did a bunch things to finalize

Dialogue.tscn

@@ -16,6 +16,8 @@ __meta__ = {
 script = ExtResource( 2 )
 path = "res://dialogue.yarn"
 auto_start = true
+variable_storage = {
+}
 
 [node name="RichTextLabel" type="RichTextLabel" parent="."]
 anchor_right = 1.0

addons/Wol/Wol.gd

@@ -17,15 +17,17 @@ signal started
 signal finished
 
 export(String, FILE, '*.wol,*.yarn') var path setget set_path
-export(String) var start_node = 'Start'
+
-export(bool) var auto_start = false
+export var starting_node = 'Start'
+export var auto_start = false
 export var auto_show_options = true
+export var auto_substitute = true
 
 export(Dictionary) var variable_storage = {}
 
 const Constants = preload('res://addons/Wol/core/Constants.gd')
-const WolCompiler = preload('res://addons/Wol/core/compiler/Compiler.gd')
+const Compiler = preload('res://addons/Wol/core/compiler/Compiler.gd')
-const WolLibrary = preload('res://addons/Wol/core/Library.gd')
+const Library = preload('res://addons/Wol/core/Library.gd')
 const VirtualMachine = preload('res://addons/Wol/core/VirtualMachine.gd')
 const StandardLibrary = preload('res://addons/Wol/core/StandardLibrary.gd')
 
@@ -35,10 +37,11 @@ func _ready():
 	if Engine.editor_hint:
 		return
 	
-	var libraries = WolLibrary.new()
+	var libraries = Library.new()
-	libraries.import_library(StandardLibrary.new())
 	virtual_machine = VirtualMachine.new(self, libraries)
 
+	libraries.import_library(StandardLibrary.new())
+
 	set_path(path)
 
 	if auto_start:
@@ -48,10 +51,16 @@ func set_path(_path):
 	path = _path
 
 	if not Engine.editor_hint and virtual_machine:
-		var compiler = WolCompiler.new(path)
+		var compiler = Compiler.new(path)
 		virtual_machine.program = compiler.compile()
 
 func _on_line(line):
+	if auto_substitute:
+		var index = 0
+		for substitute in line.substitutions:
+			line.text = line.text.replace('{%d}' % index, substitute)
+			index += 1
+	
 	call_deferred('emit_signal', 'line', line)
 	if auto_show_options \
 			and virtual_machine.get_next_instruction().operation == Constants.ByteCode.AddOption:
@@ -88,7 +97,7 @@ func select_option(id):
 func pause():
 	virtual_machine.call_deferred('pause')
 
-func start(node = start_node):
+func start(node = starting_node):
 	emit_signal('started')
 
 	virtual_machine.set_node(node)

addons/Wol/core/FunctionInfo.gd

@@ -1,5 +1,6 @@
 extends Object
-var Value : GDScript = load("res://addons/Wol/core/Value.gd")
+
+const Value = preload("res://addons/Wol/core/Value.gd")
 
 var name = ''
 # NOTE: -1 means variable arguments
@@ -18,12 +19,18 @@ func invoke(parameters = []):
 	if parameters != null:
 		length = parameters.size()
 
-	if check_param_count(length):
+	if check_parameter_count(length):
 		if returns_value:
+			var return_value
 			if length > 0:
-				return Value.new(function.call_funcv(parameters))
+				return_value = function.call_funcv(parameters)
 			else:
-				return Value.new(function.call_func())
+				return_value = function.call_func()
+
+			if return_value is Value:
+				return return_value
+			else:
+				return Value.new(return_value)
 		else:
 			if length > 0:
 				function.call_funcv(parameters)
@@ -31,5 +38,5 @@ func invoke(parameters = []):
 				function.call_func()
 	return null
 
-func check_param_count(_parameter_count):
+func check_parameter_count(_parameter_count):
 	return parameter_count == _parameter_count or parameter_count == -1

addons/Wol/core/StandardLibrary.gd

@@ -72,25 +72,14 @@ func xor(param1, param2):
 func lnot(param1):
 	return not param1.as_bool()
 
-var visited_node_count = {}
+func is_node_visited(node = virtual_machine.current_node.name):
-
-func is_node_visited(node = virtual_machine.current_node_name()):
 	return node_visit_count(node) > 0
 
-func node_visit_count(node = virtual_machine.current_node_name()):
+func node_visit_count(node = virtual_machine.current_node.name):
 	if node is Value:
 		node = virtual_machine.program.strings[node.value()].text
 
-	var visit_count = 0
+	var variable_storage = virtual_machine.dialogue.variable_storage
-	if visited_node_count.has(node):
+	var visited_node_count = variable_storage[virtual_machine.program.filename]
-		visit_count = visited_node_count[node]
 
