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test_parser.lua
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test_parser.lua
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require("utilstests")
require 'busted.runner'()
describe("A parser", function()
describe("should parse", function()
it("let statements", function()
local tests = {
{ "let x = 5;", "x", 5 },
{ "let y = true;", "y", true },
{ "let foobar = y;", "foobar", "y" },
}
ForEachTests(tests, 3, function(input, expectedIdentifier, expectedValue)
local program = CreateProgram(input)
CountStatement(1, program, assert)
local statement = program.statements[1]
AssertLetStatement(statement, expectedIdentifier, assert)
local value = statement.value
AssertLiteralExpression(value, expectedValue, assert)
end)
end)
it("return statements", function()
local tests = {
{ "return 5;", 5 },
{ "return true;", true },
{ "return foobar;", "foobar" }
}
ForEachTests(tests, 2, function(input, expectedIdentifier)
local program = CreateProgram(input)
CountStatement(1, program, assert)
local statement = program.statements[1]
assert.are.same("return", statement:getTokenLiteral())
AssertLiteralExpression(statement.returnValue, expectedIdentifier, assert)
end)
end)
it("identifier expression", function()
local input = "foobar;"
local program = CreateProgram(input)
CountStatement(1, program, assert)
local statement = program.statements[1]
local identifier = statement.expression
assert.are.same("foobar", identifier.value)
assert.are.same("foobar", identifier:getTokenLiteral())
end)
it("integer literals", function()
local input = "5;"
local program = CreateProgram(input)
CountStatement(1, program, assert)
local statement = program.statements[1]
local expression = statement.expression
if expression:is(IntegerLiteral) then
assert.are.same(5, expression.value)
assert.are.same("5", expression:getTokenLiteral())
else
error(string.format("statement.expression not IntegerLiteral. got=%s", tostring(statement)))
end
end)
it("prefix expression", function()
local tests = {
{ "!5;", "!", 5 },
{ "-15;", "-", 15 },
{ "!true;", "!", true },
{ "!false;", "!", false },
}
ForEachTests(tests, 3, function(input, operator, value)
local program = CreateProgram(input)
CountStatement(1, program, assert)
local statement = program.statements[1]
local expression = statement.expression
assert.are.same(operator, expression.operator)
AssertLiteralExpression(expression.right, value, assert)
end)
end)
it("infix expressions", function()
local tests = {
{ "5 + 5;", 5, "+", 5 },
{ "5 - 5;", 5, "-", 5 },
{ "5 * 5;", 5, "*", 5 },
{ "5 / 5;", 5, "/", 5 },
{ "5 > 5;", 5, ">", 5 },
{ "5 < 5;", 5, "<", 5 },
{ "5 == 5;", 5, "==", 5 },
{ "5 != 5;", 5, "!=", 5 },
{ "true == true", true, "==", true },
{ "true != false", true, "!=", false },
{ "false == false", false, "==", false },
}
ForEachTests(tests, 4, function(input, leftValue, operator, rightValue)
local program = CreateProgram(input)
CountStatement(1, program, assert)
AssertInfixExpression(program.statements[1].expression, leftValue, operator, rightValue, assert)
end)
end)
it("operator precedence", function()
local tests = {
{
"-a * b",
"((-a) * b)",
},
{
"!-a",
"(!(-a))",
},
{
"a + b + c",
"((a + b) + c)",
},
{
"a + b - c",
"((a + b) - c)",
},
{
"a * b * c",
"((a * b) * c)",
},
{
"a * b / c",
"((a * b) / c)",
},
{
"a + b / c",
"(a + (b / c))",
},
{
"a + b * c + d / e - f",
"(((a + (b * c)) + (d / e)) - f)",
},
{
"3 + 4; -5 * 5",
"(3 + 4)((-5) * 5)",
},
{
"5 > 4 == 3 < 4",
"((5 > 4) == (3 < 4))",
},
{
"5 < 4 != 3 > 4",
"((5 < 4) != (3 > 4))",
},
{
"3 + 4 * 5 == 3 * 1 + 4 * 5",
"((3 + (4 * 5)) == ((3 * 1) + (4 * 5)))",
},
{
"true",
"true",
},
{
"false",
"false",
},
{
"3 > 5 == false",
"((3 > 5) == false)",
},
{
"3 < 5 == true",
"((3 < 5) == true)",
},
{
"1 + (2 + 3) + 4",
"((1 + (2 + 3)) + 4)",
},
{
"(5 + 5) * 2",
"((5 + 5) * 2)",
},
{
"2 / (5 + 5)",
"(2 / (5 + 5))",
},
{
"(5 + 5) * 2 * (5 + 5)",
"(((5 + 5) * 2) * (5 + 5))",
},
{
"-(5 + 5)",
"(-(5 + 5))",
},
{
"!(true == true)",
"(!(true == true))",
},
{
"a + add(b * c) + d",
"((a + add((b * c))) + d)",
},
{
"add(a, b, 1, 2 * 3, 4 + 5, add(6, 7 * 8))",
