diff options
Diffstat (limited to 'doc/Tcl.n')
-rw-r--r-- | doc/Tcl.n | 40 |
1 files changed, 28 insertions, 12 deletions
@@ -4,11 +4,9 @@ '\" '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" -'\" RCS: @(#) $Id: Tcl.n,v 1.24 2010/01/13 12:08:30 dkf Exp $ '\" .so man.macros -.TH Tcl n "8.5" Tcl "Tcl Built-In Commands" +.TH Tcl n "8.6" Tcl "Tcl Built-In Commands" .BS .SH NAME Tcl \- Tool Command Language @@ -110,6 +108,8 @@ Variable substitution may take any of the following forms: \fIName\fR is the name of a scalar variable; the name is a sequence of one or more characters that are a letter, digit, underscore, or namespace separators (two or more colons). +Letters and digits are \fIonly\fR the standard ASCII ones (\fB0\fR\-\fB9\fR, +\fBA\fR\-\fBZ\fR and \fBa\fR\-\fBz\fR). .TP 15 \fB$\fIname\fB(\fIindex\fB)\fR . @@ -117,6 +117,8 @@ or namespace separators (two or more colons). the name of an element within that array. \fIName\fR must contain only letters, digits, underscores, and namespace separators, and may be an empty string. +Letters and digits are \fIonly\fR the standard ASCII ones (\fB0\fR\-\fB9\fR, +\fBA\fR\-\fBZ\fR and \fBa\fR\-\fBz\fR). Command substitutions, variable substitutions, and backslash substitutions are performed on the characters of \fIindex\fR. .TP 15 @@ -136,6 +138,10 @@ substitutions are performed during the parsing of \fIname\fR. .PP There may be any number of variable substitutions in a single word. Variable substitution is not performed on words enclosed in braces. +.PP +Note that variables may contain character sequences other than those listed +above, but in that case other mechanisms must be used to access them (e.g., +via the \fBset\fR command's single-argument form). .RE .IP "[9] \fBBackslash substitution.\fR" If a backslash @@ -187,23 +193,33 @@ Backslash .TP 7 \e\fIooo\fR . -The digits \fIooo\fR (one, two, or three of them) give an eight-bit octal -value for the Unicode character that will be inserted. The upper bits of the -Unicode character will be 0. +The digits \fIooo\fR (one, two, or three of them) give a eight-bit octal +value for the Unicode character that will be inserted, in the range \fI000\fR +- \fI377\fR. The parser will stop just before this range overflows, or when +the maximum of three digits is reached. The upper bits of the Unicode +character will be 0. .TP 7 \e\fBx\fIhh\fR . -The hexadecimal digits \fIhh\fR give an eight-bit hexadecimal value for the -Unicode character that will be inserted. Any number of hexadecimal digits -may be present; however, all but the last two are ignored (the result is -always a one-byte quantity). The upper bits of the Unicode character will -be 0. +The hexadecimal digits \fIhh\fR (one or two of them) give an eight-bit +hexadecimal value for the Unicode character that will be inserted. The upper +bits of the Unicode character will be 0. .TP 7 \e\fBu\fIhhhh\fR . The hexadecimal digits \fIhhhh\fR (one, two, three, or four of them) give a sixteen-bit hexadecimal value for the Unicode character that will be -inserted. +inserted. The upper bits of the Unicode character will be 0. +.TP 7 +\e\fBU\fIhhhhhhhh\fR +. +The hexadecimal digits \fIhhhhhhhh\fR (one up to eight of them) give a +twenty-one-bit hexadecimal value for the Unicode character that will be +inserted, in the range U+0000..U+10FFFF. The parser will stop just +before this range overflows, or when the maximum of eight digits +is reached. The upper bits of the Unicode character will be 0. +.PP +The range U+010000..U+10FFFD is reserved for the future. .PP Backslash substitution is not performed on words enclosed in braces, except for backslash-newline as described above. |