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954 lines
31 KiB
JavaScript
954 lines
31 KiB
JavaScript
describe("generated parser", function() {
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function vary(names, block) {
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var values = {
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trackLineAndColumn: [false, true],
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cache: [false, true]
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};
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function varyStep(names, options) {
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var clonedOptions = {}, key, name, i;
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if (names.length === 0) {
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/*
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* We have to clone the options so that the block can save them safely
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* (e.g. by capturing in a closure) without the risk that they will be
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* changed later.
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*/
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for (key in options) {
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clonedOptions[key] = options[key];
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}
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describe(
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"with options " + jasmine.pp(clonedOptions),
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function() { block(clonedOptions); }
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);
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} else {
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name = names[0];
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for (i = 0; i < values[name].length; i++) {
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options[name] = values[name][i];
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varyStep(names.slice(1), options);
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}
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}
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}
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varyStep(names, {});
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}
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function varyAll(block) {
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vary(["cache", "trackLineAndColumn"], block);
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}
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beforeEach(function() {
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this.addMatchers({
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toParse: function(input, expected) {
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var result;
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try {
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result = this.actual.parse(input);
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this.message = function() {
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return "Expected " + jasmine.pp(input) + " "
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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(input) + " "
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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(input, 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(input) + " 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, key;
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try {
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result = this.actual.parse(input);
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this.message = function() {
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return "Expected " + jasmine.pp(input) + " 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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if (this.isNot) {
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this.message = function() {
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return "Expected " + jasmine.pp(input) + " 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 (!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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return true;
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}
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}
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});
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});
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describe("parse", function() {
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var parser = PEG.buildParser([
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'a = "x" { return "a"; }',
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'b = "x" { return "b"; }'
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].join("\n"));
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it("uses the fist rule as a start rule when no |startRule| is specified", function() {
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expect(parser.parse("x")).toBe("a");
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});
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it("uses the specified rule as a start rule when |startRule| is specified", function() {
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expect(parser.parse("x", "a")).toBe("a");
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expect(parser.parse("x", "b")).toBe("b");
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});
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it("throws exception when the specified start rule does not exist", function() {
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expect(function() {
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parser.parse("x", "c");
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}).toThrow("Invalid rule name: \"c\".");
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});
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});
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varyAll(function(options) {
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describe("initializer code", function() {
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it("runs before the parsing begins", function() {
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var parser = PEG.buildParser([
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'{ var result = 42; }',
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'start = "a" { return result }'
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].join("\n"), options);
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expect(parser).toParse("a", 42);
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});
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});
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describe("rule matching", function() {
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var grammar = [
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'{ var n = 0; }',
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'start = (a "b") / (a "c") { return n; }',
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'a = "a" { n++; }'
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].join("\n");
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if (options.cache) {
