From 8132d580811c30b7266f1a2c4d51b8bb4743dbdc Mon Sep 17 00:00:00 2001 From: retropikzel Date: Wed, 5 Nov 2025 22:49:16 +0200 Subject: [PATCH] Add csv library --- Makefile | 2 +- retropikzel/csv.scm | 150 ++++++++++++++++++++++++++++++++ retropikzel/csv.sld | 10 +++ retropikzel/csv/LICENSE | 165 ++++++++++++++++++++++++++++++++++++ retropikzel/csv/README.html | 1 + retropikzel/csv/README.md | 2 + retropikzel/csv/VERSION | 1 + 7 files changed, 330 insertions(+), 1 deletion(-) create mode 100644 retropikzel/csv.scm create mode 100644 retropikzel/csv.sld create mode 100644 retropikzel/csv/LICENSE create mode 100644 retropikzel/csv/README.html create mode 100644 retropikzel/csv/README.md create mode 100644 retropikzel/csv/VERSION diff --git a/Makefile b/Makefile index 65f099c..84494aa 100644 --- a/Makefile +++ b/Makefile @@ -19,7 +19,7 @@ endif all: build -build: retropikzel/${LIBRARY}/LICENSE retropikzel/${LIBRARY}/VERSION +build: retropikzel/${LIBRARY}/LICENSE retropikzel/${LIBRARY}/VERSION retropikzel/${LIBRARY}/README.md echo "
$$(cat retropikzel/${LIBRARY}/README.md)
" > ${README} snow-chibi package --version=${VERSION} --authors=${AUTHOR} --doc=${README} --description="${DESCRIPTION}" ${LIBRARY_FILE} diff --git a/retropikzel/csv.scm b/retropikzel/csv.scm new file mode 100644 index 0000000..4471a01 --- /dev/null +++ b/retropikzel/csv.scm @@ -0,0 +1,150 @@ +(define string-util-replace-count + (lambda (text replace replace-with count) + (letrec* ((inner-count 0) + (looper (lambda (result text) + (if (or (string=? replace "") + (string=? text "") + (= (string-length text) 0) + (= inner-count count)) + (string-append result text) + (if (and (char=? (string-ref replace 0) (string-ref text 0)) + (>= (string-length text) (string-length replace)) + (string=? (string-copy text 0 (string-length replace)) + replace)) + (begin + (set! inner-count (+ inner-count 1)) + (looper (string-append result replace-with) + (string-copy text (string-length replace)))) + (looper (string-append result (string-copy text 0 1)) + (string-copy text 1))))))) + (looper "" text)))) + +(define string-util-contains? + (lambda (haystack needle) + (if (string=? needle "") + #f + (if (string=? haystack + (string-util-replace-count haystack + needle + "" + 1)) + #f + #t)))) + +(define string-util-replace-all + (lambda (text replace replace-with) + (letrec ((looper (lambda (result text) + (if (or (string=? replace "") + (string=? text "") + (= (string-length text) 0)) + result + (if (and (char=? (string-ref replace 0) (string-ref text 0)) + (>= (string-length text) (string-length replace)) + (string=? (string-copy text 0 (string-length replace)) + replace)) + (looper (string-append result replace-with) + (string-copy text (string-length replace))) + (looper (string-append result (string-copy text 0 1)) + (string-copy text 1))))))) + (looper "" text)))) + +(define read-until-char + (lambda (result port char) + (let ((c (read-char port))) + (cond + ((or (eof-object? c) + (eof-object? (peek-char port))) + (list->string (reverse result))) + ((and (not (char=? char #\")) + (char=? c #\return) + (char=? (peek-char port) #\newline)) + (list->string (reverse result))) + ((and (not (char=? char #\")) + (char=? (peek-char port) #\newline)) + (list->string (reverse (cons c result)))) + (else + ; When reading inside " read "" as " + (if (and (char=? char #\") + (char=? c #\") + (char=? (peek-char port) #\")) + (read-until-char (cons (read-char port) result) port char) + (if (char=? c char) + (list->string (reverse result)) + (read-until-char (cons c result) port char)))))))) +1 +(define csv->list ;-> obj + #| + Reads csv from given port and transforms it into list of list. + + Each row is a list inside list of