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Client-Side State Management for seamless user interactions #138

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@niikkhilsharma niikkhilsharma commented Jan 28, 2024

This pull request introduces significant improvements to state management, event parsing, and frontend context handling, along with refactoring and code hygiene enhancements.

Key Changes:

New Features:

  • Backend State and Hook Handling:
    • Refactored state and hook creation logic for enhanced efficiency and maintainability.
  • Event Parsing and Formatting:
    • Expanded capabilities of utility functions to better parse and format events, promoting data consistency.

Refactor:

  • Deterministic Function Naming:
    • Improved predictability and readability in frontend components by adopting deterministic function naming conventions.

Chores:

  • .gitignore Update:
    • Excluded .web files for cleaner repository management.
  • Frontend Template Imports:
    • Added essential imports to frontend templates to ensure proper context accessibility.

Specific Changes:

  • Jinja Template Modification:
    • Restricted DispatchContext imports to index.js for optimized loading.
  • Hooks in var.py:
    • Introduced new hooks to augment functionality.
  • Dynamic Rendering in dispatcher_line:
    • Implemented dynamic rendering of values for enhanced flexibility.
  • Syntax Correction in component.py:
    • Resolved a syntax error in rendered JavaScript code by appending a closing brace.

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coderabbitai bot commented Jan 28, 2024

Walkthrough

The recent updates across various components of the project introduce enhancements and new features focused on state management, event handling, and component rendering. Specifically, these changes refine the way files and extensions are ignored, improve state setting and hook creation mechanisms, ensure deterministic naming for rendered components, and augment event formatting capabilities. Collectively, these modifications aim to streamline development workflows and bolster the application's functionality.

Changes

Files Change Summary
app-examples/gallery/.gitignore Added pattern to ignore *.web files.
nextpy/backend/vars.py
nextpy/frontend/.../base_page.js.jinja2
Enhanced state setting with useContext for dispatchers;
Added DispatchContext import.
nextpy/frontend/components/component.py Modified hashing process for deterministic function names by adding '}' to rendered_chain.
nextpy/utils/format.py Updated event parsing and formatting with new control flow for constructing dispatcher_line.

🐇✨
Changes here, changes there,
Code hops around with utmost care.
With every update, we refine,
A better future, line by line.
🌟🐾

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@anubrag
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anubrag commented Jan 28, 2024

@coderabbitai review

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Review Status

Actionable comments generated: 2

Configuration used: CodeRabbit UI

Commits Files that changed from the base of the PR and between 19f3562 and 004c8f0.
Files ignored due to path filters (1)
  • pyproject.toml is excluded by: !**/*.toml
Files selected for processing (5)
  • app-examples/gallery/.gitignore (1 hunks)
  • nextpy/backend/vars.py (1 hunks)
  • nextpy/frontend/components/component.py (1 hunks)
  • nextpy/frontend/templates/jinja/web/pages/base_page.js.jinja2 (1 hunks)
  • nextpy/utils/format.py (1 hunks)
Files skipped from review due to trivial changes (2)
  • app-examples/gallery/.gitignore
  • nextpy/frontend/templates/jinja/web/pages/base_page.js.jinja2
Additional comments: 3
nextpy/utils/format.py (1)
  • 349-376: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [1-349]

The rest of the format.py file, outside the modified format_prop function, remains unchanged and appears to be consistent with the file's purpose of providing various formatting utilities for the application. No additional issues or concerns are identified in these sections.

The unmodified sections of the file are consistent with the application's formatting needs and do not introduce new issues.

nextpy/frontend/components/component.py (1)
  • 1593-1594: The addition of a closing brace } directly to the rendered_chain string at line 1593 is a straightforward approach to ensure the JavaScript code block is correctly closed. However, this method might introduce risks if rendered_chain does not always represent a block of code that requires a closing brace or if additional context is needed to determine the correct placement of the closing brace. Consider verifying the consistency and correctness of this approach across different use cases.
nextpy/backend/vars.py (1)
  • 1476-1477: The addition of DispatchContext in the hooks dictionary uses a semicolon ; at the end of the line within the string. This is consistent with JavaScript syntax but ensure that all JavaScript code executed in this context adheres to this syntax standard for consistency.

Comment on lines 1590 to 1597
if isinstance(rendered_chain, str):
rendered_chain = rendered_chain.strip("{}")

rendered_chain = rendered_chain+'}'

# Hash the rendered EventChain to get a deterministic function name.
chain_hash = md5(str(rendered_chain).encode("utf-8")).hexdigest()
memo_name = f"{event_trigger}_{chain_hash}"
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📝 NOTE
This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [1-1594]

The file introduces a comprehensive framework for defining and rendering components in a Next.js application, leveraging React and custom logic for state management, event handling, and dynamic rendering. The implementation of StatefulComponent and its memoization strategy is particularly noteworthy, aiming to optimize re-renders and improve performance. However, ensure that the memoization logic correctly handles all edge cases, especially concerning dynamic content and event handlers, to prevent stale renders or incorrect behavior. Additionally, the extensive use of dynamic typing and reflection could impact maintainability and type safety; consider leveraging TypeScript or more explicit type annotations for critical paths in the codebase.

