added Type::read methods

2 files changed, 76 insertions, 0 deletions

diff --git a/src/core/model/Typesystem.cpp b/src/core/model/Typesystem.cpp
index fb99f87..dad2ec3 100644
--- a/src/core/model/Typesystem.cpp
+++ b/src/core/model/Typesystem.cpp
@@ -21,6 +21,7 @@
 #include <core/common/RttiBuilder.hpp>
 #include <core/common/Utils.hpp>
 #include <core/common/VariantConverter.hpp>
+#include <core/common/VariantReader.hpp>
 
 namespace ousia {
 
@@ -67,6 +68,54 @@ bool Type::build(Variant &data, Logger &logger) const
 	return build(data, logger, NullMagicCallback);
 }
 
+std::pair<bool, Variant> Type::read(CharReader &reader, Logger &logger,
+                                    const std::unordered_set<char> &delims)
+{
+	// try all variant types of this type and use the first successful one.
+	Variant v;
+	bool success = false;
+	for (auto t : getVariantTypes()) {
+		auto res = VariantReader::parseTyped(t, reader, logger, delims);
+		if (res.first) {
+			v = res.second;
+			success = true;
+			break;
+		}
+	}
+
+	if (!success) {
+		return std::make_pair(false, Variant{});
+	}
+	if (!build(v, logger)) {
+		return std::make_pair(false, Variant{});
+	}
+	return std::make_pair(true, v);
+}
+
+std::pair<bool, Variant> Type::read(const std::string &str, Logger &logger,
+                                    SourceId sourceId, size_t offs)
+{
+	// try all variant types of this type and use the first successful one.
+	Variant v;
+	bool success = false;
+	for (auto t : getVariantTypes()) {
+		auto res = VariantReader::parseTyped(t, str, logger, sourceId, offs);
+		if (res.first) {
+			v = res.second;
+			success = true;
+			break;
+		}
+	}
+
+	if (!success) {
+		return std::make_pair(false, Variant{});
+	}
+	if (!build(v, logger)) {
+		return std::make_pair(false, Variant{});
+	}
+	return std::make_pair(true, v);
+}
+
 bool Type::doCheckIsa(Handle<const Type> type) const { return false; }
 
 bool Type::checkIsa(Handle<const Type> type) const
diff --git a/src/core/model/Typesystem.hpp b/src/core/model/Typesystem.hpp
index c0a073a..d58a98f 100644
--- a/src/core/model/Typesystem.hpp
+++ b/src/core/model/Typesystem.hpp
@@ -43,6 +43,7 @@
 namespace ousia {
 
 // Forward declarations
+class CharReader;
 class Rtti;
 class Typesystem;
 class SystemTypesystem;
@@ -168,6 +169,32 @@ public:
 	bool build(Variant &data, Logger &logger) const;
 
 	/**
+	 * Tries to parse an instance of this type from the given stream.
+	 *
+	 * @param reader is a reference to the CharReader instance which is
+	 * the source for the character data. The reader will be positioned
+	 * at the end of the type instance (or the delimiting character).
+	 * @param delims is a set of characters which will terminate the typed
+	 * instance if the according parser uses delimiting characters.
+	 * These characters are not included in the result. May not be nullptr.
+	 */
+	std::pair<bool, Variant> read(CharReader &reader, Logger &logger,
+	                              const std::unordered_set<char> &delims = {});
+
+	/**
+	 * Tries to parse an instance of this type from the given string.
+	 *
+	 * @param str is the string from which the value should be read.
+	 * @param sourceId is an optional descriptor of the source file from which
+	 * the element is being read.
+	 * @param offs is the by offset in the source file at which the string
+	 * starts.
+	 */
+	std::pair<bool, Variant> read(const std::string &str, Logger &logger,
+	                              SourceId sourceId = InvalidSourceId,
+	                              size_t offs = 0);
+
+	/**
 	 * Returns true if and only if the given Variant adheres to this Type. In
 	 * essence this just calls the build method on a copy of the input Variant.
 	 *