{"id":1631,"date":"2020-02-06T17:51:08","date_gmt":"2020-02-06T09:51:08","guid":{"rendered":"http:\/\/ykyi.net\/?p=1631"},"modified":"2020-02-06T17:51:08","modified_gmt":"2020-02-06T09:51:08","slug":"rust%e8%af%ad%e8%a8%80%e7%9a%84%e5%ae%8f%e7%bc%96%e7%a8%8b%e6%9e%81%e7%ae%80%e6%95%99%e7%a8%8bmacro","status":"publish","type":"post","link":"https:\/\/ykyi.net\/?p=1631","title":{"rendered":"Rust\u8bed\u8a00\u7684\u5b8f\u7f16\u7a0b\u6781\u7b80\u6559\u7a0bMacro"},"content":{"rendered":"<h2>Rust\u7684\u5b8f\u548cc\/c++\u7684\u5f02\u540c<\/h2>\n<p>Rust\u8bed\u8a00\u7684\u5b8f\u8bbe\u8ba1\u5f97\u6bd4\u8f83\u590d\u6742\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u8bf4\u529f\u80fd\u975e\u5e38\u5f3a\u5927\uff0c\u8ddfc\/c++\u8bed\u8a00\u7684\u5b8f\u975e\u5e38\u4e0d\u4e00\u6837\u3002<br \/>\n<strong>\u76f8\u540c\u70b9<\/strong> \u5f53\u7136\u662f\u5b8f\u80fd\u591f\u8ba9\u4ee3\u7801\u66f4\u7cbe\u7b80\uff0c\u7801\u519c\u53ef\u4ee5\u5c11\u6572\u5f88\u591a\u6837\u677f\u4ee3\u7801(boilerplate code)\u3002\u5f53\u7136\u4f60\u8bf4\u51fd\u6570\u548c\u7c7b\u4e0d\u4e5f\u53ef\u4ee5\u62bd\u8c61\u4ee3\u7801\uff0c\u4f7f\u4ee3\u7801\u7cbe\u7b80\u5417\uff1f\u4f46\u5b8f\u80fd\u591f\u83b7\u53d6\u5f88\u591a\u5728\u7f16\u8bd1\u671f\u7684\u4fe1\u606f\uff0c\u51fd\u6570\u548c\u7c7b\u5374\u4e0d\u80fd\u3002\u6bd4\u5982\uff0c\u4ee3\u7801\u6240\u5728\u7684\u6587\u4ef6\u548c\u884c\u6570\uff0c\u8fd9\u4e2a\u4fe1\u606f\u53ea\u6709\u5b8f\u624d\u80fd\u83b7\u5f97\u3002<br \/>\n<strong>\u4e0d\u540c\u70b9<\/strong> \u662f\uff0cC\/C++\u7684\u5b8f\u53ea\u662f\u5728\u9884\u7f16\u8bd1\u671f\u7b80\u5355\u5730\u505a\u6a21\u5f0f\u66ff\u6362\uff0c\u9884\u7f16\u8bd1\u540e\u518d\u4ea4\u7531\u7f16\u8bd1\u5668\u3002c\/c++\u7684include\u5934\u6587\u4ef6\u5c55\u5f00\u4e5f\u662f\u5728\u9884\u7f16\u8bd1\u9636\u6bb5\u3002\u4f46Rust\u5b8f\u7684\u5c55\u5f00\u4e0d\u662f\u53d1\u751f\u5728\u9884\u7f16\u8bd1\u671f\uff0c\u800c\u662f\u7f16\u8bd1\u671f\u3002\u4e8e\u662fRust\u80fd\u591f\u83b7\u5f97\u66f4\u590d\u6742\u7684\u66f4\u8be6\u7ec6\u7684\u7f16\u8bd1\u5668\u7684\u4fe1\u606f\u3002\u8fd9\u91cc\u6709\u4e24\u4e2a\u6982\u5ff5Token Tree\u548cAST\u3002\u5982\u679c\u6709\u5927\u5b66\u9636\u6bb5\u5b66\u4e60\u8fc7\u7684\u7f16\u8bd1\u539f\u7406\u8bfe\u7a0b\u7684\u80cc\u666f\u5c31\u5f88\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<h3>Token Tree<\/h3>\n<p>Token Tree\u7b80\u5199\u6210TT\u3002\u7f16\u8bd1\u5668\u62ff\u5230\u6e90\u4ee3\u7801\u540e\u5148\u505a\u8bcd\u6cd5\u5206\u6790\uff0c\u5373\u628a\u6e90\u4ee3\u7801\u5b57\u8282\u6d41\u5206\u6210\u4e00\u4e2a\u4e00\u4e2a\u7684token\u3002token\u548ctoken\u4e4b\u95f4\u7684\u903b\u8f91\u5173\u7cfb\u4e5f\u8bb0\u5f55\u4e0b\u6765\u3002\u6bd4\u5982\u4e0b\u9762\u7684\u4e00\u4e2a\u7b80\u5355\u8bed\u53e5\uff1a<\/p>\n<pre><code