1 files changed, 208 insertions, 0 deletions
diff --git a/libgo/go/go/parser/interface.go b/libgo/go/go/parser/interface.go
new file mode 100644
index 000000000..84d699a67
--- /dev/null
+++ b/libgo/go/go/parser/interface.go
@@ -0,0 +1,208 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file contains the exported entry points for invoking the parser.
+
+package parser
+
+import (
+	"bytes"
+	"go/ast"
+	"go/scanner"
+	"go/token"
+	"io"
+	"io/ioutil"
+	"os"
+	pathutil "path"
+)
+
+
+// If src != nil, readSource converts src to a []byte if possible;
+// otherwise it returns an error. If src == nil, readSource returns
+// the result of reading the file specified by filename.
+//
+func readSource(filename string, src interface{}) ([]byte, os.Error) {
+	if src != nil {
+		switch s := src.(type) {
+		case string:
+			return []byte(s), nil
+		case []byte:
+			return s, nil
+		case *bytes.Buffer:
+			// is io.Reader, but src is already available in []byte form
+			if s != nil {
+				return s.Bytes(), nil
+			}
+		case io.Reader:
+			var buf bytes.Buffer
+			_, err := io.Copy(&buf, s)
+			if err != nil {
+				return nil, err
+			}
+			return buf.Bytes(), nil
+		default:
+			return nil, os.ErrorString("invalid source")
+		}
+	}
+
+	return ioutil.ReadFile(filename)
+}
+
+
+func (p *parser) parseEOF() os.Error {
+	p.expect(token.EOF)
+	return p.GetError(scanner.Sorted)
+}
+
+
+// ParseExpr parses a Go expression and returns the corresponding
+// AST node. The fset, filename, and src arguments have the same interpretation
+// as for ParseFile. If there is an error, the result expression
+// may be nil or contain a partial AST.
+//
+func ParseExpr(fset *token.FileSet, filename string, src interface{}) (ast.Expr, os.Error) {
+	data, err := readSource(filename, src)
+	if err != nil {
+		return nil, err
+	}
+
+	var p parser
+	p.init(fset, filename, data, 0)
+	x := p.parseExpr()
+	if p.tok == token.SEMICOLON {
+		p.next() // consume automatically inserted semicolon, if any
+	}
+	return x, p.parseEOF()
+}
+
+
+// ParseStmtList parses a list of Go statements and returns the list
+// of corresponding AST nodes. The fset, filename, and src arguments have the same
+// interpretation as for ParseFile. If there is an error, the node
+// list may be nil or contain partial ASTs.
+//
+func ParseStmtList(fset *token.FileSet, filename string, src interface{}) ([]ast.Stmt, os.Error) {
+	data, err := readSource(filename, src)
+	if err != nil {
+		return nil, err
+	}
+
+	var p parser
+	p.init(fset, filename, data, 0)
+	return p.parseStmtList(), p.parseEOF()
+}
+
+
+// ParseDeclList parses a list of Go declarations and returns the list
+// of corresponding AST nodes. The fset, filename, and src arguments have the same
+// interpretation as for ParseFile. If there is an error, the node
+// list may be nil or contain partial ASTs.
+//
+func ParseDeclList(fset *token.FileSet, filename string, src interface{}) ([]ast.Decl, os.Error) {
+	data, err := readSource(filename, src)
+	if err != nil {
+		return nil, err
+	}
+
+	var p parser
+	p.init(fset, filename, data, 0)
+	return p.parseDeclList(), p.parseEOF()
+}
+
+
+// ParseFile parses the source code of a single Go source file and returns
+// the corresponding ast.File node. The source code may be provided via
+// the filename of the source file, or via the src parameter.
+//
+// If src != nil, ParseFile parses the source from src and the filename is
+// only used when recording position information. The type of the argument
+// for the src parameter must be string, []byte, or io.Reader.
+//
+// If src == nil, ParseFile parses the file specified by filename.
+//
+// The mode parameter controls the amount of source text parsed and other
+// optional parser functionality. Position information is recorded in the
+// file set fset.
+//
+// If the source couldn't be read, the returned AST is nil and the error
+// indicates the specific failure. If the source was read but syntax
+// errors were found, the result is a partial AST (with ast.BadX nodes
+// representing the fragments of erroneous source code). Multiple errors
+// are returned via a scanner.ErrorList which is sorted by file position.
+//
+func ParseFile(fset *token.FileSet, filename string, src interface{}, mode uint) (*ast.File, os.Error) {
+	data, err := readSource(filename, src)
+	if err != nil {
+		return nil, err
+	}
+
+	var p parser
+	p.init(fset, filename, data, mode)
+	return p.parseFile(), p.GetError(scanner.NoMultiples) // parseFile() reads to EOF
+}
+
+
+// ParseFiles calls ParseFile for each file in the filenames list and returns
+// a map of package name -> package AST with all the packages found. The mode
+// bits are passed to ParseFile unchanged. Position information is recorded
+// in the file set fset.
+//
+// Files with parse errors are ignored. In this case the map of packages may
+// be incomplete (missing packages and/or incomplete packages) and the first
+// error encountered is returned.
+//
+func ParseFiles(fset *token.FileSet, filenames []string, mode uint) (pkgs map[string]*ast.Package, first os.Error) {
+	pkgs = make(map[string]*ast.Package)
+	for _, filename := range filenames {
+		if src, err := ParseFile(fset, filename, nil, mode); err == nil {
+			name := src.Name.Name
+			pkg, found := pkgs[name]
+			if !found {
+				pkg = &ast.Package{name, nil, make(map[string]*ast.File)}
+				pkgs[name] = pkg
+			}
+			pkg.Files[filename] = src
+		} else if first == nil {
+			first = err
+		}
+	}
+	return
+}
+
+
+// ParseDir calls ParseFile for the files in the directory specified by path and
+// returns a map of package name -> package AST with all the packages found. If
+// filter != nil, only the files with os.FileInfo entries passing through the filter
+// are considered. The mode bits are passed to ParseFile unchanged. Position
+// information is recorded in the file set fset.
+//
+// If the directory couldn't be read, a nil map and the respective error are
+// returned. If a parse error occurred, a non-nil but incomplete map and the
+// error are returned.
+//
+func ParseDir(fset *token.FileSet, path string, filter func(*os.FileInfo) bool, mode uint) (map[string]*ast.Package, os.Error) {
+	fd, err := os.Open(path, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	defer fd.Close()
+
+	list, err := fd.Readdir(-1)
+	if err != nil {
+		return nil, err
+	}
+
+	filenames := make([]string, len(list))
+	n := 0
+	for i := 0; i < len(list); i++ {
+		d := &list[i]
+		if filter == nil || filter(d) {
+			filenames[n] = pathutil.Join(path, d.Name)
+			n++
+		}
+	}
+	filenames = filenames[0:n]
+
+	return ParseFiles(fset, filenames, mode)
+}