Fix NBTParser and command transformer bugs

NBTParser.js

@@ -0,0 +1,162 @@
+// Author: wifi_left
+// 灵感来源自：https://zhuanlan.zhihu.com/p/107344979
+function NBTParser(str) {
+    let i = 0;
+    function parseValue() {
+        skipWhitespace();
+        if (str[i] == '[') {
+            // Array
+            return parseArray();
+        } else if (str[i] == '{') {
+            // Array
+            return parseObject();
+        } else {
+            return parseString();
+        }
+    }
+    function skipWhitespace() {
+        while (str[i] == ' ' || str[i] == '\n' || str[i] == '\r') i++;
+    }
+    function eatComma() {
+        if (str[i] !== ',') {
+            throw new SyntaxError('Expected "," but only found "' + str[i] + '" at ' + i);
+        }
+        i++;
+    }
+    function eatColon() {
+        if (str[i] !== ':') {
+            throw new SyntaxError('Expected ":" but only found "' + str[i] + '" at ' + i);
+        }
+        i++;
+    }
+    function parseString() {
+        let escapeLock = false; // '\'
+        let topElement = -1; // -1 for none, 0 for "", 1 for ''
+        let StringBuffer = "";
+        while (true) {
+            if (topElement == -1) {
+                if (str[i] === '}' || str[i] === ']' || str[i] === ',' || str[i] === ':') {
+                    break;
+                }
+                if (i >= str.length) {
+                    throw new SyntaxError('Unexpected ends of string.');
+                }
+                if (str[i] == '"') {
+                    if (StringBuffer !== "") {
+                        throw new SyntaxError("Unexpected '\"' at " + i);
+                    }
+                    topElement = 0;
+                } else if (str[i] == '\'') {
+                    if (StringBuffer !== "") {
+                        throw new SyntaxError("Unexpected \"'\" at " + i);
+                    }
+                    topElement = 1;
+                }
+                StringBuffer = StringBuffer + str[i];
+
+            } else if (topElement == 0) {
+                if (str[i] == '"' && !escapeLock) {
+                    StringBuffer = StringBuffer + str[i];
+                    i++;
+                    return StringBuffer;
+                }
+                if (escapeLock) {
+                    escapeLock = false;
+                } else if (str[i] == '\\') {
+                    escapeLock = true;
+                }
+                StringBuffer = StringBuffer + str[i];
+
+            } else if (topElement == 1) {
+                if (str[i] == '\'' && !escapeLock) {
+                    StringBuffer = StringBuffer + str[i];
+                    i++;
+                    return StringBuffer;
+                }
+                if (escapeLock) {
+                    escapeLock = false;
+                } else if (str[i] == '\\') {
+                    escapeLock = true;
+                }
+                StringBuffer = StringBuffer + str[i];
+
+            }
+            i++;
+        }
+        return StringBuffer;
+    }
+    function parseObject() {
+        if (str[i] === '{') {
+            i++;
+            skipWhitespace();
+
+            // if it is not '}',
+            // we take the path of string -> whitespace -> ':' -> value -> ...
+            let initial = true;
+            // if it is not '}',
+            let map = {}
+            // we take the path of string -> whitespace -> ':' -> value -> ...
+            while (str[i] !== '}') {
+                if (i >= str.length) {
+                    throw new SyntaxError("Expected '}' at " + i + " (End)");
+                }
+                if (!initial) {
+                    eatComma();
+                    skipWhitespace();
+                }
+                const key = parseString();
+                if (key === "" && str[i] === '}') break;
+                skipWhitespace();
+                eatColon();
+                const value = parseValue();
+                if (value === "") {
+                    throw new SyntaxError("Unexpected: value of key '" + key + "' is null.");
+                }
+                initial = false;
+                map[key] = value;
+            }
+            // move to the next character of '}'
+            i++;
+            return map;
+        }
+    }
+    function parseArray() {
+        if (str[i] === '[') {
+            i++;
+            skipWhitespace();
+
+            // if it is not '}',
+            // we take the path of string -> whitespace -> ':' -> value -> ...
+            let initial = true;
+            // if it is not '}',
+            let map = []
+            // we take the path of string -> whitespace -> ':' -> value -> ...
+            while (str[i] !== ']') {
+                if (i >= str.length) {
+                    throw new SyntaxError("Expected ']' at " + i + " (End)");
+                }
+                if (!initial) {
+                    eatComma();
+                    skipWhitespace();
+                }
+                const value = parseValue();
+                skipWhitespace();
+
+                initial = false;
+                if (value === "") continue;
+                map.push(value);
+            }
+            // move to the next character of '}'
+            i++;
+            return map;
+        }
+    }
+    if (str[i] === '{') {
+        return parseObject();
+    } else if (str[i] === '[') {
+        return parseArray();
+    } else {
+        return JSON.parse(str);
+    }
+}
+module.exports = { NBTParser }