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LibJS: Implement standard semantics for relational operators (#2417)
Previously, the relational operators where casting any value to double and comparing the results according to C++ semantics. This patch makes the relational operators in JS behave according to the standard specification. Since we don't have BigInt yet, the implementation doesn't take it into account. Moved PreferredType from Object to Value. Value::to_primitive now passes preferred_type to Object::to_primitive.
This commit is contained in:
Marcin Gasperowicz
GitHub
parent
cbe506020b
commit
eadce65e04
Notes:
sideshowbarker
2024-07-19 06:02:00 +09:00
Author: https://github.com/nooga Commit: https://github.com/SerenityOS/serenity/commit/eadce65e044 Pull-request: https://github.com/SerenityOS/serenity/pull/2417 Reviewed-by: https://github.com/linusg ✅
5 changed files with 641 additions and 44 deletions
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@ -618,20 +618,20 @@ bool Object::has_own_property(PropertyName property_name) const
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return shape().lookup(property_name.as_string()).has_value();
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}
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Value Object::to_primitive(PreferredType preferred_type) const
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Value Object::to_primitive(Value::PreferredType preferred_type) const
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{
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Value result = js_undefined();
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switch (preferred_type) {
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case PreferredType::Default:
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case PreferredType::Number: {
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case Value::PreferredType::Default:
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case Value::PreferredType::Number: {
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result = value_of();
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if (result.is_object()) {
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result = to_string();
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}
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break;
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}
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case PreferredType::String: {
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case Value::PreferredType::String: {
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result = to_string();
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if (result.is_object())
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result = value_of();
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@ -97,14 +97,8 @@ public:
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void set_prototype(Object*);
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bool has_prototype(const Object* prototype) const;
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enum class PreferredType {
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Default,
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String,
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Number,
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};
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virtual Value value_of() const { return Value(const_cast<Object*>(this)); }
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virtual Value to_primitive(PreferredType preferred_type = PreferredType::Default) const;
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virtual Value to_primitive(Value::PreferredType preferred_type = Value::PreferredType::Default) const;
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virtual Value to_string() const;
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Value get_direct(size_t index) const { return m_storage[index]; }
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@ -27,6 +27,7 @@
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#include <AK/FlyString.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/Utf8View.h>
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#include <LibJS/Heap/Heap.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Accessor.h>
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@ -142,7 +143,7 @@ String Value::to_string(Interpreter& interpreter) const
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}
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if (is_object()) {
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auto primitive_value = as_object().to_primitive(Object::PreferredType::String);
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auto primitive_value = as_object().to_primitive(PreferredType::String);
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if (interpreter.exception())
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return {};
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return primitive_value.to_string(interpreter);
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@ -175,10 +176,10 @@ bool Value::to_boolean() const
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}
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}
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Value Value::to_primitive(Interpreter&) const
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Value Value::to_primitive(Interpreter&, PreferredType preferred_type) const
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{
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if (is_object())
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return as_object().to_primitive();
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return as_object().to_primitive(preferred_type);
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return *this;
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}
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@ -241,7 +242,7 @@ Value Value::to_number(Interpreter& interpreter) const
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interpreter.throw_exception<TypeError>("Can't convert symbol to number");
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return {};
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case Type::Object:
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auto primitive = m_value.as_object->to_primitive(Object::PreferredType::Number);
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auto primitive = m_value.as_object->to_primitive(PreferredType::Number);
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if (interpreter.exception())
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return {};
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return primitive.to_number(interpreter);
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@ -297,46 +298,34 @@ size_t Value::to_size_t(Interpreter& interpreter) const
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Value greater_than(Interpreter& interpreter, Value lhs, Value rhs)
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{
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auto lhs_number = lhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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auto rhs_number = rhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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return Value(lhs_number.as_double() > rhs_number.as_double());
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TriState relation = abstract_relation(interpreter, false, lhs, rhs);
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if (relation == TriState::Unknown)
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return Value(false);
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return Value(relation == TriState::True);
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}
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Value greater_than_equals(Interpreter& interpreter, Value lhs, Value rhs)
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{
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auto lhs_number = lhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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auto rhs_number = rhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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return Value(lhs_number.as_double() >= rhs_number.as_double());
