29 lines
1.2 KiB
C++
29 lines
1.2 KiB
C++
#include "FormatToStream.h"
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#include <QRegularExpression>
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#include <QTextStream>
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void FormatToStream(QTextStream &stream, QString format, std::function<void(QTextStream &, QString)> field_callback)
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{
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// Use static to optimize only once
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static QRegularExpression cached_find_var_re("(?:[^\\\\]|^)(\\/%([a-zA-Z0-9_-]+)%\\/)", QRegularExpression::OptimizeOnFirstUsageOption);
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int from = 0;
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QRegularExpressionMatch match;
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while (format.indexOf(cached_find_var_re, from, &match) >= 0) {
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if (from > 0) {
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// Because the regex has to check for backslash in front we have the from position
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// one position before where we actually should continue for the second match and later ie when from > 0
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// Therefor increase from by 1 to make the substring (midRef) calculation work
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++from;
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}
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// copy code before the var to the stream
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stream << format.midRef(from, match.capturedStart(1) - from);
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field_callback(stream, match.captured(2));
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from = match.capturedEnd()-1; // -1 because it wants to match one character before or start of line to make sure there is no backslash
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}
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if (from > 0) {
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// same reason as at the start of the loop
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++from;
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}
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stream << format.midRef(from);
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}
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