mirror of https://github.com/AMT-Cheif/drift.git
Support nested CASE expressions (#609)
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@ -31,13 +31,13 @@ mixin ExpressionParser on ParserBase {
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final whenExpr = _or();
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_consume(TokenType.then, 'Expected THEN');
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final then = _or();
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final then = expression();
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whens.add(WhenComponent(when: whenExpr, then: then)
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..setSpan(whenToken, _previous));
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}
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if (_matchOne(TokenType.$else)) {
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$else = _or();
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$else = expression();
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}
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_consume(TokenType.end, 'Expected END to finish the case operator');
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@ -65,6 +65,35 @@ final Map<String, Expression> _testCases = {
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],
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elseExpr: Reference(columnName: 'e'),
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),
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'CASE WHEN a THEN '
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'CASE WHEN b THEN c ELSE d END '
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'ELSE '
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'CASE WHEN e THEN f ELSE g END '
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'END': CaseExpression(
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whens: [
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WhenComponent(
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when: Reference(columnName: 'a'),
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then: CaseExpression(
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whens: [
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WhenComponent(
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when: Reference(columnName: 'b'),
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then: Reference(columnName: 'c'),
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),
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],
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elseExpr: Reference(columnName: 'd'),
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),
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),
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],
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elseExpr: CaseExpression(
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whens: [
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WhenComponent(
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when: Reference(columnName: 'e'),
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then: Reference(columnName: 'f'),
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),
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],
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elseExpr: Reference(columnName: 'g'),
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),
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),
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"x NOT LIKE '%A%\$' ESCAPE '\$'": StringComparisonExpression(
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not: true,
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left: Reference(columnName: 'x'),
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