113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
package file
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import "os"
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import "bufio"
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// File represents a read only file that can print out formatted errors.
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type File struct {
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path string
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file *os.File
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reader *bufio.Reader
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currentLine int
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currentColumn int
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lines []string
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}
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// Open opens the file specified by path and returns a new File struct.
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func Open (path string) (file *File, err error) {
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file = &File {
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path: path,
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lines: []string { "" },
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}
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file.file, err = os.OpenFile(path, os.O_RDONLY, 0660)
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if err != nil { return }
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file.reader = bufio.NewReader(file.file)
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return
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}
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// Stat returns the FileInfo structure describing file. If there is an error, it
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// will be of type *PathError.
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func (file *File) Stat () (fileInfo os.FileInfo, err error) {
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return file.file.Stat()
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}
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// Read reads up to len(bytes) bytes from the File and stores them in bytes. It
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// returns the number of bytes read and any error encountered. At end of file,
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// Read returns 0, io.EOF. This method stores all data read into the file struct
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// so it can be used later for error reporting.
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func (file *File) Read (bytes []byte) (amountRead int, err error) {
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amountRead, err = file.reader.Read(bytes)
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// store the character in the file
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for _, char := range bytes {
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if char == '\n' {
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file.lines = append(file.lines, "")
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file.currentLine ++
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file.currentColumn = 0
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} else {
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file.lines[file.currentLine] += string(char)
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file.currentColumn ++
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}
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}
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return
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}
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// ReadRune reads a single UTF-8 encoded Unicode character and returns the rune
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// and its size in bytes. If the encoded rune is invalid, it consumes one byte
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// and returns unicode.ReplacementChar (U+FFFD) with a size of 1.
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func (file *File) ReadRune () (char rune, size int, err error) {
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char, size, err = file.reader.ReadRune()
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if char == '\n' {
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file.lines = append(file.lines, "")
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file.currentLine ++
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file.currentColumn = 0
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} else {
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file.lines[file.currentLine] += string(char)
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file.currentColumn ++
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}
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return
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}
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// ReadString reads until the first occurrence of delimiter in the input,
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// returning a string containing the data up to and including the delimiter. If
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// ReadString encounters an error before finding a delimiter, it returns the
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// data read before the error and the error itself (often io.EOF). ReadString
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// returns err != nil if and only if the returned data does not end in delim.
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func (file *File) ReadString (delimiter byte) (read string, err error) {
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read, err = file.reader.ReadString(delimiter)
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// store the character in the file
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for _, char := range read {
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if char == '\n' {
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file.lines = append(file.lines, "")
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file.currentLine ++
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file.currentColumn = 0
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} else {
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file.lines[file.currentLine] += string(char)
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file.currentColumn ++
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}
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}
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return
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}
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// Close closes the file. After the file is closed, data that has been read will
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// still be retained, and errors can be reported.
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func (file *File) Close () {
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file.file.Close()
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}
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// Location returns a location struct describing the current position inside of
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// the file. This can be stored and used to print errors.
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func (file *File) Location () (location Location) {
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return Location {
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file: file,
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row: file.currentLine,
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column: file.currentColumn,
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}
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}
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