You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
pegjs/test/checks-test.js

69 lines
1.5 KiB
JavaScript

(function() {
module("PEG.compiler.checks");
test("reports missing referenced rules", function() {
var grammars = [
'start = missing',
'start = missing / "a" / "b"',
'start = "a" / "b" / missing',
'start = missing "a" "b"',
'start = "a" "b" missing',
'start = label:missing',
'start = &missing',
'start = !missing',
'start = missing?',
'start = missing*',
'start = missing+',
'start = missing { }'
];
for (var i = 0; i < grammars.length; i++) {
raises(
function() {
var ast = PEG.parser.parse(grammars[i]);
PEG.compiler.checks.missingReferencedRules(ast);
},
function(e) {
return e instanceof PEG.GrammarError
&& e.message === "Referenced rule \"missing\" does not exist.";
}
);
}
});
test("reports left recursion", function() {
var grammars = [
/* Direct */
'start = start',
'start = start / "a" / "b"',
'start = "a" / "b" / start',
'start = start "a" "b"',
'start = label:start',
'start = &start',
'start = !start',
'start = start?',
'start = start*',
'start = start+',
'start = start { }',
/* Indirect */
'start = stop; stop = start'
];
for (var i = 0; i < grammars.length; i++) {
raises(
function() {
var ast = PEG.parser.parse(grammars[i]);
PEG.compiler.checks.leftRecursion(ast);
},
function(e) {
return e instanceof PEG.GrammarError
&& e.message === "Left recursion detected for rule \"start\".";
}
);
}
});
})();