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C++ function signature: Improve preserving of default arguments.

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Task-number: QTCREATORBUG-5978
Change-Id: Iab0bba3c16b4cd435f0dc6339db49f209f1359d3
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>
This commit is contained in:
Christian Kamm
2011-11-15 15:00:11 +01:00
parent abd98ebeaa
commit a072941617
2 changed files with 298 additions and 105 deletions
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361
src/plugins/cppeditor/cppfunctiondecldeflink.cpp
View File

@@ -54,6 +54,7 @@
#include <texteditor/texteditorconstants.h>
#include <QtCore/QtConcurrentRun>
#include <QtCore/QVarLengthArray>
using namespace CPlusPlus;
using namespace CppEditor;
@@ -192,6 +193,8 @@ static QSharedPointer<FunctionDeclDefLink> findLinkHelper(QSharedPointer<Functio
// the parens are necessary for finding good places for changes
if (!targetFuncDecl->lparen_token || !targetFuncDecl->rparen_token)
return noResult;
// if the source and target argument counts differ, something is wrong
QTC_ASSERT(targetFuncDecl->symbol->argumentCount() == link->sourceFunction->argumentCount(), return noResult);
int targetStart, targetEnd;
declDefLinkStartEnd(targetFile, targetParent, targetFuncDecl, &targetStart, &targetEnd);
@@ -376,7 +379,7 @@ void FunctionDeclDefLink::showMarker(CPPEditorWidget *editor)
}
// does consider foo(void) to have one argument
static int declaredArgumentCount(Function *function)
static int declaredParameterCount(Function *function)
{
int c = function->argumentCount();
if (c == 0 && function->memberCount() > 0 && function->memberAt(0)->type().type()->isVoidType())
@@ -398,7 +401,9 @@ static bool hasCommentedName(
return false;
if (Function *f = declarator->symbol) {
QTC_ASSERT(f, return false);
if (Symbol *a = f->argumentAt(i)) {
QTC_ASSERT(a, return false);
if (a->name())
return false;
}
@@ -479,10 +484,84 @@ static SpecifierAST *findFirstReplaceableSpecifier(TranslationUnit *translationU
return 0;
}
typedef QVarLengthArray<int, 10> IndicesList;
template <class IndicesListType>
static int findUniqueTypeMatch(int sourceParamIndex, Function *sourceFunction, Function *newFunction,
const IndicesListType &sourceParams, const IndicesListType &newParams)
{
Symbol *sourceParam = sourceFunction->argumentAt(sourceParamIndex);
// if other sourceParams have the same type, we can't do anything
foreach (int otherSourceParamIndex, sourceParams) {
if (sourceParamIndex == otherSourceParamIndex)
continue;
if (sourceParam->type().isEqualTo(sourceFunction->argumentAt(otherSourceParamIndex)->type()))
return -1;
}
// if there's exactly one newParam with the same type, bind to that
// this is primarily done to catch moves of unnamed parameters
int newParamWithSameTypeIndex = -1;
foreach (int newParamIndex, newParams) {
if (sourceParam->type().isEqualTo(newFunction->argumentAt(newParamIndex)->type())) {
if (newParamWithSameTypeIndex != -1)
return -1;
newParamWithSameTypeIndex = newParamIndex;
}
}
return newParamWithSameTypeIndex;
}
static IndicesList unmatchedIndices(const IndicesList &indices)
{
IndicesList ret;
ret.reserve(indices.size());
for (int i = 0; i < indices.size(); ++i) {
if (indices[i] == -1)
ret += i;
}
return ret;
}
static QString ensureCorrectParameterSpacing(const QString &text, bool isFirstParam)
{
if (isFirstParam) { // drop leading spaces
int firstNonSpace = 0;
while (firstNonSpace + 1 < text.size() && text.at(firstNonSpace).isSpace())
++firstNonSpace;
return text.mid(firstNonSpace);
} else { // ensure one leading space
if (text.isEmpty() || !text.at(0).isSpace()) {
return QLatin1Char(' ') + text;
}
}
return text;
}
static unsigned findCommaTokenBetween(const CppTools::CppRefactoringFileConstPtr &file,
ParameterDeclarationAST *left, ParameterDeclarationAST *right)
{
unsigned last = left->lastToken() - 1;
for (unsigned tokenIndex = right->firstToken();
tokenIndex > last;
--tokenIndex) {
if (file->tokenAt(tokenIndex).kind() == T_COMMA)
return tokenIndex;
}
return 0;
}
Utils::ChangeSet FunctionDeclDefLink::changes(const Snapshot &snapshot, int targetOffset)
{
Utils::ChangeSet changes;
// Everything prefixed with 'new' in this function relates to the state of the 'source'
// function *after* the user did his changes.
