'\" '\" Generated from file 'cmdr_parameter\&.man' by tcllib/doctools with format 'nroff' '\" Copyright (c) 2013-2016 Andreas Kupries '\" Copyright (c) 2013-2016 Documentation, Andreas Kupries '\" .TH "cmdr::parameter" n 1\&.4 doc "Cmdr, a framework for command line parsing and dispatch" .\" The -*- nroff -*- definitions below are for supplemental macros used .\" in Tcl/Tk manual entries. .\" .\" .AP type name in/out ?indent? .\" Start paragraph describing an argument to a library procedure. .\" type is type of argument (int, etc.), in/out is either "in", "out", .\" or "in/out" to describe whether procedure reads or modifies arg, .\" and indent is equivalent to second arg of .IP (shouldn't ever be .\" needed; use .AS below instead) .\" .\" .AS ?type? ?name? .\" Give maximum sizes of arguments for setting tab stops. Type and .\" name are examples of largest possible arguments that will be passed .\" to .AP later. If args are omitted, default tab stops are used. .\" .\" .BS .\" Start box enclosure. From here until next .BE, everything will be .\" enclosed in one large box. .\" .\" .BE .\" End of box enclosure. .\" .\" .CS .\" Begin code excerpt. .\" .\" .CE .\" End code excerpt. .\" .\" .VS ?version? ?br? .\" Begin vertical sidebar, for use in marking newly-changed parts .\" of man pages. The first argument is ignored and used for recording .\" the version when the .VS was added, so that the sidebars can be .\" found and removed when they reach a certain age. If another argument .\" is present, then a line break is forced before starting the sidebar. .\" .\" .VE .\" End of vertical sidebar. .\" .\" .DS .\" Begin an indented unfilled display. .\" .\" .DE .\" End of indented unfilled display. .\" .\" .SO ?manpage? .\" Start of list of standard options for a Tk widget. The manpage .\" argument defines where to look up the standard options; if .\" omitted, defaults to "options". The options follow on successive .\" lines, in three columns separated by tabs. .\" .\" .SE .\" End of list of standard options for a Tk widget. .\" .\" .OP cmdName dbName dbClass .\" Start of description of a specific option. cmdName gives the .\" option's name as specified in the class command, dbName gives .\" the option's name in the option database, and dbClass gives .\" the option's class in the option database. .\" .\" .UL arg1 arg2 .\" Print arg1 underlined, then print arg2 normally. .\" .\" .QW arg1 ?arg2? .\" Print arg1 in quotes, then arg2 normally (for trailing punctuation). .\" .\" .PQ arg1 ?arg2? .\" Print an open parenthesis, arg1 in quotes, then arg2 normally .\" (for trailing punctuation) and then a closing parenthesis. .\" .\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. .if t .wh -1.3i ^B .nr ^l \n(.l .ad b .\" # Start an argument description .de AP .ie !"\\$4"" .TP \\$4 .el \{\ . ie !"\\$2"" .TP \\n()Cu . el .TP 15 .\} .ta \\n()Au \\n()Bu .ie !"\\$3"" \{\ \&\\$1 \\fI\\$2\\fP (\\$3) .\".b .\} .el \{\ .br .ie !"\\$2"" \{\ \&\\$1 \\fI\\$2\\fP .\} .el \{\ \&\\fI\\$1\\fP .\} .\} .. .\" # define tabbing values for .AP .de AS .nr )A 10n .if !"\\$1"" .nr )A \\w'\\$1'u+3n .nr )B \\n()Au+15n .\" .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n .nr )C \\n()Bu+\\w'(in/out)'u+2n .. .AS Tcl_Interp Tcl_CreateInterp in/out .\" # BS - start boxed text .\" # ^y = starting y location .\" # ^b = 1 .de BS .br .mk ^y .nr ^b 1u .if n .nf .if n .ti 0 .if n \l'\\n(.lu\(ul' .if n .fi .. .\" # BE - end boxed text (draw box now) .de BE .nf .ti 0 .mk ^t .ie n \l'\\n(^lu\(ul' .el \{\ .\" Draw four-sided box normally, but don't draw top of .\" box if the box started on an earlier page. .ie !\\n(^b-1 \{\ \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .el \}\ \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .