Any values that have greater power library crash the app and app is stuck on that state

[fkleon]

Hi @alihassan143 thanks for creating this issue. I can't reproduce this without more details, could you please provide an example that triggers the issue?

[alihassan143]

98^789

[alihassan143]

or 78^7897^7867. if i add more power the library stops the app for performing other tasks and crash the app

[fkleon]

I'm still not able to reproduce this. I've created a simple benchmark here comparing Dart's pow function and math_expressions: 75d793f9aebbc9a4c5f4fe6fc8f42e4fecda0825

On my machine this evaluates quickly and correctly to Infinity in both cases, math_expressions being about 66% slower than Dart's native pow function.

The benchmark below is for 10,000 iterations each as per commit:

$ dart run benchmark
 DONE  ./benchmark/power_benchmark.dart (5 s)
 ✓ Math.pow (3 ms)
 ✓ math_expressions.pow (5 ms)

Benchmark suites: 1 passed, 1 total
Benchmarks:       2 passed, 2 total
Time:             5 s

What hardware and architecture are you experiencing this issue on? Does it also happen when you use math.pow?

[alihassan143]

this is happening when i used your library in app and i call parser.parse() in init state the library stuck the app in one state i even try the future delayed but this still this stop the app from working

[alihassan143]

i am using intel base macbook pro and i try this values on both real device and emulator app still crash even i try the debugging the app but debugger did not show error also

[fkleon]

Thanks for the additional details. I've looked at the parser and added a similar benchmark, and am still not able to reproduce this.

Are you sure that the call to parse() is causing the delay, and not some code in your application? Could you share a minimal code snippet that can be used to reproduce this?

For further investigation it would also be helpful to:

• Measure execution time of the call to parse, e.g. with the Stopwatch
• If this in a Flutter app I'd be interested to see the output of a performance trace around the problematic code block

[alihassan143]

yes its caused by the parser because i also limit length of the string but when parsing the greater values it stuck the app

[fkleon]

@alihassan143 Any chance you can provide any of the additional details I asked for in https://github.com/fkleon/math-expressions/issues/57#issuecomment-995131351?

The example expressions you've given earlier do not reproduce the issue for me and are parsing in a few milliseconds at most. I've tried with 98^789, 78^7897^7867 and 78^78*97^78*67.

[alihassan143]

now i find the cause is that flutter text widget shows error on long string i am converting the powers into real number that is generating long string and flutter text widget is not able to handle that string