calc

package module

v0.0.0-...-8d43dbe Latest Latest Go to latest Published: Jul 20, 2020 License: MIT Imports: 8 Imported by: 0

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README ¶

calc

Calc is a package that provides the tools to evaluate simple numerical expressions

Documentation ¶

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func ContainsLetter ¶

func ContainsLetter(s string) bool

ContainsLetter checks if a string contains a letter

func IsOperator ¶

func IsOperator(r rune) bool

func IsWhitespace ¶

func IsWhitespace(ch rune) bool

func Solve ¶

func Solve(s string) float64

func SolveFunction ¶

func SolveFunction(s string) string

SolveFunction returns the answer of a function found within an expression

func SolvePostfix ¶

func SolvePostfix(tokens Stack) float64

SolvePostfix evaluates and returns the answer of the expression converted to postfix

Types ¶

type Parser ¶

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

func NewParser ¶

func NewParser(r io.Reader) *Parser

func (*Parser) Parse ¶

func (p *Parser) Parse() (Stack, error)

func (*Parser) Scan ¶

func (p *Parser) Scan() (tok Token)

func (*Parser) ScanIgnoreWhitespace ¶

func (p *Parser) ScanIgnoreWhitespace() (tok Token)

func (*Parser) Unscan ¶

func (p *Parser) Unscan()

type Scanner ¶

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

func NewScanner ¶

func NewScanner(r io.Reader) *Scanner

func (*Scanner) Read ¶

func (s *Scanner) Read() rune

func (*Scanner) Scan ¶

func (s *Scanner) Scan() Token

func (*Scanner) ScanNumber ¶

func (s *Scanner) ScanNumber() Token

func (*Scanner) ScanWhitespace ¶

func (s *Scanner) ScanWhitespace() Token

func (*Scanner) ScanWord ¶

func (s *Scanner) ScanWord() Token

func (*Scanner) Unread ¶

func (s *Scanner) Unread()

type Stack ¶

type Stack struct {
	Values []Token
}

Stack is a LIFO data structure

func ShuntingYard ¶

func ShuntingYard(s Stack) Stack

func (*Stack) EmptyInto ¶

func (self *Stack) EmptyInto(s *Stack)

EmptyInto dumps all tokens from one stack to another

func (*Stack) IsEmpty ¶

func (self *Stack) IsEmpty() bool

IsEmpty checks if there are any tokens in the stack

func (*Stack) Length ¶

func (self *Stack) Length() int

Length returns the amount of tokens in the stack

func (*Stack) Peek ¶

func (self *Stack) Peek() Token

Peek returns the token at the top of the stack

func (*Stack) Pop ¶

func (self *Stack) Pop() Token

Pop removes the token at the top of the stack and returns its value

func (*Stack) Push ¶

func (self *Stack) Push(i ...Token)

Push adds tokens to the top of the stack

type Token ¶

type Token struct {
	Type  TokenType
	Value string
}

type TokenType ¶

type TokenType int

const (
	NUMBER TokenType = iota
	LPAREN
	RPAREN
	CONSTANT
	FUNCTION
	OPERATOR
	WHITESPACE
	ERROR
	EOF
)

Source Files ¶

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