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web2_projects/medium/posts.py

@@ -0,0 +1,121 @@
+import json
+
+
+def solution(postContentString, deltasString):
+		postContent = json.loads(postContentString)
+		deltas = json.loads(deltasString)
+    
+    # -------------------------------------
+    # Loop to each delta action from deltas.
+    # -------------------------------------
+		for delta in deltas:
+
+				# ----------------------
+        # Get delta action data.
+        # ----------------------
+				try:
+						delta_type = delta['type']
+						delta_pindex = delta['paragraphIndex']
+            
+            # ---------------------------------------
+            # Check if delta paragraph index is valid.
+            # ---------------------------------------
+						if delta_pindex < 0 or delta_pindex >= len(postContent['paragraphs']):
+								continue
+            
+				except (KeyError, IndexError) as e:
+						continue
+            
+				# ------------------------------
+        # Execute update paragraph delta.
+        # ------------------------------
+				if delta_type == 'updateParagraph':
+						try:
+								delta_paragraph_text = delta['paragraph']['text']
+								postContent['paragraphs'][delta_pindex]['text'] = delta_paragraph_text
+
+						except IndexError:
+								continue
+						
+				# ----------------------------
+        # Execute add paragraph delta.
+        # ----------------------------
+				elif delta_type == 'addParagraph':
+						try:
+								delta_paragraph = delta['paragraph']
+								postContent['paragraphs'].insert(delta_pindex, delta_paragraph)
+								
+                # ------------------
+                # Fix section index.
+                # ------------------
+								i = delta_pindex
+								while i < len(postContent['sections'][delta_pindex:]) + 1:
+										postContent['sections'][i]['startIndex'] +=  1
+										i += 1
+              
+						except IndexError:
+								continue
+						
+				# -------------------------------
+        # Execute delete paragraph delta.
+        # -------------------------------
+				elif delta_type == 'deleteParagraph':
+						try:
+								postContent['paragraphs'].pop(delta_pindex)
+								
+                # ------------------
+                # Fix section index.
+                # ------------------
+                
+                # Fix section indexes after removal.
+								i = delta_pindex 
+								while i < len(postContent['sections'][delta_pindex:]) + 1:
+										postContent['sections'][i]['startIndex'] -=  1
+										i += 1
+                
+                # Remove any empty section.
+								i = 1
+								for i, section in enumerate(postContent['sections']):
+										if section['startIndex'] <= 0:
+												postContent['sections'].pop(i)
+
+						except IndexError:
+								continue
+
+		# ------------------
+    # Print out results.
+    # ------------------
+		try:
+				# -------------------------------------------
+    		# Extract sections and paragraph, after delta.
+				# -------------------------------------------
+				sections = postContent['sections']
+				paragraphs = postContent['paragraphs']
+                                 
+				# ------------------------
+        # Find all section indexes.
+        # ------------------------
+				section_indexes = set()
+				for section in sections:
+						section_indexes.add(section['startIndex'])
+        
+        # ---------------------------------------------------
+        # Loop over paragraphs to create the resulting string.
+        # ---------------------------------------------------
+				res = []
+
+				for i, paragraph in enumerate(paragraphs, start=1):
+
+						if i == len(paragraphs):
+								res.append(f'{paragraph["text"]}')
+          
+						elif i in section_indexes:
+								res.append(f'{paragraph["text"]}\n-\n')
+           
+						else:
+								res.append(f'{paragraph["text"]}\n')
+
+		except (KeyError, ValueError) as e:
+				print(f'Error: Input data is ill-formatted: {e}')
+
+		return ''.join(res)