"add(a, b, 1, (2 * 3), (4 + 5), add(6, (7 * 8)))",
},
{
"add(a + b + c * d / f + g)",
"add((((a + b) + ((c * d) / f)) + g))",
},
{
"a * [1, 2, 3, 4][b * c] * d",
"((a * ([1, 2, 3, 4][(b * c)])) * d)",
},
{
"add(a * b[2], b[1], 2 * [1, 2][1])",
"add((a * (b[2])), (b[1]), (2 * ([1, 2][1])))",
},
}
ForEachTests(tests, 2, function(input, expected)
local program = CreateProgram(input)
assert.are.same(expected, tostring(program))
end)
end)
it("boolean expression", function()
local tests = {
{ "true", true },
{ "false", false }
}
ForEachTests(tests, 2, function(input, expected)
local program = CreateProgram(input)
CountStatement(1, program, assert)
local booleanLiteral = program.statements[1].expression
assert.are.same(expected, booleanLiteral.value)
end)
end)
local function assertIfExpression(input)
local program = CreateProgram(input)
CountStatement(1, program, assert)
local exp = program.statements[1].expression
AssertInfixExpression(exp.condition, "x", "<", "y", assert)
assert.are.same(1, Len(exp.consequence.statements))
local consequence = exp.consequence.statements[1]
AssertIdentifier(consequence.expression, "x", assert)
return exp
end
it("if expression", function()
local input = "if (x < y) { x }"
local exp = assertIfExpression(input)
assert.are.same(nil, exp.alternative)
end)
it("if else expression", function()
local input = "if (x < y) { x } else { y }"
local exp = assertIfExpression(input)
assert.are.same(1, Len(exp.alternative.statements))
local alternative = exp.alternative.statements[1]
AssertIdentifier(alternative.expression, "y", assert)
end)
it("function literal", function()
local input = "fn(x, y) { x + y;}"
local program = CreateProgram(input)
CountStatement(1, program, assert)
local fun = program.statements[1].expression
AssertLiteralExpression(fun.parameters[1], "x", assert)
AssertLiteralExpression(fun.parameters[2], "y", assert)
assert.are.same(1, Len(fun.body.statements))
AssertInfixExpression(fun.body.statements[1].expression, "x", "+", "y", assert)
end)
it("function parameters", function()
local tests = {
{ "fn(){}", {} },
{ "fn(x){}", { "x" } },
{ "fn(x, y , z){}", { "x", "y", "z" } },
}
ForEachTests(tests, 2, function(input, expectedParams)
local program = CreateProgram(input)
local fun = program.statements[1].expression
assert.are.same(Len(expectedParams), Len(fun.parameters))
ForEachIndexed(expectedParams, function(i, param)
AssertLiteralExpression(fun.parameters[i], param, assert)
end)
end)
end)
it("call expression", function()
local input = "add(1, 2 * 3, 4+5)"
local program = CreateProgram(input)
CountStatement(1, program, assert)
local exp = program.statements[1].expression
AssertIdentifier(exp.expression, "add", assert)
assert.are.same(3, Len(exp.arguments))
AssertLiteralExpression(exp.arguments[1], 1, assert)
AssertInfixExpression(exp.arguments[2], 2, "*", 3, assert)
AssertInfixExpression(exp.arguments[3], 4, "+", 5, assert)
end)
it("literal expression", function()
local input = '"hello world";'
local program = CreateProgram(input)
CountStatement(1, program, assert)
assert.are.same("hello world", program.statements[1].expression.value)
end)
it("array literal", function()
local input = "[1, 2 * 2, 3 + 3]"
local program = CreateProgram(input)
local array = program.statements[1].expression
AssertIntegerLiteral(array.elements[1], 1, assert)
AssertInfixExpression(array.elements[2], 2, "*", 2, assert)
AssertInfixExpression(array.elements[3], 3, "+", 3, assert)
end)
it("parsing index expression", function()
local input = "myArray[1 + 1]"
local program = CreateProgram(input)
local index = program.statements[1].expression
AssertIdentifier(index.left, "myArray", assert)
AssertInfixExpression(index.index, 1, "+", 1, assert)
end)
it("hash string keys", function()
local input = '{"one": 1, "two": 2, "three": 3}'
local program = CreateProgram(input)
local hashLiteral = program.statements[1].expression
assert.are.same(3, Len(hashLiteral.entries))
local expected = { one = 1, two = 2, three = 3 }
for key, value in pairs(hashLiteral.entries) do
local expectedValue = expected[tostring(key)]
AssertLiteralExpression(value, expectedValue, assert)
end
end)
end)
end)