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TriState relation = abstract_relation(interpreter, true, lhs, rhs);
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if (relation == TriState::Unknown || relation == TriState::True)
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return Value(false);
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return Value(true);
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}
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Value less_than(Interpreter& interpreter, Value lhs, Value rhs)
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{
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auto lhs_number = lhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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auto rhs_number = rhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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return Value(lhs_number.as_double() < rhs_number.as_double());
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TriState relation = abstract_relation(interpreter, true, lhs, rhs);
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if (relation == TriState::Unknown)
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return Value(false);
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return Value(relation == TriState::True);
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}
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Value less_than_equals(Interpreter& interpreter, Value lhs, Value rhs)
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{
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auto lhs_number = lhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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auto rhs_number = rhs.to_number(interpreter);
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if (interpreter.exception())
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return {};
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return Value(lhs_number.as_double() <= rhs_number.as_double());
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TriState relation = abstract_relation(interpreter, false, lhs, rhs);
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if (relation == TriState::Unknown || relation == TriState::True)
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return Value(false);
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return Value(true);
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}
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Value bitwise_and(Interpreter& interpreter, Value lhs, Value rhs)
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@ -673,4 +662,77 @@ bool abstract_eq(Interpreter& interpreter, Value lhs, Value rhs)
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return false;
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}
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TriState abstract_relation(Interpreter& interpreter, bool left_first, Value lhs, Value rhs)
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{
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Value x_primitive = {};
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Value y_primitive = {};
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if (left_first) {
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x_primitive = lhs.to_primitive(interpreter, Value::PreferredType::Number);
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if (interpreter.exception())
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return {};
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y_primitive = rhs.to_primitive(interpreter, Value::PreferredType::Number);
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if (interpreter.exception())
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return {};
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} else {
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y_primitive = lhs.to_primitive(interpreter, Value::PreferredType::Number);
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if (interpreter.exception())
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return {};
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x_primitive = rhs.to_primitive(interpreter, Value::PreferredType::Number);
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if (interpreter.exception())
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return {};
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}
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if (x_primitive.is_string() && y_primitive.is_string()) {
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auto x_string = x_primitive.as_string().string();
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auto y_string = y_primitive.as_string().string();
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if (x_string.starts_with(y_string))
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return TriState::False;
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if (y_string.starts_with(x_string))
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return TriState::True;
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Utf8View x_codepoints { x_string };
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Utf8View y_codepoints { y_string };
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for (auto k = x_codepoints.begin(), l = y_codepoints.begin();
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k != x_codepoints.end() && l != y_codepoints.end();
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++k, ++l) {
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if (*k != *l) {
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if (*k < *l) {
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return TriState::True;
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} else {
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return TriState::False;
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}
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}
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}
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ASSERT_NOT_REACHED();
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}
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// FIXME add BigInt cases here once we have BigInt
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auto x_numeric = x_primitive.to_number(interpreter);
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if (interpreter.exception())
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return {};
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auto y_numeric = y_primitive.to_number(interpreter);
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if (interpreter.exception())
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return {};
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if (x_numeric.is_nan() || y_numeric.is_nan())
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return TriState::Unknown;
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if (x_numeric.is_positive_infinity() || y_numeric.is_negative_infinity())
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return TriState::False;
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if (x_numeric.is_negative_infinity() || y_numeric.is_positive_infinity())
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return TriState::True;
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auto x_value = x_numeric.as_double();
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auto y_value = y_numeric.as_double();
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if (x_value < y_value)
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return TriState::True;
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else
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return TriState::False;
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}
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}
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@ -29,6 +29,7 @@
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#include <AK/Assertions.h>