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it("caches rule match results", function() {
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var parser = PEG.buildParser(grammar, options);
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expect(parser).toParse("ac", 1);
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});
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} else {
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it("does not cache rule match results", function() {
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var parser = PEG.buildParser(grammar, options);
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expect(parser).toParse("ac", 2);
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});
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}
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it("does not overwrite expected string on failure when not named", function() {
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var parser = PEG.buildParser('start = [0-9]', options);
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expect(parser).toFailToParse("a", { expected: ["[0-9]"] });
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});
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it("overwrites expected string on failure when named", function() {
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var parser = PEG.buildParser('start "digit" = [0-9]', options);
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expect(parser).toFailToParse("a", { expected: ["digit"] });
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});
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});
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describe("choice matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = "a" / "b" / "c"', options);
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expect(parser).toParse("a", "a");
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expect(parser).toParse("b", "b");
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expect(parser).toParse("c", "c");
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expect(parser).toFailToParse("d");
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});
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});
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describe("sequence matching", function() {
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it("matches empty sequence correctly", function() {
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var parser = PEG.buildParser('start = ', options);
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expect(parser).toParse("", []);
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});
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it("matches non-empty sequence correctly", function() {
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var parser = PEG.buildParser('start = "a" "b" "c"', options);
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expect(parser).toParse("abc", ["a", "b", "c"]);
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});
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it("does not advance position on failure", function() {
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var parser = PEG.buildParser('start = "a" "b" / "a"', options);
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expect(parser).toParse("a", "a");
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});
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});
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describe("labeled matching", function() {
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it("delegates to the expression", function() {
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var parser = PEG.buildParser('start = a:"a"', options);
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expect(parser).toParse("a", "a");
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expect(parser).toFailToParse("b");
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});
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});
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describe("simple and matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = &"a" "a"', options);
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expect(parser).toParse("a", ["", "a"]);
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expect(parser).toFailToParse("b");
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});
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it("does not advance position on success", function() {
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var parser = PEG.buildParser('start = &"a" "a"', options);
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expect(parser).toParse("a", ["", "a"]);
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});
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it("does not influence expected strings on failure", function() {
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var parser = PEG.buildParser('start = &"a"', options);
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expect(parser).toFailToParse("b", { expected: [] });
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});
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});
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describe("simple not matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = !"a" "b"', options);
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expect(parser).toParse("b", ["", "b"]);
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expect(parser).toFailToParse("a");
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});
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it("does not advance position on failure", function() {
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var parser = PEG.buildParser('start = !"a" / "a"', options);
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expect(parser).toParse("a", "a");
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});
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it("does not influence expected strings on failure", function() {
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var parser = PEG.buildParser('start = !"a"', options);
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expect(parser).toFailToParse("a", { expected: [] });
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});
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});
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describe("semantic and code", function() {
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it("causes successful match by returning |true|", function() {
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var parser = PEG.buildParser('start = &{ return true; }', options);
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expect(parser).toParse("", "");
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});
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it("causes match failure by returning |false|", function() {
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var parser = PEG.buildParser('start = &{ return false; }', options);
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expect(parser).toFailToParse("");
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});
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it("can use label variables", function() {
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var parser = PEG.buildParser(
