CODEWITHSUNDEEP
javaprotocol-buffersprotoc
Dmytro Hrankin
Dmytro Hrankin

Reputation: 105

Protobuf field names with numbers are capitalized in a unexpected way

I have a message:

message Image {

    string link_40dp = 1;
}

After the compilation, in Java, the field name is link40Dp (the first letter after a number is capitalized). But, I am expecting, that the field name would be link40dp (d in lower case).

Is it expected behavior or bug? Are there other corner-cases like this?

I am using Protobuf Gradle Plugin v0.8.5 and Protoc v3.6.1 to generate messages in Java.

Upvotes: 3

Views: 2756

Answers (2)

Dmytro Hrankin
Dmytro Hrankin

Reputation: 105

I went through sources and found that it is the expected behavior.

See the code of the capitalization. All the capitalization rules can be found in the code snippet.

Upvotes: 1

Joop Eggen
Joop Eggen

Reputation: 109567

The field name was converted from snake case (with underscores) to camel case (with syllable capitals).

Hence for link_40dp camel case would deliver "link" + capitalize("40dp"). Where capitalize(string) would turn the first letter into a capital.

The Apache commons library would capitalize "40dp" as "40dp" (no change) I think, but evidently here a "smarter" capitalize skips the digits.

This at least signals that the original string contained an underscore: link_40dp, link4_0dp or link40_dp.

So it is an expected behavior, though rather unexpected.

Upvotes: 3

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