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Diffstat (limited to 'include/inja/renderer.hpp')
| -rw-r--r-- | include/inja/renderer.hpp | 611 |
1 files changed, 611 insertions, 0 deletions
diff --git a/include/inja/renderer.hpp b/include/inja/renderer.hpp new file mode 100644 index 0000000..7bc518f --- /dev/null +++ b/include/inja/renderer.hpp @@ -0,0 +1,611 @@ +// Copyright (c) 2020 Pantor. All rights reserved. + +#ifndef INCLUDE_INJA_RENDERER_HPP_ +#define INCLUDE_INJA_RENDERER_HPP_ + +#include <algorithm> +#include <numeric> +#include <string> +#include <utility> +#include <vector> + +#include <nlohmann/json.hpp> + +#include "config.hpp" +#include "exceptions.hpp" +#include "node.hpp" +#include "template.hpp" +#include "utils.hpp" + +namespace inja { + +/*! + * \brief Class for rendering a Template with data. + */ +class Renderer : public NodeVisitor { + using Op = FunctionStorage::Operation; + + const RenderConfig config; + const Template *current_template; + const TemplateStorage &template_storage; + const FunctionStorage &function_storage; + + const json *json_input; + std::ostream *output_stream; + + json json_additional_data; + json* current_loop_data = &json_additional_data["loop"]; + + std::vector<std::shared_ptr<json>> json_tmp_stack; + std::stack<const json*> json_eval_stack; + std::stack<const JsonNode*> not_found_stack; + + bool truthy(const json* data) const { + if (data->is_boolean()) { + return data->get<bool>(); + } else if (data->is_number()) { + return (*data != 0); + } else if (data->is_null()) { + return false; + } + return !data->empty(); + } + + void print_json(const std::shared_ptr<json> value) { + if (value->is_string()) { + *output_stream << value->get_ref<const json::string_t&>(); + } else if (value->is_number_integer()) { + *output_stream << value->get<const json::number_integer_t>(); + } else if (value->is_null()) { + } else { + *output_stream << value->dump(); + } + } + + const std::shared_ptr<json> eval_expression_list(const ExpressionListNode& expression_list) { + for (auto& expression : expression_list.rpn_output) { + expression->accept(*this); + } + + if (json_eval_stack.empty()) { + throw_renderer_error("empty expression", expression_list); + } else if (json_eval_stack.size() != 1) { + throw_renderer_error("malformed expression", expression_list); + } + + auto result = json_eval_stack.top(); + json_eval_stack.pop(); + + if (!result) { + if (not_found_stack.empty()) { + throw_renderer_error("expression could not be evaluated", expression_list); + } + + auto node = not_found_stack.top(); + not_found_stack.pop(); + + throw_renderer_error("variable '" + static_cast<std::string>(node->name) + "' not found", *node); + } + return std::make_shared<json>(*result); + } + + void throw_renderer_error(const std::string &message, const AstNode& node) { + SourceLocation loc = get_source_location(current_template->content, node.pos); + INJA_THROW(RenderError(message, loc)); + } + + template<size_t N, bool throw_not_found=true> + std::array<const json*, N> get_arguments(const AstNode& node) { + if (json_eval_stack.size() < N) { + throw_renderer_error("function needs " + std::to_string(N) + " variables, but has only found " + std::to_string(json_eval_stack.size()), node); + } + + std::array<const json*, N> result; + for (size_t i = 0; i < N; i += 1) { + result[N - i - 1] = json_eval_stack.top(); + json_eval_stack.pop(); + + if (!result[N - i - 1]) { + auto json_node = not_found_stack.top(); + not_found_stack.pop(); + + if (throw_not_found) { + throw_renderer_error("variable '" + static_cast<std::string>(json_node->name) + "' not found", *json_node); + } + } + } + return result; + } + + template<bool throw_not_found=true> + Arguments get_argument_vector(size_t N, const AstNode& node) { + if (json_eval_stack.size() < N) { + throw_renderer_error("function needs " + std::to_string(N) + " variables, but has only found " + std::to_string(json_eval_stack.size()), node); + } + + Arguments result {N}; + for (size_t i = 0; i < N; i += 1) { + result[N - i - 1] = json_eval_stack.top(); + json_eval_stack.pop(); + + if (!result[N - i - 1]) { + auto json_node = not_found_stack.top(); + not_found_stack.pop(); + + if (throw_not_found) { + throw_renderer_error("variable '" + static_cast<std::string>(json_node->name) + "' not found", *json_node); + } + } + } + return result; + } + + void visit(const BlockNode& node) { + for (auto& n : node.nodes) { + n->accept(*this); + } + } + + void visit(const TextNode& node) { + output_stream->write(current_template->content.c_str() + node.pos, node.length); + } + + void visit(const ExpressionNode&) { } + + void visit(const