haive.core.graph.node.composer.path_resolver

Path resolver for extracting values from objects using path notation.

This module provides path-based value extraction from objects, supporting simple field access initially, with progressive enhancement for complex paths.

Classes

PathResolver

Resolver for extracting values from objects using path notation.

Module Contents

class haive.core.graph.node.composer.path_resolver.PathResolver

Resolver for extracting values from objects using path notation.

This class handles path-based extraction from objects, supporting:

Phase 1: Simple field access (e.g., “messages”, “temperature”) Phase 2: Dot notation (e.g., “config.temperature”) Phase 2: Array access (e.g., “messages[0]”, “messages[-1]”) Phase 3: Advanced patterns (wildcards, method calls, etc.)

extract_value(obj, path, default=None)

Extract value from object using path notation.

Parameters:

• obj (Any) – Object to extract from (dict, Pydantic model, etc.)

• path (str) – Path string (e.g., “messages”, “config.temp”, “messages[0]”)

• default (Any) – Default value if path not found or None

Returns:

Extracted value or default

Return type:

Any

Examples

# Simple field access (Phase 1) resolver = PathResolver() state = {“messages”: [“hello”], “temp”: 0.7}

value = resolver.extract_value(state, “messages”) # Returns: [“hello”]

# Dot notation (Phase 2) value = resolver.extract_value(state, “config.temperature”) # Returns: 0.7

# Array access (Phase 2) value = resolver.extract_value(state, “messages[0]”) # Returns: “hello”