init

lib/filter.js

@@ -0,0 +1,75 @@
+const replaceStrFormIndexArr=require("../utils").replaceStrFormIndexArr;
+
+function filterComments(sql) {
+    let tmpArr = [];
+    const comments = [];
+
+    for (let i = 0; i < sql.length; i++) {
+        let char = sql[i];
+
+        //读取字符
+        if (char == "'" || char == "\"" || char == "-" || char == "\n") {
+            //推入数组
+            tmpArr.push({
+                index: i,
+                char: char
+            });
+        }
+        //校验数组是否有匹配语法
+        if (tmpArr.length < 2) {
+            if (tmpArr[0] && tmpArr[0].char == "\n") {
+                tmpArr = [];
+            }
+            continue;
+        }
+
+        let firstChar = tmpArr[0];
+        let lastChar = tmpArr[tmpArr.length - 1];
+
+        if (firstChar.char == "'" || firstChar.char == "\"") {
+            //引号匹配，则清空
+            if (lastChar.char == firstChar.char) {
+                tmpArr = [];
+                continue;
+            }
+        } else if (firstChar.char == "-") {
+            //假如第一个是横线，则开始校验注释规则
+
+            //判断是否为两个注释符号，不是，则清空
+            if (tmpArr[1].char != "-") {
+                tmpArr = [];
+                continue;
+            }
+            //为注释作用域，遇到换行符，则结束注释
+            else if (lastChar.char == "\n") {
+                comments.push({
+                    begin: firstChar.index,
+                    end: lastChar.index
+                })
+                tmpArr = [];
+                continue;
+            }
+            //解析结束
+            else if (i == sql.length - 1) {
+                comments.push({
+                    begin: firstChar.index,
+                    end: i
+                })
+                continue;
+            }
+        } else {
+            tmpArr = [];
+        }
+    }
+
+    sql = replaceStrFormIndexArr(sql, '', comments)
+
+    return sql;
+}
+
+function cleanSql(sql){
+    return filterComments(sql).trim();
+}
+
+exports.filterComments=filterComments;
+exports.cleanSql=cleanSql;

lib/parser.js

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+const Parser = require('../core/astParser');
+const Cache = require("../core/cache");
+const filter = require("./filter");
+
+
+const astCache=new Cache();
+
+function parse(sql){
+    const cleanSql=filter.cleanSql(sql);
+    console.log(cleanSql)
+    let ast=astCache.get(cleanSql);
+    if(ast){
+        return ast
+    }else{
+        ast=Parser.parse(cleanSql).ast;
+        astCache.set(cleanSql,ast);
+        return ast;
+    }
+}
+
+
+exports.parse=parse;