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go/parser: expressions may have comments

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Thanks to 0xE2.0x9A.0x9B for the patch suggestion.

Fixes #2739.

R=r
CC=golang-dev
https://golang.org/cl/5536071
This commit is contained in:
Robert Griesemer 2012-01-19 13:54:31 -08:00
parent c837e612bd
commit 7b07310a69
1 changed files with 4 additions and 2 deletions
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6
src/pkg/go/parser/interface.go
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@ -135,8 +135,10 @@ func ParseDir(fset *token.FileSet, path string, filter func(os.FileInfo) bool, m
//
func ParseExpr(x string) (ast.Expr, error) {
// parse x within the context of a complete package for correct scopes;
// use //line directive for correct positions in error messages
file, err := ParseFile(token.NewFileSet(), "", "package p;func _(){_=\n//line :1\n"+x+";}", 0)
// use //line directive for correct positions in error messages and put
// x alone on a separate line (handles line comments), followed by a ';'
// to force an error if the expression is incomplete
file, err := ParseFile(token.NewFileSet(), "", "package p;func _(){_=\n//line :1\n"+x+"\n;}", 0)
if err != nil {
return nil, err
}