# $Id$ $VERSION{''.__FILE__} = '$Revision$'; # # >>Title:: Calculation Library # # >>Copyright:: # Copyright (c) 1996, Tim Hudson (tjh@mincom.com) # You may distribute under the terms specified in the LICENSE file. # # >>History:: # ----------------------------------------------------------------------- # Date Who Change # 19-Feb-97 tjh worked around a perl4 bug with complex substitution # ................. expressions with escaped double quotes # 18-Feb-97 tjh handle money (i.e. $1,250.75 is okay now) and # ................. FORMAT("money",EXPR) is supported too # 17-Feb-97 tjh FORMAT and PRECISION added along with ROWPRODUCT # ................. ROWAVERAGE, COLUMNPRODUCT, COLUMNAVERAGE # 17-Feb-97 tjh report errors with AppMsg so we get line numbers # ................. so we can actually debug things without poking into # ................. the code when things go wrong # 03-Jan-97 tjh added recursion support and extra functions # 03-Jan-97 tjh expanded prototype into new format for SDF2beta8 # 02-Jan-97 tjh original coding # ----------------------------------------------------------------------- # # >>Purpose:: # This library provides basically a mini-spreadsheet for using in tables # inside SDF # # >>Description:: # This requires SDF verion 2beta8 or above (which adds in a few new things # so that we have a nice syntax for calculations) # # This can be made to work in SDF2beta7c but it is worth upgrading to # a supported release :-) # # Calculation support for a table is activated by adding in an attribute # of calc (which triggers keeping track of the table contents in a cell # grid for later processing). # # A simple example: # # !block comment # !block table; format="10,20,70"; style="box" # Count Price Total # 10 5 \[\[=ROWPROD\]\] # 15 5.23 \[\[=ROWPROD\]\] # \[\[=COLSUM]] \[\[=COLSUM\]\] \[\[=COLSUM\]\] # !endblock # !endblock # # NB: # values are available until the next table is processed so # you can refer to data inside "normal" paragraphs after the table # NE: # # >>Limitations:: # # >>Resources:: # # >>Implementation:: # # (Yes Ian ... I did mean to add in the stanard SDF-like header stuff # above so it actually looks more like part of SDF but I've still got # a lot more documenting to do so that this is generally usable by # people that don't know how to read perl code :-) --tjh # # - check the value of the cell being used and if it is being used # inside a multiplication and is a text value then use 1 and if # inside an addition and is a text value then use 0 so that we can # use operations over cells with "random" text it them safely without # having to think too hard # - document how to use this sufficiently so that I don't get asked # questions about it # - implement a recursive decent parser so that we don't get confused # with really complex things (it works fine for my requirements at the # moment so I've not bothered) # package SDF_USER; sub chr { local($ascii)=@_; return sprintf("%c",$ascii); } # ---------------------------------------------------------------------------- # This requires SDF verion 2beta8 or above (which adds in a few new things # so that we have a nice syntax for calculations) # # This can be made to work in SDF2beta7c but it is worth upgrading to # a supported release :-) # # Calculation support for a table is activated by adding in an attribute # of calc (which triggers