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| author | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
|---|---|---|
| committer | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
| commit | 27e183a78c8062ed7c2bbb91655a5e56cd697bba (patch) | |
| tree | 88fd355a0cc6da4c130582e092d702836596cbb2 /examples/excelExpr.py | |
| parent | 4ba589cf13588e90992e23deb5a9784340efd2cc (diff) | |
| download | pyparsing-git-27e183a78c8062ed7c2bbb91655a5e56cd697bba.tar.gz | |
Move src to root
Diffstat (limited to 'examples/excelExpr.py')
| -rw-r--r-- | examples/excelExpr.py | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/examples/excelExpr.py b/examples/excelExpr.py new file mode 100644 index 0000000..7ce8db2 --- /dev/null +++ b/examples/excelExpr.py @@ -0,0 +1,69 @@ +# excelExpr.py
+#
+# Copyright 2010, Paul McGuire
+#
+# A partial implementation of a parser of Excel formula expressions.
+#
+from pyparsing import (CaselessKeyword, Suppress, Word, alphas,
+ alphanums, nums, Optional, Group, oneOf, Forward, Regex,
+ infixNotation, opAssoc, dblQuotedString, delimitedList,
+ Combine, Literal, QuotedString, ParserElement, pyparsing_common)
+ParserElement.enablePackrat()
+
+EQ,LPAR,RPAR,COLON,COMMA = map(Suppress, '=():,')
+EXCL, DOLLAR = map(Literal,"!$")
+sheetRef = Word(alphas, alphanums) | QuotedString("'",escQuote="''")
+colRef = Optional(DOLLAR) + Word(alphas,max=2)
+rowRef = Optional(DOLLAR) + Word(nums)
+cellRef = Combine(Group(Optional(sheetRef + EXCL)("sheet") + colRef("col") +
+ rowRef("row")))
+
+cellRange = (Group(cellRef("start") + COLON + cellRef("end"))("range")
+ | cellRef | Word(alphas,alphanums))
+
+expr = Forward()
+
+COMPARISON_OP = oneOf("< = > >= <= != <>")
+condExpr = expr + COMPARISON_OP + expr
+
+ifFunc = (CaselessKeyword("if") -
+ LPAR +
+ Group(condExpr)("condition") +
+ COMMA + Group(expr)("if_true") +
+ COMMA + Group(expr)("if_false") + RPAR)
+
+statFunc = lambda name : Group(CaselessKeyword(name) + Group(LPAR + delimitedList(expr) + RPAR))
+sumFunc = statFunc("sum")
+minFunc = statFunc("min")
+maxFunc = statFunc("max")
+aveFunc = statFunc("ave")
+funcCall = ifFunc | sumFunc | minFunc | maxFunc | aveFunc
+
+multOp = oneOf("* /")
+addOp = oneOf("+ -")
+numericLiteral = pyparsing_common.number
+operand = numericLiteral | funcCall | cellRange | cellRef
+arithExpr = infixNotation(operand,
+ [
+ (multOp, 2, opAssoc.LEFT),
+ (addOp, 2, opAssoc.LEFT),
+ ])
+
+textOperand = dblQuotedString | cellRef
+textExpr = infixNotation(textOperand,
+ [
+ ('&', 2, opAssoc.LEFT),
+ ])
+
+expr << (arithExpr | textExpr)
+
+
+(EQ + expr).runTests("""\
+ =3*A7+5
+ =3*Sheet1!$A$7+5
+ =3*'Sheet 1'!$A$7+5"
+ =3*'O''Reilly''s sheet'!$A$7+5
+ =if(Sum(A1:A25)>42,Min(B1:B25),if(Sum(C1:C25)>3.14, (Min(C1:C25)+3)*18,Max(B1:B25)))
+ =sum(a1:a25,10,min(b1,c2,d3))
+ =if("T"&a2="TTime", "Ready", "Not ready")
+""")
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