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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "querycompleter.h"
namespace {
/// Whether the cursor sits inside a double-quoted literal. Counts quotes from
/// the start: an odd count before the cursor means the quote is still open.
bool insideQuotes(const QString &text, int cursor)
{
int quotes = 0;
for (int i = 0; i < cursor; ++i) {
if (text.at(i) == QLatin1Char('"'))
++quotes;
}
return (quotes % 2) != 0;
}
/// Start of the token the cursor sits in. The boundary is whitespace or '(',
/// so "tag:inbox and su" has its last token starting at 14, not at 0.
int tokenStart(const QString &text, int cursor)
{
int start = cursor;
while (start > 0) {
const QChar c = text.at(start - 1);
if (c.isSpace() || c == QLatin1Char('('))
break;
--start;
}
return start;
}
/// End of the token the cursor sits in, using the same boundary characters as
/// tokenStart plus ')'. The token must extend past the cursor: a range
/// separator to the right of the cursor decides which bound is being edited,
/// so truncating the token at the cursor would hide it.
int tokenEnd(const QString &text, int cursor)
{
int end = cursor;
while (end < text.size()) {
const QChar c = text.at(end);
if (c.isSpace() || c == QLatin1Char('(') || c == QLatin1Char(')'))
break;
++end;
}
return end;
}
} // namespace
CompletionContext completionContext(const QString &text, int cursor)
{
CompletionContext ctx;
if (cursor < 0 || cursor > text.size())
return ctx;
if (insideQuotes(text, cursor))
return ctx; // kind stays None
const int start = tokenStart(text, cursor);
const int end = tokenEnd(text, cursor);
const QString token = text.mid(start, end - start);
// Everything the user has typed up to the caret. Candidates are matched
// against this, never against text still sitting to the right of it.
const QString typed = text.mid(start, cursor - start);
const int colon = token.indexOf(QLatin1Char(':'));
if (colon < 0 || cursor <= start + colon) {
// No prefix yet, or the caret is still inside the keyword itself.
ctx.kind = CompletionContext::Prefix;
ctx.stem = typed;
ctx.replaceFrom = start;
ctx.replaceLength = typed.size();
return ctx;
}
ctx.kind = CompletionContext::Value;
ctx.prefix = token.left(colon).toLower();
const QString value = token.mid(colon + 1);
const int valueStart = start + colon + 1;
// A range is two independent values. Complete whichever side the cursor
// is in, leaving the other untouched.
const int separator = value.indexOf(QStringLiteral(".."));
if (separator < 0) {
ctx.stem = text.mid(valueStart, cursor - valueStart);
ctx.replaceFrom = valueStart;
ctx.replaceLength = ctx.stem.size();
return ctx;
}
ctx.allowRangeEntries = false;
const int cursorInValue = cursor - valueStart;
if (cursorInValue <= separator) {
// stem uses the cursor offset while replaceLength covers the whole
// side: matching runs on what has been typed so far, but accepting
// replaces the entire bound, so completing mid-word leaves no tail.
ctx.stem = value.left(cursorInValue);
ctx.replaceFrom = valueStart;
ctx.replaceLength = separator;
} else {
const int upperStart = separator + 2;
ctx.stem = value.mid(upperStart, cursorInValue - upperStart);
ctx.replaceFrom = valueStart + upperStart;
ctx.replaceLength = value.size() - upperStart;
}
return ctx;
}
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