Enum dmntk_feel::values::Value

pub enum Value {
    Boolean(bool),
    BuiltInFunction(Bif),
    Context(FeelContext),
    ContextEntry(Name, Box<Value>),
    ContextEntryKey(Name),
    ContextType(FeelType),
    ContextTypeEntry(Name, FeelType),
    ContextTypeEntryKey(Name),
    Date(FeelDate),
    DateTime(FeelDateTime),
    DaysAndTimeDuration(FeelDaysAndTimeDuration),
    ExpressionList(Values),
    ExternalJavaFunction(String, String),
    ExternalPmmlFunction(String, String),
    FeelType(FeelType),
    FormalParameter(Name, FeelType),
    FormalParameters(Vec<(Name, FeelType)>),
    FunctionBody(FunctionBody, bool),
    FunctionDefinition(Vec<(Name, FeelType)>, FunctionBody, bool, Closure, FeelContext, FeelType),
    IntervalEnd(Box<Value>, bool),
    IntervalStart(Box<Value>, bool),
    Irrelevant,
    List(Values),
    NamedParameter(Box<Value>, Box<Value>),
    NamedParameters(BTreeMap<Name, (Value, usize)>),
    NegatedCommaList(Values),
    Null(Option<String>),
    Number(FeelNumber),
    ParameterName(Name),
    ParameterTypes(Vec<Value>),
    PositionalParameters(Values),
    QualifiedNameSegment(Name),
    Range(Box<Value>, bool, Box<Value>, bool),
    String(String),
    Time(FeelTime),
    UnaryGreater(Box<Value>),
    UnaryGreaterOrEqual(Box<Value>),
    UnaryLess(Box<Value>),
    UnaryLessOrEqual(Box<Value>),
    YearsAndMonthsDuration(FeelYearsAndMonthsDuration),
}

FEEL value.

Variants

Boolean(bool)

Value representing FEEL boolean type.

BuiltInFunction(Bif)

Value for storing built-in function definition.

Context(FeelContext)

Value representing a context.

ContextEntry(Name, Box<Value>)

Value representing a context entry.

ContextEntryKey(Name)

Value representing a key of the context entry.

ContextType(FeelType)

Value representing the context type.

ContextTypeEntry(Name, FeelType)

Value representing a context entry in context type definition.

ContextTypeEntryKey(Name)

Value representing a key of the context entry in context type definition.

Date(FeelDate)

Value for storing dates as FeelDate.

DateTime(FeelDateTime)

Value for storing date and time as FeelDateTime.

DaysAndTimeDuration(FeelDaysAndTimeDuration)

Value for days and time durations.

ExpressionList(Values)

Value representing a collection of comma-separated list of expressions.

ExternalJavaFunction(String, String)

Tuple Fields

0: String

Class name.

1: String

Method signature.

Value representing a mapping to externally defined Java function.

ExternalPmmlFunction(String, String)

Tuple Fields

0: String

Document.

1: String

Model name.

Value representing a mapping to externally defined PMML function.

FeelType(FeelType)

Value representing the FEEL type of a value.

FormalParameter(Name, FeelType)

Value representing function’s formal parameter with name and type.

FormalParameters(Vec<(Name, FeelType)>)

List of formal parameters.

FunctionBody(FunctionBody, bool)

Tuple Fields

0: FunctionBody

Body of the function.

1: bool

Flag indicating if the function’s body is an external function, true == external.

Definition of the function body.

FunctionDefinition(Vec<(Name, FeelType)>, FunctionBody, bool, Closure, FeelContext, FeelType)

Tuple Fields

0: Vec<(Name, FeelType)>

Formal parameters of the function.

1: FunctionBody

Body of the function.

2: bool

Flag indicating if the function’s body is an external function, true == external.

3: Closure

Closed names from function context (closure names).

4: FeelContext

Values of the closed names (closure values).

5: FeelType

Return type of the function.

Value representing the function definition. This value holds the list of function’s formal parameters, the function’s body, closure for lambdas and expected result type.

IntervalEnd(Box<Value>, bool)

Value representing interval end.

IntervalStart(Box<Value>, bool)

Value representing interval start.

Irrelevant

Value representing FEEL irrelevant value.

List(Values)

Value representing a list of values.

NamedParameter(Box<Value>, Box<Value>)

Named parameter.