-	return visit_count
+	return visited_node_count[node] if visited_node_count.has(node) else 0
-
-func get_visited_nodes():
-	return visited_node_count.keys()
-
-func set_visited_nodes(visitedList):
-	visited_node_count.clear()
-	for string in visitedList:
-		visited_node_count[string] = 1

addons/Wol/core/VirtualMachine.gd

@@ -1,6 +1,7 @@
-extends Node
+extends Object
 
 const Constants = preload('res://addons/Wol/core/Constants.gd')
+const Program = preload('res://addons/Wol/core/Program.gd')
 const Value = preload('res://addons/Wol/core/Value.gd')
 
 # Function references to handlers
@@ -59,8 +60,17 @@ func set_node(name):
 
 	current_node = program.nodes[name]
 	reset()
+
 	state.current_node_name = name
 	node_start_handler.call_func(name)
+
+	if not dialogue.variable_storage.has(program.filename):
+		dialogue.variable_storage[program.filename] = {}
+
+	if not dialogue.variable_storage[program.filename].has(name):
+		dialogue.variable_storage[program.filename][name] = 0
+
+	dialogue.variable_storage[program.filename][name] += 1
 	return true
 
 func pause():
@@ -91,8 +101,8 @@ func reset():
 	state = VmState.new()
 
 func get_next_instruction():
-	if current_node.instructions.size() - 1 > state.programCounter:
+	if current_node.instructions.size() - 1 > state.program_counter:
-		return current_node.instructions[state.programCounter + 1]
+		return current_node.instructions[state.program_counter + 1]
 	return
 
 func start():
@@ -115,14 +125,13 @@ func resume():
 
 	execution_state = Constants.ExecutionState.Running
 	
-	#execute instruction until something cool happens
 	while execution_state == Constants.ExecutionState.Running:
-		var current_instruction = current_node.instructions[state.programCounter]
+		var current_instruction = current_node.instructions[state.program_counter]
 		run_instruction(current_instruction)
-		state.programCounter += 1
+		state.program_counter += 1
 
-		if state.programCounter >= current_node.instructions.size():
+		if state.program_counter >= current_node.instructions.size():
-			node_finished_handler.call_func(current_node.nodeName)
+			node_finished_handler.call_func(current_node.name)
 			execution_state = Constants.ExecutionState.Stopped
 			reset()
 			dialogue_finished_handler.call_func()
@@ -142,17 +151,22 @@ func run_instruction(instruction):
 
 		# Jump to named label
 		Constants.ByteCode.JumpTo:
-			state.programCounter = find_label_instruction(instruction.operands[0].value) - 1
+			state.program_counter = find_label_instruction(instruction.operands[0].value) - 1
 
 		Constants.ByteCode.RunLine:
 			# Lookup string and give back as line
 			var key = instruction.operands[0].value
-			var line = program.strings[key]
+			var line = program.strings[key].clone()
 
 			# The second operand is the expression count of format function
-			# TODO: Add format functions supportk
+			# TODO: Add format functions support
+			line.substitutions = []
 			if instruction.operands.size() > 1:
-				pass
+				var expression_count = int(instruction.operands[1].value)
+
+				while expression_count > 0:
+					line.substitutions.append(state.pop_value().as_string())
+					expression_count -= 1
 
 			var return_state = line_handler.call_func(line)
 			
@@ -177,12 +191,12 @@ func run_instruction(instruction):
 		# Jump to named label if value of stack top is false
 		Constants.ByteCode.JumpIfFalse:
 			if not state.peek_value().as_bool():
-			 state.programCounter = find_label_instruction(instruction.operands[0].value) - 1
+			 state.program_counter = find_label_instruction(instruction.operands[0].value) - 1
 				
 		# Jump to label whose name is on the stack
 		Constants.ByteCode.Jump:
 			var destination = state.peek_value().as_string()
-			state.programCounter = find_label_instruction(destination) - 1
+			state.program_counter = find_label_instruction(destination) - 1
 
 		Constants.ByteCode.Pop:
 			state.pop_value()
@@ -204,25 +218,29 @@ func run_instruction(instruction):
 			if actual_parameter_count == 0:
 				result = function.invoke()
 			else:
-				var params = []
+				var parameters = []
 				for _i in range(actual_parameter_count):
-					params.push_front(state.pop_value())
+					parameters.push_front(state.pop_value())
 
-				result = function.invoke(params)
+				result = function.invoke(parameters)
 
 			if function.returns_value:
 				state.push_value(result)
 
 		Constants.ByteCode.PushVariable:
 			var name = instruction.operands[0].value
-			var godot_value = dialogue.variable_storage[name]
+			var value = dialogue.variable_storage[name.replace('$', '')]
-			var value = Value.new(godot_value)
 			state.push_value(value)
 
 		Constants.ByteCode.StoreVariable:
 			var value = state.peek_value()
+			if value.type == Constants.ValueType.Str:
+				value = program.strings[value.value()].text
+			else:
+				value = value.value()
+
 			var name = instruction.operands[0].value.replace('$', '')
-			dialogue.variable_storage[name] = value.value()
+			dialogue.variable_storage[name] = value
 