// The 'newTarget' prefix indicates something relates to the changes we plan to do
// to the 'target' function.
// parse the current source declaration
TypeOfExpression typeOfExpression; // ### just need to preprocess...
typeOfExpression.init(sourceDocument, snapshot);
@@ -583,118 +662,228 @@ Utils::ChangeSet FunctionDeclDefLink::changes(const Snapshot &snapshot, int targ
Control *control = sourceContext.control().data();
Overview overview;
const unsigned sourceArgCount = declaredArgumentCount(sourceFunction);
const unsigned newArgCount = declaredArgumentCount(newFunction);
const unsigned targetArgCount = declaredArgumentCount(targetFunction);
// make a easy to access list of the target parameter declarations
QVarLengthArray<ParameterDeclarationAST *, 10> targetParameterDecls;
QTC_ASSERT(targetFunctionDeclarator->parameter_declaration_clause, return changes);
for (ParameterDeclarationListAST *it = targetFunctionDeclarator->parameter_declaration_clause->parameter_declaration_list;
it; it = it->next) {
targetParameterDecls += it->value;
}
// check if parameter types or names have changed
const unsigned existingArgs = qMin(targetArgCount, newArgCount);
ParameterDeclarationClauseAST *targetParameterDecl =
targetFunctionDeclarator->parameter_declaration_clause;
ParameterDeclarationListAST *firstTargetParameterDeclIt =
targetParameterDecl ? targetParameterDecl->parameter_declaration_list : 0;
ParameterDeclarationListAST *targetParameterDeclIt = firstTargetParameterDeclIt;
for (unsigned i = 0;
i < existingArgs && targetParameterDeclIt;
++i, targetParameterDeclIt = targetParameterDeclIt->next) {
Symbol *targetParam = targetFunction->argumentAt(i);
Symbol *newParam = newFunction->argumentAt(i);
// the number of parameters in sourceFunction or targetFunction
const int existingParamCount = declaredParameterCount(sourceFunction);
QTC_ASSERT(existingParamCount == declaredParameterCount(targetFunction), return changes);
QTC_ASSERT(existingParamCount == targetParameterDecls.size(), return changes);
// if new's name and type are the same as source's, forbid changes
bool allowChangeType = true;
const Name *replacementName = newParam->name();
if (i < sourceArgCount) {
const int newParamCount = declaredParameterCount(newFunction);
// When syncing parameters we need to take care that parameters inserted or
// removed in the middle or parameters being reshuffled are treated correctly.
// To do that, we construct a newParam -> sourceParam map, based on parameter
// names and types.
// Initially they start out with -1 to indicate a new parameter.
