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lazily stringify expressions

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This commit is contained in:
Mickey Rose
2017-01-09 13:23:10 +01:00
committed by Martin Hořeňovský
parent 3b7511e564
commit a1e9b841ff
7 changed files with 223 additions and 110 deletions
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57
include/internal/catch_assertionresult.h
View File

@@ -13,6 +13,27 @@
namespace Catch {
struct STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison;
struct DecomposedExpression
{
virtual ~DecomposedExpression() {}
virtual bool isBinaryExpression() const {
return false;
}
virtual void reconstructExpression( std::string& dest ) const = 0;
// Only simple binary comparisons can be decomposed.
// If more complex check is required then wrap sub-expressions in parentheses.
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator + ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator - ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator * ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator / ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator % ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator && ( T const& );
template<typename T> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator || ( T const& );
};
struct AssertionInfo
{
AssertionInfo() {}
@@ -29,11 +50,41 @@ namespace Catch {
struct AssertionResultData
{
AssertionResultData() : resultType( ResultWas::Unknown ) {}
AssertionResultData() : decomposedExpression( CATCH_NULL )
, resultType( ResultWas::Unknown )
, negated( false )
, parenthesized( false ) {}
std::string reconstructedExpression;
void negate( bool parenthesize ) {
negated = !negated;
parenthesized = parenthesize;
if( resultType == ResultWas::Ok )
resultType = ResultWas::ExpressionFailed;
else if( resultType == ResultWas::ExpressionFailed )
resultType = ResultWas::Ok;
}
std::string const& reconstructExpression() const {
if( decomposedExpression != CATCH_NULL ) {
decomposedExpression->reconstructExpression( reconstructedExpression );
if( parenthesized ) {
reconstructedExpression.insert( 0, 1, '(' );
reconstructedExpression.append( 1, ')' );
}
if( negated ) {
reconstructedExpression.insert( 0, 1, '!' );
}
decomposedExpression = CATCH_NULL;
}
return reconstructedExpression;
}
mutable DecomposedExpression const* decomposedExpression;
mutable std::string reconstructedExpression;
std::string message;
ResultWas::OfType resultType;
bool negated;
bool parenthesized;
};
class AssertionResult {
@@ -60,6 +111,8 @@ namespace Catch {
std::string getMessage() const;
SourceLineInfo getSourceInfo() const;
std::string getTestMacroName() const;
void discardDecomposedExpression() const;
void expandDecomposedExpression() const;
protected:
AssertionInfo m_info;

10
include/internal/catch_assertionresult.hpp
View File

@@ -72,7 +72,7 @@ namespace Catch {
}
std::string AssertionResult::getExpandedExpression() const {
return m_resultData.reconstructedExpression;
return m_resultData.reconstructExpression();
}
std::string AssertionResult::getMessage() const {
@@ -86,6 +86,14 @@ namespace Catch {
return m_info.macroName;
}
void AssertionResult::discardDecomposedExpression() const {
m_resultData.decomposedExpression = CATCH_NULL;
}
void AssertionResult::expandDecomposedExpression() const {
m_resultData.reconstructExpression();
}
} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_ASSERTIONRESULT_HPP_INCLUDED

8
include/internal/catch_capture.hpp
View File

@@ -132,13 +132,7 @@
do { \
Catch::ResultBuilder __catchResult( macroName, CATCH_INTERNAL_LINEINFO, #arg ", " #matcher, resultDisposition ); \
try { \
std::string matcherAsString = (matcher).toString(); \
__catchResult \
.setLhs( Catch::toString( arg ) ) \
.setRhs( matcherAsString == Catch::Detail::unprintableString ? #matcher : matcherAsString ) \
.setOp( "matches" ) \
.setResultType( (matcher).match( arg ) ); \
__catchResult.captureExpression(); \
__catchResult.captureMatch( arg, matcher, #matcher ); \
} catch( ... ) { \
__catchResult.useActiveException( resultDisposition | Catch::ResultDisposition::ContinueOnFailure ); \
} \

