Provided by: tcllib_1.17-dfsg-1_all 
NAME
csv - Procedures to handle CSV data.
SYNOPSIS
package require Tcl 8.4
package require csv ?0.8?
::csv::iscomplete data
::csv::join values ?sepChar? ?delChar? ?delMode?
::csv::joinlist values ?sepChar? ?delChar? ?delMode?
::csv::joinmatrix matrix ?sepChar? ?delChar? ?delMode?
::csv::read2matrix ?-alternate? chan m {sepChar ,} {expand none}
::csv::read2queue ?-alternate? chan q {sepChar ,}
::csv::report cmd matrix ?chan?
::csv::split ?-alternate? line ?sepChar? ?delChar?
::csv::split2matrix ?-alternate? m line {sepChar ,} {expand none}
::csv::split2queue ?-alternate? q line {sepChar ,}
::csv::writematrix m chan ?sepChar? ?delChar?
::csv::writequeue q chan ?sepChar? ?delChar?
_________________________________________________________________________________________________
DESCRIPTION
The csv package provides commands to manipulate information in CSV FORMAT (CSV = Comma
Separated Values).
COMMANDS
The following commands are available:
::csv::iscomplete data
A predicate checking if the argument data is a complete csv record. The result is a
boolean flag indicating the completeness of the data. The result is true if the
data is complete.
::csv::join values ?sepChar? ?delChar? ?delMode?
Takes a list of values and returns a string in CSV format containing these values.
The separator character can be defined by the caller, but this is optional. The
default is ",". The quoting aka delimiting character can be defined by the caller,
but this is optional. The default is '"'. By default the quoting mode delMode is
"auto", surrounding values with delChar only when needed. When set to "always"
however, values are always surrounded by the delChar instead.
::csv::joinlist values ?sepChar? ?delChar? ?delMode?
Takes a list of lists of values and returns a string in CSV format containing these
values. The separator character can be defined by the caller, but this is optional.
The default is ",". The quoting character can be defined by the caller, but this is
optional. The default is '"'. By default the quoting mode delMode is "auto",
surrounding values with delChar only when needed. When set to "always" however,
values are always surrounded by the delChar instead. Each element of the outer
list is considered a record, these are separated by newlines in the result. The
elements of each record are formatted as usual (via ::csv::join).
::csv::joinmatrix matrix ?sepChar? ?delChar? ?delMode?
Takes a matrix object following the API specified for the struct::matrix package
and returns a string in CSV format containing these values. The separator character
can be defined by the caller, but this is optional. The default is ",". The quoting
character can be defined by the caller, but this is optional. The default is ยด"'.
By default the quoting mode delMode is "auto", surrounding values with delChar only
when needed. When set to "always" however, values are always surrounded by the
delChar instead. Each row of the matrix is considered a record, these are
separated by newlines in the result. The elements of each record are formatted as
usual (via ::csv::join).
::csv::read2matrix ?-alternate? chan m {sepChar ,} {expand none}
A wrapper around ::csv::split2matrix (see below) reading CSV-formatted lines from
the specified channel (until EOF) and adding them to the given matrix. For an
explanation of the expand argument see ::csv::split2matrix.
::csv::read2queue ?-alternate? chan q {sepChar ,}
A wrapper around ::csv::split2queue (see below) reading CSV-formatted lines from
the specified channel (until EOF) and adding them to the given queue.
::csv::report cmd matrix ?chan?
A report command which can be used by the matrix methods format 2string and format
2chan. For the latter this command delegates the work to ::csv::writematrix. cmd is
expected to be either printmatrix or printmatrix2channel. The channel argument,
chan, has to be present for the latter and must not be present for the first.
::csv::split ?-alternate? line ?sepChar? ?delChar?
converts a line in CSV format into a list of the values contained in the line. The
character used to separate the values from each other can be defined by the caller,
via sepChar, but this is optional. The default is ",". The quoting character can be
defined by the caller, but this is optional. The default is '"'.
If the option -alternate is specified a slightly different syntax is used to parse
the input. This syntax is explained below, in the section FORMAT.
::csv::split2matrix ?-alternate? m line {sepChar ,} {expand none}
The same as ::csv::split, but appends the resulting list as a new row to the matrix
m, using the method add row. The expansion mode specified via expand determines how
the command handles a matrix with less columns than contained in line. The allowed
modes are:
none This is the default mode. In this mode it is the responsibility of the
caller to ensure that the matrix has enough columns to contain the full
line. If there are not enough columns the list of values is silently
truncated at the end to fit.
empty In this mode the command expands an empty matrix to hold all columns of the
specified line, but goes no further. The overall effect is that the first of
a series of lines determines the number of columns in the matrix and all
following lines are truncated to that size, as if mode none was set.
auto In this mode the command expands the matrix as needed to hold all columns
contained in line. The overall effect is that after adding a series of lines
the matrix will have enough columns to hold all columns of the longest line
encountered so far.
::csv::split2queue ?-alternate? q line {sepChar ,}
The same as ::csv::split, but appending the resulting list as a single item to the
queue q, using the method put.
::csv::writematrix m chan ?sepChar? ?delChar?
A wrapper around ::csv::join taking all rows in the matrix m and writing them CSV
formatted into the channel chan.
::csv::writequeue q chan ?sepChar? ?delChar?
A wrapper around ::csv::join taking all items in the queue q (assumes that they are
lists) and writing them CSV formatted into the channel chan.
FORMAT
The format of regular CSV files is specified as
[1] Each record of a csv file (comma-separated values, as exported e.g. by Excel) is a
set of ASCII values separated by ",". For other languages it may be ";" however,
although this is not important for this case as the functions provided here allow
any separator character.
[2] If and only if a value contains itself the separator ",", then it (the value) has
to be put between "". If the value does not contain the separator character then
quoting is optional.
[3] If a value contains the character ", that character is represented by "".
[4] The output string "" represents the value ". In other words, it is assumed that it
was created through rule 3, and only this rule, i.e. that the value was not quoted.
An alternate format definition mainly used by MS products specifies that the output string
"" is a representation of the empty string. In other words, it is assumed that the output
was generated out of the empty string by quoting it (i.e. rule 2), and not through rule 3.
This is the only difference between the regular and the alternate format.
The alternate format is activated through specification of the option -alternate to the
various split commands.
EXAMPLE
Using the regular format the record
123,"123,521.2","Mary says ""Hello, I am Mary""",""
is parsed into the items
a) 123
b) 123,521.2
c) Mary says "Hello, I am Mary"
d) "
Using the alternate format the result is
a) 123
b) 123,521.2
c) Mary says "Hello, I am Mary"
d) (the empty string)
instead. As can be seen only item (d) is different, now the empty string instead of a ".
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other
problems. Please report such in the category csv of the Tcllib Trackers
[http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for enhancements you
may have for either package and/or documentation.
SEE ALSO
matrix, queue
KEYWORDS
csv, matrix, package, queue, tcllib
CATEGORY
Text processing
COPYRIGHT
Copyright (c) 2002-2013 Andreas Kupries <andreas_kupries@users.sourceforge.net>