Proof of concept LSP server

cmd/container.go → adapter/container.go

@@ -1,4 +1,4 @@
-package cmd
+package adapter
 
 import (
 	"io"
@@ -22,6 +22,7 @@ import (
 )
 
 type Container struct {
+	Version        string
 	Config         zk.Config
 	Date           date.Provider
 	Logger         util.Logger
@@ -32,7 +33,7 @@ type Container struct {
 	zkErr          error
 }
 
-func NewContainer() (*Container, error) {
+func NewContainer(version string) (*Container, error) {
 	wrap := errors.Wrapper("initialization")
 
 	config := zk.NewDefaultConfig()
@@ -52,7 +53,8 @@ func NewContainer() (*Container, error) {
 	date := date.NewFrozenNow()
 
 	return &Container{
-		Config: config,
+		Version: version,
+		Config:  config,
 		// zk is short-lived, so we freeze the current date to use the same
 		// date for any template rendering during the execution.
 		Date:     &date,

adapter/lsp/document.go

@@ -0,0 +1,152 @@
+package lsp
+
+import (
+	"regexp"
+	"strings"
+
+	protocol "github.com/tliron/glsp/protocol_3_16"
+	"github.com/tliron/kutil/logging"
+)
+
+// document represents an opened file.
+type document struct {
+	URI     protocol.DocumentUri
+	Content string
+	Log     logging.Logger
+	lines   []string
+}
+
+// ApplyChanges updates the content of the document from LSP textDocument/didChange events.
+func (d *document) ApplyChanges(changes []interface{}) {
+	for _, change := range changes {
+		switch c := change.(type) {
+		case protocol.TextDocumentContentChangeEvent:
+			startIndex, endIndex := c.Range.IndexesIn(d.Content)
+			d.Content = d.Content[:startIndex] + c.Text + d.Content[endIndex:]
+		case protocol.TextDocumentContentChangeEventWhole:
+			d.Content = c.Text
+		}
+	}
+
+	d.lines = nil
+}
+
+var nonEmptyString = regexp.MustCompile(`\S+`)
+
+// WordAt returns the word found at the given location.
+// Credit https://github.com/aca/neuron-language-server/blob/450a7cff71c14e291ee85ff8a0614fa9d4dd5145/utils.go#L13
+func (d *document) WordAt(pos protocol.Position) string {
+	line, ok := d.GetLine(int(pos.Line))
+	if !ok {
+		return ""
+	}
+
+	charIdx := int(pos.Character)
+	wordIdxs := nonEmptyString.FindAllStringIndex(line, -1)
+	for _, wordIdx := range wordIdxs {
+		if wordIdx[0] <= charIdx && charIdx <= wordIdx[1] {
+			return line[wordIdx[0]:wordIdx[1]]
+		}
+	}
+
+	return ""
+}
+
+// GetLine returns the line at the given index.
+func (d *document) GetLine(index int) (string, bool) {
+	lines := d.GetLines()
+	if index < 0 || index > len(lines) {
+		return "", false
+	}
+	return lines[index], true
+}
+
+// GetLines returns all the lines in the document.
+func (d *document) GetLines() []string {
+	if d.lines == nil {
+		// We keep \r on purpose, to avoid messing up position conversions.
+		d.lines = strings.Split(d.Content, "\n")
+	}
+	return d.lines
+}
+
+// LookBehind returns the n characters before the given position, on the same line.
+func (d *document) LookBehind(pos protocol.Position, length int) string {
+	line, ok := d.GetLine(int(pos.Line))
+	if !ok {
+		return ""
+	}
+
+	charIdx := int(pos.Character)
+	if length > charIdx {
+		return line[0:charIdx]
+	}
+	return line[(charIdx - length):charIdx]
+}
+
+var wikiLinkRegex = regexp.MustCompile(`\[?\[\[(.+?)(?:\|(.+?))?\]\]`)
+var markdownLinkRegex = regexp.MustCompile(`\[([^\]]+?[^\\])\]\((.+?[^\\])\)`)
+
+// DocumentLinkAt returns the internal or external link found in the document
+// at the given position.
+func (d *document) DocumentLinkAt(pos protocol.Position) (*documentLink, error) {
+	links, err := d.DocumentLinks()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, link := range links {
+		if positionInRange(d.Content, link.Range, pos) {
+			return &link, nil
+		}
+	}
+
+	return nil, nil
+}
+
+// DocumentLinks returns all the internal and external links found in the
+// document.
+func (d *document) DocumentLinks() ([]documentLink, error) {
+	links := []documentLink{}
+
+	lines := d.GetLines()
+	for lineIndex, line := range lines {
+
+		appendLink := func(href string, start, end int) {
+			if href == "" {
+				return
+			}
+
+			links = append(links, documentLink{
+				Href: href,
+				Range: protocol.Range{
+					Start: protocol.Position{
+						Line:      protocol.UInteger(lineIndex),
+						Character: protocol.UInteger(start),
+					},
+					End: protocol.Position{
+						Line:      protocol.UInteger(lineIndex),
+						Character: protocol.UInteger(end),
+					},
+				},
+			})
+		}
+
+		for _, match := range markdownLinkRegex.FindAllStringSubmatchIndex(line, -1) {
+			href := line[match[4]:match[5]]
+			appendLink(href, match[0], match[1])
+		}
+
+		for _, match := range wikiLinkRegex.FindAllStringSubmatchIndex(line, -1) {
+			href := line[match[2]:match[3]]
+			appendLink(href, match[0], match[1])
+		}
+	}
+
+	return links, nil
+}
+
+type documentLink struct {
+	Href  string
+	Range protocol.Range
+}