<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Parse::RPN(3)         User Contributed Perl Documentation        Parse::RPN(3)



PPaarrssee--RRPPNN ((VV 22..xxxx)) -- IInnttrroodduuccttiioonn
         Parse::RPN - Is a minimalist RPN parser/processor (a little like FORTH)
         $Revision: 44 $

SSYYNNOOPPSSIISS
         use Parse::RPN;
         $result=rpn(string ...);
         @results=rpn(string ...);

         $error=rpn_error();

         string... is a list of RPN operator and value separated by a coma
         in scalar mode RPN return the result of the calculation (If the stack contain more then one element,
         you receive a warning and the top value on the stack)
         in array mode, you receive the content of the stack after evaluation

DDEESSCCRRIIPPTTIIOONN
         rpn() receive in entry a scalar of one or more elements coma separated
         and evaluate as an RPN (Reverse Polish Notation) command.
         The function split all elements and put in the stack.
         The operator are case sensitive.
         The operator are detect as is, if they are alone in the element of the stack.
         Extra space before or after are allowed
         (e.g "3,4,ADD" here ADD is an opeartor but it is not the case in "3,4,ADD 1")
         If element is not part of the predefined operator (dictionary), the element is push as a litteral.
         If you would like to put a string which is part of the dictionary, put it between quote or double-quote
         (e.g "3,4,'ADD'" here ADD is a literal and the evaluation reurn ADD and a warning because the stack is not empty)
         If the string contain a coma, you need also to quote or double-quote the string.
         (be care to close your quoted or double-quoted string)

         The evaluation follow the rule of RPN or FORTH or POSTCRIPT or pockect calcutor HP.
         Look on web for documentation about the use of RPN notation.

         I use this module in a application where the final user need to create an maintain
         a configuration file with the possibility to do calculation on variable returned from application.

         The idea of this module is comming from Math::RPN of Owen DeLong, owen@delong.com that I used for more then a year
         before some of my customer would like more ...
         I correct a bug (interversion of &gt; and &gt;=), add the STRING function, pattern search and some STACK functions.

         rpn_error() return the last error from the evaluation (illegal division by 0, error from the PERL function execution...)
         each time that rpn() is call the rpn_error() is reinitianised.

MMAATTHHEEMMAATTIICC ooppeerraattoorrss
       .

   aa bb ++
             return the result of 'a' + 'b'

   aa bb --
             return the result of 'a' - 'b'

   aa bb **
             return the result of 'a' * 'b'

   aa bb //
             return the result of 'a' / 'b'
             if b =0 return '' (to prevent exception raise)

   aa bb ****
             return the result of 'a' ** 'b'  (exponant)

   aa 11++
             return the result of 'a' +1

   aa 11--
             return the result of 'a' -1

   aa 22--
             return the result of 'a' -2

   aa 22++
             return the result of 'a' +2

   aa bb MMOODD
             return the result of 'a' % 'b'

   aa AABBSS
             return the result of  abs 'a'

   aa IINNTT
             return the result of INT 'a'

   aa ++--
             return the result negate value of 'a' (- 'a' )

   aa RREEMMAAIINN
             return the result of 'a' - int 'a' (fractional part of 'a' )

   aa SSIINN
             return the result of sin 'a'  ('a' in RADIAN)

   aa CCOOSS
             return the result of cos 'a'  ('a' in RADIAN)

   aa TTAANN
             return the result of tan 'a'  ('a' in RADIAN)

   aa CCTTAANN
             return the result of cotan 'a'  ('a' in RADIAN)

   aa LLNN
             return the result of ln 'a'
             if = 0 return '' (to prevent exception raise)

   aa EEXXPP
             return the result of 'e' ** 'a'

   PPII
             return the value of PI (3.14159265358979)

rreellaattiioonnaall ooppeerraattoorrss
       .

   aa bb &lt;&lt;
             return the result of 'a' &lt; 'b'  ( BOOLEAN value )

   aa bb &lt;&lt;==
             return the result of 'a' &lt;= 'b'  ( BOOLEAN value )

   aa bb &gt;&gt;
             return the result of 'a' &gt; 'b'  ( BOOLEAN value )

   aa bb &gt;&gt;==
             return the result of 'a' &gt;= 'b'  ( BOOLEAN value )

   aa bb ====
             return the result of 'a' == 'b'  ( BOOLEAN value ) 1 if a == b else 0

   aa bb &lt;&lt;==&gt;&gt;
             return the result of 'a' &lt;=&gt; 'b'  ( BOOLEAN value  ) -1 if a &lt; b ,0 if a == b, 1 if a &gt; b

   aa bb !!==
             return the result of 'a' != 'b'  ( BOOLEAN value ) 0 if a == b else 1

   aa bb OORR==
             return the result of 'a' || 'b'  ( BOOLEAN value ) 0 if a == b else 1

