Adds support for negative indexed busses on ports

Signed-off-by: Chris Lavin <[email protected]>

Author: clavin-xlnx

src/com/xilinx/rapidwright/edif/EDIFTools.java

@@ -424,10 +424,10 @@ public static int lengthOfNameWithoutBus(char[] name) {
     }
 
     /**
-     * Determines if the char[] ends with the pattern [#:#] where # are positive bus
-     * values (e.g., [7:0]) and then returns the length of the string without the
-     * bus suffix (if it exists). If the name does not end with the bus pattern, it
-     * returns the original length of the char[].
+     * Determines if the char[] ends with the pattern [#:#] where # are integer bus
+     * values (e.g., [7:0] or [0:-1]) and then returns the length of the string
+     * without the bus suffix (if it exists). If the name does not end with the bus
+     * pattern, it returns the original length of the char[].
      * 
      * @param name
      * @param keepOpenBracket In the case of a bussed name, this will return the
@@ -439,11 +439,11 @@ public static int lengthOfNameWithoutBus(char[] name, boolean keepOpenBracket) {
         int len = name.length;
         int i = len-1;
         if (name[i--] != ']') return len;
-        while (Character.isDigit(name[i])) {
+        while (Character.isDigit(name[i]) || name[i] == '-') {
             i--;
         }
         if (name[i--] != ':') return len;
-        while (Character.isDigit(name[i])) {
+        while (Character.isDigit(name[i]) || name[i] == '-') {
             i--;
         }
         if (name[i] != '[') return len;

test/src/com/xilinx/rapidwright/edif/TestEDIFPort.java

@@ -82,8 +82,8 @@ public void testCreatePort() {
         EDIFCell cell = new EDIFCell(netlist.getWorkLibrary(), "cell_1");
         int outer = 0;
         // Creates ports: {bus_output[0][3:0], bus_output[2][5:2],
-        // bus_output[1][0:3], bus_output[3][2:5]}
-        for (String range : new String[] { "3:0", "0:3", "5:2", "2:5" }) {
+        // bus_output[1][0:3], bus_output[3][2:5], , bus_output[4][0:-1], bus_output[5][-3:-1]}
+        for (String range : new String[] { "3:0", "0:3", "5:2", "2:5", "0:-1", "-3:-1" }) {
             int left = Integer.parseInt(range.substring(0, range.indexOf(':')));
             int right = Integer.parseInt(range.substring(range.indexOf(':') + 1));
             int width = Math.abs(left - right) + 1;