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ParserTests.swift
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ParserTests.swift
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//
// ParserTests.swift
//
// Created by Tomasz Kucharski on 04/10/2021.
//
import XCTest
@testable import ScriptInterpreter
class ParserTests: XCTestCase {
func test_callingExternalFunctionWithoutArgs() throws {
let spy = self.setupSpy(code: "increaseCounter()")
XCTAssertEqual(spy.callCounter, 1)
}
func test_callingTwoExternalFunctions() throws {
let spy = self.setupSpy(code: "increaseCounter() addTwo()")
XCTAssertEqual(spy.callCounter, 3)
}
func test_callExternalFunctionWithArguments() {
let spy = self.setupSpy(code: "print(true, 20, 'works', 3.14)")
XCTAssertEqual(spy.output.count, 4)
XCTAssertEqual(spy.output[safeIndex: 0], .bool(true))
XCTAssertEqual(spy.output[safeIndex: 1], .integer(20))
XCTAssertEqual(spy.output[safeIndex: 2], .string("works"))
XCTAssertEqual(spy.output[safeIndex: 3], .float(3.14))
}
func test_callExternalFunctionWithVariableValue() {
let spy = self.setupSpy(code: "var number = 55; print(number);")
XCTAssertEqual(spy.output.count, 1)
XCTAssertEqual(spy.output[safeIndex: 0], .integer(55))
}
func test_ifElseStatementTrue() {
let spy = self.setupSpy(code: "var execute = true; if(execute) { print(20) } else { print(21); }")
XCTAssertEqual(spy.output.count, 1)
XCTAssertEqual(spy.output[safeIndex: 0], .integer(20))
}
func test_ifElseStatementFalse() {
let spy = self.setupSpy(code: "var execute = false; if(execute) { print(20) } else { print(21, 22); }")
XCTAssertEqual(spy.output.count, 2)
XCTAssertEqual(spy.output[safeIndex: 0], .integer(21))
XCTAssertEqual(spy.output[safeIndex: 1], .integer(22))
}
func test_variableNamespaceIfStatement() {
let spy = self.setupSpy(code: "var execute = true; var amount = 5 ; if(execute) { print(amount) } else { print(21); }")
XCTAssertEqual(spy.output.count, 1)
XCTAssertEqual(spy.output[safeIndex: 0], .integer(5))
}
func test_variableNamespaceElseStatement() {
let spy = self.setupSpy(code: "var execute = false; var amount = 5 ; if(execute) { print(50) } else { print(amount); }")
XCTAssertEqual(spy.output.count, 1)
XCTAssertEqual(spy.output[safeIndex: 0], .integer(5))
}
func test_variableLocalNamespace() {
let spy = self.setupSpy(code: "var execute = true; var amount = 5 ; if(execute) { let amount = false; print(amount) } print(amount);")
XCTAssertEqual(spy.output.count, 2)
XCTAssertEqual(spy.output[safeIndex: 0], .bool(false))
XCTAssertEqual(spy.output[safeIndex: 1], .integer(5))
}
func test_sampleProgram() {
let spy = self.setupSpy(code: "print(\"hello\"); print(\"world\"); var counter = 9; if ( counter == 9 ) { print('ok') } else { print('wrong') }")
XCTAssertEqual(spy.output.count, 3)
XCTAssertEqual(spy.output[safeIndex: 0], .string("hello"))
XCTAssertEqual(spy.output[safeIndex: 1], .string("world"))
XCTAssertEqual(spy.output[safeIndex: 2], .string("ok"))
let console = self.setupSpy(code: "var counter = 12; if ( counter == 9 ) { print('the same') } else { print('different') }")
XCTAssertEqual(console.output.count, 1)
XCTAssertEqual(console.output[safeIndex: 0], .string("different"))
}
func test_assignVariable() {
let console = self.setupSpy(code: "var age = 40; print(age); age = 50; print(age);")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(40))
XCTAssertEqual(console.output[safeIndex: 1], .integer(50))
let console2 = self.setupSpy(code: "var min = 10; var max = 100; var current = 50; print(current); current = min; print(current);")
XCTAssertEqual(console2.output.count, 2)
XCTAssertEqual(console2.output[safeIndex: 0], .integer(50))
XCTAssertEqual(console2.output[safeIndex: 1], .integer(10))
}
func test_variableIncrement() {
let console = self.setupSpy(code: "var distance = 9; print(distance); distance++; print(distance)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(9))
XCTAssertEqual(console.output[safeIndex: 1], .integer(10))
}
func test_variableDecrement() {
let console = self.setupSpy(code: "var distance = 9; print(distance); distance--; print(distance)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(9))
XCTAssertEqual(console.output[safeIndex: 1], .integer(8))
}
func test_whileLoop() {
let console = self.setupSpy(code: "var i = 0; while(i < 5) { i++; print(i) }")
XCTAssertEqual(console.output.count, 5)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 4], .integer(5))
}
func test_breakWhileLoop() {