143
include/internal/catch_expression_lhs.hpp
View File

@@ -14,90 +14,155 @@
namespace Catch {
// Wraps the LHS of an expression and captures the operator and RHS (if any) -
// wrapping them all in a ResultBuilder object
template<typename T>
class ExpressionLhs {
ExpressionLhs& operator = ( ExpressionLhs const& );
# ifdef CATCH_CONFIG_CPP11_GENERATED_METHODS
ExpressionLhs& operator = ( ExpressionLhs && ) = delete;
# endif
template<typename LhsT, Internal::Operator Op, typename RhsT>
class BinaryExpression;
template<typename ArgT, typename MatcherT>
class MatchExpression;
// Wraps the LHS of an expression and overloads comparison operators
// for also capturing those and RHS (if any)
template<typename T>
class ExpressionLhs : public DecomposedExpression {
public:
ExpressionLhs( ResultBuilder& rb, T lhs ) : m_rb( rb ), m_lhs( lhs ) {}
# ifdef CATCH_CONFIG_CPP11_GENERATED_METHODS
ExpressionLhs( ExpressionLhs const& ) = default;
ExpressionLhs( ExpressionLhs && ) = default;
# endif
ExpressionLhs( ResultBuilder& rb, T lhs ) : m_rb( rb ), m_lhs( lhs ), m_truthy(false) {}
template<typename RhsT>
ResultBuilder& operator == ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsEqualTo, RhsT const&>
operator == ( RhsT const& rhs ) const {
return captureExpression<Internal::IsEqualTo>( rhs );
}
template<typename RhsT>
ResultBuilder& operator != ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsNotEqualTo, RhsT const&>
operator != ( RhsT const& rhs ) const {
return captureExpression<Internal::IsNotEqualTo>( rhs );
}
template<typename RhsT>
ResultBuilder& operator < ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsLessThan, RhsT const&>
operator < ( RhsT const& rhs ) const {
return captureExpression<Internal::IsLessThan>( rhs );
}
template<typename RhsT>
ResultBuilder& operator > ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsGreaterThan, RhsT const&>
operator > ( RhsT const& rhs ) const {
return captureExpression<Internal::IsGreaterThan>( rhs );
}
template<typename RhsT>
ResultBuilder& operator <= ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsLessThanOrEqualTo, RhsT const&>
operator <= ( RhsT const& rhs ) const {
return captureExpression<Internal::IsLessThanOrEqualTo>( rhs );
}
template<typename RhsT>
ResultBuilder& operator >= ( RhsT const& rhs ) {
BinaryExpression<T, Internal::IsGreaterThanOrEqualTo, RhsT const&>
operator >= ( RhsT const& rhs ) const {
return captureExpression<Internal::IsGreaterThanOrEqualTo>( rhs );
}
ResultBuilder& operator == ( bool rhs ) {
BinaryExpression<T, Internal::IsEqualTo, bool> operator == ( bool rhs ) const {
return captureExpression<Internal::IsEqualTo>( rhs );
}
ResultBuilder& operator != ( bool rhs ) {
BinaryExpression<T, Internal::IsNotEqualTo, bool> operator != ( bool rhs ) const {
return captureExpression<Internal::IsNotEqualTo>( rhs );
}
void endExpression() {
bool value = m_lhs ? true : false;
m_truthy = m_lhs ? true : false;
m_rb
.setLhs( Catch::toString( value ) )
.setResultType( value )
.endExpression();
.setResultType( m_truthy )
.endExpression( *this );
}
// Only simple binary expressions are allowed on the LHS.
// If more complex compositions are required then place the sub expression in parentheses
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator + ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator - ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator / ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator * ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator && ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator || ( RhsT const& );
virtual void reconstructExpression( std::string& dest ) const CATCH_OVERRIDE {
dest = Catch::toString( m_truthy );
}
private:
template<Internal::Operator Op, typename RhsT>
ResultBuilder& captureExpression( RhsT const& rhs ) {
return m_rb
.setResultType( Internal::compare<Op>( m_lhs, rhs ) )
.setLhs( Catch::toString( m_lhs ) )
.setRhs( Catch::toString( rhs ) )
.setOp( Internal::OperatorTraits<Op>::getName() );
BinaryExpression<T, Op, RhsT&> captureExpression( RhsT& rhs ) const {
return BinaryExpression<T, Op, RhsT&>( m_rb, m_lhs, rhs );
}
template<Internal::Operator Op>
BinaryExpression<T, Op, bool> captureExpression( bool rhs ) const {
return BinaryExpression<T, Op, bool>( m_rb, m_lhs, rhs );
}
private:
ResultBuilder& m_rb;
T m_lhs;
bool m_truthy;
};
template<typename LhsT, Internal::Operator Op, typename RhsT>
class BinaryExpression : public DecomposedExpression {
public:
BinaryExpression( ResultBuilder& rb, LhsT lhs, RhsT rhs )
: m_rb( rb ), m_lhs( lhs ), m_rhs( rhs ) {}
void endExpression() const {
m_rb
.setResultType( Internal::compare<Op>( m_lhs, m_rhs ) )
.endExpression( *this );
}
virtual bool isBinaryExpression() const CATCH_OVERRIDE {
return true;
}
virtual void reconstructExpression( std::string& dest ) const CATCH_OVERRIDE {
std::string lhs = Catch::toString( m_lhs );
std::string rhs = Catch::toString( m_rhs );
char delim = lhs.size() + rhs.size() < 40 &&
lhs.find('\n') == std::string::npos &&
rhs.find('\n') == std::string::npos ? ' ' : '\n';
dest.reserve( 7 + lhs.size() + rhs.size() );
// 2 for spaces around operator
// 2 for operator
// 2 for parentheses (conditionally added later)
// 1 for negation (conditionally added later)
dest = lhs;
dest += delim;
dest += Internal::OperatorTraits<Op>::getName();
dest += delim;
dest += rhs;
}
private:
ResultBuilder& m_rb;
LhsT m_lhs;
RhsT m_rhs;
};
template<typename ArgT, typename MatcherT>
class MatchExpression : public DecomposedExpression {
public:
MatchExpression( ArgT arg, MatcherT matcher, char const* matcherString )
: m_arg( arg ), m_matcher( matcher ), m_matcherString( matcherString ) {}
virtual bool isBinaryExpression() const CATCH_OVERRIDE {
return true;
}
virtual void reconstructExpression( std::string& dest ) const CATCH_OVERRIDE {
std::string matcherAsString = m_matcher.toString();
dest = Catch::toString( m_arg );
dest += ' ';
if( matcherAsString == Detail::unprintableString )
dest += m_matcherString;
else
dest += matcherAsString;
}
private:
ArgT m_arg;
MatcherT m_matcher;
char const* m_matcherString;
};
} // end namespace Catch

