From 5aed7c46cff192311a208dc5e9cf7f81a40771a8 Mon Sep 17 00:00:00 2001
From: Andreas Stöckel <astoecke@techfak.uni-bielefeld.de>
Date: Tue, 31 Mar 2015 23:49:44 +0200
Subject: Implement TokenStack::lookup method used to lookup the
 SyntaxDescriptors associated with a certain token.

---
 src/core/parser/stack/TokenStack.cpp | 18 ++++++++++++++++++
 src/core/parser/stack/TokenStack.hpp | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

(limited to 'src')

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
@@ -37,6 +37,34 @@
 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.
@@ -65,6 +93,14 @@ 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
-- 
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