Source Files and Comments

LunarBasic source code is read one line at a time. Before parsing begins, blank lines and comments are removed so the parser can focus on real code.

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How Source Files Are Read

• Source is read line-by-line.
• Parsing works on logical source lines after blank lines and comments are removed.
• Error messages include the file name, line number, and column number.

Whitespace

• Whitespace between tokens is ignored.
• Blank lines are ignored.

This means you can space code out for readability without changing how it is parsed.

Apostrophe Comments

An apostrophe starts either a full-line comment or an inline comment.

Anything after the apostrophe on the same line is ignored.

Block Comments

Block comments start with Rem and end with End Rem.

• The match is case-insensitive.
• Leading and trailing whitespace are ignored when checking for Rem and End Rem.
• A line containing only Rem starts the block comment.
• A line containing only End Rem ends the block comment.
• Everything inside the block is ignored.
• If the file ends before End Rem appears, it is a syntax error.