keeping track of the table contents in a cell # grid for later processing). # # A simple example: # # !block table; format="10,20,70"; style="box" # Count Price Total # 10 5 [[=ROWPROD]] # 15 5.23 [[=ROWPROD]] # [[=COLSUM]] [[=COLSUM]] [[=COLSUM]] # !endblock # # Note: values are available until the next table is processed so # you can refer to data inside "normal" paragraphs after the table # # ---------------------------------------------------------------------------- # The following are the target list of things that will be eventually # implemented (those starting with * have not yet been done): # (this is modelled off the standard things that I use in Excel) # + - * / # AVERAGE # SUM # MIN # MAX # *ROUND # COUNT # PRODUCT # *SUMPRODUCT # ROW ROW() is current row number # COLUMN COLUMN() is current column number # *IF IF(EXPR,TRUESTMT,FALSESTMT) # # Columns are named A-Z ... and rows are numbered sequentially starting # at 1 from the first non-header row ... # # Cells are labeled [A-Z][1-9]+ (I call these labels cellids) # # Ranges are done via cellid:cellid ... e.g. A1:C2 # # Example valid things ... that should be handled when I get around # to doing the general stuff later # # A1+A3-A2*B1 # # SUM(A1:A10,B1:B10,1,25) # SUMPRODUCT(A1:B3,D1:E3) # SUM(A1:B3*D1:E3) # # SDF usage is as follows: # [[=EXPRESSION]] # # [[=B1+B2+B3]] # [[=SUM(B1:B3)]] # [[=SUM(B1:B3,A1:A3)]] # [[=A1]] # # (it used to be !CALC EXPRESSION which was enhanced to be terser) # # Extra non-standard things that I've added that mean you can add # rows and columns into tables without having to play with the # calc values which by default require cellids # (yes I know ... I cannot help myself "extending" things) # # ROWSUM -> sum values of current row # COLSUM -> sum values of current column # ROWPROD -> multiply values of current row # COLPROD -> multiply values of current column # # multiplier for specifying precision # 100 = two decimal places (default) $_calc_restrict_precision=1; $calc_precision=2; $calc_strip_zeros=0; $_calc_last_strip_zeros=$calc_strip_zeros; $_calc_default_format='%.2f'; $_calc_default_units="numbers"; $_calc_test=0; $_calc_debug=0; $_calc_eval_debug=0; # data about the current table being processed is held here @_calc_data=(); $_calc_rows=0; $_calc_cols=0; # maximum depth we will recurse ... to stop infinite loops $_calc_max_recurse=10; # current depth of recursion $_calc_cur_recurse=0; $_calc_last_warning=''; # we only bitch once about each error $_calc_cur_warning=''; # we only bitch once about each error $_calc_row_offset=0; $_calc_last_group=0; @_calc_group_total=''; # calc_table ... activated during oncell processing to take a copy of # the data that is required by the calc function to implement # the spreadsheet-style calc stuff sub calc_table { # initialise if we are on the header roo if ($row == 0) { if ($col == 0) { @_calc_data=(); $_calc_rows=$last_row+1; # IGC to fix so +1 isn't needed $_calc_cols=$last_col; if ($_calc_debug) { print STDERR "NEWTABLE $_calc_rows,$_calc_cols\n"; } # grab any SDF vars that have been set that control # things on a global basis ... we do this at the start # of each table so we can change settings if needed if (defined $var{"CALC_PRECISION"}) { $ret=$var{"CALC_PRECISION"}; $calc_precision=$ret; } if (defined $var{"CALC_STRIP_ZEROS"}) { $var{"CALC_STRIP_ZEROES"}=$var{"CALC_STRIP_ZEROS"}; } if (defined $var{"CALC_STRIP_ZEROES"}) { $ret=$var{"CALC_STRIP_ZEROES"}; $calc_strip_zeros=$ret; $_calc_last_strip_zeros=$calc_strip_zeros; } if (defined $var{"CALC_UNITS"}) { $ret=$var{"CALC_UNITS"}; if ($ret eq "money") { $_calc_default_units="money"; $_calc_last_strip_zeros=$calc_strip_zeros; $calc_strip_zeros=0; } if ($ret eq "numbers" || $ret eq "digits") { $_calc_default_units="numbers"; $calc_strip_zeros=$_calc_last_strip_zeros; } } if (defined $var{"CALC_DEFAULT_FORMAT"}) { $_calc_default_format=$var{"CALC_DEFAULT_FORMAT"}; } } $_calc_row_offset=$body_start; # we are out by one ... if ($body_start>0) { $_calc_row_offset--; } # initialise things that need to be set on a per-table basis $_calc_cur_warning=''; $_calc_last_warning=''; $_calc_cur_recurse=0; $_calc_group_total{"$col"}=""; $_calc_last_group=0; #@_calc_group_total=(); return; } #print STDERR "[$row,$col] $row_type \"$cell\"\n"; if ( ($col == 0) && ($row_type eq "Group")) { #print STDERR "GROUP RANGE: " . &_calc_var_current_cell() . " " . &_calc_var_group_col_range() . "\n"; $_calc_last_group=$row; } # now hack things into submission that need to know about the # current row and col as this is the only chance we have of # getting that right # # we have to catch two forms [[=EXPR]] and [[&Calc("EXPR")]] which # is why we have the dogs breakfast below # $cell =~ s/\[\[([=+]|&Calc)([^\]]*)ROWPRODUCT([^\]]*)]]/"[[$1$2PRODUCT(" . &_calc_var_row_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLPRODUCT([^\]]*)]]/"[[$1$2PRODUCT(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)ROWAVERAGE([^\]]*)]]/"[[$1$2AVERAGE(" . &_calc_var_row_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLAVERAGE([^\]]*)]]/"[[$1$2AVERAGE(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLUMNAVERAGE([^\]]*)]]/"[[$1$2AVERAGE(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLUMNSUM([^\]]*)]]/"[[$1$2SUM(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLUMNPRODUCT([^\]]*)]]/"[[$1$2PRODUCT(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)ROWSUM([^\]]*)]]/"[[$1$2SUM(" . &_calc_var_row_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLSUM([^\]]*)]]/"[[$1$2SUM(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)ROWPROD([^\]]*)]]/"[[$1$2PRODUCT(" . &_calc_var_row_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLPROD([^\]]*)]]/"[[$1$2PRODUCT(" . &_calc_var_col_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)ROWAVG([^\]]*)]]/"[[$1$2AVERAGE(" . &_calc_var_row_range() . ")$3]]"/ge; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)COLAVG([^\]]*)]]/"[[$1$2AVERAGE(" . &_calc_var_col_range() . ")$3]]"/ge; # group things ... if ( $cell =~ m/\[\[([=+]|&Calc)([^\]]*)GROUPSUBTOTAL([^\]]*)]]/ ) { if ($_calc_group_total{"$col"}) { $_calc_group_total{"$col"} .= "+"; } $_calc_group_total{"$col"} .= &_calc_var_current_cell(); #print STDERR "GROUPTOTAL $col = " . $_calc_group_total{"$col"} . "\n"; $cell =~ s/\[\[([=+]|&Calc)([^\]]*)GROUPSUBTOTAL([^\]]*)]]/"[[$1$2SUM(" . &_calc_var_group_col_range() . ")$3]]"/ge; } $cell =~ s/\[\[([=+]|&Calc)([^\]]*)GROUPTOTAL([^\]]*)]]/"[[$1$2" . $_calc_group_total{"$col"} . "$3]]"/ge; # take reference to cell data which will remain valid # until the next table overwrites it $_calc_data{"$row","$col"}="$cell"; if ($_calc_debug) { print STDERR "DATA($row,$col)=" . $_calc_data{"$row","$col"} . " ($cell)\n"; } return; } sub _calc_min { local($args)=@_; local($ret,$x,@words); (@words)=split(/,/,$args); $ret=$words[0]; for($x=0;$x<=$#words;$x++) { $ret=$words[$x] if ($words[$x]<$ret); } return $ret; } sub _calc_max { local($args)=@_; local($ret,$x,@words); (@words)=split(/,/,$args); $ret=$words[0]; for($x=0;$x<=$#words;$x++) { $ret=$words[$x] if ($words[$x]>$ret); } return $ret; } sub _calc_format { local($fmt,$args)=@_; local($prec); # pull off the outer quotes which will have # come throught the single quoting we use to # survive the eval $fmt =~ s/^\"(.*)"$/$1/g; # we could have &_calc_safe_strings here for recursive things # that we have to eval too before going on as we have # got in the way of the normal eval by stealing its args #$args = eval &Calc("$args"); if ($_calc_eval_debug) { print STDERR "calc EVAL3: &Calc(\"$args\")\n"; } $args = eval &Calc("$args"); if ($_calc_debug) { print STDERR "_calc_format IN \"$fmt\",\"$args\"\n"; } # shortcut ... will round up to the nearest whole dollar if ( $fmt eq "dollars" ) { $fmt="money"; $prec="%.0f"; } else { $prec="%.2f"; } if ( ($fmt eq "\$") || ($fmt eq "money") || ($fmt eq "currency") ) { if ($_calc_debug) { print STDERR "_calc_format MONEY\n"; } # money is two decimal places always ... without zeros removed $args=sprintf($prec,"$args"); $ret = &_calc_format_money("$args"); $ret =~ s/\$/_DOLLAR_/g; $ret =~ s/,/_COMMA_/g; $ret =~ s/\./_DOT_/g; if ($_calc_debug) { print STDERR "_calc_format MONEY OUT \"$ret\"\n"; } } else { $ret=sprintf("$fmt",$args); } if ($_calc_debug) { print STDERR "_calc_format OUT \"$ret\"\n"; } return "$ret"; } # simple operator conversion ... with a few funny things that just # get ranges to become parameter lists to function calls %_calc_ops=( "SUM", "+", "PRODUCT", "*", "COUNT", "," ,"MIN", ",", "MAX", ",", "CALL", ","); sub _calc_expand_range { local($op,$start_range,$end_range)=@_; local($result); if ($_calc_debug) { print STDERR "calc_expand_range: \"OP=$op START=$start_range END=$end_range\"\n"; } $scell=substr($start_range,0,1); $srow=substr($start_range,1); $ecell=substr($end_range,0,1); $erow=substr($end_range,1); $result=''; for($x=ord($scell);$x<=ord($ecell);$x++) { for($y=$srow;$y<=$erow;$y++) { if ($result) { if ($_calc_ops{"$op"}) { $result .= $_calc_ops{"$op"} } else { &'AppMsg('error', "unknown operator '$op'"); #print STDERR "calc_expand_range:Unknown operator $op\n"; $result .= ","; } } $result .= &chr($x) . "$y"; } } if ($_calc_debug) { print STDERR "calc_expand_range: RESULT=$result\n"; } return $result; } # calc_var_row_range - range for entire row sub _calc_var_row_range { local($ret,$x,$y); $x = &chr(ord("A")+0); $y = &chr(ord("A")+$col-1); $ret = "$x" . "$row:" . "$y" . "$row"; return $ret; } # calc_var_group_row_range - range for entire group column sub _calc_var_group_col_range { local($ret,$x,$y,$z); $x = &chr(ord("A")+$col); $y = $row-1; $z = $_calc_last_group; $ret = "$x" . "$z:" . "$x" . "$y"; return $ret; } # calc_var_col_range - range for entire column sub _calc_var_col_range { local($ret,$x,$y); $x = &chr(ord("A")+$col); $y = $row-1; $ret = "$x" . "1:" . "$x" . "$y"; return $ret; } # calc_var_col_range - range for entire column sub _calc_var_current_cell { local($ret,$x,$y); $x = &chr(ord("A")+$col); $y = $row; $ret = "$x" . "$y"; return $ret; } sub _calc_safe_string { local($var,$val,$op)=@_; if ($_calc_debug) { print STDERR "SAFE_STRING IN $var,$val\n"; } # remove financial tokens ... $ and comma $val =~ s/\$([0-9,\.]