LLOOGGIICCAALL ooppeerraattoorrss
   aa bb OORR
             return the 1 one of the 2 argument are not equal to 0

   aa bb AANNDD
             return the 0 one of the 2 argument are equal to 0

   aa bb XXOORR
             return the 0 if the  2 argument are equal

   aa NNOOTT
             return the 0 if the argument is not eqauk to 0
             return the 1 if the argument is  eqauk to 0

   aa TTRRUUEE
             return the 1 if the top of stack is !=0 and if stack not empty

   aa FFAALLSSEE
             return the 0 if the top of stack is !=0

MMIISSCC ooppeerraattoorrss
   aa bb &gt;&gt;&gt;&gt;
             bitwise shift to the right
             shift the bits in a to the left of b level

   aa bb &lt;&lt;&lt;&lt;
             bitwise shift to the left
             shift the bits in a to the left of b level

   aa bb MMIINN
             return the result smallest of the 2 arguments

   aa bb MMAAXX
             return the result greatest of the 2 arguments

   aa VVAALL,,RREETT,, ""ooppeerraattoorr"" LLOOOOKKUUPP
             test with the "operator" the [a] value on each elements of VAL and if test succeed return the value from array RET with the same index
             the "operator" must be quoted to prevent evaluation

   aa VVAALL,,RREETT,, ""ooppeerraattoorr"" LLOOOOKKUUPPPP
             test with the perl "operator" the [a] value on each elements of VAL and if test succeed return the value from array RET with the same index
             the "operator" must be quoted to prevent evaluation

   aa VVAALL,,RREETT,,OOPPEE LLOOOOKKUUPP
             loop on each item of array VAL and test the value [ a ]  with the operator from ope ARRAY against the corresponding value in array VAL and return the value from array RET with the same index

   aa VVAALL,,RREETT,,OOPPEE LLOOOOKKUUPPPP
             loop on each item of array VAL and test the value [ a ]  with the perl operator from ope ARRAY against the corresponding value in array VAL and return the value from array RET with the same index

   TTIICCKK
             return the current time in ticks

   aa LLTTIIMMEE
             return the localtime coresponding to the ticks value 'a'
             the format is 'sec' 'min' 'hour' 'day_in_the_month' 'month' 'year' 'day_in_week' 'day_year' 'dayloight_saving'
             'year' is the elapsed year since 1900
             'month' start to 0
             The format is the same as localtime() in perl

   aa GGTTIIMMEE
             return the gmtime coresponding to the ticks value 'a'
             the format is 'sec' 'min' 'hour' 'day_in_the_month' 'month' 'year' 'day_in_week' 'day_year' 'dayloight_saving'
             'year' is the elapsed year since 1900
             'month' start to 0
             The format is the same as gmtime() in perl

   aa HHLLTTIIMMEE
             return the localtime coresponding to the ticks value 'a' in a human readable format

   aa HHGGTTIIMMEE
             return the gmtime coresponding to the ticks value 'a' in a human readable format

   RRAANNDD
             return a random value in the range [0,1[

   aa LLRRAANNDD
             return a random value in the range [0,'a'[

   aa SSPPAACCEE
             return the number 'a' formated with space each 3 digits

   aa DDOOTT
             return the number 'a' formated with . (dot) each 3 digits

   aa NNOORRMM
             return the number 'a' normalize by slice of 1000 with extra power value "K", "M", "G", "T", "P" (or nothing if lower than 1000)

   aa NNOORRMM22
             return the number 'a' normalize by slice of 1024 with extra power value "K", "M", "G", "T", "P" (or nothing if lower than 1024)

   aa OOCCTT
             return the decimal value for the HEX, BINARY or OCTAL value 'a'
             OCTAL is like  '0nn' where n is in the range of 0-7
             BINARY is like '0bnnn...'   where n is in the range of 0-1
             HEX is like '0xnnn' where n is in the range of 0-9A-F
             if no specific format convert as an hexadecimal by default

   aa OOCCTTSSTTRR22HHEEXX
             return a HEX string from a OCTETSTRING.
             useful when receiving an SNMP ASN.1 OCTETSTRING like mac address

   aa HHEEXX22OOCCTTSSTTRR
             return a OCTETSTRING string from a HEX
             useful when you need to check if an SNMP ASN.1 OCTETSTRING if matching the hex value provided

   aa DDDDEECC22SSTTRR
             return a string from a dotted DEC string
             useful when you need to manipulate an SNMP extension with 'exec'

   aa SSTTRR22DDDDEECC
             return a dotted DEC string to a string
             useful when you need to manipulate an SNMP extension with 'exec'

SSTTRRIINNGG ooppeerraattoorrss
       .

   aa bb EEQQ
             return the result of 'a' EQ 'b'  ( BOOLEAN value )

   aa bb NNEE
             return the result of 'a' NE 'b'  ( BOOLEAN value )

   aa bb LLTT
             return the result of 'a' LT 'b'  ( BOOLEAN value )

   aa bb GGTT
             return the result of 'a' GT 'b'  ( BOOLEAN value )

   aa bb LLEE
             return the result of 'a' LE 'b'  ( BOOLEAN value )

   aa bb GGEE
             return the result of 'a' GE 'b'  ( BOOLEAN value )

   aa bb CCMMPP
             return the result of 'a' CMP 'b'  ( BOOLEAN value )

   aa LLEENN
             return the length of 'a' EQ 'b'

   aa bb CCAATT
             return the concatenation 'a' and 'b'

   aa bb CCAATTAALLLL
             return the concatenation all element on the stack

   aa bb RREEPP
             return the result of 'a' x 'b'  duplicate 'a' by the number of 'x'

   aa RREEVV
             return the reverse of 'a' EQ 'b'

   aa bb cc SSUUBBSSTTRR
             return the substring of 'c' starting at 'b' with the length of 'a'

