12761ffcb6
Do a thorough job of parsing json struct tags. Move the code to a place where both mcp and jsonschema can use it. Change-Id: I6c86308834706b12a1e22cd96ae120590f49d3f4 Reviewed-on: https://go-review.googlesource.com/c/tools/+/678757 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Robert Findley <rfindley@google.com>
75 lines
2 KiB
Go
75 lines
2 KiB
Go
// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package util
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import (
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"cmp"
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"iter"
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"reflect"
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"slices"
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"strings"
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)
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// Helpers below are copied from gopls' moremaps package.
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// Sorted returns an iterator over the entries of m in key order.
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func Sorted[M ~map[K]V, K cmp.Ordered, V any](m M) iter.Seq2[K, V] {
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// TODO(adonovan): use maps.Sorted if proposal #68598 is accepted.
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return func(yield func(K, V) bool) {
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keys := KeySlice(m)
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slices.Sort(keys)
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for _, k := range keys {
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if !yield(k, m[k]) {
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break
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}
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}
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}
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}
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// KeySlice returns the keys of the map M, like slices.Collect(maps.Keys(m)).
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func KeySlice[M ~map[K]V, K comparable, V any](m M) []K {
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r := make([]K, 0, len(m))
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for k := range m {
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r = append(r, k)
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}
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return r
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}
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type JSONInfo struct {
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Omit bool // unexported or first tag element is "-"
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Name string // Go field name or first tag element. Empty if Omit is true.
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Settings map[string]bool // "omitempty", "omitzero", etc.
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}
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// FieldJSONInfo reports information about how encoding/json
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// handles the given struct field.
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// If the field is unexported, JSONInfo.Omit is true and no other JSONInfo field
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// is populated.
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// If the field is exported and has no tag, then Name is the field's name and all
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// other fields are false.
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// Otherwise, the information is obtained from the tag.
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func FieldJSONInfo(f reflect.StructField) JSONInfo {
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if !f.IsExported() {
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return JSONInfo{Omit: true}
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}
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info := JSONInfo{Name: f.Name}
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if tag, ok := f.Tag.Lookup("json"); ok {
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name, rest, found := strings.Cut(tag, ",")
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// "-" means omit, but "-," means the name is "-"
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if name == "-" && !found {
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return JSONInfo{Omit: true}
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}
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if name != "" {
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info.Name = name
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}
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if len(rest) > 0 {
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info.Settings = map[string]bool{}
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for _, s := range strings.Split(rest, ",") {
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info.Settings[s] = true
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}
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}
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}
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return info
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}
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