Remove deprecated options (#297)

Removes deprecated fields in `validate.proto`, removes mention of them
from relevant documentation, and replaces usages in the conformance
suite with the proper up-to-date options.

**This is a breaking change.**

Runtime PRs:
- Go: bufbuild/protovalidate-go#178
- C++: bufbuild/protovalidate-cc#69
- Python: bufbuild/protovalidate-python#246
- Java: bufbuild/protovalidate-java#235

Author: jchadwick-buf

MODULE.bazel

@@ -34,6 +34,5 @@ use_repo(go_deps, "com_github_bufbuild_protocompile", "com_github_spf13_pflag",
 
 buf = use_extension("@rules_buf//buf:extensions.bzl", "buf")
 buf.toolchains(
-    sha256 = "bb9d7b4a1fc9ddebc285faa09b9c3e4ce176b94585a1d7988371d73b208aa0f5",
-    version = "v1.35.0",
+    version = "v1.50.0",
 )

MODULE.bazel.lock

@@ -70,7 +70,7 @@ load("@rules_buf//buf:repositories.bzl", "rules_buf_dependencies", "rules_buf_to
 
 rules_buf_dependencies()
 
-rules_buf_toolchains(version = "v1.35.0")
+rules_buf_toolchains(version = "v1.50.0")
 
 load("@rules_buf//gazelle/buf:repositories.bzl", "gazelle_buf_dependencies")
 

WORKSPACE

@@ -99,9 +99,8 @@ proper validations for each field type:
 ```protobuf
 message FieldConstraints {
   repeated Constraint cel = 23;
-  bool skipped = 24;
   bool required = 25;
-  bool ignore_empty = 26;
+  Ignore ignore = 27;
   oneof type {
     // Scalar Field Types
     // ...
@@ -212,13 +211,13 @@ message Event {
 
 ### Other constraints
 
-`FieldConstraints` contains other constraints that can be applied to fields
-including `skipped`, `required`, and `ignore_empty`. 
+`FieldConstraints` contains other constraints that can be applied to fields,
+including `required` and `ignore`. 
 
 ```protobuf
 message Event {
   int64 start_time = 1 [(buf.validate.field).required = true];
-  int64 end_time = 2[(buf.validate.field).ignore_empty = true];
+  int64 end_time = 2[(buf.validate.field).ignore = IGNORE_IF_UNPOPULATED];
 }
 ```
 

docs/standard-constraints.md

@@ -4,7 +4,7 @@ deps:
   - buf.build/bufbuild/protovalidate
 lint:
   use:
-    - DEFAULT
+    - STANDARD
   except:
     - DIRECTORY_SAME_PACKAGE
     - PACKAGE_DEFINED

examples/buf.yaml

@@ -25,9 +25,9 @@ message SubmitFeedbackRequest {
   string feedback = 1;
   // email is the email.
   string email = 2 [
-    // `ignore_empty` skips validation on a field if it's empty.
-    // The email will be not validated if it's empty.
-    (buf.validate.field).ignore_empty = true,
+    // `IGNORE_IF_UNPOPULATED` skips validation on a field if it's unpopulated.
+    // The email will be not validated if it's the empty string.
+    (buf.validate.field).ignore = IGNORE_IF_UNPOPULATED,
     // `string.email` validates that a string field is a valid email.
     (buf.validate.field).string.email = true
   ];

examples/option_field_ignore_empty.proto

@@ -23,8 +23,8 @@ service CarService {
 
 message SearchCarRequest {
   optional fixed32 number_of_seats = 1 [(buf.validate.field) = {
-    // `ignore_empty` skips validation if the field isn't set.
-    ignore_empty: true
+    // `IGNORE_IF_UNPOPULATED` skips validation if the field isn't set.
+    ignore: IGNORE_IF_UNPOPULATED
     fixed32: {
       // `in` requires that the value must be one of the specified values.
       // In this case, it validates that the number of seats is either 5 or 7.

examples/option_number_allow_values.proto

@@ -37,7 +37,7 @@ message CreateReviewRequest {
 message CreateReviewResponse {
   // aggregated_review is the aggregated review after this one in request is created.
   // This value is empty if there are less than a 100 reviews submitted.
-  AggregatedReview aggregated_review = 1 [(buf.validate.field).ignore_empty = true];
+  AggregatedReview aggregated_review = 1 [(buf.validate.field).ignore = IGNORE_IF_UNPOPULATED];
 }
 
 message AggregatedReview {

examples/option_number_range.proto

@@ -29,7 +29,7 @@ message UserProfile {
       // must match it.
       pattern: "^(\\+\\d{1,2}\\s)?\\(?\\d{3}\\)?[\\s.-]\\d{3}[\\s.-]\\d{4}$"
     }
-    ignore_empty: true
+    ignore: IGNORE_IF_UNPOPULATED
   }];
   // `hostname` specifies that the field value must be a valid hostname as defined
   // by [RFC 1034](https://tools.ietf.org/html/rfc1034#section-3.5).
@@ -43,7 +43,7 @@ message UserProfile {
     // defined by [RFC 3986](https://tools.ietf.org/html/rfc3986#section-3).
     // (buf.validate.field).string.uri_ref = true,
     (buf.validate.field).string.uri = true,
-    (buf.validate.field).ignore_empty = true
+    (buf.validate.field).ignore = IGNORE_IF_UNPOPULATED
   ];
   // `ip` specifies that a string field must be a valid ip address, in either v4 or v6.
   string last_login_at = 6 [(buf.validate.field).string.ip = true];

examples/option_string_match_pattern.proto

@@ -12,7 +12,7 @@ breaking:
     - buf/validate/conformance
 lint:
   use:
-    - DEFAULT
+    - STANDARD
   except:
     - PROTOVALIDATE
   ignore_only: