| 1 | use std::collections::BTreeMap; |
| 2 | |
| 3 | use serde::de::DeserializeOwned; |
| 4 | use serde::{Deserialize, Serialize}; |
| 5 | use thiserror::Error; |
| 6 | |
| 7 | use crate::{AgentType, ModelPolicy, WorkflowUsage}; |
| 8 | |
| 9 | #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)] |
| 10 | #[serde(rename_all = "snake_case")] |
| 11 | pub enum ModelRole { |
| 12 | Planner, |
| 13 | LeafReasoner, |
| 14 | Implementer, |
| 15 | Reviewer, |
| 16 | Teacher, |
| 17 | Student, |
| 18 | JsonExtractor, |
| 19 | } |
| 20 | |
| 21 | impl From<AgentType> for ModelRole { |
| 22 | fn from(agent_type: AgentType) -> Self { |
| 23 | match agent_type { |
| 24 | AgentType::General | AgentType::Explore => Self::LeafReasoner, |
| 25 | AgentType::Plan => Self::Planner, |
| 26 | AgentType::Review | AgentType::Verifier => Self::Reviewer, |
| 27 | AgentType::Implementer => Self::Implementer, |
| 28 | } |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)] |
| 33 | pub struct ModelCapabilities { |
| 34 | #[serde(default)] |
| 35 | pub tool_calls: bool, |
| 36 | #[serde(default)] |
| 37 | pub json_mode: bool, |
| 38 | #[serde(default)] |
| 39 | pub prompt_cache: bool, |
| 40 | #[serde(default)] |
| 41 | pub large_context: bool, |
| 42 | #[serde(default)] |
| 43 | pub streaming: bool, |
| 44 | } |
| 45 | |
| 46 | impl ModelCapabilities { |
| 47 | #[must_use] |
| 48 | pub fn satisfies(self, required: Self) -> bool { |
| 49 | (!required.tool_calls || self.tool_calls) |
| 50 | && (!required.json_mode || self.json_mode) |
| 51 | && (!required.prompt_cache || self.prompt_cache) |
| 52 | && (!required.large_context || self.large_context) |
| 53 | && (!required.streaming || self.streaming) |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] |
| 58 | pub struct ProviderModel { |
| 59 | pub provider: String, |
| 60 | pub model: String, |
| 61 | #[serde(default)] |
| 62 | pub capabilities: ModelCapabilities, |
| 63 | } |
| 64 | |
| 65 | #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] |
| 66 | pub struct ResolvedModel { |
| 67 | pub role: ModelRole, |
| 68 | pub provider: String, |
| 69 | pub model: String, |
| 70 | pub capabilities: ModelCapabilities, |
| 71 | pub source: ModelSelectionSource, |
| 72 | } |
| 73 | |
| 74 | #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)] |
| 75 | #[serde(rename_all = "snake_case")] |
| 76 | pub enum ModelSelectionSource { |
| 77 | Primary, |
| 78 | Fallback, |
| 79 | RoleDefault, |
| 80 | } |
| 81 | |
| 82 | #[derive(Debug, Clone, Default)] |
| 83 | pub struct ProviderRegistry { |
| 84 | models: BTreeMap<String, ProviderModel>, |
| 85 | role_policies: BTreeMap<ModelRole, ModelPolicy>, |
| 86 | } |
| 87 | |
| 88 | impl ProviderRegistry { |
| 89 | pub fn new() -> Self { |
| 90 | Self::default() |
| 91 | } |
| 92 | |
| 93 | pub fn with_model(mut self, model: ProviderModel) -> Self { |
| 94 | self.insert_model(model); |
| 95 | self |
| 96 | } |
| 97 | |
| 98 | pub fn with_role_policy(mut self, role: ModelRole, policy: ModelPolicy) -> Self { |
| 99 | self.role_policies.insert(role, policy); |
| 100 | self |
| 101 | } |
| 102 | |
| 103 | pub fn insert_model(&mut self, model: ProviderModel) { |
| 104 | self.models |
| 105 | .insert(model_key(&model.provider, &model.model), model); |
| 106 | } |
| 107 | |
| 108 | pub fn resolve_role( |
| 109 | &self, |
| 110 | role: ModelRole, |
| 111 | policy: Option<&ModelPolicy>, |
| 112 | required: ModelCapabilities, |
| 113 | ) -> Result<ResolvedModel, ModelPolicyError> { |
