Property in

Gets or sets the that is called when a node is started.

Property in

Gets a dictionary that maps CLR types to their corresponding Yarn types.

Property in

Gets the text of the command.

Method in

Unloads all nodes from the Dialogue.

Property in Dialogue

Summary

Gets or sets the CommandHandler that is called when a command is to be delivered to the game.

public CommandHandler CommandHandler
{
            get; set; }

Property in Dialogue

Summary

Gets the name of the node that this Dialogue is currently executing.

public string CurrentNode
{
            get; }

Remarks

If Continue() has never been called, this value will be null .

Property in IType

Summary

Gets the name of this type.

string Name { get; }

Property in Dialogue

Summary

Gets a value indicating whether the Dialogue is currently executing Yarn instructions.

public bool IsActive { get };

Property in Dialogue

Summary

Invoked when the Dialogue needs to report debugging information.

public Logger LogDebugMessage { get; set; }

Property in FunctionType

Summary

Gets the parent of this type.

public IType Parent { get; }

Remarks

All types have Any as their ultimate parent type (except for Any itself.)

Property in BuiltinTypes

Summary

Gets the type representing strings.

public static IType String { get; };

Property in Option

Summary

Gets the identifying number for this option.

public int ID { get; private set; }

Remarks

When the user selects this option, this value should be used as the parameter for SetSelectedOption(int) .

Method in MemoryVariableStore

Summary

Stores a bool in this VariableStorage.

public void SetValue(string variableName, bool boolValue)

Parameters

Method in

Starts, or continues, execution of the current Program.

This method repeatedly executes instructions until one of the following conditions is encountered:

• The or is called. After calling either of these handlers, the Dialogue will wait until is called. Continue may be called from inside the or , or may be called at any future time.

Method in

Returns the string ID that contains the original, uncompiled source text for a node.

A node's source text will only be present in the string table if its tags header contains rawText.

Because the class is designed to be unaware of the contents of the string table, this method does not test to see if the string table contains an entry with the line ID. You will need to test for that yourself.

Method in

Loads the nodes from the specified , and adds them to the nodes already loaded.

If Yarn.Dialogue.Program is null , this method has the effect as calling .

Interface in

Defines properties that describe a type in the Yarn language.

Method in

Gets a value indicating whether a specified node exists in the Program.

Property in

The list of instructions in this node.

Property in

Gets the type of value that this function returns.

Property in

Gets or sets the that is called when a set of options are ready to be shown to the user.

The Options Handler delivers an to the game. Before can be called to resume execution, must be called to indicate which was selected by the user. If is not called, an exception is thrown.

Property in

the entry in the program's string table that contains the original text of this node; null if this is not available

Property in

Gets a more verbose description of this type.

Property in

Gets the list of the parameter types that this function is called with.

The length of this list also determines the number of parameters this function accepts (also known as the function's arity ).

Class in

Inherits from System.Exception

An exception that is thrown by when there is an error in executing a .

Struct in

Inherits from System.ValueType

A command, sent from the to the game.

You do not create instances of this struct yourself. They are created by the during program execution.

Property in

Gets a more verbose description of this type.

Property in

Gets or sets the that is called when a line is ready to be shown to the user.

Property in

Gets the type representing numbers.

Property in

Gets the name of the node that will be run if this option is selected.

The value of this property not be valid if this is a shortcut option.

Property in

Gets the parent of this type.

All types have as their ultimate parent type (except for itself.)

Delegate in

Inherits from System.MulticastDelegate

Represents the method that is called when the Dialogue begins executing a node.

Method in

Removes all variables from storage.

Constructor in

Initializes a new instance of the class.

Property in

Gets the collection of methods that are available on this type.

Property in

Gets or sets the that is called when a node is complete.

Property in

The tags associated with this node.

Property in

Gets or sets the 's locale, as an IETF BCP 47 code.

This code is used to determine how the plural and ordinal markers determine the plural class of numbers.

For example, the code "en-US" represents the English language as used in the United States.

Delegate in

Inherits from System.MulticastDelegate

Represents a method that receives diagnostic messages and error information from a .

The text that this delegate receives may be output to a console, or sent to a log.

Method in

Stores a float in this VariableStorage.

Property in

Gets the collection of methods that are available on this type.

Method in

Immediately stops the .

The will not be called if the dialogue is ended by calling .

Property in

Gets or sets the that is called when the dialogue reaches its end.

Method in

Removes all variables from storage.

Property in

Gets the names of the nodes in the currently loaded Program.

Method in

Stores a bool in this VariableStorage.

Field in

The string ID for this line.

Method in

Returns a System.Delegate with a given name.

