558.016.  Extended terms for prior criminal conduct — definitions — sentencing. — 1.  The court may sentence a person who has been found guilty of an offense to a term of imprisonment as authorized by section 558.011 or to a term of imprisonment authorized by a statute governing the offense if it finds the defendant is a prior offender or a persistent misdemeanor offender.  The court may sentence a person to an extended term of imprisonment if:

  (1)  The defendant is a persistent offender or a dangerous offender, and the person is sentenced under subsection 7 of this section;

  (2)  The statute under which the person was found guilty contains a sentencing enhancement provision that is based on a prior finding of guilt or a finding of prior criminal conduct and the person is sentenced according to the statute; or

  (3)  A more specific sentencing enhancement provision applies that is based on a prior finding of guilt or a finding of prior criminal conduct.

  2.  A "prior offender" is one who has been found guilty of one felony.

  3.  A "persistent offender" is one who has been found guilty of two or more felonies committed at different times, or one who has been previously found guilty of a dangerous felony as defined in subdivision (19) of section 556.061.

  4.  A "dangerous offender" is one who:

  (1)  Is being sentenced for a felony during the commission of which he knowingly murdered or endangered or threatened the life of another person or knowingly inflicted or attempted or threatened to inflict serious physical injury on another person; and

  (2)  Has been found guilty of a class A or B felony or a dangerous felony.

  5.  A "persistent misdemeanor offender" is one who has been found guilty of two or more offenses, committed at different times that are classified as A or B misdemeanors under the laws of this state.

  6.  The findings of guilt shall be prior to the date of commission of the present offense.

  7.  The court shall sentence a person, who has been found to be a persistent offender or a dangerous offender, and is found guilty of a class B, C, D, or E felony to the authorized term of imprisonment for the offense that is one class higher than the offense for which the person is found guilty.