\} .fi .br .nr ^b 0 .. .\" # VS - start vertical sidebar .\" # ^Y = starting y location .\" # ^v = 1 (for troff; for nroff this doesn't matter) .de VS .if !"\\$2"" .br .mk ^Y .ie n 'mc \s12\(br\s0 .el .nr ^v 1u .. .\" # VE - end of vertical sidebar .de VE .ie n 'mc .el \{\ .ev 2 .nf .ti 0 .mk ^t \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n' .sp -1 .fi .ev .\} .nr ^v 0 .. .\" # Special macro to handle page bottom: finish off current .\" # box/sidebar if in box/sidebar mode, then invoked standard .\" # page bottom macro. .de ^B .ev 2 'ti 0 'nf .mk ^t .if \\n(^b \{\ .\" Draw three-sided box if this is the box's first page, .\" draw two sides but no top otherwise. .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .\} .if \\n(^v \{\ .nr ^x \\n(^tu+1v-\\n(^Yu \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c .\} .bp 'fi .ev .if \\n(^b \{\ .mk ^y .nr ^b 2 .\} .if \\n(^v \{\ .mk ^Y .\} .. .\" # DS - begin display .de DS .RS .nf .sp .. .\" # DE - end display .de DE .fi .RE .sp .. .\" # SO - start of list of standard options .de SO 'ie '\\$1'' .ds So \\fBoptions\\fR 'el .ds So \\fB\\$1\\fR .SH "STANDARD OPTIONS" .LP .nf .ta 5.5c 11c .ft B .. .\" # SE - end of list of standard options .de SE .fi .ft R .LP See the \\*(So manual entry for details on the standard options. .. .\" # OP - start of full description for a single option .de OP .LP .nf .ta 4c Command-Line Name: \\fB\\$1\\fR Database Name: \\fB\\$2\\fR Database Class: \\fB\\$3\\fR .fi .IP .. .\" # CS - begin code excerpt .de CS .RS .nf .ta .25i .5i .75i 1i .. .\" # CE - end code excerpt .de CE .fi .RE .. .\" # UL - underline word .de UL \\$1\l'|0\(ul'\\$2 .. .\" # QW - apply quotation marks to word .de QW .ie '\\*(lq'"' ``\\$1''\\$2 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\$2 .. .\" # PQ - apply parens and quotation marks to word .de PQ .ie '\\*(lq'"' (``\\$1''\\$2)\\$3 .\"" fix emacs highlighting .el (\\*(lq\\$1\\*(rq\\$2)\\$3 .. .\" # QR - quoted range .de QR .ie '\\*(lq'"' ``\\$1''\\-``\\$2''\\$3 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3 .. .\" # MT - "empty" string .de MT .QW "" .. .BS .SH NAME cmdr::parameter \- Cmdr - (Partially internal) Command parameters .SH SYNOPSIS package require \fBcmdr::parameter \fR .sp \fB::cmdr::parameter\fR \fBnew\fR \fIconfig\fR \fIorder\fR \fIcmdline\fR \fIrequired\fR \fIdefered\fR \fIname\fR \fIdescription\fR \fIspec\fR .sp \fB::cmdr::parameter\fR \fBcreate\fR \fIobj\fR \fIconfig\fR \fIorder\fR \fIcmdline\fR \fIrequired\fR \fIdefered\fR \fIname\fR \fIdescription\fR \fIspec\fR .sp \fB\fR \fBaccept\fR \fIx\fR .sp \fB\fR \fBcmdline\fR .sp \fB\fR \fBcode\fR .sp \fB\fR \fBcomplete-words\fR \fIparse\fR .sp \fB\fR \fBconfig\fR \fIword\&.\&.\&.\fR .sp \fB\fR \fBdefault\fR .sp \fB\fR \fBdefered\fR .sp \fB\fR \fBdescription\fR ?\fIdetail\fR? .sp \fB\fR \fBdocumented\fR .sp \fB\fR \fBdontinteract\fR .sp \fB\fR \fBflag\fR .sp \fB\fR \fBforget\fR .sp \fB\fR \fBgenerator\fR .sp \fB\fR \fBhasdefault\fR .sp \fB\fR \fBhelp\fR .sp \fB\fR \fBinteractive\fR .sp \fB\fR \fBinteract\fR ?\fIprompt\fR? .sp \fB\fR \fBisbool\fR .sp \fB\fR \fBis\fR \fItype\fR .sp \fB\fR \fBlabel\fR .sp \fB\fR \fBlist\fR .sp \fB\fR \fBlocker\fR .sp \fB\fR \fBlock\fR \fIreason\fR .sp \fB\fR \fBname\fR .sp \fB\fR \fBnopromote\fR .sp \fB\fR \fBoptions\fR .sp \fB\fR \fBordered\fR .sp \fB\fR \fBpresence\fR .sp \fB\fR \fBprimary\fR \fIoption\fR .sp \fB\fR \fBprocess\fR \fIdetail\fR \fIqueue\fR .sp \fB\fR \fBprompt\fR .sp \fB\fR \fBrequired\fR .sp \fB\fR \fBreset\fR ?\fIcleanup\fR? .sp \fB\fR \fBself\fR .sp \fB\fR \fBset?