482 lines
14 KiB
JavaScript
482 lines
14 KiB
JavaScript
// https://github.com/mbostock/shapefile Version 0.6.2. Copyright 2017 Mike Bostock.
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(factory((global.shapefile = global.shapefile || {})));
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}(this, (function (exports) { 'use strict';
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var array_cancel = function() {
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this._array = null;
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return Promise.resolve();
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};
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var array_read = function() {
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var array = this._array;
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this._array = null;
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return Promise.resolve(array ? {done: false, value: array} : {done: true, value: undefined});
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};
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function array(array) {
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return new ArraySource(array instanceof Uint8Array ? array : new Uint8Array(array));
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}
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function ArraySource(array) {
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this._array = array;
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}
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ArraySource.prototype.read = array_read;
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ArraySource.prototype.cancel = array_cancel;
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var fetchPath = function(url) {
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return fetch(url).then(function(response) {
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return response.body && response.body.getReader
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? response.body.getReader()
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: response.arrayBuffer().then(array);
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});
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};
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var requestPath = function(url) {
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return new Promise(function(resolve, reject) {
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var request = new XMLHttpRequest;
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request.responseType = "arraybuffer";
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request.onload = function() { resolve(array(request.response)); };
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request.onerror = reject;
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request.ontimeout = reject;
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request.open("GET", url, true);
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request.send();
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});
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};
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function path(path) {
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return (typeof fetch === "function" ? fetchPath : requestPath)(path);
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}
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function stream(source) {
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return typeof source.read === "function" ? source : source.getReader();
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}
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var empty = new Uint8Array(0);
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var slice_cancel = function() {
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return this._source.cancel();
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};
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function concat(a, b) {
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if (!a.length) return b;
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if (!b.length) return a;
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var c = new Uint8Array(a.length + b.length);
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c.set(a);
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c.set(b, a.length);
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return c;
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}
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var slice_read = function() {
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var that = this, array = that._array.subarray(that._index);
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return that._source.read().then(function(result) {
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that._array = empty;
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that._index = 0;
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return result.done ? (array.length > 0
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? {done: false, value: array}
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: {done: true, value: undefined})
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: {done: false, value: concat(array, result.value)};
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});
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};
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var slice_slice = function(length) {
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if ((length |= 0) < 0) throw new Error("invalid length");
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var that = this, index = this._array.length - this._index;
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// If the request fits within the remaining buffer, resolve it immediately.
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if (this._index + length <= this._array.length) {
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return Promise.resolve(this._array.subarray(this._index, this._index += length));
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}
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// Otherwise, read chunks repeatedly until the request is fulfilled.
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var array = new Uint8Array(length);
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array.set(this._array.subarray(this._index));
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return (function read() {
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return that._source.read().then(function(result) {
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// When done, it’s possible the request wasn’t fully fullfilled!
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// If so, the pre-allocated array is too big and needs slicing.
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if (result.done) {
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that._array = empty;
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that._index = 0;
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return index > 0 ? array.subarray(0, index) : null;
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}
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// If this chunk fulfills the request, return the resulting array.
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if (index + result.value.length >= length) {
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that._array = result.value;
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that._index = length - index;
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array.set(result.value.subarray(0, length - index), index);
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return array;
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}
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// Otherwise copy this chunk into the array, then read the next chunk.
