61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
package salix
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import (
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"errors"
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"go.elara.ws/salix/ast"
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)
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var (
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ErrMacroInvalidArgs = errors.New("macro expects one string argument followed by variable assignments")
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ErrNoSuchMacro = errors.New("no such template")
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)
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// macroTag represents an #macro tag within a Salix template
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type macroTag struct{}
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func (mt macroTag) Run(tc *TagContext, block, args []ast.Node) error {
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if len(args) < 1 {
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return ErrMacroInvalidArgs
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}
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nameVal, err := tc.GetValue(args[0], nil)
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if err != nil {
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return err
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}
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name, ok := nameVal.(string)
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if !ok {
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return ErrMacroInvalidArgs
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}
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if len(block) == 0 {
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local := map[string]any{}
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// Use the variable assignments after the first argument
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// to set the local variables of the execution
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for _, arg := range args[1:] {
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if a, ok := arg.(ast.Assignment); ok {
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val, err := tc.GetValue(a.Value, local)
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if err != nil {
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return err
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}
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local[a.Name.Value] = val
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} else {
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// If the argument isn't an assigment, return invalid args
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return ErrMacroInvalidArgs
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}
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}
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macro, ok := tc.t.macros[name]
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if !ok {
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return ErrNoSuchMacro
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}
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return tc.Execute(macro, local)
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} else {
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tc.t.macros[name] = block
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}
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return nil
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}
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