ORNL/GridKit

Bug: JSON parser infers data type from input parameter value

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#227 opened on Sep 10, 2025

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 (8 comments) (0 reactions) (1 assignee)C++ (10 forks)auto 404
bughelp wanted

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Description

Description how to reproduce the bug

JSON parser infers parameter data type from its value. This among other things will cause that floating point parameter is interpreted as integer if it is entered without decimal point in the input file. Retrieving this parameter as a floating point type will then cause an exception to be throw:

terminate called after throwing an instance of 'std::bad_variant_access'
Abort trap: 6

Possible solutions are

  • to interpret every parameter as the floating point number
  • have separate enums for real, integer and boolean parameters.

@superwhiskers

GridKit™ version

develop @ b191e6619bfd7d70a47e24b41fac238e3de1b9f3

System and environment details

Observed on MacOS 15.6.1 with gcc 13.3.0 and clang 16.0.6.

Additional information

No response

Contributor guide

Research direction
Reproduce the bug by creating a JSON file with a float value without decimal point. Then trace the parser code to find where the type is inferred. Consider implementing one of the suggested solutions: either treat all numbers as floats or add separate enums for real, integer, and boolean.
Tech stack
cpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75