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array.set(result.value, index);
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index += result.value.length;
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return read();
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});
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})();
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};
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function slice(source) {
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return typeof source.slice === "function" ? source :
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new SliceSource(typeof source.read === "function" ? source
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: source.getReader());
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}
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function SliceSource(source) {
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this._source = source;
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this._array = empty;
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this._index = 0;
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}
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SliceSource.prototype.read = slice_read;
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SliceSource.prototype.slice = slice_slice;
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SliceSource.prototype.cancel = slice_cancel;
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var dbf_cancel = function() {
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return this._source.cancel();
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};
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var readBoolean = function(value) {
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return /^[nf]$/i.test(value) ? false
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: /^[yt]$/i.test(value) ? true
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: null;
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};
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var readDate = function(value) {
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return new Date(+value.substring(0, 4), value.substring(4, 6) - 1, +value.substring(6, 8));
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};
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var readNumber = function(value) {
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return !(value = value.trim()) || isNaN(value = +value) ? null : value;
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};
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var readString = function(value) {
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return value.trim() || null;
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};
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var types = {
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B: readNumber,
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C: readString,
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D: readDate,
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F: readNumber,
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L: readBoolean,
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M: readNumber,
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N: readNumber
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};
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var dbf_read = function() {
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var that = this, i = 1;
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return that._source.slice(that._recordLength).then(function(value) {
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return value && (value[0] !== 0x1a) ? {done: false, value: that._fields.reduce(function(p, f) {
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p[f.name] = types[f.type](that._decode(value.subarray(i, i += f.length)));
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return p;
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}, {})} : {done: true, value: undefined};
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});
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};
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var view = function(array) {
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return new DataView(array.buffer, array.byteOffset, array.byteLength);
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};
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var dbf = function(source, decoder) {
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source = slice(source);
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return source.slice(32).then(function(array) {
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var head = view(array);
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return source.slice(head.getUint16(8, true) - 32).then(function(array) {
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return new Dbf(source, decoder, head, view(array));
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});
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});
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};
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function Dbf(source, decoder, head, body) {
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this._source = source;
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this._decode = decoder.decode.bind(decoder);
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this._recordLength = head.getUint16(10, true);
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this._fields = [];
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for (var n = 0; body.getUint8(n) !== 0x0d; n += 32) {
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for (var j = 0; j < 11; ++j) if (body.getUint8(n + j) === 0) break;
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this._fields.push({
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name: this._decode(new Uint8Array(body.buffer, body.byteOffset + n, j)),
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type: String.fromCharCode(body.getUint8(n + 11)),
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length: body.getUint8(n + 16)
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});
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}
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}
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var prototype = Dbf.prototype;
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prototype.read = dbf_read;
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prototype.cancel = dbf_cancel;
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function cancel() {
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return this._source.cancel();
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}
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var readMultiPoint = function(record) {
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var i = 40, j, n = record.getInt32(36, true), coordinates = new Array(n);
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for (j = 0; j < n; ++j, i += 16) coordinates[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
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return {type: "MultiPoint", coordinates: coordinates};
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};
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var readNull = function() {
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return null;
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};
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var readPoint = function(record) {
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return {type: "Point", coordinates: [record.getFloat64(4, true), record.getFloat64(12, true)]};
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};
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var readPolygon = function(record) {
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var i = 44, j, n = record.getInt32(36, true), m = record.getInt32(40, true), parts = new Array(n), points = new Array(m), polygons = [], holes = [];
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for (j = 0; j < n; ++j, i += 4) parts[j] = record.getInt32(i, true);
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for (j = 0; j < m; ++j, i += 16) points[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
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parts.forEach(function(i, j) {
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var ring = points.slice(i, parts[j + 1]);
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if (ringClockwise(ring)) polygons.push([ring]);
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else holes.push(ring);
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});
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holes.forEach(function(hole) {
