get_screen_example

Instructions

Implementation Reference

• src/index.ts:442-511 (handler)

  Registration and inline handler implementation for the 'get_screen_example' tool. Handles input validation, fetches screen example code from files with exact and fuzzy matching.

  server.tool(
    "get_screen_example",
    "Get a React Native screen example",
    {
      screen_name: z.string().describe("Screen Name"),
    },
    async ({ screen_name }) => {
      if (!screen_name) {
        return {
          content: [
            {
              type: "text",
              text: "Screen name not specified",
            },
          ],
        };
      }
      
      try {
        // First try exact match
        const result = getExampleContent("screens", screen_name);
        
        if (result.error) {
          // Try to find by fuzzy match
          const screensDir = path.join(CODE_EXAMPLES_DIR, "react-native", "screens");
          const closestMatch = findClosestMatch(screensDir, screen_name);
          
          if (closestMatch) {
            const fuzzyResult = getExampleContent("screens", closestMatch);
            return {
              content: [
                {
                  type: "text",
                  text: fuzzyResult.content?.[0] ?? fuzzyResult.error ?? "Error: No content available",
                },
              ],
            };
          } else {
            return {
              content: [
                {
                  type: "text",
                  text: `Screen ${screen_name} not found`,
                },
              ],
            };
          }
        }
        
        return {
          content: [
            {
              type: "text",
              text: result.content?.[0] ?? result.error ?? "Error: No content available",
            },
          ],
        };
      } catch (err) {
        console.error(`Error getting screen example ${screen_name}:`, err);
        return {
          content: [
            {
              type: "text",
              text: `Error getting screen example: ${err}`,
            },
          ],
        };
      }
    },
  );

• src/index.ts:65-84 (helper)

  Helper function to retrieve content from example files in the code-examples directory by subcategory and filename.

  function getExampleContent(subcategory: string, filename: string): { content?: string[]; path?: string; error?: string } {
    const searchDir = path.join(CODE_EXAMPLES_DIR, "react-native", subcategory);
    
    const filePath = findFileInSubdirectories(searchDir, filename);
    
    if (!filePath || !fs.existsSync(filePath)) {
      return { error: `Example ${filename} not found` };
    }
    
    try {
      const content = fs.readFileSync(filePath, 'utf8');
      return {
        content: [content],
        path: path.relative(BASE_DIR, filePath)
      };
    } catch (err) {
      console.error(`Error reading example ${filename}:`, err);
      return { error: `Error reading example ${filename}` };
    }
  }

• src/index.ts:87-109 (helper)

  Helper function for fuzzy matching filenames containing the search term within a directory.

  function findClosestMatch(directory: string, searchName: string, extensions: string[] = ['.js', '.jsx', '.ts', '.tsx']) {
    if (!fs.existsSync(directory)) return null;
    
    let closestMatch = null;
    
    for (const ext of extensions) {
      const files = glob.sync(`${directory}/**/*${ext}`);
      
      for (const filePath of files) {
        const fileName = path.basename(filePath);
        const fileNameNoExt = path.basename(fileName, path.extname(fileName));
        
        if (fileNameNoExt.toLowerCase().includes(searchName.toLowerCase())) {
          closestMatch = fileNameNoExt;
          break;
        }
      }
      
      if (closestMatch) break;
    }
    
    return closestMatch;
  }

• src/index.ts:445-447 (schema)

  Zod schema for the tool input parameter 'screen_name'.

  {
    screen_name: z.string().describe("Screen Name"),
  },