MacFormat 1999 April/macformat-075.iso/Shareware Plus/Applications/Alpha/Tcl/Packages/elecExpansions.tcl

Text File | 1999-01-31 | 23.5 KB | 829 lines | [TEXT/ALFA]

# Note from Vince: bug reports for this file should go to Tom Fetherston (install)
# (and probably to me too, since I have made some changes)

##===========================================================================
# elecExpansions, formerly acronymExpansions, formerly 'Word-Combinations Completion'

# AUTHOR
#
#    Thomas R. Fetherston
#    Internet: [e-mail]
#    USnail:   94 Lipp Ave, Pittsburgh, PA 15229-2001
#
################################################################################
# HISTORY
#
# modified                 who rev reason
# ----------------------   --- --- ------
# 12/2/97                   trf 1.8 made changes to fix TeX expansions
# 05/22/1997               trf 1.7 Removed uses of 'oneSpace', this messed up stop
#                                    locations.
# 05/14/1997               VD  1.6 Changed proc names to reflect new naming scheme
# 12/30/1996               trf 1.5 Modified so that this could be integrated with
#                                   Vince Darley's Completion package.
# 07/14/1996 {01:21:20 PM} trf 1.4 Changed previous hit to a list of previous hits
#                                   so hits would be offered only once.
# 07/14/1996 {12:04:37 PM} trf 1.3 work around for regexp to include a close bracket
# 07/12/1996 {12:53:38 AM} trf 1.2 Allow hint to be suffixed with certain puncuation
#                                    marks and still be expanded. Added hint check.
# 07/11/1996 {10:29:51 PM} trf 1.1 Allow expansion of hint prefixed with non-
#                                   alphabetic character(s).
#                                    Ensure Hit used is followed with only one
#                                    space.
# 07/05/1996 {10:28:20 PM} trf 1.0 Original
################################################################################

#
# Based on wordCompetion.tcl
# Originally composed by Mark Nagata ([e-mail])
# for Alpha 5.76, 4/22/94.
#
# Modified by Tim van der Leeuw ([e-mail]), 9/14/94.
# Modified by Tom Fetherston
# All the global variables needed to store state information between calls
# (start with __Gcw_)
#
# This provides a different kind of word completion than the distribution provides,
# (wordCompletion.tcl).  When you find yourself typing a lot of variable and function
# names over and over, and these names are word-combinations where the name is formed by
# either capitalizing each word or separating them with an underscore, just type the
# initial letter of each word and invoke acronymExpansion instead.
#

#
# The idea    of this    modification is    to allow you to    type a string consisting of    the
# initial letters of the words that    have been joined to make up
# a variable, function, or    procedure name.    This is    often shorter and more natural than
# typing a few letter and using wordCompletion. As I developed this routine I found that
# a regexp for more than three letters caused search to choke so only those letters of a
# "hint" are significant. A three letter pattern is used for the search.  After a possible
# hit is located, it is turned into an acronym and checked against the "hint"
##
# to do list
# ----------
# change __Gcw_prevHint to a list of previous hits so we only get new hits

# monitor the character(s) to the right of the cursor point so the automatic, "oneSapce"
# can be suppressed, e.g. if a comma, close "bracket", or return immediately follows,
# let the inserted text abut it without a space
#
# cause a hint that ends in an '[' to search for a hit that is
# a parameterized routine. (what is a routine depends on the mode),
# and invoke a "replacement that includes a template for the proper number of arguments

# let numerals play a role in finding a "Hit"

# let an invocation include a file or list to be searched instead of the current window.
##
# The string you are going to use expansion on is    entered    in lowercase. The words in
# the target you are trying to hit have to start with a capital
# (except the first word), or, be separated    by an underscore.

# The hint can be embedded between non-alphabetic characters and certain punctuation marks
# ( '[', '(', '{', ',', ';', ':', ''', '"', ']', ')', '}' ). The expanded hint remains
# so embedded, and the cursor appears one space beyond the trailing punctuation.

