GLK: ADVSYS: In progress implementing input line parser

4 files changed, 106 insertions, 13 deletions

diff --git a/engines/glk/advsys/game.cpp b/engines/glk/advsys/game.cpp
index fe1221baf7..cd19623f5d 100644
--- a/engines/glk/advsys/game.cpp
+++ b/engines/glk/advsys/game.cpp
@@ -202,7 +202,7 @@ bool Game::match(int obj, int noun, int *adjectives) {
 	return true;
 }
 
-int Game::checkVerb(int *verbs) {
+int Game::checkVerb(const Common::Array<int> &verbs) {
 	// Iterate through the actions
 	for (int idx = 1; idx <= _actionCount; ++idx) {
 		if (hasVerb(idx, verbs))
@@ -212,7 +212,7 @@ int Game::checkVerb(int *verbs) {
 	return NIL;
 }
 
-int Game::findAction(int *verbs, int preposition, int flag) {
+int Game::findAction(const Common::Array<int> &verbs, int preposition, int flag) {
 	// Iterate through the actions
 	for (int idx = 1; idx <= _actionCount; ++idx) {
 		if ((preposition && !hasPreposition(idx, preposition)) || !hasVerb(idx, verbs))
@@ -301,23 +301,23 @@ bool Game::hasAdjective(int obj, int adjective) const {
 	return false;
 }
 
-bool Game::hasVerb(int act, int *verbs) const {
+bool Game::hasVerb(int act, const Common::Array<int> &verbs) const {
 	// Get the list of verbs
 	int link = getActionField(act, A_VERBS);
 
 	// Look for the verb
 	for (; link; link = readWord(link + L_NEXT)) {
-		int *verb = verbs;
+		Common::Array<int>::const_iterator verb = verbs.begin();
 		int word = readWord(link + L_DATA);
 
-		for (; *verb && word; link = readWord(link + L_NEXT)) {
+		for (; verb < verbs.end() && word; link = readWord(link + L_NEXT)) {
 			if (*verb != readWord(word + L_DATA))
 				break;
 
 			++verb;
 		}
 
-		if (!*verb && !word)
+		if (verb == verbs.end() && !word)
 			return true;
 	}
 
diff --git a/engines/glk/advsys/game.h b/engines/glk/advsys/game.h
index 99cfe26068..1b7c6f95b0 100644
--- a/engines/glk/advsys/game.h
+++ b/engines/glk/advsys/game.h
@@ -46,6 +46,19 @@ enum Action {
 };
 
 /**
+ * Word types
+ */
+enum WordType {
+	WT_UNKNOWN = 0,
+	WT_VERB = 1,
+	WT_NOUN = 2,
+	WT_ADJECTIVE = 3,
+	WT_PREPOSITION = 4,
+	WT_CONJUNCTION = 5,
+	WT_ARTICLE = 6
+};
+
+/**
  * Object fields
  */
 enum ObjectField {
@@ -169,7 +182,7 @@ private:
 	/**
 	 * Returns true if an action has a given verb
 	 */
-	bool hasVerb(int act, int *verbs) const;
+	bool hasVerb(int act, const Common::Array<int> &verbs) const;
 
 	/**
 	 * Returns true if an action is in a given list
@@ -253,8 +266,8 @@ public:
 	/**
 	 * Return a word's type
 	 */
-	int getWordType(int word) const {
-		return _wordTypeTable[word];
+	WordType getWordType(int word) const {
+		return (WordType)_wordTypeTable[word];
 	}
 
 	/**
@@ -265,12 +278,12 @@ public:
 	/**
 	 * Check to see if this is a valid verb
 	 */
-	int checkVerb(int *verbs);
+	int checkVerb(const Common::Array<int> &verbs);
 
 	/**
 	 * Find an action matching a given description
 	 */
-	int findAction(int *verbs, int preposition, int flag);
+	int findAction(const Common::Array<int> &verbs, int preposition, int flag);
 
 	/**
 	 * Get an object property
diff --git a/engines/glk/advsys/vm.cpp b/engines/glk/advsys/vm.cpp
index 21f79d596b..54ab84c9c6 100644
--- a/engines/glk/advsys/vm.cpp
+++ b/engines/glk/advsys/vm.cpp
@@ -85,7 +85,7 @@ OpcodeMethod VM::_METHODS[0x34] = {
 