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'start = a:"a" &{ return a === "a"; }',
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options
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);
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expect(parser).toParse("a", ["a", ""]);
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});
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it("can use the |offset| variable to get the current parse position", function() {
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var parser = PEG.buildParser(
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'start = "a" &{ return offset === 1; }',
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options
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);
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expect(parser).toParse("a", ["a", ""]);
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});
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if (options.trackLineAndColumn) {
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it("can use the |line| and |column| variables to get the current line and column", function() {
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var parser = PEG.buildParser([
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'{ var result; }',
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'start = line (nl+ line)* { return result; }',
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'line = thing (" "+ thing)*',
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'thing = digit / mark',
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'digit = [0-9]',
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'mark = &{ result = [line, column]; return true; } "x"',
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'nl = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
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].join("\n"), options);
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expect(parser).toParse("1\n2\n\n3\n\n\n4 5 x", [7, 5]);
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/* Non-Unix newlines */
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expect(parser).toParse("1\rx", [2, 1]); // Old Mac
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expect(parser).toParse("1\r\nx", [2, 1]); // Windows
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expect(parser).toParse("1\n\rx", [3, 1]); // mismatched
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/* Strange newlines */
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expect(parser).toParse("1\u2028x", [2, 1]); // line separator
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expect(parser).toParse("1\u2029x", [2, 1]); // paragraph separator
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});
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}
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it("can use variables defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ var v = 42 }',
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'start = "a" &{ return v === 42; }'
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].join("\n"), options);
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expect(parser).toParse("a", ["a", ""]);
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});
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it("can use functions defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ function f() { return 42; } }',
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'start = "a" &{ return f() === 42; }'
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].join("\n"), options);
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expect(parser).toParse("a", ["a", ""]);
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});
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});
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describe("semantic not code", function() {
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it("causes successful match by returning |false|", function() {
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var parser = PEG.buildParser('start = !{ return false; }', options);
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expect(parser).toParse("", "");
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});
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it("causes match failure by returning |true|", function() {
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var parser = PEG.buildParser('start = !{ return true; }', options);
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expect(parser).toFailToParse();
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});
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it("can use label variables", function() {
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var parser = PEG.buildParser(
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'start = a:"a" !{ return a !== "a"; }',
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options
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);
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expect(parser).toParse("a", ["a", ""]);
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});
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it("can use the |offset| variable to get the current parse position", function() {
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var parser = PEG.buildParser(
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'start = "a" !{ return offset !== 1; }',
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options
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);
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expect(parser).toParse("a", ["a", ""]);
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});
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if (options.trackLineAndColumn) {
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it("can use the |line| and |column| variables to get the current line and column", function() {
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var parser = PEG.buildParser([
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'{ var result; }',
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'start = line (nl+ line)* { return result; }',
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'line = thing (" "+ thing)*',
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'thing = digit / mark',
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'digit = [0-9]',
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'mark = !{ result = [line, column]; return false; } "x"',
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'nl = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
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].join("\n"), options);
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expect(parser).toParse("1\n2\n\n3\n\n\n4 5 x", [7, 5]);
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/* Non-Unix newlines */
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expect(parser).toParse("1\rx", [2, 1]); // Old Mac
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expect(parser).toParse("1\r\nx", [2, 1]); // Windows
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expect(parser).toParse("1\n\rx", [3, 1]); // mismatched
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/* Strange newlines */
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expect(parser).toParse("1\u2028x", [2, 1]); // line separator