   aa UUCC
             return 'a' in uppercase

   aa LLCC
             return 'a' in lowercase

   aa UUCCFFIIRRSSTT
             return 'a' with the first letter in uppercase

   aa LLCCFFIIRRSSTT
             return 'a' with the first letter in lowercase

   aa bb SSPPLLIITT
             return all splitted item of 'a' by the separator 'b'
             'b' is a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry
             !!! if the split match on the beginning of string,
             SPLIT return the matched value WITHOUT the empty string of the beginning

   aa bb SSPPLLIITTII
             return all splitted item of 'a' by the separator 'b'
             'b' is a REGEX case insensitive
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry
             !!! if the split match on the beginning of string,
             SPLIT return the matched value WITHOUT the empty string of the beginning

   aa bb PPAATT
             return one or more occurance of 'b' in 'a'
             'b' is a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb PPAATTII
             return one or more occurance of 'b' in 'a'
             'b' is a REGEX case insensitive
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb TTPPAATT
             test if the pattern 'b' is in 'a'
             'b' is a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb TTPPAATTII
             test if the pattern 'b' is in 'a'
             'b' is a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb cc SSPPAATT
             substitute the pattern 'b' by the pattern 'a'  in 'c'
             'b' and 'c' are a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb cc SSPPAATTGG
             substitute the pattern 'b' by the pattern 'a'  in 'c' as many time as possible (g flag in REGEX)
             'b' and 'c' are a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb cc SSPPAATTII
             substitute the pattern 'b' by the pattern 'a'  in 'c'case insensitive (i flag in REGEX)
             'b' and 'c' are a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa bb cc SSPPAATTGGII
             substitute the pattern 'b' by the pattern 'a'  in 'c' as many time as possible (g flag in REGEX)
             and case insensitive (1 flag in REGEX)
             'b' and 'c' are a REGEX
             !!! becare, if you need to use : as a regex, you need to backslash to prevent overlap with new dictionary entry

   aa ...... zz PPRRIINNTTFF
            use the format 'z' to print the value(s) on the stack
            7,3,/,10,3,/,%d %f,PRINTF -&gt; 2 3.333333
            see printf in perl

   aa bb PPAACCKK
             pack the value 'a' with the format 'b'
             2004,06,08,a4 a2 a2,PACK -&gt; 20040608
             see pack in perl

   aa bb UUNNPPAACCKK
             unpack the value 'a' with the format 'b'
             20040608,a4 a2 a2,PACK -&gt; 2004,06,08
             see unpack in perl

   aa bb IISSNNUUMM
             test if top of the stack is a number
             return 1 if if it is a NUMBER otherwise return 0

   aa bb IISSNNUUMMDD
             test if top of the stack is a number
             delete the top element on the statck and return 1 if it is a NUMBER otherwise return 0

   aa bb IISSIINNTT
             test if top of the stack is a integer (natural number)
             return 1 if if it is a INTEGER otherwise return 0

   aa bb IISSIINNTTDD
             test if top of the stack is a integer (natural number)
             delete the top element on the statck and return 1 if it is a INTEGER otherwise return 0

   aa bb IISSHHEEXX
             test if top of the stack is a hexadecimal value (starting with 0x or 0X or # )
             return 1 if if it is a HEXADECIMAL otherwise return 0

   aa bb IISSHHEEXXDD
             test if top of the stack is a hexadecimal value (starting with 0x or 0X or # )
             delete the top element on the statck and return 1 if it is a HEXADECIMAL otherwise return 0

SSTTAACCKK ooppeerraattoorrss
       .

   aa bb SSWWAAPP
               return 'b' 'a'

   aa bb OOVVEERR
               return 'a' 'b' 'a'

   aa DDUUPP
               return 'a' 'a'

   aa bb DDDDUUPP
               return 'a' 'b' 'a' 'b'

   aa bb cc RROOTT
               return 'b' 'c' 'a'

   aa bb cc RRRROOTT
               return 'c' 'a' 'b'

   DDEEPPTTHH
               return the number of elements on the stack

   aa bb PPOOPP
               remove the last element on the stack

   aa ...... zz PPOOPPNN
               remove the 'z' last element(s) from the stack

   aa bb cc dd ee nn RROOLLLL
               rotate the stack on 'n' element
               a,b,c,d,e,4,ROLL -&gt; a c d e b
               if n = 3 &lt;=&gt; ROT

   aa PPIICCKK
               copy element from depth 'a' to the stack

   aa GGEETT
               get (remove) element from depth 'a'
               and put on top of stack

   aa bb PPUUTT
               put element 'a' at the level 'b' of the stack
               if 'b' gretaer than the stack put at first place
               if 'b' &lt; 0 start to the reverse order of the stack

   aa bb DDEELL
               delete 'b' element on the stack from level 'a'
               'a' and 'b' is get in absolute value

   aa FFIINNDD
               get the level of stack containing the exact value 'a'

   aa SSEEAARRCCHH
               get the first level of stack containing the REGEX 'a'

   aa SSEEAARRCCHHII
               get the first level of stack containing the REGEX 'a' (cas insensitive)

   aa SSEEAARRCCHHKK
               keep all level of stack containing the REGEX 'a' (cas sensitive)

   aa SSEEAARRCCHHKK
               keep all level of stack containing the REGEX 'a' (cas insensitive)

   aa KKEEEEPP
               delete all element on the stack except the level 'a'
               if 'a' is deeper then stack, keep the stack untouched

   aa bb KKEEEEPPNN
               keep 'b' element on the stack from level 'a'
               and delete all other element
               'a' and 'b' is get in absolute value

   aa bb PPRREESSEERRVVEE
               keep  element on the stack from level 'a'
               to level 'b'
               and delete all other element
               'a' and 'b' is get in absolute value
               if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)

   aa bb CCOOPPYY
               copy  element on the stack from level 'a'
               to level 'b'
               'a' and 'b' is get in absolute value
               if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)

DDIICCTTIIOONNAARRYY aanndd VVAARRSS ooppeerraattoorrss
       .