+)/&_calc_unformat_money("$1")/ge; # return straight away if no op defined if ($op eq "" ) { if ($_calc_debug) { print STDERR "SAFE_STRING OUT1 $val\n"; } return "$val"; } # ignore things that are references to other bits # as we only want *plain* strings to be effected if ($val =~ m|^[&\[]| ) { if ($_calc_debug) { print STDERR "SAFE_STRING OUT2 $val\n"; } return "$val"; } # if it is a string then we handle it differently if we # are in the process of doing a multiply as we don't # want messy things just to skip string values in a # table if ( $val =~ m|[^0-9\. ]+| ) { if ($op eq "PRODUCT") { if ($_calc_debug) { print STDERR "STRING $var=>$val REWRITTEN to 1\n"; } $val = "1"; } else { if ($_calc_debug) { print STDERR "STRING $var=>$val\n"; } } } if ($_calc_debug) { print STDERR "SAFE_STRING OUT3 $val\n"; } return "$val"; } sub _calc_unformat_money { local($str)=@_; local($ret); $ret=$str; # remove commas $ret =~ s/,//g; if ($_calc_debug) { print STDERR "unformat_money($str)=$ret " . "formatted = " . &_calc_format_money($ret) . "\n"; } return $ret; } sub _calc_format_money { local($str)=@_; local($ret,$body); local($i,$len); $ret=$str; # drop off trailing decimal stuff until later $rest=''; # we do it this way as it works ... $len=length($ret); for($i=0;$i<=$len;$i++) { if (substr($ret,$len-$i,1) eq ".") { $rest=substr($ret,$len-$i); $ret=substr($ret,0,$len-$i); break; } } # now put in the commas in the right place ... there # is probably a nice routine somewhere that already does # this but I don't know it offhand $len=length($ret); $body=''; for($i=0;$i<=$len;$i++) { $body=substr($ret,$len-$i,1) . "$body"; if ($i != $len) { $body = "," . "$body" if ( (($i % 3) == 0) && ($i != 0)); } } $ret = "\$" . "$body$rest"; if ($_calc_debug) { print STDERR "format_money($str)=$ret body=$body rest=$rest\n"; } return "$ret"; } # calc_var_name - given a cell ID return the variable name that holds # the value for that cell sub _calc_var_name { local($cellid,$op)=@_; local($let,$num,$ret,$x,$y,$val); $let=substr($cellid,0,1); $num=substr($cellid,1); # offset numbers to skip headers ... $num += $_calc_row_offset; # we have to do things in two parts to keep perl happy $x = $num; $y = (ord("$let")-ord("A")); $ret = "&_calc_safe_string(\'DATA[$x,$y]\',\$_calc_data\{$x,$y\},$op)"; # short circuit out of bound lookups ... otherwise we # often end up recursing on ourself ... if ($y >= $_calc_rows) { return ""; } ## remove financial tokens ... $ and comma #$val =~ s/\$([0-9,.]*)/&_calc_unformat_money($1)/ge; if ($_calc_eval_debug) { print STDERR "calc EVAL4: $ret\n"; } $val=eval "$ret"; if ($_calc_debug) { print STDERR "calc_var_name($cellid\[$let,$num\])=$ret : x=$x y=$y val=$val\n"; } # match standard SDF expressions for string lookups if ( $val =~ m/\[\[([^=+&][^\]]*)\]\]/ ) { $val=$1; $ret=&Var("$val"); ##print STDERR "CALC SDF EXPR \"$val\"->\"$ret\"" . $var{"$val"} . "\n"; return &_calc_safe_string($val,$ret,$op); } # check to see if the variable points to a cell that contains a # formula ... if so then we need to evaluate that now ... which is # fine as long as some smart person doesn't setup a recursive # requirement between cells if (($val =~ m/\[\[[=+]([^\]]*)\]\]/) || ($val =~ m/\[\[&Calc([^\]]*)\]\]/)) { if ($_calc_debug) { print