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Book Pauk
359
server/core/sax.js
Normal file
359
server/core/sax.js
Normal file
@@ -0,0 +1,359 @@
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function parseSync(xstr, options) {
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const dummy = () => {};
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let {onStartNode: _onStartNode = dummy,
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onEndNode: _onEndNode = dummy,
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onTextNode: _onTextNode = dummy,
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onCdata: _onCdata = dummy,
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onComment: _onComment = dummy,
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onProgress: _onProgress = dummy,
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innerCut = new Set()
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} = options;
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let i = 0;
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const len = xstr.length;
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const progStep = len/20;
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let nextProg = 0;
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let cutCounter = 0;
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let cutTag = '';
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let inCdata;
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let inComment;
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let leftData = 0;
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while (i < len) {
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inCdata = false;
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inComment = false;
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let singleTag = false;
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let left = xstr.indexOf('<', i);
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if (left < 0)
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break;
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leftData = left;
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if (left < len - 2 && xstr[left + 1] == '!') {
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if (xstr[left + 2] == '-') {
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const leftComment = xstr.indexOf('<!--', left);
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if (leftComment == left) {
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inComment = true;
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leftData = left + 3;
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}
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}
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if (!inComment && xstr[left + 2] == '[') {
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const leftCdata = xstr.indexOf('<![CDATA[', left);
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if (leftCdata == left) {
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inCdata = true;
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leftData = left + 8;
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}
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}
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}
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if (left != i) {
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const text = xstr.substr(i, left - i);
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_onTextNode(text, cutCounter, cutTag);
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}
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let right = null;
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let rightData = null;
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if (inCdata) {
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rightData = xstr.indexOf(']]>', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData + 2;
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} else if (inComment) {
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rightData = xstr.indexOf('-->', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData + 2;
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} else {
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rightData = xstr.indexOf('>', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData;
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if (xstr[right - 1] === '/') {
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singleTag = true;
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rightData--;
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}
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}
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let tagData = xstr.substr(leftData + 1, rightData - leftData - 1);
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if (inCdata) {
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_onCdata(tagData, cutCounter, cutTag);
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} else if (inComment) {
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_onComment(tagData, cutCounter, cutTag);
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} else {
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let tag = '';
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let tail = '';
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const firstSpace = tagData.indexOf(' ');
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if (firstSpace >= 0) {
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tail = tagData.substr(firstSpace);
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tag = tagData.substr(0, firstSpace);
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} else {
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tag = tagData;
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}
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tag = tag.toLowerCase();
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let endTag = (singleTag ? tag : '');
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if (tag === '' || tag[0] !== '/') {
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_onStartNode(tag, tail, singleTag, cutCounter, cutTag);
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} else {
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endTag = tag.substr(1);
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}
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if (endTag)
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_onEndNode(endTag, tail, singleTag, cutCounter, cutTag);
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if (innerCut.has(tag) && (!cutCounter || cutTag === tag)) {
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if (!cutCounter)
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cutTag = tag;
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cutCounter++;
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}
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if (cutTag === endTag) {
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cutCounter = (cutCounter > 0 ? cutCounter - 1 : 0);
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if (!cutCounter)
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cutTag = '';
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}
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}
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if (right >= nextProg) {
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_onProgress(Math.round(right/(len + 1)*100));
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nextProg += progStep;
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}
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i = right + 1;
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}
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if (i < len) {
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if (inCdata) {
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_onCdata(xstr.substr(leftData, len - leftData), cutCounter, cutTag);
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} else if (inComment) {
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_onComment(xstr.substr(leftData, len - leftData), cutCounter, cutTag);
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} else {
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_onTextNode(xstr.substr(i, len - i), cutCounter, cutTag);
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}
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}
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_onProgress(100);
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}
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//асинхронная копия parseSync
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//делается заменой "_on" => "await _on" после while
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async function parse(xstr, options) {
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const dummy = () => {};
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let {onStartNode: _onStartNode = dummy,
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onEndNode: _onEndNode = dummy,
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onTextNode: _onTextNode = dummy,
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onCdata: _onCdata = dummy,
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onComment: _onComment = dummy,
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onProgress: _onProgress = dummy,
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innerCut = new Set()
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} = options;
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let i = 0;
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const len = xstr.length;
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const progStep = len/20;
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let nextProg = 0;
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let cutCounter = 0;
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let cutTag = '';
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let inCdata;
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let inComment;
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let leftData = 0;
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while (i < len) {
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inCdata = false;
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inComment = false;
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let singleTag = false;
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let left = xstr.indexOf('<', i);
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if (left < 0)
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break;
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leftData = left;
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if (left < len - 2 && xstr[left + 1] == '!') {
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if (xstr[left + 2] == '-') {
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const leftComment = xstr.indexOf('<!--', left);
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if (leftComment == left) {
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inComment = true;
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leftData = left + 3;
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}
