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- // https://github.com/mbostock/shapefile Version 0.6.6. Copyright 2017 Mike Bostock.
- (function (global, factory) {
- typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
- typeof define === 'function' && define.amd ? define(['exports'], factory) :
- (factory((global.shapefile = {})));
- }(this, (function (exports) { 'use strict';
- var array_cancel = function() {
- this._array = null;
- return Promise.resolve();
- };
- var array_read = function() {
- var array = this._array;
- this._array = null;
- return Promise.resolve(array ? {done: false, value: array} : {done: true, value: undefined});
- };
- function array(array) {
- return new ArraySource(array instanceof Uint8Array ? array : new Uint8Array(array));
- }
- function ArraySource(array) {
- this._array = array;
- }
- ArraySource.prototype.read = array_read;
- ArraySource.prototype.cancel = array_cancel;
- var fetchPath = function(url) {
- return fetch(url).then(function(response) {
- return response.body && response.body.getReader
- ? response.body.getReader()
- : response.arrayBuffer().then(array);
- });
- };
- var requestPath = function(url) {
- return new Promise(function(resolve, reject) {
- var request = new XMLHttpRequest;
- request.responseType = "arraybuffer";
- request.onload = function() { resolve(array(request.response)); };
- request.onerror = reject;
- request.ontimeout = reject;
- request.open("GET", url, true);
- request.send();
- });
- };
- function path(path) {
- return (typeof fetch === "function" ? fetchPath : requestPath)(path);
- }
- function stream(source) {
- return typeof source.read === "function" ? source : source.getReader();
- }
- var empty = new Uint8Array(0);
- var slice_cancel = function() {
- return this._source.cancel();
- };
- function concat(a, b) {
- if (!a.length) return b;
- if (!b.length) return a;
- var c = new Uint8Array(a.length + b.length);
- c.set(a);
- c.set(b, a.length);
- return c;
- }
- var slice_read = function() {
- var that = this, array = that._array.subarray(that._index);
- return that._source.read().then(function(result) {
- that._array = empty;
- that._index = 0;
- return result.done ? (array.length > 0
- ? {done: false, value: array}
- : {done: true, value: undefined})
- : {done: false, value: concat(array, result.value)};
- });
- };
- var slice_slice = function(length) {
- if ((length |= 0) < 0) throw new Error("invalid length");
- var that = this, index = this._array.length - this._index;
- // If the request fits within the remaining buffer, resolve it immediately.
- if (this._index + length <= this._array.length) {
- return Promise.resolve(this._array.subarray(this._index, this._index += length));
- }
- // Otherwise, read chunks repeatedly until the request is fulfilled.
- var array = new Uint8Array(length);
- array.set(this._array.subarray(this._index));
- return (function read() {
- return that._source.read().then(function(result) {
- // When done, it’s possible the request wasn’t fully fullfilled!
- // If so, the pre-allocated array is too big and needs slicing.
- if (result.done) {
- that._array = empty;
- that._index = 0;
- return index > 0 ? array.subarray(0, index) : null;
- }
- // If this chunk fulfills the request, return the resulting array.
- if (index + result.value.length >= length) {
- that._array = result.value;
- that._index = length - index;
- array.set(result.value.subarray(0, length - index), index);
- return array;
- }
- // Otherwise copy this chunk into the array, then read the next chunk.
