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package langserver
import (
"bufio"
"context"
"encoding/json"
"fmt"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"unicode/utf16"
"github.com/mattn/go-unicodeclass"
"github.com/sourcegraph/jsonrpc2"
)
func (h *langHandler) handleTextDocumentDefinition(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
if req.Params == nil {
return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
}
var params DocumentDefinitionParams
if err := json.Unmarshal(*req.Params, ¶ms); err != nil {
return nil, err
}
return h.definition(params.TextDocument.URI, ¶ms)
}
func (h *langHandler) findTag(fname string, tag string) ([]Location, error) {
f, err := os.Open(fname)
if err != nil {
return nil, err
}
defer f.Close()
locations := []Location{}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
text := scanner.Text()
if strings.HasPrefix(text, "!") {
continue
}
token := strings.SplitN(text, "\t", 4)
if len(token) < 4 {
continue
}
if token[0] == tag {
token[2] = strings.TrimRight(token[2], `;"`)
fullpath := filepath.Clean(filepath.Join(h.rootPath, token[1]))
b, err := os.ReadFile(fullpath)
if err != nil {
continue
}
lines := strings.Split(string(b), "\n")
if strings.HasPrefix(token[2], "/") {
pattern := token[2]
hasPrefix := strings.HasPrefix(pattern, "/^")
if hasPrefix {
pattern = strings.TrimLeft(pattern, "/^")
}
hasSuffix := strings.HasSuffix(pattern, "$/")
if hasSuffix {
pattern = strings.TrimRight(pattern, "$/")
}
for i, line := range lines {
match := false
if hasPrefix && hasSuffix && line == pattern {
match = true
} else if hasPrefix && strings.HasPrefix(line, pattern) {
match = true
} else if hasSuffix && strings.HasSuffix(line, pattern) {
match = true
}
if match {
locations = append(locations, Location{
URI: toURI(fullpath),
Range: Range{
Start: Position{Line: i, Character: 0},
End: Position{Line: i, Character: 0},
},
})
}
}
} else {
i, err := strconv.Atoi(token[2])
if err != nil {
continue
}
locations = append(locations, Location{
URI: toURI(fullpath),
Range: Range{
Start: Position{Line: i - 1, Character: 0},
End: Position{Line: i - 1, Character: 0},
},
})
}
}
}
return locations, nil
}
func (h *langHandler) findTagsFile(fname string) string {
base := filepath.Clean(filepath.Dir(fname))
for {
_, err := os.Stat(filepath.Join(base, "tags"))
if err == nil {
break
}
if base == h.rootPath {
base = ""
break
}
tmp := filepath.Dir(base)
if tmp == "" || tmp == base {
base = ""
break
}
base = tmp
}
return base
}
func (h *langHandler) definition(uri DocumentURI, params *DocumentDefinitionParams) ([]Location, error) {
f, ok := h.files[uri]
if !ok {
return nil, fmt.Errorf("document not found: %v", uri)
}
lines := strings.Split(f.Text, "\n")
if params.Position.Line < 0 || params.Position.Line > len(lines) {
return nil, fmt.Errorf("invalid position: %v", params.Position)
}
chars := utf16.Encode([]rune(lines[params.Position.Line]))
if params.Position.Character < 0 || params.Position.Character > len(chars) {
return nil, fmt.Errorf("invalid position: %v", params.Position)
}
prevPos := 0
currPos := -1
prevCls := unicodeclass.Invalid
for i, char := range chars {
currCls := unicodeclass.Is(rune(char))
if currCls != prevCls {
if i <= params.Position.Character {
prevPos = i
} else {
if char == '_' {
continue
}
currPos = i
break
}
}
prevCls = currCls
}
if currPos == -1 {
currPos = len(chars)
}
tag := string(utf16.Decode(chars[prevPos:currPos]))
fname, err := fromURI(uri)
if err != nil {
return nil, nil
}
fname = filepath.ToSlash(fname)
if runtime.GOOS == "windows" {
fname = strings.ToLower(fname)
}
base := h.findTagsFile(fname)
if base == "" {
return nil, nil
}
return h.findTag(filepath.Join(base, "tags"), tag)
}
|
