diff options
Diffstat (limited to 'vendor/github.com/go-git/gcfg/read.go')
-rw-r--r-- | vendor/github.com/go-git/gcfg/read.go | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/vendor/github.com/go-git/gcfg/read.go b/vendor/github.com/go-git/gcfg/read.go new file mode 100644 index 000000000..4dfdc5cf3 --- /dev/null +++ b/vendor/github.com/go-git/gcfg/read.go @@ -0,0 +1,273 @@ +package gcfg + +import ( + "fmt" + "io" + "io/ioutil" + "os" + "strings" + + "github.com/go-git/gcfg/scanner" + "github.com/go-git/gcfg/token" + "gopkg.in/warnings.v0" +) + +var unescape = map[rune]rune{'\\': '\\', '"': '"', 'n': '\n', 't': '\t', 'b': '\b'} + +// no error: invalid literals should be caught by scanner +func unquote(s string) string { + u, q, esc := make([]rune, 0, len(s)), false, false + for _, c := range s { + if esc { + uc, ok := unescape[c] + switch { + case ok: + u = append(u, uc) + fallthrough + case !q && c == '\n': + esc = false + continue + } + panic("invalid escape sequence") + } + switch c { + case '"': + q = !q + case '\\': + esc = true + default: + u = append(u, c) + } + } + if q { + panic("missing end quote") + } + if esc { + panic("invalid escape sequence") + } + return string(u) +} + +func read(c *warnings.Collector, callback func(string, string, string, string, bool) error, + fset *token.FileSet, file *token.File, src []byte) error { + // + var s scanner.Scanner + var errs scanner.ErrorList + s.Init(file, src, func(p token.Position, m string) { errs.Add(p, m) }, 0) + sect, sectsub := "", "" + pos, tok, lit := s.Scan() + errfn := func(msg string) error { + return fmt.Errorf("%s: %s", fset.Position(pos), msg) + } + for { + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + switch tok { + case token.EOF: + return nil + case token.EOL, token.COMMENT: + pos, tok, lit = s.Scan() + case token.LBRACK: + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + if tok != token.IDENT { + if err := c.Collect(errfn("expected section name")); err != nil { + return err + } + } + sect, sectsub = lit, "" + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + if tok == token.STRING { + sectsub = unquote(lit) + if sectsub == "" { + if err := c.Collect(errfn("empty subsection name")); err != nil { + return err + } + } + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + } + if tok != token.RBRACK { + if sectsub == "" { + if err := c.Collect(errfn("expected subsection name or right bracket")); err != nil { + return err + } + } + if err := c.Collect(errfn("expected right bracket")); err != nil { + return err + } + } + pos, tok, lit = s.Scan() + if tok != token.EOL && tok != token.EOF && tok != token.COMMENT { + if err := c.Collect(errfn("expected EOL, EOF, or comment")); err != nil { + return err + } + } + // If a section/subsection header was found, ensure a + // container object is created, even if there are no + // variables further down. + err := c.Collect(callback(sect, sectsub, "", "", true)) + if err != nil { + return err + } + case token.IDENT: + if sect == "" { + if err := c.Collect(errfn("expected section header")); err != nil { + return err + } + } + n := lit + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + return errs.Err() + } + blank, v := tok == token.EOF || tok == token.EOL || tok == token.COMMENT, "" + if !blank { + if tok != token.ASSIGN { + if err := c.Collect(errfn("expected '='")); err != nil { + return err + } + } + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + if tok != token.STRING { + if err := c.Collect(errfn("expected value")); err != nil { + return err + } + } + v = unquote(lit) + pos, tok, lit = s.Scan() + if errs.Len() > 0 { + if err := c.Collect(errs.Err()); err != nil { + return err + } + } + if tok != token.EOL && tok != token.EOF && tok != token.COMMENT { + if err := c.Collect(errfn("expected EOL, EOF, or comment")); err != nil { + return err + } + } + } + err := c.Collect(callback(sect, sectsub, n, v, blank)) + if err != nil { + return err + } + default: + if sect == "" { + if err := c.Collect(errfn("expected section header")); err != nil { + return err + } + } + if err := c.Collect(errfn("expected section header or variable declaration")); err != nil { + return err + } + } + } + panic("never reached") +} + +func readInto(config interface{}, fset *token.FileSet, file *token.File, + src []byte) error { + // + c := warnings.NewCollector(isFatal) + firstPassCallback := func(s string, ss string, k string, v string, bv bool) error { + return set(c, config, s, ss, k, v, bv, false) + } + err := read(c, firstPassCallback, fset, file, src) + if err != nil { + return err + } + secondPassCallback := func(s string, ss string, k string, v string, bv bool) error { + return set(c, config, s, ss, k, v, bv, true) + } + err = read(c, secondPassCallback, fset, file, src) + if err != nil { + return err + } + return c.Done() +} + +// ReadWithCallback reads gcfg formatted data from reader and calls +// callback with each section and option found. +// +// Callback is called with section, subsection, option key, option value +// and blank value flag as arguments. +// +// When a section is found, callback is called with nil subsection, option key +// and option value. +// +// When a subsection is found, callback is called with nil option key and +// option value. +// +// If blank value flag is true, it means that the value was not set for an option +// (as opposed to set to empty string). +// +// If callback returns an error, ReadWithCallback terminates with an error too. +func ReadWithCallback(reader io.Reader, callback func(string, string, string, string, bool) error) error { + src, err := ioutil.ReadAll(reader) + if err != nil { + return err + } + + fset := token.NewFileSet() + file := fset.AddFile("", fset.Base(), len(src)) + c := warnings.NewCollector(isFatal) + + return read(c, callback, fset, file, src) +} + +// ReadInto reads gcfg formatted data from reader and sets the values into the +// corresponding fields in config. +func ReadInto(config interface{}, reader io.Reader) error { + src, err := ioutil.ReadAll(reader) + if err != nil { + return err + } + fset := token.NewFileSet() + file := fset.AddFile("", fset.Base(), len(src)) + return readInto(config, fset, file, src) +} + +// ReadStringInto reads gcfg formatted data from str and sets the values into +// the corresponding fields in config. +func ReadStringInto(config interface{}, str string) error { + r := strings.NewReader(str) + return ReadInto(config, r) +} + +// ReadFileInto reads gcfg formatted data from the file filename and sets the +// values into the corresponding fields in config. +func ReadFileInto(config interface{}, filename string) error { + f, err := os.Open(filename) + if err != nil { + return err + } + defer f.Close() + src, err := ioutil.ReadAll(f) + if err != nil { + return err + } + fset := token.NewFileSet() + file := fset.AddFile(filename, fset.Base(), len(src)) + return readInto(config, fset, file, src) +} |