how to get context of expectation failures in boost spirit qi?












0















I am using boost spirit v1.67.



I want the parser to provide exact error codes, ie, contextual error messages as to where it failed.



For eg -




  1. InvalidNumber - Number greater than 2,147,483,647 for int_

  2. InvalidSequence - invalid sequence of characters AB, expecting BA.


Options I think would work, but would need advise on how to go about it-




  1. throw custom exceptions from on_error, and catch them after the parse method

  2. use on_error to track the exact failure and then save the error code in some variable which will be accessible later.

  3. accept a bit of invalid data in the parser only to flag it after the parser runs in post processing checks. (eg - accept long int instead of int and flag as an error in post processing if number is greater than max_int).










share|improve this question























  • All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

    – sehe
    Jan 3 at 21:04


















0















I am using boost spirit v1.67.



I want the parser to provide exact error codes, ie, contextual error messages as to where it failed.



For eg -




  1. InvalidNumber - Number greater than 2,147,483,647 for int_

  2. InvalidSequence - invalid sequence of characters AB, expecting BA.


Options I think would work, but would need advise on how to go about it-




  1. throw custom exceptions from on_error, and catch them after the parse method

  2. use on_error to track the exact failure and then save the error code in some variable which will be accessible later.

  3. accept a bit of invalid data in the parser only to flag it after the parser runs in post processing checks. (eg - accept long int instead of int and flag as an error in post processing if number is greater than max_int).










share|improve this question























  • All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

    – sehe
    Jan 3 at 21:04
















0












0








0








I am using boost spirit v1.67.



I want the parser to provide exact error codes, ie, contextual error messages as to where it failed.



For eg -




  1. InvalidNumber - Number greater than 2,147,483,647 for int_

  2. InvalidSequence - invalid sequence of characters AB, expecting BA.


Options I think would work, but would need advise on how to go about it-




  1. throw custom exceptions from on_error, and catch them after the parse method

  2. use on_error to track the exact failure and then save the error code in some variable which will be accessible later.

  3. accept a bit of invalid data in the parser only to flag it after the parser runs in post processing checks. (eg - accept long int instead of int and flag as an error in post processing if number is greater than max_int).










share|improve this question














I am using boost spirit v1.67.



I want the parser to provide exact error codes, ie, contextual error messages as to where it failed.



For eg -




  1. InvalidNumber - Number greater than 2,147,483,647 for int_

  2. InvalidSequence - invalid sequence of characters AB, expecting BA.


Options I think would work, but would need advise on how to go about it-




  1. throw custom exceptions from on_error, and catch them after the parse method

  2. use on_error to track the exact failure and then save the error code in some variable which will be accessible later.

  3. accept a bit of invalid data in the parser only to flag it after the parser runs in post processing checks. (eg - accept long int instead of int and flag as an error in post processing if number is greater than max_int).







c++ boost boost-spirit boost-spirit-qi






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asked Jan 3 at 16:01









vinzee93vinzee93

164




164













  • All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

    – sehe
    Jan 3 at 21:04





















  • All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

    – sehe
    Jan 3 at 21:04



















All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

– sehe
Jan 3 at 21:04







All these approaches are valid. There are examples of eacht of them on this site. I don't see what I can/should ask since the question is so broad (in the functional programming spirit you might prefer to represent an error node in the ast so you can adapt behaviour depending on surrounding context, or supply logic on partially parsed input)

– sehe
Jan 3 at 21:04














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