From ab2f19e0279c2123688f33b54f8e9f95be9c1734 Mon Sep 17 00:00:00 2001
From: Kagura <me@kagurach.uk>
Date: Mon, 17 Jun 2024 13:06:46 +0800
Subject: [PATCH] Remove Unused Variables

---
 LL1/src/AnalyzeTable.kt | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/LL1/src/AnalyzeTable.kt b/LL1/src/AnalyzeTable.kt
index 796271d..f22ef5b 100644
--- a/LL1/src/AnalyzeTable.kt
+++ b/LL1/src/AnalyzeTable.kt
@@ -5,7 +5,6 @@ class AnalyzeTable {
     var table = mutableMapOf<String, Int>() // k = E,i; v = 1
     var items = mutableListOf<String>()     // 文法
 
-    var first = mutableMapOf<String, MutableList<String>>() // First(E)
     var start = "" // 开始符号
 
     companion object {
@@ -19,14 +18,15 @@ class AnalyzeTable {
         T  -> FT'
         T' ::= *FT'|ε
         F  -> (E)|i
-    """.trimIndent())
+    """.trimIndent()
+    )
 
     constructor(lang: String, _s: String? = null) {
-        start = _s?:lang.trim()[0].toString()
+        start = _s ?: lang.trim()[0].toString()
 
-        val lang = if ("::=" in lang){ // 换成一个符号方便
-            lang.replace("::=","->")
-        }else{
+        val lang = if ("::=" in lang) { // 换成一个符号方便
+            lang.replace("::=", "->")
+        } else {
             lang
         }
 
@@ -70,7 +70,7 @@ class AnalyzeTable {
             val vn = item.split("->")[0]
             val right = item.split("->")[1]
 
-            val firsts = getFirst(right, vn)
+            val firsts = getFirst(right)
             firsts.forEach {
                 if (it != NULL) {
                     table["$vn,$it"] = items.indexOf(item)
@@ -90,7 +90,7 @@ class AnalyzeTable {
         }
     }
 
-    private fun getFirst(string: String, vn: String): MutableList<String> {
+    private fun getFirst(string: String): MutableList<String> {
         val firsts = mutableListOf<String>()
         // 以NULL开头
         if (string == NULL) {
@@ -101,11 +101,6 @@ class AnalyzeTable {
         // 以终结符开头
         V_t.forEach {
             if (string.startsWith(it)) {
-                if (first[vn] != null) {
-                    first[vn]!!.add(it)
-                } else {
-                    first[vn] = mutableListOf(it)
-                }
                 if (!firsts.contains(it)) {
                     firsts.add(it)
                 }
@@ -125,7 +120,7 @@ class AnalyzeTable {
                 for (line in items) {
                     if (line.split("->")[0] == item) {
                         val newLine = line.split("->")[1]
-                        val nextFirst = getFirst(newLine, item) // 求 item的follow
+                        val nextFirst = getFirst(newLine) // 求 item的follow
                         nextFirst.forEach {
                             if (it !in newFirst) {
                                 newFirst.add(it)
@@ -173,7 +168,7 @@ class AnalyzeTable {
                     }
 
                     else -> {
-                        val upFirst = getFirst(split, l)
+                        val upFirst = getFirst(split)
                         upFirst.forEach {
                             if (it != NULL) {
                                 follows.add(it)
@@ -312,5 +307,5 @@ class AnalyzeTable {
         }
     }
 
-    class UnknownSymbolException(msg: String) : Exception("\n"+msg)
+    class UnknownSymbolException(msg: String) : Exception("\n" + msg)
 }
\ No newline at end of file