class=\"language-rust \">a + b + (c + d[0]) + e\n<\/code><\/pre>\n<p>\u7684Token Tree\u5c31\u957f\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n<pre><code class=\"\">\u00aba\u00bb \u00ab+\u00bb \u00abb\u00bb \u00ab+\u00bb \u00ab(   )\u00bb \u00ab+\u00bb \u00abe\u00bb\n         \u256d\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n          \u00abc\u00bb \u00ab+\u00bb \u00abd\u00bb \u00ab[   ]\u00bb\n                       \u256d\u2500\u2534\u2500\u256e\n                        \u00ab0\u00bb\n<\/code><\/pre>\n<h3>AST<\/h3>\n<p>AST\u7684\u5168\u79f0\u662fAbstract Syntax Tree\uff0c\u62bd\u8c61\u8bed\u6cd5\u6811\u3002\u7f16\u8bd1\u5668\u628aToken Tree\u7ffb\u8bd1\u6210AST\uff0c\u8fd9\u662f\u4e00\u4e2a\u66f4\u6709\u5229\u4e8e\u7f16\u8bd1\u5668\u7406\u89e3\u6e90\u4ee3\u7801\u7684\u7ed3\u6784\u3002\u4e0a\u9762\u7684TT\u7ffb\u8bd1\u6210\u5bf9\u5e94\u7684AST\u540e\u957f\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n<pre><code class=\"\">              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n              \u2502 BinOp   \u2502\n              \u2502 op: Add \u2502\n            \u250c\u2574\u2502 lhs: \u25cc  \u2502\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 \u2502 rhs: \u25cc  \u2502\u2576\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 Var     \u2502\u2576\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2574\u2502 BinOp   \u2502\n\u2502 name: a \u2502                 \u2502 op: Add \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518               \u250c\u2574\u2502 lhs: \u25cc  \u2502\n              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 \u2502 rhs: \u25cc  \u2502\u2576\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n              \u2502 Var     \u2502\u2576\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2574\u2502 BinOp   \u2502\n              \u2502 name: b \u2502                 \u2502 op: Add \u2502\n              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518               \u250c\u2574\u2502 lhs: \u25cc  \u2502\n                            \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 \u2502 rhs: \u25cc  \u2502\u2576\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                            \u2502 BinOp   \u2502\u2576\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2574\u2502 Var     \u2502\n                            \u2502 op: Add \u2502                 \u2502 name: e \u2502\n                          \u250c\u2574\u2502 lhs: \u25cc  \u2502                 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 \u2502 rhs: \u25cc  \u2502\u2576\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n              \u2502 Var     \u2502\u2576\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2574\u2502 Index   \u2502\n              \u2502 name: c \u2502               \u250c\u2574\u2502 arr: \u25cc  \u2502\n              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 \u2502 ind: \u25cc  \u2502\u2576\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                            \u2502 Var     \u2502\u2576\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2574\u2502 LitInt  \u2502\n                            \u2502 name: d \u2502                 \u2502 val: 0  \u2502\n                            \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\n<\/code><\/pre>\n<p>AST\u56fe\u6709\u6392\u7248\u6709\u70b9\u4e71\uff0c\u6211\u61d2\u5f97\u6539\u4e86\u3002\u8fd9\u4e24\u4eba\u4e2a\u56fe\uff0cTT\u548cAST\u90fd\u662f\u4ece https:\/\/danielkeep.github.io\/tlborm\/book\/mbe-syn-source-analysis.html \u6284\u6765\u7684\u3002\u60a8\u53ef\u4ee5\u79fb\u6b65\u5230\u90a3\u4e2a\u9875\u9762\u3002<br \/>\n\u91cd\u70b9\u6765\u4e86\uff0cRust\u8bed\u8a00\u7684\u5b8f\u5c55\u5f00\u5c31\u53d1\u751f\u5728\u7f16\u8bd1\u5668\u751f\u6210\u4e86\u6e90\u4ee3\u7801\u7684AST\u7684\u65f6\u5019\u3002Rust\u8bed\u8a00\u7684\u5b8f\u53ef\u4ee5\u4eceAST\u83b7\u5f97\u975e\u5e38\u4e30\u5bcc\u7684\u4fe1\u606f\uff0c\u5e76\u64cd\u4f5cAST\u3002<\/p>\n<h2>Rust\u7684\u5b8f\u6709\u4e24\u79cd<\/h2>\n<p>Rust\u8bed\u8a00\u8bbe\u8ba1\u4e86\u4e24\u79cd\u5b8f\uff0c\u4e00\u79cd\u53ebDeclarative Macros\uff08\u58f0\u660e\u5f0f\u5b8f\uff09\uff0c\u4ee5\u524d\u7684\u7248\u672c\u4e5f\u6709Macros by example\u8fd9\u4e2a\u540d\u5b57\uff0c\u65e7\u7684\u540d\u5b57\u602a\u602a\u7684\u3002\u53e6\u4e00\u79cd\u662fProcedure Macros(\u8fc7\u7a0b\u5b8f)\u6211\u4e0d\u660e\u767d\u4e3a\u4ec0\u4e48\u53d6\u8fd9\u4e2a\u540d\u5b57\u3002Declarative Macro\u76f8\u5bf9Procedure Macros\u8981\u7b80\u5355\u4e00\u4e9b\uff0c\u800c\u8fc7\u7a0b\u5b8f\u5219\u53ef\u4ee5\u73a9\u51fa\u53e6\u590d\u6742\u7684\u82b1\u6837\u3002<\/p>\n<h3>Declarative Macro<\/h3>\n<p>\u5e38\u89c1\u7684\u8fd9\u6837\u4e00\u4e2a\u5b9a\u4e49vector\u7684Rust\u8bed\u53e5\uff1a<\/p>\n<pre><code class=\"language-rust \">let v: Vec&lt;u32&gt; = vec![1, 2, 