添加项目文件。

CompilerDesignIflr1/CompilerDesignIflr1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

CompilerDesignIflr1/GrammarReader.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CompilerDesignIFlr1
+{
+    internal class GrammarReader
+    {
+        public GrammarReader(Uri grammarFilePath) 
+        {
+
+        }
+    }
+}

CompilerDesignIflr1/LR1Closure.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CompilerDesignIFlr1
+{
+    internal class LR1Closure
+    {
+    }
+}

CompilerDesignIflr1/LR1Unit.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CompilerDesignIFlr1
+{
+    internal class LR1Unit
+    {
+        public LR1Unit() { }
+    }
+}

CompilerDesignIflr1/LexicalAnalysis.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CompilerDesignIflr1
+{
+    internal class LexicalAnalysis
+    {
+        string Text { get; set; } = "";
+
+
+    }
+}

CompilerDesignIflr1/Program.cs

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+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

CompilerDesignIflr1/if-grammar.grammar

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+@top Program {
+  StatementList
+}
+
+StatementList {
+  Statement*
+}
+
+@skip { Whitespace }
+
+IfStatement {
+  If LParen ConditionalExpression RParen PartIfStatement Else Statement | If LParen ConditionalExpression RParen Statement
+}
+
+PartIfStatement {
+  If LParen ConditionalExpression RParen PartIfStatement Else PartIfStatement | NoIfStatement
+}
+
+ConditionalExpression {
+  Expression Operator Expression | Expression
+}
+
+Expression {
+  Term (AddLike Term)*
+}
+
+Statement {
+  IfStatement | NoIfStatement
+}
+
+NoIfStatement {
+  AssignmentStatement Semicolon | VariableDefinition Semicolon | LBrace Statement* RBrace | ConstantDefinition Semicolon
+}
+
+AssignmentStatement {
+  Identifier Equal Expression
+}
+
+Term {
+  Factor (MultiplyLike Factor)*
+}
+
+VariableDefinition {
+  Type (Identifier | Identifier Equal Expression)+
+}
+
+ConstantDefinition {
+  Const VariableDefinition
+}
+
+Type {
+  Int | Char
+}
+
+Factor {
+  Identifier | Number | Character | LParen Expression RParen
+}
+
+AddLike {
+  Plus | Minus
+}
+
+MultiplyLike {
+  Multiply | Divide | Modulo
+}
+
+Number {
+  UnsignedNumber | Minus UnsignedNumber | Plus UnsignedNumber
+}
+@tokens {
+  If { "!if" }
+  Else { "!else" }
+  Int {"!int"}
+  Char {"!char"}
+  Const { "!const" }
+  Plus { "+" }
+  Minus { "-" }
+  Multiply { "*" }
+  Modulo { "%" }
+  Divide { "/" }
+  LParen { "(" }
+  RParen { ")" }
+  LBrace { "{" }
+  RBrace { "}" }
+  Semicolon { ";" }
+  Identifier { $[a-zA-Z_]$[a-zA-Z0-9_]* } 
+  UnsignedNumber { $[0-9]+ }
+  String { "\"" $[\x00-\x7F]* "\"" }
+  Character { "'" $[\x00-\x7F] "'" }
+  Operator { "==" | "!=" | "<=" | ">=" | "<" | ">" }
+  Equal { "=" }
+  Whitespace { $[\t\n\r]+ }
+}