Climb.Grades

Climbing grades representation and conversion

Reference

Conversions are based in two tables

Types

type alias System t =

{ fromLinearScale : Float -> t

, toLinearScale : t -> Float

, show : t -> String

, parse : String -> Maybe t

, simplify : t -> t

, zero : t

, next : t -> t

, order : t -> t -> Order

}

Collect methods for a GradeT pseudo-typeclass

type alias VGrade =

Grade

American V-grades system

type alias Font =

Grade

Fontainebleau system

type alias Fr =

Grade

French system for grading routes

type alias Us =

Grade

American Decimal system for grading routes

type alias Br =

Grade

French system for grading routes

Grading systems

Required as the first argument of may functions in order to specify the desired grading system.

vgrade : System VGrade

The Hueco/Vermin system used for bouldering in the USA, .i.e., the v-grades.

font : System Font

French Fontainbleau system for bouldering.

fr : System Fr

The French system.

us : System Us

The Yosemite Decimal System used in the USA.

br : System Br

The Brazillian system.

Converting to strings

showGrade : System a -> a -> String

Render grade as a string

toAnyGrade : System dest -> System a -> Bool -> a -> String

Render Bouldering grade in destT format.

The boolean argument tells if the final grade should be simplified or not in the final rendering.

toFont : System a -> Bool -> a -> String

Alias to toGrade font

toVGrade : System a -> Bool -> a -> String

Alias to toGrade vv

Parsing and converting

parseGrade : System a -> String -> Maybe a

Parse string representing grade

parseGrade vv "V10/11" ==> Just (Grade 10 HalfwayNext)

parseGrade_ : System a -> String -> a

Parse string representing grade.

If parsing fails, return the default base/zero grade. This should never be used to handle user input.

parse_ vv "V10/11" ==> Grade 10 HalfwayNext

fromAnyGrade : System src -> System a -> String -> Maybe a

Try to read string in the src format.

fromVGrade : System a -> String -> Maybe a

Alias to fromGrade vv

fromFont : System a -> String -> Maybe a

Alias to fromGrade font

toLinearScale : System a -> a -> Float

Convert to the floating point universal scale

This is useful to convert to different grading systems or saving in a database.

font =
    grade
        |> Font.toLinearScale
        |> Hueco.fromLinearScale

fromLinearScale : System a -> Float -> a

Convert from the floating point universal scale

For bouldering, the floating point scale is based in the American Hueco/Vermin system. i.e. fromLinearScale 10.0 refers to V10, which is 7c+ in Fontainbleau scale.

Transforming grades

simplifyGrade : System a -> a -> a

Remove modifiers from grade

parseGrade_ vv "V10+"
    |> simplify vv
    ==> Grade 10 Base

nextGrade : System a -> a -> a

Next full grade ignoring modifiers

Special methods

zeroGrade : System a -> a

The lowest grade in the scale

Different scales may start from different levels

compareGrades : System a -> a -> a -> Order

Compare two grades

This can be used in sorting algorithms like List.sortWith

Modules

Climb.Grades

croq-app/elm-climb/2.0.0

Climb.Grades

Reference

Types

Grading systems

Converting to strings

Parsing and converting

Transforming grades

Special methods

Modules