/
code-path.js
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/
code-path.js
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/**
* @fileoverview Tests for CodePath.
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const assert = require("assert"),
{ Linter } = require("../../../../lib/linter");
const linter = new Linter();
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Gets the code path of a given source code.
* @param {string} code A source code.
* @returns {CodePath[]} A list of created code paths.
*/
function parseCodePaths(code) {
const retv = [];
linter.defineRule("test", () => ({
onCodePathStart(codePath) {
retv.push(codePath);
}
}));
linter.verify(code, {
rules: { test: 2 },
parserOptions: { ecmaVersion: "latest" }
});
return retv;
}
/**
* Traverses a given code path then returns the order of traversing.
* @param {CodePath} codePath A code path to traverse.
* @param {Object|undefined} [options] The option object of
* `codePath.traverseSegments()` method.
* @param {Function|undefined} [callback] The callback function of
* `codePath.traverseSegments()` method.
* @returns {string[]} The list of segment's ids in the order traversed.
*/
function getOrderOfTraversing(codePath, options, callback) {
const retv = [];
codePath.traverseSegments(options, (segment, controller) => {
retv.push(segment.id);
if (callback) {
callback(segment, controller); // eslint-disable-line node/callback-return -- At end of inner function
}
});
return retv;
}
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
describe("CodePathAnalyzer", () => {
/*
* If you need to output the code paths and DOT graph information for a
* particular piece of code, update and uncomment the following test and
* then run:
* DEBUG=eslint:code-path npx mocha tests/lib/linter/code-path-analysis/
*
* All the information you need will be output to the console.
*/
/*
* it.only("test", () => {
* const codePaths = parseCodePaths("class Foo { a = () => b }");
* });
*/
describe("CodePath#origin", () => {
it("should be 'program' when code path starts at root node", () => {
const codePath = parseCodePaths("foo(); bar(); baz();")[0];
assert.strictEqual(codePath.origin, "program");
});
it("should be 'function' when code path starts inside a function", () => {
const codePath = parseCodePaths("function foo() {}")[1];
assert.strictEqual(codePath.origin, "function");
});
it("should be 'function' when code path starts inside an arrow function", () => {
const codePath = parseCodePaths("let foo = () => {}")[1];
assert.strictEqual(codePath.origin, "function");
});
it("should be 'class-field-initializer' when code path starts inside a class field initializer", () => {
const codePath = parseCodePaths("class Foo { a=1; }")[1];
assert.strictEqual(codePath.origin, "class-field-initializer");
});
it("should be 'class-static-block' when code path starts inside a class static block", () => {
const codePath = parseCodePaths("class Foo { static { this.a=1; } }")[1];
assert.strictEqual(codePath.origin, "class-static-block");
});
});
describe(".traverseSegments()", () => {
describe("should traverse segments from the first to the end:", () => {
/* eslint-disable internal-rules/multiline-comment-style -- Commenting out */
it("simple", () => {
const codePath = parseCodePaths("foo(); bar(); baz();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nExpressionStatement\nCallExpression\nIdentifier (foo)\nExpressionStatement\nCallExpression\nIdentifier (bar)\nExpressionStatement\nCallExpression\nIdentifier (baz)"];
initial->s1_1->final;
}
*/
});
it("if", () => {
const codePath = parseCodePaths("if (a) foo(); else bar(); baz();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_3", "s1_4"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nIfStatement\nIdentifier (a)"];
s1_2[label="ExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (baz)"];
s1_3[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
initial->s1_1->s1_2->s1_4;
s1_1->s1_3->s1_4->final;
}
*/
});
it("switch", () => {
const codePath = parseCodePaths("switch (a) { case 0: foo(); break; case 1: bar(); } baz();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_4", "s1_5", "s1_6"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nSwitchStatement\nIdentifier (a)\nSwitchCase\nLiteral (0)"];
s1_2[label="ExpressionStatement\nCallExpression\nIdentifier (foo)\nBreakStatement"];
s1_3[style="rounded,dashed,filled",fillcolor="#FF9800",label="<<unreachable>>\nSwitchCase:exit"];
s1_5[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
s1_6[label="ExpressionStatement\nCallExpression\nIdentifier (baz)"];
s1_4[label="SwitchCase\nLiteral (1)"];
initial->s1_1->s1_2->s1_3->s1_5->s1_6;
s1_1->s1_4->s1_5;
s1_2->s1_6;
s1_4->s1_6->final;
}
*/
});
it("while", () => {