# e.g. if sin($gl) was expanded, we would get sin($__Gcw_len) (in this file).
# similarly, mouse($gph, would expand to 'mouse($__Gcw_prevHint, ', done twice, we would get
# 'mouse($__Gcw_prevHit, '.
##,
# The following binding is just a suggestion. It is the one that I like best, I have this
# in my pref.tcl file
# ascii 0x20 <c> bind::Expansion
# i.e. command-<space>

#================================================================================

alpha::extension elecExpansions 9.0b3 {
    alpha::package require elecBindings 9.0b1
    lunion flagPrefs(Electrics) listPickIfMultExpds
    # similarly for expansions
    newPref flag listPickIfMultExpds 0
} maintainer {
    "Tom Fetherston" "" ""
} uninstall this-file help {file "ElecCompletions Help"}

set __Gcw_prevHintPos -1
set __Gcw_prevHint {}
set __Gcw_prevsrcListName {}

ensureset __Gcw_already_expanding error
ensureset __Gcw_pos_expanding -1

##
 # -------------------------------------------------------------------------
 #
 #    "bind::Expansion"    --
 #
 #     If    we're already completing, jump to that procedure, else go through
 #     a mode-dependent list of expansion procedures    given by the array
 #     'completions',    these return either    '1'    to indicate    termination, or
 #     '0' to    say    either that    they failed    or that    they succeeded and that
 #     further expansion    procedures may be applied.
 # -------------------------------------------------------------------------
 ##
proc bind::Expansion {} {
    if {![completion::tabDeleteSelection]} return

    global __Gcw_already_expanding
    if {[elec::notAlreadyExpanding]} {
    set __Gcw_already_expanding error
    if {[expansion::user]} return
    set m [modeALike]
    global expanders
    set curPos [getPos]
    if {![catch {set expandersList $expanders($m)}]} {
        foreach e $expandersList {
        if {[completion $m $e]} return
        }
    }
    #if none of the expanders succeeded, (or, don't exist) try
    if {[pos::compare [getPos] == $curPos]} {
        expansion::acronym
    }
    }
}

##
 # -------------------------------------------------------------------------
 #
 #    "elec::notAlreadyExpanding" --
 #
 #     Call this to check    if we should divert    directly to    a previously
 #     registered    expansion procedure instead of    starting from scratch.
 # -------------------------------------------------------------------------
 ##
proc elec::notAlreadyExpanding {} {
    global __Gcw_already_expanding __Gcw_pos_expanding
    # do the old expansion if possible
    if {[pos::compare $__Gcw_pos_expanding == [getPos]]} {
    return [catch {elec::completion [modeALike] $__Gcw_already_expanding}]
    } else {
    return 1
    }
}

##
 # -------------------------------------------------------------------------
 #
 #    "elec::alreadyExpanding"    --
 #
 #     If    a expansion routine has been called once, and would like to
 #     be    called again (to cycle through a number    of possibilities), then
 #     it    should register    itself with    this procedure.
 # -------------------------------------------------------------------------
 ##
proc elec::alreadyExpanding { proc } {
    global __Gcw_already_expanding __Gcw_pos_expanding
    # store the given expansion
    set __Gcw_already_expanding $proc
    set __Gcw_pos_expanding [getPos]
}


##
 # These declare, in order,    the    names of the expander
 # procedures for each mode.  The actual procedure
 # must    be named '${mode}Expansion::${listItem}', unless
 # the item    is 'expansions::*' in which case that actual
 # procedure is    called.
 ##
#===========================================================================

set expanders(TeX) {ExCmd}
set expanders(Tcl) {}
set expanders(C) {}

# just so we have one!
set userExpansionw(date) {◊kill0◊[lindex [mtime [now]] 0]}

namespace eval expansion {}

proc expansion::user { {cmd ""} } {
    if {![string length $cmd]} { set cmd [completion::lastWord] }
    if {[containsSpace $cmd]} { return 0 }

    set curPos [getPos]

    elec::findCmd $cmd userExpansionw
    #if the above call resulted in a detectable action, (i.e. the
    # current positon has change), return 1
    if {[pos::compare [getPos] == $curPos]} {
    return 0
    } else {
    return 1
    }
}

