Adding tool for canonicalizing json files.

Fixes #154.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

prjxray/xjson.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+import re
+import json
+import sys
+
+
+def extract_numbers(s):
+    """
+    >>> extract_numbers("CLK_HROW_WR10END2_3")
+    ('CLK_HROW_WR', 10, 'END', 2, '_', 3)
+    >>> extract_numbers("VBRK_WR1END2")
+    ('VBRK_WR', 1, 'END', 2)
+    """
+    bits = []
+    for m in re.finditer("([^0-9]*)([0-9]*)",s):
+        if m.group(1):
+            bits.append(m.group(1))
+        if m.group(2):
+            bits.append(int(m.group(2)))
+    return tuple(bits)
+
+
+def sort(data):
+    # FIXME: We assume that a list is a tileconn.json format...
+    if isinstance(data, list):
+        for o in data:
+            o['wire_pairs'].sort(key=lambda o: (extract_numbers(o[0]), extract_numbers(o[1])))
+
+        data.sort(key=lambda o: (o['tile_types'], o['grid_deltas']))
+    else:
+        def walker(o, f):
+            if isinstance(o, dict):
+                for i in o.values():
+                    walker(i, f)
+            elif isinstance(o, list):
+                for i in o:
+                    walker(i, f)
+            f(o)
+
+        def f(o):
+            if isinstance(o, list):
+                if len(o) > 2:
+                    strings = all(isinstance(x, str) for x in o)
+                    if strings:
+                        o.sort()
+
+        walker(data, f)
+
+
+def pprint(f, data):
+    sort(data)
+    json.dump(d, f, sort_keys=True, indent=4)
+    f.write('\n')
+
+
+if __name__ == "__main__":
+    if len(sys.argv) == 1:
+        import doctest
+        doctest.testmod()
+    else:
+        assert len(sys.argv) == 2
+        d = json.load(open(sys.argv[1]))
+        pprint(sys.stdout, d)