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doc-snippet.go
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doc-snippet.go
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package snippets
import (
"go/ast"
"margo.sh/golang/cursor"
"margo.sh/golang/goutil"
"margo.sh/mg"
"margo.sh/mgutil"
yotsuba "margo.sh/why_would_you_make_yotsuba_cry"
)
func DocSnippet(cx *cursor.CurCtx) []mg.Completion {
if cx.Doc == nil {
return nil
}
var ids []*ast.Ident
var addNames func(n ast.Node)
addFieldNames := func(fl *ast.FieldList) {
if fl == nil {
return
}
for _, f := range fl.List {
ids = append(ids, f.Names...)
addNames(f.Type)
}
}
addNames = func(n ast.Node) {
if yotsuba.IsNil(n) {
return
}
switch x := n.(type) {
case *ast.GenDecl:
for _, spec := range x.Specs {
addNames(spec)
}
case *ast.SelectorExpr:
addNames(x.Sel)
addNames(x.X)
case *ast.Ident:
ids = append(ids, x)
case *ast.File:
ids = append(ids, x.Name)
case *ast.FieldList:
addFieldNames(x)
case *ast.Field:
addNames(x.Type)
ids = append(ids, x.Names...)
case *ast.TypeSpec:
ids = append(ids, x.Name)
case *ast.FuncDecl:
ids = append(ids, x.Name)
addFieldNames(x.Recv)
if t := x.Type; t != nil {
addFieldNames(t.Params)
addFieldNames(t.Results)
}
case *ast.ValueSpec:
addNames(x.Type)
ids = append(ids, x.Names...)
}
}
addNames(cx.Doc.Node)
pfx := ""
// we use View.Pos because cx.Pos might have been changed
if i := cx.View.Pos; 0 <= i && i < len(cx.Src) {
i = mgutil.RepositionLeft(cx.Src, i, goutil.IsLetter) - 1
if r := cx.Src[i]; r != ' ' && r != '.' {
pfx = " "
}
}
sfx := " "
if i := cx.View.Pos; 0 <= i && i < len(cx.Src) && cx.Src[i] == ' ' {
sfx = ""
}
seen := map[string]bool{}
cl := make([]mg.Completion, 0, len(ids))
for _, id := range ids {
if id == nil || id.Name == "_" || seen[id.Name] {
continue
}
seen[id.Name] = true
cl = append(cl, mg.Completion{
Query: id.Name,
Src: pfx + id.Name + sfx + `$0`,
})
}
return cl
}