| 114 | let policy = match policy { |
| 115 | Some(policy) => (policy, ModelSelectionSource::Primary), |
| 116 | None => ( |
| 117 | self.role_policies |
| 118 | .get(&role) |
| 119 | .ok_or(ModelPolicyError::MissingPolicy { role })?, |
| 120 | ModelSelectionSource::RoleDefault, |
| 121 | ), |
| 122 | }; |
| 123 | self.resolve_policy(role, policy.0, policy.1, required) |
| 124 | } |
| 125 | |
| 126 | fn resolve_policy( |
| 127 | &self, |
| 128 | role: ModelRole, |
| 129 | policy: &ModelPolicy, |
| 130 | primary_source: ModelSelectionSource, |
| 131 | required: ModelCapabilities, |
| 132 | ) -> Result<ResolvedModel, ModelPolicyError> { |
| 133 | let candidates = model_candidates(policy)?; |
| 134 | let mut rejected = Vec::new(); |
| 135 | for (index, candidate) in candidates.iter().enumerate() { |
| 136 | let source = if index == 0 { |
| 137 | primary_source |
| 138 | } else { |
| 139 | ModelSelectionSource::Fallback |
| 140 | }; |
| 141 | let Some(model) = self |
| 142 | .models |
| 143 | .get(&model_key(&candidate.provider, &candidate.model)) |
| 144 | else { |
| 145 | rejected.push(format!( |
| 146 | "{}/{}: unknown", |
| 147 | candidate.provider, candidate.model |
| 148 | )); |
| 149 | continue; |
| 150 | }; |
| 151 | if model.capabilities.satisfies(required) { |
| 152 | return Ok(ResolvedModel { |
| 153 | role, |
| 154 | provider: model.provider.clone(), |
| 155 | model: model.model.clone(), |
| 156 | capabilities: model.capabilities, |
| 157 | source, |
| 158 | }); |
| 159 | } |
| 160 | rejected.push(format!( |
| 161 | "{}/{}: missing required capabilities", |
| 162 | model.provider, model.model |
| 163 | )); |
| 164 | } |
| 165 | Err(ModelPolicyError::NoCapableModel { role, rejected }) |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] |
| 170 | pub struct CompletionRequest { |
| 171 | pub role: ModelRole, |
| 172 | pub prompt: String, |
| 173 | #[serde(default)] |
| 174 | pub require_json: bool, |
| 175 | #[serde(default)] |
| 176 | pub model_policy: ModelPolicy, |
| 177 | } |
| 178 | |
| 179 | #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] |
| 180 | pub struct CompletionResponse { |
| 181 | pub text: String, |
| 182 | #[serde(default)] |
| 183 | pub usage: WorkflowUsage, |
| 184 | } |
| 185 | |
| 186 | pub trait ModelProvider { |
| 187 | fn provider(&self) -> &str; |
| 188 | fn model(&self) -> &str; |
| 189 | fn capabilities(&self) -> ModelCapabilities; |
| 190 | fn complete( |
| 191 | &self, |
| 192 | request: &CompletionRequest, |
| 193 | ) -> Result<CompletionResponse, ModelProviderError>; |
| 194 | } |
| 195 | |
| 196 | #[derive(Debug, Clone)] |
| 197 | pub struct MockModelProvider { |
| 198 | provider: String, |
| 199 | model: String, |
| 200 | capabilities: ModelCapabilities, |
| 201 | response: CompletionResponse, |
| 202 | } |
| 203 | |
| 204 | impl MockModelProvider { |
| 205 | pub fn new( |
| 206 | provider: impl Into<String>, |
| 207 | model: impl Into<String>, |
| 208 | capabilities: ModelCapabilities, |
| 209 | response: impl Into<String>, |
| 210 | ) -> Self { |
| 211 | Self { |
| 212 | provider: provider.into(), |
| 213 | model: model.into(), |
| 214 | capabilities, |
| 215 | response: CompletionResponse { |
| 216 | text: response.into(), |
| 217 | usage: WorkflowUsage::default(), |
| 218 | }, |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | impl ModelProvider for MockModelProvider { |
| 224 | fn provider(&self) -> &str { |
| 225 | &self.provider |
| 226 | } |
| 227 | |
