| 1 | //! Typed incremental ModelContext / WorldState fragments. |
| 2 | //! |
| 3 | //! CodeWhale already assembles prompts most-static → most-volatile for prefix |
| 4 | //! caching (`prompts.rs`). This module adds the missing identity layer: each |
| 5 | //! volatile concern is a capped, marked fragment with `render_diff` so an |
| 6 | //! environment or agent-topology change does not rebuild unrelated material. |
| 7 | //! |
| 8 | //! The constitution / mode base stays outside WorldState and remains the |
| 9 | //! cache-stable prefix. WorldState owns only the mutable mid-session layers. |
| 10 | |
| 11 | mod fragment; |
| 12 | mod world_state; |
| 13 | |
| 14 | #[allow(unused_imports)] // public ModelContext surface for TUI-DOG-011 prompt cutover siblings |
| 15 | pub use fragment::{ |
| 16 | DEFAULT_FRAGMENT_MAX_BYTES, FragmentId, FragmentRender, FragmentRole, ModelContextFragment, |
| 17 | }; |
| 18 | #[allow(unused_imports)] // WorldStateDiff consumed once hosts call render_diff in production |
| 19 | pub use world_state::{WorldState, WorldStateDiff, WorldStateSnapshot}; |
| 20 | |
| 21 | #[cfg(test)] |
| 22 | mod tests { |
| 23 | use super::*; |
| 24 | |
| 25 | #[test] |
| 26 | fn unchanged_fragment_is_retained_not_reinjected() { |
| 27 | let mut state = WorldState::new(); |
| 28 | let first = ModelContextFragment::new( |
| 29 | FragmentId::Workspace, |
| 30 | FragmentRole::Workspace, |
| 31 | "repo: /tmp/demo\nbranch: main", |
| 32 | ); |
| 33 | let render = state.upsert(first.clone()); |
| 34 | assert!(matches!(render, FragmentRender::Updated { .. })); |
| 35 | |
| 36 | let again = ModelContextFragment::new( |
| 37 | FragmentId::Workspace, |
| 38 | FragmentRole::Workspace, |
| 39 | "repo: /tmp/demo\nbranch: main", |
| 40 | ); |
| 41 | let render = state.upsert(again); |
| 42 | assert_eq!( |
| 43 | render, |
| 44 | FragmentRender::Unchanged { |
| 45 | marker: FragmentId::Workspace.marker().to_string(), |
| 46 | content_hash: first.content_hash, |
| 47 | } |
| 48 | ); |
| 49 | |
| 50 | let diff = state.render_diff(None); |
| 51 | assert_eq!(diff.updated.len(), 1); |
| 52 | assert!(diff.retained.is_empty()); |
| 53 | |
| 54 | let previous = state.clone(); |
| 55 | let diff = state.render_diff(Some(&previous)); |
| 56 | assert!(diff.updated.is_empty()); |
| 57 | assert_eq!( |
| 58 | diff.retained, |
| 59 | vec![FragmentId::Workspace.marker().to_string()] |
| 60 | ); |
| 61 | } |
| 62 | |
| 63 | #[test] |
| 64 | fn hard_byte_cap_is_enforced_with_truncation_marker() { |
| 65 | let oversized = "x".repeat(DEFAULT_FRAGMENT_MAX_BYTES + 64); |
| 66 | let fragment = ModelContextFragment::new( |
| 67 | FragmentId::AgentTopology, |
| 68 | FragmentRole::AgentTopology, |
| 69 | oversized, |
| 70 | ); |
| 71 | assert!(fragment.content.len() <= DEFAULT_FRAGMENT_MAX_BYTES); |
| 72 | assert!( |
| 73 | fragment.content.contains("[…truncated:"), |
| 74 | "truncated marker must remain visible: {}", |
| 75 | fragment.content |
| 76 | ); |
| 77 | assert_eq!(fragment.marker, FragmentId::AgentTopology.marker()); |
| 78 | } |
| 79 | |
| 80 | #[test] |
| 81 | fn markers_are_stable_across_rebuilds() { |
| 82 | let a = ModelContextFragment::new( |
| 83 | FragmentId::Permissions, |
| 84 | FragmentRole::Permissions, |
| 85 | "approval: ask", |
| 86 | ); |
| 87 | let b = ModelContextFragment::new( |
| 88 | FragmentId::Permissions, |
| 89 | FragmentRole::Permissions, |
| 90 | "approval: auto", |
| 91 | ); |
| 92 | assert_eq!(a.marker, b.marker); |
| 93 | assert_eq!(a.marker, "<!-- cw:ctx:permissions -->"); |
| 94 | assert_ne!(a.content_hash, b.content_hash); |
| 95 | } |
| 96 | |
| 97 | #[test] |
| 98 | fn world_state_diff_updates_only_changed_fragments() { |
| 99 | let mut previous = WorldState::new(); |
| 100 | previous.upsert(ModelContextFragment::new( |
| 101 | FragmentId::Route, |
| 102 | FragmentRole::Route, |
| 103 | "model: deepseek-v4\nmode: agent", |
| 104 | )); |
| 105 | previous.upsert(ModelContextFragment::new( |
| 106 | FragmentId::TokenBudget, |
| 107 | FragmentRole::TokenBudget, |
| 108 | "budget: 100000\ncompaction: idle", |
| 109 | )); |
| 110 | |
| 111 | let mut next = previous.clone(); |
| 112 | next.upsert(ModelContextFragment::new( |
| 113 | FragmentId::TokenBudget, |
| 114 | FragmentRole::TokenBudget, |
| 115 | "budget: 100000\ncompaction: pending", |
| 116 | )); |
| 117 | |
| 118 | let diff = next.render_diff(Some(&previous)); |
| 119 | assert_eq!(diff.retained, vec![FragmentId::Route.marker().to_string()]); |
| 120 | assert_eq!(diff.updated.len(), 1); |
| 121 | assert_eq!(diff.updated[0].id, FragmentId::TokenBudget); |
| 122 | assert!(diff.updated[0].content.contains("compaction: pending")); |
| 123 | } |
| 124 | |
| 125 | #[test] |
| 126 | fn snapshot_renders_constitution_then_world_state_blocks() { |
| 127 | let mut state = WorldState::new(); |
| 128 | state.upsert(ModelContextFragment::new( |
| 129 | FragmentId::Workspace, |
| 130 | FragmentRole::Workspace, |
| 131 | "pwd: /ws", |
| 132 | )); |
| 133 | state.upsert(ModelContextFragment::new( |
| 134 | FragmentId::SkillsTools, |
| 135 | FragmentRole::SkillsTools, |
| 136 | "skills: 2 available", |
| 137 | )); |
| 138 | |
| 139 | let snapshot = WorldStateSnapshot { |
| 140 | constitution: "You are CodeWhale.".to_string(), |
| 141 | world_state: state, |
| 142 | }; |
| 143 | let blocks = snapshot.to_system_blocks(); |
| 144 | assert_eq!(blocks.len(), 3); |
| 145 | assert_eq!(blocks[0].text, "You are CodeWhale."); |
| 146 | assert!(blocks[1].text.starts_with(FragmentId::Workspace.marker())); |
| 147 | assert!(blocks[2].text.starts_with(FragmentId::SkillsTools.marker())); |
| 148 | |
| 149 | let text = snapshot.render_text(); |
| 150 | assert!(text.starts_with("You are CodeWhale.")); |
| 151 | assert!(text.contains(FragmentId::Workspace.marker())); |
| 152 | assert!(text.contains(FragmentId::SkillsTools.marker())); |
| 153 | } |
| 154 | } |
| 155 |