Fix/336/csv-parse-error

[xiao-77]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @xiao-77, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the CSV parser to provide more accurate error detection and reporting for invalid CSV formats. It focuses on quote handling, ensuring that quotes are correctly placed and that no invalid characters appear after a closing quote. This change improves the robustness and user-friendliness of the CSV parsing functionality.

Highlights

• CSV Parsing Error Handling: This PR introduces more robust error handling for CSV parsing, specifically addressing issues related to improperly formatted quotes.
• Quote Handling: The code now validates that quotes appear only at the beginning or end of a field. It also checks for unclosed quotes at the end of the file and invalid characters after a closing quote.
• Error Message: A more descriptive error message is generated when invalid CSV format is detected, indicating that quotes must be at the field start/end and not in the middle.

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[gemini-code-assist]

Code Review

This pull request aims to fix CSV parsing errors by adding more robust validation logic to the csvParserReadLine function. The changes introduce new state-tracking flags to correctly handle quoted fields, delimiters, and end-of-file conditions. This includes checks for unclosed quotes, misplaced quotes, and invalid characters after a quoted field, which improves the parser's adherence to CSV format standards.

While the intent is good, I've identified a critical bug in the new logic that incorrectly handles spaces after a delimiter, which would cause the parser to fail on valid CSV data. Additionally, a new error message is too specific and can be misleading for different types of CSV format errors. My review includes suggestions to fix these issues.