| 228 | fn model(&self) -> &str { |
| 229 | &self.model |
| 230 | } |
| 231 | |
| 232 | fn capabilities(&self) -> ModelCapabilities { |
| 233 | self.capabilities |
| 234 | } |
| 235 | |
| 236 | fn complete( |
| 237 | &self, |
| 238 | _request: &CompletionRequest, |
| 239 | ) -> Result<CompletionResponse, ModelProviderError> { |
| 240 | Ok(self.response.clone()) |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | #[derive(Debug, Clone, PartialEq, Eq, Error)] |
| 245 | pub enum ModelPolicyError { |
| 246 | #[error("no model policy configured for role `{role:?}`")] |
| 247 | MissingPolicy { role: ModelRole }, |
| 248 | #[error("model policy must include a model for role resolution")] |
| 249 | MissingModel, |
| 250 | #[error("fallback model `{model}` requires a provider when the primary policy has none")] |
| 251 | MissingFallbackProvider { model: String }, |
| 252 | #[error("no configured model satisfies role `{role:?}` requirements: {rejected:?}")] |
| 253 | NoCapableModel { |
| 254 | role: ModelRole, |
| 255 | rejected: Vec<String>, |
| 256 | }, |
| 257 | } |
| 258 | |
| 259 | #[derive(Debug, Clone, PartialEq, Eq, Error)] |
| 260 | pub enum ModelProviderError { |
| 261 | #[error("model provider `{provider}/{model}` failed: {reason}")] |
| 262 | Failed { |
| 263 | provider: String, |
| 264 | model: String, |
| 265 | reason: String, |
| 266 | }, |
| 267 | } |
| 268 | |
| 269 | #[derive(Debug, Clone, PartialEq, Eq, Error)] |
| 270 | pub enum JsonRepairError { |
| 271 | #[error("json parse failed before and after one repair pass: {reason}")] |
| 272 | Parse { reason: String }, |
| 273 | } |
| 274 | |
| 275 | pub fn parse_json_with_repair<T: DeserializeOwned>(raw: &str) -> Result<T, JsonRepairError> { |
| 276 | match serde_json::from_str(raw) { |
| 277 | Ok(parsed) => Ok(parsed), |
| 278 | Err(first) => { |
| 279 | let repaired = repair_json_text_once(raw); |
| 280 | serde_json::from_str(&repaired).map_err(|second| JsonRepairError::Parse { |
| 281 | reason: format!("{first}; repair failed: {second}"), |
| 282 | }) |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | pub fn repair_json_text_once(raw: &str) -> String { |
| 288 | let trimmed = raw.trim(); |
| 289 | let without_fence = trimmed |
| 290 | .strip_prefix("```json") |
| 291 | .or_else(|| trimmed.strip_prefix("```")) |
| 292 | .and_then(|value| value.strip_suffix("```")) |
| 293 | .map(str::trim) |
| 294 | .unwrap_or(trimmed); |
| 295 | |
| 296 | first_valid_json_payload(without_fence) |
| 297 | .unwrap_or(without_fence) |
| 298 | .to_string() |
| 299 | } |
| 300 | |
| 301 | #[derive(Debug, Clone, PartialEq, Eq)] |
| 302 | struct ModelCandidate { |
| 303 | provider: String, |
| 304 | model: String, |
| 305 | } |
| 306 | |
| 307 | fn model_candidates(policy: &ModelPolicy) -> Result<Vec<ModelCandidate>, ModelPolicyError> { |
| 308 | let mut candidates = Vec::new(); |
| 309 | let Some(primary_model) = policy.model.as_ref() else { |
| 310 | return Err(ModelPolicyError::MissingModel); |
| 311 | }; |
| 312 | candidates.push(candidate_from_model( |
| 313 | policy.provider.as_deref(), |
| 314 | primary_model, |
| 315 | )?); |
| 316 | for fallback in &policy.fallback_models { |
| 317 | candidates.push(candidate_from_model(policy.provider.as_deref(), fallback)?); |
| 318 | } |
| 319 | Ok(candidates) |
| 320 | } |
| 321 | |
| 322 | fn candidate_from_model( |
| 323 | default_provider: Option<&str>, |
| 324 | model: &str, |
| 325 | ) -> Result<ModelCandidate, ModelPolicyError> { |