 		Constants.ByteCode.Stop:
 			node_finished_handler.call_func(current_node.name)
@@ -239,15 +257,15 @@ func run_instruction(instruction):
 
 			var return_state = node_finished_handler.call_func(current_node.name)
 			set_node(name)
-			state.programCounter -= 1
+
 			if return_state == Constants.HandlerState.PauseExecution:
 				execution_state = Constants.ExecutionState.Suspended
 
 		Constants.ByteCode.AddOption:
 			var key = instruction.operands[0].value
-			var line = program.strings[key]
+			var line = program.strings[key].clone()
 
-			# TODO: Add format functions supportk
+			# TODO: Add format functions support
 			if instruction.operands.size() > 2:
 				pass
 			
@@ -280,11 +298,11 @@ func run_instruction(instruction):
 
 class VmState:
 	var current_node_name = ''
-	var programCounter = 0
+	var program_counter = 0
 	var current_options = []
 	var stack = []
 
-	func push_value(value)->void:
+	func push_value(value):
 		if value is Value:
 			stack.push_back(value)
 		else:

addons/Wol/core/compiler/compiler.gd

@@ -79,7 +79,6 @@ func compile():
 		line_number += 1
 
 		body = PoolStringArray(body_lines).join('\n')
-
 		var lexer = Lexer.new(filename, title, body)
 		var tokens = lexer.tokenize()
 
@@ -94,6 +93,7 @@ func compile():
 			line_number += 1
 
 	var program = Program.new()
+	program.filename = filename
 
 	for node in parsed_nodes:
 		compile_node(program, node)
@@ -203,7 +203,7 @@ func generate_statement(node, statement):
 			generate_assignment(node, statement.assignment)
 
 		Constants.StatementTypes.Line:
-			generate_line(node, statement,statement.line)
+			generate_line(node, statement)
 		_:
 			assert(false, 'Illegal statement type [%s]. Could not generate code.' % statement.type)
 
@@ -218,12 +218,19 @@ func generate_custom_command(node, command):
 		else :
 			emit(Constants.ByteCode.RunCommand, node, [Program.Operand.new(command_string)])
 
-func generate_line(node, statement, line):
+func generate_line(node, statement):
 	# TODO: Implement proper line numbers (global and local)
-	var num = register_string(line, node.name, '', statement.line_number, []);
+	var line = statement.line
-	emit(Constants.ByteCode.RunLine, node, [Program.Operand.new(num)])
+	var expression_count = line.substitutions.size()
 
-func generate_shortcut_group(node,shortcut_group):
+	while not line.substitutions.empty():
+		var inline_expression = line.substitutions.pop_back()
+		generate_expression(node, inline_expression.expression)
+	
+	var num = register_string(line.line_text, node.name, line.line_id, statement.line_number, line.tags);
+	emit(Constants.ByteCode.RunLine, node,[Program.Operand.new(num), Program.Operand.new(expression_count)])
+
+func generate_shortcut_group(node, shortcut_group):
 	var end = register_label('group_end')
 	var labels = []
 	var option_count = 0
@@ -243,7 +250,8 @@ func generate_shortcut_group(node,shortcut_group):
 		var label_string_id = register_string(
 			option.label,
 			node.name,
-			label_line_id,option.line_number,
+			label_line_id,
+			option.line_number,
 			[]
 		)
 		
@@ -287,7 +295,7 @@ func generate_if(node, if_statement):
 			generate_expression(node, clause.expression)
 			emit(Constants.ByteCode.JumpIfFalse, node, [Program.Operand.new(end_clause)])
 		
-		generate_block(node,clause.statements)
+		generate_block(node, clause.statements)
 		emit(Constants.ByteCode.JumpTo, node, [Program.Operand.new(endif)])
 
 		if clause.expression != null:

addons/Wol/core/compiler/lexer.gd

@@ -17,6 +17,8 @@ const ASSIGNMENT = 'assignment'
 const OPTION = 'option'
 const OR = 'or'
 const DESTINATION = 'destination'
+const INLINE = 'inline'
+const FORMAT_FUNCTION = 'format'
 
 var WHITESPACE = '\\s*'
 
@@ -84,27 +86,40 @@ func createstates():
 	patterns[Constants.TokenType.EndIf] = ['endif(?!\\w)', '"endif"']
 	patterns[Constants.TokenType.Set] = ['set(?!\\w)', '"set"']
 	patterns[Constants.TokenType.ShortcutOption] = ['\\-\\>\\s*', '"->"']
+	patterns[Constants.TokenType.ExpressionFunctionStart] = ['\\{', '"{"']
+	patterns[Constants.TokenType.ExpressionFunctionEnd] = ['\\}', '"}"']
+	patterns[Constants.TokenType.FormatFunctionStart] = ['(?<!\\[)\\[(?!\\[)', '"["']
+	patterns[Constants.TokenType.FormatFunctionEnd] = ['\\]', '"]"']
 