\fR .sp \fB\fR \fBsetq\fR \fIqueue\fR .sp \fB\fR \fBset\fR \fIvalue\fR .sp \fB\fR \fBstring\fR .sp \fB\fR \fBthreshold:\fR \fIn\fR .sp \fB\fR \fBthreshold\fR .sp \fB\fR \fBtype\fR .sp \fB\fR \fBundefined!\fR .sp \fB\fR \fBvalidator\fR .sp \fB\fR \fBvalue\fR .sp \fB\fR \fBwhen-complete\fR .sp \fB\fR \fBwhen-set\fR .sp .BE .SH DESCRIPTION .PP Welcome to the Cmdr project, written by Andreas Kupries\&. .PP For availability please read \fICmdr - How To Get The Sources\fR\&. .PP This package implements \fIparameters\fR, collections of which (see \fBcmdr::config\fR) serve as the configuration of privates (see \fBcmdr::private\fR)\&. .SH "CLASS API" The class API is not public\&. It is used internally by the framework when parsing a command hierarchy specification to create the necessary parameter instances\&. .PP It is described here for use by developers maintaining, modifying and extending the framework itself\&. A user of the framework has no need for it\&. .TP \fB::cmdr::parameter\fR \fBnew\fR \fIconfig\fR \fIorder\fR \fIcmdline\fR \fIrequired\fR \fIdefered\fR \fIname\fR \fIdescription\fR \fIspec\fR Create an auto-named instance of \fBcmdr::parameter\fR\&. .sp \fINot used\fR\&. .TP \fB::cmdr::parameter\fR \fBcreate\fR \fIobj\fR \fIconfig\fR \fIorder\fR \fIcmdline\fR \fIrequired\fR \fIdefered\fR \fIname\fR \fIdescription\fR \fIspec\fR Create a new instance of \fBcmdr::parameter\fR, named \fIobj\fR\&. Used by the DSL processing parts of the framework to instantiate parameters\&. .RS .TP string \fIobj\fR The (command) name of the new parameter instance\&. .TP cmdr::config \fIconfig\fR The instance command of the \fBcmdr::config\fR instance holding the parameter\&. .TP boolean \fIorder\fR Flag\&. Parameter is specified by order (\fBtrue\fR: argument), or name (\fBfalse\fR: option)\&. .TP boolean \fIcmdline\fR Flag\&. Parameter is visible on the command line (\fBtrue\fR: option, or argument), or not (\fBfalse\fR: state)\&. .TP boolean \fIrequired\fR Flag\&. Parameter is must be specified by the user at runtime (\fBtrue\fR), or not (\fBfalse\fR)\&. .TP boolean \fIdefered\fR Flag\&. The internal representation is computed on-demand (\fBtrue\fR), or in the completion phase (\fBfalse\fR)\&. .TP string \fIname\fR Internal name of the parameter\&. Also the name used in the help, if not overridden by a \fBlabel\fR declaration (in \fIspec\fR)\&. .TP string \fIdescription\fR Human-readable help text for the parameter\&. .TP script \fIspec\fR Tcl-script specifying the parameter in detail\&. Please read \fICmdr - Parameter Specification Language\fR for the details\&. .RE .PP .SH "INSTANCE API" Most of the instance API is not public\&. .PP It is described here for use by developers maintaining, modifying and extending the framework itself\&. A user of the framework has no need for it\&. .TP \fB\fR \fBaccept\fR \fIx\fR This method validates the string value \fIx\fR against the validation type of the parameter and returns a boolean value indicating success (\fBtrue\fR), or not (\fBfalse\fR)\&. The internal representation of \fIx\fR is not kept but released immediately\&. The parameter itself is not changed either\&. This is used during runtime by the 'test'-based processing of optional arguments\&. .RS .TP string \fIx\fR .RE .TP \fB\fR \fBcmdline\fR This accessor method returns the "cmdline" flag set during parameter construction\&. A result of \fBtrue\fR indicates that the parameter is visible on the command line (option, or argument), and otherwise (\fBfalse\fR) hidden (state)\&. .TP \fB\fR \fBcode\fR This method returns a string encoding the flags "required" and "list"\&. The mapping is as follows: .RS .TP \fB+\fR required, scalar .TP \fB?\fR optional, scalar .TP \fB+*\fR required, list .TP \fB?