Details
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New Feature
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Status: Resolved
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Minor
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Resolution: Fixed
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6.4.40
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None
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N/A
Description
Hi,
I've been demoing the Tomita variant of PARSE to my colleagues, using the calculator example in the ECL ref manual. I notice that you can assign the result from MATCHROW to DATASET(<record structure>) if said item is in the result rec, but not if the left-hand side of the expression is a standalone local DATASET.
PATTERN ws := [' ','\t']; TOKEN number := PATTERN('[0-9]+'); TOKEN plus := '+'; TOKEN minus := '-';attrRec := RECORD REAL val; END;RULE(attrRec) e0 := '(' USE(attrRec,expr)? ')' | number TRANSFORM(attrRec, SELF.val := (INTEGER)$1;) | '-' SELF TRANSFORM(attrRec, SELF.val := -$2.val;); RULE(attrRec) e1 := e0 | SELF '*' e0 TRANSFORM(attrRec, SELF.val := $1.val * $3.val;) | USE(attrRec, e1) '/' e0 TRANSFORM(attrRec, SELF.val := $1.val / $3.val;); RULE(attrRec) e2 := e1 | SELF plus e1 TRANSFORM(attrRec, SELF.val := $1.val + $3.val;) | SELF minus e1 TRANSFORM(attrRec, SELF.val := $1.val - $3.val;); RULE(attrRec) expr := e2;infile := DATASET([{'1+2*3'},{'1+2*z'},{'1+2+(3+4)*4/2'},{'2+1/2+1/6+1/24+1/120+1/720+1/5040'}],{ STRING line });resultsRec := RECORD DATASET(attrRec) ds; END;resultsRec extractResults(infile l, attrRec attr) := TRANSFORM // DATASET(attrRec) xxx := MATCHROW(e0); // Syntax failure if included SELF.ds := MATCHROW(e0); END;OUTPUT(PARSE(infile,line,expr,extractResults(LEFT, $1), FIRST,WHOLE,PARSE,SKIP(ws)));
So what's the difference between
DATASET(attrRec) xxx := MATCHROW(e0);
and
SELF.ds := MATCHROW(e0);
Yours
Allan
