Awesome
jsn
jsn is a user-friendly data format that can be easily read and reliably edited by humans.
It adds powerful features such as inheritance, variables, includes and syntax improvements to make jsn files more compact and re-usable than a json counterpart, it is an ideal solution for multi-platform build configuration, packaging and content buidling pipelines.
jsn can be used directly in python as a dictionary, or it can be converted to json to be used with other languages and tools and libraries which have json support.
If you are using hand edited json in any projects currently, jsn will easily integrate into your existing workflow and improve efficiency and reliability.
Features
- Includes / file import.
- Inheritance (hierarchicle and multiple).
- Environment style scoped variables.
- Quoteless keys.
- Quoteless strings.
- Single quotes.
- Single and multi-line comments.
- Multi-line strings / line breaks.
- Hex, binary, bit shifts, int and float improvements.
- TextMate langauge included for enhanced syntax highlighting.
CLI
You can convert jsn to json using the commandline, clone this repository and add jsn to your path.
jsn -i example.jsn -o example.json -I import_dir
jsn -help
--------------------------------------------------------------------------------
jsn ----------------------------------------------------------------------------
--------------------------------------------------------------------------------
commandline arguments:
-help display this message
-i list of input files or directories to process
-o output file or directory
-I list of import directories, to search for imports
-p print output to console
-keep_vars keep jsn_vars in the output json
Python API
Install via pip:
python3 -m pip install jsn
Or alternatively copy jsn.py where you need it.
jsn can be used just like json as a python dictionary.
import jsn
json_dict = jsn.loads(open("jsn_file.jsn", "r").read())
Releases
You can install jsn as a binary release found along with this repository here
Example .jsn
import import.jsn
import test.jsn
{
// sytax highlights quite nicely in most editors with c or c++ syntax
// jsonnet highlights nicely in GitHub
// TextMate grammar included for visual studio, vscode or other compatible editors
// allow comments
/*
multi-
line
comments
*/
// tabs and any whitespace allowed
// compatible with json
"json":
{
"bool": true,
"int": 1,
"float": 1.0,
"string": "yes",
"array": [1, 2, 3]
},
// compatible with json5
json5:
{
unquoted: 'and you can quote me on that',
single_quotes: 'I can use "double quotes" here',
hexadecimal: 0xdecaf,
line_breaks: "Look, Mom! No \
\\n's!",
leading_decimal_point: .8675309, and_trailing: 8675309.,
positive_sign: +1,
trailing_comma: 'in objects', and_in: ['arrays',],
},
// jsn features
jsn:
{
// ditch the quotes and commas!
unquoted_string: without_whitespace // cannot contain whitespace or special chars (see str_test)
unquoted: [strings, in, arrays]
binary_literal: 0b10011
bit_shifts: 1<<16 | 1<<8
// mixed newline and commas
object_members_separated_by_newline: {
no_commas: yes
with_new_lines: "if you like"
but: "you can", still: "use them here"
}
arrays_elements_separated_by_newline:[
"no need for commas"
"if you use newlines"
"still", "separate", "using commas", "on the same line"
]
// you can define variables to be re-used
jsn_vars:
{
data: "path/to/data"
var_str: "hello"
var_int: 10
}
// evaluate variables with ${} inside quotes..
variable_data_path: "${data}/subdir"
variable_int: "${var_int}"
array_of_vars: ["${data}", "${var_str}"]
// you can use special variables:
// inject the current script directory into a string
// - this is the directory name of the file this variable is used in
script_directory: "${script_dir}"
// env vars can also be injected, if no variable is found in the script jsn will fallback to check if an env var exists
env_vars: ${OS_ENV_VAR}
// subobjects can be merged and inherited recursively see ** inheritence(jsn)
base: "foo"
sub_object:
{
one: "1"
two: "2"
nested_var: "${var_int}" // variable comes from outer scope.
}
// use <windows, mac, linux> in angled brackets to conditionally include or exclude keys
// the platform specific keys will be merged into the base key if one exists
platform:
{
base: "exists"
}
// useful for selecting platform specific paths and executables
platform<windows>:
{
exe: "path/windows/program.exe"
}
platform<mac>:
{
exe: "path/mac/program"
}
},
//**
inheritence(jsn): // add object name to inherit inside parenthesis
{
// inheritance adds keys from 'jsn' object
// ..
// duplicated keys are overridden by the derived object
base: "bar",
// inheritance on sub-objects continues recursively
sub_object:
{
three: "3"
//..
}
},
// multiple and hierarchical inheritance
objb: { b: "b" },
multiple_inheritence(inheritence, objb):
{
// vars can also be shadowed / overriden..
jsn_vars:
{
data: "another/path/to/data",
var_int: 22
},
c: "c"
},
xxx:
{
// some test cases
empty_object: {},
empty_array: [],
array_of_objects:[
{object: 1, other: "value"},
{object: 2, other: "value"}
],
array_with_string_commas:[
"test,2",
"test,3"
],
nested_objects:
{
yes: true,
and:
{
deeper: nesting
}
},
multi_type_arrays:[
1,
[2, 3]
],
array_of_arrays:[
[hello, world],
[goodbye, world]
],
array_of_values:[
+255,
0b11111111,
0xff,
1 << 1,
1 << 2 | 1,
1 << 2 | 1,
.255
],
jsn_vars:
{
va: "path/to/data",
vb: "hello",
},
value: null,
array_of_null: [null, null, null]
array_of_array_vars: [
["${va}", "${vb}"],
["${vb}", "non var"]
],
multiple_vars: "${va}/${vb}.bin",
q1: "small 'quotes' inside",
q2: 'double "quotes" inside',
q3: "double escaped \"quotes\" inside"
},
//**
str_test: ":[{}]'+.,0b0x" // this tests ignoring special chars inside quotes
}