本文整理汇总了C++中QStack::back方法的典型用法代码示例。如果您正苦于以下问题：C++ QStack::back方法的具体用法？C++ QStack::back怎么用？C++ QStack::back使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QStack的用法示例。
在下文中一共展示了QStack::back方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: process
bool PreprocessContext::process(const QString &in, QString *out, QString *errorMessage)
{
out->clear();
if (in.isEmpty())
return true;
out->reserve(in.size());
reset();
const QChar newLine = QLatin1Char('\n');
const QStringList lines = in.split(newLine, QString::KeepEmptyParts);
const int lineCount = lines.size();
bool first = true;
for (int l = 0; l < lineCount; l++) {
// Check for element of the stack (be it dummy, else something is wrong).
if (m_sectionStack.isEmpty()) {
if (errorMessage)
*errorMessage = msgEmptyStack(l);
return false;
}
QString expression;
bool expressionValue = false;
PreprocessStackEntry &top = m_sectionStack.back();
switch (preprocessorLine(lines.at(l), &expression)) {
case IfSection:
// '@If': Push new section
if (top.condition) {
if (!TemplateEngine::evaluateBooleanJavaScriptExpression(m_scriptEngine, expression,
&expressionValue, errorMessage)) {
if (errorMessage)
*errorMessage = QString::fromLatin1("Error in @if at %1: %2")
.arg(l + 1).arg(*errorMessage);
return false;
}
}
m_sectionStack.push(PreprocessStackEntry(IfSection,
top.condition, expressionValue, expressionValue));
break;
case ElsifSection: // '@elsif': Check condition.
if (top.section != IfSection && top.section != ElsifSection) {
if (errorMessage)
*errorMessage = QString::fromLatin1("No preceding @if found for @elsif at %1")
.arg(l + 1);
return false;
}
if (top.parentEnabled) {
if (!TemplateEngine::evaluateBooleanJavaScriptExpression(m_scriptEngine, expression,
&expressionValue, errorMessage)) {
if (errorMessage)
*errorMessage = QString::fromLatin1("Error in @elsif at %1: %2")
.arg(l + 1).arg(*errorMessage);
return false;
}
}
top.section = ElsifSection;
// ignore consecutive '@elsifs' once something matched
if (top.anyIfClauseMatched) {
top.condition = false;
} else {
if ( (top.condition = expressionValue) )
top.anyIfClauseMatched = true;
}
break;
case ElseSection: // '@else': Check condition.
if (top.section != IfSection && top.section != ElsifSection) {
if (errorMessage)
*errorMessage = QString::fromLatin1("No preceding @if/@elsif found for @else at %1")
.arg(l + 1);
return false;
}
expressionValue = top.parentEnabled && !top.anyIfClauseMatched;
top.section = ElseSection;
top.condition = expressionValue;
break;
case EndifSection: // '@endif': Discard section.
m_sectionStack.pop();
break;
case OtherSection: // Rest: Append according to current condition.
if (top.condition) {
if (first)
first = false;
else
out->append(newLine);
out->append(lines.at(l));
}
break;
} // switch section
} // for lines
return true;
}