Comment on lines 351 to +373
event = f"addEvents([{chain}], {arg_def}, {json_dumps(prop.event_actions)})"
prop = f"{arg_def} => {event}"

if isinstance(event, str):
event = event.strip("{}")

parts = chain.split('.')
formatted_chain = f'{parts[0]} . {parts[1]}.{parts[2]}'

# Extract "_e0.target.value"
value_match = re.search(r"value:([^,)}]+)", event)
if value_match:
value = value_match.group(1)


# Extract "state.state"
message_match = re.search(r"addEvents\(\[\S+?\(\"([^.]+?\.[^.]+)", event)
if message_match:
message = message_match.group(1)

dispatcher_line = f"const dispatcher = dispatchers['{message}'];\n" \
f"dispatcher({{ message: {value} }});"

prop = f"{arg_def} =>{{ {dispatcher_line}\n{event} }}"
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The implementation of event handling within the format_prop function introduces several issues and areas for improvement:

  1. Complexity: The function has become significantly more complex with the addition of event handling logic. Consider refactoring to improve readability and maintainability.
  2. Hardcoded Values: The construction of formatted_chain (line 357) seems to assume a specific structure for chain. This might not be robust against different event structures.
  3. Regex Usage: The use of regex to extract values (lines 360-362 and 366-368) could be error-prone and might not work as expected for all possible event formats.
  4. Dispatcher Line Construction: The construction of dispatcher_line (lines 370-371) directly within the function increases its responsibilities beyond formatting props. Consider separating event dispatching logic into a dedicated function or module.

Consider refactoring the event handling logic to address these concerns, potentially by separating concerns and simplifying the implementation.

@anubrag anubrag removed their request for review January 28, 2024 11:05
@@ -1590,6 +1590,8 @@ def _get_memoized_event_triggers(
if isinstance(rendered_chain, str):
rendered_chain = rendered_chain.strip("{}")

rendered_chain = rendered_chain+'}'

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Why is this change made? Isn't rendered_chain working correctly previously?

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I've noticed an issue with the original rendered_chain definition in the component.py file. The initial code is as follows:

{(_e0) =>{ 
    const dispatcher = dispatchers['state.state'];
    dispatcher({ message: _e0.target.value });
    addEvents([Event("state.state.set_message", {value:_e0.target.value})], _e0, {}) 
}}

However, there seems to be a processing step that alters rendered_chain by removing the opening and closing curly brackets {}. This modification necessitates manually appending an additional closing curly bracket } at the end of the rendered_chain to ensure correct rendering in the index.js file. The modified code looks like this:

_e0 => {
    const dispatcher = dispatchers['state.state']
    dispatcher({ message: _e0.target.value })
    addEvents([Event('state.state.set_message', { value: _e0.target.value })], _e0, {})
},

This workaround fixes the rendering issue.

@@ -13,6 +13,7 @@ Purpose:
{# ==============================
LIBRARY IMPORTS BLOCK
============================== #}
import { DispatchContext } from 'utils/context'

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Instead of doing it here, we should move this to default imports which are being used by the jinja template from utils.py file (most probably)

Comment on lines +353 to +373
if isinstance(event, str):
event = event.strip("{}")

parts = chain.split('.')
formatted_chain = f'{parts[0]} . {parts[1]}.{parts[2]}'

# Extract "_e0.target.value"
value_match = re.search(r"value:([^,)}]+)", event)
if value_match:
value = value_match.group(1)


# Extract "state.state"
message_match = re.search(r"addEvents\(\[\S+?\(\"([^.]+?\.[^.]+)", event)
if message_match:
message = message_match.group(1)

dispatcher_line = f"const dispatcher = dispatchers['{message}'];\n" \
f"dispatcher({{ message: {value} }});"

prop = f"{arg_def} =>{{ {dispatcher_line}\n{event} }}"

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Can you add example as comment for each part which details the input and output from the executed code?

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sure 👍

# Extract "_e0.target.value"
value_match = re.search(r"value:([^,)}]+)", event)
if value_match:
value = value_match.group(1)

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Would .group(1) call always return something?

pyproject.toml Show resolved Hide resolved
@anubrag anubrag changed the title Implement responsive local state management for immediate user feedback Client-Side State Management for seamless user interactions Jan 31, 2024
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3 participants