Language overview

This is a version-specific guide to Scarp v0.0.5-alpha.1, not a promise of a frozen language specification. Source files conventionally use .srp and must contain UTF-8 text.

A short example

pure funcra double(value: integer) -> integer {
    return value * 2;
}
var n = 3;
while n < 6 {
    print(double(n));
    n += 1;
}

Expected output:

6
8
10

The example uses typed function parameters and return values, an immutable function body, a mutable local binding, and a boolean while condition.

Source rules

• Identifiers consist of ASCII letters, digits, and underscores, and may not start with a digit.
• Identifiers are case-sensitive. Single-line comments start with //; block comments are not supported.
• Whitespace is flexible; Unicode content is supported in comments and string literals.
• Strings use double quotes. Supported escapes are \\, \", \n, \t, and \r.
• Most declarations, assignments, calls, output, and control statements require a ;. Braced blocks themselves do not.
• Lexical scopes are established with { and }; declarations do not become visible before their initializer.

Reference map

The following chapters cover variables, types, operators, control flow, functions, modules, output, and memory. The compiler implements additional numerical operations; refer to vectors and tiles.

Verified against: compiler language reference, current tests.