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EOI: Lecture 10 & 11 complete.
This commit is contained in:
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@ -42,17 +42,27 @@ margin_bottom = -2.0
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[node name="Eva_Interpret_Btn" type="Button" parent="VBox"]
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margin_right = 203.0
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margin_bottom = 30.0
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margin_bottom = 27.0
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rect_pivot_offset = Vector2( -123, -302 )
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size_flags_vertical = 3
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size_flags_stretch_ratio = 0.08
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theme = ExtResource( 1 )
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text = "Eva: Interpret"
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[node name="ClearOutput_Btn" type="Button" parent="VBox"]
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margin_top = 34.0
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[node name="Eva_ResetEnv_Btn" type="Button" parent="VBox"]
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margin_top = 31.0
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margin_right = 203.0
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margin_bottom = 64.0
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margin_bottom = 59.0
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rect_pivot_offset = Vector2( -123, -302 )
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size_flags_vertical = 3
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size_flags_stretch_ratio = 0.08
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theme = ExtResource( 1 )
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text = "Eva: Reset Enviornment"
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[node name="ClearOutput_Btn" type="Button" parent="VBox"]
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margin_top = 63.0
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margin_right = 203.0
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margin_bottom = 91.0
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rect_pivot_offset = Vector2( -123, -302 )
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size_flags_vertical = 3
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size_flags_stretch_ratio = 0.08
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@ -61,14 +71,14 @@ text = "Clear Output"
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[node name="Separator" type="HSeparator" parent="VBox"]
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modulate = Color( 0.145098, 0.145098, 0.164706, 0 )
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margin_top = 68.0
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margin_top = 95.0
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margin_right = 203.0
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margin_bottom = 443.0
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margin_bottom = 445.0
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size_flags_vertical = 15
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theme = ExtResource( 5 )
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[node name="Back_Btn" type="Button" parent="VBox"]
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margin_top = 447.0
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margin_top = 449.0
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margin_right = 203.0
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margin_bottom = 478.0
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rect_pivot_offset = Vector2( -123, -302 )
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@ -17,6 +17,7 @@ onready var Editor = get_node("Editor_TEdit")
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onready var Output = get_node("Output_TEdit")
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onready var Debug = get_node("Debug_TEdit")
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onready var Eva_Btn = get_node("VBox/Eva_Interpret_Btn")
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onready var Eva_Reset_Btn = get_node("VBox/Eva_ResetEnv_Btn")
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onready var Clear_Btn = get_node("VBox/ClearOutput_Btn")
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onready var Back_Btn = get_node("VBox/Back_Btn")
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@ -24,7 +25,6 @@ onready var Back_Btn = get_node("VBox/Back_Btn")
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func evaBtn_pressed():
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Lexer = SLexer.new(Editor.text, Output)
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Parser = SParser.new(Lexer, Output)
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Eva = SEva.new(null, Output)
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var ast = Parser.parse()
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var result = Eva.eval(ast)
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@ -34,6 +34,10 @@ func evaBtn_pressed():
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Debug.text = JSON.print( Eva.get_EnvSnapshot(), "\t" )
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func evaResetBtn_pressed():
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Eva = SEva.new(null, Output)
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Debug.text = JSON.print( Eva.get_EnvSnapshot(), "\t" )
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func clearBtn_pressed():
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Output.text = ""
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@ -42,6 +46,10 @@ func backBtn_pressed():
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func _ready():
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Eva = SEva.new(null, Output)
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Debug.text = JSON.print( Eva.get_EnvSnapshot(), "\t" )
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Eva_Btn.connect("pressed", self, "evaBtn_pressed")
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Eva_Reset_Btn.connect("pressed", self, "evaResetBtn_pressed")
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Clear_Btn.connect("pressed", self, "clearBtn_pressed")
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Back_Btn.connect("pressed", self, "backBtn_pressed")
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@ -25,11 +25,17 @@ var Env : EvaEnv
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var Parent
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# ---------------------------------------------------------- GLOBALS END
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func get_class():
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return "Eva"
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func _init(parent, evalOut):
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EvalOut = evalOut
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Env = EvaEnv.new(EvalOut)
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Parent = parent
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if Parent == null:
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Env.setup_Globals()
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func eval( ast ):
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match ast.type():
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NType.program :
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@ -66,32 +72,33 @@ func eval( ast ):
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return result
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NType.fn_User :
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var symbol = ast.arg(1)
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var fnDef = \
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[
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ast.arg(2), # Parameters
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ast.arg(3), # Body
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self # Closure (Environment capture)
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]
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Env.define(symbol, fnDef)
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return Env.lookup(symbol)
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NType.identifier :
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var identifier = ast.arg(1)
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if Parent != null && !Env.has( identifier):
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return Parent.Env.lookup( identifier )
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return Env.lookup( identifier )
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return eval_Lookup( ast )
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NType.op_Assign :
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var symbol = ast.arg(1)
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var value = eval( ast.arg(2) )
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return eval_Assign( ast )
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if Parent != null && !Env.has( symbol):
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return Parent.Env.set( symbol, value )
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return Env.set( symbol, value )
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NType.op_Fn:
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return eval_Func( ast )
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NType.op_Greater:
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return eval( ast.arg(1) ) > eval( ast.arg(2) )
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NType.op_Lesser:
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return eval( ast.arg(1) ) < eval( ast.arg(2) )
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NType.op_GreaterEqual:
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return eval( ast.arg(1) ) >= eval( ast.arg(2) )
