gotools/gopls/internal/cache/port.go

type port …

var preferredPorts …

// matches reports whether the port matches a file with the given absolute path
// and content.
//
// Note that this function accepts content rather than e.g. a file.Handle,
// because we trim content before matching for performance reasons, and
// therefore need to do this outside of matches when considering multiple ports.
func (p port) matches(path string, content []byte) bool { … }

// trimContentForPortMatch trims the given Go file content to a minimal file
// containing the same build constraints, if any.
//
// This is an unfortunate but necessary optimization, as matching build
// constraints using go/build has significant overhead, and involves parsing
// more than just the build constraint.
//
// TestMatchingPortsConsistency enforces consistency by comparing results
// without trimming content.
func trimContentForPortMatch(content []byte) []byte { … }

// buildComment returns the first matching //go:build comment in the given
// content, or "" if none exists.
func buildComment(content []byte) string { … }

// Adapted from go/build/build.go.
//
// TODO(rfindley): use constraint.IsGoBuild once we are on 1.19+.
func isGoBuildComment(line string) bool { … }