   WWOORRDDSS
               return as one stack element the list of WORD in DICT separated by a |

   VVAARRSS
               return as one stack element the list of VARS  separated by a |

   IINNCC
               incremente (+ 1) the value of the variable on the statck

   DDEECC
               decremente (- 1) the value of the variable on the statck

   VVAARRIIAABBLLEE xxxxxx
              deckare the variable 'xxx' (reserve memory)

   xxxx vvaarr !!
               set the value xx to the variable 'var'

   xx11 xx22 xx33 ...... nn vvaarr !!!!
               put and delete 'n' element(s) from the stack in the variable 'var'
               'n' is in absolute value

   xx11 xx22 xx33 ...... nn vvaarr !!!!CC
               copy 'n' element(s) from the stack in the variable 'var'
               'n' is in absolute value

   xx11 xx22 xx33 ...... bb aa vvaarr !!!!!!
               put and delete ' element(s) from the stack in the variable 'var'
               starting at element  'a' to element 'b'
               'a' and 'b' in absolute value
               if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)

   xx11 xx22 xx33 ...... bb aa vvaarr !!!!!!CC
               copy element(s) on the stack in the variable 'var'
               starting at element  'a' to element 'b'
               'a' and 'b' in absolute value
               if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)

   vvaarr @@
               return the value of the variable 'var'

   ::xxxxxx  nnaammee11 ;;
               create a new entry in the dictionary whith name name1 and store the progam xxx

   :: xxxxxx yyyyyy nnaammee11 PPEERRLL
               execute the PERL code
               with parameter(s) xxx yyy
               !!! be care if the perl code need to use a coma (,)
               you need to enclose the line inside double quote
               if you need double quote in code use qq{ ... }

   :: xxxxxx nnaammee11 PPEERRLLFFUUNNCC
               execute the PERL function name1 with the parameter xxx
               the default name space is "main::"
               It is possible tu use a specific name space
               the paramter are "stringified"
               e.g. ':,5,filename,save,PERLFUNC'
               call the function save("filename", 5);

   aa &gt;&gt;RR
               put 'a' on the return stack

   RR&gt;&gt;
              remove first element from the return stack and copy on the normal stack

   RRLL
              return the depth of the return stack

   RR@@
              copy return stack on normal stack

LLOOOOPP aanndd DDEECCIISSIIOONN ooppeerraattoorrss
       .

   aa IIFF xxxxxx TTHHEENN
               test the element on top of stack
                       if == 1 execute 'xxx' block

               The loop is executed always one time

   aa IIFF zzzzzz EELLSSEE xxxxxx TTHHEENN
               test the element on top of stack
                       if == 1 execute 'xxx' block
                       if != 1 execute 'zzz' block

               The loop is executed always one time

   BBEEGGIINN xxxxxx WWHHIILLEE zzzzzz RREEPPEEAATT
               execute 'xxx' block
               test the element on top of stack
                       if == 0 execute 'zzz' block and branch again at 'BEGIN'
                       if != 0 end the loop

               The loop is executed always one time

   eenndd ssttaarrtt DDOO,,bblloocckk,,LLOOOOPP
               process 'block' with iterator from value 'start' until 'end' value,with increment of 1;
               The iterator variable is the second value on the stack (start argument)

   eenndd ssttaarrtt iinnccrreemmeenntt DDOO,,bblloocckk,,++LLOOOOPP
               process 'block' with iterator from value 'start' untill 'end' value,with increment of 'increment'
               This allow rational or negative value
               The iterator variable is the second value on the stack (start argument)

UUsseeffuull ffuunnccttiioonnss ffoorr tthhee mmoodduullee ((nnoott rreellaatteedd ttoo tthhee RRPPNN llaanngguuaaggee))
       .  =head2  _r_p_n___e_r_r_o_r_(_)

               function which return the debug info from the calculation (like a division by 0)

   rrppnn__sseeppaarraattoorr(( ''sseepp'' ))
               function to set a specific separator for the returned stack (default = space)
               This is useful when the result of rpn() is use inside another rpn() call

OOPPEERRAATTOORRSS
            The operators get value from the stack and push the result on top
            In the following explanation, the stack is represented as a pair of brackets ()
            and each elements by a pair of square barcket []
            The left part is the state before evalutation
            and the right part is the state of the stack after evaluation

               Arithmetic operators
               ---------------------
                   +                   ([a][b])                ([a+b])
                   -                   ([a][b])                ([a-b])
                   *                   ([a][b])                ([a*b])
                   /                   ([a][b])                ([a/b])         Becare if division by null return a blank value
                   **                  ([a][b])                ([a**b])
                   1+                  ([a])                   ([a+1])
                   1-                  ([a])                   ([a-1])
                   2+                  ([a])                   ([a+2])
                   2-                  ([a])                   ([a-2])
                   MOD                 ([a][b])                ([a%b])
                   ABS                 ([a])                   ([ABS a])
                   INT                 ([a])                   ([INT a])
                   +-                  ([a])                   ([-a])
                   REMAIN              ([a])                   ([a- INT a])

