Difference between revisions of "Ns getcsv"
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(New page: '''NAME''' : ns_getcsv - Read CSV data from a file '''SYNOPSIS''' : '''ns_getcsv''' ''fp varName'' '''DESCRIPTION''' : '''ns_getcsv''' reads one line of CSV data from the specified fi...) |
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'''DESCRIPTION''' | '''DESCRIPTION''' | ||
| − | : '''ns_getcsv''' reads one line of CSV data from the specified file pointer (such as returned by the Tcl command open) and sets the variable specified by varName to a list of the elements in that row. Any | + | : '''ns_getcsv''' reads one line of CSV data from the specified file pointer (such as returned by the Tcl command open) and sets the variable specified by varName to a list of the elements in that row. Any double quotes in the line of data are removed. ns_getcsv returns the number of elements in the row. |
: If there are no more lines in the file to read, varName does not get set, and ns_getcsv returns -1 as the number of elements in the row. | : If there are no more lines in the file to read, varName does not get set, and ns_getcsv returns -1 as the number of elements in the row. | ||
| Line 21: | Line 21: | ||
:* Elements that contain commas must be surrounded by double quotes (e.g., "foo,bar"). | :* Elements that contain commas must be surrounded by double quotes (e.g., "foo,bar"). | ||
| − | :* If an element surrounded by double quotes also contains a double quote, you can escape the interior double quote by using two double quotes (e.g., "Evander ""Real Deal"" Holyfield" | + | :* If an element surrounded by double quotes also contains a double quote, you can escape the interior double quote by using two double quotes (e.g., "Evander ""Real Deal"" Holyfield") |
:* White space that isn't inside double quotes is ignored. For example, the line: 'bob, sarah, mary' will result in the list {bob sarah mary}. | :* White space that isn't inside double quotes is ignored. For example, the line: 'bob, sarah, mary' will result in the list {bob sarah mary}. | ||
| Line 29: | Line 29: | ||
'''NOTES''' | '''NOTES''' | ||
| − | ''' | + | :'''ns_getcsv''' is about 10 times faster than tcllib ::csv::split but currently doesn't support delimiters other than comma and only supports double-quotes, not single-quotes. Neither one properly supports csv files with newlines inside elements |
'''SEE ALSO''' | '''SEE ALSO''' | ||
Latest revision as of 05:15, 16 October 2009
NAME
- ns_getcsv - Read CSV data from a file
SYNOPSIS
- ns_getcsv fp varName
DESCRIPTION
- ns_getcsv reads one line of CSV data from the specified file pointer (such as returned by the Tcl command open) and sets the variable specified by varName to a list of the elements in that row. Any double quotes in the line of data are removed. ns_getcsv returns the number of elements in the row.
- If there are no more lines in the file to read, varName does not get set, and ns_getcsv returns -1 as the number of elements in the row.
- A CSV file is an ASCII file containing rows of data in the following syntax:
- Elements in each row must be separated by commas.
- Each row must end with either \n, \r, or \r\n.
- Elements that contain commas must be surrounded by double quotes (e.g., "foo,bar").
- If an element surrounded by double quotes also contains a double quote, you can escape the interior double quote by using two double quotes (e.g., "Evander ""Real Deal"" Holyfield")
- White space that isn't inside double quotes is ignored. For example, the line: 'bob, sarah, mary' will result in the list {bob sarah mary}.
- Null entries are okay, either embedded in the line or at the end of a line. For example, the line: 'bob,,sarah, ' will result in the list: {bob {} sarah {}}.
NOTES
- ns_getcsv is about 10 times faster than tcllib ::csv::split but currently doesn't support delimiters other than comma and only supports double-quotes, not single-quotes. Neither one properly supports csv files with newlines inside elements
SEE ALSO
