Parse Nodes

There are five types of nodes in E-HowNet expression — Entity, Feature, Function, Restriction, and Root.

Major Nodes

class EhnParseNode

The prototype of E-HowNet parsing nodes.

head: str

The head of this node.

get_features()

Get the features (or [] if not exists)

get_arguments()

Get the arguments (or [] if not exists)

get_value()

Get the value (or None if not exists)

get_function()

Get the function (or None if not exists)

get_anchor()

Get the anchor (or None if not exists)

children()

Yields all direct child nodes of this node.

descendant()

Yields all descendant nodes (including self) of this node.

decode()

Converts to text representation.

tree() → treelib.Tree

Generates a tree representation of this node and all its descendant nodes.

Entity

class EhnParseEntityBase

The base class of E-HowNet parsing entity nodes.

Subclasses:

• EhnParseNormalEntity A normal entity. Can be an anchor.

• EhnParseFunctionEntity An entity with function head. Can be an anchor.

• EhnParseAnyEntity A placeholder entity.

• EhnParseNameEntity A name entity.

• EhnParseNumberEntity A number entity.

• EhnParseTildeEntity An entity refers to the parent entity.

• EhnParseCoindexEntity An entity refers to an anchor entity.

property features

A list of Features.

Feature

class EhnParseFeatureBase

The base class of E-HowNet parsing feature nodes.

Subclasses:

• EhnParseNormalFeature A normal feature.

• EhnParseFunctionFeature An feature with function head.

property value

Can be either Entity or Restriction.

Function

class EhnParseFunctionBase

The base class of E-HowNet parsing function nodes.

Subclasses:

• EhnParseFunction.

property arguments

A list of Entities or Restriction

Restriction

class EhnParseRestrictionBase

The base class of E-HowNet parsing function nodes.

Subclasses:

• EhnParseRestriction. Can be an anchor.

property value

Must be an Entity.

Root

class EhnParseRootBase

The base class of E-HowNet parsing root nodes. Works similar to entities but is not an entity. Used only in feature-based expressions.

Subclasses:

• EhnParseRoot.

property features

A list of Features.

Partial Nodes

Function Head

class EhnParseFunctionHead

The base class of nodes with a function as its head.

Note that the attribute obj.head of this object obj returns obj.function.head.

Subclasses:

• EhnParseFunctionEntity

• EhnParseFunctionFeature

property function

Must be a Function.

Anchor Body

class EhnParseAnchorBody

The base class of anchor nodes.

Subclasses:

• EhnParseNormalEntity

• EhnParseFunctionEntity

• EhnParseRestriction

property anchor

The Anchor.

Anchor

class EhnParseAnchor

The coindex target.

head: str

The coindex of this anchor.