cache

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 Go to latest Published: Aug 8, 2026 License: Apache-2.0 Imports: 22 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func NewOverlayFS 

func NewOverlayFS(delegate FileSource) *overlayFS

Types

type Cache 

type Cache struct {
	IncludePaths []string
	// contains filtered or unexported fields
}

func New 

func New(includePaths []string) *Cache

func (*Cache) ID 

func (c *Cache) ID() string

func (Cache) ReadFile 

func (fs Cache) ReadFile(ctx context.Context, uri uri.URI) (FileHandle, error)

ReadFile stats and (maybe) reads the file, updates the cache, and returns it.

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context tracks, per file, its transitive include dependencies. It owns the IncludeGraph; callers never touch the underlying graph directly.

func NewContext 

func NewContext() *Context

NewContext returns an empty context.

func (*Context) Clone 

func (c *Context) Clone() *Context

Clone returns a deep copy, for snapshot copy-on-write.

func (*Context) Dependents 

func (c *Context) Dependents(file uri.URI) []uri.URI

Dependents returns every file that directly or transitively includes file, including file itself when it transitively includes itself. The result is sorted ascending by URI and cycle-safe.

func (*Context) Forget 

func (c *Context) Forget(file uri.URI) []uri.URI

Forget removes file's edges and returns its former dependents.

func (*Context) Register 

func (c *Context) Register(file uri.URI, includes []*syntax.Include, resolve func(uri.URI, string) uri.URI) []uri.URI

Register replaces file's include edges, resolving them via resolve the same way snapshot parsing does. It returns the URIs whose dependency set changed: the union of file's old and new transitive dependents.

Duplicate includes resolve once; unknown include paths fall back to a relative path (see resolver.Resolve) and never crash.

type DiskFile 

type DiskFile struct {
	// contains filtered or unexported fields
}

A DiskFile is a file on the filesystem, or a failure to read one. It implements the source.FileHandle interface.

func (*DiskFile) Content 

func (h *DiskFile) Content() ([]byte, error)

func (*DiskFile) FileIdentity 

func (h *DiskFile) FileIdentity() FileIdentity

func (*DiskFile) Saved 

func (h *DiskFile) Saved() bool

func (*DiskFile) URI 

func (h *DiskFile) URI() uri.URI

func (*DiskFile) Version 

func (h *DiskFile) Version() int32

type FileChange 

type FileChange struct {
	URI     uri.URI
	Version int
	Content []byte
	From    FileChangeType
}

func FileChangeFromLSPDidChange 

func FileChangeFromLSPDidChange(params *protocol.DidChangeTextDocumentParams) []*FileChange

FileChangeFromLSPDidChange converts a didChange payload into file changes. The server advertises whole-document sync, so whole-document events map one-to-one; incremental (partial) events are a client protocol violation and are skipped.

func (*FileChange) FullContent 

func (f *FileChange) FullContent(base []byte) []byte

type FileChangeType 

type FileChangeType string
const (
	FileChangeTypeInitialize FileChangeType = "Initialize"
	FileChangeTypeDidOpen    FileChangeType = "DidOpen"
	FileChangeTypeDidChange  FileChangeType = "DidChange"
	FileChangeTypeDidSave    FileChangeType = "DidSave"
	FileChangeTypeDidClose   FileChangeType = "DidClose"
)

type FileHandle 

type FileHandle interface {
	// URI is the URI for this file handle.
	// TODO(rfindley): this is not actually well-defined. In some cases, there
	// may be more than one URI that resolve to the same FileHandle. Which one is
	// this?
	URI() uri.URI
	// FileIdentity returns a FileIdentity for the file, even if there was an
	// error reading it.
	FileIdentity() FileIdentity
	// Saved reports whether the file has the same content on disk:
	// it is false for files open on an editor with unsaved edits.
	Saved() bool
	// Version returns the file version, as defined by the LSP client.
	// For on-disk file handles, Version returns 0.
	Version() int32
	// Content returns the contents of a file.
	// If the file is not available, returns a nil slice and an error.
	Content() ([]byte, error)
}

A FileHandle represents the URI, content, hash, and optional version of a file tracked by the LSP session.

File content may be provided by the file system (for Saved files) or from an overlay, for open files with unsaved edits. A FileHandle may record an attempt to read a non-existent file, in which case Content returns an error.

type FileID 

type FileID struct {
	// contains filtered or unexported fields
}

A FileID uniquely identifies a file in the file system.

