| 108 | } |
| 109 | |
| 110 | private createMessageStream( |
| 111 | reader: ReadableStreamDefaultReader<Uint8Array>, |
| 112 | ): ReadableStream<StreamResponse> { |
| 113 | let buffer = ""; |
| 114 | const language = get(languageStore); |
| 115 | const validator = new LanguageValidator(language); |
| 116 | |
| 117 | const processResponse = (response: StreamResponse) => { |
| 118 | const pattern = get(selectedPatternName); |
| 119 | |
| 120 | if (pattern) { |
| 121 | // Do NOT call cleanPatternOutput here - it runs on each streaming token |
| 122 | // and .trim() strips leading spaces that serve as word separators. |
| 123 | // Cleaning should be done on the final accumulated content at display time. |
| 124 | |
| 125 | // Simplified format determination - always markdown unless mermaid |
| 126 | const isMermaid = [ |
| 127 | "graph TD", |
| 128 | "gantt", |
| 129 | "flowchart", |
| 130 | "sequenceDiagram", |
| 131 | "classDiagram", |
| 132 | "stateDiagram", |
| 133 | ].some((starter) => response.content.trim().startsWith(starter)); |
| 134 | |
| 135 | response.format = isMermaid ? "mermaid" : "markdown"; |
| 136 | } |
| 137 | |
| 138 | if (response.type === "content") { |
| 139 | response.content = validator.enforceLanguage(response.content); |
| 140 | } |
| 141 | |
| 142 | return response; |
| 143 | }; |
| 144 | return new ReadableStream({ |
| 145 | async start(controller) { |
| 146 | try { |
| 147 | while (true) { |
| 148 | const { done, value } = await reader.read(); |
| 149 | if (done) break; |
| 150 | |
| 151 | buffer += new TextDecoder().decode(value); |
| 152 | const segments = buffer.split("\n\n"); |
| 153 | // Last segment may be incomplete; keep it as buffer |
| 154 | buffer = segments.pop() || ""; |
| 155 | for (const segment of segments) { |
| 156 | const trimmed = segment.trim(); |
| 157 | if (!trimmed.startsWith("data: ")) continue; |
| 158 | try { |
| 159 | let response = JSON.parse( |
| 160 | trimmed.slice(6), |
| 161 | ) as StreamResponse; |
| 162 | |
| 163 | response = processResponse(response); |
| 164 | controller.enqueue(response); |
| 165 | } catch (parseError) { |
| 166 | console.error( |
| 167 | "Error parsing stream message:", |