75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
// Single characters
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(function(baselib) {
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var exports = {};
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baselib.chars = exports;
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// Chars
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// Char: string -> Char
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Char = function(val){
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this.val = val;
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};
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// The characters less than 256 must be eq?, according to the
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// documentation:
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// http://docs.racket-lang.org/reference/characters.html
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var _CharCache = {};
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for (var i = 0; i < 256; i++) {
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_CharCache[String.fromCharCode(i)] = new Char(String.fromCharCode(i));
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}
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// makeInstance: 1-character string -> Char
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Char.makeInstance = function(val){
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if (_CharCache[val]) {
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return _CharCache[val];
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}
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return new Char(val);
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};
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Char.prototype.toString = function(cache) {
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var code = this.val.charCodeAt(0);
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var returnVal;
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switch (code) {
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case 0: returnVal = '#\\nul'; break;
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case 8: returnVal = '#\\backspace'; break;
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case 9: returnVal = '#\\tab'; break;
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case 10: returnVal = '#\\newline'; break;
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case 11: returnVal = '#\\vtab'; break;
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case 12: returnVal = '#\\page'; break;
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case 13: returnVal = '#\\return'; break;
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case 20: returnVal = '#\\space'; break;
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case 127: returnVal = '#\\rubout'; break;
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default: if (code >= 32 && code <= 126) {
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returnVal = ("#\\" + this.val);
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}
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else {
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var numStr = code.toString(16).toUpperCase();
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while (numStr.length < 4) {
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numStr = '0' + numStr;
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}
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returnVal = ('#\\u' + numStr);
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}
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break;
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}
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return returnVal;
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};
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Char.prototype.toWrittenString = Char.prototype.toString;
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Char.prototype.toDisplayedString = function (cache) {
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return this.val;
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};
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Char.prototype.getValue = function() {
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return this.val;
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};
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Char.prototype.equals = function(other, aUnionFind){
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return other instanceof Char && this.val == other.val;
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};
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exports.Char = Char;
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})(this['plt'].baselib); |