ASTNode: A Node in an Abstract Syntax Tree (AST)

In tangram: The Grammar of Tables

A Node in an Abstract Syntax Tree (AST)

Description

A Node in an Abstract Syntax Tree (AST)

A Node in an Abstract Syntax Tree (AST)

Details

This is the root R6 class of any term of the AST which is created when parsing a table formula. This should only be used as a base class as the class information carries the semantic meaning of a given node.

Public fields

format

Any formatting directive passed to this node.

value

A string of addtional information contained by the node.

Methods

Public methods

• ASTNode$terms()

• ASTNode$distribute()

• ASTNode$string()

• ASTNode$reduce()

• ASTNode$set_format()

• ASTNode$clone()

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Method terms()

Returns this node

Usage

ASTNode$terms()

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Method distribute()

Distributes data across multiplications and rearranges nodes

Usage

ASTNode$distribute()

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Method string()

Returns string representation of node

Usage

ASTNode$string()

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Method reduce()

Given a set of data, associates it with AST nodes

Usage

ASTNode$reduce(data)

Arguments

data

(data.frame) data to associate across nodes

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Method set_format()

Override the formatting directive for this node

Usage

ASTNode$set_format(x)

Arguments

x

(numeric,character) the formatting directive

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Method clone()

The objects of this class are cloneable with this method.

Usage

ASTNode$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

tangram documentation built on Feb. 16, 2023, 5:59 p.m.