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259 строки
7.6 KiB
259 строки
7.6 KiB
/**
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* TXT export
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*/
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/*
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* 2013 John McLear
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const Changeset = require('ep_etherpad-lite/static/js/Changeset');
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const padManager = require('../db/PadManager');
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const _analyzeLine = require('./ExportHelper')._analyzeLine;
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// This is slightly different than the HTML method as it passes the output to getTXTFromAText
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const getPadTXT = async function (pad, revNum) {
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let atext = pad.atext;
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if (revNum != undefined) {
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// fetch revision atext
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atext = await pad.getInternalRevisionAText(revNum);
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}
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// convert atext to html
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return getTXTFromAtext(pad, atext);
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};
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// This is different than the functionality provided in ExportHtml as it provides formatting
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// functionality that is designed specifically for TXT exports
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function getTXTFromAtext(pad, atext, authorColors) {
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const apool = pad.apool();
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const textLines = atext.text.slice(0, -1).split('\n');
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const attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
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const props = ['heading1', 'heading2', 'bold', 'italic', 'underline', 'strikethrough'];
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const anumMap = {};
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const css = '';
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props.forEach((propName, i) => {
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const propTrueNum = apool.putAttrib([propName, true], true);
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if (propTrueNum >= 0) {
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anumMap[propTrueNum] = i;
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}
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});
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function getLineTXT(text, attribs) {
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const propVals = [false, false, false];
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const ENTER = 1;
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const STAY = 2;
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const LEAVE = 0;
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// Use order of tags (b/i/u) as order of nesting, for simplicity
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// and decent nesting. For example,
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// <b>Just bold<b> <b><i>Bold and italics</i></b> <i>Just italics</i>
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// becomes
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// <b>Just bold <i>Bold and italics</i></b> <i>Just italics</i>
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const taker = Changeset.stringIterator(text);
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const assem = Changeset.stringAssembler();
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let idx = 0;
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function processNextChars(numChars) {
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if (numChars <= 0) {
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return;
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}
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const iter = Changeset.opIterator(Changeset.subattribution(attribs, idx, idx + numChars));
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idx += numChars;
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while (iter.hasNext()) {
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const o = iter.next();
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var propChanged = false;
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Changeset.eachAttribNumber(o.attribs, (a) => {
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if (a in anumMap) {
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const i = anumMap[a]; // i = 0 => bold, etc.
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if (!propVals[i]) {
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propVals[i] = ENTER;
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propChanged = true;
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} else {
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propVals[i] = STAY;
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}
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}
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});
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for (var i = 0; i < propVals.length; i++) {
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if (propVals[i] === true) {
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propVals[i] = LEAVE;
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propChanged = true;
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} else if (propVals[i] === STAY) {
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// set it back
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propVals[i] = true;
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}
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}
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// now each member of propVal is in {false,LEAVE,ENTER,true}
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// according to what happens at start of span
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if (propChanged) {
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// leaving bold (e.g.) also leaves italics, etc.
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let left = false;
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for (var i = 0; i < propVals.length; i++) {
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const v = propVals[i];
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if (!left) {
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if (v === LEAVE) {
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left = true;
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}
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} else if (v === true) {
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// tag will be closed and re-opened
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propVals[i] = STAY;
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}
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}
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var tags2close = [];
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for (var i = propVals.length - 1; i >= 0; i--) {
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if (propVals[i] === LEAVE) {
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// emitCloseTag(i);
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tags2close.push(i);
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propVals[i] = false;
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} else if (propVals[i] === STAY) {
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// emitCloseTag(i);
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tags2close.push(i);
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}
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}
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for (var i = 0; i < propVals.length; i++) {
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if (propVals[i] === ENTER || propVals[i] === STAY) {
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propVals[i] = true;
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}
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}
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// propVals is now all {true,false} again
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} // end if (propChanged)
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let chars = o.chars;
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if (o.lines) {
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// exclude newline at end of line, if present
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chars--;
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}
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const s = taker.take(chars);
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// removes the characters with the code 12. Don't know where they come
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// from but they break the abiword parser and are completly useless
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// s = s.replace(String.fromCharCode(12), "");
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// remove * from s, it's just not needed on a blank line.. This stops
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// plugins from being able to display * at the beginning of a line
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// s = s.replace("*", ""); // Then remove it
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assem.append(s);
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} // end iteration over spans in line
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var tags2close = [];
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for (var i = propVals.length - 1; i >= 0; i--) {
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if (propVals[i]) {
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tags2close.push(i);
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propVals[i] = false;
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}
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}
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} // end processNextChars
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processNextChars(text.length - idx);
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return (assem.toString());
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} // end getLineHTML
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const pieces = [css];
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// Need to deal with constraints imposed on HTML lists; can
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// only gain one level of nesting at once, can't change type
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// mid-list, etc.
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// People might use weird indenting, e.g. skip a level,
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// so we want to do something reasonable there. We also
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// want to deal gracefully with blank lines.
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// => keeps track of the parents level of indentation
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const listNumbers = {};
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let prevListLevel;
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for (let i = 0; i < textLines.length; i++) {
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const line = _analyzeLine(textLines[i], attribLines[i], apool);
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let lineContent = getLineTXT(line.text, line.aline);
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if (line.listTypeName == 'bullet') {
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lineContent = `* ${lineContent}`; // add a bullet
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}
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if (line.listTypeName !== 'number') {
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// We're no longer in an OL so we can reset counting
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for (const key in listNumbers) {
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delete listNumbers[key];
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}
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}
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if (line.listLevel > 0) {
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for (let j = line.listLevel - 1; j >= 0; j--) {
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pieces.push('\t'); // tab indent list numbers..
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if (!listNumbers[line.listLevel]) {
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listNumbers[line.listLevel] = 0;
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}
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}
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if (line.listTypeName == 'number') {
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/*
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* listLevel == amount of indentation
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* listNumber(s) == item number
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*
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* Example:
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* 1. foo
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* 1.1 bah
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* 2. latte
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* 2.1 latte
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*
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* To handle going back to 2.1 when prevListLevel is lower number
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* than current line.listLevel then reset the object value
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*/
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if (line.listLevel < prevListLevel) {
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delete listNumbers[prevListLevel];
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}
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listNumbers[line.listLevel]++;
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if (line.listLevel > 1) {
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let x = 1;
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while (x <= line.listLevel - 1) {
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pieces.push(`${listNumbers[x]}.`);
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x++;
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}
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}
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pieces.push(`${listNumbers[line.listLevel]}. `);
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prevListLevel = line.listLevel;
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}
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pieces.push(lineContent, '\n');
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} else {
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pieces.push(lineContent, '\n');
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}
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}
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return pieces.join('');
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}
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exports.getTXTFromAtext = getTXTFromAtext;
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exports.getPadTXTDocument = async function (padId, revNum) {
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const pad = await padManager.getPad(padId);
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return getPadTXT(pad, revNum);
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};
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