'\" '\" Generated from file 'tcl_parse\&.man' by tcllib/doctools with format 'nroff' '\" Copyright (c) 2009 Andreas Kupries '\" .TH "doctools::tcl::parse" 3tcl 1 tcllib "Documentation tools" .\" 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 doctools::tcl::parse \- Processing text in 'subst -novariables' format .SH SYNOPSIS package require \fBTcl 8\&.4\fR .sp package require \fBsnit \fR .sp package require \fBfileutil \fR .sp package require \fBlogger \fR .sp package require \fBstruct::list \fR .sp package require \fBstruct::stack \fR .sp package require \fBstruct::set \fR .sp package require \fBtreeql \fR .sp package require \fBdoctools::tcl::parse \fR .sp \fB::doctools::tcl::parse\fR \fBtext\fR \fItree\fR \fItext\fR ?\fIroot\fR? .sp \fB::doctools::tcl::parse\fR \fBfile\fR \fItree\fR \fIpath\fR ?\fIroot\fR? .sp .BE .SH DESCRIPTION This package provides commands for parsing text with embedded Tcl commands as accepted by the Tcl builtin command \fBsubst -novariables\fR\&. The result of the parsing is an abstract syntax tree\&. .PP This is an internal package of doctools, for use by the higher level parsers processing the \fIdocidx\fR, \fIdoctoc\fR, and \fIdoctools\fR markup languages\&. .SH API .TP \fB::doctools::tcl::parse\fR \fBtext\fR \fItree\fR \fItext\fR ?\fIroot\fR? The command takes the \fItext\fR and parses it under the assumption that it contains a string acceptable to the Tcl builtin command \fBsubst -novariables\fR\&. Errors are thrown otherwise during the parsing\&. The format used for these errors in described in section \fBError format\fR\&. .sp The command returns the empty string as it result\&. The actual result of the parsing is entered into the tree structure \fItree\fR, under the node \fIroot\fR\&. If \fIroot\fR is not specified the root of \fItree\fR is used\&. The \fItree\fR has to exist and be the command of a tree object which supports the same methods as trees created by the package \fBstruct::tree\fR\&. .sp In case of errors \fItree\fR will be left in an undefined state\&. .TP \fB::doctools::tcl::parse\fR \fBfile\fR \fItree\fR \fIpath\fR ?\fIroot\fR? The same as \fBtext\fR, except that the text to parse is read from the file specified by \fIpath\fR\&. .PP .SH "ERROR FORMAT" When the parser encounters a problem in the input it will throw an error using the format described here\&. .IP [1] The message will contain the reason for the problem (unexpected character or end of input in input), the character in question, if any, and the line and column the problem was found at, in a human readable form\&. This part is not documented further as its format may change as we see fit\&. It is intended for human consumption, not machine\&. .IP [2] The error code however will contain a machine-readable representation of the problem, in the form of a 5-element list containing, in the order listed below .RS .IP [1] the constant string \fBdoctools::tcl::parse\fR .IP [2] the cause of the problem, one of .RS .TP \fBchar\fR Unexpected character in input .TP \fBeof\fR Unexpected end of the input .RE .IP [3] The location of the problem as offset from the beginning of the input, counted in characters\&. Note: Line markers count as one character\&. .IP [4] The line the problem was found on (counted from 1 (one)), .IP [5] The column the problem was found at (counted from 0 (zero)) .RE .PP .SH "TREE STRUCTURE" After successfully parsing a string the generated tree will have the following structure: .IP [1] In the following items the word 'root' refers to the node which was specified as the root of the tree when invoking either \fBtext\fR or \fBfile\fR\&. This may be the actual root of the tree\&. .IP [2] All the following items further ignore the possibility of pre-existing attributes in the pre-existing nodes\&. If attributes exists with the same names as the attributes used by the parser the pre-existing values are written over\&. Attributes with names not clashing with the parser's attributes are not touched\&. .IP [3] The root node has no attributes\&. .IP [4] All other nodes have the attributes .RS .TP type The value is a string from the set { Command , Text , Word } .TP range The value is either empty or a 2-element list containing integer numbers\&. The numbers are the offsets of the first and last character in the input text, of the token described by the node,\&. .TP line The value is an integer, it describes the line in the input the token described by the node ends on\&. Lines are counted from 1 (\fBone\fR)\&. .TP col The value is an integer, it describes the column in the line in the input the token described by the node ends on\&. Columns are counted from 0 (\fBzero\fR)\&. .RE .IP [5] The children of the root, if any, are of type Command and Text, in semi-alternation\&. This means: After a Text node a Command node has to follow, and anything can follow a Command node, a Text or other Command node\&. .IP [6] The children of a Command node, if any, are of type Command, and Text, and Word, they describe the arguments of the command\&. .IP [7] The children of a Word node, if any, are of type Command, Text, in semi-alternation\&. This means: After a Text node a Command node has to follow, and anything can follow a Command node, a Text or other Command node\&. .IP [8] A Word node without children represents the empty string\&. .IP [9] All Text nodes are leaves of the tree\&. .IP [10] All leaves of the tree are either Text or Command nodes\&. Word nodes cannot be leaves\&. .PP .SH "BUGS, IDEAS, FEEDBACK" This document, and the package it describes, will undoubtedly contain bugs and other problems\&. Please report such in the category \fIdoctools\fR of the \fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&. Please also report any ideas for enhancements you may have for either package and/or documentation\&. .SH KEYWORDS Tcl syntax, command, doctools, parser, subst, word .SH CATEGORY Documentation tools .SH COPYRIGHT .nf Copyright (c) 2009 Andreas Kupries .fi