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