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const assert = require('assert');
const { createLexer } = require('../src/core/lexer');
const { createParser } = require('../src/core/parser');
const { createInterpreter } = require('../src/core/interpreter');
describe('Language Features', () => {
function interpret(code) {
const lexer = createLexer(code);
const tokens = lexer.allTokens();
const parser = createParser(tokens);
const ast = parser.parse();
const interpreter = createInterpreter(ast);
interpreter.interpret();
return interpreter;
}
describe('Mathematical Constants', () => {
it('should correctly handle PI constant', () => {
const code = 'result : PI;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, Math.PI);
assert.strictEqual(result.isFloat, true);
});
it('should correctly handle INFINITY constant', () => {
const code = 'result : INFINITY;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, Infinity);
assert.strictEqual(result.isFloat, true);
});
it('should use constants in expressions', () => {
const code = 'result : 2 * PI;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 2 * Math.PI);
});
});
describe('Immutable List Operations', () => {
it('should correctly append to lists', () => {
const code = `
original : [1, 2, 3];
result : append original 4;
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.deepStrictEqual(original.map(item => item.value), [1, 2, 3]);
assert.deepStrictEqual(result.map(item => item.value), [1, 2, 3, 4]);
});
it('should correctly prepend to lists', () => {
const code = `
original : [1, 2, 3];
result : prepend 0 original;
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.deepStrictEqual(original.map(item => item.value), [1, 2, 3]);
assert.deepStrictEqual(result.map(item => item.value), [0, 1, 2, 3]);
});
it('should correctly concatenate lists', () => {
const code = `
list1 : [1, 2];
list2 : [3, 4];
result : concat list1 list2;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.deepStrictEqual(result.map(item => item.value), [1, 2, 3, 4]);
});
it('should correctly update list elements', () => {
const code = `
original : [1, 2, 3];
result : update original 1 99;
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.deepStrictEqual(original.map(item => item.value), [1, 2, 3]);
assert.deepStrictEqual(result.map(item => item.value), [1, 99, 3]);
});
it('should correctly remove elements from lists', () => {
const code = `
original : [1, 2, 3];
result : removeAt original 1;
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.deepStrictEqual(original.map(item => item.value), [1, 2, 3]);
assert.deepStrictEqual(result.map(item => item.value), [1, 3]);
});
it('should correctly slice lists', () => {
const code = `
original : [1, 2, 3, 4, 5];
result : slice original 1 4;
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.deepStrictEqual(original.map(item => item.value), [1, 2, 3, 4, 5]);
assert.deepStrictEqual(result.map(item => item.value), [2, 3, 4]);
});
});
describe('Immutable Table Operations', () => {
it('should correctly set table properties', () => {
const code = `
original : {name: "Alice", age: 30};
result : set original "city" "NYC";
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.strictEqual(original.properties.get('name'), 'Alice');
assert.strictEqual(original.properties.get('age').value, 30);
assert.strictEqual(result.properties.get('name'), 'Alice');
assert.strictEqual(result.properties.get('age').value, 30);
assert.strictEqual(result.properties.get('city'), 'NYC');
});
it('should correctly remove table properties', () => {
const code = `
original : {name: "Alice", age: 30};
result : remove original "age";
`;
const interpreter = interpret(code);
const original = interpreter.scope.get('original');
const result = interpreter.scope.get('result');
assert.strictEqual(original.properties.get('name'), 'Alice');
assert.strictEqual(original.properties.get('age').value, 30);
assert.strictEqual(result.properties.get('name'), 'Alice');
assert.strictEqual(result.properties.has('age'), false);
});
it('should correctly merge tables', () => {
const code = `
table1 : {name: "Alice", age: 30};
table2 : {city: "NYC", country: "USA"};
result : merge table1 table2;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.properties.get('name'), 'Alice');
assert.strictEqual(result.properties.get('age').value, 30);
assert.strictEqual(result.properties.get('city'), 'NYC');
assert.strictEqual(result.properties.get('country'), 'USA');
});
it('should correctly get table keys', () => {
const code = `
table : {name: "Alice", age: 30};
result : keys table;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.deepStrictEqual(result, ['name', 'age']);
});
it('should correctly get table values', () => {
const code = `
table : {name: "Alice", age: 30};
result : values table;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result[0], 'Alice');
assert.strictEqual(result[1].value, 30);
});
});
describe('String Operations', () => {
it('should correctly concatenate strings', () => {
const code = 'result : str.concat "Hello" " " "World";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'Hello World');
});
it('should correctly split strings', () => {
const code = 'result : str.split "a,b,c" ",";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.deepStrictEqual(result, ['a', 'b', 'c']);
});
it('should correctly join lists into strings', () => {
const code = 'result : str.join ["a", "b", "c"] "-";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'a-b-c');
});
it('should correctly get string length', () => {
const code = 'result : str.length "hello";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 5);
});
it('should correctly get substrings', () => {
const code = 'result : str.substring "hello world" 0 5;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'hello');