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#include <AK/Forward.h>
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#include <AK/LogStream.h>
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#include <AK/Types.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/Symbol.h>
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@ -51,6 +52,12 @@ public:
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Accessor,
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};
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enum class PreferredType {
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Default,
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String,
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Number,
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};
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bool is_empty() const { return m_type == Type::Empty; }
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bool is_undefined() const { return m_type == Type::Undefined; }
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bool is_null() const { return m_type == Type::Null; }
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@ -66,6 +73,8 @@ public:
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bool is_nan() const { return is_number() && __builtin_isnan(as_double()); }
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bool is_infinity() const { return is_number() && __builtin_isinf(as_double()); }
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bool is_positive_infinity() const { return is_number() && __builtin_isinf_sign(as_double()) > 0; }
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bool is_negative_infinity() const { return is_number() && __builtin_isinf_sign(as_double()) < 0; }
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bool is_positive_zero() const { return is_number() && 1.0 / as_double() == __builtin_huge_val(); }
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bool is_negative_zero() const { return is_number() && 1.0 / as_double() == -__builtin_huge_val(); }
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bool is_integer() const { return is_finite_number() && (i32)as_double() == as_double(); }
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@ -201,7 +210,7 @@ public:
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String to_string(Interpreter&) const;
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PrimitiveString* to_primitive_string(Interpreter&);
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Value to_primitive(Interpreter&) const;
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Value to_primitive(Interpreter&, PreferredType preferred_type = PreferredType::Default) const;
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Object* to_object(Interpreter&) const;
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Value to_number(Interpreter&) const;
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double to_double(Interpreter&) const;
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@ -282,6 +291,7 @@ bool strict_eq(Interpreter&, Value lhs, Value rhs);
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bool same_value(Interpreter&, Value lhs, Value rhs);
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bool same_value_zero(Interpreter&, Value lhs, Value rhs);
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bool same_value_non_numeric(Interpreter&, Value lhs, Value rhs);
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TriState abstract_relation(Interpreter& interpreter, bool left_first, Value lhs, Value rhs);
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const LogStream& operator<<(const LogStream&, const Value&);
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531
Libraries/LibJS/Tests/binary-relational.js
Normal file
531
Libraries/LibJS/Tests/binary-relational.js
Normal file
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@ -0,0 +1,531 @@
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load("test-common.js");
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try {
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const vals = [
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1,
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2,
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[],
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[1],
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[2],
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[1, 2],
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"foo",
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"fooo",
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"🔥",
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"❤️",
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"bar",
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{},
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{ a: 1 },
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{ a: 2 },
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{ b: 1 },
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true,
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false,
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undefined,
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null,
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NaN,
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+Infinity,
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-Infinity,
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];
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// Each row contains: x_index, y_index, (x < y), (x > y), (x <= y), (x >= y)
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// where x = vals[x_index], y = vals[y_index]
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const table = [
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[0, 0, false, false, true, true],
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[0, 1, true, false, true, false],
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[0, 2, false, true, false, true],
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[0, 3, false, false, true, true],
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[0, 4, true, false, true, false],
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[0, 5, false, false, false, false],
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[0, 6, false, false, false, false],
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[0, 7, false, false, false, false],
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[0, 8, false, false, false, false],
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[0, 9, false, false, false, false],
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[0, 10, false, false, false, false],
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[0, 11, false, false, false, false],
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[0, 12, false, false, false, false],
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[0, 13, false, false, false, false],
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[0, 14, false, false, false, false],
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[0, 15, false, false, true, true],
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[0, 16, false, true, false, true],
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[0, 17, false, false, false, false],
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[0, 18, false, true, false, true],
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[0, 19, false, false, false, false],
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[0, 20, true, false, true, false],
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[0, 21, false, true, false, true],
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[1, 0, false, true, false, true],
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[1, 1, false, false, true, true],
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[1, 2, false, true, false, true],
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[1, 3, false, true, false, true],
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[1, 4, false, false, true, true],
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[1, 5, false, false, false, false],
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[1, 6, false, false, false, false],