- array.set(result.value, index);
- index += result.value.length;
- return read();
- });
- })();
- };
- function slice(source) {
- return typeof source.slice === "function" ? source :
- new SliceSource(typeof source.read === "function" ? source
- : source.getReader());
- }
- function SliceSource(source) {
- this._source = source;
- this._array = empty;
- this._index = 0;
- }
- SliceSource.prototype.read = slice_read;
- SliceSource.prototype.slice = slice_slice;
- SliceSource.prototype.cancel = slice_cancel;
- var dbf_cancel = function() {
- return this._source.cancel();
- };
- var readBoolean = function(value) {
- return /^[nf]$/i.test(value) ? false
- : /^[yt]$/i.test(value) ? true
- : null;
- };
- var readDate = function(value) {
- return new Date(+value.substring(0, 4), value.substring(4, 6) - 1, +value.substring(6, 8));
- };
- var readNumber = function(value) {
- return !(value = value.trim()) || isNaN(value = +value) ? null : value;
- };
- var readString = function(value) {
- return value.trim() || null;
- };
- var types = {
- B: readNumber,
- C: readString,
- D: readDate,
- F: readNumber,
- L: readBoolean,
- M: readNumber,
- N: readNumber
- };
- var dbf_read = function() {
- var that = this, i = 1;
- return that._source.slice(that._recordLength).then(function(value) {
- return value && (value[0] !== 0x1a) ? {done: false, value: that._fields.reduce(function(p, f) {
- p[f.name] = types[f.type](that._decode(value.subarray(i, i += f.length)));
- return p;
- }, {})} : {done: true, value: undefined};
- });
- };
- var view = function(array) {
- return new DataView(array.buffer, array.byteOffset, array.byteLength);
- };
- var dbf = function(source, decoder) {
- source = slice(source);
- return source.slice(32).then(function(array) {
- var head = view(array);
- return source.slice(head.getUint16(8, true) - 32).then(function(array) {
- return new Dbf(source, decoder, head, view(array));
- });
- });
- };
- function Dbf(source, decoder, head, body) {
- this._source = source;
- this._decode = decoder.decode.bind(decoder);
- this._recordLength = head.getUint16(10, true);
- this._fields = [];
- for (var n = 0; body.getUint8(n) !== 0x0d; n += 32) {
- for (var j = 0; j < 11; ++j) if (body.getUint8(n + j) === 0) break;
- this._fields.push({
- name: this._decode(new Uint8Array(body.buffer, body.byteOffset + n, j)),
- type: String.fromCharCode(body.getUint8(n + 11)),
- length: body.getUint8(n + 16)
- });
- }
- }
- var prototype = Dbf.prototype;
- prototype.read = dbf_read;
- prototype.cancel = dbf_cancel;
- function cancel() {
- return this._source.cancel();
- }
- var parseMultiPoint = function(record) {
- var i = 40, j, n = record.getInt32(36, true), coordinates = new Array(n);
- for (j = 0; j < n; ++j, i += 16) coordinates[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
- return {type: "MultiPoint", coordinates: coordinates};
- };
- var parseNull = function() {
- return null;
- };
- var parsePoint = function(record) {
- return {type: "Point", coordinates: [record.getFloat64(4, true), record.getFloat64(12, true)]};
- };
- var parsePolygon = function(record) {
- var i = 44, j, n = record.getInt32(36, true), m = record.getInt32(40, true), parts = new Array(n), points = new Array(m), polygons = [], holes = [];
- for (j = 0; j < n; ++j, i += 4) parts[j] = record.getInt32(i, true);
- for (j = 0; j < m; ++j, i += 16) points[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
- parts.forEach(function(i, j) {
- var ring = points.slice(i, parts[j + 1]);
- if (ringClockwise(ring)) polygons.push([ring]);
- else holes.push(ring);
- });
- holes.forEach(function(hole) {
- polygons.some(function(polygon) {
- if (ringContainsSome(polygon[0], hole)) {
- polygon.push(hole);
- return true;
- }
- }) || polygons.push([hole]);
- });
- return polygons.length === 1
