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package ast
import (
"fmt"
"github.com/robertkrimen/otto/file"
)
// CommentPosition determines where the comment is in a given context
type CommentPosition int
const (
_ CommentPosition = iota
LEADING // Before the pertinent expression
TRAILING // After the pertinent expression
KEY // After a key or keyword
COLON // After a colon in a field declaration
FINAL // Final comments in a block, not belonging to a specific expression or the comment after a trailing , in an array or object literal
TBD
)
// Comment contains the data of the comment
type Comment struct {
Begin file.Idx
Text string
Position CommentPosition
}
// String returns a stringified version of the position
func (cp CommentPosition) String() string {
switch cp {
case LEADING:
return "Leading"
case TRAILING:
return "Trailing"
case KEY:
return "Key"
case COLON:
return "Colon"
case FINAL:
return "Final"
default:
return "???"
}
}
// String returns a stringified version of the comment
func (c Comment) String() string {
return fmt.Sprintf("Comment: %v", c.Text)
}
// CommentMap is the data structure where all found comments are stored
type CommentMap map[Node][]*Comment
// AddComment adds a single comment to the map
func (cm CommentMap) AddComment(node Node, comment *Comment) {
list := cm[node]
list = append(list, comment)
cm[node] = list
}
// AddComments adds a slice of comments, given a node and an updated position
func (cm CommentMap) AddComments(node Node, comments []*Comment, position CommentPosition) {
for _, comment := range comments {
comment.Position = position
cm.AddComment(node, comment)
}
}
// Size returns the size of the map
func (cm CommentMap) Size() int {
size := 0
for _, comments := range cm {
size += len(comments)
}
return size
}
// MoveComments moves comments with a given position from a node to another
func (cm CommentMap) MoveComments(from, to Node, position CommentPosition) {
for i, c := range cm[from] {
if c.Position == position {
cm.AddComment(to, c)
// Remove the comment from the "from" slice
cm[from][i] = cm[from][len(cm[from])-1]
cm[from][len(cm[from])-1] = nil
cm[from] = cm[from][:len(cm[from])-1]
}
}
}
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