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polygons.some(function(polygon) {
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if (ringContainsSome(polygon[0], hole)) {
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polygon.push(hole);
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return true;
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}
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}) || polygons.push([hole]);
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});
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return polygons.length === 1
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? {type: "Polygon", coordinates: polygons[0]}
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: {type: "MultiPolygon", coordinates: polygons};
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};
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function ringClockwise(ring) {
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if ((n = ring.length) < 4) return false;
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var i = 0, n, area = ring[n - 1][1] * ring[0][0] - ring[n - 1][0] * ring[0][1];
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while (++i < n) area += ring[i - 1][1] * ring[i][0] - ring[i - 1][0] * ring[i][1];
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return area >= 0;
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}
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function ringContainsSome(ring, hole) {
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var i = -1, n = hole.length, c;
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while (++i < n) {
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if (c = ringContains(ring, hole[i])) {
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return c > 0;
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}
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}
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return false;
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}
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function ringContains(ring, point) {
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var x = point[0], y = point[1], contains = -1;
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for (var i = 0, n = ring.length, j = n - 1; i < n; j = i++) {
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var pi = ring[i], xi = pi[0], yi = pi[1],
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pj = ring[j], xj = pj[0], yj = pj[1];
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if (segmentContains(pi, pj, point)) {
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return 0;
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}
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if (((yi > y) !== (yj > y)) && ((x < (xj - xi) * (y - yi) / (yj - yi) + xi))) {
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contains = -contains;
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}
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}
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return contains;
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}
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function segmentContains(p0, p1, p2) {
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var x20 = p2[0] - p0[0], y20 = p2[1] - p0[1];
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if (x20 === 0 && y20 === 0) return true;
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var x10 = p1[0] - p0[0], y10 = p1[1] - p0[1];
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if (x10 === 0 && y10 === 0) return false;
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var t = (x20 * x10 + y20 * y10) / (x10 * x10 + y10 * y10);
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return t < 0 || t > 1 ? false : t === 0 || t === 1 ? true : t * x10 === x20 && t * y10 === y20;
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}
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var readPolyLine = function(record) {
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var i = 44, j, n = record.getInt32(36, true), m = record.getInt32(40, true), parts = new Array(n), points = new Array(m);
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for (j = 0; j < n; ++j, i += 4) parts[j] = record.getInt32(i, true);
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for (j = 0; j < m; ++j, i += 16) points[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
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return n === 1
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? {type: "LineString", coordinates: points}
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: {type: "MultiLineString", coordinates: parts.map(function(i, j) { return points.slice(i, parts[j + 1]); })};
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};
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var readPolyLineZ = function(record) {
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var i = 44, j, n = record.getInt32(36, true), m = record.getInt32(40, true), parts = new Array(n), points = new Array(m);
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for (j = 0; j < n; ++j, i += 4) parts[j] = record.getInt32(i, true);
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for (j = 0; j < m; ++j, i += 16) points[j] = [record.getFloat64(i, true), record.getFloat64(i + 8, true)];
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// Advance two doubles (z min, z max)
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i += 16;
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for (j = 0; j < m; ++j, i += 8) points[j].push(record.getFloat64(i, true));
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return n === 1
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? {type: "LineStringZ", coordinates: points}
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: {type: "MultiLineStringZ", coordinates: parts.map(function(i, j) { return points.slice(i, parts[j + 1]); })};
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};
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var shp_read = function() {
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var that = this;
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return that._source.slice(8).then(function(array) {
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if (array == null) return {done: true, value: undefined};
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var header = view(array);
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return that._source.slice(header.getInt32(4, false) * 2).then(function(array) {
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var record = view(array);
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return {done: false, value: record.getInt32(0, true) ? that._type(record) : readNull()};
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});
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});
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};
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var types$1 = {
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0: readNull,
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1: readPoint,
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3: readPolyLine,
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5: readPolygon,
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8: readMultiPoint,
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11: readPoint,
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13: readPolyLineZ,
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15: readPolygon,
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18: readMultiPoint
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};
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var shp = function(source) {
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source = slice(source);
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return source.slice(100).then(function(array) {
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return new Shp(source, view(array));
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});
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};
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function Shp(source, header) {
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var type = header.getInt32(32, true);
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if (!(type in types$1)) throw new Error("unsupported shape type: " + type);
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this._source = source;
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this._type = types$1[type];
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this.bbox = [header.getFloat64(36, true), header.getFloat64(44, true), header.getFloat64(52, true), header.getFloat64(60, true)];
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}
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var prototype$2 = Shp.prototype;