*\fR optional, list\&. .RE .TP \fB\fR \fBcomplete-words\fR \fIparse\fR This method is part of the main shell command line completion\&. For the details of its workings please read \fICmdr - Internals of command line completion\fR\&. .sp Given the completion state \fIparse\fR of a partial command line it returns a list of strings which are the valid completions at this point, for the parameter\&. .RS .TP dict \fIparse\fR A dictionary holding the current completion state of a partial command line\&. .RE .TP \fB\fR \fBconfig\fR \fIword\&.\&.\&.\fR This method either returns the \fBcmdr::config\fR instance containing the parameter, or the result of applying the words to that config instance\&. It is through this method that any script with access to a single parameter instance of a private will have access to all its parameters\&. .RS .TP string \fIword\&.\&.\&.\fR The method and its arguments to apply to the config instance holding the parameter\&. If none are specified the method \fBself\fR is implied, causing the return of the config instance itself\&. .RE .TP \fB\fR \fBdefault\fR This method returns the default value set by the parameter's specification, or the empty string\&. .TP \fB\fR \fBdefered\fR This accessor method returns the "defered" flag set during parameter construction\&. A result of \fBtrue\fR indicates that the parameter's internal representation is computed on-demand, and otherwise (\fBfalse\fR) during the completion phase\&. .TP \fB\fR \fBdescription\fR ?\fIdetail\fR? This method returns the parameter's help text\&. If the \fIdetail\fR is specified and the name of an automatic option controlled by this parameter its implicit description is returned instead of the description of its primary\&. .RS .TP string \fIdetail\fR Optional\&. The name of a automatic option controlled by the parameter\&. .RE .TP \fB\fR \fBdocumented\fR This accessor method returns the "documented" flag of the parameter\&. A value of \fBtrue\fR indicates that the parameter should be included in generated help, otherwise not\&. .TP \fB\fR \fBdontinteract\fR This method disables interactive entry of the parameter's value for one time\&. I\&.e\&. after the information was used (see method \fBvalue\fR) the flag automatically resets\&. The result of the method is the empty string\&. .TP \fB\fR \fBflag\fR This method returns the text of the primary flag of the parameter, including leading dashes\&. .TP \fB\fR \fBforget\fR This method releases the internal representation of the parameter's value, if it has any\&. See also method \fBreset\fR for a stronger form\&. .TP \fB\fR \fBgenerator\fR This method returns the "generate" command prefix callback, if it was set, and an empty list otherwise\&. .TP \fB\fR \fBhasdefault\fR This method returns a boolean flag indicating if the parameter's specification declared a default value for it (\fBtrue\fR), or not (\fBfalse\fR)\&. .TP \fB\fR \fBhelp\fR This method returns the help information for the parameter\&. Note that this method does \fInot\fR check the "documented" flag of the parameter\&. That is the responsibility of the caller\&. The result of the command is a structure of the form described in section \fBHelp Information\fR\&. .TP \fB\fR \fBinteractive\fR This method returns the "interactive" flag of the parameter\&. A result of \fBtrue\fR indicates that the parameter's string representation has to be queried interactively if no value was specified at runtime\&. .TP \fB\fR \fBinteract\fR ?