- ? {type: "Polygon", coordinates: polygons[0]}
- : {type: "MultiPolygon", coordinates: polygons};
- };
- function ringClockwise(ring) {
- var n;
- if ((n = ring.length) < 4) return false;
- var i = 0, area = ring[n - 1][1] * ring[0][0] - ring[n - 1][0] * ring[0][1];
- while (++i < n) area += ring[i - 1][1] * ring[i][0] - ring[i - 1][0] * ring[i][1];
- return area >= 0;
- }
- function ringContainsSome(ring, hole) {
- var i = -1, n = hole.length, c;
- while (++i < n) {
- if (c = ringContains(ring, hole[i])) {
- return c > 0;
- }
- }
- return false;
- }
- function ringContains(ring, point) {
- var x = point[0], y = point[1], contains = -1;
- for (var i = 0, n = ring.length, j = n - 1; i < n; j = i++) {
- var pi = ring[i], xi = pi[0], yi = pi[1],
- pj = ring[j], xj = pj[0], yj = pj[1];
- if (segmentContains(pi, pj, point)) {
- return 0;
- }
- if (((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi)) {
- contains = -contains;
- }
- }
- return contains;
- }
- function segmentContains(p0, p1, p2) {
- var x20 = p2[0] - p0[0], y20 = p2[1] - p0[1];
- if (x20 === 0 && y20 === 0) return true;
- var x10 = p1[0] - p0[0], y10 = p1[1] - p0[1];
- if (x10 === 0 && y10 === 0) return false;
- var t = (x20 * x10 + y20 * y10) / (x10 * x10 + y10 * y10);
- return t < 0 || t > 1 ? false : t === 0 || t === 1 ? true : t * x10 === x20 && t * y10 === y20;
- }
- var parsePolyLine = function(record) {
- var i = 44, j, n = record.getInt32(36, true), m = record.getInt32(40, true), parts = new Array(n), points = new Array(m);
- for (j = 0; j < n; ++j, i += 4) parts[j] = record.getInt32(i, true);
- for (j = 0; j < m; ++j, i += 16) points[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
- return n === 1
- ? {type: "LineString", coordinates: points}
- : {type: "MultiLineString", coordinates: parts.map(function(i, j) { return points.slice(i, parts[j + 1]); })};
- };
- var concat$1 = function(a, b) {
- var ab = new Uint8Array(a.length + b.length);
- ab.set(a, 0);
- ab.set(b, a.length);
- return ab;
- };
- var shp_read = function() {
- var that = this;
- ++that._index;
- return that._source.slice(12).then(function(array) {
- if (array == null) return {done: true, value: undefined};
- var header = view(array);
- // If the record starts with an invalid shape type (see #36), scan ahead in
- // four-byte increments to find the next valid record, identified by the
- // expected index, a non-empty content length and a valid shape type.
- function skip() {
- return that._source.slice(4).then(function(chunk) {
- if (chunk == null) return {done: true, value: undefined};
- header = view(array = concat$1(array.slice(4), chunk));
- return header.getInt32(0, false) !== that._index ? skip() : read();
- });
- }
- // All records should have at least four bytes (for the record shape type),
- // so an invalid content length indicates corruption.
- function read() {
- var length = header.getInt32(4, false) * 2 - 4, type = header.getInt32(8, true);
- return length < 0 || (type && type !== that._type) ? skip() : that._source.slice(length).then(function(chunk) {
- return {done: false, value: type ? that._parse(view(concat$1(array.slice(8), chunk))) : null};
- });
- }
- return read();
- });
- };
- var parsers = {
- 0: parseNull,
- 1: parsePoint,
- 3: parsePolyLine,
- 5: parsePolygon,
- 8: parseMultiPoint,
- 11: parsePoint, // PointZ
- 13: parsePolyLine, // PolyLineZ
- 15: parsePolygon, // PolygonZ
- 18: parseMultiPoint, // MultiPointZ
- 21: parsePoint, // PointM
- 23: parsePolyLine, // PolyLineM
- 25: parsePolygon, // PolygonM
- 28: parseMultiPoint // MultiPointM
- };
- var shp = function(source) {
- source = slice(source);
- return source.slice(100).then(function(array) {
- return new Shp(source, view(array));
- });
- };
- function Shp(source, header) {
- var type = header.getInt32(32, true);
