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Alternate signing constructs #1

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lmika merged 12 commits from feature/assign into main 2025-05-24 00:12:24 +00:00
Conversation 0 Commits 12 Files changed 12 +48 -14
2 changed files with 48 additions and 14 deletions
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Showing only changes of commit 94aad41712 - Show all commits

13
ucl/ast.go
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@ -105,8 +105,7 @@ type astDot struct {
type astCmd struct {
Pos lexer.Position
Name astDot `parser:"@@"`
Assign *astDot `parser:"( EQ @@"`
InvokeArgs []astDot `parser:" | @@+ )?"`
InvokeArgs []astDot `parser:"@@*"`
}
type astPipeline struct {
@ -114,9 +113,15 @@ type astPipeline struct {
Rest []*astCmd `parser:"( PIPE @@ )*"`
}
type astAssignOrPipeline struct {
First *astCmd `parser:"@@"`
Assign *astPipeline `parser:"( EQ @@ "`
Pipeline []*astCmd `parser:"| ( PIPE @@ )+ )?"`
}
type astStatements struct {
First *astPipeline `parser:"@@"`
Rest []*astPipeline `parser:"( NL+ @@ )*"` // TODO: also add support for newlines
First *astAssignOrPipeline `parser:"@@"`
Rest []*astAssignOrPipeline `parser:"( NL+ @@ )*"` // TODO: also add support for newlines
}
type astScript struct {

49
ucl/eval.go
View file

@ -32,7 +32,7 @@ func (e evaluator) evalStatement(ctx context.Context, ec *evalCtx, n *astStateme
return nil, nil
}
res, err := e.evalPipeline(ctx, ec, n.First)
res, err := e.evalAssignOrPipeline(ctx, ec, n.First)
if err != nil {
return nil, err
}
@ -41,7 +41,7 @@ func (e evaluator) evalStatement(ctx context.Context, ec *evalCtx, n *astStateme
}
for _, rest := range n.Rest {
out, err := e.evalPipeline(ctx, ec, rest)
out, err := e.evalAssignOrPipeline(ctx, ec, rest)
if err != nil {
return nil, err
}
@ -50,6 +50,36 @@ func (e evaluator) evalStatement(ctx context.Context, ec *evalCtx, n *astStateme
return res, nil
}
func (e evaluator) evalAssignOrPipeline(ctx context.Context, ec *evalCtx, n *astAssignOrPipeline) (Object, error) {
switch {
case n.Assign != nil:
// Assignment
assignVal, err := e.evalPipeline(ctx, ec, n.Assign)
if err != nil {
return nil, err
}
return e.assignCmd(ctx, ec, n.First, assignVal)
case len(n.Pipeline) > 0:
res, err := e.evalCmd(ctx, ec, nil, n.First)
if err != nil {
return nil, err
}
for _, rest := range n.Pipeline {
out, err := e.evalCmd(ctx, ec, res, rest)
if err != nil {
return nil, err
}
res = out
}
return res, nil
}
return e.evalCmd(ctx, ec, nil, n.First)
}
func (e evaluator) evalPipeline(ctx context.Context, ec *evalCtx, n *astPipeline) (Object, error) {
res, err := e.evalCmd(ctx, ec, nil, n.First)
if err != nil {
@ -72,14 +102,6 @@ func (e evaluator) evalPipeline(ctx context.Context, ec *evalCtx, n *astPipeline
func (e evaluator) evalCmd(ctx context.Context, ec *evalCtx, currentPipe Object, ast *astCmd) (Object, error) {
switch {
case ast.Assign != nil:
// Assignment
assignVal, err := e.evalDot(ctx, ec, *ast.Assign)
if err != nil {
return nil, err
}
return e.assignDot(ctx, ec, ast.Name, assignVal)
case (ast.Name.Arg.Ident != nil) && len(ast.Name.DotSuffix) == 0:
name := ast.Name.Arg.Ident.String()
@ -114,6 +136,13 @@ func (e evaluator) evalCmd(ctx context.Context, ec *evalCtx, currentPipe Object,
return nameElem, nil
}
func (e evaluator) assignCmd(ctx context.Context, ec *evalCtx, ast *astCmd, toVal Object) (Object, error) {
if len(ast.InvokeArgs) != 0 {
return nil, errors.New("cannot assign to multiple values")
}
return e.assignDot(ctx, ec, ast.Name, toVal)
}
func (e evaluator) evalInvokable(ctx context.Context, ec *evalCtx, currentPipe Object, ast *astCmd, cmd invokable) (Object, error) {
var (
pargs ListObject