 	var shortcut_option = SHORTCUT + DASH + OPTION
 	var shortcut_option_tag = shortcut_option + DASH + TAG
 	var command_or_expression = COMMAND + DASH + OR + DASH + EXPRESSION
 	var link_destination = LINK + DASH + DESTINATION
+	var format_expression = FORMAT_FUNCTION + DASH + EXPRESSION
+	var inline_expression = INLINE + DASH + EXPRESSION
+	var link_inline_expression = LINK + DASH + INLINE + DASH + EXPRESSION
+	var link_format_expression = LINK + DASH + FORMAT_FUNCTION + DASH + EXPRESSION
 
 	states = {}
 
 	states[BASE] = LexerState.new(patterns)
 	states[BASE].add_transition(Constants.TokenType.BeginCommand, COMMAND, true)
+	states[BASE].add_transition(Constants.TokenType.ExpressionFunctionStart, inline_expression, true)
+	states[BASE].add_transition(Constants.TokenType.FormatFunctionStart, FORMAT_FUNCTION, true)
 	states[BASE].add_transition(Constants.TokenType.OptionStart, LINK, true)
 	states[BASE].add_transition(Constants.TokenType.ShortcutOption, shortcut_option)
 	states[BASE].add_transition(Constants.TokenType.TagMarker, TAG, true)
 	states[BASE].add_text_rule(Constants.TokenType.Text)
 
+	#TODO: FIXME - Tags are not being proccessed properly this way. We must look for the format #{identifier}:{value}
+	#              Possible solution is to add more transitions
 	states[TAG] = LexerState.new(patterns)
 	states[TAG].add_transition(Constants.TokenType.Identifier, BASE)
 
 	states[shortcut_option] = LexerState.new(patterns)
 	states[shortcut_option].track_indent = true
 	states[shortcut_option].add_transition(Constants.TokenType.BeginCommand, EXPRESSION, true)
+	states[shortcut_option].add_transition(Constants.TokenType.ExpressionFunctionStart, inline_expression, true)
 	states[shortcut_option].add_transition(Constants.TokenType.TagMarker, shortcut_option_tag, true)
 	states[shortcut_option].add_text_rule(Constants.TokenType.Text, BASE)
 	
@@ -134,40 +149,42 @@ func createstates():
 	states[ASSIGNMENT].add_transition(Constants.TokenType.MultiplyAssign, EXPRESSION)
 	states[ASSIGNMENT].add_transition(Constants.TokenType.DivideAssign, EXPRESSION)
 
+	states[FORMAT_FUNCTION] = LexerState.new(patterns)
+	states[FORMAT_FUNCTION].add_transition(Constants.TokenType.FormatFunctionEnd, BASE, true)
+	states[FORMAT_FUNCTION].add_transition(Constants.TokenType.ExpressionFunctionStart, format_expression, true)
+	states[FORMAT_FUNCTION].add_text_rule(Constants.TokenType.Text)
+
+
+	states[format_expression] = LexerState.new(patterns)
+	states[format_expression].add_transition(Constants.TokenType.ExpressionFunctionEnd, FORMAT_FUNCTION)
+	form_expression_state(states[format_expression])
+
+	states[inline_expression] = LexerState.new(patterns)
+	states[inline_expression].add_transition(Constants.TokenType.ExpressionFunctionEnd, BASE)
+	form_expression_state(states[inline_expression])
+
 	states[EXPRESSION] = LexerState.new(patterns)
 	states[EXPRESSION].add_transition(Constants.TokenType.EndCommand, BASE)
-	states[EXPRESSION].add_transition(Constants.TokenType.Number)
+	# states[EXPRESSION].add_transition(Constants.TokenType.FormatFunctionEnd, BASE)
-	states[EXPRESSION].add_transition(Constants.TokenType.Str)
+	form_expression_state(states[EXPRESSION])
-	states[EXPRESSION].add_transition(Constants.TokenType.LeftParen)
-	states[EXPRESSION].add_transition(Constants.TokenType.RightParen)
-	states[EXPRESSION].add_transition(Constants.TokenType.EqualTo)
-	states[EXPRESSION].add_transition(Constants.TokenType.EqualToOrAssign)
-	states[EXPRESSION].add_transition(Constants.TokenType.NotEqualTo)
-	states[EXPRESSION].add_transition(Constants.TokenType.GreaterThanOrEqualTo)
-	states[EXPRESSION].add_transition(Constants.TokenType.GreaterThan)
-	states[EXPRESSION].add_transition(Constants.TokenType.LessThanOrEqualTo)
-	states[EXPRESSION].add_transition(Constants.TokenType.LessThan)
-	states[EXPRESSION].add_transition(Constants.TokenType.Add)
-	states[EXPRESSION].add_transition(Constants.TokenType.Minus)
-	states[EXPRESSION].add_transition(Constants.TokenType.Multiply)
-	states[EXPRESSION].add_transition(Constants.TokenType.Divide)
-	states[EXPRESSION].add_transition(Constants.TokenType.Modulo)
-	states[EXPRESSION].add_transition(Constants.TokenType.And)
-	states[EXPRESSION].add_transition(Constants.TokenType.Or)
-	states[EXPRESSION].add_transition(Constants.TokenType.Xor)
-	states[EXPRESSION].add_transition(Constants.TokenType.Not)
-	states[EXPRESSION].add_transition(Constants.TokenType.Variable)
-	states[EXPRESSION].add_transition(Constants.TokenType.Comma)
-	states[EXPRESSION].add_transition(Constants.TokenType.TrueToken)
-	states[EXPRESSION].add_transition(Constants.TokenType.FalseToken)
-	states[EXPRESSION].add_transition(Constants.TokenType.NullToken)
-	states[EXPRESSION].add_transition(Constants.TokenType.Identifier)
 
