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authorjohannst <johannst@users.noreply.github.com>2021-09-13 22:26:20 +0000
committerjohannst <johannst@users.noreply.github.com>2021-09-13 22:26:20 +0000
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/parser.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parser.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
+<link rel="alternate icon" type="image/png" href="../../favicon-16x16.png">
+<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../llvm_kaleidoscope_rs/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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+<span id="460">460</span>
+</pre><pre class="rust">
+<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::lexer</span>::{<span class="ident">Lexer</span>, <span class="ident">Token</span>};
+
+<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
+<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ExprAST</span> {
+ <span class="doccomment">/// Number - Expression class for numeric literals like &quot;1.0&quot;.</span>
+ <span class="ident">Number</span>(<span class="ident">f64</span>),
+
+ <span class="doccomment">/// Variable - Expression class for referencing a variable, like &quot;a&quot;.</span>
+ <span class="ident">Variable</span>(<span class="ident">String</span>),
+
+ <span class="doccomment">/// Binary - Expression class for a binary operator.</span>
+ <span class="ident">Binary</span>(<span class="ident">char</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span>),
+
+ <span class="doccomment">/// Call - Expression class for function calls.</span>
+ <span class="ident">Call</span>(<span class="ident">String</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span>),
+}
+
+<span class="doccomment">/// PrototypeAST - This class represents the &quot;prototype&quot; for a function,</span>
+<span class="doccomment">/// which captures its name, and its argument names (thus implicitly the number</span>
+<span class="doccomment">/// of arguments the function takes).</span>
+<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
+<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PrototypeAST</span>(<span class="kw">pub</span> <span class="ident">String</span>, <span class="kw">pub</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>);
+
+<span class="doccomment">/// FunctionAST - This class represents a function definition itself.</span>
+<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
+<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FunctionAST</span>(<span class="kw">pub</span> <span class="ident">PrototypeAST</span>, <span class="kw">pub</span> <span class="ident">ExprAST</span>);
+
+<span class="doccomment">/// Parse result with String as Error type (to be compliant with tutorial).</span>
+<span class="kw">type</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">String</span><span class="op">&gt;</span>;
+
+<span class="doccomment">/// Parser for the `kaleidoscope` language.</span>
+<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>
+<span class="kw">where</span>
+ <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">&gt;</span>,
+{
+ <span class="ident">lexer</span>: <span class="ident">Lexer</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>,
+ <span class="ident">cur_tok</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span>,
+}
+
+<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>
+<span class="kw">where</span>
+ <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">&gt;</span>,
+{
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">lexer</span>: <span class="ident">Lexer</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
+ <span class="ident">Parser</span> {
+ <span class="ident">lexer</span>,
+ <span class="ident">cur_tok</span>: <span class="prelude-val">None</span>,
+ }
+ }
+
+ <span class="comment">// -----------------------</span>
+ <span class="comment">// Simple Token Buffer</span>
+ <span class="comment">// -----------------------</span>
+
+ <span class="doccomment">/// Implement the global variable `int CurTok;` from the tutorial.</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// # Panics</span>
+ <span class="doccomment">/// Panics if the parser doesn&#39;t have a current token.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cur_tok</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Token</span> {
+ <span class="self">self</span>.<span class="ident">cur_tok</span>.<span class="ident">as_ref</span>().<span class="ident">expect</span>(<span class="string">&quot;Parser: Expected cur_token!&quot;</span>)
+ }
+
+ <span class="doccomment">/// Advance the `cur_tok` by getting the next token from the lexer.</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement the fucntion `int getNextToken();` from the tutorial.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_next_token</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
+ <span class="self">self</span>.<span class="ident">cur_tok</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">lexer</span>.<span class="ident">gettok</span>());
+ }
+
+ <span class="comment">// ----------------------------</span>
+ <span class="comment">// Basic Expression Parsing</span>
+ <span class="comment">// ----------------------------</span>
+
+ <span class="doccomment">/// numberexpr ::= number</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParseNumberExpr();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_num_expr</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() {
