133 lines
4.5 KiB
JavaScript
133 lines
4.5 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.TextRange = void 0;
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/**
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* Efficiently references a range of text from a string buffer.
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*/
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var TextRange = /** @class */ (function () {
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function TextRange(buffer, pos, end) {
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this.buffer = buffer;
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this.pos = pos;
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this.end = end;
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this._validateBounds();
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}
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/**
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* Constructs a TextRange that corresponds to an entire string object.
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*/
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TextRange.fromString = function (buffer) {
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return new TextRange(buffer, 0, buffer.length);
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};
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/**
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* Constructs a TextRange that corresponds to an entire string object.
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*/
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TextRange.fromStringRange = function (buffer, pos, end) {
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return new TextRange(buffer, pos, end);
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};
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Object.defineProperty(TextRange.prototype, "length", {
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/**
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* Returns the length of the text range.
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* @remarks
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* This value is calculated as the `end` property minus the `pos` property.
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*/
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get: function () {
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return this.end - this.pos;
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},
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enumerable: false,
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configurable: true
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});
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/**
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* Constructs a TextRange that corresponds to a different range of an existing buffer.
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*/
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TextRange.prototype.getNewRange = function (pos, end) {
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return new TextRange(this.buffer, pos, end);
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};
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/**
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* Returns true if the length of the range is zero. Note that the object reference may not
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* be equal to `TextRange.empty`, and the buffer may be different.
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*/
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TextRange.prototype.isEmpty = function () {
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return this.pos === this.end;
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};
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/**
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* Returns the range from the associated string buffer.
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*/
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TextRange.prototype.toString = function () {
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return this.buffer.substring(this.pos, this.end);
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};
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/**
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* Returns a debugging dump of the range, indicated via custom delimiters.
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* @remarks
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* For example if the delimiters are "[" and "]", and the range is 3..5 inside "1234567",
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* then the output would be "12[345]67".
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*/
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TextRange.prototype.getDebugDump = function (posDelimiter, endDelimiter) {
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return (this.buffer.substring(0, this.pos) +
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posDelimiter +
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this.buffer.substring(this.pos, this.end) +
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endDelimiter +
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this.buffer.substring(this.end));
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};
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/**
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* Calculates the line and column number for the specified offset into the buffer.
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*
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* @remarks
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* This is a potentially expensive operation.
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*
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* @param index - an integer offset
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* @param buffer - the buffer
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*/
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TextRange.prototype.getLocation = function (index) {
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if (index < 0 || index > this.buffer.length) {
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// No match
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return { line: 0, column: 0 };
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}
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// TODO: Consider caching or optimizing this somehow
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var line = 1;
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var column = 1;
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var currentIndex = 0;
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while (currentIndex < index) {
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var current = this.buffer[currentIndex];
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++currentIndex;
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if (current === '\r') {
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// CR
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// Ignore '\r' and assume it will always have an accompanying '\n'
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continue;
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}
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if (current === '\n') {
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// LF
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++line;
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column = 1;
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}
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else {
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// NOTE: For consistency with the TypeScript compiler, a tab character is assumed
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// to advance by one column
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++column;
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}
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}
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return { line: line, column: column };
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};
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TextRange.prototype._validateBounds = function () {
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if (this.pos < 0) {
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throw new Error('TextRange.pos cannot be negative');
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}
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if (this.end < 0) {
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throw new Error('TextRange.end cannot be negative');
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}
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if (this.end < this.pos) {
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throw new Error('TextRange.end cannot be smaller than TextRange.pos');
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}
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if (this.pos > this.buffer.length) {
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throw new Error('TextRange.pos cannot exceed the associated text buffer length');
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}
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if (this.end > this.buffer.length) {
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throw new Error('TextRange.end cannot exceed the associated text buffer length');
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}
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};
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/**
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* Used to represent an empty or unknown range.
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*/
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TextRange.empty = new TextRange('', 0, 0);
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return TextRange;
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}());
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exports.TextRange = TextRange;
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//# sourceMappingURL=TextRange.js.map
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