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