Blockly是一个用于生成可视化编程编辑器的库。在代码生成过程中进行子模块的类型检查是一种常见的需求,可以通过以下解决方法来实现:
registerBlockType
方法来注册模块类型,并为每个模块指定所需的输入和输出类型。Blockly.Blocks['math_arithmetic'] = {
init: function() {
this.jsonInit({
"type": "math_arithmetic",
"message0": "%1 %2 %3",
"args0": [
{
"type": "input_value",
"name": "A",
"check": "Number"
},
{
"type": "field_dropdown",
"name": "OP",
"options": [
["+", "ADD"],
["-", "MINUS"],
["*", "MULTIPLY"],
["/", "DIVIDE"]
]
},
{
"type": "input_value",
"name": "B",
"check": "Number"
}
],
"output": "Number",
"colour": 230,
"tooltip": "",
"helpUrl": ""
});
}
};
getFieldValue
方法来获取模块的字段值,使用getValueInput
方法来获取模块的输入值,并使用setCheck
方法来设置模块的输出类型检查。Blockly.JavaScript['math_arithmetic'] = function(block) {
var a = Blockly.JavaScript.valueToCode(block, 'A', Blockly.JavaScript.ORDER_ATOMIC);
var b = Blockly.JavaScript.valueToCode(block, 'B', Blockly.JavaScript.ORDER_ATOMIC);
var operator = block.getFieldValue('OP');
// 检查输入类型
if (!Blockly.Types.isNumber(a) || !Blockly.Types.isNumber(b)) {
throw new Error('Inputs must be numbers.');
}
// 设置输出类型检查
Blockly.Types[Blockly.Types.NUMBER].setOutput(true);
var code = '';
switch (operator) {
case 'ADD':
code = a + ' + ' + b;
break;
case 'MINUS':
code = a + ' - ' + b;
break;
case 'MULTIPLY':
code = a + ' * ' + b;
break;
case 'DIVIDE':
code = a + ' / ' + b;
break;
}
return [code, Blockly.JavaScript.ORDER_ATOMIC];
};
通过以上方法,可以在Blockly中对子模块进行类型检查,并在代码生成过程中进行相应的处理。