Re: [KVM-AUTOTEST PATCH 4/5] kvm_config: add helper to raise exception informing line number

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On Tue, Jan 11, 2011 at 01:48:22AM -0200, Lucas Meneghel Rodrigues wrote:
> On Thu, 2011-01-06 at 14:12 -0200, Eduardo Habkost wrote:
> > +        for num,line in enumerate(str.splitlines(), 1):
> 
> ^ enumerate in py 2.4 takes exactly 1 argument, so it's not possible to
> provide the enumerate start index like this, 
> 
> http://docs.python.org/library/functions.html#enumerate

Oops! Right.


> 
> so we have to do something like:
> 
> +        sequence = str.splitlines()[1:]
> +        for num,line in enumerate(sequence):
> 
> To make it py2.4 compliant.

No, that's not what the 'start' parameter does. You don't want to skip the
first line from the input.

However, we can simply do the following:

    diff --git a/client/tests/kvm/kvm_config.py b/client/tests/kvm/kvm_config.py
    index c206743..5acf247 100755
    --- a/client/tests/kvm/kvm_config.py
    +++ b/client/tests/kvm/kvm_config.py
    @@ -549,7 +549,7 @@ class configreader:
             self.line_index = 0
             self.lines = []
             self.real_number = []
    -        for num,line in enumerate(str.splitlines(), 1):
    +        for num,line in enumerate(str.splitlines()):
                 line = line.rstrip().expandtabs()
                 stripped_line = line.strip()
                 indent = len(line) - len(stripped_line)
    @@ -558,7 +558,7 @@ class configreader:
                     or stripped_line.startswith("//")):
                     continue
                 self.lines.append((line, stripped_line, indent))
    -            self.real_number.append(num)
    +            self.real_number.append(num+1)
     
     
         def get_next_line(self):

Updated patch below.

--------------------
>From 09a1c35fa79127767de3c54dd02890658498e204 Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@xxxxxxxxxxx>
Date: Wed, 5 Jan 2011 17:34:48 -0200
Subject: [PATCH] kvm_config: add helper to raise exception informing line number

Useful for syntax or other errors on the config file. We want to tell
the user on which file:line the error is located.

Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxxx>
---
 client/tests/kvm/kvm_config.py |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/client/tests/kvm/kvm_config.py b/client/tests/kvm/kvm_config.py
index 35e2ab9..5acf247 100755
--- a/client/tests/kvm/kvm_config.py
+++ b/client/tests/kvm/kvm_config.py
@@ -548,7 +548,8 @@ class configreader:
         self.filename = filename
         self.line_index = 0
         self.lines = []
-        for line in str.splitlines():
+        self.real_number = []
+        for num,line in enumerate(str.splitlines()):
             line = line.rstrip().expandtabs()
             stripped_line = line.strip()
             indent = len(line) - len(stripped_line)
@@ -557,6 +558,7 @@ class configreader:
                 or stripped_line.startswith("//")):
                 continue
             self.lines.append((line, stripped_line, indent))
+            self.real_number.append(num+1)
 
 
     def get_next_line(self):
@@ -589,6 +591,18 @@ class configreader:
         """
         self.line_index = index
 
+    def raise_error(self, msg):
+        """Raise an error related to the last line returned by get_next_line()
+        """
+        if self.line_index == 0: # nothing was read. shouldn't happen, but...
+            line_id = 'BEGIN'
+        elif self.line_index >= len(self.lines): # past EOF
+            line_id = 'EOF'
+        else:
+            # line_index is the _next_ line. get the previous one
+            line_id = str(self.real_number[self.line_index-1])
+        raise error.AutotestError("%s:%s: %s" % (self.filename, line_id, msg))
+
 
 # Array structure:
 # ----------------
-- 
1.7.3.2

-- 
Eduardo
--
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