fix: harmonise TS and AS execution

ref #17

.prettierignore

@@ -0,0 +1,2 @@
+# prettier doesn't support decorators on functions :-(
+assembly/char.ts

assembly/char.ts

@@ -5,6 +5,7 @@ export const enum Char {
  FormFeed = 0x0c,
  CarriageReturn = 0x0d,
  LineFeed = 0x0a,
+ Space = 0x20,
  Dollar = 0x24, // "$"
  LeftParenthesis = 0x28,
  RightParenthesis = 0x29,
@@ -14,11 +15,13 @@ export const enum Char {
  Minus = 0x2d, // "-"
  Dot = 0x2e, // "."
  Zero = 0x30,
+ Nine = 0x39,
  Question = 0x3f, // "?"
  A = 0x41,
  D = 0x44,
  S = 0x53,
  W = 0x57,
+ Z = 0x5a,
  LeftSquareBracket = 0x5b, // "["
  Backslash = 0x5c, // "\"
  RightSquareBracket = 0x5d, // "]"
@@ -35,40 +38,58 @@ export const enum Char {
  v = 0x76,
  w = 0x77,
  x = 0x78,
+ z = 0x7a,
  LeftCurlyBrace = 0x7b /* { */,
  VerticalBar = 0x7c /* | */,
- RightCurlyBrace = 0x7d /* */,
+ RightCurlyBrace = 0x7d /* { */,
+ NonBreakingSpace = 0xa0,
+}
+
+// @ts-ignore 
+@inline
+function inRange(value: u32, from: u32, to: u32): bool {
+ if (ASC_TARGET == 1) {
+ // makes use of unsigned integer operations, making this
+ // approach a little faster when compiled to WASM
+ return value - from < (to - from + 1);
+ } else {
+ return value >= from && value <= to;
+ }
 }
 
 export function isDigit(code: u32): bool {
- return code - Char.Zero < 10;
+ return inRange(code, Char.Zero, Char.Nine);
 }
 
 export function isHexadecimalDigit(code: u32): bool {
- return isDigit(code) || code - Char.a < 6;
+ return isDigit(code) || inRange(code, Char.a, Char.f);
 }
 
 export function isLowercaseAlpha(code: u32): bool {
- return code - Char.a < 26;
+ return inRange(code, Char.a, Char.z);
 }
 
 export function isUppercaseAlpha(code: u32): bool {
- return code - Char.A < 26;
+ return inRange(code, Char.A, Char.Z);
 }
 
 export function isAlpha(code: u32): bool {
- return (code | 32) - Char.a < 26;
+ if (ASC_TARGET == 1) {
+ return (code | 32) - Char.a < 26;
+ } else {
+ return inRange(code, Char.a, Char.z) || inRange(code, Char.A, Char.Z);
+ }
 }
 
 export function isWhitespace(code: u32): bool {
- if (code < 0x1680) {
- // < <LS> (1)
- // <SP>, <TAB>, <LF>, <VT>, <FF>, <CR> and <NBSP>
- // @ts-ignore: cast
- return ((code | 0x80) == 0xa0) | (code - 0x09 <= 0x0d - 0x09);
- }
- if (code - 0x2000 <= 0x200a - 0x2000) return true;
  switch (code) {
+ case Char.Space:
+ case Char.HorizontalTab:
+ case Char.VerticalTab:
+ case Char.FormFeed:
+ case Char.LineFeed:
+ case Char.CarriageReturn:
+ case Char.NonBreakingSpace:
  case 0x1680: // <LS> (1)
  case 0x2028: // <LS> (2)
  case 0x2029: // <PS>
@@ -78,5 +99,8 @@ export function isWhitespace(code: u32): bool {
  case 0xfeff:
  return true; // <ZWNBSP>
  }
+ if (inRange(code, 0x2000, 0x200a)) {
+ return true;
+ }
  return false;
 }