\fIprompt\fR? This method interactively queries the string representation of the parameter from the user\&. If no \fIprompt\fR is specified the parameter's prompt from the specification is used\&. See also method \fBprompt\fR\&. The interaction takes the "list"-ness of the parameter into account\&. Note that the entered string(s) is/are validated and invalid information is rejected\&. .RS .TP string \fIprompt\fR Optional\&. The prompt to use for the interaction\&. .RE .TP \fB\fR \fBisbool\fR This method returns a boolean value indicating if the parameter uses the standard validation type "boolean" (\fBtrue\fR) or not (\fBfalse\fR)\&. The parts of the parameter responsible for processing option arguments use this information to invoke the hard-wired special cases for this type, or not\&. .TP \fB\fR \fBis\fR \fItype\fR This method returns a boolean value indicating if the parameter is of the specified \fItype\fR (\fBtrue\fR) or not (\fBfalse\fR)\&. .RS .TP string \fItype\fR The type to check the parameter against\&. Recognized values are .RS .TP \fBargument\fR .TP \fBoption\fR .TP \fBstate\fR .RE .RE .TP \fB\fR \fBlabel\fR This method returns the human-readable name of the parameter, for use in help\&. If not specifically overridden by the parameter's specification this is the same as the internal name (See method \fBname\fR)\&. .TP \fB\fR \fBlist\fR This accessor method returns the "list" flag of the parameter\&. A value of \fBtrue\fR indicates that the parameter's value is a list, otherwise a scalar\&. .TP \fB\fR \fBlocker\fR This accessor method returns the string set by method \fBlock\fR below, or the empty string if \fBlock\fR was not used\&. \fINote\fR: This information is reset by method \fBreset\fR, but not by \fBforget\fR\&. .TP \fB\fR \fBlock\fR \fIreason\fR This method locks the parameter against modification by the methods \fBset\fR and \fBsetq\fR, and remembers the \fIreason\fR for it\&. The reason is expected to be the name of another parameter whose use disallows the use of this one\&. \fINote\fR: Such a lock is reset by method \fBreset\fR, but not by \fBforget\fR\&. .RS .TP string \fIreason\fR The name of the parameter locking this one against further modification\&. .RE .TP \fB\fR \fBname\fR This method returns the internal name of the parameter\&. .TP \fB\fR \fBnopromote\fR This method returns the state of the non-promotion flag of the parameter\&. .TP \fB\fR \fBoptions\fR This method returns the list of option flags recognized by the parameter\&. .TP \fB\fR \fBordered\fR This accessor method returns the "order" flag set during parameter construction\&. A result of \fBtrue\fR indicates that the parameter is specified by order at runtime (argument), and otherwise (\fBfalse\fR) by name (option)\&. .TP \fB\fR \fBpresence\fR This method returns a boolean value indicating if the option parameter is set as presence-option (\fBtrue\fR) or not (\fBfalse\fR)\&. The parts of the parameter responsible for processing option arguments use this information to invoke the hard-wired special cases for presence, or not\&. .TP \fB\fR \fBprimary\fR \fIoption\fR This method returns a boolean value indicating if the named \fIoption\fR is the primary option of this parameter (\fBtrue\fR), or not (\fBfalse\fR)\&. An error will be thrown if the named option is not controlled by the parameter\&. .RS .TP string \fIoption\fR The name of the option to check\&. .RE .TP \fB\fR \fBprocess\fR \fIdetail\fR \fIqueue\fR This method extracts the value of the parameter from the command line\&. A \fBpresence\fR option takes nothing, whereas an \fBisbool\fR option takes the first value in the \fIqueue\fR, if it is a proper boolean, and defaults to \fBtrue\fR if not\&. Any other argument or option takes the first value in \fIqueue\fR\&. .RS .TP string \fIdetail\fR The name of the parameter, or the option flag referencing it\&. .TP struct::queue \fIqueue\fR The queue instance holding