+ <span class="ident">Token::Number</span>(<span class="ident">num</span>) <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="comment">// Consume the number token.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Number</span>(<span class="ident">num</span>))
+ }
+ <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable!</span>(),
+ }
+ }
+
+ <span class="doccomment">/// parenexpr ::= &#39;(&#39; expression &#39;)&#39;</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParseParenExpr();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_paren_expr</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="comment">// Eat &#39;(&#39; token.</span>
+ <span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>(), <span class="ident">Token::Char</span>(<span class="string">&#39;(&#39;</span>));
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_expression</span>()<span class="question-mark">?</span>;
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;)&#39;</span>) {
+ <span class="comment">// Eat &#39;)&#39; token.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="prelude-val">Ok</span>(<span class="ident">v</span>)
+ } <span class="kw">else</span> {
+ <span class="prelude-val">Err</span>(<span class="string">&quot;expected &#39;)&#39;&quot;</span>.<span class="ident">into</span>())
+ }
+ }
+
+ <span class="doccomment">/// identifierexpr</span>
+ <span class="doccomment">/// ::= identifier</span>
+ <span class="doccomment">/// ::= identifier &#39;(&#39; expression* &#39;)&#39;</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParseIdentifierExpr();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_identifier_expr</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">id_name</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur_tok</span>.<span class="ident">take</span>() {
+ <span class="prelude-val">Some</span>(<span class="ident">Token::Identifier</span>(<span class="ident">id</span>)) <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="comment">// Consume identifier.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="ident">id</span>
+ }
+ <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable!</span>(),
+ };
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;(&#39;</span>) {
+ <span class="comment">// Simple variable reference.</span>
+ <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Variable</span>(<span class="ident">id_name</span>))
+ } <span class="kw">else</span> {
+ <span class="comment">// Call.</span>
+
+ <span class="comment">// Eat &#39;(&#39; token.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
+
+ <span class="comment">// If there are arguments collect them.</span>
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;)&#39;</span>) {
+ <span class="kw">loop</span> {
+ <span class="kw">let</span> <span class="ident">arg</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_expression</span>()<span class="question-mark">?</span>;
+ <span class="ident">args</span>.<span class="ident">push</span>(<span class="ident">arg</span>);
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;)&#39;</span>) {
+ <span class="comment">// Eat &#39;)&#39; token.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="kw">break</span>;
+ }
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;,&#39;</span>) {
+ <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;Expected &#39;)&#39; or &#39;,&#39; in argument list&quot;</span>.<span class="ident">into</span>());
+ }
+
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ }
+ }
+
+ <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Call</span>(<span class="ident">id_name</span>, <span class="ident">args</span>))
+ }
+ }
+
+ <span class="doccomment">/// primary</span>
+ <span class="doccomment">/// ::= identifierexpr</span>
+ <span class="doccomment">/// ::= numberexpr</span>
+ <span class="doccomment">/// ::= parenexpr</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParsePrimary();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_primary</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() {
+ <span class="ident">Token::Identifier</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">parse_identifier_expr</span>(),
+ <span class="ident">Token::Number</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">parse_num_expr</span>(),
+ <span class="ident">Token::Char</span>(<span class="string">&#39;(&#39;</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">parse_paren_expr</span>(),
+ <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Err</span>(<span class="string">&quot;unknown token when expecting an expression&quot;</span>.<span class="ident">into</span>()),
+ }
+ }
+
+ <span class="comment">// -----------------------------</span>
+ <span class="comment">// Binary Expression Parsing</span>
+ <span class="comment">// -----------------------------</span>
+
+ <span class="doccomment">/// /// expression</span>
+ <span class="doccomment">/// ::= primary binoprhs</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParseExpression();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_expression</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">lhs</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_primary</span>()<span class="question-mark">?</span>;
+ <span class="self">self</span>.<span class="ident">parse_bin_op_rhs</span>(<span class="number">0</span>, <span class="ident">lhs</span>)
