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[trep-engine] faster csv list processing

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instead of scanning the row 5 times: (length, make-list, append, map,
string-join), walk the list once building the accumulator along the way.
This commit is contained in:
Christopher Lam 2022-02-28 09:23:24 +08:00
parent c642980456
commit c3883e703b
1 changed files with 17 additions and 7 deletions
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24
gnucash/report/trep-engine.scm
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@ -470,18 +470,28 @@ in the Options panel."))
str)
(display #\" port))))
(define max-items (apply max (map length lst)))
(define max-items
(let lp ((lst lst) (maximum 0))
(cond
((null? lst) maximum)
((pair? lst) (lp (cdr lst) (max maximum (length (car lst)))))
(else (error "strify " lst " must be a proper list")))))
(define (strify obj)
(cond
((not obj) "")
((or (null? obj) (not obj)) "")
((string? obj) (string-sanitize-csv obj))
((number? obj) (number->string (exact->inexact obj)))
((list? obj) (string-join
(map strify
(append obj
(make-list (- max-items (length obj)) #f)))
","))
((pair? obj) (let lp ((row obj) (acc '()) (pad max-items))
(cond
((zero? pad) (string-concatenate-reverse acc))
((null? row) (lp '() (cons "," acc) (1- pad)))
((pair? row) (lp (cdr row)
(cons* (if (pair? (cdr row)) "," "")
(strify (car row))
acc)
(1- pad)))
(else (error "strify " obj " must be a proper list")))))
((gnc:gnc-monetary? obj) (strify (gnc:gnc-monetary-amount obj)))
(else (object->string obj))))