STDERR "CALC recursion required on $1\n"; } if ( $_calc_cur_recurse == 0) { $_calc_cur_warning = "$1"; } $_calc_cur_recurse++; if ($_calc_cur_recurse > $_calc_max_recurse) { if ("$_calc_last_warning" ne "$_calc_cur_warning") { &'AppMsg('warning', "CALC recursion limit reached '$_calc_cur_warning'"); $_calc_last_warning="$_calc_cur_warning"; } $ret="CALCERROR"; } else { if ($_calc_debug) { print STDERR "RECURSE START ON $1\n"; } $ret = &Calc($1); if ($_calc_debug) { print STDERR "RECURSE FINISH ON $1 => $ret\n"; } } $_calc_cur_recurse--; if ($_calc_debug) { print STDERR "calc_var_name($cellid\[$let,$num\])=$ret (recursion)\n"; } } return &_calc_safe_string($val,$ret,$op); } sub _head { local($arg)=@_; return "\"&_calc_format(\'$1\',\""; } sub _tail { local($arg)=@_; return "\")\""; } sub _calc_expr { local($op,$expr)=@_; local($_); local($have_format)=0; local($in_expr); if ($_calc_debug) { print STDERR "calc_expr: \"OP=$op EXPR=$expr\"\n"; } $in_expr="$expr"; # convert some of the operations into expressions involving # other operations ... which makes things easier to implement $expr =~ s/AVERAGE\((.*)\)/"(SUM($1)\/COUNT($1))"/g; $expr =~ s/MIN\((.*)\)/"&_calc_min(\"$1\")"/g; $expr =~ s/MAX\((.*)\)/"&_calc_max(\"$1\")"/g; print STDERR "calc_expr ALIVE1 expr=\"$expr\"\n" if ($_calc_debug); if ( $expr =~ m|FORMAT\((.*)\)| ) { #$expr =~ s/FORMAT\(([^,]*),(.*)\)/"\"&_calc_format(\'$1\',\"" . &Calc("$2") . "\")\""/ge; $expr =~ s/FORMAT\(([^,]*),(.*)\)/&_head($1) . &Calc("$2") . &_tail()/ge; $have_format=1; } if ( $expr =~ m|PRECISION\((.*)\)| ) { #$expr =~ s/PRECISION\(([^,]*),(.*)\)/"\"&_calc_format(\'\"%.$1f\"\',\"" . &Calc($2) . "\")\""/ge; $expr =~ s/PRECISION\(([^,]*),(.*)\)/&_head("%.$1f") . &Calc($2) . &_tail()/ge; $have_format=1; } print STDERR "calc_expr ALIVE2 expr=\"$expr\"\n" if ($_calc_debug); # if expression contains non-matching brackets we bail now # as it must be something that has slipped through that has # been expanded and then partially matched ... we really should # have a recursive decent parser here but I cannot be bothered # to do that as this does a good enough job as is $_ = "$expr"; if ( m|^[^\(\)]*\)| ) { if ($_calc_debug) { print STDERR "calc_expr: BAILING ON \"$expr\"\n"; } return "$expr"; } print STDERR "calc_expr ALIVE3 expr=\"$expr\"\n" if ($_calc_debug); # handle subroutine calls ... which we escape into # the form CALL &sub#" which is undone later $expr =~ s/(&[a-z_]*)\(([^\(\)]*)\)/"(" . &_calc_expr("CALL","$1#<$2>#") . ")"/ge; $expr =~ s/(&[a-z_]*)\((.*)\)/"(" . &_calc_expr("CALL","$1#<$2>#") . ")"/ge; print STDERR "calc_expr ALIVE4 expr=\"$expr\"\n" if ($_calc_debug); # handle any nested operations first ... #$expr =~ m/([A-Z]*)\(([^\(\)]*)\)/; #print STDERR "*****EXPR $in_expr => $expr inner = \"$1\",\"$2\"\n"; #$expr =~ s/([A-Z]*)\(([^\(\)]*)\)(\)|$)/"(" . &_calc_expr($1,$2) . ")"/ge; $expr =~ s/([A-Z]*)\(([^\(\)]*)\)/"(" . &_calc_expr($1,$2) . ")"/ge; # handle other ops now ... having gotten rid of series $expr =~ s/([A-Z]*)\((.