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}
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if (!inComment && xstr[left + 2] == '[') {
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const leftCdata = xstr.indexOf('<![CDATA[', left);
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if (leftCdata == left) {
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inCdata = true;
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leftData = left + 8;
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}
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}
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}
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if (left != i) {
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const text = xstr.substr(i, left - i);
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await _onTextNode(text, cutCounter, cutTag);
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}
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let right = null;
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let rightData = null;
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if (inCdata) {
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rightData = xstr.indexOf(']]>', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData + 2;
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} else if (inComment) {
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rightData = xstr.indexOf('-->', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData + 2;
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} else {
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rightData = xstr.indexOf('>', leftData + 1);
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if (rightData < 0)
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break;
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right = rightData;
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if (xstr[right - 1] === '/') {
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singleTag = true;
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rightData--;
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}
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}
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let tagData = xstr.substr(leftData + 1, rightData - leftData - 1);
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if (inCdata) {
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await _onCdata(tagData, cutCounter, cutTag);
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} else if (inComment) {
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await _onComment(tagData, cutCounter, cutTag);
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} else {
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let tag = '';
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let tail = '';
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const firstSpace = tagData.indexOf(' ');
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if (firstSpace >= 0) {
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tail = tagData.substr(firstSpace);
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tag = tagData.substr(0, firstSpace);
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} else {
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tag = tagData;
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}
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tag = tag.toLowerCase();
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let endTag = (singleTag ? tag : '');
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if (tag === '' || tag[0] !== '/') {
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await _onStartNode(tag, tail, singleTag, cutCounter, cutTag);
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} else {
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endTag = tag.substr(1);
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}
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if (endTag)
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await _onEndNode(endTag, tail, singleTag, cutCounter, cutTag);
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if (innerCut.has(tag) && (!cutCounter || cutTag === tag)) {
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if (!cutCounter)
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cutTag = tag;
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cutCounter++;
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}
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if (cutTag === endTag) {
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cutCounter = (cutCounter > 0 ? cutCounter - 1 : 0);
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if (!cutCounter)
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cutTag = '';
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}
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}
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if (right >= nextProg) {
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await _onProgress(Math.round(right/(len + 1)*100));
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nextProg += progStep;
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}
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i = right + 1;
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}
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if (i < len) {
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if (inCdata) {
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await _onCdata(xstr.substr(leftData, len - leftData), cutCounter, cutTag);
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} else if (inComment) {
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await _onComment(xstr.substr(leftData, len - leftData), cutCounter, cutTag);
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} else {
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await _onTextNode(xstr.substr(i, len - i), cutCounter, cutTag);
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}
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}
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await _onProgress(100);
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}
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function getAttrsSync(tail) {
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let result = {};
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let name = '';
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let value = '';
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let vOpen = '';
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let inName = false;
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let inValue = false;
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let waitValue = false;
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let waitEq = false;
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const pushResult = () => {
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if (name != '') {
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let ns = '';
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if (name.indexOf(':') >= 0) {
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[ns, name] = name.split(':');
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}
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result[name] = {value, ns};
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}
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name = '';
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value = '';
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vOpen = '';
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inName = false;
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inValue = false;
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waitValue = false;
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waitEq = false;
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};
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tail = tail.replace(/[\t\n\r]/g, ' ');
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for (let i = 0; i < tail.length; i++) {
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const c = tail.charAt(i);
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if (c == ' ') {
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if (inValue) {
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if (vOpen == '"')
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value += c;
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else
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pushResult();
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} else if (inName) {
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waitEq = true;
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inName = false;
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}
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} else if (!inValue && c == '=') {
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waitEq = false;
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waitValue = true;
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inName = false;
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} else if (c == '"') {
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if (inValue) {
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pushResult();
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} else if (waitValue) {
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inValue = true;
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vOpen = '"';
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}
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} else if (inValue) {
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value += c;
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} else if (inName) {
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name += c;
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} else if (waitEq) {
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pushResult();
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inName = true;
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name = c;
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} else if (waitValue) {
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waitValue = false;
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inValue = true;
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vOpen = ' ';
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value = c;
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} else {
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inName = true;
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name = c;
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}
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}
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if (name != '')
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pushResult();
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return result;
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}
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module.exports = {
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parseSync,
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getAttrsSync,
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parse
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}
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Reference in New Issue
Block a user