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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import { ArcCollection } from '../paths/mapshaper-arcs'; | ||
| import { DataTable } from '../datatable/mapshaper-data-table'; | ||
|
|
||
| export function exportBSON(datasets, opts) { | ||
| var { serialize } = require('bson'); | ||
| var obj = exportDatasets(datasets); | ||
| var content = serialize(obj); | ||
| return [{ | ||
| content: content, | ||
| filename: opts.file || 'output.mshp' | ||
| }]; | ||
| } | ||
|
|
||
| // gui: (optional) gui instance | ||
| // | ||
| export function exportDatasets(datasets) { | ||
| // TODO: add targets | ||
| // TODO: add gui state | ||
| return { | ||
| version: 1, | ||
| datasets: datasets.map(exportDataset) | ||
| }; | ||
| } | ||
|
|
||
| // TODO.. | ||
| // export function serializeSession(catalog) { | ||
| // var obj = exportDatasets(catalog.getDatasets()); | ||
| // return BSON.serialize(obj); | ||
| // } | ||
|
|
||
| export function exportDataset(dataset) { | ||
| return Object.assign(dataset, { | ||
| arcs: dataset.arcs ? exportArcs(dataset.arcs) : null, | ||
| info: dataset.info ? exportInfo(dataset.info) : null, | ||
| layers: (dataset.layers || []).map(exportLayer) | ||
| }); | ||
| } | ||
|
|
||
| function typedArrayToBuffer(arr) { | ||
| return new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength); | ||
| } | ||
|
|
||
| function exportArcs(arcs) { | ||
| var data = arcs.getVertexData(); | ||
| var obj = { | ||
| nn: typedArrayToBuffer(data.nn), | ||
| xx: typedArrayToBuffer(data.xx), | ||
| yy: typedArrayToBuffer(data.yy) | ||
| }; | ||
| return obj; | ||
| } | ||
|
|
||
| function exportLayer(lyr) { | ||
| return { | ||
| name: lyr.name || null, | ||
| geometry_type: lyr.geometry_type || null, | ||
| shapes: lyr.shapes || null, | ||
| data: lyr.data ? lyr.data.getRecords() : null | ||
| }; | ||
| } | ||
|
|
||
| function exportInfo(info) { | ||
| // TODO: export CRS | ||
| return info; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| import { ArcCollection } from '../paths/mapshaper-arcs'; | ||
| import { DataTable } from '../datatable/mapshaper-data-table'; | ||
| import { stop } from '../utils/mapshaper-logging'; | ||
| import { BinArray } from '../utils/mapshaper-binarray'; | ||
|
|
||
| // Import datasets contained in a BSON blob | ||
| // Return command target as a dataset | ||
| // | ||
| export function importBSON(buf) { | ||
| var { deserialize } = require('bson'); | ||
| var obj = deserialize(buf, { | ||
| promoteBuffers: true, | ||
| promoteValues: true | ||
| }); | ||
| if (!isValidSession(obj)) { | ||
| stop('Invalid mapshaper session data object'); | ||
| } | ||
|
|
||
| var datasets = obj.datasets.map(importDataset); | ||
| var target = datasets[0]; // TODO: improve | ||
| return { | ||
| datasets: datasets, | ||
| target: target | ||
| }; | ||
| } | ||
|
|
||
| function isValidSession(obj) { | ||
| if (!Array.isArray(obj.datasets)) { | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| function importDataset(obj) { | ||
| return { | ||
| info: obj.info, | ||
| layers: (obj.layers || []).map(importLayer), | ||
| arcs: obj.arcs ? importArcs(obj.arcs) : null | ||
| }; | ||
| } | ||
|
|
||
| function bufferToDataView(buf, constructor) { | ||
| return new constructor(BinArray.copyToArrayBuffer(buf)); | ||
| // this doesn't work: "RangeError: start offset of Float64Array should be a multiple of 8" | ||
| // return new constructor(buf.buffer, buf.byteOffset, buf.byteLength); | ||
| } | ||
|
|
||
| function importArcs(obj) { | ||
| var nn = bufferToDataView(obj.nn, Uint32Array); | ||
| var xx = bufferToDataView(obj.xx, Float64Array); | ||
| var yy = bufferToDataView(obj.yy, Float64Array); | ||
| var arcs = new ArcCollection(nn, xx, yy); | ||
| return arcs; | ||
| } | ||
|
|
||
| function importLayer(lyr) { | ||
| return Object.assign(lyr, { | ||
| data: lyr.data ? new DataTable(lyr.data) : null | ||
| }); | ||
| } |
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