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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  "use strict";
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  var Pos = CodeMirror.Pos;
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  function findParagraph(cm, pos, options) {
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    var startRE = options.paragraphStart || cm.getHelper(pos, "paragraphStart");
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    for (var start = pos.line, first = cm.firstLine(); start > first; --start) {
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      var line = cm.getLine(start);
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      if (startRE && startRE.test(line)) break;
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      if (!/\S/.test(line)) { ++start; break; }
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    }
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    var endRE = options.paragraphEnd || cm.getHelper(pos, "paragraphEnd");
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    for (var end = pos.line + 1, last = cm.lastLine(); end <= last; ++end) {
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      var line = cm.getLine(end);
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      if (endRE && endRE.test(line)) { ++end; break; }
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      if (!/\S/.test(line)) break;
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    }
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    return {from: start, to: end};
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  }
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  function findBreakPoint(text, column, wrapOn, killTrailingSpace, forceBreak) {
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    var at = column
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    while (at < text.length && text.charAt(at) == " ") at++
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    for (; at > 0; --at)
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      if (wrapOn.test(text.slice(at - 1, at + 1))) break;
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    if (!forceBreak && at <= text.match(/^[ \t]*/)[0].length) {
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      // didn't find a break point before column, in non-forceBreak mode try to
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      // find one after 'column'.
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      for (at = column + 1; at < text.length - 1; ++at) {
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        if (wrapOn.test(text.slice(at - 1, at + 1))) break;
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      }
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    }
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    for (var first = true;; first = false) {
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      var endOfText = at;
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      if (killTrailingSpace)
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        while (text.charAt(endOfText - 1) == " ") --endOfText;
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      if (endOfText == 0 && first) at = column;
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      else return {from: endOfText, to: at};
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    }
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  }
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  function wrapRange(cm, from, to, options) {
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    from = cm.clipPos(from); to = cm.clipPos(to);
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    var column = options.column || 80;
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    var wrapOn = options.wrapOn || /\s\S|-[^\.\d]/;
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    var forceBreak = options.forceBreak !== false;
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    var killTrailing = options.killTrailingSpace !== false;
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    var changes = [], curLine = "", curNo = from.line;
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    var lines = cm.getRange(from, to, false);
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    if (!lines.length) return null;
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    var leadingSpace = lines[0].match(/^[ \t]*/)[0];
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    if (leadingSpace.length >= column) column = leadingSpace.length + 1
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    for (var i = 0; i < lines.length; ++i) {
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      var text = lines[i], oldLen = curLine.length, spaceInserted = 0;
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      if (curLine && text && !wrapOn.test(curLine.charAt(curLine.length - 1) + text.charAt(0))) {
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        curLine += " ";
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        spaceInserted = 1;
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      }
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      var spaceTrimmed = "";
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      if (i) {
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        spaceTrimmed = text.match(/^\s*/)[0];
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        text = text.slice(spaceTrimmed.length);
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      }
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      curLine += text;
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      if (i) {
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        var firstBreak = curLine.length > column && leadingSpace == spaceTrimmed &&
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          findBreakPoint(curLine, column, wrapOn, killTrailing, forceBreak);
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        // If this isn't broken, or is broken at a different point, remove old break
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        if (!firstBreak || firstBreak.from != oldLen || firstBreak.to != oldLen + spaceInserted) {
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          changes.push({text: [spaceInserted ? " " : ""],
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                        from: Pos(curNo, oldLen),
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                        to: Pos(curNo + 1, spaceTrimmed.length)});
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        } else {
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          curLine = leadingSpace + text;
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          ++curNo;
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        }
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      }
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      while (curLine.length > column) {
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        var bp = findBreakPoint(curLine, column, wrapOn, killTrailing, forceBreak);
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        if (bp.from != bp.to ||
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            forceBreak && leadingSpace !== curLine.slice(0, bp.to)) {
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          changes.push({text: ["", leadingSpace],
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                        from: Pos(curNo, bp.from),
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                        to: Pos(curNo, bp.to)});
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          curLine = leadingSpace + curLine.slice(bp.to);
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          ++curNo;
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        } else {
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          break;
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        }
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      }
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    }
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    if (changes.length) cm.operation(function() {
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      for (var i = 0; i < changes.length; ++i) {
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        var change = changes[i];
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        if (change.text || CodeMirror.cmpPos(change.from, change.to))
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          cm.replaceRange(change.text, change.from, change.to);
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      }
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    });
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    return changes.length ? {from: changes[0].from, to: CodeMirror.changeEnd(changes[changes.length - 1])} : null;
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  }
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  CodeMirror.defineExtension("wrapParagraph", function(pos, options) {
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    options = options || {};
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    if (!pos) pos = this.getCursor();
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    var para = findParagraph(this, pos, options);
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    return wrapRange(this, Pos(para.from, 0), Pos(para.to - 1), options);
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  });
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  CodeMirror.commands.wrapLines = function(cm) {
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    cm.operation(function() {
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      var ranges = cm.listSelections(), at = cm.lastLine() + 1;
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      for (var i = ranges.length - 1; i >= 0; i--) {
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        var range = ranges[i], span;
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        if (range.empty()) {
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          var para = findParagraph(cm, range.head, {});
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          span = {from: Pos(para.from, 0), to: Pos(para.to - 1)};
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        } else {
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          span = {from: range.from(), to: range.to()};
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        }
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        if (span.to.line >= at) continue;
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        at = span.from.line;
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        wrapRange(cm, span.from, span.to, {});
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      }
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    });
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  };
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  CodeMirror.defineExtension("wrapRange", function(from, to, options) {
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    return wrapRange(this, from, to, options || {});
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  });
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  CodeMirror.defineExtension("wrapParagraphsInRange", function(from, to, options) {
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    options = options || {};
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    var cm = this, paras = [];
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    for (var line = from.line; line <= to.line;) {
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      var para = findParagraph(cm, Pos(line, 0), options);
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      paras.push(para);
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      line = para.to;
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    }
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    var madeChange = false;
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    if (paras.length) cm.operation(function() {
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      for (var i = paras.length - 1; i >= 0; --i)
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        madeChange = madeChange || wrapRange(cm, Pos(paras[i].from, 0), Pos(paras[i].to - 1), options);
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    });
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    return madeChange;
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  });
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});
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