NativeScript/unit-tests/ui/styling/css-selector.ts

import { assert } from "chai";
import * as parser from "@nativescript/core/css";
import * as selector from "@nativescript/core/ui/styling/css-selector";

describe("ui", () => {
    describe("styling", () => {
        describe("css-selectors", () => {
            describe("match", () => {
                it("button[attr]", () => {
                    const sel = selector.createSelector("button[testAttr]");
                    assert.isTrue(sel.match(<any>{
                        cssType: "button",
                        testAttr: true
                    }));
                    assert.isFalse(sel.match(<any>{
                        cssType: "button"
                    }));
                });

                function create(css: string, source: string = "css-selectors.ts@test"): { rules: selector.RuleSet[], map: selector.SelectorsMap } {
                    let parse = parser.parse(css, { source });
                    let rulesAst = parse.stylesheet.rules.filter(n => n.type === "rule");
                    let rules = selector.fromAstNodes(rulesAst);
                    let map = new selector.SelectorsMap(rules);

                    return { rules, map };
                }
                
                function createOne(css: string, source: string = "css-selectors.ts@test"): selector.RuleSet {
                    let {rules} = create(css, source);
                    assert.equal(rules.length, 1);

                    return rules[0];
                }
                
                it("single selector", () => {
                    let rule = createOne(`* { color: red; }`);
                    assert.isTrue(rule.selectors[0].match({ cssType: "button" }));
                    assert.isTrue(rule.selectors[0].match({ cssType: "image" }));
                });
                
                it("two selectors", () => {
                    let rule = createOne(`button, image { color: red; }`);
                    assert.isTrue(rule.selectors[0].match({ cssType: "button" }));
                    assert.isTrue(rule.selectors[1].match({ cssType: "image" }));
                    assert.isFalse(rule.selectors[0].match({ cssType: "stacklayout" }));
                    assert.isFalse(rule.selectors[1].match({ cssType: "stacklayout" }));
                });
                
                it("narrow selection", () => {
                    let {map} = create(`
                        .login { color: blue; }
                        button { color: red; }
                        image { color: green; }
                    `);
            
                    let buttonQuerry = map.query({ cssType: "button" }).selectors;
                    assert.equal(buttonQuerry.length, 1);
                    assert.includeDeepMembers(buttonQuerry[0].ruleset.declarations, [
                        { property: "color", value: "red" }
                    ]);
                
                    let imageQuerry = map.query({ cssType: "image", cssClasses: new Set(["login"]) }).selectors;
                    assert.equal(imageQuerry.length, 2);
                    // Note class before type
                    assert.includeDeepMembers(imageQuerry[0].ruleset.declarations, [
                        { property: "color", value: "green" }
                    ]);
                    assert.includeDeepMembers(imageQuerry[1].ruleset.declarations, [
                        { property: "color", value: "blue" }
                    ]);
                });
                
                let positiveMatches = {
                    "*": (view) => true,
                    "type": (view) => view.cssType === "type",
                    "#id": (view) => view.id === "id",
                    ".class": (view) => view.cssClasses.has("class"),
                    ":pseudo": (view) => view.cssPseudoClasses.has("pseudo"),
                    "[src1]": (view) => "src1" in view,
                    "[src2='src-value']": (view) => view["src2"] === "src-value"
                };
                
                let positivelyMatchingView = {
                    cssType: "type",
                    id: "id",
                    cssClasses: new Set(["class"]),
                    cssPseudoClasses: new Set(["pseudo"]),
                    "src1": "src",
                    "src2": "src-value"
                };
                
                let negativelyMatchingView = {
                    cssType: "nottype",
                    id: "notid",
                    cssClasses: new Set(["notclass"]),
                    cssPseudoClasses: new Set(["notpseudo"]),
                    // Has no "src1"
                    "src2": "not-src-value"
                };
                
                it("simple selectors match", () => {
                    for (let sel in positiveMatches) {
                        let css = sel + " { color: red; }";
                        let rule = createOne(css);
                        assert.isTrue(rule.selectors[0].match(positivelyMatchingView), "Expected successful match for: " + css);
                        if (sel !== "*") {
                            assert.isFalse(rule.selectors[0].match(negativelyMatchingView), "Expected match failure for: " + css);
                        }
                    }
                });
                
                it("two selector sequence positive match", () => {
                    for (let firstStr in positiveMatches) {
                        for (let secondStr in positiveMatches) {
                            if (secondStr !== firstStr && secondStr !== "*" && secondStr !== "type") {
                                let css = firstStr + secondStr + " { color: red; }";
                                let rule = createOne(css);
                                assert.isTrue(rule.selectors[0].match(positivelyMatchingView), "Expected successful match for: " + css);
                                if (firstStr !== "*") {
                                    assert.isFalse(rule.selectors[0].match(negativelyMatchingView), "Expected match failure for: " + css);
                                }
                            }
                        }
                    }
                });
                
