headless: Implement client API generation

headless/lib/browser/types_h.template

Index: headless/lib/browser/types_h.template
diff --git a/headless/lib/browser/types_h.template b/headless/lib/browser/types_h.template
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+// This file is generated
+
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef HEADLESS_PUBLIC_DOMAINS_TYPES_H_
+#define HEADLESS_PUBLIC_DOMAINS_TYPES_H_
+
+#include "base/values.h"
+#include "headless/public/headless_export.h"
+#include "headless/public/util/error_reporter.h"
+#include "headless/public/util/maybe.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace headless {
+
+// ------------- Forward declarations and typedefs.
+
+{% for domain in api.domains %}
+
+namespace {{domain.domain | camelcase_to_hacker_style}} {
+  {% for type in domain.types %}
+    {% if type.type == "object" %}
+      {% if "properties" in type %}
+class {{type.id}};
+      {% else %}
+using {{type.id}} = base::Value;
+      {% endif %}
+    {% endif %}
+  {% endfor %}
+}  // namespace {{domain.domain}}
+{% endfor %}
+
+{% for domain in api.domains %}
+namespace {{domain.domain | camelcase_to_hacker_style}} {
+  {% for type in domain.types %}
+    {% if "enum" in type %}
+enum class {{type.id}} {
+      {% for literal in type.enum %}
+  {{ literal | dash_to_camelcase | camelcase_to_hacker_style | upper | mangle_enum}}{{',' if not loop.last}}
+      {% endfor %}
+};
+
+    {% endif %}
+  {% endfor %}
+}  // namespace {{domain.domain | camelcase_to_hacker_style}}
+
+{% endfor %}
+
+// ------------- Type and builder declarations.
+{% for domain in api.domains %}
+
+namespace {{domain.domain | camelcase_to_hacker_style}} {
+  {% for type in domain.types %}
+    {% if not (type.type == "object") or not ("properties" in type) %}{% continue %}{% endif %}
+
+    {% if type.description %}
+// {{type.description}}
+    {% endif %}
+class HEADLESS_EXPORT {{type.id}} {
+ public:
+  static {{resolve_type(type).pass_type}} Parse(const base::Value& value, ErrorReporter* errors);
+  ~{{type.id}}() { }
+    {% for property in type.properties %}
+
+    {% if property.description %}
+  // {{property.description}}
+    {% endif %}
+      {% if property.optional %}
+  bool Has{{property.name | to_title_case}}() { return {{property.name | camelcase_to_hacker_style}}_.IsJust(); }
+  {{resolve_type(property).raw_return_type}} Get{{property.name | to_title_case}}() { return {{resolve_type(property).to_raw_return_type % ("%s_.FromJust()" % property.name | camelcase_to_hacker_style)}}; }
+  void Set{{property.name | to_title_case}}({{resolve_type(property).pass_type}} value) { {{property.name | camelcase_to_hacker_style}}_ = Just({{resolve_type(property).to_pass_type % 'value'}}); }
+      {% else %}
+  {{resolve_type(property).raw_return_type}} Get{{property.name | to_title_case}}() { return {{resolve_type(property).to_raw_return_type % ("%s_" % property.name | camelcase_to_hacker_style)}}; }
+  void Set{{property.name | to_title_case}}({{resolve_type(property).pass_type}} value) { {{property.name | camelcase_to_hacker_style}}_ = {{resolve_type(property).to_pass_type % 'value'}}; }
+      {% endif %}
+    {% endfor %}
+
+  std::unique_ptr<base::Value> Serialize() const;
+  {{resolve_type(type).pass_type}} Clone() const;
+
+  template<int STATE>
+  class {{type.id}}Builder {
+  public:
+    enum {
+      kNoFieldsSet = 0,
+    {% set count = 0 %}
+    {% for property in type.properties %}
+      {% if not(property.optional) %}
+        {% set count = count + 1 %}
+      k{{property.name | to_title_case}}Set = 1 << {{count}},
+      {% endif %}
+    {% endfor %}
+      kAllRequiredFieldsSet = (
+    {%- for property in type.properties %}
+      {% if not(property.optional) %}k{{property.name | to_title_case}}Set | {%endif %}
+    {% endfor %}0)
+    };
+
+    {% for property in type.properties %}
+      {% if property.optional %}
+    {{type.id}}Builder<STATE>& Set{{property.name | to_title_case}}({{resolve_type(property).pass_type}} value) {
+      result_->Set{{property.name | to_title_case}}({{resolve_type(property).to_pass_type % 'value'}});
+      return *this;
+    }
+      {% else %}
+    {{type.id}}Builder<STATE | k{{property.name | to_title_case}}Set>& Set{{property.name | to_title_case}}({{resolve_type(property).pass_type}} value) {
+      static_assert(!(STATE & k{{property.name | to_title_case}}Set), "property {{property.name}} should not have already been set");
+      result_->Set{{property.name | to_title_case}}({{resolve_type(property).to_pass_type % 'value'}});
+      return CastState<k{{property.name | to_title_case}}Set>();
+    }
+      {% endif %}
+
+    {% endfor %}
+    {{resolve_type(type).pass_type}} Build() {
+      static_assert(STATE == kAllRequiredFieldsSet, "all required fields should have been set");
+      return std::move(result_);
+    }
+
+   private:
+    friend class {{type.id}};
+    {{type.id}}Builder() : result_(new {{type.id}}()) { }
+
+    template<int STEP> {{type.id}}Builder<STATE | STEP>& CastState() {
+      return *reinterpret_cast<{{type.id}}Builder<STATE | STEP>*>(this);
+    }
+
+    {{resolve_type(type).type}} result_;
+  };
+
+  static {{type.id}}Builder<0> Builder() {
+    return {{type.id}}Builder<0>();
+  }
+
+ private:
+  {{type.id}}() { }
+
+    {% for property in type.properties %}
+      {% if property.optional %}
+  Maybe<{{resolve_type(property).type}}> {{property.name | camelcase_to_hacker_style}}_;
+      {% else %}
+  {{resolve_type(property).type}} {{property.name | camelcase_to_hacker_style}}_;
+      {% endif %}
+    {% endfor %}
+
+  DISALLOW_COPY_AND_ASSIGN({{type.id}});
+};
+
+  {% endfor %}
+
+}  // namespace {{domain.domain | camelcase_to_hacker_style}}
+{% endfor %}
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_DOMAINS_TYPES_H_