2 files changed, 54 insertions, 0 deletions
diff --git a/src/core/parser/stack/TokenStack.cpp b/src/core/parser/stack/TokenStack.cpp
index c20c764..1c26a7c 100644
--- a/src/core/parser/stack/TokenStack.cpp
+++ b/src/core/parser/stack/TokenStack.cpp
@@ -30,6 +30,24 @@ void TokenStack::pushTokens(const std::vector<SyntaxDescriptor> &tokens,
 	stack.push_back(tokens);
 }
 
+TokenDescriptor TokenStack::lookup(TokenId token) const
+{
+	TokenDescriptor res;
+	if (!stack.empty()) {
+		for (const SyntaxDescriptor &descr : stack.back()) {
+			if (descr.close == token) {
+				res.close.emplace_back(descr);
+			}
+			if (descr.shortForm == token) {
+				res.shortForm.emplace_back(descr);
+			}
+			if (descr.open == token) {
+				res.open.emplace_back(descr);
+			}
+		}
+	}
+	return res;
+}
 void TokenStack::popTokens() { stack.pop_back(); }
 
 TokenSet TokenStack::tokens() const
diff --git a/src/core/parser/stack/TokenStack.hpp b/src/core/parser/stack/TokenStack.hpp
index 32f181a..d5deafe 100644
--- a/src/core/parser/stack/TokenStack.hpp
+++ b/src/core/parser/stack/TokenStack.hpp
@@ -38,6 +38,34 @@ namespace ousia {
 namespace parser_stack {
 
 /**
+ * Structure describing a token once it has been found in the text. Contains
+ * lists pointing at the corresponding SyntaxDescriptors for the open, close and
+ * shortForm token types.
+ */
+struct TokenDescriptor {
+	/**
+	 * Vector containing the SyntaxDescriptors in which the token occurs as
+	 * "close" token. The Token is first tried to be processed as a "close"
+	 * token.
+	 */
+	std::vector<SyntaxDescriptor> close;
+
+	/**
+	 * Vector containing the SyntaxDescriptors in which the token occurs as
+	 * "shortForm" token. Creating a "shortForm" of the referenced ontology
+	 * descriptor is tried next.
+	 */
+	std::vector<SyntaxDescriptor> shortForm;
+
+	/**
+	 * Vector containing the SyntaxDescriptors in which the token occurs as
+	 * "open" token. The possibility of using the token in the "open" mode is
+	 * tried in the last step.
+	 */
+	std::vector<SyntaxDescriptor> open;
+};
+
+/**
  * The TokenStack class is used by the Stack class to collect all currently
  * enabled user defined tokens.
  */
@@ -66,6 +94,14 @@ public:
 	void popTokens();
 
 	/**
+	 * Returns the TokenDescriptor for the given token.
+	 *
+	 * @param token is the token for which the different forms should be looked
+	 * up.
+	 */
+	TokenDescriptor lookup(TokenId token) const;
+
+	/**
 	 * Returns a set containing all currently enabled tokens. The set of enabled
 	 * tokens are those tokens that were pushed last onto the stack. This set
 	 * has to be passed to the TokenizedData instance in order to gather all