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* UnicodeJS TextString class.
*
* @copyright 2013-2018 UnicodeJS team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* This class provides a simple interface to fetching plain text
* from a data source. The base class reads data from a string, but
* an extended class could provide access to a more complex structure,
* e.g. an array or an HTML document tree.
*
* @class unicodeJS.TextString
* @constructor
* @param {string} text Text
*/
unicodeJS.TextString = function UnicodeJSTextString( text ) {
this.text = text;
};
/* Methods */
/**
* Read code unit at specified position
*
* @method
* @param {number} position Position to read from
* @return {string|null} Code unit, or null if out of bounds
*/
unicodeJS.TextString.prototype.read = function ( position ) {
var dataAt = this.text[ position ];
return dataAt !== undefined ? dataAt : null;
};
/**
* Read unicode codepoint after the specified offset
*
* This is the same as the code unit (=Javascript character) at that offset,
* unless a valid surrogate pair ends at that code unit. (This is consistent
* with the behaviour of String.prototype.codePointAt)
*
* @param {number} position Position
* @return {string|null} Unicode codepoint, or null if out of bounds
*/
unicodeJS.TextString.prototype.nextCodepoint = function ( position ) {
var codeUnit = this.read( position );
if ( unicodeJS.isLeadingSurrogate( codeUnit ) ) {
var nextCodeUnit = this.read( position + 1 );
if ( unicodeJS.isTrailingSurrogate( nextCodeUnit ) ) {
return codeUnit + nextCodeUnit;
}
}
return codeUnit;
};
/**
* Read unicode codepoint before the specified offset
*
* This is the same as the code unit (=Javascript character) at the previous
* offset, unless a valid surrogate pair ends at that offset.
*
* @param {number} position Position
* @return {string|null} Unicode codepoint, or null if out of bounds
*/
unicodeJS.TextString.prototype.prevCodepoint = function ( position ) {
var codeUnit = this.read( position - 1 );
if ( unicodeJS.isTrailingSurrogate( codeUnit ) ) {
var prevCodeUnit = this.read( position - 2 );
if ( unicodeJS.isLeadingSurrogate( prevCodeUnit ) ) {
return prevCodeUnit + codeUnit;
}
}
return codeUnit;
};
/**
* Check if the current offset is in the middle of a surrogate pair
*
* @param {number} position Position
* @return {boolean}
*/
unicodeJS.TextString.prototype.isMidSurrogate = function ( position ) {
return unicodeJS.isLeadingSurrogate( this.read( position - 1 ) ) &&
unicodeJS.isTrailingSurrogate( this.read( position ) );
};
/**
* Get as a plain string
*
* @return {string} Plain javascript string
*/
unicodeJS.TextString.prototype.toString = function () {
return this.text;
};
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