func parseExprListClosed(p *parser, closeWith string) *ast.ExprList {
ret := new(ast.ExprList)
for {
expr := p.parseExpr()
if expr == nil {
return nil
}
ret.Exprs = append(ret.Exprs, expr)
if p.SeeOp(closeWith) {
return ret
}
comma := p.ExpectOp(",")
if comma == nil {
return nil
}
ret.Commas = append(ret.Commas, comma)
// could be a trailing comma
if p.SeeOp(closeWith) {
return ret
}
}
return ret
}
func buildExprList(b *builder, list *ast.ExprList) tast.Expr {
ret := tast.NewExprList()
if list == nil {
return ret
}
n := list.Len()
if n == 0 {
return ret
}
if n == 1 {
return b.buildExpr(list.Exprs[0])
}
for _, expr := range list.Exprs {
ex := b.buildExpr(expr)
if ex == nil {
return nil
}
ref := ex.R()
if !ref.IsSingle() {
b.Errorf(ast.ExprPos(expr), "cannot put %s in a list", ref)
return nil
}
ret.Append(ex)
}
return ret
}
func buildConstExprList(b *builder, list *ast.ExprList) tast.Expr {
n := list.Len()
if n == 0 {
b.Errorf(ast.ExprPos(list), "const expression list of zero length")
return nil
}
if n == 1 {
return b.buildConst(list.Exprs[0])
}
ret := tast.NewExprList()
for _, expr := range list.Exprs {
ex := b.buildConst(expr)
if ex == nil {
return nil
}
ref := ex.R()
if !ref.IsSingle() {
b.Errorf(ast.ExprPos(expr), "cannot put %s in a list", ref)
return nil
}
ret.Append(ex)
}
return ret
}
func parseExprList(p *parser) *ast.ExprList {
ret := new(ast.ExprList)
for {
expr := p.parseExpr()
if expr == nil {
return nil
}
ret.Exprs = append(ret.Exprs, expr)
if !p.SeeOp(",") {
break
}
ret.Commas = append(ret.Commas, p.Shift())
}
return ret
}
func buildIdentExprList(b *builder, list *ast.ExprList) (
idents []*lex8.Token, firstError ast.Expr,
) {
ret := make([]*lex8.Token, 0, list.Len())
for _, expr := range list.Exprs {
op, ok := expr.(*ast.Operand)
if !ok {
return nil, expr
}
if op.Token.Type != parse.Ident {
return nil, expr
}
ret = append(ret, op.Token)
}
return ret, nil
}