               Rationnal operators
               -------------------
                   SIN                 ([a])                   ([SIN a])       Unit in radian
                   COS                 ([a])                   ([COS a])       Unit in radian
                   TAN                 ([a])                   ([TAN a])       Unit in radian
                   CTAN                ([a])                   ([CTAN a])      Unit in radian
                   LN                  ([a])                   ([LOG a])
                   EXP                 ([a])                   ([EXP a])
                   PI                                          ([3.14159265358979])

               Relational operator
               ----------------
                   &lt;                   ([a][b])                ([1]) if [a]&lt;[b] else ([0])
                   &lt;=                  ([a][b])                ([1]) if [a]&lt;=[b] else ([0])
                   &gt;                   ([a][b])                ([1]) if [a]&gt;[b] else ([0])
                   &gt;=                  ([a][b])                ([1]) if [a]&gt;=[b] else ([0])
                   ==                  ([a][b])                ([1]) if [a]==[b] else ([0])
                   &lt;=&gt;                 ([a][b])                ([-1]) if [a]&gt;[b],([1]) if [a]&lt;[b], ([0])if [a]==[b]
                   !=                  ([a][b])                ([0]) if [a]==[b] else ([1])
                   TRUE                ([a])                   Return 1 if [a]&gt;0 and exist
                   FALSE               ([a])                   Return 0 if [a]&gt;0

               Logical operator
               ----------------

                   OR                  ([a][b])                ([1]) if [a] or [b] &gt;0
                   AND                 ([a][b])                ([1]) if [a] and [b] &gt;0
                   XOR                 ([a][b])                ([1]) if [a] and [b] are &gt;0 or ==0
                   NOT                 ([a])                   Return 0 if [a]&gt;0, Return 1 if[a]==0,

               Other operator
               ----------------

                   &gt;&gt;                  ([a][b])                shift to the right the bits from [a] of [b] rank
                   &lt;&lt;                  ([a][b])                shift to the left the bits from [a] of [b] rank
                   MIN                 ([a][b])                ([a]) if  [a]&lt;[b] else ([b])
                   MAX                 ([a][b])                ([a]) if  [a]&gt;[b] else ([b])
                   LOOKUP              ([a] V R [ope] )        test [ a ] on all value of array V with the operator [ope]
                                                               if succeed, return the value from array R at the succesfull indice
                   LOOKUPP             ([a] V R [ope] )        test [ a ] on all value of array V with the perl operator [ope]
                                                               if succeed, return the value from array R at the succesfull indice
                   LOOKUPOP            ([a] V R O] )           test [ a ] on all value of array V with the operator from the array OPE with the same indice
                   LOOKUPOPP           ([a] V R O] )           test [ a ] on all value of array V with the perl operator from the array OPE with the same indice
                                                               if succeed, return the value from array R at the succesfull indice
                   TICK                ()                      ([time]) time in ticks
                   LTIME               ([a])                   ([min][hour][day_in_the_month][month][year][day_in_week][day_year][daylight_saving]
                                                               localtime of [a] like PERL
                   GTIME               ([a])                   ([min][hour][day_in_the_month][month][year][day_in_week][day_year][daylight_saving]
                                                               ([a]) gmtime of [a] like PERL
                   HLTIME              ([a])                   ([a]) localtime human readeable
                   HGTIME              ([a])                   gmtime human readeable
                   RAND                ()                      ([rand]) a random numder between 0 and 1
                   LRAND               ([a])                   ([rand]) a random numder between 0 and [a]
                   SPACE               ([a])                   Return [a] with space between each 3 digits
                   DOT                 ([a])                   Return [a] with dot (.) between each 3 digits
                   NORM                ([a])                   Return [a] normalized by 1000 (K,M,G = 1000 * unit)
                   NORM2               ([a])                   Return [a] normalized by 1000 (K,M,G = 1024 * unit)
                   OCT                 (|a|)                   Return the DECIMAL value from HEX,OCTAL or BINARY value |a| (see oct from perl)
                   OCTSTR2HEX          (|a|)                   Return a HEX string from a OCTETSTRING
                   OCTSTR2HEX          (|a|)                   Return a OCTETSTRING string from a HEX
                   DDEC2STR            (|a|)                   Return a string from a dotted DEC string
                   STR2DDEC            (|a|)                   Return a dotted DEC string to a string