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expect(parser).toParse("1\u2029x", [2, 1]); // paragraph separator
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});
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}
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it("can use variables defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ var v = 42 }',
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'start = "a" !{ return v !== 42; }'
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].join("\n"), options);
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expect(parser).toParse("a", ["a", ""]);
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});
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it("can use functions defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ function f() { return 42; } }',
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'start = "a" !{ return f() !== 42; }'
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].join("\n"), options);
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expect(parser).toParse("a", ["a", ""]);
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});
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});
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describe("optional matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = "a"?', options);
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expect(parser).toParse("", "");
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expect(parser).toParse("a", "a");
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});
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});
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describe("zero or more matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = "a"*', options);
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expect(parser).toParse("", []);
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expect(parser).toParse("a", ["a"]);
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expect(parser).toParse("aaa", ["a", "a", "a"]);
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});
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});
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describe("one or more matching", function() {
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it("matches correctly", function() {
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var parser = PEG.buildParser('start = "a"+', options);
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expect(parser).toFailToParse("");
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expect(parser).toParse("a", ["a"]);
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expect(parser).toParse("aaa", ["a", "a", "a"]);
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});
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});
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describe("action code", function() {
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it("tranforms the expression result by returnung a non-|null| value", function() {
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var parser = PEG.buildParser('start = "a" { return 42; }', options);
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expect(parser).toParse("a", 42);
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});
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it("causes match failure by returning |null|", function() {
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var parser = PEG.buildParser('start = "a" { return null; }', options);
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expect(parser).toFailToParse("a");
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});
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it("is not called when the expression does not match", function() {
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var parser = PEG.buildParser(
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'start = "a" { throw "Boom!"; } / "b"',
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options
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);
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expect(parser).toParse("b", "b");
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});
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it("can use label variables", function() {
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var parser = PEG.buildParser('start = a:"a" { return a; }', options);
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expect(parser).toParse("a", "a");
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});
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it("can use the |offset| variable to get the current parse position", function() {
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var parser = PEG.buildParser(
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'start = "a" ("b" { return offset; })',
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options
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);
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expect(parser).toParse("ab", ["a", 1]);
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});
|
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|
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if (options.trackLineAndColumn) {
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it("can use the |line| and |column| variables to get the current line and column", function() {
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var parser = PEG.buildParser([
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'{ var result; }',
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'start = line (nl+ line)* { return result; }',
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'line = thing (" "+ thing)*',
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'thing = digit / mark',
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'digit = [0-9]',
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'mark = "x" { result = [line, column]; }',
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'nl = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
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].join("\n"), options);
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|
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expect(parser).toParse("1\n2\n\n3\n\n\n4 5 x", [7, 5]);
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/* Non-Unix newlines */
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expect(parser).toParse("1\rx", [2, 1]); // Old Mac
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expect(parser).toParse("1\r\nx", [2, 1]); // Windows
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expect(parser).toParse("1\n\rx", [3, 1]); // mismatched
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|
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/* Strange newlines */
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expect(parser).toParse("1\u2028x", [2, 1]); // line separator
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expect(parser).toParse("1\u2029x", [2, 1]); // paragraph separator
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});
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}
|
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|
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it("can use variables defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ var v = 42 }',
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'start = "a" { return v; }'
