1 files changed, 77 insertions, 0 deletions
diff --git a/sources/shiboken6/ApiExtractor/codesniphelpers.cpp b/sources/shiboken6/ApiExtractor/codesniphelpers.cpp
new file mode 100644
index 000000000..775cf10af
--- /dev/null
+++ b/sources/shiboken6/ApiExtractor/codesniphelpers.cpp
@@ -0,0 +1,77 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "codesniphelpers.h"
+
+#include <QtCore/QStringList>
+
+#include <algorithm>
+
+static inline int firstNonBlank(QStringView s)
+{
+    const auto it = std::find_if(s.cbegin(), s.cend(),
+                                 [] (QChar c) { return !c.isSpace(); });
+    return int(it - s.cbegin());
+}
+
+static inline bool isEmpty(QStringView s)
+{
+    return s.isEmpty()
+        || std::all_of(s.cbegin(), s.cend(),
+                       [] (QChar c) { return c.isSpace(); });
+}
+
+QString CodeSnipHelpers::dedent(const QString &code)
+{
+    if (code.isEmpty())
+        return code;
+    // Right trim if indent=0, or trim if single line
+    if (!code.at(0).isSpace() || !code.contains(u'\n'))
+        return code.trimmed();
+    const auto lines = QStringView{code}.split(u'\n');
+    int spacesToRemove = std::numeric_limits<int>::max();
+    for (const auto &line : lines) {
+        if (!isEmpty(line)) {
+            const int nonSpacePos = firstNonBlank(line);
+            if (nonSpacePos < spacesToRemove)
+                spacesToRemove = nonSpacePos;
+            if (spacesToRemove == 0)
+                return code;
+        }
+    }
+    QString result;
+    for (const auto &line : lines) {
+        if (!isEmpty(line) && spacesToRemove < line.size())
+            result += line.mid(spacesToRemove).toString();
+        result += u'\n';
+    }
+    return result;
+}
+
+QString CodeSnipHelpers::fixSpaces(QString code)
+{
+    code.remove(u'\r');
+    // Check for XML <tag>\n<space>bla...
+    if (code.startsWith(u"\n "))
+        code.remove(0, 1);
+    while (!code.isEmpty() && code.back().isSpace())
+        code.chop(1);
+    code = dedent(code);
+    if (!code.isEmpty() && !code.endsWith(u'\n'))
+        code.append(u'\n');
+    return code;
+}
+
+// Prepend a line to the code, observing indentation
+void CodeSnipHelpers::prependCode(QString *code, QString firstLine)
+{
+    while (!code->isEmpty() && code->front() == u'\n')
+        code->remove(0, 1);
+    if (!code->isEmpty() && code->front().isSpace()) {
+        const int indent = firstNonBlank(*code);
+        firstLine.prepend(QString(indent, u' '));
+    }
+    if (!firstLine.endsWith(u'\n'))
+        firstLine += u'\n';
+    code->prepend(firstLine);
+}