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@amundo
Last active July 3, 2020 14:29
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a simple parser for simple eaf files
/*
ANNOTATION_DOCUMENT - top level
HEADER - unique top-level node containing references to media, and arbitrary name/value PROPERTY pairs
MEDIA_DESCRIPTOR - links to media files
PROPERTY - generic key-value element. wt actual f.
TIME_ORDER - array of TIME_SLOTs
TIME_SLOT - a single point in the timeline
TIER - array of ANNOTATIONs
ALIGNABLE_ANNOTATION - ANNOTATION with TIME_SLOT_REF1 and 2
REF_ANNOTATION - time references are taken from a linked ALIGNABLE_ANNOTATION referenced in ANNOTATION_REF
ANNOTATION - container for either ALIGNABLE_ANNOTATION or REF_ANNOTATION
ANNOTATION_VALUE - the content under ANNOTATION (ALIGNABLE|REF)_ANNOTATION
CONSTRAINT - metadata which describes the four “stereotypes”. useless.
LINGUISTIC_TYPE - should be called TIER_TYPE ; describes constraints and attributes for a TIER. useless.
*/
let buildTimeSlotIndex = eaf => [...eaf.querySelectorAll('TIME_SLOT')]
.reduce((index, timeSlot) => {
index[timeSlot.getAttribute('TIME_SLOT_ID')] = parseInt(timeSlot.getAttribute('TIME_VALUE'))
return index
}, {})
let extractMediaReference = eaf => {
/*
<MEDIA_DESCRIPTOR
MEDIA_URL="file:///C:/Users/Carmen/Desktop/New folder (2)/SMD-1026-CHM- espiritus silvestre..WAV"
MIME_TYPE="audio/x-wav"
RELATIVE_MEDIA_URL="./SMD-1026-CHM- espiritus silvestre..WAV"/>
*/
return {
fileName: eaf.querySelector("MEDIA_DESCRIPTOR").getAttribute('RELATIVE_MEDIA_URL'),
mimeType: eaf.querySelector("MEDIA_DESCRIPTOR").getAttribute('MIME_TYPE')
}
}
let resolveTimeslots = (timeSlotIndex, annotation) => ({
start: timeSlotIndex[annotation.getAttribute('TIME_SLOT_REF1')] / 1000,
end: timeSlotIndex[annotation.getAttribute('TIME_SLOT_REF2')]/ 1000
})
let parseRefAnnotation = (annotation, tierID) => ({
id: annotation.getAttribute('ANNOTATION_REF'),
[tierID]: annotation.querySelector('ANNOTATION_VALUE').textContent
})
let parseAlignableAnnotation = (annotation, tierID, timeSlotIndex) => ({
id: annotation.getAttribute('ANNOTATION_ID'),
[tierID]: annotation.querySelector('ANNOTATION_VALUE').textContent,
start: resolveTimeslots(timeSlotIndex, annotation).start,
end: resolveTimeslots(timeSlotIndex, annotation).end
})
let parseEAF = eaf => {
let timeSlotIndex = buildTimeSlotIndex(eaf)
let sentencesById = Array.from(eaf.querySelectorAll('TIER')).reduce((sentencesById, tier) => {
let tierID = tier.getAttribute("TIER_ID")
tier.querySelectorAll('ALIGNABLE_ANNOTATION').forEach(alignableAnnotation => {
let sentence = parseAlignableAnnotation(alignableAnnotation, tierID, timeSlotIndex)
sentencesById[sentence.id] = sentence
})
tier.querySelectorAll('REF_ANNOTATION').forEach(refAnnotation => {
let translation = parseRefAnnotation(refAnnotation, tierID)
console.log(translation)
sentencesById[translation.id] = Object.assign(sentencesById[translation.id], translation)
})
return sentencesById
}, {})
let sentences = Object.values(sentencesById)
.sort((a,b) => a.start > b.start)
// .forEach(sentence => delete sentence.id) // just an internal elan id, right?
let metadata = {
media: extractMediaReference(eaf)
}
return {metadata, sentences}
}
let sameTimestamp = (a,b) => a.start == b.start && a.end == b.end
// let areAligned = (tierA, tierB) => tierA.
// let eaf = new DOMParser().parseFromString(document.firstElementChild.outerHTML, 'application/xml')
// console.table(parseEAF(eaf))
export {parseEAF}
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