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[1, 7, false, false, false, false],
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[1, 8, false, false, false, false],
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[1, 9, false, false, false, false],
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[1, 10, false, false, false, false],
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[1, 11, false, false, false, false],
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[1, 12, false, false, false, false],
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[1, 13, false, false, false, false],
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[1, 14, false, false, false, false],
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[1, 15, false, true, false, true],
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[1, 16, false, true, false, true],
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[1, 17, false, false, false, false],
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[1, 18, false, true, false, true],
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[1, 19, false, false, false, false],
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[1, 20, true, false, true, false],
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[1, 21, false, true, false, true],
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[2, 0, true, false, true, false],
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[2, 1, true, false, true, false],
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[2, 2, false, false, true, true],
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[2, 3, true, false, true, false],
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[2, 4, true, false, true, false],
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[2, 5, true, false, true, false],
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[2, 6, true, false, true, false],
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[2, 7, true, false, true, false],
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[2, 8, true, false, true, false],
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[2, 9, true, false, true, false],
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[2, 10, true, false, true, false],
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[2, 11, true, false, true, false],
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[2, 12, true, false, true, false],
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[2, 13, true, false, true, false],
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[2, 14, true, false, true, false],
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[2, 15, true, false, true, false],
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[2, 16, false, false, true, true],
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[2, 17, false, false, false, false],
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[2, 18, false, false, true, true],
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[2, 19, false, false, false, false],
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[2, 20, true, false, true, false],
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[2, 21, false, true, false, true],
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[3, 0, false, false, true, true],
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[3, 1, true, false, true, false],
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[3, 2, false, true, false, true],
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[3, 3, false, false, true, true],
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[3, 4, true, false, true, false],
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[3, 5, true, false, true, false],
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[3, 6, true, false, true, false],
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[3, 7, true, false, true, false],
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[3, 8, true, false, true, false],
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[3, 9, true, false, true, false],
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[3, 10, true, false, true, false],
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[3, 11, true, false, true, false],
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[3, 12, true, false, true, false],
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[3, 13, true, false, true, false],
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[3, 14, true, false, true, false],
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[3, 15, false, false, true, true],
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[3, 16, false, true, false, true],
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[3, 17, false, false, false, false],
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[3, 18, false, true, false, true],
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[3, 19, false, false, false, false],
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[3, 20, true, false, true, false],
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[3, 21, false, true, false, true],
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[4, 0, false, true, false, true],
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[4, 1, false, false, true, true],
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[4, 2, false, true, false, true],
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[4, 3, false, true, false, true],
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[4, 4, false, false, true, true],
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[4, 5, false, true, false, true],
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[4, 6, true, false, true, false],
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[4, 7, true, false, true, false],
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[4, 8, true, false, true, false],
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[4, 9, true, false, true, false],
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[4, 10, true, false, true, false],
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[4, 11, true, false, true, false],
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[4, 12, true, false, true, false],
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[4, 13, true, false, true, false],
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[4, 14, true, false, true, false],
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[4, 15, false, true, false, true],
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[4, 16, false, true, false, true],
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[4, 17, false, false, false, false],
|
||||
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||||
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||||
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|
||||
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||||
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|
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
[20, 20, false, false, true, true],
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
[21, 4, true, false, true, false],
|
||||
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|
||||
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|
||||
[21, 7, false, false, false, false],
|
||||
[21, 8, false, false, false, false],
|
||||
[21, 9, false, false, false, false],
|
||||
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|
||||
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|
||||
[21, 12, false, false, false, false],
|
||||
[21, 13, false, false, false, false],
|
||||
[21, 14, false, false, false, false],
|
||||
[21, 15, true, false, true, false],
|
||||
[21, 16, true, false, true, false],
|
||||
[21, 17, false, false, false, false],
|
||||
[21, 18, true, false, true, false],
|
||||
[21, 19, false, false, false, false],
|
||||
[21, 20, true, false, true, false],
|
||||
[21, 21, false, false, true, true],
|
||||
];
|
||||
|
||||
for (let test of table) {
|
||||
let x = vals[test[0]];
|
||||
let y = vals[test[1]];
|
||||
|
||||
assert(x < y === test[2]);
|
||||
assert(x > y === test[3]);
|
||||
assert(x <= y === test[4]);
|
||||
assert(x >= y === test[5]);
|
||||
}
|
||||
|
||||
console.log("PASS");
|
||||
} catch (e) {
|
||||
console.log("FAIL: " + e);
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue