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The switch structure chooses among several possible alternatives. The choice is made by comparing a string value with several possible patterns. Each pattern has its own block of Tcl commands. If a match is found, the associated block is executed. The default keyword indicates a pattern that matches anything. If all of the other matches fail, the block associated with the default keyword is executed. The switch structure begins with the keyword switch, the options prefixed with -, and the string pattern to be matched, followed by a block containing all the patterns with their blocks. The syntax for the switch structure is described next:
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switch -options string-pattern { pattern { Tcl commands } pattern { Tcl commands } default { Tcl commands } }
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Options specify the pattern-matching capabilities. The following options are supported: -exact -glob -regexp Use exact matching when comparing string to a pattern. This is the default. When matching string to the patterns, use glob style matching. When matching string to the patterns, use regular expression matching (i.e., the same as implemented by the regexp command). Marks the end of options. The argument following this one will be treated
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as a string even if it starts with a -. The -regexp option lets you match any regular expression, whereas -glob lets you use the shell filename matching methods. With -glob, the shell special characters *, [], let you easily match on part of a string. With the -regexp option, you can match on complex alternative strings, specifying multiple instances of characters, the beginning or end of a string, and classes of characters. For example, to match on all filenames with the .c extension, you would use the following command:
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switch -glob *.c
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To match on words that end with a number, like "report17" and "report32," you could use the following command:
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switch -regexp report[0-9]*
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The while loop repeats commands. In Tcl, the while loop begins with the while command and takes two arguments, an expression, and either a single Tcl command or a block of Tcl commands. The expression is encased in braces. A block of Tcl commands begins with an opening brace on the same line as the while command. Then, on following lines are the Tcl commands that will be repeated in the loop. The block ends with a closing brace, usually on a line by itself. The syntax for the while loop with a single statement is described here:
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while {expression } { Tcl commands }
The for loop performs the same tasks as the while loop. However, it has a different format. The for loop takes four arguments, the first three of which are expressions and the last of which is a block of Tcl commands. The first three arguments are expressions that incorporate the initialization, test, and increment components of a loop. These expressions are each encased in braces. The last argument, the block of Tcl commands, begins with an opening brace and then continues with Tcl commands on the following lines, ending with a closing brace:
for {expression1} {expression2} {expression3} { Tcl commands; }
foreach
The foreach structure is designed to sequentially reference a list of values. It is very similar to the C shell's for-in structure. The foreach structure takes three arguments: a variable, a list, and a block of Tcl commands. Each value in the list is assigned to the variable in the foreach structure. Like the while structure, the foreach structure is a loop. Each time through the loop, the next value in the list is assigned to the variable. When the end of the list is reached, the
loop stops. As in the while loop, the block of Tcl commands is encased in braces. The syntax for the foreach loop is described here:
foreach variable ( list of values ) { tcl commands }
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