IndicesList newParamToSourceParam(newParamCount);
for (int i = 0; i < newParamCount; ++i)
newParamToSourceParam[i] = -1;
// fill newParamToSourceParam
{
IndicesList sourceParamToNewParam(existingParamCount);
for (int i = 0; i < existingParamCount; ++i)
sourceParamToNewParam[i] = -1;
QMultiHash<QString, int> sourceParamNameToIndex;
for (int i = 0; i < existingParamCount; ++i) {
Symbol *sourceParam = sourceFunction->argumentAt(i);
if (newParam->type().isEqualTo(sourceParam->type()))
allowChangeType = false;
sourceParamNameToIndex.insert(overview(sourceParam->name()), i);
}
QMultiHash<QString, int> newParamNameToIndex;
for (int i = 0; i < newParamCount; ++i) {
Symbol *newParam = newFunction->argumentAt(i);
newParamNameToIndex.insert(overview(newParam->name()), i);
}
// name-based binds (possibly disambiguated by type)
for (int sourceParamIndex = 0; sourceParamIndex < existingParamCount; ++sourceParamIndex) {
Symbol *sourceParam = sourceFunction->argumentAt(sourceParamIndex);
const QString &name = overview(sourceParam->name());
QList<int> newParams = newParamNameToIndex.values(name);
QList<int> sourceParams = sourceParamNameToIndex.values(name);
if (newParams.isEmpty())
continue;
// if the names match uniquely, bind them
// this catches moves of named parameters
if (newParams.size() == 1 && sourceParams.size() == 1) {
sourceParamToNewParam[sourceParamIndex] = newParams.first();
newParamToSourceParam[newParams.first()] = sourceParamIndex;
} else {
// if the name match is not unique, try to find a unique
// type match among the same-name parameters
const int newParamWithSameTypeIndex = findUniqueTypeMatch(
sourceParamIndex, sourceFunction, newFunction,
sourceParams, newParams);
if (newParamWithSameTypeIndex != -1) {
sourceParamToNewParam[sourceParamIndex] = newParamWithSameTypeIndex;
newParamToSourceParam[newParamWithSameTypeIndex] = sourceParamIndex;
}
}
}
// find unique type matches among the unbound parameters
const IndicesList &freeSourceParams = unmatchedIndices(sourceParamToNewParam);
const IndicesList &freeNewParams = unmatchedIndices(newParamToSourceParam);
foreach (int sourceParamIndex, freeSourceParams) {
const int newParamWithSameTypeIndex = findUniqueTypeMatch(
sourceParamIndex, sourceFunction, newFunction,
freeSourceParams, freeNewParams);
if (newParamWithSameTypeIndex != -1) {
sourceParamToNewParam[sourceParamIndex] = newParamWithSameTypeIndex;
newParamToSourceParam[newParamWithSameTypeIndex] = sourceParamIndex;
}
}
// add position based binds if possible
for (int i = 0; i < existingParamCount && i < newParamCount; ++i) {
if (newParamToSourceParam[i] == -1 && sourceParamToNewParam[i] == -1) {
newParamToSourceParam[i] = i;
sourceParamToNewParam[i] = i;
}
}
}
// build the new parameter declarations
QString newTargetParameters;
bool hadChanges = newParamCount < existingParamCount; // below, additions and changes set this to true as well
for (int newParamIndex = 0; newParamIndex < newParamCount; ++newParamIndex) {
const int existingParamIndex = newParamToSourceParam[newParamIndex];
Symbol *newParam = newFunction->argumentAt(newParamIndex);
const bool isFirstNewParam = newParamIndex == 0;
if (!isFirstNewParam)
newTargetParameters += QLatin1Char(',');
QString newTargetParam;
// if it's genuinely new, add it
if (existingParamIndex == -1) {
FullySpecifiedType type = rewriteType(newParam->type(), &env, control);
newTargetParam = overview(type, newParam->name());
hadChanges = true;
}
// otherwise preserve as much as possible from the existing parameter
else {
Symbol *targetParam = targetFunction->argumentAt(existingParamIndex);
Symbol *sourceParam = sourceFunction->argumentAt(existingParamIndex);
ParameterDeclarationAST *targetParamAst = targetParameterDecls.at(existingParamIndex);
int parameterStart = targetFile->endOf(targetFunctionDeclarator->lparen_token);
if (existingParamIndex > 0) {
ParameterDeclarationAST *prevTargetParamAst = targetParameterDecls.at(existingParamIndex - 1);
const unsigned commaToken = findCommaTokenBetween(targetFile, prevTargetParamAst, targetParamAst);
if (commaToken > 0)
parameterStart = targetFile->endOf(commaToken);
}
int parameterEnd = targetFile->startOf(targetFunctionDeclarator->rparen_token);
if (existingParamIndex + 1 < existingParamCount) {
ParameterDeclarationAST *nextTargetParamAst = targetParameterDecls.at(existingParamIndex + 1);
const unsigned commaToken = findCommaTokenBetween(targetFile, targetParamAst, nextTargetParamAst);
if (commaToken > 0)
parameterEnd = targetFile->startOf(commaToken);
}
// if the name wasn't changed, don't change the target name even if it's different
const Name *replacementName = newParam->name();
if (namesEqual(replacementName, sourceParam->name()))
replacementName = targetParam->name();
}
// don't change the name if it's in a comment
if (hasCommentedName(targetFile->cppDocument()->translationUnit(),
targetFile->cppDocument()->source(),
targetFunctionDeclarator, i))
targetFunctionDeclarator, existingParamIndex))
replacementName = 0;
// find the end of the parameter declaration
ParameterDeclarationAST *targetParamAst = targetParameterDeclIt->value;
int parameterNameEnd = 0;
// need to change the type (and name)?