- if (!(type in parsers)) throw new Error("unsupported shape type: " + type);
- this._source = source;
- this._type = type;
- this._index = 0;
- this._parse = parsers[type];
- this.bbox = [header.getFloat64(36, true), header.getFloat64(44, true), header.getFloat64(52, true), header.getFloat64(60, true)];
- }
- var prototype$2 = Shp.prototype;
- prototype$2.read = shp_read;
- prototype$2.cancel = cancel;
- function noop() {}
- var shapefile_cancel = function() {
- return Promise.all([
- this._dbf && this._dbf.cancel(),
- this._shp.cancel()
- ]).then(noop);
- };
- var shapefile_read = function() {
- var that = this;
- return Promise.all([
- that._dbf ? that._dbf.read() : {value: {}},
- that._shp.read()
- ]).then(function(results) {
- var dbf = results[0], shp = results[1];
- return shp.done ? shp : {
- done: false,
- value: {
- type: "Feature",
- properties: dbf.value,
- geometry: shp.value
- }
- };
- });
- };
- var shapefile = function(shpSource, dbfSource, decoder) {
- return Promise.all([
- shp(shpSource),
- dbfSource && dbf(dbfSource, decoder)
- ]).then(function(sources) {
- return new Shapefile(sources[0], sources[1]);
- });
- };
- function Shapefile(shp$$1, dbf$$1) {
- this._shp = shp$$1;
- this._dbf = dbf$$1;
- this.bbox = shp$$1.bbox;
- }
- var prototype$1 = Shapefile.prototype;
- prototype$1.read = shapefile_read;
- prototype$1.cancel = shapefile_cancel;
- function open(shp$$1, dbf$$1, options) {
- if (typeof dbf$$1 === "string") {
- if (!/\.dbf$/.test(dbf$$1)) dbf$$1 += ".dbf";
- dbf$$1 = path(dbf$$1);
- } else if (dbf$$1 instanceof ArrayBuffer || dbf$$1 instanceof Uint8Array) {
- dbf$$1 = array(dbf$$1);
- } else if (dbf$$1 != null) {
- dbf$$1 = stream(dbf$$1);
- }
- if (typeof shp$$1 === "string") {
- if (!/\.shp$/.test(shp$$1)) shp$$1 += ".shp";
- if (dbf$$1 === undefined) dbf$$1 = path(shp$$1.substring(0, shp$$1.length - 4) + ".dbf").catch(function() {});
- shp$$1 = path(shp$$1);
- } else if (shp$$1 instanceof ArrayBuffer || shp$$1 instanceof Uint8Array) {
- shp$$1 = array(shp$$1);
- } else {
- shp$$1 = stream(shp$$1);
- }
- return Promise.all([shp$$1, dbf$$1]).then(function(sources) {
- var shp$$1 = sources[0], dbf$$1 = sources[1], encoding = "windows-1252";
- if (options && options.encoding != null) encoding = options.encoding;
- return shapefile(shp$$1, dbf$$1, dbf$$1 && new TextDecoder(encoding));
- });
- }
- function openShp(source) {
- if (typeof source === "string") {
- if (!/\.shp$/.test(source)) source += ".shp";
- source = path(source);
- } else if (source instanceof ArrayBuffer || source instanceof Uint8Array) {
- source = array(source);
- } else {
- source = stream(source);
- }
- return Promise.resolve(source).then(shp);
- }
- function openDbf(source, options) {
- var encoding = "windows-1252";
- if (options && options.encoding != null) encoding = options.encoding;
- encoding = new TextDecoder(encoding);
- if (typeof source === "string") {
- if (!/\.dbf$/.test(source)) source += ".dbf";
- source = path(source);
- } else if (source instanceof ArrayBuffer || source instanceof Uint8Array) {
- source = array(source);
- } else {
- source = stream(source);
- }
- return Promise.resolve(source).then(function(source) {
- return dbf(source, encoding);
- });
- }
- function read(shp$$1, dbf$$1, options) {
- return open(shp$$1, dbf$$1, options).then(function(source) {
- var features = [], collection = {type: "FeatureCollection", features: features, bbox: source.bbox};
- return source.read().then(function read(result) {
- if (result.done) return collection;
- features.push(result.value);
- return source.read().then(read);
- });
- });
- }
- exports.open = open;
- exports.openShp = openShp;
- exports.openDbf = openDbf;
- exports.read = read;
- Object.defineProperty(exports, '__esModule', { value: true });
- })));
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