+ }
+
+ <span class="doccomment">/// binoprhs</span>
+ <span class="doccomment">/// ::= (&#39;+&#39; primary)*</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;ExprAST&gt; ParseBinOpRHS(int ExprPrec, std::unique_ptr&lt;ExprAST&gt; LHS);` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_bin_op_rhs</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expr_prec</span>: <span class="ident">isize</span>, <span class="kw-2">mut</span> <span class="ident">lhs</span>: <span class="ident">ExprAST</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">ExprAST</span><span class="op">&gt;</span> {
+ <span class="kw">loop</span> {
+ <span class="kw">let</span> <span class="ident">tok_prec</span> <span class="op">=</span> <span class="ident">get_tok_precedence</span>(<span class="self">self</span>.<span class="ident">cur_tok</span>());
+
+ <span class="comment">// Not a binary operator or precedence is too small.</span>
+ <span class="kw">if</span> <span class="ident">tok_prec</span> <span class="op">&lt;</span> <span class="ident">expr_prec</span> {
+ <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">lhs</span>);
+ }
+
+ <span class="kw">let</span> <span class="ident">binop</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur_tok</span>.<span class="ident">take</span>() {
+ <span class="prelude-val">Some</span>(<span class="ident">Token::Char</span>(<span class="ident">c</span>)) <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="comment">// Eat binary operator.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="ident">c</span>
+ }
+ <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable!</span>(),
+ };
+
+ <span class="comment">// lhs BINOP1 rhs BINOP2 remrhs</span>
+ <span class="comment">// ^^^^^^ ^^^^^^</span>
+ <span class="comment">// tok_prec next_prec</span>
+ <span class="comment">//</span>
+ <span class="comment">// In case BINOP1 has higher precedence, we are done here and can build a &#39;Binary&#39; AST</span>
+ <span class="comment">// node between &#39;lhs&#39; and &#39;rhs&#39;.</span>
+ <span class="comment">//</span>
+ <span class="comment">// In case BINOP2 has higher precedence, we take &#39;rhs&#39; as &#39;lhs&#39; and recurse into the</span>
+ <span class="comment">// &#39;remrhs&#39; expression first.</span>
+
+ <span class="comment">// Parse primary expression after binary operator.</span>
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rhs</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_primary</span>()<span class="question-mark">?</span>;
+
+ <span class="kw">let</span> <span class="ident">next_prec</span> <span class="op">=</span> <span class="ident">get_tok_precedence</span>(<span class="self">self</span>.<span class="ident">cur_tok</span>());
+ <span class="kw">if</span> <span class="ident">tok_prec</span> <span class="op">&lt;</span> <span class="ident">next_prec</span> {
+ <span class="comment">// BINOP2 has higher precedence thatn BINOP1, recurse into &#39;remhs&#39;.</span>
+ <span class="ident">rhs</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_bin_op_rhs</span>(<span class="ident">tok_prec</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">rhs</span>)<span class="question-mark">?</span>
+ }
+
+ <span class="ident">lhs</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(<span class="ident">binop</span>, <span class="ident">Box::new</span>(<span class="ident">lhs</span>), <span class="ident">Box::new</span>(<span class="ident">rhs</span>));
+ }
+ }
+
+ <span class="comment">// --------------------</span>
+ <span class="comment">// Parsing the Rest</span>
+ <span class="comment">// --------------------</span>
+
+ <span class="doccomment">/// prototype</span>
+ <span class="doccomment">/// ::= id &#39;(&#39; id* &#39;)&#39;</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;PrototypeAST&gt; ParsePrototype();` from the tutorial.</span>
+ <span class="kw">fn</span> <span class="ident">parse_prototype</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">PrototypeAST</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">id_name</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur_tok</span>.<span class="ident">take</span>() {
+ <span class="prelude-val">Some</span>(<span class="ident">Token::Identifier</span>(<span class="ident">id</span>)) <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="comment">// Consume the identifier.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+ <span class="ident">id</span>
+ }
+ <span class="ident">other</span> <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="comment">// Plug back current token.</span>
+ <span class="self">self</span>.<span class="ident">cur_tok</span> <span class="op">=</span> <span class="ident">other</span>;
+ <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;Expected function name in prototype&quot;</span>.<span class="ident">into</span>());
+ }
+ };
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;(&#39;</span>) {
+ <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;Expected &#39;(&#39; in prototype&quot;</span>.<span class="ident">into</span>());
+ }
+
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
+ <span class="kw">loop</span> {
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur_tok</span>.<span class="ident">take</span>() {
+ <span class="prelude-val">Some</span>(<span class="ident">Token::Identifier</span>(<span class="ident">arg</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">args</span>.<span class="ident">push</span>(<span class="ident">arg</span>),
