061a086641
The actual change is in src/mongo/shell/collection.js with the remaining changes
to adjust tests to the new api.
The "ideal" arguments are now an array of pipeline ops and an optional object
with extra top-level options for the command (such as {explain: true}. For
backwards compatibility, we still support the varargs style where each argument
is a pipeline stage, but there is no way to specify extra parameters in this
mode.
40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
// $substr returns an empty string if the position argument is out of bounds. SERVER-6186
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t = db.jstests_aggregation_server6186;
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t.drop();
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t.save( {} );
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function substr( string, pos, n ) {
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return t.aggregate( { $project:{ a:{ $substr:[ string, pos, n ] } } } ).toArray()[ 0 ].a;
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}
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function expectedSubstr( string, pos, n ) {
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if ( pos < 0 ) {
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// A negative value is interpreted as a large unsigned int, and is expected to be out of
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// bounds.
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return "";
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}
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if ( n < 0 ) {
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// A negative value is interpreted as a large unsigned int, expected to exceed the length
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// of the string. Passing the string length is functionally equivalent.
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n = string.length;
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}
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return string.substring( pos, pos + n );
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}
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function assertSubstr( string, pos, n ) {
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assert.eq( expectedSubstr( string, pos, n ), substr( string, pos, n ) );
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}
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function checkVariousSubstrings( string ) {
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for( pos = -2; pos < 5; ++pos ) {
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for( n = -2; n < 7; ++n ) {
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assertSubstr( string, pos, n );
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}
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}
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}
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checkVariousSubstrings( "abc" );
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checkVariousSubstrings( "" );
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