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1995-07-25
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133 lines
pppprrrroooocccc((((nnnn)))) TTTTccccllll (((( )))) pppprrrroooocccc((((nnnn))))
_________________________________________________________________
NNNNAAAAMMMMEEEE
proc - Create a Tcl procedure
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
pppprrrroooocccc _n_a_m_e _a_r_g_s _b_o_d_y
_________________________________________________________________
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
The pppprrrroooocccc command creates a new Tcl procedure named _n_a_m_e,
replacing any existing command or procedure there may have
been by that name. Whenever the new command is invoked, the
contents of _b_o_d_y will be executed by the Tcl interpreter.
_A_r_g_s specifies the formal arguments to the procedure. It
consists of a list, possibly empty, each of whose elements
specifies one argument. Each argument specifier is also a
list with either one or two fields. If there is only a
single field in the specifier then it is the name of the
argument; if there are two fields, then the first is the
argument name and the second is its default value.
When _n_a_m_e is invoked a local variable will be created for
each of the formal arguments to the procedure; its value
will be the value of corresponding argument in the invoking
command or the argument's default value. Arguments with
default values need not be specified in a procedure
invocation. However, there must be enough actual arguments
for all the formal arguments that don't have defaults, and
there must not be any extra actual arguments. There is one
special case to permit procedures with variable numbers of
arguments. If the last formal argument has the name aaaarrrrggggssss,
then a call to the procedure may contain more actual
arguments than the procedure has formals. In this case, all
of the actual arguments starting at the one that would be
assigned to aaaarrrrggggssss are combined into a list (as if the lllliiiisssstttt
command had been used); this combined value is assigned to
the local variable aaaarrrrggggssss.
When _b_o_d_y is being executed, variable names normally refer
to local variables, which are created automatically when
referenced and deleted when the procedure returns. One
local variable is automatically created for each of the
procedure's arguments. Global variables can only be
accessed by invoking the gggglllloooobbbbaaaallll command or the uuuuppppvvvvaaaarrrr
command.
The pppprrrroooocccc command returns an empty string. When a procedure
is invoked, the procedure's return value is the value
specified in a rrrreeeettttuuuurrrrnnnn command. If the procedure doesn't
execute an explicit rrrreeeettttuuuurrrrnnnn, then its return value is the
Page 1 (printed 7/17/95)
pppprrrroooocccc((((nnnn)))) TTTTccccllll (((( )))) pppprrrroooocccc((((nnnn))))
value of the last command executed in the procedure's body.
If an error occurs while executing the procedure body, then
the procedure-as-a-whole will return that same error.
KKKKEEEEYYYYWWWWOOOORRRRDDDDSSSS
argument, procedure
Page 2 (printed 7/17/95)