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Date: Sat, 2 Jan 2021 14:59:00 +0000
Subject: [PATCH] =?UTF-8?q?PageSwitch.js=20=E5=A2=9E=E5=8A=A0checkCases2?=
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针对Issue中MikanHako1024提出的条件表达式格式，增加checkCases2方法，试图实现对该格式的条件表达式的提取与处理。
Issues链接：https://github.com/heartcase/WorldEffect/issues/5#issuecomment-752147495
---
 js/plugins/PageSwitch.js | 87 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/js/plugins/PageSwitch.js b/js/plugins/PageSwitch.js
index 0462516..f85f431 100644
--- a/js/plugins/PageSwitch.js
+++ b/js/plugins/PageSwitch.js
@@ -29,6 +29,93 @@ window.PageSwitch = {};
     return true;
   };
 
+  /*
+  2021.1.2 开关关
+  下面的checkCases2方法针对的是写成这样的注释：
+  
+  <conditions>
+  ( A or B ) and C
+  A : SelfData name is "HeartCase"
+  B : SelfData name is "AngelHeartCase"
+  C : GameVariable 5 > 10086
+  </conditions>
+  
+  A、B、C在下面的注释中被称为标记。
+  这段代码尚未测试。
+  */
+  const checkCases2 = (event, page) => {
+    // 第一步：读取注释内容到数组
+    const list = page.list;
+    let started = -1;
+    let arrayExpression = [];
+    for (let i = 0; i < list.length; i++) {
+      if (started == -1) {
+        if(list[i].code == 108 && list[i].parameters[0].search('<conditions>') != -1) {
+          started = i;
+        }
+      } else {
+        if(list[i].code == 400 || 108) {
+          if (list[i].parameters[0].search('</conditions>') != -1) {
+            break;
+          } else {
+            arrayExpression.push(list[i].parameters[0]);
+          }
+        }
+      }
+    }
+    console.log('提取出注释中从<conditions>到</conditions>中间的内容');
+    console.log(arrayExpression);
+    // 以上是第一步
+    // 第二步：计算每一行的结果（每个子条件）并记录
+    const flag = {}; // 记录每行标记的名称和对应的结果 
+    // 翻译每条标记的表达式
+    for (let i = 1; i < arrayExpression.length; i++) {
+      const flagName = arrayExpression[i].split(' : ')[0];
+      const comment = arrayExpression[i].split(' : ')[1];
+      // 下面这段是从checkCases中复制来的
+      for (const key in casePatterns) {
+        const pattern = casePatterns[key];
+        const handler = caseHandlers[key];
+        const match = comment.match(pattern);
+        if (match) {
+          const [_, ...matches] = match;
+          const result = handler(event, ...matches);
+          flag[flagName] = result;
+        }
+      }
+      // 从checkCases中复制来的止于此
+    }
+    console.log('各标记的表达式');
+    console.log(flag);
+    // 以上是第二步
+    // 第三步：翻译总表达式（母条件）
+    let headExpression = arrayExpression[0].split(' ');
+    let headFormula = '';
+    for (let i = 0; i < headExpression.length; i++) {
+      switch headExpression[i] {
+        case '(':
+          headFormula += '( ';
+          break;
+        case ')':
+          headFormula += ') ';
+          break;
+        case 'or':
+          headFormula += '||';
+          break;
+        case 'and':
+          headFormula += '&&';
+          break;
+        default:
+          headFormula += '${flag[' + headExpression[i] + ']} ';
+      }
+    }
+    console.log('总表达式');
+    console.log(headFormula);
+    let headResult = new Function('return ' + '`' + headFormula + '`')();
+    return headResult;
+  };
+  
+  
   const registerCase = (key, pattern, handler) => {
     casePatterns[key] = pattern;
     caseHandlers[key] = handler;