Attachment "Tcl.n.patch" to
ticket [528717ffff]
added by
trier
2002-03-12 06:15:55.
*** doc/Tcl.n.orig Mon Mar 11 17:05:30 2002
--- doc/Tcl.n Mon Mar 11 17:33:17 2002
***************
*** 24,35 ****
Close brackets are command terminators during command substitution
(see below) unless quoted.
.IP [2]
! A command is evaluated in two steps.
First, the Tcl interpreter breaks the command into \fIwords\fR
and performs substitutions as described below.
These substitutions are performed in the same way for all
commands.
! The first word is used to locate a command procedure to
carry out the command, then all of the words of the command are
passed to the command procedure.
The command procedure is free to interpret each of its words
--- 24,35 ----
Close brackets are command terminators during command substitution
(see below) unless quoted.
.IP [2]
! A command is evaluated in two steps:
First, the Tcl interpreter breaks the command into \fIwords\fR
and performs substitutions as described below.
These substitutions are performed in the same way for all
commands.
! Next, the first word is used to locate a command procedure to
carry out the command, then all of the words of the command are
passed to the command procedure.
The command procedure is free to interpret each of its words
***************
*** 40,46 ****
Words of a command are separated by white space (except for
newlines, which are command separators).
.IP [4]
! If the first character of a word is double-quote (``"'') then
the word is terminated by the next double-quote character.
If semi-colons, close brackets, or white space characters
(including newlines) appear between the quotes then they are treated
--- 40,46 ----
Words of a command are separated by white space (except for
newlines, which are command separators).
.IP [4]
! If the first character of a word is double-quote (") then
the word is terminated by the next double-quote character.
If semi-colons, close brackets, or white space characters
(including newlines) appear between the quotes then they are treated
***************
*** 49,56 ****
are performed on the characters between the quotes as described below.
The double-quotes are not retained as part of the word.
.IP [5]
! If the first character of a word is an open brace (``{'') then
! the word is terminated by the matching close brace (``}'').
Braces nest within the word: for each additional open
brace there must be an additional close brace (however,
if an open brace or close brace within the word is
--- 49,56 ----
are performed on the characters between the quotes as described below.
The double-quotes are not retained as part of the word.
.IP [5]
! If the first character of a word is an open brace ("{") then
! the word is terminated by the matching close brace ("}").
Braces nest within the word: for each additional open
brace there must be an additional close brace (however,
if an open brace or close brace within the word is
***************
*** 63,81 ****
The word will consist of exactly the characters between the
outer braces, not including the braces themselves.
.IP [6]
! If a word contains an open bracket (``['') then Tcl performs
\fIcommand substitution\fR.
To do this it invokes the Tcl interpreter recursively to process
the characters following the open bracket as a Tcl script.
The script may contain any number of commands and must be terminated
! by a close bracket (``]'').
The result of the script (i.e. the result of its last command) is
substituted into the word in place of the brackets and all of the
characters between them.
There may be any number of command substitutions in a single word.
Command substitution is not performed on words enclosed in braces.
.IP [7]
! If a word contains a dollar-sign (``$'') then Tcl performs \fIvariable
substitution\fR: the dollar-sign and the following characters are
replaced in the word by the value of a variable.
Variable substitution may take any of the following forms:
--- 63,81 ----
The word will consist of exactly the characters between the
outer braces, not including the braces themselves.
.IP [6]
! If a word contains an open bracket ("[") then Tcl performs
\fIcommand substitution\fR.
To do this it invokes the Tcl interpreter recursively to process
the characters following the open bracket as a Tcl script.
The script may contain any number of commands and must be terminated
! by a close bracket ("]").
The result of the script (i.e. the result of its last command) is
substituted into the word in place of the brackets and all of the
characters between them.
There may be any number of command substitutions in a single word.
Command substitution is not performed on words enclosed in braces.
.IP [7]
! If a word contains a dollar-sign ("$") then Tcl performs \fIvariable
substitution\fR: the dollar-sign and the following characters are
replaced in the word by the value of a variable.
Variable substitution may take any of the following forms:
***************
*** 94,106 ****
.TP 15
\fB${\fIname\fB}\fR
\fIName\fR is the name of a scalar variable. It may contain any
characters whatsoever except for close braces.
.LP
There may be any number of variable substitutions in a single word.
Variable substitution is not performed on words enclosed in braces.
.RE
.IP [8]
! If a backslash (``\e'') appears within a word then
\fIbackslash substitution\fR occurs.
In all cases but those described below the backslash is dropped and
the following character is treated as an ordinary
--- 94,115 ----
.TP 15
\fB${\fIname\fB}\fR
\fIName\fR is the name of a scalar variable. It may contain any
+ characters whatsoever except for close braces, as long as it does not
+ have the syntax of an array variable substituion as described in
+ the next paragraph.
+ .TP 15
+ \fB${\fIname\fB(\fIindex\fB)}\fR
+ \fIName\fR gives the name of an array variable and \fIindex\fR gives
+ the name of an element within that array. \fIname\fR may contain any
+ characters whatsoever except for close braces and ends at the first
+ open parentheses ("(") character. \fIindex\fR may contain any
characters whatsoever except for close braces.
.LP
There may be any number of variable substitutions in a single word.
Variable substitution is not performed on words enclosed in braces.
.RE
.IP [8]
! If a backslash ("\e") appears within a word then
\fIbackslash substitution\fR occurs.
In all cases but those described below the backslash is dropped and
the following character is treated as an ordinary
***************
*** 143,149 ****
in braces or quotes.
.TP 7
\e\e
! Backslash (``\e'').
.VS 8.1 br
.TP 7
\e\fIooo\fR
--- 152,158 ----
in braces or quotes.
.TP 7
\e\e
! Backslash ("\e").
.VS 8.1 br
.TP 7
\e\fIooo\fR
***************
*** 171,177 ****
except for backslash-newline as described above.
.RE
.IP [9]
! If a hash character (``#'') appears at a point where Tcl is
expecting the first character of the first word of a command,
then the hash character and the characters that follow it, up
through the next newline, are treated as a comment and ignored.
--- 180,186 ----
except for backslash-newline as described above.
.RE
.IP [9]
! If a hash character ("#") appears at a point where Tcl is
expecting the first character of the first word of a command,
then the hash character and the characters that follow it, up
through the next newline, are treated as a comment and ignored.
