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51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
describe("generated parser API", function() {
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describe("parse", function() {
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it("parses input", function() {
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var parser = PEG.buildParser('start = "a"');
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expect(parser.parse("a")).toBe("a");
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});
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it("throws an exception on syntax error", function() {
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var parser = PEG.buildParser('start = "a"');
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expect(function() { parser.parse("b"); }).toThrow();
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});
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describe("start rule", 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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'c = "x" { return "c"; }'
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].join("\n"), { allowedStartRules: ["b", "c"] });
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describe("when |startRule| is not set", function() {
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it("starts parsing from the first allowed rule", function() {
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expect(parser.parse("x")).toBe("b");
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});
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});
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describe("when |startRule| is set to an allowed rule", function() {
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it("starts parsing from the specified rule", function() {
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expect(parser.parse("x", { startRule: "b" })).toBe("b");
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expect(parser.parse("x", { startRule: "c" })).toBe("c");
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});
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});
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describe("when |startRule| is set to a disallowed start rule", function() {
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it("throws an exception", function() {
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expect(
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function() { parser.parse("x", { startRule: "a" }); }
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).toThrow();
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});
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});
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});
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it("accepts custom options", function() {
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var parser = PEG.buildParser('start = "a"');
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parser.parse("a", { foo: 42 });
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});
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});
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});
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