51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package salix
|
|
|
|
import (
|
|
"io"
|
|
|
|
"go.elara.ws/salix/internal/ast"
|
|
)
|
|
|
|
// Tag represents a tag in a Salix template
|
|
type Tag interface {
|
|
Run(tc *TagContext, block, args []ast.Node) error
|
|
}
|
|
|
|
var globalTags = map[string]Tag{
|
|
"if": ifTag{},
|
|
"for": forTag{},
|
|
"include": includeTag{},
|
|
}
|
|
|
|
// TagContext is passed to Tag implementations to allow them to control the interpreter
|
|
type TagContext struct {
|
|
w io.Writer
|
|
t *Template
|
|
local map[string]any
|
|
}
|
|
|
|
// Execute runs the interpreter on the given AST nodes, with the given local variables.
|
|
func (tc *TagContext) Execute(nodes []ast.Node, local map[string]any) error {
|
|
return tc.t.execute(tc.w, nodes, mergeMap(tc.local, local))
|
|
}
|
|
|
|
// GetValue evaluates the given AST node using the given local variables.
|
|
func (tc *TagContext) GetValue(node ast.Node, local map[string]any) (any, error) {
|
|
return tc.t.getValue(node, mergeMap(tc.local, local))
|
|
}
|
|
|
|
func mergeMap(a, b map[string]any) map[string]any {
|
|
out := map[string]any{}
|
|
if a != nil {
|
|
for k, v := range a {
|
|
out[k] = v
|
|
}
|
|
}
|
|
if b != nil {
|
|
for k, v := range b {
|
|
out[k] = v
|
|
}
|
|
}
|
|
return out
|
|
}
|