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const { parse } = require('../src/parser.js')
describe('parse', () => {
describe('error handling', () => {
it('throws when a binary operation lacks an argument', () => {
expect(() => { parse('1d') }).toThrow(/Syntax error/)
expect(() => { parse('2+3+') }).toThrow(/Syntax error/)
})
it('throws when two binary operations follow each other', () => {
expect(() => { parse('1++2') }).toThrow(/Syntax error/)
})
it('throws when two dice not combined with a binary operation', () => {
expect(() => { parse('(1d4)(1d6)') }).toThrow(/Syntax error/)
expect(() => { parse('1 2') }).toThrow(/Syntax error/)
})
})
it('parses a constant', () => {
expect(parse('5')).toEqual({ type: 'constant', value: 5 })
})
it('parses a simple die with no left side', () => {
expect(parse('d6')).toEqual({
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
})
})
it('parses a simple die (1d6)', () => {
expect(parse('1d6')).toEqual({
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
})
})
it('parses a simple die (10d42)', () => {
expect(parse('10d42')).toEqual({
type: 'd',
left: { type: 'constant', value: 10 },
right: { type: 'constant', value: 42 }
})
})
it('parses a compound die (1d2d3)', () => {
expect(parse('1d2d3')).toEqual({
type: 'd',
left: { type: 'constant', value: 1 },
right: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 3 }
}
})
})
it('parses constant addition', () => {
expect(parse('1 + 2')).toEqual({
type: 'add',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 2 }
})
})
it('parses dice addition', () => {
expect(parse('2d8 + d6')).toEqual({
type: 'add',
left: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 8 }
},
right: {
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
}
})
})
it('parses dice subtraction', () => {
expect(parse('1d6 - 2d8')).toEqual({
type: 'subtract',
left: {
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
},
right: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 8 }
}
})
})
it('parses negatives', () => {
expect(parse('-1 + (-(2d6))')).toEqual({
type: 'add',
left: {
type: 'negative',
value: { type: 'constant', value: 1 }
},
right: {
type: 'negative',
value: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 6 }
}
}
})
})
it('parses exploding dice', () => {
expect(parse('1E1d6')).toEqual({
type: 'E',
left: { type: 'constant', value: 1 },
right: {
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
}
})
})
it('parses dice with keep high', () => {
expect(parse('1K2d20')).toEqual({
type: 'K',
left: { type: 'constant', value: 1 },
right: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 20 }
}
})
})
it('parses dice with keep low', () => {
expect(parse('1k2d20')).toEqual({
type: 'k',
left: { type: 'constant', value: 1 },
right: {
type: 'd',
left: { type: 'constant', value: 2 },
right: { type: 'constant', value: 20 }
}
})
})
it('parses additive bonuses', () => {
expect(parse('3d4+1')).toEqual({
type: 'bonusAdd',
left: {
type: 'd',
left: { type: 'constant', value: 3 },
right: { type: 'constant', value: 4 }
},
right: { type: 'constant', value: 1 }
})
})
it('parses negative bonuses', () => {
expect(parse('3d4-1')).toEqual({
type: 'bonusSubtract',
left: {
type: 'd',
left: { type: 'constant', value: 3 },
right: { type: 'constant', value: 4 }
},
right: { type: 'constant', value: 1 }
})
})
describe('parsing parentheses', () => {
test('(1d6)d6', () => {
expect(parse('(1d6)d6')).toEqual({
type: 'd',
left: {
type: 'd',
left: { type: 'constant', value: 1 },
right: { type: 'constant', value: 6 }
},
right: { type: 'constant', value: 6 },
})
})
test('2d(6 + 3)d4', () => {
expect(parse('2d(6 + 3)d4')).toEqual({
type: 'd',
left: { type: 'constant', value: 2 },
right: {
type: 'd',
left: {
type: 'add',
left: { type: 'constant', value: 6 },
right: { type: 'constant', value: 3 }
},
right: { type: 'constant', value: 4 }
},
})
})
})
})
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