93 lines
1.5 KiB
V
93 lines
1.5 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module csv
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import strings
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struct Writer {
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mut:
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sb strings.Builder
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pub mut:
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use_crlf bool
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delimiter byte
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}
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pub fn new_writer() &Writer {
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return &Writer{
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delimiter: `,`,
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sb: strings.new_builder(200)
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}
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}
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// write writes a single record
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pub fn (mut w Writer) write(record []string) ?bool {
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if !valid_delim(w.delimiter) {
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return err_invalid_delim
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}
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le := if w.use_crlf { '\r\n' } else { '\n' }
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for n, _field in record {
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mut field := _field
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if n > 0 {
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w.sb.write(w.delimiter.str())
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}
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if !w.field_needs_quotes(field) {
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w.sb.write(field)
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continue
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}
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w.sb.write('"')
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for field.len > 0 {
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mut i := field.index_any('"\r\n')
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if i < 0 {
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i = field.len
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}
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w.sb.write(field[..i])
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field = field[i..]
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if field.len > 0 {
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z := field[0]
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match z {
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`"` {
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w.sb.write('""')
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}
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`\r`, `\n` {
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w.sb.write(le)
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}
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else {}
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}
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field = field[1..]
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}
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}
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w.sb.write('"')
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}
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w.sb.write(le)
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return true
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}
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// Once we have multi dimensional array
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// pub fn (w &Writer) write_all(records [][]string) {
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// for _, record in records {
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// w.write(record)
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// }
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// }
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fn (w &Writer) field_needs_quotes(field string) bool {
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if field == '' {
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return false
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}
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if field.contains(w.delimiter.str()) || (field.index_any('"\r\n') != -1) {
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return true
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}
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return false
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}
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pub fn (mut w Writer) str() string {
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return w.sb.str()
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}
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