The Coding Language official browser Javascript interpreter and specs. Made in response to this r/ProgrammerHumor post.

As of now, the interpreter only works in browsers with ES6 support. Legacy Javascript support will come soon.

Hello world:

(Hello, world!) S

A fancier Hello world:

>div
  (height:100%;display:flex;justify-content:center;align-items:center)@style
(Hello, world!)>h1
  #h
  (color:red;font-family:"Comic Sans MS")@style
  (h.style.color='blue')@onmouseenter
  (h.style.color='red')@onmouseleave
*e

Quine:

(: a S S): a S S

Coding is essentially Underload optimized for HTML -- "stack-based HTML." As of now, the standard library pretty much consists of only the essential functions needed for Turing-completeness and basic markup; expansion will come with time.

Coding has 2 stacks, one for strings and another for HTML output. Parentheses push to the string stack; for example, (asdf) would push asdf to the string stack. Trailing parentheses are optional, but be sure to escape parentheses with \ when necessary.

(asdf)
(Hey (it's me!\))

The standard library has a function S that can push from the string stack to the output stack. In addition, there are several pseudo-functions:

• >: Pops top string stack element, wraps with a tag name, and pushes to output stack. The tag must match the regex [A-Za-z][-_A-Za-z0-9]*. Example: (asdf) >h1

• .: Adds a class to the top output stack element. The class must match the regex "-"?[_a-zA-Z]+[_a-zA-Z0-9-]*. Example: (asdf) >h1 .xyz

• #: Adds an ID to the top output stack element. The ID must match the regex [A-Za-z][-_A-Za-z0-9]*. Example: (asdf) >h1 #xyz

• @: Adds an attribute to the top output stack element using the popped top string stack element. The attribute name must match the regex [A-Za-z][-_A-Za-z0-9]*. Example: (asdf) >h1 (color:red)@style

Functions are anything matched by the regex [^ \n()""@#.]+.

You may need to whitespace-separate for parser clarity.

• ~: SWAP. Append e to the command to perform on the output stack.
• :: DUP. Append e to the command to perform on the output stack.
• !: DROP. Append e to the command to perform on the output stack.
• S: Push the top string stack element to the output stack in text form.
• Se: Push the HTML string form of the top output stack element to the string stack.
• *: Concatenate. Append e to perform on the output stack.
• a: Wrap parentheses around the top string stack element.
• ^: Evaluate the top string stack element.