Method loadFile

stack/source.go:60–90

loadFile loads a Go source file and parses the AST tree.

(fileName string)

// loadFile loads a Go source file and parses the AST tree.
func (c *cacheAST) loadFile(fileName string) error {
	if fileName == "" {
		return nil
	}
	if _, ok := c.parsed[fileName]; ok {
		return nil
	}
	// Do not attempt to parse the same file twice.
	c.parsed[fileName] = nil

	if !strings.HasSuffix(fileName, ".go") {
		// Ignore C and assembly.
		return fmt.Errorf("cannot load non-go file %q", fileName)
	}
	/* #nosec G304 */
	src, err := os.ReadFile(fileName)
	if err != nil {
		return err
	}
	c.files[fileName] = src
	fset := token.NewFileSet()
	parsed, err := parser.ParseFile(fset, fileName, src, 0)
	if err != nil {
		return fmt.Errorf("failed to parse %w", err)
	}
	c.parsed[fileName] = &parsedFile{
		lineToByteOffset: lineToByteOffsets(src),
		parsed:           parsed,
	}
	return nil
}

// lineToByteOffsets extract the line number into raw file offset.
//