If GetFileID(name1) returns the same ID as GetFileID(name2), the two file names denote the same file. A FileID is comparable, and thus suitable for use as a map key.

func GetFileID 

func GetFileID(filename string) (FileID, time.Time, error)

GetFileID returns the file system's identifier for the file, and its modification time. Like os.Stat, it reads through symbolic links.

type FileIdentity 

type FileIdentity struct {
	URI  uri.URI
	Hash Hash // digest of file contents
}

FileIdentity uniquely identifies a file at a version from a FileSystem.

func (FileIdentity) String 

func (id FileIdentity) String() string

type FileSource 

type FileSource interface {
	// ReadFile returns the FileHandle for a given URI, either by
	// reading the content of the file or by obtaining it from a cache.
	ReadFile(ctx context.Context, uri uri.URI) (FileHandle, error)
}

A FileSource maps URIs to FileHandles.

type FilesMap 

type FilesMap struct {
	// contains filtered or unexported fields
}

FilesMap holds files on disk and overlay files. Snapshots share the underlying maps (Clone is O(1)); the first write after a clone copies copy-on-write.

func (*FilesMap) Clone 

func (m *FilesMap) Clone() *FilesMap

Clone returns a view sharing the same entries. The clone and the original both become copy-on-write.

func (*FilesMap) Forget 

func (m *FilesMap) Forget(key uri.URI)

func (*FilesMap) Get 

func (m *FilesMap) Get(key uri.URI) (FileHandle, bool)

func (*FilesMap) Set 

func (m *FilesMap) Set(key uri.URI, file FileHandle)

type Hash 

type Hash [sha256.Size]byte

func HashOf 

func HashOf(data []byte) Hash

HashOf returns the hash of some data.

func Hashf 

func Hashf(format string, args ...any) Hash

Hashf returns the hash of a printf-formatted string.

func (Hash) Less 

func (h Hash) Less(other Hash) bool

Less returns true if the given hash is less than the other.

func (Hash) String 

func (h Hash) String() string

String returns the digest as a string of hex digits.

func (*Hash) XORWith 

func (h *Hash) XORWith(h2 Hash)

XORWith updates *h to *h XOR h2.

type IncludeGraph 

type IncludeGraph struct {
	// contains filtered or unexported fields
}

IncludeGraph tracks include edges between files. Snapshots share the underlying mapper (Clone is O(1)); the first structural change after a clone deep-copies the graph, so edits that do not change include edges never pay for the copy.

func NewIncludeGraph 

func NewIncludeGraph() *IncludeGraph

func (*IncludeGraph) Clone 

func (g *IncludeGraph) Clone() *IncludeGraph

Clone returns a view sharing the same mapper. The clone and the original both become copy-on-write: the next structural change deep-copies.

func (*IncludeGraph) Debug 

func (g *IncludeGraph) Debug()

func (*IncludeGraph) Get 

func (g *IncludeGraph) Get(file uri.URI) *IncludeNode

Get returns a copy of file's node. The graph's nodes are mutated in place by Set and removeWithoutLock, so a live node must never escape the lock.

func (*IncludeGraph) Remove 

func (g *IncludeGraph) Remove(file uri.URI)

func (*IncludeGraph) Set 

func (g *IncludeGraph) Set(file uri.URI, includes []*syntax.Include, resolve func(cur uri.URI, includePath string) uri.URI)

Set records the include edges of file. resolve maps an include path text to the URI of the included file (e.g. the snapshot's include resolver).

type IncludeNode 

type IncludeNode struct {
	// contains filtered or unexported fields
}

func (*IncludeNode) Clone 

func (n *IncludeNode) Clone() *IncludeNode

func (*IncludeNode) InDegree 

func (n *IncludeNode) InDegree() []uri.URI

func (*IncludeNode) OutDegree 

func (n *IncludeNode) OutDegree() []uri.URI

type Overlay 

type Overlay struct {
	// contains filtered or unexported fields
}

An Overlay is a file open in the editor. It may have unsaved edits. It implements the source.FileHandle interface.

