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Fix 'oneof' in syntax-directed operations #637

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Fix 'oneof' in syntax-directed operations #637

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311e348
Fix 'oneof' in syntax-directed operations
szuend Mar 10, 2025
e006077
Use subset instead of equality when matching one-of lists for SDOs
szuend Mar 11, 2025
286f296
Change tests so usage of 'one of' makes sense
szuend Mar 12, 2025
50b85b7
Add 'default' branch back in
szuend Mar 13, 2025
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11 changes: 11 additions & 0 deletions src/lint/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,10 @@ export function rhsMatches(a: RightHandSide | OneOfList, b: RightHandSide | OneO
}
return symbolSpanMatches(aHead, bHead);
}
case SyntaxKind.OneOfList:
return oneOfListMatches(a, b as OneOfList);
default:
// @ts-expect-error: Callers might pass other kinds of nodes.
throw new Error('unknown rhs type ' + a.constructor.name);
}
}
Expand Down Expand Up @@ -171,6 +174,14 @@ function argumentListMatches(a: ArgumentList, b: ArgumentList) {
);
}

function oneOfListMatches(a: OneOfList, b: OneOfList) {
if (a.terminals === undefined || b.terminals === undefined) {
throw new Error('OneOfList must have terminals');
}
// The terminals in a must be a subset of the terminals in b.
return a.terminals.every(ae => b.terminals!.find(be => ae.text === be.text));
}

// this is only for use with single-file grammars
export function getLocationInGrammarFile(file: SourceFile, pos: number) {
const posWithoutWhitespace = skipTrivia(file.text, pos, file.text.length);
Expand Down
69 changes: 69 additions & 0 deletions test/errors.js
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Expand Up @@ -1106,6 +1106,31 @@ ${M} </pre>
);
});

it('unknown oneof', async () => {
await assertError(
positioned`
<emu-grammar type="definition">
Foo :: one of \`a\` \`b\` \`c\`
</emu-grammar>

<emu-clause id="sec-example" type="sdo">
<h1>Static Semantics: Example</h1>
<dl class='header'></dl>
<emu-grammar>
Foo :: ${M}one of \`d\` \`e\`
</emu-grammar>
<emu-alg>
1. Return *true*.
</emu-alg>
</emu-clause>`,
{
ruleId: 'grammar-shape',
nodeType: 'emu-grammar',
message: 'could not find definition for rhs "d e"',
},
);
});

it('negative', async () => {
await assertErrorFree(`
<emu-grammar type="definition">
Expand Down Expand Up @@ -1167,5 +1192,49 @@ ${M} </pre>
},
);
});

it('negative: oneof', async () => {
await assertErrorFree(`
<emu-grammar type="definition">
Foo :: one of \`a\` \`b\` \`c\`
</emu-grammar>

<emu-clause id="sec-example" type="sdo">
<h1>Static Semantics: Example</h1>
<dl class='header'></dl>
<emu-grammar>
Foo :: one of \`a\` \`b\` \`c\`
</emu-grammar>
<emu-alg>
1. Return *true*.
</emu-alg>
</emu-clause>
`);
});

it('negative: oneof (subset)', async () => {
await assertErrorFree(`
<emu-grammar type="definition">
Foo :: one of \`a\` \`b\` \`c\` \`d\`
</emu-grammar>

<emu-clause id="sec-example" type="sdo">
<h1>Static Semantics: Example</h1>
<dl class='header'></dl>
<emu-grammar>
Foo :: one of \`a\` \`b\`
</emu-grammar>
<emu-alg>
1. Return *true*.
</emu-alg>
<emu-grammar>
Foo :: one of \`c\` \`d\`
</emu-grammar>
<emu-alg>
1. Return *false*.
</emu-alg>
</emu-clause>
`);
});
});
});