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module fluentasserts.core.evaluation;
import std.datetime;
import std.typecons;
import std.traits;
import std.conv;
import std.range;
import std.array;
import std.algorithm : map, sort;
import fluentasserts.core.serializers;
import fluentasserts.core.results;
import fluentasserts.core.base : TestException;
///
struct ValueEvaluation {
/// The exception thrown during evaluation
Throwable throwable;
/// Time needed to evaluate the value
Duration duration;
/// Serialized value as string
string strValue;
/// Proxy object holding the evaluated value to help doing better comparisions
EquableValue proxyValue;
/// Human readable value
string niceValue;
/// The name of the type before it was converted to string
string[] typeNames;
/// Other info about the value
string[string] meta;
string typeName() @safe nothrow {
if(typeNames.length == 0) {
return "unknown";
}
return typeNames[0];
}
}
///
class Evaluation {
/// The id of the current evaluation
size_t id;
/// The value that will be validated
ValueEvaluation currentValue;
/// The expected value that we will use to perform the comparison
ValueEvaluation expectedValue;
/// The operation name
string operationName;
/// True if the operation result needs to be negated to have a successful result
bool isNegated;
/// The nice message printed to the user
MessageResult message;
/// The source code where the assert is located
SourceResult source;
/// Results generated during evaluation
IResult[] results;
/// The throwable generated by the evaluation
Throwable throwable;
/// True when the evaluation is done
bool isEvaluated;
}
///
auto evaluate(T)(lazy T testData) @trusted if(isInputRange!T && !isArray!T && !isAssociativeArray!T) {
return evaluate(testData.array);
}
///
auto evaluate(T)(lazy T testData) @trusted if(!isInputRange!T || isArray!T || isAssociativeArray!T) {
auto begin = Clock.currTime;
alias Result = Tuple!(T, "value", ValueEvaluation, "evaluation");
try {
auto value = testData;
alias TT = typeof(value);
static if(isCallable!T) {
if(value !is null) {
begin = Clock.currTime;
value();
}
}
auto duration = Clock.currTime - begin;
auto serializedValue = SerializerRegistry.instance.serialize(value);
auto niceValue = SerializerRegistry.instance.niceValue(value);
return Result(value, ValueEvaluation(null, duration, serializedValue, equableValue(value, niceValue), niceValue, extractTypes!TT ));
} catch(Throwable t) {
T result;
static if(isCallable!T) {
result = testData;
}
return Result(result, ValueEvaluation(t, Clock.currTime - begin, result.to!string, equableValue(result, result.to!string), result.to!string, extractTypes!T ));
}
}
/// evaluate a lazy value should capture an exception
unittest {
int value() {
throw new Exception("message");
}
auto result = evaluate(value);
assert(result.evaluation.throwable !is null);
assert(result.evaluation.throwable.msg == "message");
}
/// evaluate should capture an exception thrown by a callable
unittest {
void value() {
throw new Exception("message");
}
auto result = evaluate(&value);
assert(result.evaluation.throwable !is null);
assert(result.evaluation.throwable.msg == "message");
}
string[] extractTypes(T)() if((!isArray!T && !isAssociativeArray!T) || isSomeString!T) {
string[] types;
types ~= unqualString!T;
static if(is(T == class)) {
static foreach(Type; BaseClassesTuple!T) {
types ~= unqualString!Type;
}
}
static if(is(T == interface) || is(T == class)) {
static foreach(Type; InterfacesTuple!T) {
types ~= unqualString!Type;
}
}
return types;
}
string[] extractTypes(T: U[], U)() if(isArray!T && !isSomeString!T) {
return extractTypes!(U).map!(a => a ~ "[]").array;
}
string[] extractTypes(T: U[K], U, K)() {
string k = unqualString!(K);
return extractTypes!(U).map!(a => a ~ "[" ~ k ~ "]").array;
}
/// It can get the type of a string
unittest {
auto result = extractTypes!string;
assert(result == ["string"]);
}
/// It can get the type of a string list
unittest {
auto result = extractTypes!(string[]);