if (!newParam->type().isEqualTo(sourceParam->type())
&& !newParam->type().isEqualTo(targetParam->type())) {
const int parameterTypeStart = targetFile->startOf(targetParamAst);
int parameterTypeEnd = 0;
if (targetParamAst->declarator)
parameterNameEnd = targetFile->endOf(targetParamAst->declarator);
parameterTypeEnd = targetFile->endOf(targetParamAst->declarator);
else if (targetParamAst->type_specifier_list)
parameterNameEnd = targetFile->endOf(targetParamAst->type_specifier_list->lastToken() - 1);
parameterTypeEnd = targetFile->endOf(targetParamAst->type_specifier_list->lastToken() - 1);
else
parameterNameEnd = targetFile->startOf(targetParamAst);
parameterTypeEnd = targetFile->startOf(targetParamAst);
// change name and type?
if (allowChangeType
&& !targetParam->type().isEqualTo(newParam->type())) {
FullySpecifiedType replacementType = rewriteType(newParam->type(), &env, control);
const QString replacement = overview(replacementType, replacementName);
changes.replace(targetFile->startOf(targetParamAst),
parameterNameEnd,
replacement);
newTargetParam = targetFile->textOf(parameterStart, parameterTypeStart);
newTargetParam += overview(replacementType, replacementName);
newTargetParam += targetFile->textOf(parameterTypeEnd, parameterEnd);
hadChanges = true;
}
// change the name only?
else if (!namesEqual(targetParam->name(), replacementName)) {
DeclaratorIdAST *id = getDeclaratorId(targetParamAst->declarator);
QString replacementNameStr = overview(replacementName);
const QString &replacementNameStr = overview(replacementName);
if (id) {
changes.replace(targetFile->range(id), replacementNameStr);
newTargetParam += targetFile->textOf(parameterStart, targetFile->startOf(id));
QString rest = targetFile->textOf(targetFile->endOf(id), parameterEnd);
if (replacementNameStr.isEmpty()) {
unsigned nextToken = targetFile->tokenAt(id->lastToken()).kind(); // token after id
if (nextToken == T_COMMA
|| nextToken == T_EQUAL
|| nextToken == T_RPAREN) {
if (nextToken != T_EQUAL)
newTargetParam = newTargetParam.trimmed();
newTargetParam += rest.trimmed();
}
} else {
newTargetParam += replacementNameStr;
newTargetParam += rest;
}
} else {
// add name to unnamed parameter
replacementNameStr.prepend(QLatin1Char(' '));
int end;
if (targetParamAst->equal_token) {
end = targetFile->startOf(targetParamAst->equal_token);
replacementNameStr.append(QLatin1Char(' '));
} else {
// one past end on purpose
end = targetFile->startOf(targetParamAst->lastToken());
int insertPos = parameterEnd;
if (targetParamAst->equal_token)
insertPos = targetFile->startOf(targetParamAst->equal_token);
newTargetParam += targetFile->textOf(parameterStart, insertPos);
// prepend a space, unless ' ', '*', '&'
QChar lastChar;
if (!newTargetParam.isEmpty())
lastChar = newTargetParam.at(newTargetParam.size() - 1);
if (!lastChar.isSpace() && lastChar != QLatin1Char('*') && lastChar != QLatin1Char('&'))
newTargetParam += QLatin1Char(' ');
newTargetParam += replacementNameStr;
// append a space, unless unnecessary
