Add escape option for the conversion from/to CSV

[GoogleCodeExporter]

For the conversion from JSON to CSV, if escape option is true, the
following escapings happen:

1. " is escaped into "".

2. Some characters are escaped into 2-character escape sequences such as \t
(2 characters).

3. Some ISO control characters are escaped into 6-character escape
sequences such as \u008a.

For the conversion from CSV to JSON, escape option is in effect only if
quoted option is true. 

1. "" is unescaped into ". 

2. 2-character escape sequences such as \t (2 characters) are unescaped
into the character represented by the escape sequence.

3. 6-character escape sequences such as \u008a are unescaped into the
unicode character represented by the escape sequence.

For a input CSV file containing "\\" (4 characters):

1. \ (1 backslash character) is the unescaped result if both quoted option
and escape option are true. 

2. \\ (2 backslash characters) is the unescaped result if quoted option is
true and escape option is false. 

3. "\\" (1 quotation mark, 2 backslash characters and 1 quotation mark) is
the unescaped result if quoted option is false.

Original issue reported on code.google.com by yaojingguo@gmail.com on 2 May 2010 at 1:48

[GoogleCodeExporter]

Fixed in Revision 557.

Original comment by yaojingguo@gmail.com on 2 May 2010 at 2:22

• Changed state: Fixed