 	states[LINK] = LexerState.new(patterns)
 	states[LINK].add_transition(Constants.TokenType.OptionEnd, BASE, true)
+	states[LINK].add_transition(Constants.TokenType.ExpressionFunctionStart, link_inline_expression, true)
+	states[LINK].add_transition(Constants.TokenType.FormatFunctionStart, link_format_expression, true)
+	states[LINK].add_transition(Constants.TokenType.FormatFunctionEnd, LINK, true)
 	states[LINK].add_transition(Constants.TokenType.OptionDelimit, link_destination, true)
 	states[LINK].add_text_rule(Constants.TokenType.Text)
 
+	states[link_format_expression] = LexerState.new(patterns)
+	states[link_format_expression].add_transition(Constants.TokenType.FormatFunctionEnd, LINK, true)
+	states[link_format_expression].add_transition(Constants.TokenType.ExpressionFunctionStart, link_inline_expression, true)
+	states[link_format_expression].add_text_rule(Constants.TokenType.Text)
+
+	states[link_inline_expression] = LexerState.new(patterns)
+	states[link_inline_expression].add_transition(Constants.TokenType.ExpressionFunctionEnd, LINK)
+	form_expression_state(states[link_inline_expression])
+
 	states[link_destination] = LexerState.new(patterns)
 	states[link_destination].add_transition(Constants.TokenType.Identifier)
 	states[link_destination].add_transition(Constants.TokenType.OptionEnd, BASE)
@@ -177,6 +194,34 @@ func createstates():
 	for key in states.keys():
 		states[key].name = key
 
+func form_expression_state(expression_state):
+	expression_state.add_transition(Constants.TokenType.Number)
+	expression_state.add_transition(Constants.TokenType.Str)
+	expression_state.add_transition(Constants.TokenType.LeftParen)
+	expression_state.add_transition(Constants.TokenType.RightParen)
+	expression_state.add_transition(Constants.TokenType.EqualTo)
+	expression_state.add_transition(Constants.TokenType.EqualToOrAssign)
+	expression_state.add_transition(Constants.TokenType.NotEqualTo)
+	expression_state.add_transition(Constants.TokenType.GreaterThanOrEqualTo)
+	expression_state.add_transition(Constants.TokenType.GreaterThan)
+	expression_state.add_transition(Constants.TokenType.LessThanOrEqualTo)
+	expression_state.add_transition(Constants.TokenType.LessThan)
+	expression_state.add_transition(Constants.TokenType.Add)
+	expression_state.add_transition(Constants.TokenType.Minus)
+	expression_state.add_transition(Constants.TokenType.Multiply)
+	expression_state.add_transition(Constants.TokenType.Divide)
+	expression_state.add_transition(Constants.TokenType.Modulo)
+	expression_state.add_transition(Constants.TokenType.And)
+	expression_state.add_transition(Constants.TokenType.Or)
+	expression_state.add_transition(Constants.TokenType.Xor)
+	expression_state.add_transition(Constants.TokenType.Not)
+	expression_state.add_transition(Constants.TokenType.Variable)
+	expression_state.add_transition(Constants.TokenType.Comma)
+	expression_state.add_transition(Constants.TokenType.TrueToken)
+	expression_state.add_transition(Constants.TokenType.FalseToken)
+	expression_state.add_transition(Constants.TokenType.NullToken)
+	expression_state.add_transition(Constants.TokenType.Identifier)
+
 func tokenize():
 	var tokens = []
 
@@ -371,7 +416,7 @@ class Token:
 		value = _value
 
 	func _to_string():
-		return '%s (%s) at %s:%s (state: %s)' % [Constants.token_type_name(type),value, line_number, column, lexer_state]
+		return '%s (%s) at %s:%s (state: %s)' % [Constants.token_type_name(type), value, line_number, column, lexer_state]
 	
 class LexerState:
 	var name = ''

addons/Wol/core/compiler/parser.gd

@@ -87,8 +87,6 @@ class ParseNode:
 		var tokens = _parser.tokens as Array
 		if tokens.size() > 0:
 			line_number = tokens.front().line_number
-		else:
-			line_number = -1
 
 		tags = []
 
@@ -132,6 +130,105 @@ class WolNode extends ParseNode:
 class Header extends ParseNode:
 	pass
 