rows. + |# + (lambda (delimiter port) + (csv->list-loop (list) (list) delimiter port))) + +(define csv->list-loop + (lambda (result line-list delimiter port) + (let* ((next-char (peek-char port))) + (if (eof-object? next-char) + (reverse result) + (csv->list-loop + (if (char=? next-char #\newline) + (begin + (read-char port) + (set! result (cons (reverse line-list) result)) + (set! line-list (list)) + result) + result) + (cond + ((char=? next-char #\return) + (read-char port) + line-list) + ((char=? next-char delimiter) + (read-char port) + line-list) + ((char=? next-char #\") + (read-char port) + (cons (read-until-char (list) port #\") line-list)) + (else (cons (read-until-char (list) port delimiter) line-list))) + delimiter port))))) + +(define (csv-from-list delimiter rows) ;-> string + #| Transform list of lists into CSV string |# + (let ((item-display + (lambda (item) + (let ((write? #f)) + (when (and (string? item) + (string-util-contains? item (string delimiter))) + (set! write? #t)) + (when (and (string? item) + (string-util-contains? item "\"")) + (set! item (string-util-replace-all item "\"" "\"\"")) + (set! write? #t)) + (when (and (string? item) + (= (string-length item) 0)) + (set! write? #t)) + (if write? + (write item) + (display item)))))) + (parameterize + ((current-output-port + (open-output-string))) + (for-each + (lambda (row) + (let ((index -1)) + (for-each + (lambda (item) + (set! index (+ index 1)) + (cond ((= index 0) (item-display item)) + (else (display ",") + (item-display item)))) + row)) + (newline)) + rows) + (get-output-string (current-output-port))))) + +(define csv-file->list + (lambda (character file-path) + (call-with-input-file + file-path + (lambda (csv-file-input-port) + (csv->list character csv-file-input-port))))) diff --git a/retropikzel/csv.sld b/retropikzel/csv.sld new file mode 100644 index 0000000..c0b9e34 --- /dev/null +++ b/retropikzel/csv.sld @@ -0,0 +1,10 @@ +(define-library + (retropikzel csv) + (import + (scheme base) + (scheme read) + (scheme char) + (scheme write) + (scheme file)) + (export csv->list csv-from-list csv-file->list) + (include "csv.scm")) diff --git a/retropikzel/csv/LICENSE b/retropikzel/csv/LICENSE new file mode 100644 index 0000000..0a04128 --- /dev/null +++ b/retropikzel/csv/LICENSE @@ -0,0 +1,165 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + + This version of the GNU Lesser General Public License incorporates +the terms and conditions of version 3 of the GNU General Public +License, supplemented by the additional permissions listed below. + + 0. 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If the Library as you +received it does not specify a version number of the GNU Lesser +General Public License, you may choose any version of the GNU Lesser +General Public License ever published by the Free Software Foundation. + + If the Library as you received it specifies that a proxy can decide +whether future versions of the GNU Lesser General Public License shall +apply, that proxy's public statement of acceptance of any version is +permanent authorization for you to choose that version for the +Library. diff --git a/retropikzel/csv/README.html b/retropikzel/csv/README.html new file mode 100644 index 0000000..87ce5ce --- /dev/null +++ b/retropikzel/csv/README.html @@ -0,0 +1 @@ +
CSV library for R7RS Schemes.
diff --git a/retropikzel/csv/README.md b/retropikzel/csv/README.md new file mode 100644 index 0000000..f4a1561 --- /dev/null +++ b/retropikzel/csv/README.md @@ -0,0 +1,2 @@ +CSV library for R7RS Schemes. + diff --git a/retropikzel/csv/VERSION b/retropikzel/csv/VERSION new file mode 100644 index 0000000..3eefcb9 --- /dev/null +++ b/retropikzel/csv/VERSION @@ -0,0 +1 @@ +1.0.0