Module data_refs 

Data reference expression parsing

This module handles parsing of generic data/DataFrame references:

• Simple data references: data[0], data[-1]
• Timeframe-specific references: data(5m)[0]
• DateTime-based references: data[@2024-01-01]
• Relative access: data[@today][-1]
• Index parsing and range expressions

Functions

parse_data_ref

Parse a data reference

parse_index_expr

Parse index expression (with optional timeframe)

parse_index_expr_general

Parse a general index expression (can be any expression, not just integers)

parse_optional_timeframe

Parse optional timeframe