Module expression 

License expression parsing and manipulation.

This module provides a parser for ScanCode license expressions, supporting:

• ScanCode license keys (e.g., mit, gpl-2.0-plus, apache-2.0)
• SPDX operators: AND, OR, WITH (case-insensitive)
• Parenthetical grouping
• The LicenseRef-scancode-* format for non-SPDX licenses

The parser converts license expression strings into an AST (Abstract Syntax Tree) and provides functions for validation and simplification.

Enums

LicenseExpression

A parsed license expression represented as an AST.

ParseError

Error type for license expression parsing.

Functions

combine_expressions_and

Combine multiple license expressions with AND.

expression_to_string

Returns

licensing_contains

parse_expression

Parse a license expression string into a structured expression.

simplify_expression

Simplify a license expression by deduplicating license keys.