109 lines
2.4 KiB
Go
109 lines
2.4 KiB
Go
package salix
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import (
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"errors"
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"reflect"
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"go.elara.ws/salix/ast"
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)
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// forTag represents a #for tag within a Salix template
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type forTag struct{}
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func (ft forTag) Run(tc *TagContext, block, args []ast.Node) error {
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if len(args) == 0 || len(args) > 3 {
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return tc.PosError(tc.Tag, "invalid argument amount")
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}
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expr, ok := args[len(args)-1].(ast.Expr)
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if !ok {
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return tc.PosError(args[0], "invalid argument type: %T (expected ast.Expr)", args[0])
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}
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var vars []string
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var in reflect.Value
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if len(args) > 1 {
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for _, arg := range args[:len(args)-1] {
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varName, ok := unwrap(arg).(ast.Ident)
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if !ok {
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return tc.PosError(arg, "invalid argument type: %T (expected ast.Ident)", expr.First)
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}
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vars = append(vars, varName.Value)
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}
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}
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varName, ok := unwrap(expr.First).(ast.Ident)
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if !ok {
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return tc.PosError(expr.First, "invalid argument type: %T (expected ast.Ident)", args[0])
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}
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vars = append(vars, varName.Value)
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if len(expr.Rest) != 1 {
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return tc.PosError(expr.First, "invalid expression (expected 1 element, got %d)", len(expr.Rest))
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}
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rest := expr.Rest[0]
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if rest.Operator.Value != "in" {
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return tc.PosError(expr.First, `invalid operator in expression (expected "in", got %q)`, rest.Operator.Value)
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}
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val, err := tc.GetValue(rest, nil)
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if err != nil {
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return err
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}
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in = reflect.ValueOf(val)
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switch in.Kind() {
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case reflect.Slice, reflect.Array:
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local := map[string]any{}
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for i := 0; i < in.Len(); i++ {
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if len(vars) == 1 {
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local[vars[0]] = in.Index(i).Interface()
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} else if len(vars) == 2 {
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local[vars[0]] = i
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local[vars[1]] = in.Index(i).Interface()
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} else {
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return errors.New("slices and arrays can only use two for loop variables")
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}
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err = tc.Execute(block, local)
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if err != nil {
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return err
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}
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}
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case reflect.Map:
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local := map[string]any{}
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iter := in.MapRange()
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i := 0
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for iter.Next() {
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if len(vars) == 1 {
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local[vars[0]] = iter.Value().Interface()
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} else if len(vars) == 2 {
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local[vars[0]] = iter.Key().Interface()
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local[vars[1]] = iter.Value().Interface()
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} else if len(vars) == 3 {
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local[vars[0]] = i
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local[vars[1]] = iter.Key().Interface()
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local[vars[2]] = iter.Value().Interface()
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}
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err = tc.Execute(block, local)
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if err != nil {
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return err
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}
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i++
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}
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}
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return nil
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}
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func unwrap(n ast.Node) ast.Node {
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if v, ok := n.(ast.Value); ok {
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return v.Node
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}
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return n
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}
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