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Kurt Hutten IrevDev
2022-11-13 11:15:35 +11:00
parent 300e7c4118
commit 24189282ec
4 changed files with 0 additions and 2 deletions
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146
src/lang/abstractSyntaxTree.test.ts Normal file
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import { abstractSyntaxTree } from "./abstractSyntaxTree";
import { lexer } from "./tokeniser";
describe("testing AST", () => {
test("test 5 + 6", () => {
const tokens = lexer("5 +6");
const result = abstractSyntaxTree(tokens);
expect(result).toEqual({
type: "Program",
start: 0,
end: 4,
body: [
{
type: "ExpressionStatement",
start: 0,
end: 4,
expression: {
type: "BinaryExpression",
start: 0,
end: 4,
left: {
type: "Literal",
start: 0,
end: 1,
value: 5,
raw: "5",
},
operator: "+",
right: {
type: "Literal",
start: 3,
end: 4,
value: 6,
raw: "6",
},
},
},
],
});
});
test("test const myVar = 5", () => {
const tokens = lexer("const myVar = 5");
const { body } = abstractSyntaxTree(tokens);
expect(body).toEqual([
{
type: "VariableDeclaration",
start: 0,
end: 15,
kind: "const",
declarations: [
{
type: "VariableDeclarator",
start: 6,
end: 15,
id: {
type: "Identifier",
start: 6,
end: 11,
name: "myVar",
},
init: {
type: "Literal",
start: 14,
end: 15,
value: 5,
raw: "5",
},
},
],
},
]);
});
test("test multi-line", () => {
const code = `const myVar = 5
const newVar = myVar + 1
`;
const tokens = lexer(code);
const { body } = abstractSyntaxTree(tokens);
expect(body).toEqual([
{
type: "VariableDeclaration",
start: 0,
end: 15,
kind: "const",
declarations: [
{
type: "VariableDeclarator",
start: 6,
end: 15,
id: {
type: "Identifier",
start: 6,
end: 11,
name: "myVar",
},
init: {
type: "Literal",
start: 14,
end: 15,
value: 5,
raw: "5",
},
},
],
},
{
type: "VariableDeclaration",
start: 16,
end: 40,
kind: "const",
declarations: [
{
type: "VariableDeclarator",
start: 22,
end: 40,
id: {
type: "Identifier",
start: 22,
end: 28,
name: "newVar",
},
init: {
type: "BinaryExpression",
start: 31,
end: 40,
left: {
type: "Identifier",
start: 31,
end: 36,
name: "myVar",
},
operator: "+",
right: {
type: "Literal",
start: 39,
end: 40,
value: 1,
raw: "1",
},
},
},
],
},
]);
});
});