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Behavior specs cleanup: Improve simple predicate specs

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This commit is contained in:
David Majda 2015-01-16 16:24:42 +01:00
parent 52144e48cb
commit 548209b48b
1 changed files with 50 additions and 22 deletions
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72
spec/behavior/generated-parser-behavior.spec.js
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@ -682,44 +682,72 @@ describe("generated parser behavior", function() {
}); });
describe("positive simple predicate", function() { describe("positive simple predicate", function() {
it("matches correctly", function() { describe("when the expression matches", function() {
var parser = PEG.buildParser('start = &"a" "a"', options); it("returns |undefined|", function() {
var parser = PEG.buildParser('start = &"a" "a"', options);
expect(parser).toParse("a", [undefined, "a"]); expect(parser).toParse("a", [undefined, "a"]);
expect(parser).toFailToParse("b"); });
it("resets parse position", function() {
var parser = PEG.buildParser('start = &"a" "a"', options);
expect(parser).toParse("a");
});
}); });
it("does not advance position on success", function() { describe("when the expression doesn't match", function() {
var parser = PEG.buildParser('start = &"a" "a"', options); it("reports match failure", function() {
var parser = PEG.buildParser('start = &"a"', options);
expect(parser).toParse("a", [undefined, "a"]); expect(parser).toFailToParse("b");
}); });
it("does not influence expected strings on failure", function() { it("discards any expectations recorded when matching the expression", function() {
var parser = PEG.buildParser('start = &"a"', options); var parser = PEG.buildParser('start = "a" / &"b" / "c"', options);
expect(parser).toFailToParse("b", { expected: [] }); expect(parser).toFailToParse("d", {
expected: [
{ type: "literal", value: "a", description: '"a"' },
{ type: "literal", value: "c", description: '"c"' }
]
});
});
}); });
}); });
describe("negative simple predicate", function() { describe("negative simple predicate", function() {
it("matches correctly", function() { describe("when the expression matches", function() {
var parser = PEG.buildParser('start = !"a" "b"', options); it("reports match failure", function() {
var parser = PEG.buildParser('start = !"a"', options);
expect(parser).toParse("b", [undefined, "b"]); expect(parser).toFailToParse("a");
expect(parser).toFailToParse("a"); });
}); });
it("does not advance position on failure", function() { describe("when the expression doesn't match", function() {
var parser = PEG.buildParser('start = !"a" / "a"', options); it("returns |undefined|", function() {
var parser = PEG.buildParser('start = !"a" "b"', options);
expect(parser).toParse("a", "a"); expect(parser).toParse("b", [undefined, "b"]);
}); });
it("does not influence expected strings on failure", function() { it("resets parse position", function() {
var parser = PEG.buildParser('start = !"a"', options); var parser = PEG.buildParser('start = !"a" "b"', options);
expect(parser).toFailToParse("a", { expected: [] }); expect(parser).toParse("b");
});
it("discards any expectations recorded when matching the expression", function() {
var parser = PEG.buildParser('start = "a" / !"b" / "c"', options);
expect(parser).toFailToParse("b", {
expected: [
{ type: "literal", value: "a", description: '"a"' },
{ type: "literal", value: "c", description: '"c"' }
]
});
});
}); });
}); });