let console = self.setupSpy(code: "var i = 0; while(i <= 5) { i++; print(i) if(i==2){ break } } print(3.14)")
XCTAssertEqual(console.output.count, 3)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 1], .integer(2))
XCTAssertEqual(console.output[safeIndex: 2], .float(3.14))
}
func test_returnWhileLoop() {
let console = self.setupSpy(code: "var i = 0; while(i <= 5) { i++; print(i) if(i==2){ return } } print(3.14)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 1], .integer(2))
}
func test_forLoop() {
let console = self.setupSpy(code: "var i = 9; for(var i = 1; i <= 5; i++) { print(i) } print(i)")
XCTAssertEqual(console.output.count, 6)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 4], .integer(5))
XCTAssertEqual(console.output[safeIndex: 5], .integer(9))
}
func test_breakInForLoop() {
let console = self.setupSpy(code: "for(var i = 1; i <= 5; i++) { print(i) if(i==2){break} } print(10)")
XCTAssertEqual(console.output.count, 3)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 1], .integer(2))
XCTAssertEqual(console.output[safeIndex: 2], .integer(10))
}
func test_returnFromForLoop() {
let console = self.setupSpy(code: "for(var i = 1; i <= 5; i++) { print(i) if(i==2){return} } print(10)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 1], .integer(2))
}
func test_namespaceVariables() {
let console = self.setupSpy(code: "var number = 0; print(number) { var number = 6; print(number) number--; print(number) } number++; print(number)")
XCTAssertEqual(console.output.count, 4)
XCTAssertEqual(console.output[safeIndex: 0], .integer(0))
XCTAssertEqual(console.output[safeIndex: 1], .integer(6))
XCTAssertEqual(console.output[safeIndex: 2], .integer(5))
XCTAssertEqual(console.output[safeIndex: 3], .integer(1))
}
func test_deferInFunction() {
let console = self.setupSpy(code: "func test() { print('start') defer{ print('deferred') } defer{ print('second-deferred') } print('middle') print('finish') } test()")
XCTAssertEqual(console.output.count, 5)
XCTAssertEqual(console.output[safeIndex: 0], .string("start"))
XCTAssertEqual(console.output[safeIndex: 1], .string("middle"))
XCTAssertEqual(console.output[safeIndex: 2], .string("finish"))
XCTAssertEqual(console.output[safeIndex: 3], .string("second-deferred"))
XCTAssertEqual(console.output[safeIndex: 4], .string("deferred"))
}
func test_updateConstant() {
self.expectError(code: "let pi = 3.14; pi = 5.5")
}
func test_callThrowingFunction() {
self.expectError(code: "let pi = 3.14; error()")
}
func test_returnLiteralValue() {
do {
let lexer = try Lexer(code: "return 32")
let parser = Parser(tokens: lexer.tokens)
let result = try parser.execute()
XCTAssertEqual(result, .return(.integer(32)))
} catch {
XCTFail(error.localizedDescription)
}
}
func test_returnedValueInterpolation() {
do {
let lexer = try Lexer(code: "let distance = 89; var speed = 51; speed = 38; return 'Car travelled \\(distance) with \\(speed) speed'")
let parser = Parser(tokens: lexer.tokens)
let result = try parser.execute()
XCTAssertEqual(result, .return(.string("Car travelled 89 with 38 speed")))
} catch {
XCTFail(error.localizedDescription)
}
}
func test_returnVariable() {
do {
let lexer = try Lexer(code: "let pi = 3.14; return pi")
let parser = Parser(tokens: lexer.tokens)
let result = try parser.execute()
XCTAssertEqual(result, .return(.float(3.14)))
} catch {
XCTFail(error.localizedDescription)
}
}
func test_returnLiteral() {
do {
let lexer = try Lexer(code: "return 8")
let parser = Parser(tokens: lexer.tokens)
let result = try parser.execute()
XCTAssertEqual(result, .return(.integer(8)))
} catch {
XCTFail(error.localizedDescription)
}
}
func test_usingVariableNamesBeginningWithKeywordName() {
let console = self.setupSpy(code: "var ifer = 3; var breaker = 10; var elser = 20; var whiler = 9 print(ifer, breaker, elser)")
XCTAssertEqual(console.output[safeIndex: 0], .integer(3))
XCTAssertEqual(console.output[safeIndex: 1], .integer(10))
XCTAssertEqual(console.output[safeIndex: 2], .integer(20))
}
func test_defineFunctionWithoutArguments() {
let console = self.setupSpy(code: "var number = 0; func welcome(){ var number = 5; print(5) } welcome() print(number)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(5))
XCTAssertEqual(console.output[safeIndex: 1], .integer(0))
}
func test_defineFunctionWitArguments() {
let console = self.setupSpy(code: "var number = 0; func dump(a, b){ var number = 3; print(a, b, number) } dump(1, 2) print(number)")
