fix: regression in attrib + test

Signed-off-by: Tuan Anh Tran <me@tuananh.org>

Author: tuananh

dist/camaro.wasm

@@ -126,6 +126,13 @@ static pugi::xml_node follow_path(pugi::xml_node ctx, const char *path,
 
 static string follow_path_string(pugi::xml_node ctx, const string &path,
                                  bool absolute) {
+  // Bare @attr selects an attribute on the context node.
+  if (!path.empty() && path[0] == '@') {
+    if (!ctx)
+      return "";
+    pugi::xml_attribute a = ctx.attribute(path.c_str() + 1);
+    return a ? string(a.value()) : "";
+  }
   const size_t at_pos = path.rfind("/@");
   if (at_pos != string::npos) {
     const string elem = path.substr(0, at_pos);
@@ -142,6 +149,13 @@ static string follow_path_string(pugi::xml_node ctx, const string &path,
 
 static double follow_path_number(pugi::xml_node ctx, const string &path,
                                  bool absolute) {
+  // Bare @attr selects an attribute on the context node.
+  if (!path.empty() && path[0] == '@') {
+    if (!ctx)
+      return std::nan("");
+    pugi::xml_attribute a = ctx.attribute(path.c_str() + 1);
+    return a ? a.as_double() : std::nan("");
+  }
   const size_t at_pos = path.rfind("/@");
   if (at_pos != string::npos) {
     const string elem = path.substr(0, at_pos);

src/camaro.cpp

@@ -0,0 +1,38 @@
+const t = require('tape')
+const { transform } = require('../')
+
+t.test('bare @attr on context node (README example)', async (t) => {
+    const xml = `
+        <players>
+            <player jerseyNumber="10">
+                <name>wayne rooney</name>
+                <isRetired>false</isRetired>
+                <yearOfBirth>1985</yearOfBirth>
+            </player>
+            <player jerseyNumber="7">
+                <name>cristiano ronaldo</name>
+                <isRetired>false</isRetired>
+                <yearOfBirth>1985</yearOfBirth>
+            </player>
+        </players>
+    `
+    const template = ['players/player', {
+        name: 'title-case(name)',
+        jerseyNumber: '@jerseyNumber',
+        yearOfBirth: 'number(yearOfBirth)',
+        jerseyAsNumber: 'number(@jerseyNumber)',
+        isRetired: 'boolean(isRetired = "true")'
+    }]
+
+    const result = await transform(xml, template)
+    t.equal(result.length, 2)
+    t.equal(result[0].jerseyNumber, '10')
+    t.equal(result[0].jerseyAsNumber, 10)
+    t.equal(result[0].name, 'Wayne Rooney')
+    t.equal(result[0].yearOfBirth, 1985)
+    t.equal(result[0].isRetired, false)
+    t.equal(result[1].jerseyNumber, '7')
+    t.equal(result[1].jerseyAsNumber, 7)
+    t.equal(result[1].isRetired, false)
+    t.end()
+})