nonempty

Written as nonempty(argnum flags):options in a transform expression.

Minimum arguments	1
Maximum arguments	no limit
Default arguments	1
Argument modes	SINGLE_PRIMITIVE, SINGLE_ARRAY, SINGLE_DICT, MULTIPLE_ARRAYS, MULTIPLE_DICTS

Documentation

Validate that input arguments are non-empty.

This transform checks that none of the provided arguments are empty strings, None, or empty collections. If any empty value is found, it raises NonEmptyAssertError.

Validation Rules:

• Strings: Must have length > 0 (whitespace-only counts as empty)
• Collections (list, dict, set, tuple): Must have len > 0
• None: Always considered empty
• Other types: Considered non-empty if not None

Notes:

• Accepts unlimited number of arguments (_max_arg_num = -1)
• Returns original arguments unchanged (meaning output spread is enabled as default) if validation passes
• Raises NonEmptyAssertError immediately on first empty value found
• Useful for input validation in transformation pipelines
• Error message includes all arguments for debugging

Flags

Flag	Letter
spread_input	s
spread_output	S
noncaptive_input	I
arg_num_flexible	f

Examples

Basic validation - passes

Input args: ["hello"]
Transforms: "nonempty:"
Output: ["hello"]

Basic validation - errors

Input args: []
Transforms: "nonempty:"
Output: N/A
Error: "Fails non-empty assert"

Multiple arguments - passes

Input args: ["hello","world"]
Transforms: "nonempty(*):"
Output: ["hello","world"]

Multiple arguments - errors

Input args: ["hello",""]
Transforms: "nonempty(*):"
Output: N/A
Error: "Fails non-empty assert"

With collections - passes

Input args: [[1,2,3]]
Transforms: "nonempty:"
Output: [[1,2,3]]

With collections - errors

Input args: []
Transforms: "nonempty:"
Output: N/A
Error: "Fails non-empty assert"