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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/info.n | 110 |
1 files changed, 109 insertions, 1 deletions
@@ -7,7 +7,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: info.n,v 1.17 2005/05/30 00:04:45 dkf Exp $ +'\" RCS: @(#) $Id: info.n,v 1.18 2006/11/28 22:20:27 andreas_kupries Exp $ '\" .so man.macros .TH info n 8.4 Tcl "Tcl Built-In Commands" @@ -82,6 +82,114 @@ into variable \fIvarname\fR. Returns \fB1\fR if the variable named \fIvarName\fR exists in the current context (either as a global or local variable) and has been defined by being given a value, returns \fB0\fR otherwise. + +.TP +\fBinfo frame\fR ?\fInumber\fR? +This command provides access to all frames on the stack, even those +hidden from \fBinfo level\fR. If \fInumber\fR is not specified, this +command returns a number giving the frame level of the command. This +is 1 if the command is invoked at top-level. If \fInumber\fR is +specified, then the result is a dictionary containing the location +information for the command at the \fInumber\fRed level on the stack. +.sp +If \fInumber\fR is positive (> 0) then it selects a particular stack +level (1 refers to the top-most active command, i.e., \fBinfo frame\fR +itself, 2 to the command it was called from, and so on); otherwise it +gives a level relative to the current command (0 refers to the current +command, i.e., \fBinfo frame\fR itself, -1 to its caller, and so on). +.sp +This is similar to how \fBinfo level\fR works, except that this +subcommand reports all frames, like \fBsource\fR'd scripts, +\fBeval\fR's, \fBuplevel\fR's, etc. +.sp +Note that for nested commands, like "foo [[bar [[x]]]]" only "x" will +be seen by an \fBinfo frame\fR invoked within "x". This is the same as +for \fBinfo level\fR and error stack traces. +.sp +The result dictionary may contain the keys listed below, with the +specified meanings for their values: +.RS +.TP +\fItype\fR +This entry is always present and describes the nature of the location +for the command. The recognized values are \fBsource\fR, \fBproc\fR, +\fBeval\fR, and \fBprecompiled\fR. +.RS +.TP +\fBsource\fR +means that the command is found in a script loaded by the \fBsource\fR +command. +.TP +\fBproc\fR +means that the command is found in dynamically created procedure body. +.TP +\fBeval\fR +means that the command is executed by \fBeval\fR or \fBuplevel\fR. +.TP +\fBprecompiled\fR +means that the command is found in a precompiled script (loadable by +the package \fBtbcload\fR), and no further information will be +available. +.RE +.TP +\fIline\fR +This entry provides the number of the line the command is at inside of +the script it is a part of. This information is not present for type +\fBprecompiled\fR. For type \fBsource\fR this information is counted +relative to the beginning of the file, whereas for the last two types +the line is counted relative to the start of the script. +.TP +\fIfile\fR +This entry is present only for type \fBsource\fR. It provides the +normalized path of the file the command is in. +.TP +\fIcmd\fR +This entry provides the string representation of the command. This is +usually the unsubstituted form, however for commands which are a pure +list executed by eval it is the substituted form as they have no other +string representation. Care is taken that the pure-List property of +the latter is not spoiled. +.TP +\fIproc\fR +This entry is present only if the command is found in the body of a +regular Tcl procedure. It then provides the name of that procedure. +.TP +\fIlambda\fR +This entry is present only if the command is found in the body of an +anonymous Tcl procedure, i.e. a lambda. It then provides the entire +definition of the lambda in question. +.TP +\fIlevel\fR +This entry is present only if the queried frame has a corresponding +frame returned by \fBinfo level\fR. It provides the index of this +frame, relative to the current level (0 and negative numbers). +.RE +.sp +.RS +A thing of note is that for procedures statically defined in files the +locations of commands in their bodies will be reported with type +\fBsource\fR and absolute line numbers, and not as type +\fBproc\fR. The same is true for procedures nested in statically +defined procedures, and literal eval scripts in files or statically +defined procedures. +.sp +In contrast, a procedure definition or \fBeval\fR within a dynamically +\fBeval\fRuated environment count linenumbers relative to the start of +their script, even if they would be able to count relative to the +start of the outer dynamic script. That type of number usually makes +more sense. +.sp +A different way of describing this behaviour is that file based +locations are tracked as deeply as possible, and where this is not +possible the lines are counted based on the smallest possible +\fBeval\fR or procedure body, as that scope is usually easier to find +than any dynamic outer scope. +.sp +The syntactic form \fB{expand}\fR is handled like \fBeval\fR. I.e. if it +is given a literal list argument the system tracks the linenumber +within the list words as well, and otherwise all linenumbers are +counted relative to the start of each word (smallest scope) +.RE .TP \fBinfo functions \fR?\fIpattern\fR? If \fIpattern\fR isn't specified, returns a list of all the math |