const codePath = parseCodePaths("while (a) foo(); bar();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_3", "s1_4"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nWhileStatement"];
s1_2[label="Identifier (a)"];
s1_3[label="ExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
initial->s1_1->s1_2->s1_3->s1_2->s1_4->final;
}
*/
});
it("for", () => {
const codePath = parseCodePaths("for (var i = 0; i < 10; ++i) foo(i); bar();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_3", "s1_4", "s1_5"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nForStatement\nVariableDeclaration\nVariableDeclarator\nIdentifier (i)\nLiteral (0)"];
s1_2[label="BinaryExpression\nIdentifier (i)\nLiteral (10)"];
s1_3[label="ExpressionStatement\nCallExpression\nIdentifier (foo)\nIdentifier (i)"];
s1_4[label="UpdateExpression\nIdentifier (i)"];
s1_5[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
initial->s1_1->s1_2->s1_3->s1_4->s1_2->s1_5->final;
}
*/
});
it("for-in", () => {
const codePath = parseCodePaths("for (var key in obj) foo(key); bar();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_3", "s1_2", "s1_4", "s1_5"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nForInStatement"];
s1_3[label="Identifier (obj)"];
s1_2[label="VariableDeclaration\nVariableDeclarator\nIdentifier (key)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (foo)\nIdentifier (key)"];
s1_5[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
initial->s1_1->s1_3->s1_2->s1_4->s1_2;
s1_3->s1_5;
s1_4->s1_5->final;
}
*/
});
it("try-catch", () => {
const codePath = parseCodePaths("try { foo(); } catch (e) { bar(); } baz();")[0];
const order = getOrderOfTraversing(codePath);
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_3", "s1_4"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nTryStatement\nBlockStatement\nExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_2[label="CallExpression:exit\nExpressionStatement:exit\nBlockStatement:exit"];
s1_3[label="CatchClause\nIdentifier (e)\nBlockStatement\nExpressionStatement\nCallExpression\nIdentifier (bar)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (baz)"];
initial->s1_1->s1_2->s1_3->s1_4;
s1_1->s1_3;
s1_2->s1_4->final;
}
*/
});
});
it("should traverse segments from `options.first` to `options.last`.", () => {
const codePath = parseCodePaths("if (a) { if (b) { foo(); } bar(); } else { out1(); } out2();")[0];
const order = getOrderOfTraversing(codePath, {
first: codePath.initialSegment.nextSegments[0],
last: codePath.initialSegment.nextSegments[0].nextSegments[1]
});
assert.deepStrictEqual(order, ["s1_2", "s1_3", "s1_4"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nIfStatement\nIdentifier (a)"];
s1_2[label="BlockStatement\nIfStatement\nIdentifier (b)"];
s1_3[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
s1_6[label="ExpressionStatement\nCallExpression\nIdentifier (out2)"];
s1_5[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (out1)"];
initial->s1_1->s1_2->s1_3->s1_4->s1_6;
s1_1->s1_5->s1_6;
s1_2->s1_4;
s1_6->final;
}
*/
});
it("should stop immediately when 'controller.break()' was called.", () => {
const codePath = parseCodePaths("if (a) { if (b) { foo(); } bar(); } else { out1(); } out2();")[0];
const order = getOrderOfTraversing(codePath, null, (segment, controller) => {
if (segment.id === "s1_2") {
controller.break();
}
});
assert.deepStrictEqual(order, ["s1_1", "s1_2"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nIfStatement\nIdentifier (a)"];
s1_2[label="BlockStatement\nIfStatement\nIdentifier (b)"];
s1_3[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
s1_6[label="ExpressionStatement\nCallExpression\nIdentifier (out2)"];
s1_5[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (out1)"];
initial->s1_1->s1_2->s1_3->s1_4->s1_6;
s1_1->s1_5->s1_6;
s1_2->s1_4;
s1_6->final;
}
*/
});
it("should skip the current branch when 'controller.skip()' was called.", () => {
const codePath = parseCodePaths("if (a) { if (b) { foo(); } bar(); } else { out1(); } out2();")[0];
const order = getOrderOfTraversing(codePath, null, (segment, controller) => {
if (segment.id === "s1_2") {
controller.skip();
}
});
assert.deepStrictEqual(order, ["s1_1", "s1_2", "s1_5", "s1_6"]);
/*
digraph {
node[shape=box,style="rounded,filled",fillcolor=white];
initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
s1_1[label="Program\nIfStatement\nIdentifier (a)"];
s1_2[label="BlockStatement\nIfStatement\nIdentifier (b)"];
s1_3[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (foo)"];
s1_4[label="ExpressionStatement\nCallExpression\nIdentifier (bar)"];
s1_6[label="ExpressionStatement\nCallExpression\nIdentifier (out2)"];
s1_5[label="BlockStatement\nExpressionStatement\nCallExpression\nIdentifier (out1)"];
initial->s1_1->s1_2->s1_3->s1_4->s1_6;
s1_1->s1_5->s1_6;
s1_2->s1_4;
s1_6->final;
}
*/
});
/* eslint-enable internal-rules/multiline-comment-style -- Commenting out */
});
});