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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
import CodeMirror from "codemirror";
import { getExpressionFromCoords } from "../get-expression";
describe("get-expression", () => {
let isCreateTextRangeDefined;
beforeAll(() => {
if (document.body.createTextRange) {
isCreateTextRangeDefined = true;
} else {
isCreateTextRangeDefined = false;
// CodeMirror needs createTextRange
// https://discuss.codemirror.net/t/working-in-jsdom-or-node-js-natively/138/5
document.body.createTextRange = () => ({
getBoundingClientRect: jest.fn(),
getClientRects: () => ({}),
});
}
});
afterAll(() => {
if (!isCreateTextRangeDefined) {
delete document.body.createTextRange;
}
});
describe("getExpressionFromCoords", () => {
it("returns null when location.line is greater than the lineCount", () => {
const cm = CodeMirror(document.body, {
value: "let Line1;\n" + "let Line2;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 3,
column: 1,
});
expect(result).toBeNull();
});
it("gets the expression using CodeMirror.getTokenAt", () => {
const codemirrorMock = {
lineCount: () => 100,
getTokenAt: jest.fn(() => ({ start: 0, end: 0 })),
doc: {
getLine: () => "",
},
};
getExpressionFromCoords(codemirrorMock, { line: 1, column: 1 });
expect(codemirrorMock.getTokenAt).toHaveBeenCalled();
});
it("requests the correct line and column from codeMirror", () => {
const codemirrorMock = {
lineCount: () => 100,
getTokenAt: jest.fn(() => ({ start: 0, end: 1 })),
doc: {
getLine: jest.fn(() => ""),
},
};
getExpressionFromCoords(codemirrorMock, { line: 20, column: 5 });
// getExpressionsFromCoords uses one based line indexing
// CodeMirror uses zero based line indexing
expect(codemirrorMock.getTokenAt).toHaveBeenCalledWith({
line: 19,
ch: 5,
});
expect(codemirrorMock.doc.getLine).toHaveBeenCalledWith(19);
});
it("when called with column 0 returns null", () => {
const cm = CodeMirror(document.body, {
value: "foo bar;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 1,
column: 0,
});
expect(result).toBeNull();
});
it("gets the expression when first token on the line", () => {
const cm = CodeMirror(document.body, {
value: "foo bar;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 1,
column: 1,
});
if (!result) {
throw new Error("no result");
}
expect(result.expression).toEqual("foo");
expect(result.location.start).toEqual({ line: 1, column: 0 });
expect(result.location.end).toEqual({ line: 1, column: 3 });
});
it("includes previous tokens in the expression", () => {
const cm = CodeMirror(document.body, {
value: "foo.bar;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 1,
column: 5,
});
if (!result) {
throw new Error("no result");
}
expect(result.expression).toEqual("foo.bar");
expect(result.location.start).toEqual({ line: 1, column: 0 });
expect(result.location.end).toEqual({ line: 1, column: 7 });
});
it("includes multiple previous tokens in the expression", () => {
const cm = CodeMirror(document.body, {
value: "foo.bar.baz;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 1,
column: 10,
});
if (!result) {
throw new Error("no result");
}
expect(result.expression).toEqual("foo.bar.baz");
expect(result.location.start).toEqual({ line: 1, column: 0 });
expect(result.location.end).toEqual({ line: 1, column: 11 });
});
it("does not include tokens not part of the expression", () => {
const cm = CodeMirror(document.body, {
value: "foo bar.baz;\n",
mode: "javascript",
});
const result = getExpressionFromCoords(cm, {
line: 1,
column: 10,
});
if (!result) {
throw new Error("no result");
}
expect(result.expression).toEqual("bar.baz");
expect(result.location.start).toEqual({ line: 1, column: 4 });
expect(result.location.end).toEqual({ line: 1, column: 11 });
});
});
});
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