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