32
include/internal/catch_result_builder.h
View File

@@ -19,8 +19,6 @@ namespace Catch {
template<typename T> class ExpressionLhs;
struct STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison;
struct CopyableStream {
CopyableStream() {}
CopyableStream( CopyableStream const& other ) {
@@ -34,7 +32,7 @@ namespace Catch {
std::ostringstream oss;
};
class ResultBuilder {
class ResultBuilder : public DecomposedExpression {
public:
ResultBuilder( char const* macroName,
SourceLineInfo const& lineInfo,
@@ -52,19 +50,15 @@ namespace Catch {
return *this;
}
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator && ( RhsT const& );
template<typename RhsT> STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison& operator || ( RhsT const& );
ResultBuilder& setResultType( ResultWas::OfType result );
ResultBuilder& setResultType( bool result );
ResultBuilder& setLhs( std::string const& lhs );
ResultBuilder& setRhs( std::string const& rhs );
ResultBuilder& setOp( std::string const& op );
void endExpression();
void endExpression( DecomposedExpression const& expr );
virtual void reconstructExpression( std::string& dest ) const CATCH_OVERRIDE;
std::string reconstructExpression() const;
AssertionResult build() const;
AssertionResult build( DecomposedExpression const& expr ) const;
void useActiveException( ResultDisposition::Flags resultDisposition = ResultDisposition::Normal );
void captureResult( ResultWas::OfType resultType );
@@ -76,14 +70,12 @@ namespace Catch {
bool shouldDebugBreak() const;
bool allowThrows() const;
template<typename ArgT, typename MatcherT>
void captureMatch( ArgT const& arg, MatcherT const& matcher, char const* matcherString );
private:
AssertionInfo m_assertionInfo;
AssertionResultData m_data;
struct ExprComponents {
ExprComponents() : testFalse( false ) {}
bool testFalse;
std::string lhs, rhs, op;
} m_exprComponents;
CopyableStream m_stream;
bool m_shouldDebugBreak;
@@ -106,6 +98,14 @@ namespace Catch {
return ExpressionLhs<bool>( *this, value );
}
template<typename ArgT, typename MatcherT>
inline void ResultBuilder::captureMatch( ArgT const& arg, MatcherT const& matcher,
char const* matcherString ) {
MatchExpression<ArgT const&, MatcherT const&> expr( arg, matcher, matcherString );
setResultType( matcher.match( arg ) );
endExpression( expr );
}
} // namespace Catch
#endif // TWOBLUECUBES_CATCH_RESULT_BUILDER_H_INCLUDED

