nl_tokens: [ 0 2 * PI ] - > [ - PI / 2 PI / 2 ]
pl_tokens: function ( angle ) { var ret = angle ; if ( angle > Math . PI ) { ret = angle - 1.5 * Math . PI ; ret = angle - 1.5 * Math . PI ; } else { ret = angle - 0.5 * Math . PI ; ret = angle - 0.5 * Math . PI ; } return - <mask> ; }