NamedParameters(BTreeMap<Name, (Value, usize)>)

Value representing a collection of named parameters.

NegatedCommaList(Values)

Value representing a collection of values representing a negated comma-separated list of expressions.

Null(Option<String>)

Null value with optional tracing message.

Number(FeelNumber)

Value representing FEEL number type.

ParameterName(Name)

Name of the parameter.

ParameterTypes(Vec<Value>)

Value representing a list of function’s parameter types.

PositionalParameters(Values)

List of positional parameters.

QualifiedNameSegment(Name)

Value representing a segment of a qualified name.

Range(Box<Value>, bool, Box<Value>, bool)

Value representing a range.

String(String)

String value…

Time(FeelTime)

Value for storing time as FeelTime.

UnaryGreater(Box<Value>)

UnaryGreater value…

UnaryGreaterOrEqual(Box<Value>)

UnaryGreaterOrEqual value…

UnaryLess(Box<Value>)

UnaryLess value…

UnaryLessOrEqual(Box<Value>)

UnaryLessOrEqual value…

YearsAndMonthsDuration(FeelYearsAndMonthsDuration)

Value for storing years and months duration.

Implementations

impl Value

pub fn is_null(&self) -> bool

Returns true when the value is of type Value::Null.

pub fn is_true(&self) -> bool

Returns true when the value is of type Value::Boolean and is equal to true.

pub fn is_number(&self) -> bool

Returns true when the value is of type Value::Number.

pub fn type_of(&self) -> FeelType

Returns the type of this Value.

pub fn is_conformant(&self, target_type: &FeelType) -> bool

Checks if a value is conformant with specified target type.

pub fn coerced(&self, target_type: &FeelType) -> Value

Returns value coerced to specified type. When a value appears in a certain context, it must be compatible with a type expected in that context, called the target type. After the type of the value is known, an implicit conversion from the type of the value to the target type can be performed. If an implicit conversion is mandatory but it cannot be performed, the result is null.

There are several possible type conversions:

• to singleton list:

  When the type of the value is T and the target type is List<T>, the simple value is converted to a singleton list.

• from singleton list:

  When the type of the value is List<T>, and the value is a singleton list and the target type is T, the value is converted by unwrapping the first element.

• conforms to:

  When the type of the value is T1, the target type is T2, and T1 conforms to T2, the value remains unchanged. Otherwise the result is null.

All these conversion rules are implemented in this function.

pub fn try_from_xsd_integer(text: &str) -> Result<Self>

Tries to convert xsd:integer string into valid Value representing a number.

pub fn try_from_xsd_decimal(text: &str) -> Result<Self>

Tries to convert xsd:decimal string into valid Value representing a number.

pub fn try_from_xsd_double(text: &str) -> Result<Self>

Tries to convert xsd:double string into valid Value representing a number.

pub fn try_from_xsd_boolean(text: &str) -> Result<Self>

Tries to convert xsd:boolean string into valid Value representing a boolean.

pub fn try_from_xsd_date(text: &str) -> Result<Self>

Tries to convert xsd:date string into valid Value representing a date. FEEL date format is fully conformant with xsd:date.

pub fn try_from_xsd_time(text: &str) -> Result<Self>

Tries to convert xsd:time string into valid Value representing a time. FEEL time format is fully conformant with xsd:time.

pub fn try_from_xsd_date_time(text: &str) -> Result<Self>

Tries to convert xsd:dateTime string into valid Value representing a date and time. FEEL date and time format is fully conformant with xsd:dateTime.

pub fn try_from_xsd_duration(text: &str) -> Result<Self>

Tries to convert xsd:duration string into valid Value representing a date and time. FEEL durations are conformant with xsd:duration but spit into two ranges.

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Value

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Value

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Converts Value into string.

impl From<FeelContext> for Value

fn from(ctx: FeelContext) -> Self

Converts this FeelContext to its Value representation.

impl Jsonify for Value

fn jsonify(&self) -> String

Converts a Value into JSON.

impl PartialEq<Value> for Value

fn eq(&self, other: &Value) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ToFeelString for Value

fn to_feel_string(&self) -> String

Converts Value into FEEL string.

impl TryFrom<Value> for FeelContext

fn try_from(value: Value) -> Result<Self, Self::Error>

Tries to convert a Value to its FeelContext representation.

type Error = DmntkError

The type returned in the event of a conversion error.

impl StructuralPartialEq for Value