JavaScript Programming assignment

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scan.mjs
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import { scan CellRef } from '../src/expr-parser.mjs';
import chai from 'chai';
const { assert } = chai;
describe('scan' function() {
it ('an integer should scan correctly' function () {
const tokens = scan(' 123 ');
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'num');
assert.equal(tokens[0].lexeme '123');
assert.equal(tokens[0].value 123);
});
it ('a number with decimal point should scan correctly' function () {
const tokens = scan(' 1.23 ');
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'num');
assert.equal(tokens[0].lexeme '1.23');
assert.equal(tokens[0].value 1.23);
});
it ('a number with exponent should scan correctly' function () {
const tokens = scan(' 1.23e2 ');
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'num');
assert.equal(tokens[0].lexeme '1.23e2');
assert.equal(tokens[0].value 123);
});
it ('a number with negative exponent should scan correctly' function () {
const tokens = scan(' 123e-2 ');
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'num');
assert.equal(tokens[0].lexeme '123e-2');
assert.equal(tokens[0].value 1.23);
});
it ('a rel/rel ref should scan correctly' function () {
const tokens = scan(' b4 ');
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'ref');
assert.equal(tokens[0].lexeme 'b4');
assert.deepEqual(tokens[0].value {
col: { isAbs: false index: 1 }
row: { isAbs: false index: 3 }
});
});
it ('a rel/rel ref relative to a base should scan correctly' function () {
const tokens = scan(' C5 ' new CellRef('e9'));
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'ref');
assert.equal(tokens[0].lexeme 'C5');
assert.deepEqual(tokens[0].value {
col: { isAbs: false index: -2 }
row: { isAbs: false index: -4 }
});
});
it ('a rel/abs ref relative to a base should scan correctly' function () {
const tokens = scan(' c$5 ' new CellRef('E9'));
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'ref');
assert.equal(tokens[0].lexeme 'c$5');
assert.deepEqual(tokens[0].value {
col: { isAbs: false index: -2 }
row: { isAbs: true index: 4 }
});
});
it ('an abs/abs ref relative to a base should scan correctly' function () {
const tokens = scan(' $c$5 ' new CellRef('c4'));
assert.equal(tokens.length 2);
assert.equal(tokens[0].type 'ref');
assert.equal(tokens[0].lexeme '$c$5');
assert.deepEqual(tokens[0].value {
col: { isAbs: true index: 2 }
row: { isAbs: true index: 4 }
});
});
it ('multiple tokens should scan correctly' function () {
const tokens = scan('123e-2 + ( $A2 * c3 )' new CellRef('C4'));
assert.equal(tokens.length 8);
assert.deepEqual(tokens.map(t => t.type)
[ 'num' '+' '(' 'ref' '*' 'ref' ')' '<EOF>' ]);
assert.equal(tokens[0].value 1.23);
assert.deepEqual(tokens[3].value
{ col: { isAbs: true index: 0 }
row: { isAbs: false index: -2 }
});
assert.deepEqual(tokens[5].value
{ col: { isAbs: false index: 0 }
row: { isAbs: false index: -1 }
});
});
});