Add Shell, Python and JavaScript highlighting (#795)

Co-authored-by: barkure <43804451+barkure@users.noreply.github.com>

Author: lhecker

assets/highlighting-tests/bash.sh

@@ -0,0 +1,117 @@
+// Comments
+// Single-line comment
+
+/*
+ * Multi-line
+ * comment
+ */
+
+// Numbers
+42;
+3.14;
+.5;
+1e10;
+1.5e-3;
+0xff;
+0xFF;
+0b1010;
+0o77;
+1_000_000;
+42n;
+
+// Constants
+true;
+false;
+null;
+undefined;
+NaN;
+Infinity;
+
+// Strings
+'single quotes with escape: \' \n \t \\';
+"double quotes with escape: \" \n \t \\";
+
+// Control flow keywords
+if (true) {
+} else if (false) {
+} else {
+}
+
+for (let i = 0; i < 10; i++) {
+  if (i === 5) continue;
+  if (i === 8) break;
+}
+
+while (false) { }
+do { } while (false);
+
+switch (42) {
+  case 1: break;
+  default: break;
+}
+
+try {
+  throw new Error("oops");
+} catch (e) {
+} finally {
+}
+
+debugger;
+
+// Template literals
+`template literal: ${1 + 2} and ${greet("world")}`;
+`multi
+line
+template`;
+
+// Other keywords (some are contextually reserved)
+var a = 1;
+let b = 2;
+const c = 3;
+
+function greet(name) {
+  return "Hello, " + name;
+}
+
+async function fetchData() {
+  const result = await fetch("/api");
+  return result;
+}
+
+function* gen() {
+  yield 1;
+  yield 2;
+}
+
+class Animal extends Object {
+  static count = 0;
+
+  constructor(name) {
+    super();
+    this.name = name;
+    Animal.count++;
+  }
+
+  speak() {
+    return `${this.name} speaks`;
+  }
+}
+
+const obj = { a: 1 };
+delete obj.a;
+typeof obj;
+void 0;
+"a" instanceof Object;
+"a" in obj;
+
+import { readFile } from "fs";
+export const PI = 3.14;
+for (const x of [1, 2]) { }
+for (const k in { a: 1 }) { }
+
+// Function calls
+console.log("hello");
+Math.max(1, 2);
+[1, 2, 3].map(x => x * 2);
+greet("world");
+parseInt("42");

assets/highlighting-tests/javascript.js

@@ -66,10 +66,21 @@ Reference: ![Logo][logo-ref]
 echo "Hello, world" | tr a-z A-Z
 ```
 
+```javascript
+export function greet(name) {
+  return `hello ${name}`;
+}
+```
+
 ```json
 {
   "name": "gfm-kitchen-sink",
   "private": true,
   "scripts": { "test": "echo ok" }
 }
 ```
+
+```python
+def greet(name: str) -> str:
+    return f"hello {name}"
+```

assets/highlighting-tests/markdown.md

@@ -0,0 +1,142 @@
+# Comments
+# Single-line comment
+
+# Numbers
+42
+3.14
+.5
+1e10
+1.5e-3
+0xff
+0xFF
+0b1010
+0o77
+1_000_000
+3.14j
+
+# Constants
+True
+False
+None
+
+# Strings
+'single quotes: \' \n \t \\'
+"double quotes: \" \n \t \\"
+
+# Control flow keywords
+if True:
+    pass
+elif False:
+    pass
+else:
+    pass
+
+for i in range(10):
+    if i == 5:
+        continue
+    if i == 8:
+        break
+
+while False:
+    pass
+
+match 42:
+    case 1:
+        pass
+    case _:
+        pass
+
+try:
+    raise ValueError("oops")
+except ValueError as e:
+    pass
+finally:
+    pass
+
+with open("/dev/null") as f:
+    pass
+
+return  # (only valid inside a function)
+
+# Triple-quoted strings
+"""
+Multi-line
+docstring (double quotes)
+"""
+
+'''
+Multi-line
+string (single quotes)
+'''
+
+# Prefixed strings (f, r, b)
+f"f-string: {1 + 2}"
+r"raw string: \n is literal"
+b"byte string"
+
+# Decorators
+@staticmethod
+def helper():
+    pass
+
+@property
+def name(self):
+    return self._name
+
+@custom_decorator
+def decorated():
+    pass
+
+# Other keywords (some are contextually reserved)
+import os
+from os import path
+import sys as system
+
+def greet(name):
+    return "Hello, " + name
+
+async def fetch_data():
+    result = await some_coroutine()
+    return result
+
+class Animal:
+    count = 0
+
+    def __init__(self, name):
+        self.name = name
+        Animal.count += 1
+
+    def speak(self):
+        return f"{self.name} speaks"
+
+class Dog(Animal):
+    pass
+
+lambda x: x + 1
+
+x = 1
+del x
+assert True
+not False
+True and False
+True or False
+1 is 1
+1 is not 2
+1 in [1, 2]
+
+global _g
+nonlocal  # (only valid inside nested function)
+
+def gen():
+    yield 1
+    yield from [2, 3]
+
+type Alias = int
+
+# Function calls
+print("hello")
+len([1, 2, 3])
+list(range(10))
+greet("world")
+int("42")
+"hello".upper()