84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
#include <optional>
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#include <unordered_map>
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#include <span>
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#include <string>
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#include <string_view>
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#include <tuple>
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#include <variant>
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#include <vector>
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namespace Lml
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{
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///
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/// Tree leaf composed of zero or more values.
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///
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using Scalar = std::vector<std::string>;
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///
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/// Content body capable of holding Scalars as properties and other child Documents as elements.
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///
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struct Document final
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{
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///
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/// Custom hashing mechanism used by properties to support lookups with string types other than std::string.
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///
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struct PropertyHash
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{
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using HashType = std::hash<std::string_view>;
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using is_transparent = void;
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size_t operator()(const char* str) const
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{
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return HashType{}(str);
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}
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size_t operator()(std::string_view str) const
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{
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return HashType{}(str);
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}
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size_t operator()(std::string const& str) const
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{
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return HashType{}(str);
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}
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};
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///
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/// Map of property names and their associated Scalar.
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///
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using PropertyMap = std::unordered_map<std::string, Scalar, PropertyHash, std::equal_to<>>;
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///
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/// List of associated element names and Documents.
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///
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using ElementList = std::vector<std::tuple<std::string, Document>>;
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///
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/// All live property Scalars belonging to the Document.
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///
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PropertyMap properties {};
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///
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/// All live element Documents belonging to the Document.
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///
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ElementList elements {};
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///
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/// Attempts to parse the provided data into the live Document object model, returning true if it was
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/// successful, otherwise false.
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///
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bool Parse(std::string_view const & data);
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///
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/// Attempts to retrieve a single string value from a Scalar defined under the provided property name,
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/// returning it or null if no such property exists.
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///
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std::optional<std::string> Property(std::string_view const & property);
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///
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/// Serializes the live Document object model to the provided string with the specified indentation level.
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///
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void SerializeTo(std::string & string, size_t indentation) const;
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};
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} |