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import sys

from heap import defaultScope, InfiniteLoop, MissingAttr, WrongType
from parser import parse, MissingVar, NotAnExpr, ParseError

def entryPoint(argv):
    if len(argv) < 2:
        print "Usage: rix <file.nix>"
        return 1
    path = argv[1]
    with open(path, "rb") as handle: expr = handle.read()
    try:
        ast = parse(expr)
        print "AST:", ast
        print "Pretty:", ast.pretty()
        obj = ast.compile(defaultScope)
        print "Heap object:", obj
        print "Unevaluated object:", obj.asStr()
        obj = obj.evaluate()
        print "Evaluated object:", obj.asStr()
        return 0
    except ParseError as e:
        print "Error while parsing"
        token = e.token
        print "Unexpected token:", token.gettokentype(), "(%s)" % token.getstr()
        pos = token.getsourcepos()
        if pos is None: print "No position information"
        else: print "Error at line %d, column %d" % (pos.lineno, pos.colno)
        return 1
    except NotAnExpr as e:
        print "Error while compiling"
        print "Input syntax was not an expr, but:", e.cls
        return 1
    except MissingVar as e:
        print "Error while compiling"
        print "Name was missing:", e.name
        return 1
    except InfiniteLoop as e:
        print "Error while executing: infinite loop"
        return 1
    except MissingAttr as e:
        print "Error while executing"
        print "Attr was missing:", e.attr
        return 1
    except WrongType as e:
        print "Error while executing"
        print "Type error:", e.message
        return 1

def target(*args): return entryPoint, None

if __name__ == "__main__": entryPoint(sys.argv)