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MacroExpander: Allow registering local expansions

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This allows a MacroExpander also to describe an expansion it can
do which was restricted to the global VariableManager only.

The global is now just a thin (unneeded) wrapper about new "standard"
functionality.

Change-Id: Ida7ca70cf3d319eae4220ea8d12f3dd1c0d4042c
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
This commit is contained in:
hjk
2014-10-13 12:49:05 +02:00
parent e43af30faa
commit e279c7e007
35 changed files with 475 additions and 525 deletions
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287
src/libs/utils/macroexpander.cpp
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@@ -30,15 +30,294 @@
#include "macroexpander.h"
#include <QCoreApplication>
#include <QDebug>
#include <QFileInfo>
#include <QMap>
namespace Utils {
namespace Internal {
MacroExpander::MacroExpander(const MacroExpander::Resolver &resolver)
: m_resolver(resolver)
{}
const char kFilePathPostfix[] = ":FilePath";
const char kPathPostfix[] = ":Path";
const char kFileNamePostfix[] = ":FileName";
const char kFileBaseNamePostfix[] = ":FileBaseName";
class MacroExpanderPrivate
{
public:
QHash<QByteArray, MacroExpander::StringFunction> m_map;
QHash<QByteArray, MacroExpander::PrefixFunction> m_prefixMap;
QMap<QByteArray, QString> m_descriptions;
};
} // Internal
using namespace Internal;
/*!
\class Utils::MacroExpander
\brief The MacroExpander class manages \QC wide variables, that a user
can enter into many string settings. The variables are replaced by an actual value when the string
is used, similar to how environment variables are expanded by a shell.
\section1 Variables
Variable names can be basically any string without dollar sign and braces,
though it is recommended to only use 7-bit ASCII without special characters and whitespace.
If there are several variables that contain different aspects of the same object,
it is convention to give them the same prefix, followed by a colon and a postfix
that describes the aspect.
Examples of this are \c{CurrentDocument:FilePath} and \c{CurrentDocument:Selection}.
When the variable manager is requested to replace variables in a string, it looks for
variable names enclosed in %{ and }, like %{CurrentDocument:FilePath}.
Environment variables are accessible using the %{Env:...} notation.
For example, to access the SHELL environment variable, use %{Env:SHELL}.
\note The names of the variables are stored as QByteArray. They are typically
7-bit-clean. In cases where this is not possible, UTF-8 encoding is
assumed.
\section1 Providing Variable Values
Plugins can register variables together with a description through registerVariable().
A typical setup is to register variables in the Plugin::initialize() function.
\code
bool MyPlugin::initialize(const QStringList &arguments, QString *errorString)
{
[...]
MacroExpander::registerVariable(
"MyVariable",
tr("The current value of whatever I want."));
[]() -> QString {
QString value;
// do whatever is necessary to retrieve the value
[...]
return value;
}
);
[...]
}
\endcode
For variables that refer to a file, you should use the convenience function
MacroExpander::registerFileVariables().
The functions take a variable prefix, like \c MyFileVariable,
and automatically handle standardized postfixes like \c{:FilePath},
\c{:Path} and \c{:FileBaseName}, resulting in the combined variables, such as
\c{MyFileVariable:FilePath}.
\section1 Providing and Expanding Parametrized Strings
Though it is possible to just ask the variable manager for the value of some variable in your
code, the preferred use case is to give the user the possibility to parametrize strings, for
example for settings.
(If you ever think about doing the former, think twice. It is much more efficient
to just ask the plugin that provides the variable value directly, without going through
string conversions, and through the variable manager which will do a large scale poll. To be
more concrete, using the example from the Providing Variable Values section: instead of
calling \c{MacroExpander::value("MyVariable")}, it is much more efficient to just ask directly
with \c{MyPlugin::variableValue()}.)
\section2 User Interface
If the string that you want to parametrize is settable by the user, through a QLineEdit or
QTextEdit derived class, you should add a variable chooser to your UI, which allows adding
variables to the string by browsing through a list. See Core::VariableChooser for more
details.
\section2 Expanding Strings
Expanding variable values in strings is done by "macro expanders".
Utils::AbstractMacroExpander is the base class for these, and the variable manager
provides an implementation that expands \QC variables through
MacroExpander::macroExpander().
There are several different ways to expand a string, covering the different use cases,
listed here sorted by relevance:
\list
\li Using MacroExpander::expandedString(). This is the most comfortable way to get a string
with variable values expanded, but also the least flexible one. If this is sufficient for
you, use it.
\li Using the Utils::expandMacros() functions. These take a string and a macro expander (for which
you would use the one provided by the variable manager). Mostly the same as
MacroExpander::expandedString(), but also has a variant that does the replacement inline
instead of returning a new string.
