diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/obscuren/otto/parser/parser.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/obscuren/otto/parser/parser.go | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/Godeps/_workspace/src/github.com/obscuren/otto/parser/parser.go b/Godeps/_workspace/src/github.com/obscuren/otto/parser/parser.go deleted file mode 100644 index 37146aee9..000000000 --- a/Godeps/_workspace/src/github.com/obscuren/otto/parser/parser.go +++ /dev/null @@ -1,270 +0,0 @@ -/* -Package parser implements a parser for JavaScript. - - import ( - "github.com/robertkrimen/otto/parser" - ) - -Parse and return an AST - - filename := "" // A filename is optional - src := ` - // Sample xyzzy example - (function(){ - if (3.14159 > 0) { - console.log("Hello, World."); - return; - } - - var xyzzy = NaN; - console.log("Nothing happens."); - return xyzzy; - })(); - ` - - // Parse some JavaScript, yielding a *ast.Program and/or an ErrorList - program, err := parser.ParseFile(nil, filename, src, 0) - -Warning - -The parser and AST interfaces are still works-in-progress (particularly where -node types are concerned) and may change in the future. - -*/ -package parser - -import ( - "bytes" - "errors" - "io" - "io/ioutil" - - "github.com/robertkrimen/otto/ast" - "github.com/robertkrimen/otto/file" - "github.com/robertkrimen/otto/token" -) - -// A Mode value is a set of flags (or 0). They control optional parser functionality. -type Mode uint - -const ( - IgnoreRegExpErrors Mode = 1 << iota // Ignore RegExp compatibility errors (allow backtracking) -) - -type _parser struct { - filename string - str string - length int - base int - - chr rune // The current character - chrOffset int // The offset of current character - offset int // The offset after current character (may be greater than 1) - - idx file.Idx // The index of token - token token.Token // The token - literal string // The literal of the token, if any - - scope *_scope - insertSemicolon bool // If we see a newline, then insert an implicit semicolon - implicitSemicolon bool // An implicit semicolon exists - - errors ErrorList - - recover struct { - // Scratch when trying to seek to the next statement, etc. - idx file.Idx - count int - } - - mode Mode -} - -func _newParser(filename, src string, base int) *_parser { - return &_parser{ - chr: ' ', // This is set so we can start scanning by skipping whitespace - str: src, - length: len(src), - base: base, - } -} - -func newParser(filename, src string) *_parser { - return _newParser(filename, src, 1) -} - -func ReadSource(filename string, src interface{}) ([]byte, error) { - if src != nil { - switch src := src.(type) { - case string: - return []byte(src), nil - case []byte: - return src, nil - case *bytes.Buffer: - if src != nil { - return src.Bytes(), nil - } - case io.Reader: - var bfr bytes.Buffer - if _, err := io.Copy(&bfr, src); err != nil { - return nil, err - } - return bfr.Bytes(), nil - } - return nil, errors.New("invalid source") - } - return ioutil.ReadFile(filename) -} - -// ParseFile parses the source code of a single JavaScript/ECMAScript source file and returns -// the corresponding ast.Program node. -// -// If fileSet == nil, ParseFile parses source without a FileSet. -// If fileSet != nil, ParseFile first adds filename and src to fileSet. -// -// The filename argument is optional and is used for labelling errors, etc. -// -// src may be a string, a byte slice, a bytes.Buffer, or an io.Reader, but it MUST always be in UTF-8. -// -// // Parse some JavaScript, yielding a *ast.Program and/or an ErrorList -// program, err := parser.ParseFile(nil, "", `if (abc > 1) {}`, 0) -// -func ParseFile(fileSet *file.FileSet, filename string, src interface{}, mode Mode) (*ast.Program, error) { - str, err := ReadSource(filename, src) - if err != nil { - return nil, err - } - { - str := string(str) - - base := 1 - if fileSet != nil { - base = fileSet.AddFile(filename, str) - } - - parser := _newParser(filename, str, base) - parser.mode = mode - return parser.parse() - } -} - -// ParseFunction parses a given parameter list and body as a function and returns the -// corresponding ast.FunctionLiteral node. -// -// The parameter list, if any, should be a comma-separated list of identifiers. -// -func ParseFunction(parameterList, body string) (*ast.FunctionLiteral, error) { - - src := "(function(" + parameterList + ") {\n" + body + "\n})" - - parser := _newParser("", src, 1) - program, err := parser.parse() - if err != nil { - return nil, err - } - - return program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.FunctionLiteral), nil -} - -func (self *_parser) slice(idx0, idx1 file.Idx) string { - from := int(idx0) - self.base - to := int(idx1) - self.base - if from >= 0 && to <= len(self.str) { - return self.str[from:to] - } - - return "" -} - -func (self *_parser) parse() (*ast.Program, error) { - self.next() - program := self.parseProgram() - if false { - self.errors.Sort() - } - return program, self.errors.Err() -} - -func (self *_parser) next() { - self.token, self.literal, self.idx = self.scan() -} - -func (self *_parser) optionalSemicolon() { - if self.token == token.SEMICOLON { - self.next() - return - } - - if self.implicitSemicolon { - self.implicitSemicolon = false - return - } - - if self.token != token.EOF && self.token != token.RIGHT_BRACE { - self.expect(token.SEMICOLON) - } -} - -func (self *_parser) semicolon() { - if self.token != token.RIGHT_PARENTHESIS && self.token != token.RIGHT_BRACE { - if self.implicitSemicolon { - self.implicitSemicolon = false - return - } - - self.expect(token.SEMICOLON) - } -} - -func (self *_parser) idxOf(offset int) file.Idx { - return file.Idx(self.base + offset) -} - -func (self *_parser) expect(value token.Token) file.Idx { - idx := self.idx - if self.token != value { - self.errorUnexpectedToken(self.token) - } - self.next() - return idx -} - -func lineCount(str string) (int, int) { - line, last := 0, -1 - pair := false - for index, chr := range str { - switch chr { - case '\r': - line += 1 - last = index - pair = true - continue - case '\n': - if !pair { - line += 1 - } - last = index - case '\u2028', '\u2029': - line += 1 - last = index + 2 - } - pair = false - } - return line, last -} - -func (self *_parser) position(idx file.Idx) file.Position { - position := file.Position{} - offset := int(idx) - self.base - str := self.str[:offset] - position.Filename = self.filename - line, last := lineCount(str) - position.Line = 1 + line - if last >= 0 { - position.Column = offset - last - } else { - position.Column = 1 + len(str) - } - - return position -} |