+class InlineExpression extends ParseNode:
+	var expression
+
+	func _init(parent, parser).(parent, parser):
+		parser.expect_symbol([Constants.TokenType.ExpressionFunctionStart])
+		expression = ExpressionNode.parse(self, parser)
+		parser.expect_symbol([Constants.TokenType.ExpressionFunctionEnd])
+
+	static func can_parse(parser):
+		return parser.next_symbol_is([Constants.TokenType.ExpressionFunctionStart])
+
+	func tree_string(_indent_level):
+		return "InlineExpression:"
+
+# Returns a format_text string as [ name "{0}" key1="value1" key2="value2" ]
+class FormatFunctionNode extends ParseNode:
+	var format_text = ''
+	var expression_value
+
+	func _init(parent:ParseNode, parser, expressionCount:int).(parent, parser):
+		format_text="["
+		parser.expect_symbol([Constants.TokenType.FormatFunctionStart])
+
+		while !parser.next_symbol_is([Constants.TokenType.FormatFunctionEnd]):
+			if parser.next_symbol_is([Constants.TokenType.Text]):
+				format_text += parser.expect_symbol().value
+
+			if InlineExpression.can_parse(parser):
+				expression_value = InlineExpression.new(self, parser)
+				format_text +=" \"{%d}\" " % expressionCount
+		parser.expect_symbol()
+		format_text+="]"
+
+	static func can_parse(parser):
+		return parser.next_symbol_is([Constants.TokenType.FormatFunctionStart])
+
+	# TODO: Make format prettier and add more information
+	func tree_string(_indent_level):
+		return "FormatFunction"
+
+class LineNode extends ParseNode:
+	var line_text = ''
+	# FIXME: Right now we are putting the formatfunctions and inline expressions in the same
+	#        list but if at some point we want to stronly type our sub list we need to make a new
+	#        parse node that can have either an InlineExpression or a FunctionFormat
+	#        .. This is a consideration for Godot4.x
+	var substitutions = []
+	var line_id = ''
+	var line_tags = []
+
+	# NOTE: If format function an inline functions are both present
+	# 		returns a line in the format "Some text {0} and some other {1}[format "{2}" key="value" key="value"]"
+
+	func _init(parent, parser).(parent, parser):
+		while parser.next_symbol_is(
+				[
+					Constants.TokenType.FormatFunctionStart,
+					Constants.TokenType.ExpressionFunctionStart,
+					Constants.TokenType.Text,
+					Constants.TokenType.TagMarker
+				]
+			):
+
+			if FormatFunctionNode.can_parse(parser):
+				var format_function = FormatFunctionNode.new(self, parser, substitutions.size())
+				if format_function.expression_value != null:
+					substitutions.append(format_function.expression_value)
+
+				line_text += format_function.format_text
+
+			elif InlineExpression.can_parse(parser):
+				var inline_expression = InlineExpression.new(self, parser)
+				line_text += '{%d}' % substitutions.size()
+				substitutions.append(inline_expression)
+
+			elif parser.next_symbols_are([Constants.TokenType.TagMarker, Constants.TokenType.Identifier]):
+				parser.expect_symbol()
+				var tag_token = parser.expect_symbol([ Constants.TokenType.Identifier ])
+				if tag_token.value.begins_with("line:"):
+					if line_id.empty():
+						line_id = tag_token.value
+					else:
+						printerr("Too many line_tags @[%s:%d]" %[parser.currentNodeName, tag_token.line_number])
+						return
+				else:
+					tags.append(tag_token.value)
+
+			else:
+				var token = parser.expect_symbol()
+				if token.line_number == line_number and token.type != Constants.TokenType.BeginCommand:
+					line_text += token.value
+				else:
+					parser.tokens.push_front(token)
+					break
+
+
+	func tree_string(indent_level):
+		return tab(indent_level, 'Line: (%s)[%d]' % [line_text, substitutions.size()])
+
 class Statement extends ParseNode:
 	var Type = Constants.StatementTypes
 
@@ -142,7 +239,7 @@ class Statement extends ParseNode:
 	var assignment
 	var shortcut_option_group
 	var custom_command
-	var line = ''
+	var line
 
 	func _init(parent, parser).(parent, parser):
 		if Block.can_parse(parser):
@@ -170,7 +267,7 @@ class Statement extends ParseNode:
 			type = Type.CustomCommand
 
 		elif parser.next_symbol_is([Constants.TokenType.Text]):
-			line = parser.expect_symbol([Constants.TokenType.Text]).value
+			line = LineNode.new(self, parser)
 			type = Type.Line
 
 		else:
@@ -203,7 +300,7 @@ class Statement extends ParseNode:
 			Type.CustomCommand:
 				info.append(custom_command.tree_string(indent_level))
 			Type.Line:
-				info.append(tab(indent_level, 'Line: %s' % line))
+				info.append(line.tree_string(indent_level))
 			_:
 				printerr('Cannot print statement')
 