assert(result == ["string[]"]);
}
/// It can get the type of a string assoc array
unittest {
auto result = extractTypes!(string[string]);
assert(result == ["string[string]"]);
}
/// It can get all types of a class
unittest {
interface I {}
class T : I {}
auto result = extractTypes!(T[]);
assert(result[0] == "fluentasserts.core.evaluation.__unittest_L188_C1.T[]", `Expected: ` ~ result[0]);
assert(result[1] == "object.Object[]", `Expected: ` ~ result[1] );
assert(result[2] == "fluentasserts.core.evaluation.__unittest_L188_C1.I[]", `Expected: ` ~ result[2] );
}
/// A proxy type that allows to compare the native values
interface EquableValue {
@safe nothrow:
bool isEqualTo(EquableValue value);
EquableValue[] toArray();
string toString();
EquableValue generalize();
string getSerialized();
}
/// Wraps a value into equable value
EquableValue equableValue(T)(T value, string serialized) {
static if(isArray!T && !isSomeString!T) {
return new ArrayEquable!T(value, serialized);
} else static if(isInputRange!T && !isSomeString!T) {
return new ArrayEquable!T(value.array, serialized);
} else static if(isAssociativeArray!T) {
return new AssocArrayEquable!T(value, serialized);
} else {
return new ObjectEquable!T(value, serialized);
}
}
///
class ObjectEquable(T) : EquableValue {
private {
T value;
string serialized;
}
@trusted nothrow:
this(T value, string serialized) {
this.value = value;
this.serialized = serialized;
}
bool isEqualTo(EquableValue otherEquable) {
try {
auto other = cast(ObjectEquable) otherEquable;
if(other !is null) {
return value == other.value;
}
auto generalized = otherEquable.generalize;
static if(is(T == class)) {
auto otherGeneralized = cast(ObjectEquable!Object) generalized;
if(otherGeneralized !is null) {
return value == otherGeneralized.value;
}
}
return serialized == otherEquable.getSerialized;
} catch(Exception) {
return false;
}
}
string getSerialized() {
return serialized;
}
EquableValue generalize() {
static if(is(T == class)) {
auto obj = cast(Object) value;
if(obj !is null) {
return new ObjectEquable!Object(obj, serialized);
}
}
return new ObjectEquable!string(serialized, serialized);
}
EquableValue[] toArray() {
static if(__traits(hasMember, T, "byValue")) {
try {
return value.byValue.map!(a => a.equableValue(SerializerRegistry.instance.serialize(a))).array;
} catch(Exception) {}
}
return [ this ];
}
override string toString() {
return "Equable." ~ serialized;
}
override int opCmp (Object o) {
return -1;
}
}
/// an object with byValue method should return an array with all elements
unittest {
class TestObject {
auto byValue() {
auto items = [1, 2];
return items.inputRangeObject;
}
}
auto value = equableValue(new TestObject(), "[1, 2]").toArray;
assert(value.length == 2, "invalid length");
assert(value[0].toString == "Equable.1", value[0].toString ~ " != Equable.1");
assert(value[1].toString == "Equable.2", value[1].toString ~ " != Equable.2");
}
///
class ArrayEquable(U: T[], T) : EquableValue {
private {
T[] values;
string serialized;
}
@safe nothrow:
this(T[] values, string serialized) {
this.values = values;
this.serialized = serialized;
}
bool isEqualTo(EquableValue otherEquable) {
auto other = cast(ArrayEquable!U) otherEquable;
if(other is null) {
return false;
}
return serialized == other.serialized;
}
string getSerialized() {
return serialized;
}
@trusted EquableValue[] toArray() {
static if(is(T == void)) {
return [];
} else {
try {
auto newList = values.map!(a => equableValue(a, SerializerRegistry.instance.niceValue(a))).array;
return cast(EquableValue[]) newList;
} catch(Exception) {
return [];
}
}
}
EquableValue generalize() {
return this;
}
override string toString() {
return serialized;
}
}
///
class AssocArrayEquable(U: T[V], T, V) : ArrayEquable!(string[], string) {
this(T[V] values, string serialized) {
auto sortedKeys = values.keys.sort;
auto sortedValues = sortedKeys
.map!(a => SerializerRegistry.instance.niceValue(a) ~ `: ` ~ SerializerRegistry.instance.niceValue(values[a]))
.array;
super(sortedValues, serialized);
}
}