Dev tools · September 24, 2024
An expression parser supporting multiple types
This C library is part of a main project aimed at providing a reactive key-value (KV) database. The data is typed (numbers, strings, dates, or booleans) and can include formulas with references to other entries. Clients connected to this database receive a real-time data stream with updates to the subscribed keys, allowing them to react to changes and their dependencies. Essentially, it’s like building a distributed Excel, where data and formulas dynamically update across the system. I couldn’t find any libraries that offered the full set of features I needed for evaluating expressions, so I…
An expression parser supporting multiple types launched on September 24, 2024 with 33 votes, #662 of 5,281 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
This C library parses and evaluates typed expressions for a reactive key-value database system. It supports multiple data types including numbers, strings, dates, and booleans, and handles formulas with references to other entries. The library enables real-time updates across connected clients when data or dependencies change, functioning like a distributed spreadsheet. It was created to fill gaps in existing expression evaluation libraries and is available open-source on GitHub.
written from the facts on this page · September 2026
From the sources
An expression parser supporting multiple types. Contribute to torrentg/expr development by creating an account on GitHub.
In the maker’s words, at launch
This C library is part of a main project aimed at providing a reactive key-value (KV) database. The data is typed (numbers, strings, dates, or booleans) and can include formulas with references to other entries. Clients connected to this database receive a real-time data stream with updates to the subscribed keys…
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Source: Show HN post ↗ · launch text quoted in part
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