Syntax

ENG uses structured English. It is English-looking syntax with fixed parser templates, not unrestricted natural-language input.

Statements

Examples:

Let x be 5.
Set x to 10.
Print x.

Each statement ends with a period.

Blocks

Control-flow and function blocks use End.:

If x is greater than 5, then
    Print "large".
End.

Comments

A # begins a line comment:

# This is a comment.
Let x be 5. # This comment follows a statement.

Case

Keywords are recognized case-insensitively, so keyword casing does not change their meaning.

Identifiers are stored as identifiers by the lexer and should be kept consistently named for readability.

Strings

Strings are enclosed in double quotes:

Let message be "Hello".

A newline inside a string is rejected as an unterminated string.

Punctuation

• . terminates statements.
• , is required between an If condition and then, and can separate function arguments.
• " starts and ends a string.

What is not valid

ENG does not accept arbitrary prose:

Please print the value.

The parser expects the known Print expression. template instead.