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NType.op_LesserEqual:
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return eval( ast.arg(1) ) <= eval( ast.arg(2) )
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@ -100,10 +107,14 @@ func eval( ast ):
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NType.variable :
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var symbol = ast.arg(1)
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var value = eval( ast.arg(2) )
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var value
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Env.define_Var(symbol, value)
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return value
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if ast.num_args() == 2:
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value = eval( ast.arg(2) )
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Env.define(symbol, value)
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return Env.lookup(symbol)
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if ast.is_Number() :
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return float( ast.arg(1) )
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@ -125,6 +136,44 @@ func eval_Block( ast ):
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return result
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func eval_Lookup( ast ) :
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var identifier = ast.arg(1)
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if Parent != null && !Env.has( identifier):
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return Parent.eval_Lookup( ast )
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return Env.lookup( identifier )
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func eval_Assign( ast, oriEva = null ) :
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var symbol = ast.arg(1)
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if Parent != null && !Env.has( symbol):
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return Parent.eval_Assign( ast, self )
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var value
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if oriEva != null :
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value = oriEva.eval( ast.arg(2) )
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else :
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value = eval( ast.arg(2) )
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return Env.set( symbol, value )
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func eval_Func( ast ):
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var fn = eval_Lookup( ast )
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var params = fn[0]
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var body = fn[1]
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var fnEva = get_script().new( fn[2], EvalOut )
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if params.type() != NType.empty:
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var index = 1
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while index <= params.num_args():
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var paramVal = eval( ast.arg(index + 1) )
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fnEva.Env.define(params.arg(index), paramVal )
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index += 1
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return fnEva.eval( body )
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func eval_Numeric( ast ):
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if ast.type() == NType.op_Add:
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var result = 0.0; var index = 1
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@ -136,6 +185,9 @@ func eval_Numeric( ast ):
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return result
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if ast.type() == NType.op_Sub:
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if ast.num_args() == 2:
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return -eval( ast.arg(1) )
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var result = 0.0; var index = 1
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while index <= ast.num_args():
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@ -171,9 +223,11 @@ func eval_Print( ast ):
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return null
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func get_EnvSnapshot():
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var snapshot = Env.Records.duplicate(true)
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var \
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snapshot = EvaEnv.new(EvalOut)
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snapshot.Records = Env.Records.duplicate(true)
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if Parent != null:
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snapshot[Parent] = Parent.Env.Records.duplicate(true)
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snapshot[Parent] = Parent.get_EnvSnapshot()
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return snapshot
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return snapshot.to_Dictionary()
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@ -19,15 +19,17 @@ class_name EvaEnv
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var Records : Dictionary
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func _init(errorOut):
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ErrorOut = errorOut
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func define_Var(symbol : String, value) :
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func define(symbol : String, value) :
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Records[symbol] = value
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func has(symbol : String) :
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return Records.has(symbol)
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func lookup(symbol : String) :
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check(Records.has(symbol), String("Symbol not found in environment records"))
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return Records[symbol]
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func set(symbol : String, value) :
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check(Records.has(symbol), String("Symbol not found in environment records"))
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@ -35,7 +37,83 @@ func set(symbol : String, value) :
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return Records[symbol]
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func lookup(symbol : String) :
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check(Records.has(symbol), String("Symbol not found in environment records"))
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func setup_Globals():
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Records["null"] = null
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Records["true"] = true
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Records["false"] = false
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return Records[symbol]
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func _init(errorOut):
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ErrorOut = errorOut
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# Serialization ----------------------------------------------------
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var SEva
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func array_Serialize(array, fn_objSerializer) :
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var result = []
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for entry in array :
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if typeof(entry) == TYPE_ARRAY :
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result.append( array_Serialize( entry, fn_objSerializer ))
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elif typeof(entry) == TYPE_OBJECT :
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if entry.get_class() == "Eva":
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result.append(entry)
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else:
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fn_objSerializer.set_instance(entry)
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result.append( fn_objSerializer.call_func() )
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else :
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result.append( entry )
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return result
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func to_SExpression():
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var expression = []
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for key in Records.keys() :
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var entry = [key]
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var Value = Records[key]
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if typeof( Value ) == TYPE_ARRAY :
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var \
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to_SExpression_Fn = FuncRef.new()
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to_SExpression_Fn.set_function("to_SExpression")
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var array = array_Serialize( Value, to_SExpression_Fn )
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entry.append(array)
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elif typeof( Value ) == TYPE_OBJECT :
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entry.append( Value.to_SExpression() )
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else :
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entry.append(Value)
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expression.append(entry)
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return expression
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func to_Dictionary():
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var result = {}