*)\)/"(" . &_calc_expr($1,$2) . ")"/ge; # expand ranges into full variable requests with expanded ops $expr =~ s/([A-Z][0-9]+):([A-Z][0-9]+)/&_calc_expand_range($op,$1,$2)/ge; print STDERR "calc_expr ALIVE5 expr=\"$expr\"\n" if ($_calc_debug); # now handle individual expressions if ( $op eq "COUNT" ) { @words = split(/,/,$expr); $expr = $#words+1; } elsif ($_calc_ops{"$op"}) { if ($_calc_ops{"$op"} eq "*" ) { $expr =~ s/,/$_calc_ops{"$op"}/g; } else { $expr =~ s/,/$_calc_ops{"$op"}/g; } } else { } # now convert the cell references into perl variable names $expr =~ s/([A-Z][0-9]+)/&_calc_var_name($1,$op)/ge; # convert any escaped subroutine calls back to the real thing $expr =~ s/(\&[a-zA-Z_]*)#<([^>]*)>#/$1($2)/g; # undo any mucky things we have stuffed up and left double # brackets ... ikcy! $expr =~ s/\)\)([+*-\/])\(/)$1(/g; $pre_expr = "$expr"; # fix up quote things $expr =~ s/^"([^"]*)"$/$1/; $expr =~ s/^"([^"]*)$/$1/; $expr =~ s/([^"]*)"$/$1/; if ($_calc_eval_debug) { print STDERR "calc EVAL1: $pre_expr --> $expr\n"; } # and finally evaluate the expression using perl logic $ret = eval "$expr"; # second eval removes any rubbish outer brackets ... otherwise # we get tangled on them later :-( if ($_calc_eval_debug) { print STDERR "calc EVAL2: $ret\n"; } $ret = eval "$ret"; # then trim to two decimal places ... I don't care for more # than that by default in the result thought I'm sure that will # change in future if (!$have_format) { if ($_calc_restrict_precision) { if ($_calc_debug) { print STDERR "ret $ret => "; } if ($calc_precision) { $in=$ret; $ret =~ s/(\d*\.\d*)/sprintf("%.".$calc_precision."f",$1)/ge; $ret =~ s/(-\d*\.\d*)/sprintf("%.".$calc_precision."f",$1)/ge; $mid=$ret; # remove trailing zeros ... othewise things look really icky if ($calc_strip_zeros && !($ret =~ m|\$|) ) { $ret =~ s/(\.[1-9]*)(0+\s*)/$1/g; } if ($in!=$ret) { if ($_calc_debug) { print STDERR "PREC: $in->$mid->$ret\n"; } } } if ($_calc_debug) { print STDERR "$ret\n"; } } } # strip any brackets that are left as a side effect of having # done other calculations to get the result that added in # backets that eval doesn't seem to want to strip off $ret =~ s/^\((.*)\)$/$1/; return "$ret"; } sub Calc { local($in_expr)=@_; local($expr,$result); $expr=$in_expr; # handle all the control setting stuff ... $cell=$expr; if ( $cell =~ m/UNITS=(.*)/ ) { $cell = "MONEY" if ($1 eq "money"); $cell = "NUMBERS" if ($1 eq "numbers"); } if ( $cell eq "MONEY" ) { $_calc_default_units="money"; $_calc_last_strip_zeros=$calc_strip_zeros; $calc_strip_zeros=0; $cell = ""; } if ( $cell eq "NUMBERS" ) { $_calc_default_units="numbers"; $calc_strip_zeros=$_calc_last_strip_zeros; $cell = ""; } if ( $cell eq "DEBUG" ) { $_calc_debug=1; $cell = ""; } if ( $cell eq "NOSTRIPZEROS" || $cell eq "NOSTRIPZEROES" ) { $calc_strip_zeros=0; $cell = ""; } if ( $cell eq "STRIPZEROS" || $cell eq "STRIPZEROES" ) { $calc_strip_zeros=1; $cell = ""; } if ( $cell =~ m/PRECISION=(\d+)/ ) { $calc_precision=$1; $cell = ""; } # quick exit! if ($cell eq "") { return ""; } if ($_calc_debug) { print STDERR "calc: IN \"$expr\"\n"; } $result=&_calc_expr("","$expr"); # undo our escaping ... only at the top level $result =~ s/_DOLLAR_/\$/g; $result =~ s/_COMMA_/,/g; $result =~ s/_DOT_/./g; # handle overall formatting options if ($_calc_default_format) { $result=sprintf("$_calc_default_format","$result"); } # handle defaulting to money formatted output if ($_calc_default_units eq "money") { $result = &_calc_format_money("$result"); } if ($_calc_debug) { print STDERR "calc: \"$expr\" => $result\n"; } return $result; } # testing engine ... we really need some test case data here if ($_calc_test) { while() { chop; print &Calc("$_"); } } 1;