eq directive

parser.ts

@@ -6,12 +6,26 @@ export type TemplateVariable = {
   type: string
 }
 
-const IF_RE = /<@if\(context\.(.+?)\)>/g
+const IF_RE = /<@(?:if|elseif)\((.+?)\)>/g
 const VAR_RE = /<@var\(context\.(.+?)(?::(\w+))?\)>/g
+const EQ_RE = /^eq\(context\.(.+?),\s*"(.*)"\)$/
+const PATH_RE = /^context\.(.+)$/
+
+function extractCondition(expr: string, vars: TemplateVariable[]) {
+  const eqMatch = expr.match(EQ_RE)
+  if (eqMatch) {
+    vars.push({ path: eqMatch[1]!, type: "string" })
+    return
+  }
+  const pathMatch = expr.match(PATH_RE)
+  if (pathMatch) {
+    vars.push({ path: pathMatch[1]!, type: "boolean" })
+  }
+}
 
 function extractFromString(text: string, vars: TemplateVariable[]) {
   for (const match of text.matchAll(IF_RE)) {
-    vars.push({ path: match[1]!, type: "boolean" })
+    extractCondition(match[1]!, vars)
   }
   for (const match of text.matchAll(VAR_RE)) {
     vars.push({ path: match[1]!, type: match[2] ?? "string" })