func NewOverlay 

func NewOverlay(uri uri.URI, content []byte, version int32) *Overlay

func (*Overlay) Content 

func (o *Overlay) Content() ([]byte, error)

func (*Overlay) FileIdentity 

func (o *Overlay) FileIdentity() FileIdentity

func (*Overlay) Saved 

func (o *Overlay) Saved() bool

func (*Overlay) URI 

func (o *Overlay) URI() uri.URI

func (*Overlay) Version 

func (o *Overlay) Version() int32

type ParseCaches 

type ParseCaches struct {
	// contains filtered or unexported fields
}

ParseCaches maps URIs to parsed files. Snapshots share the underlying map (Clone is O(1)); the first write after a clone copies the map copy-on-write, so cloning per keystroke is cheap while old snapshots stay immutable.

func NewParseCaches 

func NewParseCaches() *ParseCaches

func (*ParseCaches) Clone 

func (c *ParseCaches) Clone() *ParseCaches

Clone returns a view sharing the same entries. The clone and the original both become copy-on-write.

func (*ParseCaches) Forget 

func (c *ParseCaches) Forget(filePath uri.URI)

func (*ParseCaches) Get 

func (c *ParseCaches) Get(filePath uri.URI) *ParsedFile

func (*ParseCaches) Set 

func (c *ParseCaches) Set(filePath uri.URI, res *ParsedFile)

func (*ParseCaches) TokensForFile 

func (c *ParseCaches) TokensForFile(file uri.URI, getIncludes func(uri.URI) []uri.URI) map[string]struct{}

TokensForFile returns tokens for the given file and its transitively included files. Each file's token set is computed once per parse and reused, so typing does not re-walk the include closure's ASTs.

type ParsedFile 

type ParsedFile struct {
	// contains filtered or unexported fields
}

func Parse 

func Parse(fh FileHandle) (*ParsedFile, error)

Parse lexes and parses the file content into a ParsedFile.

func (*ParsedFile) AST 

func (p *ParsedFile) AST() *syntax.Document

func (*ParsedFile) AggregatedError 

func (p *ParsedFile) AggregatedError() error

func (*ParsedFile) Definitions 

func (p *ParsedFile) Definitions() map[string]syntax.Node

Definitions returns the file's top-level definitions indexed by name: structs, unions, exceptions, enums, services, consts, and typedefs. The node's concrete type identifies the definition kind.

func (*ParsedFile) EnumValues 

func (p *ParsedFile) EnumValues() map[string]*syntax.Identifier

EnumValues returns the file's enum value names indexed by name.

func (*ParsedFile) Errors 

func (p *ParsedFile) Errors() []syntax.Error

func (*ParsedFile) Mapper 

func (p *ParsedFile) Mapper() *mapper.Mapper

func (*ParsedFile) Tokens 

func (p *ParsedFile) Tokens() map[string]struct{}

Tokens returns the identifier tokens of the file, computed once and reused. A re-parse replaces the whole ParsedFile, so the cache never goes stale.

type Resolver 

type Resolver struct {
	// contains filtered or unexported fields
}

Resolver provides centralized include path resolution. It wraps the snapshot to provide a clean interface for resolving included files, types, and identifiers.

func NewResolver 

func NewResolver(ss *Snapshot) *Resolver

NewResolver creates a resolver for the given snapshot

func (*Resolver) GetIncludePath 

func (r *Resolver) GetIncludePath(ast *syntax.Document, includeName string) string

GetIncludePath returns the include path text for a given include name. Returns empty string if not found.

func (*Resolver) GetIncludeURI 

func (r *Resolver) GetIncludeURI(cur uri.URI, ast *syntax.Document, includeName string) uri.URI

GetIncludeURI returns the URI for an included file by include name. Returns empty URI if not found.

func (*Resolver) IncludePaths 

func (r *Resolver) IncludePaths() []string

IncludePaths returns the include paths configured for this snapshot

func (*Resolver) ResolveInclude 

func (r *Resolver) ResolveInclude(cur uri.URI, includePath string) uri.URI

ResolveInclude resolves an include path to a file URI. It first tries relative to the current file, then tries each include path.

type Session 

type Session struct {
	// contains filtered or unexported fields
}

func NewSession 

func NewSession(cache *Cache) *Session

func (*Session) AddView 

func (s *Session) AddView(folder uri.URI) *View

AddView registers a view for the workspace folder, returning the existing view when the folder is already tracked.

func (Session) Forget 

func (fs Session) Forget(uri uri.URI)

Forget drops the overlay for uri, falling back to disk content.

func (Session) HasOverlay 

func (fs Session) HasOverlay(uri uri.URI) bool

HasOverlay reports whether uri has an open overlay.

