meaningfool

Activity Log - 2025-11-27

Analysis

  • Evolved the Graph Layout Algorithm Through Iterative Specification:

    • Started with a Multi-Pass Anchoring strategy (3 passes: anchor to Output, Input, then Islands)
    • Simplified to Single Pass Sink-Anchored strategy after recognizing the complexity was unnecessary
    • Key insight: All valid flows eventually lead to a “Sink” (Output or Dead-end Step), so traversing upstream from sinks handles the entire graph in one pass
    • Added critical refinements:
      • Early Exit for Input-Only graphs (no sinks to traverse, assign all to Layer 0)
      • Ignored Edges for Input->Input and Output->Output (cannot be made valid by reversal, add no value to hierarchy)
      • Real-time Max Path Tracking during traversal to determine final Input layer
      • Strict Input Separation: if MaxLayer is occupied by non-Input, force Inputs to MaxLayer+1

  • Defined Comprehensive Test Cases for Invalid Graphs (Slice 2):

    • Expanded from 2 test cases to 10 distinct scenarios covering edge cases:
      • Invalid Source Direction (backward Output edge)
      • Missing Output (Input Chain) / Missing Input (Output Chain)
      • Isolated Chain (no Input, no Output - “Islands”)
      • Mixed scenarios: Valid Chain + Missing Output/Input/Isolated Chain
      • Input-Input and Output-Output connections
      • Input-Only Graph (degenerate case)
    • Each test case now has explicit, testable assertions for both layer indices and visual coordinates

  • Established Two-Layer Testing Strategy:

    • Layer 1 (Algorithm Logic): Use data-layer attribute on nodes for E2E tests to verify computed layer indices
    • Layer 2 (Visual Rendering): Assert relative X-coordinates to verify correct rendering
    • Benefits: Decouples logic verification from pixel-perfect rendering; failures indicate which layer failed

Raw Commits

Repository: meaningfool/lineage-graph-app Commit: [d3a71e1356cbd8ac56e8389df796118522e6570f] docs(graph-layout): Refine algorithm with Early Exit, Ignored Edges, and Cycle Detection

Repository: meaningfool/lineage-graph-app Commit: [c7bf8ee38ca9f1f3c543bf9528c30f8bfddd54ad] docs(graph-layout): Update algorithm strategy to Single Pass Sink-Anchored

Repository: meaningfool/lineage-graph-app Commit: [74530bb9b0bd74e54b5efcadd42764df5578d1ca] feat(graph-layout): Implement Slice 1 (Basic Flows) and document Slice 2 strategy

Repository: meaningfool/lineage-graph-app Commit: [aa546a2f0ec97042dc31d14f4fb1a059f4893ba0] docs: add data-layer attribute requirement for two-layer E2E testing strategy

Repository: meaningfool/lineage-graph-app Commit: [dea49e8515796de36ed8226f4b8eb0cdf2b23b0f] docs: add explicit testable assertions for all test cases

Repository: meaningfool/lineage-graph-app Commit: [9d1d843e18ddadca6615c93f5f19faad4be86bb8] docs: fix orphaned chain layers (must have dedicated INPUT layer) and add convergent path to cycle test