feat: show detail log when esdoc could not process code.

#14

src/ESDoc.js

@@ -8,6 +8,7 @@ import ESParser from './Parser/ESParser';
 import PathResolver from './Util/PathResolver.js';
 import DocFactory from './Factory/DocFactory.js';
 import TestDocFactory from './Factory/TestDocFactory.js';
+import InvalidCodeLogger from './Util/InvalidCodeLogger.js';
 
 let logger = new Logger('ESDoc');
 
@@ -225,7 +226,12 @@ export default class ESDoc {
     let factory = new DocFactory(ast, pathResolver);
 
     ASTUtil.traverse(ast, (node, parent)=>{
-      factory.push(node, parent);
+      try {
+        factory.push(node, parent);
+      } catch(e) {
+        InvalidCodeLogger.show(filePath, node);
+        throw e;
+      }
     });
 
     return {results: factory.results, ast: ast};
@@ -253,7 +259,12 @@ export default class ESDoc {
     let factory = new TestDocFactory(type, ast, pathResolver);
 
     ASTUtil.traverse(ast, (node, parent)=>{
-      factory.push(node, parent);
+      try {
+        factory.push(node, parent);
+      } catch(e) {
+        InvalidCodeLogger.show(filePath, node);
+        throw e;
+      }
     });
 
     return {results: factory.results, ast: ast};

src/Util/InvalidCodeLogger.js

@@ -0,0 +1,27 @@
+import fs from 'fs-extra';
+
+class InvalidCodeLogger {
+  show(filePath, node) {
+    let lines = fs.readFileSync(filePath).toString().split('\n');
+    let targetLines = [];
+    let start;
+    let end = node.loc.start.line;
+
+    if (node.leadingComments && node.leadingComments[0]) {
+      start = node.leadingComments[0].loc.start.line;
+    } else {
+      start = Math.max(0, end - 10);
+    }
+
+    for (let i = start - 1; i < end; i++) {
+      targetLines.push(`${i}| ` + lines[i]);
+    }
+
+    console.log('error: could not process the following code.');
+    console.log(filePath);
+    console.log(targetLines.join('\n'));
+    console.log('');
+  }
+}
+
+export default new InvalidCodeLogger();