Add initial implementation of Dialogue Manager; include core scripts, scenes, and resources

addons/dialogue_manager/compiler/resolved_goto_data.gd

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+## Data associated with a dialogue jump/goto line.
+class_name DMResolvedGotoData extends RefCounted
+
+
+## The title that was specified
+var title: String = ""
+## The target line's ID
+var next_id: String = ""
+## An expression to determine the target line at runtime.
+var expression: Array[Dictionary] = []
+## The given line text with the jump syntax removed.
+var text_without_goto: String = ""
+## Whether this is a jump-and-return style jump.
+var is_snippet: bool = false
+## A parse error if there was one.
+var error: int
+## The index in the string where
+var index: int = 0
+
+# An instance of the compiler [RegEx] list.
+var regex: DMCompilerRegEx = DMCompilerRegEx.new()
+
+
+func _init(text: String, titles: Dictionary) -> void:
+	if not "=> " in text and not "=>< " in text: return
+
+	if "=> " in text:
+		text_without_goto = text.substr(0, text.find("=> ")).strip_edges()
+	elif "=>< " in text:
+		is_snippet = true
+		text_without_goto = text.substr(0, text.find("=>< ")).strip_edges()
+
+	var found: RegExMatch = regex.GOTO_REGEX.search(text)
+	if found == null:
+		return
+
+	title = found.strings[found.names.goto].strip_edges()
+	index = found.get_start(0)
+
+	if title == "":
+		error = DMConstants.ERR_UNKNOWN_TITLE
+		return
+
+	# "=> END!" means end the conversation, ignoring any "=><" chains.
+	if title == "END!":
+		next_id = DMConstants.ID_END_CONVERSATION
+
+	# "=> END" means end the current title (and go back to the previous one if there is one
+	# in the stack)
+	elif title == "END":
+		next_id = DMConstants.ID_END
+
+	elif titles.has(title):
+		next_id = titles.get(title)
+	elif title.begins_with("{{"):
+		var expression_parser: DMExpressionParser = DMExpressionParser.new()
+		var title_expression: Array[Dictionary] = expression_parser.extract_replacements(title, 0)
+		if title_expression[0].has("error"):
+			error = title_expression[0].error
+		else:
+			expression = title_expression[0].expression
+	else:
+		next_id = title
+		error = DMConstants.ERR_UNKNOWN_TITLE
+
+
+func _to_string() -> String:
+	return "%s =>%s %s (%s)" % [text_without_goto, "<" if is_snippet else "", title, next_id]