Method in

Stores a float in this VariableStorage.

Field in

The values that should be inserted into the user-facing text before delivery.

Property in

Gets the s that should be presented to the user.

• : An option to be presented to the user.

Property in

Gets or sets the that is called when the dialogue anticipates delivering some lines.

Method in

Method in

Loads functions from another .

If the other library contains a function with the same name as one in this library, the function in the other library takes precedence.

Method in

Stores a string in this VariableStorage.

Property in

Invoked when the Dialogue needs to report an error.

Method in

Gets a value indicating whether this contains a function named name .

Property in

A jump table, mapping the names of labels to positions in the instructions list.

Property in

Gets the type representing any value.

Property in

Gets a value indicating whether the player should be permitted to select this option.

If this value is false, this option had a line condition on it that failed. The option will still be delivered to the game, but, depending on the needs of the game, the game may decide to not allow the player to select it, or not offer it to the player at all.

This is intended for situations where games wish to show options that the player _could_ have taken, if some other condition had been met (e.g. having enough "charisma" points).

Property in

Gets the that should be presented to the user for this option.

See the documentation for the class for information on how to prepare a line before presenting it to the user.

Property in Node

Summary

The name of this node.

public string Name {
      get; set; }

Field in Dialogue

Summary

The node that execution will start from.

public const string DefaultStartNodeName = "Start";

Property in Dialogue

Summary

Gets the Library that this Dialogue uses to locate functions.

public Library Library { get; internal set; }

Remarks

When the Dialogue is constructed, the Library is initialized with the built-in operators like + , - , and so on.

Class in Yarn

Inherits from System.Object

Summary

A type that represents functions.

public class FunctionType : IType

Remarks

Functions have parameters and a return type, and can be called from script. Instances of this type are created when the host application registers new functions (such as through using the RegisterFunction(string,Delegate) methods or similar.)

Properties

Method in Dialogue

Summary

Parses a line of text, and produces a MarkupParseResult containing the results.

public MarkupParseResult ParseMarkup(string line)

Remarks

The MarkupParseResult 's Text will have any select , plural or ordinal markers replaced with the appropriate text, following this Dialogue 's LanguageCode .

Parameters

The results of parsing the markup.

Delegate in Yarn

Inherits from System.MulticastDelegate

Summary

Represents the method that is called when the Dialogue delivers a Command .

public delegate void CommandHandler(Command command);

Parameters

• : Represents the method that is called when the Dialogue delivers a .

• : Represents the method that is called when the Dialogue delivers an .

• : Represents the method that is called when the Dialogue begins executing a node.

Method in Dialogue

Summary

Signals to the Dialogue that the user has selected a specified Option .

public void SetSelectedOption(int selectedOptionID)

Remarks

After the Dialogue delivers an OptionSet, this method must be called before Continue() is called.

The ID number that should be passed as the parameter to this method should be the ID field in the Option that represents the user's selection.

Parameters

• : Represents the method that is called when the Dialogue delivers an .

• : A set of s, sent from the to the game.

• : Starts, or continues, execution of the current Program.

Delegate in Yarn

Inherits from System.MulticastDelegate

Summary

Represents the method that is called when the dialogue has reached its end, and no more code remains to be run.

public delegate void DialogueCompleteHandler();

See Also

• LineHandler: Represents the method that is called when the Dialogue delivers a Line .

• : Represents the method that is called when the Dialogue delivers an .

• : Represents the method that is called when the Dialogue delivers a .

• : Represents the method that is called when the Dialogue begins executing a node.

• : Represents the method that is called when the Dialogue reaches the end of a node.

Struct in OptionSet

Inherits from System.ValueType

Summary

An option to be presented to the user.

public struct Option

Properties

Method in Dialogue

Summary

Replaces all substitution markers in a text with the given substitution list.

public static string ExpandSubstitutions(string text, IList<string> substitutions)

Remarks

This method replaces substitution markers - for example, {0}

• with the corresponding entry in substitutions . If text contains a substitution marker whose index is not present in substitutions , it is ignored.

Parameters

text , with the content from substitutions inserted.

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction(string name, Delegate implementation)

Parameters

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<T1, T2, T3, T4, T5, TResult>(string name, Func<T1, T2, T3, T4, T5, TResult> implementation)

Parameters

Method in IVariableStorage

Summary

Retrieves a value of type T by name.

bool TryGetValue<T>(string variableName, out T result);

Parameters

true if a value named variableName of type T was retrieved; false otherwise.