the words of the command line not yet processed by the system\&. .RE .TP \fB\fR \fBprompt\fR This method returns the prompt string used by the parameter for interactive entry\&. If not overridden by the parameter's specification this defaults to a string derived from the internal name of the parameter, i\&.e\&. "Enter \fBname\fR:"\&. .TP \fB\fR \fBrequired\fR This accessor method returns the "required" flag set during parameter construction\&. A result of \fBtrue\fR indicates that the parameter must be specified by the user at runtime, and otherwise may be left unspecified (\fBfalse\fR)\&. .TP \fB\fR \fBreset\fR ?\fIcleanup\fR? This method sets the parameter into the initial state where it has neither string nor internal representation, nor is it locked\&. This is a stronger form of \fBforget\fR\&. .RS .TP boolean \fIcleanup\fR .RE .TP \fB\fR \fBself\fR This method returns the parameter instance itself\&. .TP \fB\fR \fBset?\fR This accessor method returns a boolean value indicating if the parameter was given a string representation at runtime (\fBtrue\fR), or not (\fBfalse\fR)\&. .TP \fB\fR \fBsetq\fR \fIqueue\fR This method sets the first element of the \fIqueue\fR as the value of the parameter\&. For a "list" parameter all elements of the queue are taken as the new value of the parameter\&. This is not quite analogous to method \fBset\fR below\&. They behave the same for scalar parameters, and differ for "list" parameters\&. .RS .TP stack::queue \fIqueue\fR The queue instance holding the words of the command line not yet processed\&. .RE .TP \fB\fR \fBset\fR \fIvalue\fR This method sets the \fIvalue\fR as the new string representation of the parameter\&. For a "list" parameter the string representation is \fIextended\fR with the \fIvalue\fR\&. This action triggers the execution of the "when-set" callback\&. A previously existing internal representation is forgotten (See \fBforget\fR)\&. .RS .TP string \fIvalue\fR The new value of the parameter, or an extension of the existing value\&. .RE .TP \fB\fR \fBstring\fR This accessor method returns the string representation of the parameter\&. If such was not set an error will be thrown (See method \fBundefined!\fR)\&. .TP \fB\fR \fBthreshold:\fR \fIn\fR This method specifies the minimum number of words needed after the optional argument parameter for it to accept the current word for itself\&. Parameters which are not optional arguments ignore this method\&. The result of the method is the empty string\&. .RS .TP integer \fIn\fR The acceptance threshold for the parameter\&. .RE .TP \fB\fR \fBthreshold\fR This method returns the threshold set on the parameter\&. An empty string indicates a parameter without threshold\&. A value of -1 indicates that the optional argument accepts based on validation (See method \fBaccept\fR) instead of using a threshold\&. .TP \fB\fR \fBtype\fR This accessor method returns the type of the parameter, one of \fBargument\fR, \fBoption\fR, or \fBstate\fR\&. See also method \fBis\fR for type-checking\&. .TP \fB\fR \fBundefined!\fR This method explicitly throws a "parameter undefined" error for this parameter\&. .TP \fB\fR \fBvalidator\fR This method returns the "validate" command prefix callback (i\&.e\&. the parameter's validation type)\&. .TP \fB\fR \fBvalue\fR This accessor method returns the internal representation of the parameter\&. If necessary the data is computed from the parameter's string representation, "default" value, or "generate" callback\&. An error is thrown if the value could not be determined\&. (See method \fBundefined!