func Compile(s TokenSource) ([]byte, error) {
compiled := make([]byte, 0, 128)
tok := s.Scan()
for tok != token.ENDOFSCRIPT {
switch tok {
case token.DATA:
compiled = appendPushData(compiled, s.Data())
case token.NUMBER:
n := s.Number()
switch {
case n.Sign() == 0:
compiled = append(compiled, 0x00)
case n.Cmp(cMinus1) == 0:
compiled = append(compiled, 0x4f)
case n.Sign() > 0 && n.Cmp(c16) <= 0:
compiled = append(compiled, byte(80+n.Int64()))
default:
data := scriptint.Encode(n)
compiled = appendPushData(compiled, data)
}
case token.OPERATION:
compiled = append(compiled, byte(s.Op()))
case token.CODESEPARATOR:
compiled = append(compiled, 0xab)
case token.IF:
compiled = append(compiled, 0x63)
case token.NOTIF:
compiled = append(compiled, 0x64)
case token.ELSE:
compiled = append(compiled, 0x67)
case token.ENDIF:
compiled = append(compiled, 0x68)
case token.INVALID:
return nil, errors.New("Invalid Token")
default:
return nil, errors.New("Unknown Token" + tok.String())
}
tok = s.Scan()
}
if s.ErrorCount() != 0 {
return nil, errors.New("TokenSource reported errors")
}
return compiled, nil
}
func (this *Context) PushNumber(n *big.Int) {
this.Push(scriptint.Encode(n))
}