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for key in Records.keys() :
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var Value = Records[key]
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if typeof(Value) == TYPE_ARRAY :
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var \
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to_SExpression_Fn = FuncRef.new()
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to_SExpression_Fn.set_function("to_SExpression")
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var array = array_Serialize( Value, to_SExpression_Fn )
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result[key] = array
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elif typeof(Value) == TYPE_OBJECT :
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result[key] = Value.to_SExpression()
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else :
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result[key] = Value
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return result
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# Serialization END -------------------------------------------------
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@ -24,12 +24,13 @@ const TType : Dictionary = \
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cmt_SL = "Comment Single-Line",
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cmt_ML = "Comment Multi-Line",
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def_Block = "Expression Block Start",
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def_Start = "Expression Start",
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def_End = "Expression End",
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def_Block = "Expression Block Start",
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def_Cond = "Expression Conditional",
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def_While = "Expression While",
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def_Var = "Variable Declaration",
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def_Func = "Function Declaration",
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literal_Number = "Literal: Number",
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literal_String = "Literal: String",
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@ -50,12 +51,13 @@ const Spec : Dictionary = \
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TType.fmt_S : "start whitespace.repeat(1-).lazy",
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TType.def_Block : "start \"begin\"",
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TType.def_Start : "start \\(",
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TType.def_End : "start \\)",
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TType.def_Block : "start \"begin\"",
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TType.def_Cond : "start \"if\"",
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TType.def_While : "start \"while\"",
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TType.def_Var : "start \"var\"",
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TType.def_Func : "start \"def\"",
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TType.literal_Number : \
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"""start
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@ -21,6 +21,8 @@ const NType = \
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{
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program = "Program",
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empty = "Empty",
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block = "Scope Block",
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conditional = "Conditional",
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@ -30,6 +32,7 @@ const NType = \
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literal_String = "Literal: String",
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op_Assign = "Assignment",
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op_Fn = "Function Call",
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op_Add = "+",
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op_Sub = "-",
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@ -42,6 +45,8 @@ const NType = \
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op_LesserEqual = "<=",
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fn_Print = "Print",
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fn_User = "User Function",
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fn_Params = "Function Parameters",
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identifier = "Identifier",
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variable = "Variable"
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@ -163,6 +168,8 @@ func parse_Expression():
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node = parse_While()
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TType.def_Var:
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node = parse_Variable()
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TType.def_Func:
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node = parse_fn_User()
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TType.fn_Print:
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node = parse_fn_Print()
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TType.op_Assgin:
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@ -171,7 +178,8 @@ func parse_Expression():
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node = parse_op_Numeric()
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TType.op_Relational:
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node = parse_op_Relational()
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TType.identifier:
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node = parse_op_Fn()
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var arg = 1
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while NextToken.Type != TType.def_End:
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@ -184,6 +192,10 @@ func parse_Expression():
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eat(TType.def_End)
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if node == null:
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node = ASTNode.new()
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node.set_Type(NType.empty)
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return node
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func parse_Block():
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@ -222,11 +234,40 @@ func parse_Variable():
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node.add_TokenValue( NextToken )
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eat(TType.identifier)
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if NextToken.Type == TType.def_Start :
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node.add_Expr( parse_Expression() )
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return node
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else :
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node.add_Expr( parse_Literal() )
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func parse_fn_User():
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var \
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node = ASTNode.new()
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node.set_Type(NType.fn_User)
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eat(TType.def_Func)
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check( NextToken.Type == TType.identifier,
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String("Parser - parse_op_Assign: NextToken should have been identifier, Type: {type} Value: {value}") \
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.format({"type" : NextToken.Type, "value" : NextToken.Value })
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)
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node.add_TokenValue( NextToken )
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eat(TType.identifier)
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# Parameters
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var \
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pNode = ASTNode.new()
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pNode.set_Type(NType.fn_Params)
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eat(TType.def_Start)
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while NextToken.Type != TType.def_End:
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check( NextToken.Type == TType.identifier,
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String("Parser - parse_op_Assign: NextToken should have been identifier, Type: {type} Value: {value}") \
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.format({"type" : NextToken.Type, "value" : NextToken.Value })
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)
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pNode.add_TokenValue(NextToken)
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eat(TType.identifier)
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eat(TType.def_End)
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node.add_Expr( pNode )
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return node
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@ -306,6 +347,15 @@ func parse_op_Relational():
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return node
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func parse_op_Fn():
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var \
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node = ASTNode.new()
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node.set_Type(NType.op_Fn)
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node.add_TokenValue( NextToken )
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eat(TType.identifier)
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return node
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func parse_Literal():
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var node = ASTNode.new()
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