#    -------------------
proc expansion::acronym {} {

    global __Gcw_len
    global __Gcw_prevHintPos
    global __Gcw_prevHint
    global __Gcw_endPrevRpl
    global __Gcw_prevHits
    global __Gcw_patt
    global __Gcw_nextStart
    global __Gcw_above_BELOW

    set To [getPos]
    set lastChar [lookAt [pos::math $To - 1]]
    set hintCapper [lookAt $To]
    switch -- $hintCapper {
    "\)" -
    "\}" -
    "\]" -
    " "  -
    "\t" {
        if {$lastChar != ","} {
        set trailingWhite {}
        } else {
        set trailingWhite " "
        }
    }
    "default" {
        switch -- $lastChar {
        "\(" -
        "\{" -
        "\{" -
        " "  -
        "\t" {
            set trailingWhite {}
        }
        default {
            set trailingWhite " "
        }
        }

    }
    }

    backwardWord
    set From [getPos]

    # adjust From to prune any non alphabetic prefix
    set hint [getText $From $To]

    # The following variables may not come into existence in the regexp
    #  below, so set up defaults.
    set tail ""
    set punc ""
    #can not seem to include a close brack as below
    #regexp {([a-zA-Z_]+)([\(\{\[,;:'"\}\)\]])*[     ]*$} $hint tail hint punc

    #work around on above
    regexp {([a-zA-Z0-9_]+)(([\(\{\[,;:'"\}\)])*(\])*([\(\{\[,;:'"\}\)])*)[     ]*$} $hint tail hint punc
    set From [pos::math $To - [string length $tail]]

    #   this is a 1stTry, but hint is illegal
    if {[pos::compare $From != $__Gcw_prevHintPos]} {
    if {[regexp {[0-9_]} $hint] > 0} {
        alertnote "Ilegal hint, must have only letters in it."
        select $From $To
        set __Gcw_prevHintPos -1
        return
    } elseif {$From==$To} {
        alertnote "Was not able to find any hint."
        set __Gcw_prevHintPos -1
        return
    }
    }


    # adjust To, leaving trailing spaces or tabs
    set To [expr $From + [string length [append junk $hint $punc]]]

    # if (Trying to complete a new hint)
    if {[pos::compare $From != $__Gcw_prevHintPos]} {
    set __Gcw_prevHint $hint
    set __Gcw_prevHits {}
    set __Gcw_len [string length $hint]
    set __Gcw_patt  [pFI $hint]
    set __Gcw_above_BELOW 0

    set start [pos::math $From - 1]
    set beg {}; set end {}
    set foundAbove 0
    elec::_searchAboveForHit start   beg end Hit foundAbove

    if {$foundAbove} {
        lappend __Gcw_prevHits $Hit

        # put in the Hit,
        set replacement {}
        append replacement $Hit $punc $trailingWhite
        replaceText $From $To $replacement
        goto [pos::math $From + [string length $replacement]]
        #         oneSpace


        message "found above."
        set __Gcw_prevHintPos $From

        set __Gcw_endPrevRpl [getPos]
        elec::_adjustGlobals __Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart
        return
    }

    set start $To
    set beg {}; set end {}
    set __Gcw_above_BELOW 1
    set foundBelow 0
    elec::_searchBelowForHit start   beg end Hit foundBelow

    if {$foundBelow} {
        lappend __Gcw_prevHits $Hit

        # put in the Hit,
        set replacement {}
        append replacement $Hit $punc $trailingWhite
        replaceText $From $To $replacement
        goto [pos::math $From + [string length $replacement]]

        message "found below."
        set __Gcw_prevHintPos $From

        set __Gcw_endPrevRpl [getPos]
        elec::_adjustGlobals __Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart
        return
    }

    #No Hit for this hint exists
    #     goto $To
    #     backwardWordSelect
    select $From $To
    set __Gcw_prevHintPos -1
    return

    # else: we are re-trying the previous hint
    } else {
    while 1 {
        #pre-set fndMsg, in case there is a valid Hit for this iteration
        if {$__Gcw_above_BELOW} {
        set fndMsg "found below."
        } else {
        set fndMsg "found above."
        }

        set start $__Gcw_nextStart
        set beg {}; set end {}
        set foundByContinuedSearch 0
        elec::_continueSearchForHit start  beg end Hit foundByContinuedSearch

        if {$foundByContinuedSearch} {
        #if (this Hit is not the same as the last one)
        if {[lsearch -exact $__Gcw_prevHits $Hit] == -1} {

            #add the hit to the list of previous hits
            lappend $__Gcw_prevHits $Hit

