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from pyparsing import *
class Polyp:
# BuiltinFunction = Keyword("Render")
Point = Literal('.')
e = CaselessLiteral('E')
PlusOrMinus = Literal('+') | Literal('-')
Number = Word(nums)
Integer = Combine( Optional(PlusOrMinus) + Number )
Float = Combine( Integer + Optional( Point + Optional(Number) ) + Optional( e + Integer ) )
String = quotedString
Comment = cppStyleComment
Identifier = Forward()
Identifier << (Word(alphas, alphanums + '_') + ZeroOrMore(':' + Identifier))
Variable = Word(alphas, alphanums + '_')
PrimaryExpr = Forward()
UnaryExpr = Forward()
Expr = Forward()
Expression = Forward()
MathOperator = oneOf("+ - * / % ^ **")
RelationOperator = oneOf("= != < > <= >= <>")
UnaryOperator = oneOf("+ - ! ~")
LogicalOperator = oneOf("& |")
BinaryOperator = RelationOperator | MathOperator
VariableList = delimitedList(Variable)
ExpressionList = delimitedList(Expression)
Operand = Integer | Float | Identifier | String
UnaryExpr << ((UnaryOperator + UnaryExpr)
| PrimaryExpr
| nestedExpr(content=PrimaryExpr)
)
Expr << ( UnaryExpr + ZeroOrMore(BinaryOperator + Expr) )
Expression << (
(
(Expr | nestedExpr(content=Expr) )
+ ZeroOrMore(
LogicalOperator + ( Expr
| nestedExpr(content=Expr)
)
)
) | nestedExpr(content=Expression) )
Call = Identifier + Suppress("(") + ExpressionList + Suppress(")")
ParameterList = delimitedList(Variable)
Parameters = Suppress("(") + Optional(ParameterList) + Suppress(")")
Function = Identifier + Parameters
VariableDeclaration = Optional(Suppress(Keyword("var"))) + VariableList + Suppress(":=") + ExpressionList
FunctionDeclaration = Optional(Suppress(Keyword("def"))) + Function + Suppress(":=") + ( nestedExpr(content=Expression) | Expression)
Declaration = VariableDeclaration | FunctionDeclaration
PrimaryExpr << (Call | Operand)
Statement = Declaration | Call
EndOfStatement = Suppress(";")
Polyps = OneOrMore(Statement + EndOfStatement) + StringEnd()
Polyps.ignore(Comment)
def __init__(self):
self.FunctionDeclaration.setParseAction(self.FunctionRegister)
self.VariableDeclaration.setParseAction(self.VariableRegister)
self.EndOfStatement.setParseAction(self.StatementEnd)
self.Call.setParseAction(self.CallAction)
self.VariableTable = {} # Contains bound variables (lazy evaluation)
self.FunctionTable = {} # Contains defined functions (lazy evaluation :)
self.StatementEnd()
def StatementEnd(self, s = None, loc = None, toks = None):
self.function_registration = False
self.variable_registration = False
def CallAction(self, s, loc, toks):
print "Call to '%s'" % toks[0]
def FunctionRegister(self, s, loc, toks):
print "Registering Function:", toks[0]
self.function_registration = True
FunctionName = toks[0]
FunctionTrace = toks[1:]
self.FunctionTable[FunctionName] = [FunctionTrace]
def VariableRegister(self, s, loc, toks):
print "Registering Variable:", toks[0]
self.variable_registration = True
self.VariableTable[toks[0]] = None
def Identifier(self, s, loc, toks):
if self.function_registration or self.variable_registration:
pass
else:
if not self.VariableTable.has_key(toks[0]):
print "Unresolved variable at ", loc
def Parse(self, string, given_table={}):
self.VariableTable.clear()
self.VariableTable.update(given_table)
self.FunctionTable.clear()
try:
print "Parsing string '%s':" % string
self.Polyps.parseString(string)
except ParseException, E:
print "Polyps: Parse error: ", E
print string
print (" " * E.loc) + "^"
print E.parserElement
return
def ParseFile(self, file, given_table={}):
self.VariableTable.clear()
self.VariableTable.update(given_table)
self.FunctionTable.clear()
try:
print "Parsing file '%s':" % file
self.Polyps.parseFile(file)
except ParseException, E:
print "Polyps: Parse error: ", E
print (" " * E.loc) + "^"
# print
print E.parserElement
return
p = Polyp()
# parse("Foostring := \"Foo\";") # (x < a+s) & (x > a-s) & (y < b+s) & (y > b-s) & (z < c+s) & (z > c-s);")
p.Parse("""Cube(a, b, c, s) := (x < a+s) & (x > a-s) & (y < b+s) & (y > b-s) & (z < c+s) & (z > c-s);""")
# p.Parse("var MyVar := 3;")
p.ParseFile("howdy.polyp")
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