Fix/yaml formatting (#590)

* Bug/curly_braces_yaml

Added parser to help users on yaml syntax

* context error

Patch and later will prioritize this again to have context work with the yaml

src/crewai/project/crew_base.py

@@ -1,6 +1,7 @@
 import inspect
 import os
 from pathlib import Path
+from crewai.utilities.parser import YamlParser
 
 import yaml
 from dotenv import load_dotenv
@@ -40,6 +41,7 @@ def CrewBase(cls):
         @staticmethod
         def load_yaml(config_path: str):
             with open(config_path, "r") as file:
-                return yaml.safe_load(file)
+                parsedContent = YamlParser.parse(file)
+                return yaml.safe_load(parsedContent)
 
     return WrappedClass

src/crewai/utilities/__init__.py

@@ -6,3 +6,4 @@ from .printer import Printer
 from .prompts import Prompts
 from .rpm_controller import RPMController
 from .fileHandler import FileHandler
+from .parser import YamlParser

src/crewai/utilities/parser.py

@@ -0,0 +1,17 @@
+import re
+
+
+class YamlParser:
+    def parse(file):
+        content = file.read()
+        # Replace single { and } with doubled ones, while leaving already doubled ones intact and the other special characters {# and {%
+        modified_content = re.sub(r"(?<!\{){(?!\{)(?!\#)(?!\%)", "{{", content)
+        modified_content = re.sub(
+            r"(?<!\})(?<!\%)(?<!\#)\}(?!})", "}}", modified_content
+        )
+        # Check for 'context:' not followed by '[' and raise an error
+        if re.search(r"context:(?!\s*\[)", modified_content):
+            raise ValueError(
+                "Context is currently only supported in code when creating a task. Please use the 'context' key in the task configuration."
+            )
+        return modified_content