| 326 | if let Some((provider, model)) = model.split_once('/') { |
| 327 | return Ok(ModelCandidate { |
| 328 | provider: provider.to_string(), |
| 329 | model: model.to_string(), |
| 330 | }); |
| 331 | } |
| 332 | let Some(provider) = default_provider else { |
| 333 | return Err(ModelPolicyError::MissingFallbackProvider { |
| 334 | model: model.to_string(), |
| 335 | }); |
| 336 | }; |
| 337 | Ok(ModelCandidate { |
| 338 | provider: provider.to_string(), |
| 339 | model: model.to_string(), |
| 340 | }) |
| 341 | } |
| 342 | |
| 343 | fn model_key(provider: &str, model: &str) -> String { |
| 344 | format!("{provider}/{model}") |
| 345 | } |
| 346 | |
| 347 | // Repair scans untrusted model text once per possible container start. Keep the |
| 348 | // fallback bounded when malformed output contains a long delimiter flood. |
| 349 | const JSON_REPAIR_CANDIDATE_LIMIT: usize = 64; |
| 350 | |
| 351 | fn first_valid_json_payload(raw: &str) -> Option<&str> { |
| 352 | let mut attempted = 0; |
| 353 | for (start, open) in raw.char_indices() { |
| 354 | if !matches!(open, '{' | '[') { |
| 355 | continue; |
| 356 | } |
| 357 | attempted += 1; |
| 358 | if attempted > JSON_REPAIR_CANDIDATE_LIMIT { |
| 359 | break; |
| 360 | } |
| 361 | |
| 362 | let Some(candidate) = balanced_json_payload(&raw[start..]) else { |
| 363 | continue; |
| 364 | }; |
| 365 | if serde_json::from_str::<serde_json::Value>(candidate).is_ok() { |
| 366 | return Some(candidate); |
| 367 | } |
| 368 | } |
| 369 | None |
| 370 | } |
| 371 | |
| 372 | fn balanced_json_payload(raw: &str) -> Option<&str> { |
| 373 | let mut stack = Vec::new(); |
| 374 | let mut in_string = false; |
| 375 | let mut escaped = false; |
| 376 | |
| 377 | for (offset, character) in raw.char_indices() { |
| 378 | if in_string { |
| 379 | if escaped { |
| 380 | escaped = false; |
| 381 | } else { |
| 382 | match character { |
| 383 | '\\' => escaped = true, |
| 384 | '"' => in_string = false, |
| 385 | _ => {} |
| 386 | } |
| 387 | } |
| 388 | continue; |
| 389 | } |
| 390 | |
| 391 | match character { |
| 392 | '"' => in_string = true, |
| 393 | '{' | '[' => stack.push(character), |
| 394 | '}' | ']' => { |
| 395 | let expected_open = if character == '}' { '{' } else { '[' }; |
| 396 | if stack.pop() != Some(expected_open) { |
| 397 | return None; |
| 398 | } |
| 399 | if stack.is_empty() { |
| 400 | return Some(&raw[..offset + character.len_utf8()]); |
| 401 | } |
| 402 | } |
| 403 | _ => {} |
| 404 | } |
| 405 | } |
| 406 | None |
| 407 | } |
| 408 | |
| 409 | #[cfg(test)] |
| 410 | mod tests { |
| 411 | use super::*; |
| 412 | |
| 413 | fn model(provider: &str, model: &str, capabilities: ModelCapabilities) -> ProviderModel { |
| 414 | ProviderModel { |
| 415 | provider: provider.to_string(), |
| 416 | model: model.to_string(), |
| 417 | capabilities, |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | #[test] |
| 422 | fn provider_capability_fallback() { |
| 423 | let registry = ProviderRegistry::new() |
| 424 | .with_model(model("mock", "plain", ModelCapabilities::default())) |
| 425 | .with_model(model( |
| 426 | "mock", |
| 427 | "json", |
| 428 | ModelCapabilities { |
| 429 | json_mode: true, |
| 430 | ..ModelCapabilities::default() |
| 431 | }, |
| 432 | )); |
| 433 | let policy = ModelPolicy { |
| 434 | provider: Some("mock".to_string()), |
| 435 | model: Some("plain".to_string()), |
| 436 | fallback_models: vec!["json".to_string()], |
| 437 | }; |
| 438 | |
| 439 | let resolved = registry |
| 440 | .resolve_role( |
