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::csv - Procedures to handle CSV data
package require Tcl 8.3
package require csv ?0.1?
::csv::join values {sepChar ,}
::csv::joinlist values {sepChar ,}
::csv::read2matrix chan m {sepChar ,}
::csv::read2queue chan q {sepChar ,}
::csv::report cmd matrix ?chan?
::csv::split line {sepChar ,}
::csv::split2queue q line {sepChar ,}
::csv::writematrix m chan {sepChar ,}
::csv::writequeue q chan {sepChar ,}
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The ::csv package provides commands to manipulate information in CSV format (CSV = Comma Separated Values).
The following commands are available:
::csv::join values {sepChar ,}
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 «,".
::csv::joinlist values {sepChar ,}
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 «,". 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::read2matrix chan m {sepChar ,}
A wrapper around ::csv::split2matrix (see below)
reading from CSV-formatted lines from the specified
channel (until EOF) and adding it to the given
matrix.
::csv::read2queue chan q {sepChar ,}
A wrapper around ::csv::split2queue (see below)
reading from CSV-formatted lines from the specified
channel (until EOF) and adding it 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 line {sepChar ,}
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 «,".
::csv::split2matrix m line {sepChar ,}
The same as ::csv::split, but appends the resulting
list as a new row to the matrix m, using the method
add row. 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.
::csv::split2queue 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 ,}
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 ,}
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.
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 (The functions provided here allow any separator character).
If a value contains itself the separator «,", then it (the value) is put between «".
If a value contains «, it is replaced by «".
The record
is parsed as follows:
csv