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const { lex } = require('../src/lexer.js')
describe('lex', () => {
it('lexes the empty string', () => {
expect(lex('')).toEqual([])
})
it('throws on unexpected input', () => {
expect(() => { lex('q') }).toThrow(/Syntax error/)
})
it('throws on unexpected input at the end', () => {
expect(() => { lex('1d6 `') }).toThrow(/Syntax error/)
})
it('throws on unexpected input in the middle', () => {
expect(() => { lex('2d3 + b 3d4') }).toThrow(/Syntax error/)
})
describe('ignores whitespace', () => {
it('2 d 4', () => {
expect(lex('2 d 4')).not.toBe('error')
})
it(' 1d8', () => {
expect(lex(' 1d8')).not.toBe('error')
})
it('3d4 ', () => {
expect(lex('3d4 ')).not.toBe('error')
})
})
describe('lexes basic dice', () => {
it('1d6', () => {
expect(lex('1d6')).toEqual([
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 6 }
])
})
it('42d172', () => {
expect(lex('42d172')).toEqual([
{ type: 'constant', value: 42 },
{ type: 'd' },
{ type: 'constant', value: 172 }
])
})
})
describe('lexes addition', () => {
it('1d6 + 1d4', () => {
expect(lex('1d6 + 1d4')).toEqual([
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 6 },
{ type: '+' },
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 4 }
])
})
it('2d17 + 4', () => {
expect(lex('2d17 + 4')).toEqual([
{ type: 'constant', value: 2 },
{ type: 'd' },
{ type: 'constant', value: 17 },
{ type: '+' },
{ type: 'constant', value: 4 }
])
})
})
describe('lexes subtraction', () => {
it('1d6 - 1d4', () => {
expect(lex('1d6 - 1d4')).toEqual([
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 6 },
{ type: '-' },
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 4 }
])
})
it('2d17 - 4', () => {
expect(lex('2d17 - 4')).toEqual([
{ type: 'constant', value: 2 },
{ type: 'd' },
{ type: 'constant', value: 17 },
{ type: '-' },
{ type: 'constant', value: 4 }
])
})
})
describe('lexes parentheses', () => {
it('(1d6)d6', () => {
expect(lex('(1d6)d6')).toEqual([
{ type: '(' },
{ type: 'constant', value: 1 },
{ type: 'd' },
{ type: 'constant', value: 6 },
{ type: ')' },
{ type: 'd' },
{ type: 'constant', value: 6 }
])
})
it('2d(6+3)d4', () => {
expect(lex('2d(6+3)d4')).toEqual([
{ type: 'constant', value: 2 },
{ type: 'd' },
{ type: '(' },
{ type: 'constant', value: 6 },
{ type: '+' },
{ type: 'constant', value: 3 },
{ type: ')' },
{ type: 'd' },
{ type: 'constant', value: 4 }
])
})
})
})
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