evaluator

package

v1.25.4 Latest Latest Go to latest Published: Feb 13, 2024 License: Apache-2.0 Imports: 4 Imported by: 1

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Repository

github.com/RedHatInsights/insights-operator-utils

Links

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Documentation ¶

Overview ¶

Package evaluator contains expression evaluator with the ability to provide named values into expressions. Evaluator supports all arithmetic operators, logical operators, arithmetic operators, and it is possible to use parenthesis to change priority of operations.

Index ¶

func Evaluate(expression string, values map[string]int) (int, error)
type Operator
type Stack
type TokenWithValue

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Evaluate ¶

func Evaluate(expression string, values map[string]int) (int, error)

Evaluate function evaluates given algebraic expression and return its result

Types ¶

type Operator ¶

type Operator func(int, int) int

Operator type for all functions that implements any dyadic operator

type Stack ¶

type Stack struct {
	// contains filtered or unexported fields
}

Stack struct is naive but fully functional implementation of operand stack

func (*Stack) Empty ¶

func (stack *Stack) Empty() bool

Empty method checks if the stack is empty

func (*Stack) Pop ¶

func (stack *Stack) Pop() (int, error)

Pop method pops value from stack with check if stack is empty

func (*Stack) Push ¶

func (stack *Stack) Push(value int)

Push method pushes value onto the stack

func (*Stack) Size ¶

func (stack *Stack) Size() int

Size method returns number of items on stack

type TokenWithValue ¶

type TokenWithValue struct {
	Token      token.Token
	Value      int
	Identifier string
}

TokenWithValue structure represents token tied with its value (if any)

func IdentifierToken ¶

func IdentifierToken(tok token.Token, identifier string) TokenWithValue

IdentifierToken is constructor for TokenWithValue structure

func OperatorToken ¶

func OperatorToken(tok token.Token) TokenWithValue

OperatorToken is constructor for TokenWithValue structure

func ValueToken ¶

func ValueToken(tok token.Token, value int) TokenWithValue

ValueToken is constructor for TokenWithValue structure

Source Files ¶

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