func (Session) Overlays 

func (fs Session) Overlays() []*Overlay

Overlays returns a new unordered array of overlays.

func (Session) ReadFile 

func (fs Session) ReadFile(ctx context.Context, uri uri.URI) (FileHandle, error)

func (*Session) RemoveView 

func (s *Session) RemoveView(folder uri.URI)

RemoveView drops the view for the workspace folder and forgets every cached file-to-view mapping that pointed at it, so ViewOf re-resolves against the remaining folders.

func (Session) Update 

func (fs Session) Update(ctx context.Context, changes []*FileChange) error

Update applies changes to the overlay set. DidClose changes remove the overlay; all other types create or replace it.

func (*Session) UpdateOverlayFS 

func (s *Session) UpdateOverlayFS(ctx context.Context, changes []*FileChange) error

func (*Session) ViewOf 

func (s *Session) ViewOf(fileURI uri.URI) (*View, error)

func (*Session) Views 

func (s *Session) Views() []*View

Views returns the workspace folders' views.

type Snapshot 

type Snapshot struct {
	// contains filtered or unexported fields
}

func BuildSnapshotForTest 

func BuildSnapshotForTest(files []*FileChange) *Snapshot

func BuildSnapshotForTestWithPaths 

func BuildSnapshotForTestWithPaths(includePaths []string, files []*FileChange) *Snapshot

BuildSnapshotForTestWithPaths is BuildSnapshotForTest with configured include paths, for cross-project include resolution tests.

func NewSnapshot 

func NewSnapshot(view *View, includePaths []string) *Snapshot

func (*Snapshot) Acquire 

func (s *Snapshot) Acquire() func()

func (*Snapshot) Dependents 

func (s *Snapshot) Dependents(uri uri.URI) []uri.URI

Dependents returns the transitive dependents of uri: every file that directly or transitively includes it, in this snapshot.

func (*Snapshot) ForgetFile 

func (s *Snapshot) ForgetFile(uri uri.URI)

ForgetFile is called when file changed or removed. It removes file's include edges and drops the parse and file caches for file and every transitive dependent of file: their derived data is rebuilt lazily on the next request, while their content survives on disk (or in the overlay).

func (*Snapshot) Graph 

func (s *Snapshot) Graph() *IncludeGraph

func (*Snapshot) Parse 

func (s *Snapshot) Parse(ctx context.Context, uri uri.URI) (*ParsedFile, error)

func (*Snapshot) ReadFile 

func (s *Snapshot) ReadFile(ctx context.Context, uri uri.URI) (FileHandle, error)

func (*Snapshot) Resolver 

func (s *Snapshot) Resolver() *Resolver

Resolver returns a new Resolver instance for this snapshot. The resolver provides centralized include path resolution.

func (*Snapshot) TokensForFile 

func (s *Snapshot) TokensForFile(file uri.URI) map[string]struct{}

TokensForFile returns the identifier tokens of file and its transitively included files.

type View 

type View struct {
	// contains filtered or unexported fields
}

func NewView 

func NewView(name string, folder uri.URI, fs FileSource, includePaths []string) *View

func (*View) ContainsFile 

func (v *View) ContainsFile(uri uri.URI) bool

func (*View) FileChange 

func (v *View) FileChange(ctx context.Context, changes []*FileChange, postFns ...func(affected []uri.URI))

FileChange applies changes to the view: it swaps in a new snapshot (an O(1) copy-on-write clone) and re-parses the changed files, then runs the postFns asynchronously with the affected URIs (changed files plus their transitive dependents). The request thread never blocks on postFns, so diagnostics-heavy work (semantic analysis) does not stall the editor.

func (*View) FileKnown 

func (v *View) FileKnown(uri uri.URI) bool

func (*View) Folder 

func (v *View) Folder() uri.URI

Folder returns the workspace folder the view covers.

func (*View) IsCurrent 

func (v *View) IsCurrent(ss *Snapshot) bool

IsCurrent reports whether ss is the view's latest snapshot. Used by asynchronous work to drop results that a newer change superseded.

func (*View) KnownFiles 

func (v *View) KnownFiles() []uri.URI

KnownFiles returns the known file URIs of the view, sorted for deterministic iteration.

func (*View) MarkFileKnown 

func (v *View) MarkFileKnown(fileURI uri.URI)

func (*View) Snapshot 

func (v *View) Snapshot() (*Snapshot, func())

Source Files

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