@@ -233,11 +330,14 @@ class CustomCommand extends ParseNode:
 		
 		#if first token is identifier and second is leftt parenthesis
 		#evaluate as function
-		if (command_tokens.size() > 1 && command_tokens[0].type == Constants.TokenType.Identifier
+		if command_tokens.size() > 1 \
-			&& command_tokens[1].type == Constants.TokenType.LeftParen):
+				and command_tokens[0].type == Constants.TokenType.Identifier \
+				and command_tokens[1].type == Constants.TokenType.LeftParen:
+
 			var p = get_script().new(command_tokens, parser.library)
 			expression = ExpressionNode.parse(self, p)
 			type = Type.Expression
+
 		else:
 			#otherwise evaluuate command
 			type = Type.ClientCommand
@@ -545,10 +645,10 @@ class ExpressionNode extends ParseNode:
 	var parameters = []
 
 	func _init(parent, parser, _value, _function = '', _parameters = []).(parent, parser):
-
 		if _value != null:
 			type = Constants.ExpressionType.Value
 			value = _value
+
 		else:
 			type = Constants.ExpressionType.FunctionCall
 			function = _function
@@ -568,7 +668,7 @@ class ExpressionNode extends ParseNode:
 
 		return info.join('')
 
-	# using Djikstra's shunting-yard algorithm to convert stream of expresions into postfix notation,
+	# Using Djikstra's shunting-yard algorithm to convert stream of expresions into postfix notation,
 	# & then build a tree of expressions
 	static func parse(parent, parser):
 		var rpn = []
@@ -595,7 +695,7 @@ class ExpressionNode extends ParseNode:
 		var last
 
 		#read expression content
-		while parser.tokens.size() > 0 && parser.next_symbol_is(valid_types):
+		while parser.tokens.size() > 0 and parser.next_symbol_is(valid_types):
 			var next = parser.expect_symbol(valid_types)
 
 			if next.type == Constants.TokenType.Variable \
@@ -633,7 +733,7 @@ class ExpressionNode extends ParseNode:
 				
 				#find the closest function on stack
 				#increment parameters
-				func_stack.back().param_count+=1
+				func_stack.back().parameter_count+=1
 				
 			elif Operator.is_op(next.type):
 				#this is an operator
@@ -685,7 +785,7 @@ class ExpressionNode extends ParseNode:
 					#else
 					#we have more than 1 param
 					if last.type != Constants.TokenType.LeftParen:
-						func_stack.back().param_count+=1
+						func_stack.back().parameter_count+=1
 					
 					rpn.append(op_stack.pop_back())
 					func_stack.pop_back()
@@ -730,7 +830,7 @@ class ExpressionNode extends ParseNode:
 				var function_name = next.value
 
 				var function_parameters = []
-				for _i in range(next.param_count):
+				for _i in range(next.parameter_count):
 					function_parameters.append(eval_stack.pop_back())
 				
 				function_parameters.invert()
@@ -802,7 +902,7 @@ class Assignment extends ParseNode:
 		info.append(tab(indent_level + 1, destination))
 		info.append(tab(indent_level + 1, Constants.token_type_name(operation)))
 		info.append(value.tree_string(indent_level + 1))
-		return info.join('')
+		return PoolStringArray(info).join('')
 
 		
 	static func can_parse(parser):

addons/Wol/core/constants.gd

@@ -76,6 +76,12 @@ enum TokenType {
 	#8 Command syntax ('<<foo>>')
 	BeginCommand, EndCommand,
 
+	ExpressionFunctionStart, # {
+	ExpressionFunctionEnd, # }
+
+	FormatFunctionStart, # [
+	FormatFunctionEnd,   # ]
+
 	#10 Variables ('$foo')
 	Variable,
 
@@ -145,7 +151,8 @@ enum TokenType {
 }
 
 enum ExpressionType {
-	Value, FunctionCall
+	Value,
+	FunctionCall
 }
 
 enum StatementTypes {
@@ -155,7 +162,8 @@ enum StatementTypes {
 	IfStatement,
 	OptionStatement,
 	AssignmentStatement,
-	Line
+	Line,
+	InlineExpression
 }
 
 enum ValueType {

addons/Wol/core/library.gd

@@ -15,6 +15,7 @@ func get_function(name):
 
 func import_library(other):
 	Constants.merge_dir(functions, other.functions)
+	other.virtual_machine = virtual_machine
 
 func register_function(name, parameter_count, function, returns_value):
 	var functionInfo = FunctionInfo.new(name, parameter_count, function, returns_value)

addons/Wol/core/program.gd

@@ -3,6 +3,7 @@ extends Object
 const Constants = preload('res://addons/Wol/core/Constants.gd')
 
 var name = ''
+var filename = ''
 var strings = {}
 var nodes = {}
 
@@ -12,6 +13,7 @@ class Line:
 	var line_number = -1
 	var file_name = ''
 	var implicit = false
+	var substitutions = []
 	var meta = []
 
 	func _init(_text, _node_name, _line_number, _file_name, _implicit, _meta):
@@ -21,6 +23,13 @@ class Line:
 		implicit = _implicit
 		meta = _meta
 
