48 lines
945 B
Go
48 lines
945 B
Go
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package cmdlang
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import (
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"context"
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"errors"
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"github.com/lmika/gopkgs/fp/slices"
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"strconv"
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)
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type evaluator struct {
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}
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func (e evaluator) evaluate(ctx context.Context, ec *evalCtx, ast *astCmd) error {
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cmd, err := ec.lookupCmd(ast.Name)
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if err != nil {
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return err
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}
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args, err := slices.MapWithError(ast.Args, func(a astCmdArg) (string, error) {
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return e.evalArg(ctx, ec, a)
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})
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if err != nil {
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return err
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}
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return cmd.invoke(ctx, invocationArgs{
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args: args,
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})
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}
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func (e evaluator) evalArg(ctx context.Context, ec *evalCtx, n astCmdArg) (string, error) {
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return e.evalLiteral(ctx, ec, n.Literal)
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}
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func (e evaluator) evalLiteral(ctx context.Context, ec *evalCtx, n astLiteral) (string, error) {
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switch {
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case n.Str != nil:
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uq, err := strconv.Unquote(*n.Str)
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if err != nil {
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return "", err
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}
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return uq, nil
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case n.Ident != nil:
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return *n.Ident, nil
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}
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return "", errors.New("unhandled literal type")
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}
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