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Jasmine: Convert complex example tests

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redux
David Majda 13 years ago
parent 022a51f94e
commit f61813238d
2 changed files with 113 additions and 111 deletions
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113
spec/generated-parser.spec.js
Unescape Escape View File

@ -621,4 +621,117 @@ describe("generated parser", function() {
}); });
}); });
}); });
/*
* Following examples are from Wikipedia, see
* http://en.wikipedia.org/w/index.php?title=Parsing_expression_grammar&oldid=335106938.
*/
describe("complex examples", function() {
varyAll(function(options) {
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*)"
);
});
});
});
}); });

111
test/compiler-test.js
Unescape Escape View File

@ -216,115 +216,4 @@ testWithVaryingTrackLineAndColumn("start rule", function(options) {
); );
}); });
/*
* Following examples are from Wikipedia, see
* http://en.wikipedia.org/w/index.php?title=Parsing_expression_grammar&oldid=335106938.
*/
testWithVaryingTrackLineAndColumn("arithmetics", function(options) {
/*
* 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;',
' for (var 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;',
' for (var 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("")); }',
' / "(" expr:Expr ")" { return expr; }'
].join("\n"), options);
/* Test "value" rule. */
parses(parser, "0", 0);
parses(parser, "123", 123);
parses(parser, "(42+43)", 42+43);
/* Test "product" rule. */
parses(parser, "42", 42);
parses(parser, "42*43", 42*43);
parses(parser, "42*43*44*45", 42*43*44*45);
parses(parser, "42/43", 42/43);
parses(parser, "42/43/44/45", 42/43/44/45);
/* Test "sum" rule. */
parses(parser, "42*43", 42*43);
parses(parser, "42*43+44*45", 42*43+44*45);
parses(parser, "42*43+44*45+46*47+48*49", 42*43+44*45+46*47+48*49);
parses(parser, "42*43-44*45", 42*43-44*45);
parses(parser, "42*43-44*45-46*47-48*49", 42*43-44*45-46*47-48*49);
/* Test "expr" rule. */
parses(parser, "42+43", 42+43);
/* Complex test */
parses(parser, "(1+2)*(3+4)",(1+2)*(3+4));
});
testWithVaryingTrackLineAndColumn("non-context-free language", function(options) {
/* 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);
parses(parser, "abc", "abc");
parses(parser, "aaabbbccc", "aaabbbccc");
doesNotParse(parser, "aabbbccc");
doesNotParse(parser, "aaaabbbccc");
doesNotParse(parser, "aaabbccc");
doesNotParse(parser, "aaabbbbccc");
doesNotParse(parser, "aaabbbcc");
doesNotParse(parser, "aaabbbcccc");
});
testWithVaryingTrackLineAndColumn("nested comments", function(options) {
/*
* 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);
parses(parser, "(**)", "(**)");
parses(parser, "(*abc*)", "(*abc*)");
parses(parser, "(*(**)*)", "(*(**)*)");
parses(
parser,
"(*abc(*def*)ghi(*(*(*jkl*)*)*)mno*)",
"(*abc(*def*)ghi(*(*(*jkl*)*)*)mno*)"
);
});
})(); })();

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