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].join("\n"), options);
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expect(parser).toParse("a", 42);
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});
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|
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it("can use functions defined in the initializer", function() {
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var parser = PEG.buildParser([
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'{ function f() { return 42; } }',
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'start = "a" { return f(); }'
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].join("\n"), options);
|
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expect(parser).toParse("a", 42);
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});
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|
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it("does not advance position when the expression matches but the action returns |null|", function() {
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var parser = PEG.buildParser(
|
|
'start = "a" { return null; } / "a"',
|
|
options
|
|
);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
});
|
|
});
|
|
|
|
describe("rule reference matching", function() {
|
|
it("follows rule references", function() {
|
|
var parser = PEG.buildParser([
|
|
'start = static / dynamic',
|
|
'static = "C" / "C++" / "Java" / "C#"',
|
|
'dynamic = "Ruby" / "Python" / "JavaScript"'
|
|
].join("\n"), options);
|
|
|
|
expect(parser).toParse("Java", "Java");
|
|
expect(parser).toParse("Python", "Python");
|
|
});
|
|
});
|
|
|
|
describe("literal matching", function() {
|
|
it("matches empty literal correctly", function() {
|
|
var parser = PEG.buildParser('start = ""', options);
|
|
|
|
expect(parser).toParse("", "");
|
|
});
|
|
|
|
it("matches one-character literal correctly", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toFailToParse("b");
|
|
});
|
|
|
|
it("matches multiple-character literal correctly", function() {
|
|
var parser = PEG.buildParser('start = "abcd"', options);
|
|
|
|
expect(parser).toParse("abcd", "abcd");
|
|
expect(parser).toFailToParse("ebcd");
|
|
expect(parser).toFailToParse("afcd");
|
|
expect(parser).toFailToParse("abgd");
|
|
expect(parser).toFailToParse("abch");
|
|
});
|
|
|
|
it("is case sensitive without the \"i\" flag", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toFailToParse("A");
|
|
});
|
|
|
|
it("is case insensitive with the \"i\" flag", function() {
|
|
var parser = PEG.buildParser('start = "a"i', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toParse("A", "A");
|
|
});
|
|
|
|
it("advances position on success", function() {
|
|
var parser = PEG.buildParser('start = "a" .', options);
|
|
|
|
expect(parser).toParse("ab", ["a", "b"]);
|
|
});
|
|
|
|
it("sets expected string correctly on failure", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", { expected: ['"a"'] });
|
|
});
|
|
});
|
|
|
|
describe("any matching", function() {
|
|
it("matches correctly", function() {
|
|
var parser = PEG.buildParser('start = .', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
});
|
|
|
|
it("advances position on success", function() {
|
|
var parser = PEG.buildParser('start = . .', options);
|
|
|
|
expect(parser).toParse("ab", ["a", "b"]);
|
|
});
|
|
|
|
it("sets expected string correctly on failure", function() {
|
|
var parser = PEG.buildParser('start = .', options);
|
|
|
|
expect(parser).toFailToParse("", { expected: ['any character'] });
|
|
});
|
|
});
|
|
|
|
describe("class matching", function() {
|
|
it("matches empty class correctly", function() {
|
|
var parser = PEG.buildParser('start = []', options);
|
|
|
|
expect(parser).toFailToParse("a");
|
|
});
|
|
|
|
it("matches class with a character list correctly", function() {
|
|
var parser = PEG.buildParser('start = [abc]', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toParse("b", "b");
|
|
expect(parser).toParse("c", "c");
|
|
expect(parser).toFailToParse("d");
|
|
});
|
|
|
|
it("matches class with a range correctly", function() {
|
|
var parser = PEG.buildParser('start = [a-c]', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toParse("b", "b");
|
|
expect(parser).toParse("c", "c");
|
|
expect(parser).toFailToParse("d");
|
|
});
|
|
|
|
it("matches inverted class correctly", function() {
|
|
var parser = PEG.buildParser('start = [^a]', options);
|
|
|
|
expect(parser).toFailToParse("a");
|
|
expect(parser).toParse("b", "b");
|
|
});
|
|
|
|
it("is case sensitive without the \"i\" flag", function() {
|
|
var parser = PEG.buildParser('start = [a]', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toFailToParse("A");
|
|
});
|
|
|
|
it("is case insensitive with the \"i\" flag", function() {
|
|
var parser = PEG.buildParser('start = [a]i', options);
|
|
|
|
expect(parser).toParse("a", "a");
|
|
expect(parser).toParse("A", "A");
|
|
});
|
|
|
|
it("advances position on success", function() {
|
|
var parser = PEG.buildParser('start = [a] .', options);
|
|
|
|
expect(parser).toParse("ab", ["a", "b"]);
|
|
});
|
|
|
|
it("sets expected string correctly on failure", function() {
|
|
var parser = PEG.buildParser('start = [a]', options);
|
|
|
|
expect(parser).toFailToParse("b", { expected: ["[a]"] });
|
|
});
|
|
});
|
|
|
|
describe("error reporting", function() {
|
|
describe("behavior", function() {
|
|
it("reports only the rightmost error", function() {
|
|
var parser = PEG.buildParser('start = "a" "b" / "a" "c" "d"', options);
|
|
|
|
expect(parser).toFailToParse("ace", { offset: 2, expected: ['"d"'] });
|
|
});
|
|
});
|
|
|
|
describe("expected strings reporting", function() {
|
|
it("reports expected strings correctly with no alternative", function() {
|
|
var parser = PEG.buildParser('start = ', options);
|
|
|
|
expect(parser).toFailToParse("a", { expected: [] });
|
|
});
|
|
|
|
it("reports expected strings correctly with one alternative", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", { expected: ['"a"'] });
|
|
});
|
|
|
|
it("reports expected strings correctly with multiple alternatives", function() {
|
|
var parser = PEG.buildParser('start = "a" / "b" / "c"', options);
|
|
|
|
expect(parser).toFailToParse("d", {
|
|
expected: ['"a"', '"b"', '"c"']
|
|
});
|
|
});
|
|
|
|
it("removes duplicates from expected strings", function() {
|
|
var parser = PEG.buildParser('start = "a" / "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", { expected: ['"a"'] });
|
|
});
|
|
|
|
it("sorts expected strings", function() {
|
|
var parser = PEG.buildParser('start = "c" / "b" / "a"', options);
|
|
|
|
expect(parser).toFailToParse("d", {
|
|
expected: ['"a"', '"b"', '"c"']
|
|
});
|
|
});
|
|
});
|
|
|
|
describe("found string reporting", function() {
|
|
it("reports found string correctly at the end of input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("", { found: null });
|
|
});
|
|
|
|
it("reports found string correctly in the middle of input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", { found: "b" });
|
|
});
|
|
});
|
|
|
|
describe("message building", function() {
|
|
it("builds message correctly with no alternative", function() {
|
|
var parser = PEG.buildParser('start = ', options);
|
|
|
|
expect(parser).toFailToParse("a", {
|
|
message: 'Expected end of input but "a" found.'
|
|
});
|
|
});
|
|
|
|
it("builds message correctly with one alternative", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", {
|
|
message: 'Expected "a" but "b" found.'