                it("direct parent combinator", () => {
                    let rule = createOne(`listview > item:selected { color: red; }`);
                    assert.isTrue(rule.selectors[0].match({
                        cssType: "item",
                        cssPseudoClasses: new Set(["selected"]),
                        parent: {
                            cssType: "listview"
                        }
                    }), "Item in list view expected to match");
                    assert.isFalse(rule.selectors[0].match({
                        cssType: "item",
                        cssPseudoClasses: new Set(["selected"]),
                        parent: {
                            cssType: "stacklayout",
                            parent: {
                                cssType: "listview"
                            }
                        }
                    }), "Item in stack in list view NOT expected to match.");
                });
                
                it("ancestor combinator", () => {
                    let rule = createOne(`listview item:selected { color: red; }`);
                    assert.isTrue(rule.selectors[0].match({
                        cssType: "item",
                        cssPseudoClasses: new Set(["selected"]),
                        parent: {
                            cssType: "listview"
                        }
                    }), "Item in list view expected to match");
                    assert.isTrue(rule.selectors[0].match({
                        cssType: "item",
                        cssPseudoClasses: new Set(["selected"]),
                        parent: {
                            cssType: "stacklayout",
                            parent: {
                                cssType: "listview"
                            }
                        }
                    }), "Item in stack in list view expected to match.");
                    assert.isFalse(rule.selectors[0].match({
                        cssType: "item",
                        cssPseudoClasses: new Set(["selected"]),
                        parent: {
                            cssType: "stacklayout",
                            parent: {
                                cssType: "page"
                            }
                        }
                    }), "Item in stack in page NOT expected to match.");
                });
                
                it("backtracking css selector", () => {
                    let sel = createOne(`a>b c { color: red; }`).selectors[0];
                    let child = {
                        cssType: "c",
                        parent: {
                            cssType: "b",
                            parent: {
                                cssType: "fail",
                                parent: {
                                    cssType: "b",
                                    parent: {
                                        cssType: "a"
                                    }
                                }
                            }
                        }
                    };

                    assert.isTrue(sel.match(child));
                });

                function toString() { return this.cssType; }

                it("simple query match", () => {
                    let {map} = create(`list grid[promotion] button:highlighted { color: red; }`);

                    let list, grid, button;

                    button = {
                        cssType: "button",
                        cssPseudoClasses: new Set<string>(["highlighted"]),
                        toString,
                        parent: grid = {
                            cssType: "grid",
                            promotion: true,
                            toString,
                            parent: list = {
                                cssType: "list",
                                toString
                            }
                        }
                    };

                    let match = map.query(button);
                    assert.equal(match.selectors.length, 1, "Expected match to have one selector.");

                    let expected = new Map<selector.Node, selector.Changes>()
                        .set(grid, { attributes: new Set(["promotion"]) })
                        .set(button, { pseudoClasses: new Set(["highlighted"]) });

                    assert.deepEqual(match.changeMap, expected);
                });

                it("query match one child group", () => {
                    let {map} = create(`#prod[special] > gridlayout { color: red; }`);
                    let gridlayout, prod;

                    gridlayout = {
                        cssType: "gridlayout",
                        toString,
                        parent: prod = {
                            id: "prod",
                            cssType: "listview",
                            toString
                        }
                    };

                    let match = map.query(gridlayout);
                    assert.equal(match.selectors.length, 1, "Expected match to have one selector.");

                    let expected = new Map<selector.Node, selector.Changes>().set(prod, { attributes: new Set(["special"])} );
                    assert.deepEqual(match.changeMap, expected);
                });

                it("query match one sibling group (deepEqual does not compare Map?)", () => {
                    let {map} = create(`list button:highlighted+button:disabled { color: red; }`);
                    let list, button, disabledButton;

                    list = {
                        cssType: "list",
                        toString,
                        getChildIndex: () => 1,
                        getChildAt: () => button
                    };

                    button = {
                        cssType: "button",
                        cssPseudoClasses: new Set<string>(["highlighted"]),
                        toString,
                        parent: list
                    };

                    disabledButton = {
                        cssType: "button",
                        cssPseudoClasses: new Set<string>(["disabled"]),
                        toString,
                        parent: list
                    };

                    let match = map.query(disabledButton);
                    assert.equal(match.selectors.length, 1, "Expected match to have one selector.");

                    let expected = new Map<selector.Node, selector.Changes>()
                        .set(disabledButton, { pseudoClasses: new Set(["disabled"]) })
                        .set(button, { pseudoClasses: new Set(["highlighted"]) });

                    assert.deepEqual(match.changeMap, expected);
                });
            });
        });
    });
});