            # put in the Hit,
            if {($punc == ",") && [info exists tail]} {
            set trailingWhite " "
            }
            # put in the Hit,
            set replacement {}
            append replacement $Hit $punc $trailingWhite
            replaceText $From $To $replacement
            goto [pos::math $From + [string length $replacement]]

            message $fndMsg
            set __Gcw_endPrevRpl [getPos]
            elec::_adjustGlobals __Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart
            return

            #else: this Hit does not differ from the last
        } else {
            elec::_adjustGlobals __Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart
        }

        #else: another Hit was not found
        } else {
        #if (no more Hits can exist, because we have searched all the text)
        if {$__Gcw_above_BELOW} {
            message "Not found."
            #                 goto $To
            #                 backwardWordSelect
            select $__Gcw_prevHintPos $__Gcw_endPrevRpl
            set __Gcw_prevHintPos -1
            return
            #else: we haven't tried BELOW
        } else {
            set __Gcw_above_BELOW 1
            set __Gcw_nextStart $__Gcw_endPrevRpl
        }
        }

    }
    }
}

#    ---
proc pFI wordStarters {
    proc firstPost {char} {
    return [format "(%s|%s)" [string toupper $char] $char ]
    }

    proc fencePost {char} {
    return [format {(%1$s|_%1$s|_%2$s)} [string toupper $char] $char ]
    }

    set identifierLeader {(_|__)?}
    set wordTail {[a-z0-9]*}
    set identifierTail {[a-zA-Z0-9_]*}

    set idx_Last [expr {[string length $wordStarters]-1}]
    if {$idx_Last>2} {set idx_Last 2}

    set searchPatt  $identifierLeader
    append searchPatt [firstPost [string index $wordStarters 0]]
    append searchPatt $wordTail

    for {set i 1} {$i < $idx_Last} {incr i} {
    append searchPatt [fencePost [string index $wordStarters $i]]
    append searchPatt $wordTail
    }
    append searchPatt [fencePost [string index $wordStarters $i]]
    append searchPatt $identifierTail
    return $searchPatt
}

#Note: in all the following scripts that start with uplevel…, the
# agrguments are "fake", and serve only to show what variables
# are used by these macro-like subroutines.  Their primary purpose
# is to make the above code more readable.  Each is started with
# an underscore to indicate that they are internal to another
# routine, and should not be called by themselves.

#    ------------------  -in--  -out--------(bool)-
proc elec::_searchAboveForHit {start  beg end Hit success} {

    uplevel {
    set BegEnd {-1 -1}
    set moreToSearch 1
    while {$moreToSearch} {
        set foundAbove [expr {![catch {search -s -f 0 -r 1 -i 0 -m 1 -- $__Gcw_patt $start} BegEnd]}]
        set beg [lindex $BegEnd 0]
        set end [lindex $BegEnd 1]
        set Hit [getText $beg $end]
        unset BegEnd
        if {!$foundAbove} {break}

        set fullMatch [elec::acronymsAreEqual $hint $Hit]
        if {$fullMatch} {
        break

        } else {
        set foundAbove 0
        }

        if {[pos::compare $beg <= [minPos]]} {
        set moreToSearch 0
        } else {
        set start [pos::math $beg-1]
        }
    }
    }
}

#    ------------------  -in--  -out--------(bool)-
proc elec::_searchBelowForHit {start  beg end Hit success} {

    uplevel {
    set BegEnd {-1 -1}
    set moreToSearch 1
    while {$moreToSearch} {
        set foundBelow [expr {![catch {search -s -f 1 -r 1 -i 0 -m 1 -- \
          $__Gcw_patt $start} BegEnd]}]
        set beg [lindex $BegEnd 0]
        set end [lindex $BegEnd 1]
        set Hit [getText $beg $end]
        unset BegEnd
        if {!$foundBelow} {break}

        set fullMatch [elec::acronymsAreEqual $hint $Hit]
        if {$fullMatch} {
        break

        } else {
        set foundBelow 0
        }

        if {[pos::compare $end >= [maxPos]]} {
        set moreToSearch 0
        } else {
        set start [expr $end]
        }
    }
    }
}