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<T1, TResult>(string name, Func<T1, TResult> implementation)

Parameters

Delegate in Yarn

Inherits from System.MulticastDelegate

Summary

Represents the method that is called when the Dialogue reaches the end of a node.

public delegate void NodeCompleteHandler(string completedNodeName);

Remarks

This method may be called multiple times over the course of code execution. A node being complete does not necessarily represent the end of the conversation.

Parameters

• : Represents the method that is called when the Dialogue delivers a .

• : Represents the method that is called when the Dialogue delivers an .

• : Represents the method that is called when the Dialogue delivers a .

Struct in Yarn

Inherits from System.ValueType

Summary

A set of Option s, sent from the Dialogue to the game.

public struct OptionSet

Remarks

You do not create instances of this struct yourself. They are created by the Dialogue during program execution.

Properties

• : Gets or sets the that is called when a set of options are ready to be shown to the user.

Summary

Contains classes for working with compiled Yarn programs.

Classes

Interface in Yarn

Summary

Provides a mechanism for storing and retrieving instances of the Yarn.Value class.

public interface IVariableStorage

Methods

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<T1, T2, TResult>(string name, Func<T1, T2, TResult> implementation)

Parameters

Class in Yarn

Inherits from System.Object

Summary

A simple concrete implementation of IVariableStorage that keeps all variables in memory.

public class MemoryVariableStore : IVariableStorage

Methods

Delegate in Yarn

Inherits from System.MulticastDelegate

Summary

Represents the method that is called when the Dialogue delivers a Line .

public delegate void LineHandler(Line line);

Parameters

• : Represents the method that is called when the Dialogue delivers an .

• : Represents the method that is called when the Dialogue delivers a .

• : Represents the method that is called when the Dialogue begins executing a node.

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<T1, T2, T3, TResult>(string name, Func<T1, T2, T3, TResult> implementation)

Parameters

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<TResult>(string name, Func<TResult> implementation)

Parameters

Method in Library

Summary

Registers a new function that returns a value, which can be called from a Yarn program.

public void RegisterFunction<T1, T2, T3, T4, TResult>(string name, Func<T1, T2, T3, T4, TResult> implementation)

Parameters

Method in Dialogue

Summary

Loads all nodes from the provided Program .

public void SetProgram(Program program)

Remarks

This method replaces any existing nodes have been loaded. If you want to load nodes from an additional Program, use the AddProgram(Program) method.

Parameters

Method in Dialogue

Summary

Prepares the Dialogue that the user intends to start running a node.

public void SetNode(string startNode = DefaultStartNodeName)

Remarks

After this method is called, you call Continue() to start executing it.

If PrepareForLinesHandler has been set, it may be called when this method is invoked, as the Dialogue determines which lines may be delivered during the startNode node's execution.

Parameters

Method in IVariableStorage

Summary

Stores a string in this VariableStorage.

void SetValue(string variableName, string stringValue);

Parameters

Method in Library

Summary

Removes a function from the Library.

public void DeregisterFunction(string name)

Remarks

If no function with the given name is present in the Library, this method does nothing.

Parameters

Struct in

Inherits from System.ValueType

A line of dialogue, sent from the to the game.

When the game receives a , it should do the following things to prepare the line for presentation to the user.

1. Use the value in the field to look up the appropriate user-facing text in the string table.

Property in BuiltinTypes

Summary

Gets the type representing boolean values.

public static IType Boolean { get; };

Class in Yarn

Inherits from System.Object

Summary

A collection of functions that can be called from Yarn programs.

public class Library

Remarks

You do not create instances of this class yourself. The Dialogue class creates one of its own, which you can access via the Library property.

Methods

• : Co-ordinates the execution of Yarn programs.

Class in Yarn

Inherits from System.Object

Summary

Co-ordinates the execution of Yarn programs.

public class Dialogue : IAttributeMarkerProcessor

Constructors

Class in Yarn

Inherits from System.Object

Summary

A node of Yarn script, contained within a Program , and containing Yarn.Instruction s.

public class Node

Methods

Method in Dialogue

Summary

Returns the tags for the node nodeName .

public IEnumerable<string> GetTagsForNode(string nodeName)

Remarks

The tags for a node are defined by setting the tags header in the node's source code. This header must be a space-separated list.

Parameters

The node's tags, or null if the node is not present in the Program.

Property in

Gets the name of this type.

Class in Yarn

Inherits from System.Object

Summary

Contains the built-in types available in the Yarn language.

public static class BuiltinTypes

Properties

Method in MemoryVariableStore

Summary

Retrieves a value of type T by name.

public bool TryGetValue<T>(string variableName, out T result)

Parameters

true if a value named variableName of type T was retrieved; false otherwise.

Property in

Gets or sets the object that provides access to storing and retrieving the values of variables.