JSON: Difference between revisions

=={{header|EGL}}==

Structures used both to construct and to parse JSON:

<lang EGL>

record familyMember

person person;

relationships relationship[]?;

end

record person

firstName string;

lastName string;

age int;

end

record relationship

relationshipType string;

id int;

end

</lang>

Construct JSON string:

<lang EGL>

people Person[]; // Array of people

people.appendElement(new Person { firstName = "Frederick", lastName = "Flintstone", age = 35} );

people.appendElement(new Person { firstName = "Wilma", lastName = "Flintstone", age = 34} );

people.appendElement(new Person { firstName = "Pebbles", lastName = "Flintstone", age = 2} );

people.appendElement(new Person { firstName = "Bernard", lastName = "Rubble", age = 32} );

people.appendElement(new Person { firstName = "Elizabeth", lastName = "Rubble", age = 29} );

people.appendElement(new Person { firstName = "Bam Bam", lastName = "Rubble", age = 2} );

family Dictionary; // Construct dictionary using uid as key

family["1"] = new FamilyMember{ person = people[1], relationships = [new Relationship{ relationshipType="spouse", id = 2 }, new Relationship{ relationshipType="child", id = 3}] };

family["2"] = new FamilyMember{ person = people[2], relationships = [new Relationship{ relationshipType="spouse", id = 1 }, new Relationship{ relationshipType="child", id = 3}] };

family["3"] = new FamilyMember{ person = people[3], relationships = [new Relationship{ relationshipType="mother", id = 2 }, new Relationship{ relationshipType="father", id = 1}] };

family["4"] = new FamilyMember{ person = people[4], relationships = [new Relationship{ relationshipType="spouse", id = 5 }, new Relationship{ relationshipType="child", id = 6}] };

family["5"] = new FamilyMember{ person = people[5], relationships = [new Relationship{ relationshipType="spouse", id = 4 }, new Relationship{ relationshipType="child", id = 6}] };

family["6"] = new FamilyMember{ person = people[6], relationships = [new Relationship{ relationshipType="mother", id = 5 }, new Relationship{ relationshipType="father", id = 4}] };

// Convert family members to JSON

jsonString string = jsonLib.convertToJSON(family);

// Show JSON string

SysLib.writeStdout(jsonString);

</lang>

Raw Output:

<pre>

{

"1":{"person":{"firstName":"Frederick","lastName":"Flintstone","age":35},"relationships":[{"relationshipType":"spouse","id":2},{"relationshipType":"child","id":3}]},

"2":{"person":{"firstName":"Wilma","lastName":"Flintstone","age":34},"relationships":[{"relationshipType":"spouse","id":1},{"relationshipType":"child","id":3}]},

"3":{"person":{"firstName":"Pebbles","lastName":"Flintstone","age":2},"relationships":[{"relationshipType":"mother","id":2},{"relationshipType":"father","id":1}]},

"4":{"person":{"firstName":"Bernard","lastName":"Rubble","age":32},"relationships":[{"relationshipType":"spouse","id":5},{"relationshipType":"child","id":6}]},

"5":{"person":{"firstName":"Elizabeth","lastName":"Rubble","age":29},"relationships":[{"relationshipType":"spouse","id":4},{"relationshipType":"child","id":6}]},

"6":{"person":{"firstName":"Bam Bam","lastName":"Rubble","age":2},"relationships":[{"relationshipType":"mother","id":5},{"relationshipType":"father","id":4}]}

}

</pre>

Validated Output (partial):

<pre>

{

"1": {

"person": {

"firstName": "Frederick",

"lastName": "Flintstone",

"age": 35

},

"relationships": [

{

"relationshipType": "spouse",

"id": 2

},

{

"relationshipType": "child",

"id": 3

}

]

},

...

}</pre>

Parse JSON:

<lang EGL>

// Convert JSON string into dictionary of family members

family Dictionary;

jsonLib.convertFromJSON(jsonString, family);

// List family members and their relationships

familyMember FamilyMember;

relation FamilyMember;

keys string[] = family.getKeys();

for(i int from 1 to keys.getSize())

SysLib.writeStdout("----------------------------------------------------");

SysLib.writeStdout(keys[i]);

familyMember = family[keys[i]];

SysLib.writeStdout(familyMember.person.lastName + ", " + familyMember.person.firstName + " - " + familyMember.person.age);

for(j int from 1 to familyMember.relationships.getSize())

id string = familyMember.relationships[j].id;

relation = family[id];

SysLib.writeStdout(familyMember.relationships[j].relationshipType + ": " +

relation.person.lastName + ", " + relation.person.firstName + " - " + relation.person.age);

end

end

</lang>