LiteralNode& node) { + json_eval_stack.push(&node.value); + } + + void visit(const JsonNode& node) { + if (json_additional_data.contains(node.ptr)) { + json_eval_stack.push(&(json_additional_data[node.ptr])); + + } else if (json_input->contains(node.ptr)) { + json_eval_stack.push(&(*json_input)[node.ptr]); + + } else { + // Try to evaluate as a no-argument callback + auto function_data = function_storage.find_function(node.name, 0); + if (function_data.operation == FunctionStorage::Operation::Callback) { + Arguments empty_args {}; + auto value = std::make_shared<json>(function_data.callback(empty_args)); + json_tmp_stack.push_back(value); + json_eval_stack.push(value.get()); + + } else { + json_eval_stack.push(nullptr); + not_found_stack.emplace(&node); + } + } + } + + void visit(const FunctionNode& node) { + std::shared_ptr<json> result_ptr; + + switch (node.operation) { + case Op::Not: { + auto args = get_arguments<1>(node); + result_ptr = std::make_shared<json>(!truthy(args[0])); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::And: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(truthy(args[0]) && truthy(args[1])); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Or: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(truthy(args[0]) || truthy(args[1])); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::In: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(std::find(args[1]->begin(), args[1]->end(), *args[0]) != args[1]->end()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Equal: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] == *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::NotEqual: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] != *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Greater: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] > *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::GreaterEqual: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] >= *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Less: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] < *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::LessEqual: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(*args[0] <= *args[1]); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Add: { + auto args = get_arguments<2>(node); + if (args[0]->is_string() && args[1]->is_string()) { + result_ptr = std::make_shared<json>(args[0]->get_ref<const std::string&>() + args[1]->get_ref<const std::string&>()); + json_tmp_stack.push_back(result_ptr); + } else if (args[0]->is_number_integer() && args[1]->is_number_integer()) { + result_ptr = std::make_shared<json>(args[0]->get<int>() + args[1]->get<int>()); + json_tmp_stack.push_back(result_ptr); + } else { + result_ptr = std::make_shared<json>(args[0]->get<double>() + args[1]->get<double>()); + json_tmp_stack.push_back(result_ptr); + } + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Subtract: { + auto args = get_arguments<2>(node); + if (args[0]->is_number_integer() && args[1]->is_number_integer()) { + result_ptr = std::make_shared<json>(args[0]->get<int>() - args[1]->get<int>()); + json_tmp_stack.push_back(result_ptr); + } else { + result_ptr = std::make_shared<json>(args[0]->get<double>() - args[1]->get<double>()); + json_tmp_stack.push_back(result_ptr); + } + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Multiplication: { + auto args = get_arguments<2>(node); + if (args[0]->is_number_integer() && args[1]->is_number_integer()) { + result_ptr = std::make_shared<json>(args[0]->get<int>() * args[1]->get<int>()); + json_tmp_stack.push_back(result_ptr); + } else { + result_ptr = std::make_shared<json>(args[0]->get<double>() * args[1]->get<double>()); + json_tmp_stack.push_back(result_ptr); + } + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Division: { + auto args = get_arguments<2>(node); + if (args[1]->get<double>() == 0) { + throw_renderer_error("division by zero", node); + } + result_ptr = std::make_shared<json>(args[0]->get<double>() / args[1]->get<double>()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Power: { + auto args = get_arguments<2>(node); + if (args[0]->is_number_integer() && args[1]->get<int>() >= 0) { + int result = std::pow(args[0]->get<int>(), args[1]->get<int>()); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + } else { + double result = std::pow(args[0]->get<double>(), args[1]->get<int>()); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + } + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Modulo: { + auto args = get_arguments<2>(node); + result_ptr = std::make_shared<json>(args[0]->get<int>() % args[1]->get<int>()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::AtId: { + json_eval_stack.pop(); // Pop id nullptr + auto container = get_arguments<1, false>(node)[0]; + if (not_found_stack.empty()) { + throw_renderer_error("could not find element with given name", node); + } + auto id_node = not_found_stack.top(); + not_found_stack.pop(); + json_eval_stack.push(&container->at(id_node->name)); + } break; + case Op::At: { + auto args = get_arguments<2>(node); + json_eval_stack.push(&args[0]->at(args[1]->get<int>())); + } break; + case Op::Default: { + auto default_arg = get_arguments<1>(node)[0]; + auto test_arg = get_arguments<1, false>(node)[0]; + json_eval_stack.push(test_arg ? test_arg : default_arg); + } break; + case Op::DivisibleBy: { + auto args = get_arguments<2>(node); + int divisor = args[1]->get<int>(); + result_ptr = std::make_shared<json>((divisor != 0) && (args[0]->get<int>() % divisor == 0)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Even: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->get<int>() % 2 == 0); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Exists: { + auto &&name = get_arguments<1>(node)[0]->get_ref<const std::string &>(); + result_ptr = std::make_shared<json>(json_input->contains(json::json_pointer(JsonNode::convert_dot_to_json_ptr(name)))); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::ExistsInObject: { + auto args = get_arguments<2>(node); + auto &&name = args[1]->get_ref<const std::string &>(); + result_ptr = std::make_shared<json>(args[0]->find(name) != args[0]->end()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::First: { + auto result = &get_arguments<1>(node)[0]->front(); + json_eval_stack.push(result); + } break; + case Op::Float: { + result_ptr = std::make_shared<json>(std::stod(get_arguments<1>(node)[0]->get_ref<const std::string &>())); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Int: { + result_ptr = std::make_shared<json>(std::stoi(get_arguments<1>(node)[0]->get_ref<const std::string &>())); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Last: { + auto result = &get_arguments<1>(node)[0]->back(); + json_eval_stack.push(result); + } break; + case Op::Length: { + auto val = get_arguments<1>(node)[0]; + if (val->is_string()) { + result_ptr = std::make_shared<json>(val->get_ref<const std::string &>().length()); + } else { + result_ptr = std::make_shared<json>(val->size()); + } + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Lower: { + std::string result = get_arguments<1>(node)[0]->get<std::string>(); + std::transform(result.begin(), result.end(), result.begin(), ::tolower); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Max: { + auto args = get_arguments<1>(node); + auto result = std::max_element(args[0]->begin(), args[0]->end()); + json_eval_stack.push(&(*result)); + } break; + case Op::Min: { + auto args = get_arguments<1>(node); + auto result = std::min_element(args[0]->begin(), args[0]->end()); + json_eval_stack.push(&(*result)); + } break; + case Op::Odd: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->get<int>() % 2 != 0); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Range: { + std::vector<int> result(get_arguments<1>(node)[0]->get<int>()); + std::iota(result.begin(), result.end(), 0); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Round: { + auto args = get_arguments<2>(node); + int precision = args[1]->get<int>(); + double result = std::round(args[0]->get<double>() * std::pow(10.0, precision)) / std::pow(10.0, precision); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Sort: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->get<std::vector<json>>()); + std::sort(result_ptr->begin(), result_ptr->end()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Upper: { + std::string result = get_arguments<1>(node)[0]->get<std::string>(); + std::transform(result.begin(), result.end(), result.begin(), ::toupper); + result_ptr = std::make_shared<json>(std::move(result)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsBoolean: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_boolean()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsNumber: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_number()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsInteger: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_number_integer()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsFloat: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_number_float()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsObject: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_object()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsArray: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_array()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::IsString: { + result_ptr = std::make_shared<json>(get_arguments<1>(node)[0]->is_string()); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::Callback: { + auto args = get_argument_vector(node.number_args, node); + result_ptr = std::make_shared<json>(node.callback(args)); + json_tmp_stack.push_back(result_ptr); + json_eval_stack.push(result_ptr.get()); + } break; + case Op::ParenLeft: + case Op::ParenRight: + case Op::None: + break; + } + } + + void visit(const ExpressionListNode& node) { + print_json(eval_expression_list(node)); + } + + void visit(const StatementNode&) { } + + void visit(const ForStatementNode&) { } + + void visit(const ForArrayStatementNode& node) { + auto result = eval_expression_list(node.condition); + if (!result->is_array()) { + throw_renderer_error("object must be an array", node); + } + + if (!current_loop_data->empty()) { + auto tmp = *current_loop_data; // Because of clang-3 + (*current_loop_data)["parent"] = std::move(tmp); + } + + size_t index = 0; + (*current_loop_data)["is_first"] = true; + (*current_loop_data)["is_last"] = (result->size() <= 1); + for (auto it = result->begin(); it != result->end(); ++it) { + json_additional_data[static_cast<std::string>(node.value)] = *it; + + (*current_loop_data)["index"] = index; + (*current_loop_data)["index1"] = index + 1; + if (index == 1) { + (*current_loop_data)["is_first"] = false; + } + if (index == result->size() - 1) { + (*current_loop_data)["is_last"] = true; + } + + node.body.accept(*this); + ++index; + } + + json_additional_data[static_cast<std::string>(node.value)].clear(); + if (!(*current_loop_data)["parent"].empty()) { + auto tmp = (*current_loop_data)["parent"]; + *current_loop_data = std::move(tmp); + } else { + current_loop_data = &json_additional_data["loop"]; + } + } + + void visit(const ForObjectStatementNode& node) { + auto result = eval_expression_list(node.condition); + if (!result->is_object()) { + throw_renderer_error("object must be an object", node); + } + + if (!current_loop_data->empty()) { + (*current_loop_data)["parent"] = std::move(*current_loop_data); + } + + size_t index = 0; + (*current_loop_data)["is_first"] = true; + (*current_loop_data)["is_last"] = (result->size() <= 1); + for (auto it = result->begin(); it != result->end(); ++it) { + json_additional_data[static_cast<std::string>(node.key)] = it.key(); + json_additional_data[static_cast<std::string>(node.value)] = it.value(); + + (*current_loop_data)["index"] = index; + (*current_loop_data)["index1"] = index + 1; + if (index == 1) { + (*current_loop_data)["is_first"] = false; + } + if (index == result->size() - 1) { + (*current_loop_data)["is_last"] = true; + } + + node.body.accept(*this); + ++index; + } + + json_additional_data[static_cast<std::string>(node.key)].clear(); + json_additional_data[static_cast<std::string>(node.value)].clear(); + if (!(*current_loop_data)["parent"].empty()) { + *current_loop_data = std::move((*current_loop_data)["parent"]); + } else { + current_loop_data = &json_additional_data["loop"]; + } + } + + void visit(const IfStatementNode& node) { + auto result = eval_expression_list(node.condition); + if (truthy(result.get())) { + node.true_statement.accept(*this); + } else if (node.has_false_statement) { + node.false_statement.accept(*this); + } + } + + void visit(const IncludeStatementNode& node) { + auto sub_renderer = Renderer(config, template_storage, function_storage); + auto included_template_it = template_storage.find(node.file); + + if (included_template_it != template_storage.end()) { + sub_renderer.render_to(*output_stream, included_template_it->second, *json_input, &json_additional_data); + } else if (config.throw_at_missing_includes) { + throw_renderer_error("include '" + node.file + "' not found", node); + } + } + + void visit(const SetStatementNode& node) { + json_additional_data[node.key] = *eval_expression_list(node.expression); + } + +public: + Renderer(const RenderConfig& config, const TemplateStorage &template_storage, const FunctionStorage &function_storage) + : config(config), template_storage(template_storage), function_storage(function_storage) { } + + void render_to(std::ostream &os, const Template &tmpl, const json &data, json *loop_data = nullptr) { + output_stream = &os; + current_template = &tmpl; + json_input = &data; + if (loop_data) { + json_additional_data = *loop_data; + current_loop_data = &json_additional_data["loop"]; + } + + current_template->root.accept(*this); + + json_tmp_stack.clear(); + } +}; + +} // namespace inja + +#endif // INCLUDE_INJA_RENDERER_HPP_ |