\fR)\&. If the value is newly computed the action triggers the execution of the "when-complete" callback\&. .sp .sp A parameter asked for its internal representation goes through the following steps to deliver the value: .RS .IP [1] If the internal representation is already known, simply deliver it as is\&. In other words, the result of the following steps is cached, and the steps are run only once\&. .IP [2] If the internal representation has been declared as undefined already, simply error out (again)\&. This is still part of caching the result generated by the following steps\&. .IP [3] If the parameter has a string representation use the parameter's \fIvalidation type\fR to convert it to the proper internal representation, and return it\&. .IP [4] If interactive entry is possible (per the parameter's specification) perform the interaction\&. This saves the entered data as string representation which is then validated as per the previous step\&. Aborting the interaction leaves the parameter as undefined (which is thrown as error)\&. .IP [5] If a \fBgenerate\fR callback exists use it to obtain the internal representation, and return it\&. .IP [6] If a \fBdefault\fR value exists make it the internal representation, and return it\&. .sp Side note: As the parameter DSL only allows the declaration of one of \fBdefault\fR or \fBgenerate\fR only one of these steps can trigger\&. .IP [7] If the parameter is \fBoptional\fR use the empty string as the internal representation and return it\&. .sp \fINote\fR that this rule should never trigger as the parameter DSL enforces that \fIoptional\fR parameters always have one of \fBdefault\fR or \fBgenerate\fR\&. .IP [8] Leave the parameter is undefined and fail (throw an error)\&. .RE .TP \fB\fR \fBwhen-complete\fR This method returns the "when-complete" command prefix callback, if it was set, and an empty list otherwise\&. .TP \fB\fR \fBwhen-set\fR This method returns the "when-set" command prefix callback, if it was set, and an empty list otherwise\&. .PP .SH "HELP INFORMATION" The help information generated for parameters is a dictionary containing the keys below: .TP cmdline Output of method \fBcmdline\fR\&. .TP code Output of method \fBcode\fR\&. .TP default Output of method \fBdefault\fR\&. .TP defered Output of method \fBdefered\fR\&. .TP description Output of method \fBdescription\fR\&. .TP documented Output of method \fBdocumented\fR\&. .TP flags A dictionary mapping flag names to flag types, i\&.e\&. \fBprimary\fR, \fBalias\fR, or \fBinverted\fR\&. .TP generator Output of method \fBgenerator\fR\&. .TP interactive Output of method \fBinteractive\fR\&. .TP isbool Output of method \fBisbool\fR\&. .TP label Output of method \fBlabel\fR\&. .TP list Output of method \fBlist\fR\&. .TP ordered Output of method \fBordered\fR\&. .TP presence Output of method \fBpresence\fR\&. .TP prompt Output of method \fBprompt\fR\&. .TP required Output of method \fBrequired\fR\&. .TP threshold Output of method \fBthreshold\fR\&. .TP type Output of method \fBtype\fR\&. .TP validator Output of method \fBvalidator\fR\&. .PP .SH "BUGS, IDEAS, FEEDBACK" Both the package(s) and this documentation will undoubtedly contain bugs and other problems\&. Please report such at \fICmdr Tickets\fR [https:/core\&.tcl\&.tk/akupries/cmdr]\&. .PP Please also report any ideas you may have for enhancements of either package(s) and/or documentation\&. .SH KEYWORDS arguments, command hierarchy, command line completion, command line handling, command tree, editing command line, help for command line, hierarchy of commands, interactive command shell, optional arguments, options, parameters, processing command line, tree of commands .SH COPYRIGHT .nf Copyright (c) 2013-2016 Andreas Kupries Copyright (c) 2013-2016 Documentation, Andreas Kupries .fi