3];\n<\/code><\/pre>\n<p>\u5c31\u4f7f\u7528\u4e86\u58f0\u660e\u5f0f\u5b8f\u3002\u8fd9\u4e2a\u5b8f\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-rust \">#[macro_export]\nmacro_rules! vec {\n    ( <span class=\"katex math inline\">(<\/span>x:expr ),* ) =&gt; {\n        {\n            let mut temp_vec = Vec::new();\n            <span class=\"katex math inline\">(\n                temp_vec.push(<\/span>x);\n            )*\n            temp_vec\n        }\n    };\n}\n<\/code><\/pre>\n<p>#[macro_export]\u8868\u793a\u5c06\u5b9a\u4e49\u7684\u5b8f\u5c06\u5bfc\u51facrate\uff0c\u8fd9\u6837\u4e0d\u4ec5\u5728\u5b9a\u4e49\u4e86\u8fd9\u4e2amacro\u7684crate\u7684\u5185\u90e8\u53ef\u4ee5\u4f7f\u7528\u8be5\u5b8f\uff0c\u5bfc\u5165\u8be5crate\u7684\u5176\u5b83crate\u4ea6\u53ef\u4f7f\u7528\u8fd9\u4e2a\u5b8f\u3002<br \/>\n\u7136\u540e\u770b\u8fd9\u4e2a\u58f0\u660e\u5b8f\u7684\u5b9a\u4e49\uff0c\u975e\u5e38\u50cfrust\u8bed\u4e2d\u7684\u5339\u914d\u8868\u8fbe\u5f0f(match expression)\u3002<span class=\"katex math inline\">(x:expr)<\/span>()* \u8bed\u6cd5\u8868\uff0c\u8868\u793a\u5c55\u5f00\u4e3a0\u6761\u6216\u8005\u591a\u6761\u8868\u8fbe\u5f0f\uff0c\u5176\u4ed6\u7684\u90fd\u6bd4\u8f83\u597d\u7406\u89e3\u3002<br \/>\n\u793a\u5339\u914d\u4e00\u4e2a\u8868\u8fbe\u5f0f\u5e76\u628a\u5339\u914d\u5230\u7684\u8868\u8fbe\u5f0f\u5b58\u5728\u53d8\u91cf<span class=\"katex math inline\">x\u91cc\u3002<\/span>(x:expr)\u88ab<span class=\"katex math inline\">(),* \u5305\u88f9\u3002\u8fd9\u91cc\u6709\u70b9\u50cf\u6b63\u5219\u5f0f\u7684\u63cf\u8ff0\uff0c\u5b83\u8868\u793a\u5339\u914d0\u4e2a\u6216\u8005\u591a\u4e2a\u88ab\u9017\u53f7,\u5206\u9694\u7684\u8868\u8fbe\u5f0f\u3002 =>\u540e\u9762\u7684\u90e8\u5206\u5c31\u662f\u63cf\u8ff0\u600e\u4e48\u5c55\u5f00\u5b8f\u4e86\uff0c\u9664\u4e86\u4e5f\u7528\u5230\u7c7b\u4f3c\u6b63\u5219\u5f0f\u7684<\/span>()* \u8bed\u6cd5\uff0c\u8868\u793a\u5c55\u5f00\u4e3a0\u6761\u6216\u8005\u591a\u6761\u8868\u8fbe\u5f0f\uff0c\u5176\u4ed6\u7684\u90fd\u6bd4\u8f83\u597d\u7406\u89e3\u3002<br \/>\n\u53e6\u5916\uff0c\u8fd9\u4e2a\u5b8f\u7684\u5b9a\u4e49\u53ea\u4f7f\u7528\u4e86\u4e00\u6761\u89c4\u5219\uff0c\u5b9e\u9645\u4e0a\u53ef\u4ee5\u50cf\u5339\u914d\u8868\u8fbe\u5f0f\u4e00\u6837\u5b9a\u4e49\u591a\u4e2a\u89c4\u5219\u3002<\/p>\n<h3>Procedure Macros<\/h3>\n<p>\u8fc7\u7a0b\u5b8f\u53ef\u4ee5\u4e3a\u4e00\u4e2a\u7c7b\u81ea\u52a8\u751f\u6210\u7279\u6027trait\uff08\u7c7b\u4f3cc++\u4e2d\u7684\u7eaf\u865a\u51fd\u6570\uff0cjava\/c#\u4e2d\u7684interface\uff09\u7684\u5b9e\u73b0\uff1b\u8fd8\u80fd\u5b9e\u73b0\u7c7b\u4f3cpython\u4e2d\u7684decoration\u6982\u5ff5\uff0c\u5982\u4e0b\u4ee3\u7801\u6240\u793a\uff1a<\/p>\n<pre><code class=\"\">#[route(GET, \"\/\")]\nfn index() {\n\/\/ ...