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extract field pairs from lines
Lists example from a Well House Consultants training course
More on Lists [link]
Source code: dt4u Module: T206
# Sample written with a delegate on a Well House Consultants Tcl course. # Each line of a data file has three header fields, followed by a series # of "relationship" fields and a series of file names that relate to each # of the relationships. Here is a piece of code to take such data lines # and extract the relationship / file name pairs. set example "T/N/R/Brother/Sister/Mum/Bob.txt/Esmerelda.txt/Sophie.txt" # Separator in the data is a / - turn the line into a list splitting at / set items [split $example /] # Calculate number of relationships set nrels [expr ([llength $items]-3)/2] # loop through each relationship for {set rel 0} {$rel < $nrels} {incr rel} { # get the relationship set relation [lindex $items [expr 3+$rel]] # get the file name set file [lindex $items [expr 3+$nrels+$rel]] puts "Look in $file to learn about your $relation" } Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl Programming * Tcl Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Lists" training module. You'll find a description of the topic and some
other closely related examples on the "Lists" module index page.
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