fix rakugoteam#262

Test/TestParser/TestVariables/TestVariables.gd

@@ -13,16 +13,16 @@ func test_variables():
 
 	assert_variable("a", TYPE_INT, 1)
 
-	assert_variable("b", TYPE_FLOAT, 2.5)
+	assert_variable("b", TYPE_FLOAT, 3.5)
 
 	assert_variable("c", TYPE_STRING, "Hello, world !")
 
-	assert_variable("d", TYPE_INT, Rakugo.get_variable("a"))
+	assert_variable("d", TYPE_INT, -1)
 
 	assert_variable("Sy.name", TYPE_STRING, "Sylvie")
 
-	assert_variable("Sy.life", TYPE_INT, 5)
-
 	assert_variable("e", TYPE_INT, Rakugo.get_variable("Sy.life"))
+
+	assert_variable("Sy.life", TYPE_INT, 10)
 
 	assert_eq(Rakugo.get_variable("f"), null)

Test/TestParser/TestVariables/TestVariables.rk

@@ -1,7 +1,12 @@
 a = 1
 b = 2.5
-c = "Hello, world !"
+c = "Hello,"
 d = a
 character Sy "Sylvie"
 Sy.life = 5
-e = Sy.life
+a /= 1
+b += 1
+c += " world !"
+d -= 2
+Sy.life *= 2
+e = Sy.life

addons/Rakugo/lib/systems/Executer.gd

@@ -269,7 +269,37 @@ func do_execute_script(parameters:Dictionary):
 					else:
 						value = float(value)
 
-				Rakugo.set_variable(result["lvar_name"], value)
+				var assignment = result["assignment"]
+
+				var lvar_name = result["lvar_name"]
+
+				if assignment != "=":
+					var lvalue = Rakugo.get_variable(lvar_name)
+
+					if lvalue == null:
+						parameters["error"] = "Executer::do_execute_script::SET_VARIABLE, Rakugo does not knew a variable called: " + lvar_name
+						parameters["stop"] = true
+						break
+
+					match(assignment):
+						"+=":
+							value = lvalue + value
+
+						"-=":
+							value = lvalue - value
+
+						"*=":
+							value = lvalue * value
+
+						"/=":
+							value = lvalue / value
+
+						_:
+							parameters["error"] = "Executer::do_execute_script::SET_VARIABLE, the assignment operator is not implemented :" + assignment
+							parameters["stop"] = true
+							break
+
+				Rakugo.set_variable(lvar_name, value)
 			_:
 				var foo = func():
 					Rakugo.sg_custom_regex.emit(line[0], result)

addons/Rakugo/lib/systems/Parser.gd

@@ -41,6 +41,7 @@ var Regex := {
 	NUMERIC = "-?[0-9]\\.?[0-9]*",
 	STRING = "\".+?\"",
 	VARIABLE = "((?<char_tag>{NAME})\\.)?(?<var_name>{NAME})",
+	ASSIGNMENT = "(?<assignment>=|\\+=|\\-=|\\*=|\\/=)"
 #	MULTILINE_STRING = "\"\"\"(?<string>.*)\"\"\"",
 }
 
@@ -65,7 +66,7 @@ var parser_regex :={
 	# jump label
 	JUMP = "^jump (?<label>{NAME})( if (?<expression>.+))?$",
 	# for setting Rakugo variables
-	SET_VARIABLE = "^(?<lvar_name>{VARIABLE}) = ((?<text>{STRING})|(?<number>{NUMERIC})|(?<rvar_name>{VARIABLE}))$",
+	SET_VARIABLE = "^(?<lvar_name>{VARIABLE})\\s*{ASSIGNMENT}\\s*((?<text>{STRING})|(?<number>{NUMERIC})|(?<rvar_name>{VARIABLE}))$",
 	# $ some_gd_script_code
 #	IN_LINE_GDSCRIPT = "^\\$.*",
 	# gdscript:
@@ -267,6 +268,7 @@ func parse_script(lines:PackedStringArray) -> Dictionary:
 					"SET_VARIABLE":
 						var dic_result := {
 							"lvar_name":result.get_string("lvar_name"),
+							"assignment":result.get_string("assignment"),
 							"rvar_name":result.get_string("rvar_name"),
 							"number":result.get_string("number"),
 							"text":treat_string(result.get_string("text"))