\n}\n<\/code><\/pre>\n<p>\u8fd9\u5c31\u8ddfpython\u7684http\u6846\u67b6flask\u7528\u6765\u5b9a\u4e49\u8def\u7531\u7684decoration\u7684\u5199\u6cd5\u51e0\u4e4e\u4e00\u6837\u4e86\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u7f16\u5199procedure macros\u9700\u8981\u4f7f\u7528\u4e24\u4e2a\u8f85\u52a9\u7684crate\u7528\u6765\u64cd\u4f5cAST\uff0c\u5b83\u4eec\u662fsync\u548cquote\u3002\u633a\u590d\u6742\u7684\uff0c\u4f60\u4eec\u8fd8\u662f\u53bb\u770b\u5b98\u65b9\u65b9\u6863\u5427\u3002<\/p>\n<h3>hygiene\u662f\u4ec0\u4e48<\/h3>\n<p>\u5728\u8bfb\u5b98\u65b9\u7684Rust Macro\u76f8\u5173\u7684\u8d44\u6599\u65f6\uff0c\u65f6\u4e0d\u65f6\u770b\u5230hygiene\u8fd9\u4e2a\u8a5e\u3002\u4e00\u5f00\u59cb\u4e0d\u61c2\u8fd9\u662f\u4e2a\u4ec0\u4e48\u73a9\u827a\u513f\u3002\u540e\u6765\uff0c\u624d\u77e5\u9053\u539f\u6765\u662frust\u7684\u5b8f\u673a\u5236\u907f\u514d\u4e86c\/c++\u7b80\u5355\u7684\u5b8f\u7ecf\u5e38\u51fa\u73b0\u7684\u526f\u4f5c\u7528\u3002\u5728Rust\u7684\u8bdd\u672f\u91cc\uff0c\u628a\u8fd9\u4e2a\u4e1c\u4e1c\u79f0\u4e3aHygiene\u3002<\/p>\n<p>\u5c31\u5199\u5230\u8fd9\u5427\uff0c\u5199\u6587\u7ae0\u597d\u7d2f\u5440\uff0c\u8fd8\u662f\u5199\u4ee3\u7801\u8f7b\u677e\u6709\u610f\u601d\u4e00\u4e9b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rust\u7684\u5b8f\u548cc\/c++\u7684\u5f02\u540c Rust\u8bed\u8a00\u7684\u5b8f\u8bbe\u8ba1\u5f97\u6bd4\u8f83\u590d\u6742\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u8bf4\u529f\u80fd\u975e\u5e38\u5f3a\u5927\uff0c\u8ddfc\/c++\u8bed\u8a00\u7684\u5b8f\u975e\u5e38\u4e0d\u4e00\u6837\u3002 \u76f8\u540c\u70b9 \u5f53\u7136\u662f\u5b8f\u80fd\u591f\u8ba9\u4ee3\u7801\u66f4\u7cbe\u7b80\uff0c\u7801\u519c\u53ef\u4ee5\u5c11\u6572\u5f88\u591a\u6837\u677f\u4ee3\u7801(boilerplate code)\u3002\u5f53\u7136\u4f60\u8bf4\u51fd\u6570\u548c\u7c7b\u4e0d\u4e5f\u53ef\u4ee5\u62bd\u8c61\u4ee3\u7801\uff0c\u4f7f\u4ee3\u7801\u7cbe\u7b80\u5417\uff1f\u4f46\u5b8f\u80fd\u591f\u83b7\u53d6\u5f88\u591a\u5728\u7f16\u8bd1\u671f\u7684\u4fe1\u606f\uff0c\u51fd\u6570\u548c\u7c7b\u5374\u4e0d\u80fd\u3002\u6bd4\u5982\uff0c\u4ee3\u7801\u6240\u5728\u7684\u6587\u4ef6\u548c\u884c\u6570\uff0c\u8fd9\u4e2a\u4fe1\u606f\u53ea\u6709\u5b8f\u624d\u80fd\u83b7\u5f97\u3002 \u4e0d\u540c\u70b9 \u662f\uff0cC\/C++\u7684\u5b8f\u53ea\u662f\u5728\u9884\u7f16\u8bd1\u671f\u7b80\u5355\u5730\u505a\u6a21\u5f0f\u66ff\u6362\uff0c\u9884\u7f16\u8bd1\u540e\u518d\u4ea4\u7531\u7f16\u8bd1\u5668\u3002c\/c++\u7684include\u5934\u6587\u4ef6\u5c55\u5f00\u4e5f\u662f\u5728\u9884\u7f16\u8bd1\u9636\u6bb5\u3002\u4f46Rust\u5b8f\u7684\u5c55\u5f00\u4e0d\u662f\u53d1\u751f\u5728\u9884\u7f16\u8bd1\u671f\uff0c\u800c\u662f\u7f16\u8bd1\u671f\u3002\u4e8e\u662fRust\u80fd\u591f\u83b7\u5f97\u66f4\u590d\u6742\u7684\u66f4\u8be6\u7ec6\u7684\u7f16\u8bd1\u5668\u7684\u4fe1\u606f\u3002\u8fd9\u91cc\u6709\u4e24\u4e2a\u6982\u5ff5Token Tree\u548cAST\u3002\u5982\u679c\u6709\u5927\u5b66\u9636\u6bb5\u5b66\u4e60\u8fc7\u7684\u7f16\u8bd1\u539f\u7406\u8bfe\u7a0b\u7684\u80cc\u666f\u5c31\u5f88\u5bb9\u6613\u7406\u89e3\u3002 Token Tree Token Tree\u7b80\u5199\u6210TT\u3002\u7f16\u8bd1\u5668\u62ff\u5230\u6e90\u4ee3\u7801\u540e\u5148\u505a\u8bcd\u6cd5\u5206\u6790\uff0c\u5373\u628a\u6e90\u4ee3\u7801\u5b57\u8282\u6d41\u5206\u6210\u4e00\u4e2a\u4e00\u4e2a\u7684token\u3002token\u548ctoken\u4e4b\u95f4\u7684\u903b\u8f91\u5173\u7cfb\u4e5f\u8bb0\u5f55\u4e0b\u6765\u3002\u6bd4\u5982\u4e0b\u9762\u7684\u4e00\u4e2a\u7b80\u5355\u8bed\u53e5\uff1a a + b + (c + d[0]) + e \u7684Token Tree\u5c31\u957f\u8fd9\u4e2a\u6837\u5b50\uff1a \u00aba\u00bb \u00ab+\u00bb \u00abb\u00bb \u00ab+\u00bb \u00ab( )\u00bb \u00ab+\u00bb \u00abe\u00bb \u256d\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e \u00abc\u00bb \u00ab+\u00bb \u00abd\u00bb \u00ab[ ]\u00bb \u256d\u2500\u2534\u2500\u256e \u00ab0\u00bb AST AST\u7684\u5168\u79f0\u662fAbstract Syntax Tree\uff0c\u62bd\u8c61\u8bed\u6cd5\u6811\u3002\u7f16\u8bd1\u5668\u628aToken Tree\u7ffb\u8bd1\u6210AST\uff0c\u8fd9\u662f\u4e00\u4e2a\u66f4\u6709\u5229\u4e8e\u7f16\u8bd1\u5668\u7406\u89e3\u6e90\u4ee3\u7801\u7684\u7ed3\u6784\u3002\u4e0a\u9762\u7684TT\u7ffb\u8bd1\u6210\u5bf9\u5e94\u7684AST\u540e\u957f\u8fd9\u4e2a\u6837\u5b50\uff1a \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 BinOp \u2502 \u2502 op: Add \u2502 \u250c\u2574\u2502 lhs: \u25cc &hellip; <a href=\"https:\/\/ykyi.net\/?p=1631\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Rust\u8bed\u8a00\u7684\u5b8f\u7f16\u7a0b\u6781\u7b80\u6559\u7a0bMacro&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[72],"class_list":["post-1631","post","type-post","status-publish","format-standard","hentry","category-tech_articles","tag-rust"],"_links":{"self":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/1631","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1631"}],"version-history":[{"count":0,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/1631\/revisions"}],"wp:attachment":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1631"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1631"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}