Pipeline: City rename, add address/postal-code generation, add xeger generation (#232)

tooling/pipeline/src/services/postal_code/xeger_postal_code_service.cc

@@ -0,0 +1,44 @@
+/**
+ * @file services/postal_code/xeger_postal_code_service.cc
+ * @brief XegerPostalCodeService::GeneratePostalCode() implementation.
+ */
+
+#include "services/postal_code/xeger_postal_code_service.h"
+
+#include <format>
+#include <random>
+#include <stdexcept>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include "services/xeger/xeger.h"
+
+XegerPostalCodeService::XegerPostalCodeService()
+    : rng_(std::random_device{}()) {}
+
+std::string XegerPostalCodeService::GeneratePostalCode(const City& city) {
+  const PostalCodeSpec& spec = city.postal_code;
+
+  std::vector<std::string_view> city_patterns;
+  for (const std::string& pattern : spec.city_regexes) {
+    if (!pattern.empty()) {
+      city_patterns.push_back(pattern);
+    }
+  }
+
+  std::string_view pattern;
+  if (!city_patterns.empty()) {
+    std::uniform_int_distribution<size_t> dist(0, city_patterns.size() - 1);
+    pattern = city_patterns[dist(rng_)];
+  } else if (!spec.country_format_regex.empty()) {
+    pattern = spec.country_format_regex;
+  } else {
+    throw std::runtime_error(std::format(
+        "XegerPostalCodeService: no postal-code pattern available for "
+        "city '{}'",
+        city.city));
+  }
+
+  return GenerateStringFromRegex(pattern, rng_);
+}