\li Using Utils::QtcProcess::expandMacros(). This expands the string while conforming to the
quoting rules of the platform it is run on. Use this function with the variable manager's
macro expander if your string will be passed as a command line parameter string to an
external command.
\li Writing your own macro expander that nests the variable manager's macro expander. And then
doing one of the above. This allows you to expand additional "local" variables/macros,
that do not come from the variable manager.
\endlist
*/
/*!
* \internal
*/
MacroExpander::MacroExpander()
{
d = new MacroExpanderPrivate;
}
/*!
* \internal
*/
MacroExpander::~MacroExpander()
{
delete d;
}
/*!
* \internal
*/
bool MacroExpander::resolveMacro(const QString &name, QString *ret)
{
return m_resolver(name, ret);
bool found;
*ret = value(name.toUtf8(), &found);
return found;
}
/*!
* Returns the value of the given \a variable. If \a found is given, it is
* set to true if the variable has a value at all, false if not.
*/
QString MacroExpander::value(const QByteArray &variable, bool *found)
{
StringFunction sf = d->m_map.value(variable);
if (sf) {
if (found)
*found = true;
return sf();
}
for (auto it = d->m_prefixMap.constBegin(); it != d->m_prefixMap.constEnd(); ++it) {
if (variable.startsWith(it.key())) {
PrefixFunction pf = it.value();
if (found)
*found = true;
return pf(QString::fromUtf8(variable.mid(it.key().count())));
}
}
if (found)
*found = false;
return QString();
}
/*!
* Returns \a stringWithVariables with all variables replaced by their values.
* See the MacroExpander overview documentation for other ways to expand variables.
*
* \sa MacroExpander
* \sa macroExpander()
*/
QString MacroExpander::expandedString(const QString &stringWithVariables)
{
return Utils::expandMacros(stringWithVariables, this);
}
/*!
* Makes the given string-valued \a prefix known to the variable manager,
* together with a localized \a description.
*
* The \a value PrefixFunction will be called and gets the full variable name
* with the prefix stripped as input.
*
* \sa registerVariables(), registerIntVariable(), registerFileVariables()
*/
void MacroExpander::registerPrefix(const QByteArray &prefix, const QString &description,
const MacroExpander::PrefixFunction &value)
{
QByteArray tmp = prefix;
if (!tmp.endsWith(':'))
tmp.append(':');
d->m_descriptions.insert(tmp + "<value>", description);
d->m_prefixMap.insert(tmp, value);
}
/*!
* Makes the given string-valued \a variable known to the variable manager,
* together with a localized \a description.
*
* \sa registerFileVariables(), registerIntVariable(), registerPrefix()
*/
void MacroExpander::registerVariable(const QByteArray &variable,
const QString &description, const StringFunction &value)
{
d->m_descriptions.insert(variable, description);
d->m_map.insert(variable, value);
}
/*!
* Makes the given integral-valued \a variable known to the variable manager,
* together with a localized \a description.
*
* \sa registerVariable(), registerFileVariables(), registerPrefix()
*/
void MacroExpander::registerIntVariable(const QByteArray &variable,
const QString &description, const MacroExpander::IntFunction &value)
{
const MacroExpander::IntFunction valuecopy = value; // do not capture a reference in a lambda
registerVariable(variable, description,
[valuecopy]() { return QString::number(valuecopy ? valuecopy() : 0); });
}
/*!
* Convenience function to register several variables with the same \a prefix, that have a file
* as a value. Takes the prefix and registers variables like \c{prefix:FilePath} and
* \c{prefix:Path}, with descriptions that start with the given \a heading.
* For example \c{registerFileVariables("CurrentDocument", tr("Current Document"))} registers
* variables such as \c{CurrentDocument:FilePath} with description
* "Current Document: Full path including file name."
*
* \sa registerVariable(), registerIntVariable(), registerPrefix()
*/
void MacroExpander::registerFileVariables(const QByteArray &prefix,
const QString &heading, const StringFunction &base)
{
registerVariable(prefix + kFilePathPostfix,
QCoreApplication::translate("Utils::MacroExpander", "%1: Full path including file name.").arg(heading),
[base]() -> QString { QString tmp = base(); return tmp.isEmpty() ? QString() : QFileInfo(tmp).filePath(); });
registerVariable(prefix + kPathPostfix,
QCoreApplication::translate("Utils::MacroExpander", "%1: Full path excluding file name.").arg(heading),
[base]() -> QString { QString tmp = base(); return tmp.isEmpty() ? QString() : QFileInfo(tmp).path(); });
registerVariable(prefix + kFileNamePostfix,
QCoreApplication::translate("Utils::MacroExpander", "%1: File name without path.").arg(heading),
[base]() -> QString { QString tmp = base(); return tmp.isEmpty() ? QString() : QFileInfo(tmp).fileName(); });
registerVariable(prefix + kFileBaseNamePostfix,
QCoreApplication::translate("Utils::MacroExpander", "%1: File base name without path and suffix.").arg(heading),
[base]() -> QString { QString tmp = base(); return tmp.isEmpty() ? QString() : QFileInfo(tmp).baseName(); });
}
/*!
* Returns all registered variable names.
*
* \sa registerVariable()
* \sa registerFileVariables()
*/
QList<QByteArray> MacroExpander::variables()
{
return d->m_descriptions.keys();
}
/*!
* Returns the description that was registered for the \a variable.
*/
QString MacroExpander::variableDescription(const QByteArray &variable)
{
return d->m_descriptions.value(variable);
}
} // namespace Utils