java - String manipulation for VML Path -

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hi trying parse vml path value using java string manipulation. want retreive commands in path moveto, lineto, curveto, rlineto (other commands) , corresponding x , y coordinates/parameters.

here example data parse, each command has own x,y coordinates.

 1. m1,1 l1,200,200,200,200,1 xe  2. m, l1,200,200,200,200,1 xe

can suggest algorithm or code on retreiving commands , parameters each command? example in number 1.

command = moveto 'm'  command parameters = (x=1,y=1).

ref: http://www.w3.org/tr/note-vml#_toc416858391

this weird tried using stringtokenizer 

stringtokenizer tokenizer = new stringtokenizer(path);

a friend suggested using stringtokenizer , did near goal, gave me following data. maybe can utilize stringtokenizer suit needs.

m1,1 l1,200,200,200,200,1 xe

for #1, here ideal output. (pseudocode)

string command_type = "m"        list<string, string> parameters =   add("1", "1") string command_type = "l"        list<string, string> parameters =   add("1", "200")                                                                      add("200", "200")                                                                      add("200", "1") string command_type = "x"        (can have no parameter ) string command_type = "e"        (can have no parameter )

for #2, here ideal output. (pseudocode)

string command_type = "m"        list<string, string> parameters =   add("0", "0")  // because x , y parameters not specified need force them 0,0 string command_type = "l"        list<string, string> parameters =   add("1", "200")                                                                      add("200", "200")                                                                      add("200", "1") string command_type = "x"        (can have no parameter ) string command_type = "e"        (can have no parameter )

a spec important here based on sample input , output have guessed:

letter -> comma separated parameters -> letter -> comma separated parameters

i have noted commands not separated spaces. e.g. have xe 2 separate commands. means in sample spaces have no meaning , can ignored.

i note commands single letters. (otherwise xe wouldn’t come 2 commands)

also parameters must come in pairs , must numbers. see no negative numbers in sample assume these possible. assume integers , not decimals.

so based on assumed spec can come possible solution have through , work out doing.

package ic.ac.uk.relationshipvisualiser.app;  import java.util.arraylist; import java.util.list;  public class tmpnofxtest {      private static class coord {         int x = 0;         int y = 0;         public coord(int p_x,int p_y) {             x=p_x;y=p_y;         }         public int getx() {return x;}         public int gety() {return y;}     }     private static class command {         string command = "";         list<coord> param_list = new arraylist<coord>();          public command(string p_command) {             command = p_command;         }         private string parseoneparam(string p_inp) {             if (p_inp.equals("")) return "";             if (isletter(p_inp.substring(0,1))) return p_inp;             int firstchar = 0;             (int c=0;c<p_inp.length();c++) {                 if (firstchar==0) {                     if (isletter(p_inp.substring(c,c+1))) {                         firstchar = c;                     }                 }             }              string parms = p_inp.substring(0,firstchar);             if (parms.length()==0) return p_inp.substring(firstchar);             int x = 0;             int y = 0;              int p = 0;             string tmp = "";             while ((p<parms.length()) && (!parms.substring(p,p+1).equals(","))) {                 tmp = tmp + parms.substring(p,p+1);                 p++;             }             p++;             if (tmp.length()>0) {                 x = integer.parseint(tmp);             }              tmp = "";             while ((p<parms.length()) && (!parms.substring(p,p+1).equals(","))) {                 tmp = tmp + parms.substring(p,p+1);                 p++;             }              if (p_inp.substring(p,p+1)==",") p++;              if (tmp.length()>0) {                 y = integer.parseint(tmp);             }              param_list.add(new coord(x,y));              return p_inp.substring(p);         }         public string parseparams(string p_inp) {             if (p_inp.equals("")) return "";             while (!isletter(p_inp)) {                 p_inp = parseoneparam(p_inp);             }             return p_inp;         }         public string tostring() {             string ret = "";             ret = "string command_type = \"" + command + "\"";             if (param_list.size()==0) return ret + "     (can have no parameter )";               (int c=0;c<param_list.size();c++) {                 if (c>0) ret += "\n                         ";                 ret += "        list<string, string> parameters =   add(\"" + param_list.get(c).getx() + "\", \"" + param_list.get(c).gety() + "\")";                            }              return ret;         }     }     private static boolean isletter(string p_inp) {         return p_inp.substring(0,1).matches("\\p{l}");     }       private static string parsesinglecommand(string p_inp, list<command> p_cmds) throws exception {         //read single command off incoming string , pass remaining input          string cmd = p_inp.substring(0,1);         if (!isletter(p_inp)) throw new exception("error command starts non letter (" + cmd + ")");           p_inp = p_inp.substring(1);         command c = new command(cmd);         p_inp = c.parseparams(p_inp);          p_cmds.add(c);         return p_inp;     }      private static list<command> parse(string p_inp) throws exception {         list<command> r = new arraylist<command>();          //spaces don't matter , want make case-insensitive minimise errors         p_inp = p_inp.tolowercase();         p_inp = p_inp.replace(" ", "");          while (p_inp.length()>0) {             p_inp = parsesinglecommand(p_inp,r);         }         return r;     }      public static void main(string[] args) {         system.out.println("start tmptest");          list<string> tests = new arraylist<string>();         tests.add("m1,1 l1,200,200,200,200,1 xe");         tests.add("m, l1,200,200,200,200,1 xe");          (int c=0;c<tests.size();c++) {             system.out.println("running test case " + c + " (" + tests.get(c) + ")");             try {                 list<command> pr = parse(tests.get(c));                  (int d=0;d<pr.size();d++) {                     system.out.println(pr.get(d).tostring());                 }              } catch (exception e) {                 e.printstacktrace();                 return;             }         };          system.out.println("end tmptest");     } }

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