               String operators
               ----------------
                   EQ                  ([a][b])                ([1]) if [a] eq [b] else ([0])
                   NE                  ([a][b])                ([1]) if [a] ne [b] else ([0])
                   LT                  ([a][b])                ([1]) if [a] lt [b] else ([0])
                   GT                  ([a][b])                ([1]) if [a] gt [b] else ([0])
                   LE                  ([a][b])                ([1]) if [a] le [b] else ([0])
                   GE                  ([a][b])                ([1]) if [a] ge [b] else ([0])
                   CMP                 ([a][b])                ([-1]) if [a] gt [b],([1]) if [a] lt [b], ([0])if [a] eq [b]
                   LEN                 ([a])                   ([LENGTH a])
                   CAT                 ([a][b])                ([ab])  String concatenation
                   CATALL              ([a][b]...[z])          ([ab...z]) String concatenation of all elements on the stack
                   REP                 ([a][b])                ([a x b]) repeat [b] time the motif [a]
                   REV                 ([a])                   ([REVERSE a])
                   SUBSTR              ([a][b][c])             ([SUBSTR [a], [b], [c]) get substring of [a] starting from [b] untill [c]
                   UC                  ([a])                   ([UC a])
                   LC                  ([a])                   ([LC a])
                   UCFIRST             ([a])                   ([UCFIRST a])
                   LCFIRST             ([a])                   ([LCFIRST a])
                   PAT                 ([a][b])                ([r1]...) use the pattern [b] on the string [a] and return result
                                                               if more then one result like $1, $2 ... return all the results
                   PATI                ([a][b])                ([r1]...) use the pattern CASE INSENSITIVE [b] on the string [a] and return result
                                                               if more then one result like $1, $2 ... return all the results
                   TPAT                ([a][b])                ([r]) use the pattern [b] on the string [a] and return 1 if pattern macth
                                                               otherwise return 0
                   TPATI               ([a][b])                ([r]) use the pattern CASE INSENSITIVE [b] on the string [a] and return 1 if pattern macth
                                                               otherwise return 0
                   SPLIT               ([a][b])                split ([a]) using the pattern ([b]) and return all elements on stack
                   SPLITI                                      split ([a]) using the pattern CASE INSENSITIVE  ([b])) and return all elements on stack
                   SPAT                ([a][b][c])             Do a pattern subsititution following this rule I&lt;[c] =~s/[a]/[b]/&gt;
                   SPATG               ([a][b][c])             Do a pattern subsititution following this rule I&lt;[c] =~s/[a]/[b]/g&gt;
                   SPATI               ([a][b][c])             Do a pattern subsititution following this rule I&lt;[c] =~s/[a]/[b]/i&gt;
                                                               (case insensitive)
                   SPATGI              ([a][b][c])             Do a pattern subsititution following this rule I&lt;[c] =~s/[a]/[b]/gi&gt;
                                                               (case insensitive)
                   PRINTF              ([a][b]...[x])          use the format present in [a] to print the value [b] to [x]
                                                               the format is the same as (s)printf
                   PACK                ([a][b]...[x])          Do an unpack on variable [b] to [x] using format [b]
                   UNPACK              ([a][b])                Do an unpack on variable [b] using format [a]

                   ISNUM               ([a])                   Test if a is a NUMBER return 1 if success ( [a] [1|0] )
                                                               Keep the value on the stack
                   ISNUMD              ([a])                   Test if a is a NUMBER return 1 if success ( [1|0] )
                                                               Remove the value from the stack
                   ISINT               ([a])                   Test if a is a INTEGER (natural number )
                                                               Return 1 if success ( [a] [1|0] )
                                                               Keep the value on the stack
                   ISINTD              ([a])                   Test if a is a INTEGER (natural number )
                                                               Return 1 if success ( [1|0] )
                                                               Remove the value from the stack
                   ISHEX               ([a])                   Test if a is a HEXADECIMAL (hex starting with 0x or 0X or # )
                                                               Return 1 if success ( [a] [1|0] )
                                                               Keep the value on the stack
                   ISHEXD              ([a])                   Test if a is a HEXADECIMAL (hex starting with 0x or 0X or # )
                                                               Return 1 if success ( [1|0] )
                                                               Remove the value from the stack


                Stack operators
                ---------------

                   SWAP                ([a][b])                ([b][a])
                   OVER                ([a][b])                ([a][b][a])
                   DUP                 ([a])                   ([a][a])
                   DDUP                ([a][b])                ([a][b][a][b])
                   ROT                 ([a][b][c])             ([b][c][a])
                   RROT                ([a][b][c])             ([c][a][b])
                   DEPTH               ([r1]...)               ([re1]...[nbr]) Return the number of elements in the statck
                   POP                 ([a][b])                ([a])
                   POPN                ([a][b][c]...[x])       ([l]...[x]) remove [b] element from the stack (starting at [c])
                   SWAP2               ([a][b][c])             ([a][c][b])
                   ROLL                ([a][b][c][d][e][n])    ([a][c][d][e][b]) rotate the [n] element of the stack (here [n]=4)
                                                               if  [n] =3 it is equivalent to ROT
                   PICK                ([a][b][c][d][e][n])    ([a][b][c][d][e][b]) copy element from depth [n] on top
                   GET                 ([a][b][c][d][e][n])    ([a][b][c][d][e][b]) get element from depth [n] and put on top
                   PUT                 ([a][b][c][d][v][n])    ([a][v][b][c][d]) put element [v] at level [n] (here [n]=3)
                   DEL                 ([a][b])                delete [b] element on the stack from level [a]
                                                               [a] and [b] is get in absolute value
                   KEEPN               ([a][b])                keep [b] element(s) on the stack from level [a]
                                                               (and delete all other elements)
                                                               [a] and [b] is get in absolute value
                   PRESERVE            ([a][b])                keep element(s) on the stack from level [a] to level [b]
                                                               (and delete all other elements)
                                                               [a] and [b] is get in absolute value
                   COPY                ([a][b])                copy element(s) on the stack from level [a] to level [b]
                                                               [a] and [b] is get in absolute value
                   FIND                ([a])                   get the level of stack containing [a]
                   SEARCH              ([a])                   get the level of stack containing the REGEX [a]
                   SEARCHI             ([a])                   get the level of stack containing the REGEX [a] ( case insensitive )
                   SEARCHK             ([a])                   keep only level of stack matching the REGEX [a]
                   SEARCHIK            ([a])                   keep only level of stack matching the REGEX [a] ( case insensitive )
                   KEEP                ([a][b][c][d][e][n])    remove all elements of the stack except the element at deepth |n|

