https://github.com/janchy2/json-expression-parser-cpp

A C++ console application that allows evaluating expressions on a JSON file.
https://github.com/janchy2/json-expression-parser-cpp

cpp json parser tokenizer

Last synced: 2 months ago
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A C++ console application that allows evaluating expressions on a JSON file.

• Host: GitHub
• URL: https://github.com/janchy2/json-expression-parser-cpp
• Owner: janchy2
• Created: 2024-11-03T19:27:12.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2024-11-03T19:48:08.000Z (over 1 year ago)
• Last Synced: 2025-04-12T14:46:56.019Z (about 1 year ago)
• Topics: cpp, json, parser, tokenizer
• Language: C++
• Homepage:
• Size: 12.7 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
A **C++** console application that allows evaluating expressions on a **JSON** file.

Example of usage:  

 - test.json is a JSON file with the content:

{"a": { "b": [ 1, 2, { "c": "test" }, [11, 12] ]}}

- ./json_eval is the console application

The application supports:

- Trivial expressions with JSON paths:

  $ ./json_eval test.json "a.b[1]"

  

  2

  $ ./json_eval test.json "a.b[2].c"

  

  test

  

  $ ./json_eval test.json "a.b"

  

  [ 1, 2, { "c": "test" } ]

  

- Expressions in the subscript operator []:

  

  $ ./json_eval test.json "a.b[a.b[1]].c"

  

  test

- Intrinsic functions: min, max, avg, sum, size:

  min, max, avg and sum return the min, max element, avg of or sum of elements from the passed array or arguments.

  

  $ ./json_eval test.json "max(a.b[0], a.b[1])"

  

  2

  

  $ ./json_eval test.json "min(a.b[3])"

  

  11

  

  size - returns size of the passed object, array or string

  

  $ ./json_eval test.json "size(a)"

  

  1

  

  $ ./json_eval test.json "size(a.b)"

  

  4

  

  $ ./json_eval test.json "size(a.b[a.b[1]].c)"

  

  4

  

- Number literals:

  $ ./json_eval test.json "max(a.b[0], 10, a.b[1], 15)"

  

  15

- Arithmetic binary operators: +, -, *, /:

  $ ./json_eval test.json "a.b[0] + a.b[1]"

  

  3

  

The application uses async tasks to speed up the evaluation of operator expressions.