+ <span class="prelude-val">Some</span>(<span class="ident">Token::Char</span>(<span class="string">&#39;,&#39;</span>)) <span class="op">=</span><span class="op">&gt;</span> {}
+ <span class="ident">other</span> <span class="op">=</span><span class="op">&gt;</span> {
+ <span class="self">self</span>.<span class="ident">cur_tok</span> <span class="op">=</span> <span class="ident">other</span>;
+ <span class="kw">break</span>;
+ }
+ }
+ }
+
+ <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">Token::Char</span>(<span class="string">&#39;)&#39;</span>) {
+ <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;Expected &#39;)&#39; in prototype&quot;</span>.<span class="ident">into</span>());
+ }
+
+ <span class="comment">// Consume &#39;)&#39;.</span>
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="prelude-val">Ok</span>(<span class="ident">PrototypeAST</span>(<span class="ident">id_name</span>, <span class="ident">args</span>))
+ }
+
+ <span class="doccomment">/// definition ::= &#39;def&#39; prototype expression</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;FunctionAST&gt; ParseDefinition();` from the tutorial.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_definition</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">FunctionAST</span><span class="op">&gt;</span> {
+ <span class="comment">// Consume &#39;def&#39; token.</span>
+ <span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>(), <span class="ident">Token::Def</span>);
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="kw">let</span> <span class="ident">proto</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_prototype</span>()<span class="question-mark">?</span>;
+ <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_expression</span>()<span class="question-mark">?</span>;
+
+ <span class="prelude-val">Ok</span>(<span class="ident">FunctionAST</span>(<span class="ident">proto</span>, <span class="ident">expr</span>))
+ }
+
+ <span class="doccomment">/// external ::= &#39;extern&#39; prototype</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;PrototypeAST&gt; ParseExtern();` from the tutorial.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_extern</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">PrototypeAST</span><span class="op">&gt;</span> {
+ <span class="comment">// Consume &#39;extern&#39; token.</span>
+ <span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">cur_tok</span>(), <span class="ident">Token::Extern</span>);
+ <span class="self">self</span>.<span class="ident">get_next_token</span>();
+
+ <span class="self">self</span>.<span class="ident">parse_prototype</span>()
+ }
+
+ <span class="doccomment">/// toplevelexpr ::= expression</span>
+ <span class="doccomment">///</span>
+ <span class="doccomment">/// Implement `std::unique_ptr&lt;FunctionAST&gt; ParseTopLevelExpr();` from the tutorial.</span>
+ <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_top_level_expr</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">FunctionAST</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_expression</span>()<span class="question-mark">?</span>;
+ <span class="kw">let</span> <span class="ident">proto</span> <span class="op">=</span> <span class="ident">PrototypeAST</span>(<span class="string">&quot;&quot;</span>.<span class="ident">into</span>(), <span class="ident">Vec::new</span>());
+ <span class="prelude-val">Ok</span>(<span class="ident">FunctionAST</span>(<span class="ident">proto</span>, <span class="ident">e</span>))
+ }
+}
+
+<span class="doccomment">/// Get the binary operator precedence.</span>
+<span class="doccomment">///</span>
+<span class="doccomment">/// Implement `int GetTokPrecedence();` from the tutorial.</span>
+<span class="kw">fn</span> <span class="ident">get_tok_precedence</span>(<span class="ident">tok</span>: <span class="kw-2">&amp;</span><span class="ident">Token</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">isize</span> {
+ <span class="kw">match</span> <span class="ident">tok</span> {
+ <span class="ident">Token::Char</span>(<span class="string">&#39;&lt;&#39;</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="number">10</span>,
+ <span class="ident">Token::Char</span>(<span class="string">&#39;+&#39;</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="number">20</span>,
+ <span class="ident">Token::Char</span>(<span class="string">&#39;-&#39;</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="number">20</span>,
+ <span class="ident">Token::Char</span>(<span class="string">&#39;*&#39;</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="number">40</span>,
+ <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="op">-</span><span class="number">1</span>,
+ }
+}
+
+<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
+<span class="kw">mod</span> <span class="ident">test</span> {
+ <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ExprAST</span>, <span class="ident">FunctionAST</span>, <span class="ident">Parser</span>, <span class="ident">PrototypeAST</span>};
+ <span class="kw">use</span> <span class="kw">crate</span><span class="ident">::lexer::Lexer</span>;
+
+ <span class="kw">fn</span> <span class="ident">parser</span>(<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">std::str::Chars</span><span class="op">&gt;</span> {