 VM::VM(OSystem *syst, const GlkGameDescription &gameDesc) : GlkInterface(syst, gameDesc), Game(),
 		_fp(_stack), _pc(0), _status(IN_PROGRESS), _actor(-1), _action(-1), _dObject(-1),
-		_ndObjects(-1), _iObject(-1) {
+		_ndObjects(-1), _iObject(-1), _wordPtr(nullptr) {
 	Common::fill(&_nouns[0], &_nouns[20], 0);
 	Common::fill(&_nounWords[0], &_nounWords[20], -1);
 	Common::fill(&_adjectives[0], &_adjectives[20], (int *)nullptr);
@@ -452,6 +452,14 @@ bool VM::parseInput() {
 	if (!getLine())
 		return false;
 
+	// Check for actor
+	WordType wordType = getWordType(_words.front());
+	if (wordType == WT_ADJECTIVE || wordType == WT_NOUN) {
+		if (!(_actor = getNoun()))
+			return false;
+		flag |= A_ACTOR;
+	}
+
 	// TODO: stub
 	return false;
 }
@@ -475,6 +483,7 @@ bool VM::getLine() {
 			return false;
 	}
 
+	_wordPtr = _words.begin();
 	return true;
 }
 
@@ -505,6 +514,50 @@ bool VM::getWord(Common::String &line) {
 	}
 }
 
+bool VM::getNoun() {
+	// TODO: Stub
+	return false;
+}
+
+bool VM::getVerb() {
+	_verbs.clear();
+
+	if (_words.front() == NIL || getWordType(_words.front()) != WT_VERB) {
+		parseError();
+		return false;
+	}
+
+	_verbs.push_back(*_wordPtr++);
+
+	// Check for a word following the verb
+	if (!_words.empty()) {
+		_verbs.push_back(_words.front());
+
+		if (checkVerb(_verbs)) {
+			++_wordPtr;
+		} else {
+			_verbs.push_back(_words.back());
+
+			if (checkVerb(_verbs)) {
+				_words.pop_back();
+			} else {
+				_verbs.pop_back();
+
+				if (!checkVerb(_verbs)) {
+					parseError();
+					return false;
+				}
+			}
+		}
+	}
+
+	return true;
+}
+
+void VM::parseError() {
+	// TODO
+}
+
 bool VM::isWhitespace(char c) {
 	return c == ' ' || c == ',' || c == '.';
 }
diff --git a/engines/glk/advsys/vm.h b/engines/glk/advsys/vm.h
index d235bd878d..d3b7bfc8f6 100644
--- a/engines/glk/advsys/vm.h
+++ b/engines/glk/advsys/vm.h
@@ -113,6 +113,16 @@ enum FPOffset {
 	FP_ARGS = 3
 };
 
+/**
+ * Action flags
+ */
+enum ActionFlag {
+	A_ACTOR = 1,		///< Actor
+	A_DOBJECT = 2,		///< Direct object
+	A_IOBJECT = 4		///< Indirect object
+};
+
+
 class VM;
 typedef void (VM::*OpcodeMethod)();
 
@@ -192,6 +202,7 @@ class VM : public GlkInterface, public Game {
 		int _number;
 
 		InputWord() : _number(0) {}
+		operator int() const { return _number; }
 	};
 private:
 	// Execution fields
@@ -213,7 +224,8 @@ private:
 	int _ndObjects;
 	int _iObject;
 	Common::Array<InputWord> _words;
-	InputWord *_wordPtr;
+	Common::Array<InputWord>::iterator _wordPtr;
+	Common::Array<int> _verbs;
 private:
 	/**
 	 * Execute a single opcode within the script
@@ -252,6 +264,21 @@ private:
 	bool getWord(Common::String &line);
 
 	/**
+	 * Get a noun phrase and return the object it refers to
+	 */
+	bool getNoun();
+
+	/**
+	 * Get a verb phrase and return the action it refers to
+	 */
+	bool getVerb();
+
+	/**
+	 * Called when a parsing error occurs
+	 */
+	void parseError();
+
+	/**
 	 * Returns true if a passed character is a skippable whitespace
 	 */
 	static bool isWhitespace(char c);