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annotate parse.py @ 25:a5125a2e77ea

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towards inverted map of refs
author Henry S. Thompson <ht@markup.co.uk>
date Thu, 06 Apr 2017 18:31:46 +0100
parents 263a1935d37d
children e500d7c18aad
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ''' Tokenise Excel formulae
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2 Starting from regexps and concat rules in
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3 https://sites.google.com/site/e90e50/random-topics/tool-for-parsing-formulas-in-excel
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4 and
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5 parser_formule_with_textbox_v01_2003.xla
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6 linked to therein'''
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7
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8 import sys,re
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9
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10 cw = "=\-+*/();:,.$<>^!"
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11 #cWW = "[=\-+*/();:,.$<>^]"
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12
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13 sListSeparator = ","
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14 sRowSeparator = ";"
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15
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16 # If comma is decimal symbol, then \ is used in place of comma in Array.
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17 # If semi-colon is decimal symbol, then \ is used in place of semi-colon
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18 # in Array. (Semi-colon is row separator)
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19 # See https://www.ablebits.com/office-addins-blog/2015/02/25/array-formulas-functions-excel/
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20
1
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21 pats=["\"[^\"]*\"",
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22 "\{[^}]+}",
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23 sListSeparator,
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24 "[^" + cw + "]+(?:\.[^" + cw + "]+)*\\(",
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25 "\\)",
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26 "^=|\\(",
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27 "'[^']+'",
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28 "\$?[A-Z]+\$?[0-9]+",
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29 "[a-zA-Z_\\\\][a-zA-Z0-9._]*",
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30 "."]
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31
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32 ## They perform the following tasks, in order:
1
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33 ## 1. Represents a text (delimited by double quotes)
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34 ## 2. Represents a constant matrix
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35 ## 3. Represents a list (function parameter) separator
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36 ## 4. Represents a function name followed by an opening parenthesis
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37 ## 5. Represents a closing parenthesis
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38 ## 6. Represents the beginning of the formula or an opening
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39 ## parenthesis (not part of a function)
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40 ## 7. A sheet name (delimited by single quotes) and a !
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41 ## 8. A cell reference
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42 ## 9. A name
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43 ## 10. Each characters not matched by the previous patterns
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44
2
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45 # As it stands this combines operators with following refs or vars
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46 # Should we try ref="\$?[A-Z]+\$?[0-9]+" and var=[a-zA-Z_\\][a-zA-Z0-9._]* ?
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47 # (suitably int'lised)
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48
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49 tokPat=re.compile("("+(")|(".join(pats))+")",re.IGNORECASE)
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50
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51 f="""=IF(I$1>$C$2,VLOOKUP($C52,GP_input!$C$187:$CM$196,VLOOKUP($C$9,lists!$A$34:$B$39,2,FALSE)+BC$4,FALSE),SUMIF('BEX2011'!$C$32:$C$5000,$B$9&"sl"&$B52&$C52&$B53,'BEX2001'!Q$32))"""
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52
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53 l=tokPat.findall(f)
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54
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55 ## Visual basic code:
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56 ## set M = RE.Execute(s)
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57 ## s = ""
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58 ## For Each SM In M
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59 ## Set SB = SM.SubMatches
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60 ## If Len(SB(0) & SB(6)) Then
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61 ## t = SB(0) & SB(6) [HST doesn't understand why atoms
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62 ## and strings are concatenated]
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63 ## ElseIf Len(SB(1)) Then
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64 ## t = Array_Const_Wrap(SB(1), sRowSeparator) & vbCr
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65 ## ElseIf Len(SB(2) & SB(5)) Then
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66 ## t = SB(2) & SB(5) & vbCr
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67 ## ElseIf Len(SB(3)) Then
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68 ## t = vbCr & SB(3) & vbCr
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69 ## ElseIf Len(SB(4)) Then
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70 ## t = vbCr & SB(4)
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71 ## End If
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72 ## s = s & t
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73 ## Next
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74
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75 def mergeMatches(l):
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76 res=""
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77 rtype=None
0
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78 cur=""
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79 for txt,cm,sep,ofun,close,opn,sheet,ref,var,misc in l:
0
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80 if txt is not '':
1
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81 if res is not '' and rtype is not 1:
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82 yield res
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83 rtype=1
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84 res=''
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85 res+=txt
1
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86 rtype=1
0
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87 continue
2
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88 if misc is not '':
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89 if res is not '' and rtype is not 2:
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90 yield res
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91 rtype=2
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92 res=''
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93 res+=misc
1
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94 rtype=2
0
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95 continue
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96 if cm is not '':
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97 cur=cm
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98 elif sep is not '':
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99 cur=sep
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100 elif ofun is not '':
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101 cur=ofun
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102 elif close is not '':
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103 cur=close
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104 elif opn is not '':
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105 cur=opn
2
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106 elif sheet is not '':
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107 cur=sheet
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108 elif ref is not '':
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109 cur=ref
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110 elif var is not '':
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111 cur=var
0
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112 if res is not '':
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113 yield res
1
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114 rtype=None
0
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115 res=''
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116 yield cur
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117
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118 toks=list(mergeMatches(l))
2
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119 print (''.join(toks))==f