Binary expression class

Class representing a binary operation in an expression

Super class

scidb::scidb.expression -> scidb.expression.binary

Methods

Public methods

• scidb.expression.binary$new()

• scidb.expression.binary$type()

• scidb.expression.binary$operation()

• scidb.expression.binary$left()

• scidb.expression.binary$right()

• scidb.expression.binary$symbols()

• scidb.expression.binary$unary()

• scidb.expression.binary$unary_composite()

• scidb.expression.binary$substitute()

• scidb.expression.binary$to_r()

• scidb.expression.binary$to_afl()

• scidb.expression.binary$clone()

---

Method new()

Usage

scidb.expression.binary$new(op, left, right)

Arguments

op

compound type (e.g., but not limited to, "&&" and "||")

left

left predicate

right

right predicate

---

Method type()

Returns the type of the expression as a string

Usage

scidb.expression.binary$type()

Returns

"BINARY"

---

Method operation()

Returns the binary operation name

Usage

scidb.expression.binary$operation()

Returns

binary op name (length-1 character)

---

Method left()

Usage

scidb.expression.binary$left()

Returns

if type "&&", "||", or "!", left predicate; else NULL

---

Method right()

Usage

scidb.expression.binary$right()

Returns

if type "&&" or "||", right predicate; else NULL

---

Method symbols()

Returns the distinct symbols used in the expression

Usage

scidb.expression.binary$symbols()

Returns

vector of symbol names

---

Method unary()

Whether or not the expression is a function of (at most) a single symbol

Usage

scidb.expression.binary$unary()

Returns

a boolean value indicating unary or non-unary

---

Method unary_composite()

Whether or not the expression is unary or a boolean AND or OR of two other in-turn unary composite expressions

Usage

scidb.expression.binary$unary_composite()

Returns

a boolean value indicating unary-composite or not

---

Method substitute()

Renames the symbols in the expression according to replacements in the arguments

Usage

scidb.expression.binary$substitute(...)

Arguments

...

optional list of string replacements for each symbol in the expression

---

Method to_r()

Convert the expression to an R string, with optional symbol substitutions

Usage

scidb.expression.binary$to_r(...)

Arguments

...

optional list of string replacements for each symbol in the expression

Returns

evaluation of this predicate as a single R string

---

Method to_afl()

Convert the expression to an AFL string, with optional symbol substitutions

Usage

scidb.expression.binary$to_afl(...)

Arguments

...

optional list of string replacements for each symbol in the expression

Returns

evaluation of this predicate as a single AFL string

---

Method clone()

The objects of this class are cloneable with this method.

Usage

scidb.expression.binary$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.