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601 lines
21 KiB
JavaScript
601 lines
21 KiB
JavaScript
describe("PEG.js grammar parser", function() {
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var trivialGrammar,
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literalAbcd = { type: "literal", value: "abcd", ignoreCase: false },
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literalEfgh = { type: "literal", value: "efgh", ignoreCase: false },
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literalIjkl = { type: "literal", value: "ijkl", ignoreCase: false },
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optionalLiteral = { type: "optional", expression: literalAbcd },
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simpleNotLiteral = { type: "simple_not", expression: literalAbcd },
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labeledAbcd = { type: "labeled", label: "a", expression: literalAbcd },
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labeledEfgh = { type: "labeled", label: "b", expression: literalEfgh },
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labeledIjkl = { type: "labeled", label: "c", expression: literalIjkl },
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sequenceOfLiterals = {
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type: "sequence",
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elements: [literalAbcd, literalEfgh, literalIjkl]
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},
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sequenceOfLabeleds = {
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type: "sequence",
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elements: [labeledAbcd, labeledEfgh, labeledIjkl]
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},
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choiceOfLiterals = {
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type: "choice",
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alternatives: [literalAbcd, literalEfgh, literalIjkl]
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};
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function oneRuleGrammar(expression) {
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var initializer = arguments.length > 1 ? arguments[1] : null;
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return {
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type: "grammar",
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initializer: initializer,
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rules: [
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{
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type: "rule",
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name: "start",
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expression: expression
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}
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]
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};
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}
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function actionGrammar(code) {
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return oneRuleGrammar({
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type: "action",
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expression: literalAbcd,
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code: code
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});
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}
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function ruleRefGrammar(name) {
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return oneRuleGrammar({ type: "rule_ref", name: name });
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}
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function literalGrammar(value) {
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var ignoreCase = arguments.length > 1 ? arguments[1] : false;
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return oneRuleGrammar({
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type: "literal",
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value: value,
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ignoreCase: ignoreCase
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});
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}
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function classGrammar(parts, rawText) {
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var inverted = arguments.length > 2 ? arguments[2] : false,
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ignoreCase = arguments.length > 3 ? arguments[3] : false;
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return oneRuleGrammar({
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type: "class",
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parts: parts,
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rawText: rawText,
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inverted: inverted,
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ignoreCase: ignoreCase
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});
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}
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beforeEach(function() {
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trivialGrammar = literalGrammar("abcd");
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this.addMatchers({
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toParseAs: function(expected) {
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var result;
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try {
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result = PEG.parser.parse(this.actual);
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this.message = function() {
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return "Expected " + jasmine.pp(this.actual) + " "
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+ (this.isNot ? "not " : "")
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+ "to parse as " + jasmine.pp(expected) + ", "
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+ "but it parsed as " + jasmine.pp(result) + ".";
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};
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return this.env.equals_(result, expected);
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} catch (e) {
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this.message = function() {
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return "Expected " + jasmine.pp(this.actual) + " "
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+ "to parse as " + jasmine.pp(expected) + ", "
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+ "but it failed to parse with message "
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+ jasmine.pp(e.message) + ".";
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};
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return false;
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}
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},
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toFailToParse: function(details) {
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/*
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* Extracted into a function just to silence JSHint complaining about
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* creating functions in a loop.
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*/
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function buildKeyMessage(key, value) {
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return function() {
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return "Expected " + jasmine.pp(this.actual) + " to fail to parse"
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+ (details ? " with details " + jasmine.pp(details) : "") + ", "
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+ "but " + jasmine.pp(key) + " "
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+ "is " + jasmine.pp(value) + ".";
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};
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}
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var result;
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try {
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result = PEG.parser.parse(this.actual);
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this.message = function() {
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return "Expected " + jasmine.pp(this.actual) + " to fail to parse"
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+ (details ? " with details " + jasmine.pp(details) : "") + ", "
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+ "but it parsed as " + jasmine.pp(result) + ".";
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};
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return false;
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} catch (e) {
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/*
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* Should be at the top level but then JSHint complains about bad for
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* in variable.
