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Don't parse if there are no flags.

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This commit is contained in:
Erik C. Thauvin 2021-10-16 02:25:04 -07:00
parent fd3661b21b
commit edb77726f1
4 changed files with 71 additions and 49 deletions
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106
lib/dcat.dart
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@ -120,64 +120,78 @@ Future<void> _writeStream(
bool showNonPrinting) async {
const tab = 9;
int squeeze = 0;
final noFlags = !showEnds &&
!showLineNumbers &&
!numberNonBlank &&
!showTabs &&
!squeezeBlank &&
!showNonPrinting;
final sb = StringBuffer();
await stream.forEach((data) {
sb.clear();
for (final ch in utf8.decode(data).runes) {
if (lastLine.lastChar == _lineFeed) {
if (squeezeBlank) {
if (ch == _lineFeed) {
if (squeeze >= 1) {
lastLine.lastChar = ch;
if (noFlags) {
sb.writeCharCode(ch);
} else {
if (lastLine.lastChar == _lineFeed) {
if (squeezeBlank) {
if (ch == _lineFeed) {
if (squeeze >= 1) {
lastLine.lastChar = ch;
continue;
}
squeeze++;
} else {
squeeze = 0;
}
}
if (showLineNumbers || numberNonBlank) {
if (!numberNonBlank || ch != _lineFeed) {
sb
..write('${++lastLine.lineNumber}'.padLeft(6))
..write('\t');
}
}
}
lastLine.lastChar = ch;
if (ch == _lineFeed) {
if (showEnds) {
sb.write('\$');
}
} else if (ch == tab) {
if (showTabs) {
sb.write('^I');
continue;
}
} else if (showNonPrinting) {
if (ch >= 32) {
if (ch < 127) {
// ASCII
sb.writeCharCode(ch);
continue;
} else if (ch == 127) {
// NULL
sb.write('^?');
continue;
} else {
// UNICODE
sb
..write('U+')
..write(ch.toRadixString(16).padLeft(4, '0').toUpperCase());
continue;
}
squeeze++;
} else {
squeeze = 0;
}
}
if (showLineNumbers || numberNonBlank) {
if (!numberNonBlank || ch != _lineFeed) {
sb.write('${++lastLine.lineNumber}'.padLeft(6) + '\t');
sb
..write('^')
..writeCharCode(ch + 64);
continue;
}
}
sb.writeCharCode(ch);
}
lastLine.lastChar = ch;
if (ch == _lineFeed) {
if (showEnds) {
sb.write('\$');
}
} else if (ch == tab) {
if (showTabs) {
sb.write('^I');
continue;
}
} else if (showNonPrinting) {
if (ch >= 32) {
if (ch < 127) {
// ASCII
sb.writeCharCode(ch);
continue;
} else if (ch == 127) {
// NULL
sb.write('^?');
continue;
} else {
// UNICODE
sb.write('U+' + ch.toRadixString(16).padLeft(4, '0').toUpperCase());
continue;
}
} else {
sb
..write('^')
..writeCharCode(ch + 64);
continue;
}
}
sb.writeCharCode(ch);
}
if (sb.isNotEmpty) {
out.write(sb);
}
});
}
}