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2 years ago
'use strict';
/*
Copyright 2012-2015, Yahoo Inc.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
*/
function InsertionText(text, consumeBlanks) {
this.text = text;
this.origLength = text.length;
this.offsets = [];
this.consumeBlanks = consumeBlanks;
this.startPos = this.findFirstNonBlank();
this.endPos = this.findLastNonBlank();
}
const WHITE_RE = /[ \f\n\r\t\v\u00A0\u2028\u2029]/;
InsertionText.prototype = {
findFirstNonBlank() {
let pos = -1;
const text = this.text;
const len = text.length;
let i;
for (i = 0; i < len; i += 1) {
if (!text.charAt(i).match(WHITE_RE)) {
pos = i;
break;
}
}
return pos;
},
findLastNonBlank() {
const text = this.text;
const len = text.length;
let pos = text.length + 1;
let i;
for (i = len - 1; i >= 0; i -= 1) {
if (!text.charAt(i).match(WHITE_RE)) {
pos = i;
break;
}
}
return pos;
},
originalLength() {
return this.origLength;
},
insertAt(col, str, insertBefore, consumeBlanks) {
consumeBlanks =
typeof consumeBlanks === 'undefined'
? this.consumeBlanks
: consumeBlanks;
col = col > this.originalLength() ? this.originalLength() : col;
col = col < 0 ? 0 : col;
if (consumeBlanks) {
if (col <= this.startPos) {
col = 0;
}
if (col > this.endPos) {
col = this.origLength;
}
}
const len = str.length;
const offset = this.findOffset(col, len, insertBefore);
const realPos = col + offset;
const text = this.text;
this.text = text.substring(0, realPos) + str + text.substring(realPos);
return this;
},
findOffset(pos, len, insertBefore) {
const offsets = this.offsets;
let offsetObj;
let cumulativeOffset = 0;
let i;
for (i = 0; i < offsets.length; i += 1) {
offsetObj = offsets[i];
if (
offsetObj.pos < pos ||
(offsetObj.pos === pos && !insertBefore)
) {
cumulativeOffset += offsetObj.len;
}
if (offsetObj.pos >= pos) {
break;
}
}
if (offsetObj && offsetObj.pos === pos) {
offsetObj.len += len;
} else {
offsets.splice(i, 0, { pos, len });
}
return cumulativeOffset;
},
wrap(startPos, startText, endPos, endText, consumeBlanks) {
this.insertAt(startPos, startText, true, consumeBlanks);
this.insertAt(endPos, endText, false, consumeBlanks);
return this;
},
wrapLine(startText, endText) {
this.wrap(0, startText, this.originalLength(), endText);
},
toString() {
return this.text;
}
};
module.exports = InsertionText;