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*/
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var key;
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if (this.isNot) {
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this.message = function() {
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return "Expected " + jasmine.pp(this.actual) + " to parse, "
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+ "but it failed with message "
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+ jasmine.pp(e.message) + ".";
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};
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} else {
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if (details) {
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for (key in details) {
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if (details.hasOwnProperty(key)) {
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if (!this.env.equals_(e[key], details[key])) {
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this.message = buildKeyMessage(key, e[key]);
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return false;
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}
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}
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}
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}
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}
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return true;
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}
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}
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});
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});
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/* Canonical grammar is "a = \"abcd\"; b = \"efgh\"; c = \"ijkl\";". */
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it("parses grammar", function() {
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var ruleA = { type: "rule", name: "a", expression: literalAbcd },
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ruleB = { type: "rule", name: "b", expression: literalEfgh },
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ruleC = { type: "rule", name: "c", expression: literalIjkl };
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expect('a = "abcd"').toParseAs({
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type: "grammar",
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initializer: null,
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rules: [ruleA]
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});
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expect('{ code } a = "abcd"').toParseAs({
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type: "grammar",
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initializer: { type: "initializer", code: " code " },
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rules: [ruleA]
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});
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expect('a = "abcd"; b = "efgh"; c = "ijkl"').toParseAs({
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type: "grammar",
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initializer: null,
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rules: [ruleA, ruleB, ruleC]
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});
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});
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/* Canonical initializer is "{ code }". */
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it("parses initializer", function() {
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var grammar = oneRuleGrammar(literalAbcd, {
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type: "initializer",
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code: " code "
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});
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expect('{ code } start = "abcd"' ).toParseAs(grammar);
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expect('{ code }; start = "abcd"').toParseAs(grammar);
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});
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/* Canonical rule is "a: \"abcd\"". */
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it("parses rule", function() {
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expect('start = "abcd" / "efgh" / "ijkl"').toParseAs(
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oneRuleGrammar(choiceOfLiterals)
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);
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expect('start "start rule" = "abcd" / "efgh" / "ijkl"').toParseAs(
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oneRuleGrammar({
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type: "named",
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name: "start rule",
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expression: choiceOfLiterals
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})
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);
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expect('start = "abcd" / "efgh" / "ijkl";').toParseAs(
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oneRuleGrammar(choiceOfLiterals)
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);
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});
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/* Canonical expression is "\"abcd\" / \"efgh\" / \"ijkl\"". */
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it("parses expression", function() {
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expect('start = "abcd" / "efgh" / "ijkl"').toParseAs(
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oneRuleGrammar(choiceOfLiterals)
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);
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});
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/* Canonical choice is "\"abcd\" / \"efgh\" / \"ijkl\"". */
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it("parses choice", function() {
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expect('start = "abcd" "efgh" "ijkl"').toParseAs(
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oneRuleGrammar(sequenceOfLiterals)
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);
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expect(
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'start = "abcd" "efgh" "ijkl" / "abcd" "efgh" "ijkl" / "abcd" "efgh" "ijkl"'
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).toParseAs(oneRuleGrammar({
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type: "choice",
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alternatives: [sequenceOfLiterals, sequenceOfLiterals, sequenceOfLiterals]
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}));
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});
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/* Canonical sequence is "\"abcd\" \"efgh\" \"ijkl\"". */
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it("parses sequence", function() {
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expect('start = a:"abcd" { code }').toParseAs(
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oneRuleGrammar({ type: "action", expression: labeledAbcd, code: " code " })
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);
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expect('start = a:"abcd" b:"efgh" c:"ijkl" { code }').toParseAs(
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oneRuleGrammar({
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type: "action",
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expression: sequenceOfLabeleds,
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code: " code "
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})
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);
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expect('start = a:"abcd"').toParseAs(
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oneRuleGrammar(labeledAbcd)