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prototype$2.read = shp_read;
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prototype$2.cancel = cancel;
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function noop() {}
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var shapefile_cancel = function() {
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return Promise.all([
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this._dbf && this._dbf.cancel(),
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this._shp.cancel()
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]).then(noop);
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};
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var shapefile_read = function() {
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var that = this;
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return Promise.all([
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that._dbf ? that._dbf.read() : {value: {}},
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that._shp.read()
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]).then(function(results) {
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var dbf = results[0], shp = results[1];
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return shp.done ? shp : {
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done: false,
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value: {
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type: "Feature",
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properties: dbf.value,
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geometry: shp.value
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}
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};
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});
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};
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var shapefile = function(shpSource, dbfSource, decoder) {
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return Promise.all([
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shp(shpSource),
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dbfSource && dbf(dbfSource, decoder)
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]).then(function(sources) {
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return new Shapefile(sources[0], sources[1]);
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});
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};
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function Shapefile(shp$$1, dbf$$1) {
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this._shp = shp$$1;
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this._dbf = dbf$$1;
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this.bbox = shp$$1.bbox;
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}
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var prototype$1 = Shapefile.prototype;
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prototype$1.read = shapefile_read;
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prototype$1.cancel = shapefile_cancel;
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function open(shp$$1, dbf$$1, options) {
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if (typeof dbf$$1 === "string") {
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if (!/\.dbf$/.test(dbf$$1)) dbf$$1 += ".dbf";
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dbf$$1 = path(dbf$$1, options);
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} else if (dbf$$1 instanceof ArrayBuffer || dbf$$1 instanceof Uint8Array) {
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dbf$$1 = array(dbf$$1);
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} else if (dbf$$1 != null) {
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dbf$$1 = stream(dbf$$1);
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}
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if (typeof shp$$1 === "string") {
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if (!/\.shp$/.test(shp$$1)) shp$$1 += ".shp";
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if (dbf$$1 === undefined) dbf$$1 = path(shp$$1.substring(0, shp$$1.length - 4) + ".dbf", options).catch(function() {});
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shp$$1 = path(shp$$1, options);
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} else if (shp$$1 instanceof ArrayBuffer || shp$$1 instanceof Uint8Array) {
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shp$$1 = array(shp$$1);
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} else {
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shp$$1 = stream(shp$$1);
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}
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return Promise.all([shp$$1, dbf$$1]).then(function(sources) {
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var shp$$1 = sources[0], dbf$$1 = sources[1], encoding = "windows-1252";
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if (options && options.encoding != null) encoding = options.encoding;
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return shapefile(shp$$1, dbf$$1, dbf$$1 && new TextDecoder(encoding));
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});
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}
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function openShp(source, options) {
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if (typeof source === "string") {
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if (!/\.shp$/.test(source)) source += ".shp";
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source = path(source, options);
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} else if (source instanceof ArrayBuffer || source instanceof Uint8Array) {
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source = array(source);
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} else {
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source = stream(source);
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}
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return Promise.resolve(source).then(shp);
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}
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function openDbf(source, options) {
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var encoding = "windows-1252";
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if (options && options.encoding != null) encoding = options.encoding;
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encoding = new TextDecoder(encoding);
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if (typeof source === "string") {
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if (!/\.dbf$/.test(source)) source += ".dbf";
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source = path(source, options);
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} else if (source instanceof ArrayBuffer || source instanceof Uint8Array) {
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source = array(source);
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} else {
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source = stream(source);
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}
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return Promise.resolve(source).then(function(source) {
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return dbf(source, encoding);
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});
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}
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function read(shp$$1, dbf$$1, options) {
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return open(shp$$1, dbf$$1, options).then(function(source) {
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var features = [], collection = {type: "FeatureCollection", features: features, bbox: source.bbox};
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return source.read().then(function read(result) {
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if (result.done) return collection;
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features.push(result.value);
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return source.read().then(read);
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});
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});
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}
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exports.open = open;
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exports.openShp = openShp;
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exports.openDbf = openDbf;
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exports.read = read;
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Object.defineProperty(exports, '__esModule', { value: true });
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})));
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