+	func clone():
+		return get_script().new(text, node_name, line_number, file_name, implicit, meta)
+
+	func _to_string():
+		return '%s:%d: "%s"' % [file_name.get_file(), line_number, text]
+
+
 class Option:
 	var line
 	var id = -1
@@ -31,6 +40,9 @@ class Option:
 		id = _id
 		destination = _destination
 
+	func clone():
+		return get_script().new(self)
+
 class Command:
 	var command = ''
 

addons/Wol/core/value.gd

@@ -2,9 +2,6 @@ extends Object
 
 const Constants = preload('res://addons/Wol/core/Constants.gd')
 
-const NULL_STRING = 'null'
-const FALSE_STRING = 'false'
-const TRUE_STRING = 'true'
 const NANI = 'NaN'
 
 var type = Constants.ValueType.Nullean
@@ -74,7 +71,7 @@ func set_value(value):
 
 func add(other):
 	if type == Constants.ValueType.Str or other.type == Constants.ValueType.Str:
-		return get_script().new('%s%s'%[value(),other.value()])
+		return get_script().new('%s%s' % [value(), other.value()])
 	if type == Constants.ValueType.Number and other.type == Constants.ValueType.Number:
 		return get_script().new(number + other.number)
 	return null

dialogue.yarn

@@ -7,24 +7,53 @@ position: 0, 0
 <<command_with multiple arguments>>
 
 // remove "to" to trigger error
-<<set $direction to 'this'>>
+<<set $direction to 'that'>>
 <<set $one to 1>>
 
 // Implement inline expressions 
-Bob: Theresa, {$direction} way! #line:5d7a7c
+<<if visit_count() == 1>>
-Theresa: Did you know one + one equals {$one + $one}?
+Narrator: You, {$direction} way! 
-Bob: You wanna go somewhere?
+<<endif>>
+Narrator: Do you know you've been here {visit_count()} times?
+You: Did you know one + one equals {$one + $one}?
+Narrator: You wanna go somewhere?
 
-[[Go to the store|TheStore]]
+ -> Go to the store
-[[Lets stay here and talk|Talk]]
+     [[TheStore]]
+// -> Wait, how many times have I been to the store?
+//       Narrator: You've been to the store {visit_count('TheStore')} times.
+//       [[Start]]
+-> Lets stay here and talk
+    [[Talk]]
 ===
 title: TheStore
 tags: 
 colorID: 0
 position: 0, 200
 ---
-Clerk: Welcome to the store.
+Guy: Hey what's up I need your help can you come here?
-Clerk: Can I help you with anything?
+You: Well I can't I'm buying clothes.
+All right well hurry up and come over here.
+You: I can't find them.
+Guy: What do you mean you can't find them?
+You: I can't find them there's only soup.
+Guy: What do you mean there's only soup?! 
+You: It means there's only soup.
+Guy: WELL THEN GET OUT OF THE SOUP ISLE!!
+You: Alright you dont have to shout at me!
+You: There's more soup.
+Guy: What do you mean there's more soup? 
+You: There's just more soup.
+Guy: Then go to the next aisle!
+You: There's still soup! 
+Guy: Where are you right now?!
+You: I'm at soup!
+Guy: What do you mean you're at soup?! 
+You: I mean I'm at soup.
+Guy: WHAT STORE ARE YOU IN?!
+You: IM AT THE SOUP STORE!!
+Guy: WHY ARE YOU BUYING CLOTHES AT THE SOUP STORE?!
+You: FUCK YOU!
 [[Go home|Start]]
 ===
 title: Talk
@@ -32,9 +61,9 @@ tags:
 colorID: 0
 position: 0, 400
 ---
-Bob: So how are you really?
+Narrator: So how are you really?
-Theresa: I'm good!
+You: I'm good!
-Bob: Do you want to continue talking?
+Narrator: Do you want to continue talking?
 -> Yes
     [[Start]]
 -> No

project.godot

@@ -9,30 +9,12 @@
 config_version=4
 
 _global_script_classes=[ {
-"base": "Object",
-"class": "Compiler",
-"language": "GDScript",
-"path": "res://addons/Wol/core/compiler/Compiler.gd"
-}, {
-"base": "Object",
-"class": "Lexer",
-"language": "GDScript",
-"path": "res://addons/Wol/core/compiler/Lexer.gd"
-}, {
-"base": "Object",
-"class": "Program",
-"language": "GDScript",
-"path": "res://addons/Wol/core/Program.gd"
-}, {
 "base": "Node",
 "class": "Wol",
 "language": "GDScript",
 "path": "res://addons/Wol/Wol.gd"
 } ]
 _global_script_class_icons={
-"Compiler": "",
-"Lexer": "",
-"Program": "",
 "Wol": ""
 }