70
include/internal/catch_result_builder.hpp
View File

@@ -41,22 +41,10 @@ namespace Catch {
m_data.resultType = result ? ResultWas::Ok : ResultWas::ExpressionFailed;
return *this;
}
ResultBuilder& ResultBuilder::setLhs( std::string const& lhs ) {
m_exprComponents.lhs = lhs;
return *this;
}
ResultBuilder& ResultBuilder::setRhs( std::string const& rhs ) {
m_exprComponents.rhs = rhs;
return *this;
}
ResultBuilder& ResultBuilder::setOp( std::string const& op ) {
m_exprComponents.op = op;
return *this;
}
void ResultBuilder::endExpression() {
m_exprComponents.testFalse = isFalseTest( m_assertionInfo.resultDisposition );
captureExpression();
void ResultBuilder::endExpression( DecomposedExpression const& expr ) {
AssertionResult result = build( expr );
handleResult( result );
}
void ResultBuilder::useActiveException( ResultDisposition::Flags resultDisposition ) {
@@ -69,6 +57,7 @@ namespace Catch {
setResultType( resultType );
captureExpression();
}
void ResultBuilder::captureExpectedException( std::string const& expectedMessage ) {
if( expectedMessage.empty() )
captureExpectedException( Matchers::Impl::Generic::AllOf<std::string>() );
@@ -78,7 +67,7 @@ namespace Catch {
void ResultBuilder::captureExpectedException( Matchers::Impl::Matcher<std::string> const& matcher ) {
assert( m_exprComponents.testFalse == false );
assert( !isFalseTest( m_assertionInfo.resultDisposition ) );
AssertionResultData data = m_data;
data.resultType = ResultWas::Ok;
data.reconstructedExpression = m_assertionInfo.capturedExpression;
@@ -96,6 +85,7 @@ namespace Catch {
AssertionResult result = build();
handleResult( result );
}
void ResultBuilder::handleResult( AssertionResult const& result )
{
getResultCapture().assertionEnded( result );
@@ -107,6 +97,7 @@ namespace Catch {
m_shouldThrow = true;
}
}
void ResultBuilder::react() {
if( m_shouldThrow )
throw Catch::TestFailureException();
@@ -117,43 +108,32 @@ namespace Catch {
AssertionResult ResultBuilder::build() const
{
assert( m_data.resultType != ResultWas::Unknown );
return build( *this );
}
// CAVEAT: The returned AssertionResult stores a pointer to the argument expr,
// a temporary DecomposedExpression, which in turn holds references to
// operands, possibly temporary as well.
// It should immediately be passed to handleResult; if the expression
// needs to be reported, its string expansion must be composed before
// the temporaries are destroyed.
AssertionResult ResultBuilder::build( DecomposedExpression const& expr ) const
{
assert( m_data.resultType != ResultWas::Unknown );
AssertionResultData data = m_data;
// Flip bool results if testFalse is set
if( m_exprComponents.testFalse ) {
if( data.resultType == ResultWas::Ok )
data.resultType = ResultWas::ExpressionFailed;
else if( data.resultType == ResultWas::ExpressionFailed )
data.resultType = ResultWas::Ok;
// Flip bool results if FalseTest flag is set
if( isFalseTest( m_assertionInfo.resultDisposition ) ) {
data.negate( expr.isBinaryExpression() );
}
data.message = m_stream.oss.str();
data.reconstructedExpression = reconstructExpression();
if( m_exprComponents.testFalse ) {
if( m_exprComponents.op == "" )
data.reconstructedExpression = "!" + data.reconstructedExpression;
else
data.reconstructedExpression = "!(" + data.reconstructedExpression + ")";
}
data.decomposedExpression = &expr; // for lazy reconstruction
return AssertionResult( m_assertionInfo, data );
}
std::string ResultBuilder::reconstructExpression() const {
if( m_exprComponents.op == "" )
return m_exprComponents.lhs.empty() ? m_assertionInfo.capturedExpression : m_exprComponents.lhs;
else if( m_exprComponents.op == "matches" )
return m_exprComponents.lhs + " " + m_exprComponents.rhs;
else if( m_exprComponents.op != "!" ) {
if( m_exprComponents.lhs.size() + m_exprComponents.rhs.size() < 40 &&
m_exprComponents.lhs.find("\n") == std::string::npos &&
m_exprComponents.rhs.find("\n") == std::string::npos )
return m_exprComponents.lhs + " " + m_exprComponents.op + " " + m_exprComponents.rhs;
else
return m_exprComponents.lhs + "\n" + m_exprComponents.op + "\n" + m_exprComponents.rhs;
}
else
return "{can't expand - use " + m_assertionInfo.macroName + "_FALSE( " + m_assertionInfo.capturedExpression.substr(1) + " ) instead of " + m_assertionInfo.macroName + "( " + m_assertionInfo.capturedExpression + " ) for better diagnostics}";
void ResultBuilder::reconstructExpression( std::string& dest ) const {
dest = m_assertionInfo.capturedExpression;
}
} // end namespace Catch