|
|
});
|
|
});
|
|
|
|
it("builds message correctly with multiple alternatives", function() {
|
|
var parser = PEG.buildParser('start = "a" / "b" / "c"', options);
|
|
|
|
expect(parser).toFailToParse("d", {
|
|
message: 'Expected "a", "b" or "c" but "d" found.'
|
|
});
|
|
});
|
|
|
|
it("builds message correctly at the end of input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("", {
|
|
message: 'Expected "a" but end of input found.'
|
|
});
|
|
});
|
|
|
|
it("builds message correctly in the middle of input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", {
|
|
message: 'Expected "a" but "b" found.'
|
|
});
|
|
});
|
|
});
|
|
|
|
describe("position reporting", function() {
|
|
it("reports position correctly with invalid input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("b", { offset: 0, line: 1, column: 1 });
|
|
});
|
|
|
|
it("reports position correctly with trailing input", function() {
|
|
var parser = PEG.buildParser('start = "a"', options);
|
|
|
|
expect(parser).toFailToParse("aa", { offset: 1, line: 1, column: 2});
|
|
});
|
|
|
|
it("reports position correctly in complex cases", function() {
|
|
var parser = PEG.buildParser([
|
|
'start = line (nl+ line)*',
|
|
'line = digit (" "+ digit)*',
|
|
'digit = [0-9]',
|
|
'nl = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
|
|
].join("\n"), options);
|
|
|
|
expect(parser).toFailToParse("1\n2\n\n3\n\n\n4 5 x", {
|
|
offset: 13,
|
|
line: 7,
|
|
column: 5
|
|
});
|
|
|
|
/* Non-Unix newlines */
|
|
expect(parser).toFailToParse("1\rx", { // Old Mac
|
|
offset: 2,
|
|
line: 2,
|
|
column: 1
|
|
});
|
|
expect(parser).toFailToParse("1\r\nx", { // Windows
|
|
offset: 3,
|
|
line: 2,
|
|
column: 1
|
|
});
|
|
expect(parser).toFailToParse("1\n\rx", { // mismatched
|
|
offset: 3,
|
|
line: 3,
|
|
column: 1
|
|
});
|
|
|
|
/* Strange newlines */
|
|
expect(parser).toFailToParse("1\u2028x", { // line separator
|
|
offset: 2,
|
|
line: 2,
|
|
column: 1
|
|
});
|
|
expect(parser).toFailToParse("1\u2029x", { // paragraph separator
|
|
offset: 2,
|
|
line: 2,
|
|
column: 1
|
|
});
|
|
});
|
|
});
|
|
});
|
|
|
|
/*
|
|
* Following examples are from Wikipedia, see
|
|
* http://en.wikipedia.org/w/index.php?title=Parsing_expression_grammar&oldid=335106938.
|
|
*/
|
|
describe("complex examples", function() {
|
|
it("handles arithmetics example correctly", function() {
|
|
/*
|
|
* Value ← [0-9]+ / '(' Expr ')'
|
|
* Product ← Value (('*' / '/') Value)*
|
|
* Sum ← Product (('+' / '-') Product)*
|
|
* Expr ← Sum
|
|
*/
|
|
var parser = PEG.buildParser([
|
|
'Expr = Sum',
|
|
'Sum = head:Product tail:(("+" / "-") Product)* {',
|
|
' var result = head, i;',
|
|
' for (i = 0; i < tail.length; i++) {',
|
|
' if (tail[i][0] == "+") { result += tail[i][1]; }',
|
|
' if (tail[i][0] == "-") { result -= tail[i][1]; }',
|
|
' }',
|
|
' return result;',
|
|
' }',
|
|
'Product = head:Value tail:(("*" / "/") Value)* {',
|
|