#    ---------------------  -in--  -out--------(bool)-
proc elec::_continueSearchForHit {start  beg end Hit success} {

    uplevel {
    set BegEnd {-1 -1}
    set moreToSearch 1
    while {$moreToSearch} {
        set foundByContinuedSearch [expr {![catch {search -s -f $__Gcw_above_BELOW -r 1 -i 0 -m 1 -- \
          $__Gcw_patt $__Gcw_nextStart} BegEnd]}]
        set beg [lindex $BegEnd 0]
        set end [lindex $BegEnd 1]
        set Hit [getText $beg $end]
        unset BegEnd
        if {!$foundByContinuedSearch} {break}

        set fullMatch [elec::acronymsAreEqual $__Gcw_prevHint $Hit]
        if {$fullMatch} {
        break
        } else {
        set foundBelow 0
        }

        if {[pos::compare $end >= [maxPos]]} {
        set moreToSearch 0
        } else {
        elec::_adjustGlobals __Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart
        }
    }
    }
}

#    --------------  -in-------------  -mod-------------   -out-----------
proc elec::_adjustGlobals {__Gcw_endPrevRpl  __Gcw_above_BELOW   __Gcw_nextStart} {

    uplevel {
    if {$__Gcw_above_BELOW} {
        set __Gcw_nextStart $end
    } else {
        set __Gcw_nextStart [pos::math $beg - 1]
        if {[pos::compare $__Gcw_nextStart <= [minPos]]} {
        set __Gcw_above_BELOW 1
        set __Gcw_nextStart $__Gcw_endPrevRpl
        }
    }
    }
}



#    ----------(bool)  -in- ---------------
proc elec::acronymsAreEqual {hint wordCombination} {


    set splitOnUndrS [split $wordCombination {_}]
    set shoe {}
    foreach part $splitOnUndrS {
    if {$part == {}} continue
    set part [split $part {}]
    set part [lreplace $part 0 0 [string toupper [lindex $part 0]]]
    set part [join $part {}]
    append shoe $part
    }
    regsub -all \[a-z0-9\] $shoe {} shoe
    return [expr {![string compare [string toupper $hint] $shoe]}]
}


##
 # -------------------------------------------------------------------------
 #
 #    "elec::acronymListExpansions" --
 #
 #     Given a an acronym of the sub-words in a 'multi-word command' (the 'hint')
 #   and the name of a    list to    search,    that list consisting of
 #   acronyms-command pairs on separate lines that have been placed in
 #     alphabetical order    and    starting/ending    with a
 #     return, this proc returns a list of all pairs that have the hint as
 #   their first element or'0'    if there were none.
 #
 #     Based on Vince Darley's modeListCompletions
 # -------------------------------------------------------------------------
 ##
proc elec::acronymListExpansions { hint dictName } {
    global $dictName

    set reg {(\n}
    append reg $hint { +[^\n]+)+}
    if {[regexp $reg [set $dictName] pairs]} {
    set odd 1
    foreach m $pairs {
        if {$odd % 2 != 0} {
        incr odd
        continue
        }
        incr odd
        append matches $m " "
    }
    return $matches
    } else {
    return 0
    }
}

proc elec::expandThis { cmd matches {isdbllist 0} {forcequery 0}} {
    global possMatches returnedMatch listPickIfMultExpds

    set possMatches $matches
    set mquery [set match [lindex $matches 0]]
    if {$isdbllist} { set match [lindex [lindex $match 0] 0]}
    if { [set cmdnum [llength $matches]] == 1 || $match == $cmd } {
    # It's unique or already a command, so insert it
    backwardDeleteWord
    elec::commandPrefix
    insertText $match
    return $match
    } else {
    set item [lindex $matches [incr cmdnum -1]]
    if {$isdbllist} { set item [lindex [lindex $item 0] 0] }

    set num 1
    set correspondingNum 1
    set numberedChoices "\{"
    set currChoiceSet ""
    set setIdx 0
    set multiSets 0
    set pickNumOfStartIn(0) $correspondingNum
    foreach m $matches {
        append numberedList "\{$num $m\} "
        #make up a list of choiceSets, where eadh choice set has < 79
        # characters
        if {[string length "$currChoiceSet$correspondingNum $m "] < 77} {
        append numberedChoices "$correspondingNum $m "
        append currChoiceSet   "$correspondingNum $m "
        set setAndNum($num) [list $setIdx $correspondingNum]
        } else {
        incr setIdx
        set correspondingNum 1
        append numberedChoices "m…\} \{$correspondingNum $m "
        set currChoiceSet      "$correspondingNum $m "
        set setAndNum($num) [list $setIdx $correspondingNum]
        set pickNumOfStartIn($setIdx) $num
        set multiSets 1
        }
        incr correspondingNum
        incr num
    }
    if {$multiSets} {
        append numberedChoices "b…\}"
    } else {
        append numberedChoices "\}"
    }



    if { $listPickIfMultExpds } {
        beep
        if {[catch { set choice [listpick -p "Pick an expansion" $numberedList]}]} {
        message "Cancelled"
        return 1
        } else {
        backwardDeleteWord
        elec::commandPrefix
        set choice [lindex $choice 1]
        insertText $choice
        return $choice
        }

