// ParseExpr is a convenience function for obtaining the AST of an expression x.
// The position information recorded in the AST is undefined. The filename used
// in error messages is the empty string.
//
func ParseExpr(x string) (ast.Expr, error) {
var p parser
p.init(token.NewFileSet(), "", []byte(x), 0)
// Set up pkg-level scopes to avoid nil-pointer errors.
// This is not needed for a correct expression x as the
// parser will be ok with a nil topScope, but be cautious
// in case of an erroneous x.
p.openScope()
p.pkgScope = p.topScope
e := p.parseRhsOrType()
p.closeScope()
assert(p.topScope == nil, "unbalanced scopes")
if p.errors.Len() > 0 {
p.errors.Sort()
return nil, p.errors.Err()
}
return e, nil
}
printer "github.com/DAddYE/igo/to_go"
"github.com/DAddYE/igo/ast"
"github.com/DAddYE/igo/parser"
"github.com/DAddYE/igo/scanner"
"github.com/DAddYE/igo/token"
"io"
"io/ioutil"
"os"
"strings"
)
var (
IgoPositions = make(map[string]*printer.Positions)
igoFileSet = token.NewFileSet() // per process FileSet
igoParserMode parser.Mode
igoPrinterMode printer.Mode
)
func igoReport(err error) {
scanner.PrintError(os.Stderr, err)
exitCode = 2
}
func igoInit() {
igoParserMode = parser.Mode(0)
if *comments {
igoParserMode |= parser.ParseComments
}
igoParserMode |= parser.AllErrors