                Dictionary operators
                --------------------

                   WORDS               ()                              ([a])return as one stack element the list of WORD in DICT separated by a |
                   VARS                ()                              ([a])return as one stack element the list of VARIABLE in VAR separated by a |
                   INC                 ([a])                           () increment (+1) the value of variable [a]
                   DEC                 ([a])                           () decrement (-1) the value of variable [a]
                   VARIABLE            ([a])                           () create a entry in VAR for the variable [a]
                   !                   ([a][b])                        store the value [a] in the variable [b]
                   !!                  ([a][b][c]...[n] [var])         put and delete 'n' element(s) from the stack in the variable 'var'
                                                                       'n' is in absolute value
                   !!C                 ([a][b][c]...[n] [var])         copy 'n' element(s) from the stack in the variable 'var'
                                                                       'n' is in absolute value
                   !!!                 ([a][b][c]...[n1] [n2] [var])   put and delete element(s) from the stack in the variable 'var'
                                                                       starting at element  'a' to element 'b'
                                                                       'a' and 'b' in absolute value
                                                                       if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)
                   !!!C                        ([a][b][c]...[n] [var]) copy 'element(s) from the stack in the variable 'var'
                                                                       starting at element  'a' to element 'b'
                                                                       'a' and 'b' in absolute value
                                                                       if 'a' &gt; 'b'  keep the reverse of selection (boustrophedon)
                   @                   ([a])                           ([a]) return the value of the variable [a]
                   : xxx yyy ;                                         create a new word (sub) into the dictionary with the xxx "code" and name yyy
                   : xxx yyy PERLFUNC                                  execute the PERL function yyy with parameter(s) yyy
                                                                       the default name space is "main::"
                                                                       It is possible tu use a specific name space
                   : xxx yyy PERL                                      execute the PERL code xxx ; yyy

                Return Stack operators
                ----------------------

                  &gt;R                   ([a])                   put ^a$ on the return stack
                  R&gt;                   ()                      remove first element from the return stack and copy on the normal
                  RL                   ()                      return the depth of the return stack
                  R@                   ()                      copy return stack ion normal stack

               LOOP and DECISION operators
               ---------------------------

                [a] IF [..xxx] THEN                            Test the element on top of stack
                                                                 if ==0, execute 'xxx' block
                                                               The loop is executed always one time

                [a] IF [...zzz...] ELSE [..xxx...] THEN        Test the element on top of stack
                                                                 if ==0, execute 'xxx' block
                                                                 if != 0 execute 'zzz' block
                                                               The loop is executed always one time

                BEGIN xxx WHILE zzz REPEAT                     Execute 'xxx' block
                                                               Test the element on top of stack
                                                                 if ==0 execute 'zzz' block and branch again to BEGIN
                                                                 if != 0 end the loop
                                                               The loop is executed always one time

               [a] [b] DO [...xxx...] LOOP     ([a][b])        process block [...xxx...] with iterator from value [b] untill [a] value,
                                                               with increment of 1;
                                                               The iterator variable is '_I_' (read only and scoop only the DO ... LOOP block)

               [a] [b] DO [...xxx...] [c] +LOOP        ([a][b])        process block [...xxx...] with iterator from value [b] untill [a] value,
                                                               with increment of [c];
                                                               The iterator variable is '_I_' (read only and scoop only the DO ... LOOP block)

EEXXAAMMPPLLEESS
               use Parse::RPN;

               $test ="3,5,+";
               $ret = rpn($test);  # $ret = 8

               $test = "Hello World,len,3,+";
               $ret = rpn($test);  # $ret = 14

               $test = "'Hello,World',len,3,+";
               $ret = rpn($test);  # $ret = 14

               $test = "'Hello,World,len,3,+";
               ---------^-----------^-
               $ret = rpn($test);  # $ret = 8 with a warning because the stack is not empty ([Hello] [8])
                                   # be care to close your quoted string

               $test = "'Hello world','or',PAT,'or',EQ,IF,'string contain or',ELSE,'No or in string',THEN"
               $ret = rpn($test);  # $ret = "Contain a coma"

               $test = "'Hello world','or',TPAT,IF,'string contain or',ELSE,'No or in string',THEN";
               $ret = rpn($test);  # $ret = "string contain or"


               $test = "3,10,/,5,+,82,*,%b,PRINTF";
               $ret = rpn($test);  # $ret = "110110010"

               $test = "3,10,/,5,+,82,*,%016b,PRINTF";
               $ret = rpn($test);  # $ret = "0000000110110010"

               $test = "55,N,pack,B32,unpack,^0+(?=\d), ,spat,'+',ds";
               $ret = rpn($test);  # $ret = 110111

               $test = "7,3,/,10,3,/,%d %f,PRINTF";
               @ret = rpn($test); # @ret = 2 3.333333