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);
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expect('start = a:"abcd" b:"efgh" c:"ijkl"').toParseAs(
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oneRuleGrammar(sequenceOfLabeleds)
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);
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});
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/* Canonical labeled is "label:\"abcd\"". */
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it("parses labeled", function() {
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expect('start = label:!"abcd"').toParseAs(oneRuleGrammar({
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type: "labeled",
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label: "label",
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expression: simpleNotLiteral
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}));
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expect('start = !"abcd"' ).toParseAs(oneRuleGrammar(simpleNotLiteral));
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});
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/* Canonical prefixed is "!\"abcd\"". */
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it("parses prefixed", function() {
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expect('start = $"abcd"?' ).toParseAs(oneRuleGrammar({
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type: "text",
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expression: optionalLiteral
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}));
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expect('start = &{ code }').toParseAs(oneRuleGrammar({
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type: "semantic_and",
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code: " code "
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}));
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expect('start = &"abcd"?' ).toParseAs(oneRuleGrammar({
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type: "simple_and",
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expression: optionalLiteral
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}));
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expect('start = !{ code }').toParseAs(oneRuleGrammar({
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type: "semantic_not",
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code: " code "
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}));
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expect('start = !"abcd"?' ).toParseAs(oneRuleGrammar({
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type: "simple_not",
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expression: optionalLiteral
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}));
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expect('start = "abcd"?' ).toParseAs(oneRuleGrammar(optionalLiteral));
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});
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/* Canonical suffixed is "\"abcd\"?". */
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it("parses suffixed", function() {
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expect('start = "abcd"?').toParseAs(oneRuleGrammar(optionalLiteral));
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expect('start = "abcd"*').toParseAs(oneRuleGrammar({
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type: "zero_or_more",
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expression: literalAbcd
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}));
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expect('start = "abcd"+').toParseAs(oneRuleGrammar({
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type: "one_or_more",
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expression: literalAbcd
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}));
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expect('start = "abcd"' ).toParseAs(literalGrammar("abcd"));
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});
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/* Canonical primary is "\"abcd\"". */
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it("parses primary", function() {
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expect('start = a' ).toParseAs(ruleRefGrammar("a"));
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expect('start = "abcd"' ).toParseAs(literalGrammar("abcd"));
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expect('start = [a-d]' ).toParseAs(classGrammar([["a", "d"]], "[a-d]"));
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expect('start = .' ).toParseAs(oneRuleGrammar({ type: "any" }));
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expect('start = ("abcd")').toParseAs(literalGrammar("abcd"));
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});
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/* Canonical action is "{ code }". */
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it("parses action", function() {
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expect('start = "abcd" { code }').toParseAs(actionGrammar(" code "));
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expect('start = "abcd" { code }\n').toParseAs(actionGrammar(" code "));
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});
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/* Canonical braced is "{ code }". */
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it("parses braced", function() {
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expect('start = "abcd" {}' ).toParseAs(actionGrammar(""));
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expect('start = "abcd" {{a}}' ).toParseAs(actionGrammar("{a}"));
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expect('start = "abcd" {abcd}' ).toParseAs(actionGrammar("abcd"));
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expect('start = "abcd" {{a}{b}{c}}').toParseAs(actionGrammar("{a}{b}{c}"));
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});
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/* Canonical nonBraceCharacters is "abcd". */
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it("parses nonBraceCharacters", function() {
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expect('start = "abcd" {a}' ).toParseAs(actionGrammar("a"));
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expect('start = "abcd" {abc}').toParseAs(actionGrammar("abc"));
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});
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/* Canonical nonBraceCharacter is "a". */
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it("parses nonBraceCharacter", function() {
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expect('start = "abcd" {a}').toParseAs(actionGrammar("a"));
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expect('start = "abcd" {{}').toFailToParse();
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expect('start = "abcd" {}}').toFailToParse();
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});
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/* Trivial character rules are not tested. */
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/* Canonical identifier is "a". */
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it("parses identifier", function() {
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expect('start = a' ).toParseAs(ruleRefGrammar("a"));
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expect('start = _' ).toParseAs(ruleRefGrammar("_"));
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expect('start = aa' ).toParseAs(ruleRefGrammar("aa"));
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expect('start = a0' ).toParseAs(ruleRefGrammar("a0"));
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expect('start = a_' ).toParseAs(ruleRefGrammar("a_"));
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expect('start = abcd').toParseAs(ruleRefGrammar("abcd"));