});
it('should correctly replace substrings', () => {
const code = 'result : str.replace "hello hello" "hello" "hi";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'hi hi');
});
it('should correctly trim strings', () => {
const code = 'result : str.trim " hello ";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'hello');
});
it('should correctly convert to uppercase', () => {
const code = 'result : str.upper "hello";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'HELLO');
});
it('should correctly convert to lowercase', () => {
const code = 'result : str.lower "HELLO";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'hello');
});
});
describe('Type Declarations and Type Checking', () => {
it('should correctly handle type declarations', () => {
const code = `
myNumber Int;
myNumber : 42;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('myNumber');
assert.strictEqual(result.value, 42);
});
it('should correctly handle type checking in when expressions', () => {
const code = `
checkType : val ->
when val is
Int then "Integer"
String then "String"
Bool then "Boolean"
_ then "Other";
result1 : checkType 42;
result2 : checkType "hello";
result3 : checkType true;
`;
const interpreter = interpret(code);
assert.strictEqual(interpreter.scope.get('result1'), 'Integer');
assert.strictEqual(interpreter.scope.get('result2'), 'String');
assert.strictEqual(interpreter.scope.get('result3'), 'Boolean');
});
});
describe('Result Type', () => {
it('should correctly create Ok results', () => {
const code = 'result : Ok 42;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.type, 'Result');
assert.strictEqual(result.variant, 'Ok');
assert.strictEqual(result.value.value, 42);
});
it('should correctly create Err results', () => {
const code = 'result : Err "error message";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.type, 'Result');
assert.strictEqual(result.variant, 'Err');
assert.strictEqual(result.value, 'error message');
});
it('should correctly pattern match on Result types', () => {
const code = `
divide : x y ->
when y is
0 then Err "Division by zero"
_ then Ok (x / y);
result1 : when (divide 10 2) is
Ok value then value
Err msg then 0;
result2 : when (divide 10 0) is
Ok value then value
Err msg then msg;
`;
const interpreter = interpret(code);
const result1 = interpreter.scope.get('result1');
const result2 = interpreter.scope.get('result2');
assert.strictEqual(result1.value, 5);
assert.strictEqual(result2, 'Division by zero');
});
});
describe('Operators', () => {
it('should correctly handle unary negation', () => {
const code = 'result : -5;';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, -5);
});
it('should correctly handle string concatenation with ..', () => {
const code = 'result : "Hello" .. " " .. "World";';
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result, 'Hello World');
});
it('should correctly handle comparison operators', () => {
const code = `
result1 : 5 > 3;
result2 : 5 < 3;
result3 : 5 >= 5;
result4 : 5 <= 3;
result5 : 5 = 5;
`;
const interpreter = interpret(code);
assert.strictEqual(interpreter.scope.get('result1'), true);
assert.strictEqual(interpreter.scope.get('result2'), false);
assert.strictEqual(interpreter.scope.get('result3'), true);
assert.strictEqual(interpreter.scope.get('result4'), false);
assert.strictEqual(interpreter.scope.get('result5'), true);
});
it('should correctly handle modulo operator', () => {
const code = `
result1 : 10 % 3;
result2 : 15 % 4;
result3 : 7 % 2;
`;
const interpreter = interpret(code);
assert.strictEqual(interpreter.scope.get('result1').value, 1);
assert.strictEqual(interpreter.scope.get('result2').value, 3);
assert.strictEqual(interpreter.scope.get('result3').value, 1);
});
});
describe('Curried Functions and Partial Application', () => {
it('should correctly handle curried functions', () => {
const code = `
add : x -> y -> x + y;
add5 : add 5;
result : add5 3;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 8);
});
it('should correctly handle partial application', () => {
const code = `
multiply : x -> y -> x * y;
double : multiply 2;
result : double 7;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 14);
});
});
describe('Anonymous Functions', () => {
it('should correctly handle anonymous functions', () => {
const code = `
result : (x -> x * 2) 5;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 10);
});
it('should correctly handle anonymous functions with multiple parameters', () => {
const code = `
result : (x y -> x + y) 3 4;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 7);
});
});
describe('Function Calls', () => {
it('should correctly handle parenthesized function calls', () => {
const code = `
add : x y -> x + y;
result : (add 3 4);
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 7);
});
it('should correctly handle non-parenthesized function calls', () => {
const code = `
add : x y -> x + y;
result : add 3 4;
`;
const interpreter = interpret(code);
const result = interpreter.scope.get('result');
assert.strictEqual(result.value, 7);
});
});
describe('Error Handling', () => {
it('should handle division by zero', () => {
const code = 'result : 10 / 0;';
assert.throws(() => interpret(code), /Division by zero/);
});
it('should handle index out of bounds', () => {
const code = 'result : [1, 2, 3].5;';
assert.throws(() => interpret(code), /Index out of bounds/);
});
it('should handle undefined variables', () => {
const code = 'result : undefinedVar;';
assert.throws(() => interpret(code), /Undefined variable/);
});
it('should handle undefined properties', () => {
const code = 'result : {name: "Alice"}.age;';
assert.throws(() => interpret(code), /Undefined property/);
});
});
});
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