' var result = head, i;',
|
|
' for (i = 0; i < tail.length; i++) {',
|
|
' if (tail[i][0] == "*") { result *= tail[i][1]; }',
|
|
' if (tail[i][0] == "/") { result /= tail[i][1]; }',
|
|
' }',
|
|
' return result;',
|
|
' }',
|
|
'Value = digits:[0-9]+ { return parseInt(digits.join(""), 10); }',
|
|
' / "(" expr:Expr ")" { return expr; }'
|
|
].join("\n"), options);
|
|
|
|
/* The "value" rule */
|
|
expect(parser).toParse("0", 0);
|
|
expect(parser).toParse("123", 123);
|
|
expect(parser).toParse("(42+43)", 42+43);
|
|
|
|
/* The "product" rule */
|
|
expect(parser).toParse("42", 42);
|
|
expect(parser).toParse("42*43", 42*43);
|
|
expect(parser).toParse("42*43*44*45", 42*43*44*45);
|
|
expect(parser).toParse("42/43", 42/43);
|
|
expect(parser).toParse("42/43/44/45", 42/43/44/45);
|
|
|
|
/* The "sum" rule */
|
|
expect(parser).toParse("42*43", 42*43);
|
|
expect(parser).toParse("42*43+44*45", 42*43+44*45);
|
|
expect(parser).toParse("42*43+44*45+46*47+48*49", 42*43+44*45+46*47+48*49);
|
|
expect(parser).toParse("42*43-44*45", 42*43-44*45);
|
|
expect(parser).toParse("42*43-44*45-46*47-48*49", 42*43-44*45-46*47-48*49);
|
|
|
|
/* The "expr" rule */
|
|
expect(parser).toParse("42+43", 42+43);
|
|
|
|
/* Complex test */
|
|
expect(parser).toParse("(1+2)*(3+4)", (1+2)*(3+4));
|
|
});
|
|
|
|
it("handles non-context-free language correctly", function() {
|
|
/* The following parsing expression grammar describes the classic
|
|
* non-context-free language { a^n b^n c^n : n >= 1 }:
|
|
*
|
|
* S ← &(A c) a+ B !(a/b/c)
|
|
* A ← a A? b
|
|
* B ← b B? c
|
|
*/
|
|
var parser = PEG.buildParser([
|
|
'S = &(A "c") a:"a"+ B:B !("a" / "b" / "c") { return a.join("") + B; }',
|
|
'A = a:"a" A:A? b:"b" { return a + A + b; }',
|
|
'B = b:"b" B:B? c:"c" { return b + B + c; }'
|
|
].join("\n"), options);
|
|
|
|
expect(parser).toParse("abc", "abc");
|
|
expect(parser).toParse("aaabbbccc", "aaabbbccc");
|
|
expect(parser).toFailToParse("aabbbccc");
|
|
expect(parser).toFailToParse("aaaabbbccc");
|
|
expect(parser).toFailToParse("aaabbccc");
|
|
expect(parser).toFailToParse("aaabbbbccc");
|
|
expect(parser).toFailToParse("aaabbbcc");
|
|
expect(parser).toFailToParse("aaabbbcccc");
|
|
});
|
|
|
|
it("handles nested comments example correctly", function() {
|
|
/*
|
|
* Begin ← "(*"
|
|
* End ← "*)"
|
|
* C ← Begin N* End
|
|
* N ← C / (!Begin !End Z)
|
|
* Z ← any single character
|
|
*/
|
|
var parser = PEG.buildParser([
|
|
'C = begin:Begin ns:N* end:End { return begin + ns.join("") + end; }',
|
|
'N = C',
|
|
' / !Begin !End z:Z { return z; }',
|
|
'Z = .',
|
|
'Begin = "(*"',
|
|
'End = "*)"'
|
|
].join("\n"), options);
|
|
|
|
expect(parser).toParse("(**)", "(**)");
|
|
expect(parser).toParse("(*abc*)", "(*abc*)");
|
|
expect(parser).toParse("(*(**)*)", "(*(**)*)");
|
|
expect(parser).toParse(
|
|
"(*abc(*def*)ghi(*(*(*jkl*)*)*)mno*)",
|
|
"(*abc(*def*)ghi(*(*(*jkl*)*)*)mno*)"
|
|
);
|
|
});
|
|
});
|
|
});
|
|
});
|