http://local.wasp.uwa.edu.au/~pbourke/geometry/insidepoly/
http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
http://alienryderflex.com/polygon/

Link here:
http://docs.huihoo.com/web/js/es4/core/lexer.html

an informal overview of the ECMAScript 4 lexer