const QString &rest = targetFile->textOf(insertPos, parameterEnd);
if (!rest.isEmpty() && !rest.at(0).isSpace())
newTargetParam += QLatin1Char(' ');
newTargetParam += rest;
}
changes.replace(parameterNameEnd, end, replacementNameStr);
hadChanges = true;
}
// change nothing - though the parameter might still have moved
else {
if (existingParamIndex != newParamIndex)
hadChanges = true;
newTargetParam = targetFile->textOf(parameterStart, parameterEnd);
}
}
// apply
newTargetParameters += ensureCorrectParameterSpacing(newTargetParam, isFirstNewParam);
}
// remove some parameters?
if (newArgCount < targetArgCount) {
targetParameterDeclIt = firstTargetParameterDeclIt;
if (targetParameterDeclIt) {
if (newArgCount == 0) {
changes.remove(targetFile->startOf(targetParameterDeclIt->firstToken()),
targetFile->endOf(targetParameterDeclIt->lastToken() - 1));
} else {
// get the last valid argument
for (unsigned i = 0; i < newArgCount - 1 && targetParameterDeclIt; ++i)
targetParameterDeclIt = targetParameterDeclIt->next;
if (targetParameterDeclIt) {
const int start = targetFile->endOf(targetParameterDeclIt->value);
const int end = targetFile->endOf(targetParameterDecl->lastToken() - 1);
changes.remove(start, end);
}
}
}
}
// add some parameters?
else if (newArgCount > targetArgCount) {
QString newParams;
for (unsigned i = targetArgCount; i < newArgCount; ++i) {
Symbol *param = newFunction->argumentAt(i);
FullySpecifiedType type = rewriteType(param->type(), &env, control);
if (i != 0)
newParams += QLatin1String(", ");
newParams += overview(type, param->name());
}
targetParameterDeclIt = firstTargetParameterDeclIt;
if (targetParameterDeclIt) {
while (targetParameterDeclIt->next)
targetParameterDeclIt = targetParameterDeclIt->next;
changes.insert(targetFile->endOf(targetParameterDeclIt->value), newParams);
} else {
changes.insert(targetFile->endOf(targetFunctionDeclarator->lparen_token), newParams);
}
if (hadChanges) {
changes.replace(targetFile->endOf(targetFunctionDeclarator->lparen_token),
targetFile->startOf(targetFunctionDeclarator->rparen_token),
newTargetParameters);
}
}

14
src/plugins/cppeditor/cppfunctiondecldeflink.h
View File

@@ -100,16 +100,20 @@ public:
QTextCursor nameSelection;
QString nameInitial;
// 1-based line and column
unsigned targetLine;
unsigned targetColumn;
QString targetInitial;
// The 'source' prefix denotes information about the original state
// of the function before the user did any edits.
CPlusPlus::Document::Ptr sourceDocument;
CPlusPlus::Function *sourceFunction;
CPlusPlus::DeclarationAST *sourceDeclaration;
CPlusPlus::FunctionDeclaratorAST *sourceFunctionDeclarator;
// The 'target' prefix denotes information about the remote declaration matching
// the 'source' declaration, where we will try to apply the user changes.
// 1-based line and column
unsigned targetLine;
unsigned targetColumn;
QString targetInitial;
CppTools::CppRefactoringFileConstPtr targetFile;
CPlusPlus::Function *targetFunction;
CPlusPlus::DeclarationAST *targetDeclaration;