Naiive first approach to enforce an ascii mode

Author: 0xricksanchez

packages/core/FuzzedDataProvider.ts

@@ -397,6 +397,27 @@ export class FuzzedDataProvider {
 		return result;
 	}
 
+	/**
+	 * Wrapping subtraction function that returns a number
+	 * @param char is a single character from a string represented as a number
+	 * @returns a number n with the constraint 0<= n <= 255
+	 */
+	wrappingSub(char: number): number {
+		return (char - 32 + 256) % 256;
+	}
+
+	/**
+	 * A simple conversion helper that yields the ASCII representaion of a character
+	 * @param char is a single character from a string represented as a number
+	 * @returns a 'string' from a single character that was represented by a number
+	 */
+	toAscii(char: number): string {
+		if (char < 32 || char > 126) {
+			char = (this.wrappingSub(char) % 95) + 32;
+		}
+		return String.fromCharCode(char);
+	}
+
 	/**
 	 * Helper function that converts the given string type into one that only
 	 * contains printable characters.
@@ -407,7 +428,7 @@ export class FuzzedDataProvider {
 		const chars = [...dirtyStr];
 		for (let i = 0; i < chars.length; i++) {
 			const c = chars[i];
-			chars[i] = new Char(c.charCodeAt(0) as CharNum).toAscii();
+			chars[i] = this.toAscii(c.charCodeAt(0));
 		}
 		return chars.join("");
 	}
@@ -657,92 +678,3 @@ export class FuzzedDataProvider {
 		return Math.ceil(numAvailableBytes / numBytesPerElement);
 	}
 }
-
-// prettier-ignore
-type CharStr = " " | "!" | '"' | "#" | "$" | "%" | "&" | "'" | "(" | ")" | "*" | "+" | "," | "-" | "." | "/"
-	| "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
-	| ":" | ";" | "<" | "=" | ">" | "?" | "@"
-	| "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z"
-	| "[" | "\\" | "]" | "^" | "_" | "`"
-	| "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z"
-	| "{" | "|" | "}" | "~";
-
-// prettier-ignore
-type CharNum = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15
-16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31;
-32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47;
-48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63;
-64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79;
-80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95;
-//prettier-ignore
-96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111
-//prettier-ignore
-112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127
-//prettier-ignore
-128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143
-//prettier-ignore
-144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159
-//prettier-ignore
-160 | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | 175
-//prettier-ignore
-176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191
-//prettier-ignore
-192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207
-//prettier-ignore
-208 | 209 | 210 | 211 | 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 | 221 | 222 | 223
-//prettier-ignore
-224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | 232 | 233 | 234 | 235 | 236 | 237 | 238 | 239
-//prettier-ignore
-240 | 241 | 242 | 243 | 244 | 245 | 246 | 247 | 248 | 249 | 250 | 251 | 252 | 253 | 254 | 255;
-
-class Char extends Uint8ClampedArray {
-	constructor(char: CharNum | CharStr | Char) {
-		super(1);
-		this.setValue(char);
-	}
-
-	get _value(): CharNum {
-		return this[0] as CharNum;
-	}
-
-	set _value(char: CharNum | CharStr | Char) {
-		if (char instanceof Char) {
-			this[0] = char._value;
-		} else if (typeof char === "number") {
-			this[0] = char;
-		} else if (typeof char === "string") {
-			this[0] = char.charCodeAt(0);
-		}
-	}
-
-	setValue(char: CharNum | CharStr | Char) {
-		this._value = char;
-	}
-
-	toString(): CharStr {
-		return String.fromCharCode(this._value) as CharStr;
-	}
-
-	toNumber(): CharNum {
-		return this._value;
-	}
-
-	[Symbol.toPrimitive](hint: string) {
-		if (hint === "number") {
-			return this.toNumber();
-		}
-		return this.toString();
-	}
-
-	wrappingSub(): this {
-		this._value = ((this._value - 32 + 256) % 256) as CharNum;
-		return this;
-	}
-
-	toAscii(): CharStr {
-		if (this._value < 32 || this._value > 126) {
-			this._value = ((this.wrappingSub()._value % 95) + 32) as CharNum;
-		}
-		return this.toString();
-	}
-}