| 441 | ModelRole::JsonExtractor, |
| 442 | Some(&policy), |
| 443 | ModelCapabilities { |
| 444 | json_mode: true, |
| 445 | ..ModelCapabilities::default() |
| 446 | }, |
| 447 | ) |
| 448 | .expect("fallback json model should satisfy the role"); |
| 449 | |
| 450 | assert_eq!(resolved.model, "json"); |
| 451 | assert_eq!(resolved.source, ModelSelectionSource::Fallback); |
| 452 | } |
| 453 | |
| 454 | #[test] |
| 455 | fn role_default_policy_resolves_model() { |
| 456 | let registry = ProviderRegistry::new() |
| 457 | .with_model(model( |
| 458 | "mock", |
| 459 | "planner", |
| 460 | ModelCapabilities { |
| 461 | large_context: true, |
| 462 | ..ModelCapabilities::default() |
| 463 | }, |
| 464 | )) |
| 465 | .with_role_policy( |
| 466 | ModelRole::Planner, |
| 467 | ModelPolicy { |
| 468 | provider: Some("mock".to_string()), |
| 469 | model: Some("planner".to_string()), |
| 470 | fallback_models: Vec::new(), |
| 471 | }, |
| 472 | ); |
| 473 | |
| 474 | let resolved = registry |
| 475 | .resolve_role( |
| 476 | ModelRole::Planner, |
| 477 | None, |
| 478 | ModelCapabilities { |
| 479 | large_context: true, |
| 480 | ..ModelCapabilities::default() |
| 481 | }, |
| 482 | ) |
| 483 | .expect("role default should resolve"); |
| 484 | |
| 485 | assert_eq!(resolved.role, ModelRole::Planner); |
| 486 | assert_eq!(resolved.source, ModelSelectionSource::RoleDefault); |
| 487 | } |
| 488 | |
| 489 | #[test] |
| 490 | fn agent_type_maps_to_model_role() { |
| 491 | assert_eq!(ModelRole::from(AgentType::Plan), ModelRole::Planner); |
| 492 | assert_eq!( |
| 493 | ModelRole::from(AgentType::Implementer), |
| 494 | ModelRole::Implementer |
| 495 | ); |
| 496 | assert_eq!(ModelRole::from(AgentType::Verifier), ModelRole::Reviewer); |
| 497 | } |
| 498 | |
| 499 | #[test] |
| 500 | fn json_repair_fallback() { |
| 501 | #[derive(Debug, Deserialize, PartialEq, Eq)] |
| 502 | struct Payload { |
| 503 | answer: String, |
| 504 | } |
| 505 | |
| 506 | let parsed: Payload = parse_json_with_repair( |
| 507 | r#"Here is the JSON: |
| 508 | ```json |
| 509 | {"answer":"ok"} |
| 510 | ``` |
| 511 | "#, |
| 512 | ) |
| 513 | .expect("repair should extract fenced JSON"); |
| 514 | |
| 515 | assert_eq!( |
| 516 | parsed, |
| 517 | Payload { |
| 518 | answer: "ok".to_string() |
| 519 | } |
| 520 | ); |
| 521 | } |
| 522 | |
| 523 | #[test] |
| 524 | fn json_repair_fallback_fails_closed() { |
| 525 | let err = parse_json_with_repair::<serde_json::Value>("not json") |
| 526 | .expect_err("non-json text should fail closed"); |
| 527 | |
| 528 | assert!(matches!(err, JsonRepairError::Parse { .. })); |
| 529 | } |
| 530 | |
| 531 | #[test] |
| 532 | fn mock_provider_returns_configured_response() { |
| 533 | let provider = MockModelProvider::new( |
| 534 | "mock", |
| 535 | "fast", |
| 536 | ModelCapabilities::default(), |
| 537 | "mock response", |
| 538 | ); |
| 539 | let request = CompletionRequest { |
| 540 | role: ModelRole::LeafReasoner, |
| 541 | prompt: "say something".to_string(), |
| 542 | require_json: false, |
| 543 | model_policy: ModelPolicy::default(), |
| 544 | }; |
| 545 | |
| 546 | let response = provider.complete(&request).expect("mock should respond"); |
| 547 | |
| 548 | assert_eq!(provider.provider(), "mock"); |
| 549 | assert_eq!(provider.model(), "fast"); |
| 550 | assert_eq!(response.text, "mock response"); |
| 551 | } |
| 552 | |
| 553 | #[test] |
| 554 | fn repair_json_text_once_extracts_supported_payloads() { |
| 555 | // Plain JSON object |
