Add IRCRA grading scale

[Stevie-Ray]

Add IRCRA grading scale support (fixes #179)

Adds support for the IRCRA integer scale from Reporting Grades in Climbing Research.
This lets Sandbag convert between systems (French, YDS, Font, V-scale, etc.) using a shared universal scale, super useful for research and data comparisons. Includes mappings and tests.

[github-actions]

Coverage report

Caution

Coverage does not meet threshold
Statements coverage not met for global: expected <=999999 not covered statements, but got 649

St.❔	Category	Percentage	Covered / Total
🟢	Statements	88.18% (+0.68% 🔼)	649/736
🟡	Branches	69.15% (+1.61% 🔼)	139/201
🟢	Functions	80.38% (+0.51% 🔼)	127/158
🟢	Lines	87.41% (+0.72% 🔼)	597/683

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	scales/ircra.ts	100%	100%	100%	100%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	index.ts	100%	100%	35% (-1.84% 🔻)	100%

Test suite run success

294 tests passing in 18 suites.

Report generated by 🧪jest coverage report action from f31bff4

[musoke]

Thank you for this!
Very interesting. Is the table on https://ircra.rocks/reporting-grades-in-climbing-research/ consistent with ours? I am concerned that our current table doesn't align completely with the IRCRA table, so may give unexpected results.

[Stevie-Ray]

Hi @musoke, i used the GradeParser.ts in __tests__ to match the internal grading system. Is the sandbag 107 grades based on some other sheet or system?

    test('convert IRCRA to FONT', () => {
      expect(convertGrade('14', GradeScales.IRCRA, GradeScales.FONT)).toEqual('5b+/5c')
    })

    test('convert IRCRA to VSCALE', () => {
      expect(convertGrade('14', GradeScales.IRCRA, GradeScales.VSCALE)).toEqual('V2')
    })

    test('convert IRCRA to YDS', () => {
      expect(convertGrade('15', GradeScales.IRCRA, GradeScales.YDS)).toEqual('5.10a')
    })

    test('convert IRCRA to French', () => {
      expect(convertGrade('15', GradeScales.IRCRA, GradeScales.FRENCH)).toEqual('5c+/6a')
    })

    // Test reverse conversions
    test('convert FONT to IRCRA', () => {
      expect(convertGrade('6a', GradeScales.FONT, GradeScales.IRCRA)).toEqual('15/16')
    })

    test('convert VSCALE to IRCRA', () => {
      expect(convertGrade('V2', GradeScales.VSCALE, GradeScales.IRCRA)).toEqual('13/14')
    })

It was kind of tricky to make it match perfectly, but as you can see in the image, there is no perfect alignment.