overleaf/services/clsi/test/unit/js/pdfjsTests.js

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const fs = require('fs')
const Path = require('path')
const { expect } = require('chai')
const { parseXrefTable } = require('../../../app/js/XrefParser')
const { NoXrefTableError } = require('../../../app/js/Errors')
const PATH_EXAMPLES = 'test/acceptance/fixtures/examples/'
const PATH_SNAPSHOTS = 'test/unit/js/snapshots/pdfjs/'
const EXAMPLES = fs.readdirSync(PATH_EXAMPLES)
function snapshotPath(example) {
return Path.join(PATH_SNAPSHOTS, example, 'XrefTable.json')
}
function pdfPath(example) {
return Path.join(PATH_EXAMPLES, example, 'output.pdf')
}
async function loadContext(example) {
const size = (await fs.promises.stat(pdfPath(example))).size
let blob
try {
blob = await fs.promises.readFile(snapshotPath(example))
} catch (e) {
if (e.code !== 'ENOENT') {
throw e
}
}
const snapshot = blob ? JSON.parse(blob) : null
return {
size,
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snapshot,
}
}
async function backFillSnapshot(example, size) {
const table = await parseXrefTable(pdfPath(example), size, () => {})
await fs.promises.mkdir(Path.dirname(snapshotPath(example)), {
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recursive: true,
})
await fs.promises.writeFile(
snapshotPath(example),
JSON.stringify(table, null, 2)
)
return table
}
describe('pdfjs', function () {
describe('when the pdf is an empty file', function () {
it('should yield no entries', async function () {
const path = 'does/not/matter.pdf'
let table
try {
table = await parseXrefTable(path, 0)
} catch (e) {
expect(e).to.be.an.instanceof(NoXrefTableError)
}
expect(table).to.not.exist
})
})
for (const example of EXAMPLES) {
describe(example, function () {
let size, snapshot
before('load snapshot', async function () {
const ctx = await loadContext(example)
size = ctx.size
snapshot = ctx.snapshot
})
before('back fill new snapshot', async function () {
if (snapshot === null) {
console.error('back filling snapshot for', example)
snapshot = await backFillSnapshot(example, size)
}
})
it('should produce the expected xRef table', async function () {
const table = await parseXrefTable(pdfPath(example), size, () => {})
// compare the essential parts of the xref table only
expect(table.xRefEntries[0]).to.include({ offset: 0 })
expect(table.xRefEntries.slice(1)).to.deep.equal(
snapshot.xRefEntries
.slice(1)
.filter(xref => xref.uncompressed) // we only use the uncompressed fields
.map(xref => {
return { offset: xref.offset, uncompressed: xref.uncompressed } // ignore unused gen field
})
)
})
})
}
})