               $test = "VARIABLE,a,0,a,!,##,b,BEGIN,bbbb,a,INC,a,@,4,&lt;,WHILE,####,a,@,****,REPEAT";
               @ret =rpn($test); # @ret = ## b bbbb #### 1 **** bbbb #### 2 **** bbbb #### 3 **** bbbb

               $test = "VARIABLE,a,0,a,!,z,0,5,-1,DO,a,INC,6,1,2,DO,A,_I_,+LOOP,#,+LOOP,##,a,@";
               @ret =rpn($test); # @ret = z A 3 A 5 A 7 # A 3 A 5 A 7 # A 3 A 5 A 7 # A 3 A 5 A 7 # A 3 A 5 A 7 # A 3 A 5 A 7 # ## 6

               $test = "1,2,3,4,5,6,7,8,9,3,KEEP";
               ret =rpn($test); # @ret = 7

               $test = "1,2,3,4,5,6,7,8,9,30,KEEP";
               ret =rpn($test); # @ret = 1,2,3,4,5,6,7,8,9

               $test = "h,g,f,e,d,c,b,a,4,3,DEL";
               ret =rpn($test); # @ret = h,c,b,a

               $test = "h,g,f,e,d,c,b,a,4,3,KEEPN"";
               ret =rpn($test); # @ret = g,f,e,d

               sub Test {
                  my $a  = shift;
                  my $b = shift;
                  my $c = $a/$b;
                  print "a=$a\tb=$b\ttotal=$c\n";
                  return $c;
               }
               $test = ":,5,6,Test,PERLFUNC";
               @ret =rpn($test); # call the function "Test" from the main package (the caller) with parameter 5,6 and return result (in @ret)

               $test = ":,05,11,01,0,0,0,Time::Local::timelocal,PERLFUNC";
               @ret =rpn($test); # @ret = 1133391600

               $test = "1,2,3,+,:, my $b=7, "open LOG , qq{ &gt;/tmp/log }",print LOG time,PERL";
               @ret =rpn($test); # @ret = 1,5
               and the file /tmp/log contain a line with the tick time.

               $test = "11,55,*,5,2,401,+,:,my $b=,SWAP,CAT, "open LOG , qq{ &gt;/tmp/log }",print LOG $b.qq{ \n },PERL"
               @ret =rpn($test); # @ret =1 2 3 1 (the latest 1 is the succes result return)
               and the file /tmp/log contain a line with 403 + a cariage return

               $test = 'mb,tb,gb,mb,kb,4,V,!!,12,9,6,3,4,R,!!,V,R,"TPATI",LOOKUP'
               @ret =rpn($test); # @ret = 6

               $test = '5,1,2,3,4,5,5,V,!!," "," ",ok," ",nok,5,R,!!,V,R,"&lt;=",LOOKUPP'
               @ret =rpn($test); # @ret = nok

               $test = '3,1,2,3,4,5,5,V,!!,a,b,ok,d,nok,5,R,!!,"&lt;","&lt;","&lt;","&lt;","&lt;",5,O,!!,V,R,O,LOOKUPOPP'
               @ret =rpn($test); # @ret = d

               The small tool 'RPN.pl' provide an easy interface to test quickly an RPN.
               This include two test functions named 'save' and 'restore'
               Try RPN.pl to get a minimal help.
               Take a look to the minimalistic code, and put RPN.pl in your path.

               Sample of use:
               RPN.pl -r '1,2,3,:,123,100,+,7,*,test,save,PERLFUNC'
               save in file '/tmp/test' the value '1561' (whithout CR/LF) and return 1 2 3 1

AAUUTTHHOORR
               Fabrice Dulaunoy &lt;fabrice@dulaunoy.com&gt;
               It is a full rewrite from the version 1.xx to allow DICTIONNARY use
               and STRUCTURE control
               Thanks to the module Math::RPN from  Owen DeLong, &lt;owen@delong.com&gt;
               for the idea of using RPN in a config file

SSEEEE AALLSSOO
               Math-RPN from  Owen DeLong, &lt;owen@delong.com&gt;

TTOODDOO
               Error processing, stack underflow...

CCRREEDDIITTSS
               Thank's to Stefan Moser &lt;sm@open.ch&gt; for the idea
               to call a perl function from the rpn() and also for pin-pointing an error in stack return.

LLIICCEENNSSEE
               Under the GNU GPL2

               This program is free software; you can redistribute it and/or modify it
               under the terms of the GNU General Public
               License as published by the Free Software Foundation; either version 2
               of the License, or (at your option) any later version.

               This program is distributed in the hope that it will be useful,
               but WITHOUT ANY WARRANTY;  without even the implied warranty of
               MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
               See the GNU General Public License for more details.

               You should have received a copy of the GNU General Public License
               along with this program; if not, write to the
               Free Software Foundation, Inc., 59 Temple Place,
               Suite 330, Boston, MA 02111-1307 USA

               Parse::RPN   Copyright (C) 2004 2005 2006 2007 DULAUNOY Fabrice
               Parse::RPN comes with ABSOLUTELY NO WARRANTY;
               for details See: L&lt;http://www.gnu.org/licenses/gpl.html&gt;
               This is free software, and you are welcome to redistribute
               it under certain conditions;



perl v5.10.0                      2009-03-13                     Parse::RPN(3)
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