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expect('start = a\n').toParseAs(ruleRefGrammar("a"));
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});
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/* Canonical literal is "\"abcd\"". */
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it("parses literal", function() {
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expect('start = "abcd"' ).toParseAs(literalGrammar("abcd"));
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expect("start = 'abcd'" ).toParseAs(literalGrammar("abcd"));
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expect('start = "abcd"i').toParseAs(literalGrammar("abcd", true));
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expect('start = "abcd"\n').toParseAs(literalGrammar("abcd"));
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});
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/* Canonical string is "\"abcd\"". */
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it("parses string", function() {
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var grammar = oneRuleGrammar({
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type: "named",
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name: "abcd",
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expression: literalAbcd
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});
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expect('start "abcd" = "abcd"' ).toParseAs(grammar);
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expect('start \'abcd\' = "abcd"').toParseAs(grammar);
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expect('start "abcd"\n= "abcd"').toParseAs(grammar);
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});
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/* Canonical doubleQuotedString is "\"abcd\"". */
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it("parses doubleQuotedString", function() {
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expect('start = ""' ).toParseAs(literalGrammar(""));
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expect('start = "a"' ).toParseAs(literalGrammar("a"));
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expect('start = "abc"').toParseAs(literalGrammar("abc"));
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});
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/* Canonical doubleQuotedCharacter is "a". */
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it("parses doubleQuotedCharacter", function() {
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expect('start = "a"' ).toParseAs(literalGrammar("a"));
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expect('start = "\\n"' ).toParseAs(literalGrammar("\n"));
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expect('start = "\\0"' ).toParseAs(literalGrammar("\x00"));
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expect('start = "\\xFF"' ).toParseAs(literalGrammar("\xFF"));
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expect('start = "\\uFFFF"').toParseAs(literalGrammar("\uFFFF"));
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expect('start = "\\\n"' ).toParseAs(literalGrammar(""));
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});
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/* Canonical simpleDoubleQuotedCharacter is "a". */
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it("parses simpleDoubleQuotedCharacter", function() {
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expect('start = "a"').toParseAs(literalGrammar("a"));
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expect('start = """' ).toFailToParse();
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expect('start = "\\"').toFailToParse();
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expect('start = "\n"').toFailToParse();
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});
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/* Canonical singleQuotedString is "'abcd'". */
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it("parses singleQuotedString", function() {
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expect("start = ''" ).toParseAs(literalGrammar(""));
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expect("start = 'a'" ).toParseAs(literalGrammar("a"));
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expect("start = 'abc'").toParseAs(literalGrammar("abc"));
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});
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/* Canonical singleQuotedCharacter is "a". */
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it("parses singleQuotedCharacter", function() {
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expect("start = 'a'" ).toParseAs(literalGrammar("a"));
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expect("start = '\\n'" ).toParseAs(literalGrammar("\n"));
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expect("start = '\\0'" ).toParseAs(literalGrammar("\x00"));
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expect("start = '\\xFF'" ).toParseAs(literalGrammar("\xFF"));
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expect("start = '\\uFFFF'").toParseAs(literalGrammar("\uFFFF"));
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expect("start = '\\\n'" ).toParseAs(literalGrammar(""));
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});
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/* Canonical simpleSingleQuotedCharacter is "a". */
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it("parses simpleSingleQuotedCharacter", function() {
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expect("start = 'a'").toParseAs(literalGrammar("a"));
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expect("start = '''" ).toFailToParse();
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expect("start = '\\'").toFailToParse();
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expect("start = '\n'").toFailToParse();
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});
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/* Canonical class is "[a-d]". */
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it("parses class", function() {
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expect('start = []' ).toParseAs(classGrammar([], "[]"));
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expect('start = [a-d]' ).toParseAs(classGrammar([["a", "d"]], "[a-d]"));
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expect('start = [a]' ).toParseAs(classGrammar(["a"], "[a]"));
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expect('start = [a-de-hi-l]').toParseAs(
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classGrammar([["a", "d"], ["e", "h"], ["i", "l"]], "[a-de-hi-l]")
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);
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expect('start = [^a-d]').toParseAs(
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classGrammar([["a", "d"]], "[^a-d]", true, false)
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);
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expect('start = [a-d]i').toParseAs(
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classGrammar([["a", "d"]], "[a-d]i", false, true)
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);
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expect('start = [a-d]\n').toParseAs(classGrammar([["a", "d"]], "[a-d]"));
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});
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/* Canonical classCharacterRange is "a-d". */
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it("parses classCharacterRange", function() {
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expect('start = [a-d]').toParseAs(classGrammar([["a", "d"]], "[a-d]"));
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expect('start = [a-a]').toParseAs(classGrammar([["a", "a"]], "[a-a]"));
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expect('start = [b-a]').toFailToParse({
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message: "Invalid character range: b-a."