XCTAssertEqual(console.output.count, 4)
XCTAssertEqual(console.output[safeIndex: 0], .integer(1))
XCTAssertEqual(console.output[safeIndex: 1], .integer(2))
XCTAssertEqual(console.output[safeIndex: 2], .integer(3))
XCTAssertEqual(console.output[safeIndex: 3], .integer(0))
}
func test_updateGlobalVariableInFunction() {
let console = self.setupSpy(code: "var number = 0; func updateNumber(newVal){ number = newVal; } updateNumber(8) print(number)")
XCTAssertEqual(console.output.count, 1)
XCTAssertEqual(console.output[safeIndex: 0], .integer(8))
}
func test_assignFunctionReturnValueToVariable() {
let console = self.setupSpy(code: "var distance = 4 func getValue(){ return 8 } distance = getValue() print(distance)")
XCTAssertEqual(console.output.count, 1)
XCTAssertEqual(console.output[safeIndex: 0], .integer(8))
}
func test_executionAbort() {
do {
let spy = FunctionCallSpy()
let functionRegistry = ExternalFunctionRegistry()
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "print", function: spy.print))
let lexer = try Lexer(code: "var counter = 0; while(true){ counter++ print(counter)}")
let parser = Parser(tokens: lexer.tokens, externalFunctionRegistry: functionRegistry)
DispatchQueue.global().asyncAfter(deadline: .now() + 0.005) {
parser.abort(reason: "Execution timeout")
}
XCTAssertThrowsError(try parser.execute())
XCTAssertTrue(spy.output.count > 0)
} catch {
XCTFail(error.localizedDescription)
}
}
func test_switchStatementSomeCase() {
let console = self.setupSpy(code: "var number = 10; switch number { case 3: print(3) case 10: print(10) default: print(33) } print(21)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(10))
XCTAssertEqual(console.output[safeIndex: 1], .integer(21))
}
func test_switchStatementDefault() {
let console = self.setupSpy(code: "var number = 10; switch number { case 3: print(3) case 11: print(10) default: print(33) } print(21)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(33))
XCTAssertEqual(console.output[safeIndex: 1], .integer(21))
}
func test_switchStatementControlVariableAsFunctionWithoutArguments() {
let console = self.setupSpy(code: "func control() { return 3 } switch control() { case 3: print(3) case 11: print(10) default: print(33) } print(21)")
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(3))
XCTAssertEqual(console.output[safeIndex: 1], .integer(21))
}
func test_updateClassAttribute() throws {
let code = """
class Computer {
var ram = 128
}
let computer = Computer()
print(computer.ram)
computer.ram = 256
print(computer.ram)
"""
let console = self.setupSpy(code: code)
XCTAssertEqual(console.output.count, 2)
XCTAssertEqual(console.output[safeIndex: 0], .integer(128))
XCTAssertEqual(console.output[safeIndex: 1], .integer(256))
}
private func setupSpy(code: String) -> FunctionCallSpy {
let spy = FunctionCallSpy()
let functionRegistry = ExternalFunctionRegistry()
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "print", function: spy.print))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "increaseCounter", function: spy.increaseCounter))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "addTwo", function: spy.addTwo))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "error", function: spy.error))
do {
let lexer = try Lexer(code: code)
let parser = Parser(tokens: lexer.tokens, externalFunctionRegistry: functionRegistry)
XCTAssertNoThrow(try parser.execute())
} catch {
XCTFail(error.localizedDescription)
}
return spy
}
private func expectError(code: String) {
let spy = FunctionCallSpy()
let functionRegistry = ExternalFunctionRegistry()
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "print", function: spy.print))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "increaseCounter", function: spy.increaseCounter))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "addTwo", function: spy.addTwo))
XCTAssertNoThrow(try functionRegistry.registerFunc(name: "error", function: spy.error))
do {
let lexer = try Lexer(code: code)
let parser = Parser(tokens: lexer.tokens, externalFunctionRegistry: functionRegistry)
XCTAssertThrowsError(try parser.execute())
} catch {
XCTFail(error.localizedDescription)
}
}
}
fileprivate class FunctionCallSpy {
var callCounter = 0
var output: [Value] = []
func increaseCounter() {
self.callCounter += 1
}
func addTwo() {
self.callCounter += 2
}
func print(_ data: [Value]) {
self.output.append(contentsOf: data)
}
func error() throws {
throw ParserError.syntaxError(description: "TestError")
}
}