| 556 | assert_eq!( |
| 557 | repair_json_text_once(r#"{"key": "value"}"#), |
| 558 | r#"{"key": "value"}"# |
| 559 | ); |
| 560 | |
| 561 | // Plain JSON array |
| 562 | assert_eq!(repair_json_text_once(r#"[1, 2, 3]"#), r#"[1, 2, 3]"#); |
| 563 | |
| 564 | // Markdown fenced JSON object |
| 565 | assert_eq!( |
| 566 | repair_json_text_once("```json\n{\"key\": \"value\"}\n```"), |
| 567 | r#"{"key": "value"}"# |
| 568 | ); |
| 569 | |
| 570 | // Markdown fenced JSON array |
| 571 | assert_eq!( |
| 572 | repair_json_text_once("```json\n[1, 2, 3]\n```"), |
| 573 | r#"[1, 2, 3]"# |
| 574 | ); |
| 575 | |
| 576 | // Generic markdown fence |
| 577 | assert_eq!( |
| 578 | repair_json_text_once("```\n{\"key\": \"value\"}\n```"), |
| 579 | r#"{"key": "value"}"# |
| 580 | ); |
| 581 | |
| 582 | // JSON object embedded in text |
| 583 | assert_eq!( |
| 584 | repair_json_text_once("Here is the JSON:\n\n{\"key\": \"value\"}\n\nHope this helps!"), |
| 585 | r#"{"key": "value"}"# |
| 586 | ); |
| 587 | |
| 588 | // JSON array embedded in text |
| 589 | assert_eq!( |
| 590 | repair_json_text_once("Some text before [1, 2, 3] and some text after"), |
| 591 | r#"[1, 2, 3]"# |
| 592 | ); |
| 593 | |
| 594 | // Nested structures (object containing array) |
| 595 | assert_eq!( |
| 596 | repair_json_text_once(r#"{"key": [1, 2, 3]}"#), |
| 597 | r#"{"key": [1, 2, 3]}"# |
| 598 | ); |
| 599 | |
| 600 | // Nested structures (array containing object) |
| 601 | assert_eq!( |
| 602 | repair_json_text_once(r#"[{"key": "value"}]"#), |
| 603 | r#"[{"key": "value"}]"# |
| 604 | ); |
| 605 | |
| 606 | // Fenced JSON embedded in text |
| 607 | assert_eq!( |
| 608 | repair_json_text_once("Here is the JSON:\n```json\n{\"key\": \"value\"}\n```\nDone."), |
| 609 | r#"{"key": "value"}"# |
| 610 | ); |
| 611 | |
| 612 | // No valid JSON, fallback to trimmed text |
| 613 | assert_eq!( |
| 614 | repair_json_text_once("Just some plain text without json"), |
| 615 | "Just some plain text without json" |
| 616 | ); |
| 617 | |
| 618 | // Fenced plain text, falls back to stripped and trimmed text |
| 619 | assert_eq!( |
| 620 | repair_json_text_once("```json\nJust some plain text\n```"), |
| 621 | "Just some plain text" |
| 622 | ); |
| 623 | |
| 624 | // An unmatched opening bracket must not block a later valid object. |
| 625 | assert_eq!(repair_json_text_once("[note {\"ok\":1}"), r#"{"ok":1}"#); |
| 626 | |
| 627 | // Delimiters inside strings must not terminate the outer object. |
| 628 | assert_eq!( |
| 629 | repair_json_text_once(r#"Prefix text {"data": "[nested]"} postfix text"#), |
| 630 | r#"{"data": "[nested]"}"# |
| 631 | ); |
| 632 | |
| 633 | // The earliest balanced candidate may still be invalid JSON. Keep scanning |
| 634 | // until a balanced candidate also parses successfully. |
| 635 | assert_eq!( |
| 636 | repair_json_text_once(r#"[not-json] then {"ok":true}"#), |
| 637 | r#"{"ok":true}"# |
| 638 | ); |
| 639 | |
| 640 | // Escaped quotes and backslashes stay inside the JSON string. |
| 641 | assert_eq!( |
| 642 | repair_json_text_once( |
| 643 | r#"prefix {"value":"a \"quoted\" [item]","path":"C:\\tmp"} suffix"# |
| 644 | ), |
| 645 | r#"{"value":"a \"quoted\" [item]","path":"C:\\tmp"}"# |
| 646 | ); |
| 647 | |
| 648 | // A mismatched outer delimiter must not consume a later valid payload. |
| 649 | assert_eq!( |
| 650 | repair_json_text_once(r#"[broken} then [1,{"ok":true}]"#), |
| 651 | r#"[1,{"ok":true}]"# |
| 652 | ); |
| 653 | } |
| 654 | } |
| 655 |