    } else {
        set pickNum 1
        set promptNum $pickNum
        set currChoiceSet_idx 0
        set c "\t"
        backwardDeleteWord
        elec::commandPrefix
        insertText [lindex $matches 0]

        while {[set c] == "\t"} {
        set currChoiceSet_idx [lindex $setAndNum($pickNum) 0]
        set currChoiceSet     [lindex $numberedChoices $currChoiceSet_idx]
        #look up what number in the currChoiceSet corresponds to the pickNum
        set currNum [lindex $setAndNum($pickNum) 1]
        regsub "$currNum " $currChoiceSet "=>" choices
        global returnedMatch
        set returnedMatch ""

        message $choices
        set c [getChar]
        set c [string tolower $c ]
        scan $c "%c" decRep
        if {$decRep == 27} {
            set c "esc"
        }
        switch -- $c {
            "\t" {
            incr pickNum
            if {$pickNum > [llength $matches]} {
                set pickNum 1
            }
            backwardDeleteWord
            elec::commandPrefix
            insertText [lindex $matches [expr {$pickNum -1}]]
            #set things up so we cylce to the next choice
            continue
            }
            " " -
            "\\" -
            "\r" {
            #these keys indicate that we are satisfied with the current choice,
            # just insert the key pressed
            #                       alertnote "you pressed a return, \\, or space"
            #                       alertnote "pickNum = $pickNum"
            return [list [lindex $matches [expr {$pickNum -1}]] $c]
            }
            "m" {
            #when there are more choices than can be diplayed on the statusline
            # pressing 'm', will get the next set of choices
            if {[string match "*m…" $currChoiceSet]} {
                set pickNum $pickNumOfStartIn([expr {$currChoiceSet_idx +1}])
            }
            if {[string match "*b…" $currChoiceSet]} {
                set pickNum 1
            }
            backwardDeleteWord
            elec::commandPrefix
            insertText [lindex $matches [expr {$pickNum -1}]]
            #set things up so we cylce to the next choice
            set c "\t"
            continue
            }
            "b" {
            #when there are more choices than can be diplayed on the statusline
            # pressing 'b', will get the first set of choices
            set pickNum 1
            set c "\t"
            backwardDeleteWord
            elec::commandPrefix
            insertText [lindex $matches [expr {$pickNum -1}]]
            #set things up so we cylce to the next choice
            continue
            }
            "esc" {
            #when you want to bypass this and get to acronymExpansion
            backwardDeleteWord
            insertText $cmd
            return 0
            }
            "default" {
            #see if c is, or can be converted to, a number in the range 1-9
            set strPos [string first $c "asdfghjkl123456789"]
            if {$strPos == -1} {
                beep
                return
            }
            set numberChoosen [expr {$strPos % 9}]
            if {$numberChoosen > [llength $possMatches]} {
                beep
                return
            }
            #alertnote "you choose number $numberChoosen"
            set returnedMatch [lindex $possMatches [expr {$pickNumOfStartIn($currChoiceSet_idx) + $numberChoosen -1}]]


            }
        }
        #             catch {statusPrompt -f $choices statusLineChooser}
        if {$returnedMatch != ""} {
            backwardDeleteWord
            elec::commandPrefix
            insertText $returnedMatch
            return $returnedMatch
        }

        }

    }

    return ""
    }


}



proc elec::commandPrefix {} {
    global mode

    switch -- $mode {
    "TeX" {
        set pos [getPos]
        set bol [getText [lineStart $pos] $pos]
        switch -glob $bol {
        "*\\begin\{" -
        "*\\end\{" -
        "*\\" {
            return
        }
        "default" {
            insertText "\\"
        }
        }
    }
    }
}