Adding support for handling YAML Merge Key (#41) - proper keys comparison for merging #1279
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Support for YAML Merge keys ( <<: [*dict1, *dict2] ) is added. The merge key is a specific scalar with value << (and tag !!merge) that implies that during node construction, the map (or sequence of maps) are merged into the current map. The priority rules are that each key from maps within the value associated with << are added iff the key is not yet present in the current map (and first map gets higher priority). Test cases have been added accordingly.
This was referenced May 3, 2024
…the node) The problem is that const_map_to.get(*j->first) compares only the shared_ptr's, while we need to compare the key itself. v2: remove const iterator v3: fix use-after-free due to const reference
Consider the following YAML:
trait1: &t1
foo: 1
trait2: &t2
foo: 2
merged:
<<: *t1
<<: *t2
yq reports:
$ yq .merged.foo < /tmp/yaml
2
while the order that yaml-cpp returns is different, since it will
firstly handle 1, and will not replace it with 2:
$ util/parse < /tmp/yaml
trait1:
? &1 foo
: &2 1
trait2:
foo: 2
merged:
*1 : *2
(Don't mix up "*2" with "2", it is trait1)
SGSSGene
suggested changes
Aug 22, 2024
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NOTE: this is based on #1243, but includes a fix for proper merging (by comparing the key itself, instead of shared_ptrs, see the last patch).
Support for YAML Merge keys ( <<: [*dict1, *dict2] ) is added. The merge
key is a specific scalar with value << (and tag !!merge) that implies
that during node construction, the map (or sequence of maps) are merged
into the current map. The priority rules are that each key from maps
within the value associated with << are added iff the key is not yet
present in the current map (and first map gets higher priority). Test
cases have been added accordingly.