feat(blocks): add TextEncoderBlock for escape sequence encoding

[majiayu000]

Summary

Implements a new TextEncoderBlock that encodes text by adding escape sequences for special characters. This is the reverse operation of the existing TextDecoderBlock.

• Uses Python's codecs.encode with unicode_escape codec
• Converts newlines, tabs, and other special characters to their escaped form
• Pairs with TextDecoderBlock for roundtrip encoding/decoding

Test plan

• Block includes built-in test_input and test_output for automated testing
• Verified roundtrip: decode(encode(text)) == text
• Code passes format and lint checks

Fixes #11111

[coderabbitai]

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[qodo-code-review]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review File Organization TextEncoderBlock is introduced inside decoder_block.py, which may make discoverability/maintenance harder and could affect how blocks are auto-registered/imported elsewhere. Confirm the project’s expected convention for block placement and exports so the new block is picked up consistently. class TextEncoderBlock(Block): """ Encodes text by adding escape sequences for special characters. This is the reverse operation of TextDecoderBlock. """ class Input(BlockSchemaInput): text: str = SchemaField( description="A string to be encoded with escape sequences", placeholder="Your text with newlines and special characters", ) class Output(BlockSchemaOutput): encoded_text: str = SchemaField( description="The encoded text with escape sequences added" ) def __init__(self): super().__init__( id="f8e7d6c5-4b3a-2190-8765-4321fedcba98", description="Encodes a string by adding escape sequences for special characters", categories={BlockCategory.TEXT}, input_schema=TextEncoderBlock.Input, output_schema=TextEncoderBlock.Output, test_input={ Edge Cases unicode_escape encoding can significantly transform input (e.g., escaping existing backslashes, representing non-ASCII as \uXXXX). Validate expected behavior for inputs containing literal backslashes, already-escaped sequences, and non-ASCII characters to ensure this block matches user expectations and round-trips correctly with the decoder. async def run(self, input_data: Input, **kwargs) -> BlockOutput: encoded_text = codecs.encode(input_data.text, "unicode_escape").decode("ascii") yield "encoded_text", encoded_text Test Coverage The provided test_input/test_output covers newlines and quotes, but does not cover other common escape cases like tabs, carriage returns, backslashes, and unicode characters. Consider extending the built-in test vectors to cover these cases to prevent regressions in encoding behavior. test_input={ "text": """Hello World! This is a "quoted" string.""" }, test_output=[ ( "encoded_text", """Hello\\nWorld!\\nThis is a "quoted" string.""", ) ], )