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});
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});
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/* Canonical classCharacter is "a". */
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it("parses classCharacter", function() {
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expect('start = [a]').toParseAs(classGrammar(["a"], "[a]"));
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});
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/* Canonical bracketDelimitedCharacter is "a". */
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it("parses bracketDelimitedCharacter", function() {
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expect('start = [a]' ).toParseAs(classGrammar(["a"], "[a]"));
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expect('start = [\\n]' ).toParseAs(classGrammar(["\n"], "[\\n]"));
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expect('start = [\\0]' ).toParseAs(classGrammar(["\x00"], "[\\0]"));
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expect('start = [\\xFF]' ).toParseAs(classGrammar(["\xFF"], "[\\xFF]"));
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expect('start = [\\uFFFF]').toParseAs(classGrammar(["\uFFFF"], "[\\uFFFF]"));
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expect('start = [\\\n]' ).toParseAs(classGrammar([""], "[\\\n]"));
|
|
});
|
|
|
|
/* Canonical simpleBracketDelimiedCharacter is "a". */
|
|
it("parses simpleBracketDelimitedCharacter", function() {
|
|
expect('start = [a]').toParseAs(classGrammar(["a"], "[a]"));
|
|
|
|
expect('start = []]' ).toFailToParse();
|
|
expect('start = [\\]').toFailToParse();
|
|
expect('start = [\n]').toFailToParse();
|
|
});
|
|
|
|
/* Canonical simpleEscapeSequence is "\\n". */
|
|
it("parses simpleEscapeSequence", function() {
|
|
expect('start = "\\b"').toParseAs(literalGrammar("\b"));
|
|
expect('start = "\\f"').toParseAs(literalGrammar("\f"));
|
|
expect('start = "\\n"').toParseAs(literalGrammar("\n"));
|
|
expect('start = "\\r"').toParseAs(literalGrammar("\r"));
|
|
expect('start = "\\t"').toParseAs(literalGrammar("\t"));
|
|
expect('start = "\\v"').toParseAs(literalGrammar("\x0B")); // no "\v" in IE
|
|
expect('start = "\\a"').toParseAs(literalGrammar("a"));
|
|
|
|
expect('start = "\\1"').toFailToParse();
|
|
expect('start = "\\x"').toFailToParse();
|
|
expect('start = "\\u"').toFailToParse();
|
|
});
|
|
|
|
/* Canonical zeroEscapeSequence is "\\0". */
|
|
it("parses zeroEscapeSequence", function() {
|
|
expect('start = "\\0"').toParseAs(literalGrammar("\x00"));
|
|
|
|
expect('start = "\\00"').toFailToParse();
|
|
expect('start = "\\09"').toFailToParse();
|
|
});
|
|
|
|
/* Canonical hexEscapeSequence is "\\xFF". */
|
|
it("parses hexEscapeSequence", function() {
|
|
expect('start = "\\xFF"').toParseAs(literalGrammar("\xFF"));
|
|
});
|
|
|
|
/* Canonical unicodeEscapeSequence is "\\uFFFF". */
|
|
it("parses unicodeEscapeSequence", function() {
|
|
expect('start = "\\uFFFF"').toParseAs(literalGrammar("\uFFFF"));
|
|
});
|
|
|
|
/* Canonical eolEscapeSequence is "\\\n". */
|
|
it("parses eolEscapeSequence", function() {
|
|
expect('start = "\\\n"' ).toParseAs(literalGrammar(""));
|
|
});
|
|
|
|
/* Trivial character class rules are not tested. */
|
|
|
|
/* Canonical __ is "\n". */
|
|
it("parses __", function() {
|
|
expect('start ="abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start = "abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =/* comment */"abcd"').toParseAs(trivialGrammar);
|
|
expect('start = "abcd"' ).toParseAs(trivialGrammar);
|
|
});
|
|
|
|
// Canonical comment is "/* comment */".
|
|
it("parses comment", function() {
|
|
expect('start =// comment\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =/* comment */"abcd"').toParseAs(trivialGrammar);
|
|
});
|
|
|
|
/* Canonical singleLineComment is "// comment". */
|
|
it("parses singleLineComment", function() {
|
|
expect('start =//\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =//a\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =//aaa\n"abcd"').toParseAs(trivialGrammar);
|
|
});
|
|
|
|
// Canonical multiLineComment is "/* comment */".
|
|
it("parses multiLineComment", function() {
|
|
expect('start =/**/"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =/*a*/"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =/*aaa*/"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =/***/"abcd"' ).toParseAs(trivialGrammar);
|
|
|
|
expect('start =/**/*/"abcd"').toFailToParse();
|
|
});
|
|
|
|
/* Canonical eol is "\n". */
|
|
it("parses eol", function() {
|
|
expect('start =\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\r\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\r"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\u2028"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2029"abcd"').toParseAs(trivialGrammar);
|
|
});
|
|
|
|
/* Canonical eolChar is "\n". */
|
|
it("parses eolChar", function() {
|
|
expect('start =\n"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\r"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\u2028"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2029"abcd"').toParseAs(trivialGrammar);
|
|
});
|
|
|
|
/* Canonical whitespace is " ". */
|
|
it("parses whitespace", function() {
|
|
expect('start =\t"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\x0B"abcd"' ).toParseAs(trivialGrammar); // no "\v" in IE
|
|
expect('start =\f"abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start = "abcd"' ).toParseAs(trivialGrammar);
|
|
expect('start =\u00A0"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\uFEFF"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u1680"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u180E"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2000"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2001"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2002"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2003"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2004"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2005"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2006"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2007"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2008"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u2009"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u200A"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u202F"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u205F"abcd"').toParseAs(trivialGrammar);
|
|
expect('start =\u3000"abcd"').toParseAs(trivialGrammar);
|
|
});
|
|
});
|