
sp = self.checkPremise(p)
if sp:
result.premises.append(sp)
vars.extend(sp.vars())
#collect together vars bound in the conclusion
bound = []
bound.extend(
filter(lambda x: util.interestingRoot(x),
sum(map(lambda x: x.vars(), result.envs), [])))
bound.extend(
filter(lambda x: util.interestingRoot(x),
sum(map(lambda x: x.vars(), result.args), [])))
result.bound = []
result.globals = []
result.freeConc = []
for b in bound:
if b not in result.bound:
result.bound.append(b)
#check if they are bound in the premises
if util.interestingRoot(
b) and b not in vars and b not in result.freeConc:
result.freeConc.append(b)
elif self.globalRoot(b) and b not in result.globals:
result.globals.append(b)
#compute the free vars (variables that are used in the premises, but not the conc)
result.free = []
for b in vars:
if util.interestingRoot(
b) and b not in result.free and b not in result.bound:
result.free.append(b)
elif self.globalRoot(b) and b not in result.globals:
result.globals.append(b)
parent.cases.append(result)
if result.label in self.world.jCases:
self.addErr("Case " + result.label + " already defined", ast)
else:
self.world.jCases[result.label] = result
