scripts: Adopted dat tweak in other scripts

This just makes dat behave similarly to Python's getattr, etc:

- dat("bogus")       -> raises ValueError
- dat("bogus", 1234) -> returns 1234

This replaces try_dat, which is easy to forget about when copy-pasting
between scripts.

Though all of this wouldn't be necessary if only we could catch
exceptions in expressions...

scripts/csv.py

@@ -1296,11 +1296,11 @@ def punescape(s, attrs=None):
             f = m.group('format')
             if f[-1] in 'dboxX':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = int(v)
             elif f[-1] in 'fFeEgG':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = float(v)
             else:
                 f = ('<' if '-' in f else '>') + f.replace('-', '')

scripts/plot.py

@@ -245,7 +245,8 @@ class RingIO:
 
 
 # parse different data representations
-def dat(x):
+def dat(x, *args):
+    try:
         # allow the first part of an a/b fraction
         if '/' in x:
             x, _ = x.split('/', 1)
@@ -265,11 +266,12 @@ def dat(x):
         # else give up
         raise ValueError("invalid dat %r" % x)
 
-def try_dat(x):
-    try:
-        return dat(x)
-    except ValueError:
-        return None
+    # default on error?
+    except ValueError as e:
+        if args:
+            return args[0]
+        else:
+            raise
 
 def collect(csv_paths, defines=[]):
     # collect results from CSV files
@@ -495,11 +497,11 @@ def punescape(s, attrs=None):
             f = m.group('format')
             if f[-1] in 'dboxX':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = int(v)
             elif f[-1] in 'fFeEgG':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = float(v)
             else:
                 f = ('<' if '-' in f else '>') + f.replace('-', '')

scripts/plotmpl.py

@@ -169,7 +169,8 @@ def openio(path, mode='r', buffering=-1):
         return open(path, mode, buffering)
 
 # parse different data representations
-def dat(x):
+def dat(x, *args):
+    try:
         # allow the first part of an a/b fraction
         if '/' in x:
             x, _ = x.split('/', 1)
@@ -189,11 +190,12 @@ def dat(x):
         # else give up
         raise ValueError("invalid dat %r" % x)
 
-def try_dat(x):
-    try:
-        return dat(x)
-    except ValueError:
-        return None
+    # default on error?
+    except ValueError as e:
+        if args:
+            return args[0]
+        else:
+            raise
 
 def collect(csv_paths, defines=[]):
     # collect results from CSV files
@@ -419,11 +421,11 @@ def punescape(s, attrs=None):
             f = m.group('format')
             if f[-1] in 'dboxX':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = int(v)
             elif f[-1] in 'fFeEgG':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = float(v)
             else:
                 f = ('<' if '-' in f else '>') + f.replace('-', '')

scripts/treemap.py

@@ -46,7 +46,8 @@ def openio(path, mode='r', buffering=-1):
         return open(path, mode, buffering)
 
 # parse different data representations
-def dat(x):
+def dat(x, *args):
+    try:
         # allow the first part of an a/b fraction
         if '/' in x:
             x, _ = x.split('/', 1)
@@ -66,11 +67,12 @@ def dat(x):
         # else give up
         raise ValueError("invalid dat %r" % x)
 
-def try_dat(x):
-    try:
-        return dat(x)
-    except ValueError:
-        return None
+    # default on error?
+    except ValueError as e:
+        if args:
+            return args[0]
+        else:
+            raise
 
 def collect(csv_paths, defines=[]):
     # collect results from CSV files
@@ -279,11 +281,11 @@ def punescape(s, attrs=None):
             f = m.group('format')
             if f[-1] in 'dboxX':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = int(v)
             elif f[-1] in 'fFeEgG':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = float(v)
             else:
                 f = ('<' if '-' in f else '>') + f.replace('-', '')

scripts/treemapd3.py

@@ -62,7 +62,8 @@ def openio(path, mode='r', buffering=-1):
         return open(path, mode, buffering)
 
 # parse different data representations
-def dat(x):
+def dat(x, *args):
+    try:
         # allow the first part of an a/b fraction
         if '/' in x:
             x, _ = x.split('/', 1)
@@ -82,11 +83,12 @@ def dat(x):
         # else give up
         raise ValueError("invalid dat %r" % x)
 
-def try_dat(x):
-    try:
-        return dat(x)
-    except ValueError:
-        return None
+    # default on error?
+    except ValueError as e:
+        if args:
+            return args[0]
+        else:
+            raise
 
 def collect(csv_paths, defines=[]):
     # collect results from CSV files
@@ -295,11 +297,11 @@ def punescape(s, attrs=None):
             f = m.group('format')
             if f[-1] in 'dboxX':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = int(v)
             elif f[-1] in 'fFeEgG':
                 if isinstance(v, str):
-                    v = try_dat(v) or 0
+                    v = dat(v, 0)
                 v = float(v)
             else:
                 f = ('<' if '-' in f else '>') + f.replace('-', '')