Expression class
An expression is the fundamental unit of computation in ball. Every computation is represented as an expression tree.
- Available extensions
Constructors
- Expression({FunctionCall? call, Literal? literal, Reference? reference, FieldAccess? fieldAccess, MessageCreation? messageCreation, Block? block, FunctionDefinition? lambda})
-
factory
-
Expression.fromBuffer(List<
int> data, [ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) -
factory
- Expression.fromJson(String json, [ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY])
-
factory
Properties
- block ↔ Block
-
A block of statements with a result expression
getter/setter pair
- call ↔ FunctionCall
-
Call a function with an input expression
getter/setter pair
- fieldAccess ↔ FieldAccess
-
Access a field of a message expression
getter/setter pair
- hashCode → int
-
Calculates a hash code based on the contents of the protobuf.
no setterinherited
- info_ → BuilderInfo
-
no setter
- isFrozen → bool
-
Returns
trueif this message is marked read-only. Otherwisefalse.no setterinherited - lambda ↔ FunctionDefinition
-
An anonymous function / closure (name is empty).
Cross-language: JS arrow functions, Python lambdas, Kotlin lambdas,
Swift closures, C# delegates/lambdas, Rust closures, etc.
A lambda is just a FunctionDefinition with name = "".
getter/setter pair
- literal ↔ Literal
-
A literal value (int, double, string, bool, list)
getter/setter pair
- messageCreation ↔ MessageCreation
-
Construct a new message instance
getter/setter pair
- reference ↔ Reference
-
A reference to a variable by name
getter/setter pair
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- unknownFields → UnknownFieldSet
-
no setterinherited
Methods
-
addExtension(
Extension extension, Object? value) → void -
Adds an extension field value to a repeated field.
inherited
-
check(
) → void -
Throws a StateError if the message has required fields without a value.
inherited
-
clear(
) → void -
Clears all data that was set in this message.
inherited
-
clearBlock(
) → void -
clearCall(
) → void -
clearExpr(
) → void -
clearExtension(
Extension extension) → void -
Clears an extension field and also removes the extension.
inherited
-
clearField(
int tagNumber) → void -
Clears the contents of a given field.
inherited
-
clearFieldAccess(
) → void -
clearLambda(
) → void -
clearLiteral(
) → void -
clearMessageCreation(
) → void -
clearReference(
) → void -
clone(
) → Expression - Creates a deep copy of the fields in this message.
-
copyWith(
void updates(Expression)) → Expression -
Apply
updatesto a copy of this message. -
createEmptyInstance(
) → Expression - Creates an empty instance of the same message type as this.
-
deepCopy(
) → T -
Available on T, provided by the GeneratedMessageGenericExtensions extension
Returns a writable deep copy of this message. -
ensureBlock(
) → Block -
ensureCall(
) → FunctionCall -
ensureFieldAccess(
) → FieldAccess -
ensureLambda(
) → FunctionDefinition -
ensureLiteral(
) → Literal -
ensureMessageCreation(
) → MessageCreation -
ensureReference(
) → Reference -
extensionsAreInitialized(
) → bool -
inherited
-
freeze(
) → GeneratedMessage -
Make this message read-only.
inherited
-
getDefaultForField(
int tagNumber) → dynamic -
Returns the default value for the given field.
inherited
-
getExtension(
Extension extension) → dynamic -
Returns the value of
extension.inherited -
getField(
int tagNumber) → dynamic -
Returns the value of the field associated with
tagNumber, or the default value if it is not set.inherited -
getFieldOrNull(
int tagNumber) → dynamic -
Returns the value of a field, ignoring any defaults.
inherited
-
getTagNumber(
String fieldName) → int? -
inherited
-
hasBlock(
) → bool -
hasCall(
) → bool -
hasExtension(
Extension extension) → bool -
Returns
trueif a value ofextensionis present.inherited -
hasField(
int tagNumber) → bool -
Whether this message has a field associated with
tagNumber.inherited -
hasFieldAccess(
) → bool -
hasLambda(
) → bool -
hasLiteral(
) → bool -
hasMessageCreation(
) → bool -
hasReference(
) → bool -
hasRequiredFields(
) → bool -
Whether the message has required fields.
inherited
-
isInitialized(
) → bool -
Whether all required fields in the message and embedded messages are set.
inherited
-
mergeFromBuffer(
List< int> input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void -
Merges serialized protocol buffer data into this message.
inherited
-
mergeFromCodedBufferReader(
CodedBufferReader input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void -
Same as
mergeFromBuffer, but takes aCodedBufferReaderinput.inherited -
mergeFromJson(
String data, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void -
Merges field values from
data, a JSON object, encoded as described byGeneratedMessage.writeToJson.inherited -
mergeFromJsonMap(
Map< String, dynamic> json, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void -
Merges field values from a JSON object represented as a Dart map.
inherited
-
mergeFromMessage(
GeneratedMessage other) → void -
Merges the contents of the
otherinto this message.inherited -
mergeFromProto3Json(
Object? json, {TypeRegistry typeRegistry = const TypeRegistry.empty(), bool ignoreUnknownFields = false, bool supportNamesWithUnderscores = true, bool permissiveEnums = false}) → void -
Merges field values from
json, a JSON object using proto3 encoding.inherited -
mergeUnknownFields(
UnknownFieldSet unknownFieldSet) → void -
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
rebuild(
void updates(T)) → T -
Available on T, provided by the GeneratedMessageGenericExtensions extension
Applyupdatesto a copy of this message. -
setExtension(
Extension extension, Object value) → void -
Sets the value of a non-repeated extension field to
value.inherited -
setField(
int tagNumber, Object value) → void -
Sets the value of a field by its
tagNumber.inherited -
toBuilder(
) → GeneratedMessage -
Creates a writable, shallow copy of this message.
inherited
-
toDebugString(
) → String -
Returns a String representation of this message.
inherited
-
toProto3Json(
{TypeRegistry typeRegistry = const TypeRegistry.empty()}) → Object? -
Returns an Object representing Proto3 JSON serialization of
this.inherited -
toString(
) → String -
Returns a String representation of this message.
inherited
-
whichExpr(
) → Expression_Expr -
writeToBuffer(
) → Uint8List -
Serialize the message as the protobuf binary format.
inherited
-
writeToCodedBufferWriter(
CodedBufferWriter output) → void -
Same as
writeToBuffer, but serializes to the givenCodedBufferWriter.inherited -
writeToJson(
) → String -
Returns a JSON string that encodes this message.
inherited
-
writeToJsonMap(
) → Map< String, dynamic> -
Returns the JSON encoding of this message as a Dart Map.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
create(
) → Expression -
getDefault(
) → Expression