+ <span class="kw">let</span> <span class="ident">l</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="ident">input</span>.<span class="ident">chars</span>());
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parser::new</span>(<span class="ident">l</span>);
+
+ <span class="comment">// Drop initial coin, initialize cur_tok.</span>
+ <span class="ident">p</span>.<span class="ident">get_next_token</span>();
+
+ <span class="ident">p</span>
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_number</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;13.37&quot;</span>);
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_num_expr</span>(), <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Number</span>(<span class="number">13.37f64</span>)));
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_variable</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;foop&quot;</span>);
+
+ <span class="macro">assert_eq!</span>(
+ <span class="ident">p</span>.<span class="ident">parse_identifier_expr</span>(),
+ <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;foop&quot;</span>.<span class="ident">into</span>()))
+ );
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_primary</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;1337 foop \n bla(123)&quot;</span>);
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_primary</span>(), <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Number</span>(<span class="number">1337f64</span>)));
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_primary</span>(), <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;foop&quot;</span>.<span class="ident">into</span>())));
+
+ <span class="macro">assert_eq!</span>(
+ <span class="ident">p</span>.<span class="ident">parse_primary</span>(),
+ <span class="prelude-val">Ok</span>(<span class="ident">ExprAST::Call</span>(<span class="string">&quot;bla&quot;</span>.<span class="ident">into</span>(), <span class="macro">vec!</span>[<span class="ident">ExprAST::Number</span>(<span class="number">123f64</span>)]))
+ );
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_binary_op</span>() {
+ <span class="comment">// Operator before RHS has higher precedence, expected AST</span>
+ <span class="comment">//</span>
+ <span class="comment">// -</span>
+ <span class="comment">// / \</span>
+ <span class="comment">// + c</span>
+ <span class="comment">// / \</span>
+ <span class="comment">// a b</span>
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;a + b - c&quot;</span>);
+
+ <span class="kw">let</span> <span class="ident">binexpr_ab</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(
+ <span class="string">&#39;+&#39;</span>,
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">into</span>())),
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;b&quot;</span>.<span class="ident">into</span>())),
+ );
+
+ <span class="kw">let</span> <span class="ident">binexpr_abc</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(
+ <span class="string">&#39;-&#39;</span>,
+ <span class="ident">Box::new</span>(<span class="ident">binexpr_ab</span>),
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;c&quot;</span>.<span class="ident">into</span>())),
+ );
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_expression</span>(), <span class="prelude-val">Ok</span>(<span class="ident">binexpr_abc</span>));
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_binary_op2</span>() {
+ <span class="comment">// Operator after RHS has higher precedence, expected AST</span>
+ <span class="comment">//</span>
+ <span class="comment">// +</span>
+ <span class="comment">// / \</span>
+ <span class="comment">// a *</span>
+ <span class="comment">// / \</span>
+ <span class="comment">// b c</span>
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;a + b * c&quot;</span>);
+
+ <span class="kw">let</span> <span class="ident">binexpr_bc</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(
+ <span class="string">&#39;*&#39;</span>,
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;b&quot;</span>.<span class="ident">into</span>())),
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;c&quot;</span>.<span class="ident">into</span>())),
+ );
+
+ <span class="kw">let</span> <span class="ident">binexpr_abc</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(
+ <span class="string">&#39;+&#39;</span>,
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">into</span>())),
+ <span class="ident">Box::new</span>(<span class="ident">binexpr_bc</span>),
+ );
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_expression</span>(), <span class="prelude-val">Ok</span>(<span class="ident">binexpr_abc</span>));
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_prototype</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;foo(a,b)&quot;</span>);
+
+ <span class="kw">let</span> <span class="ident">proto</span> <span class="op">=</span> <span class="ident">PrototypeAST</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">into</span>(), <span class="macro">vec!</span>[<span class="string">&quot;a&quot;</span>.<span class="ident">into</span>(), <span class="string">&quot;b&quot;</span>.<span class="ident">into</span>()]);
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_prototype</span>(), <span class="prelude-val">Ok</span>(<span class="ident">proto</span>));
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_definition</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;def bar( arg0 , arg1 ) arg0 + arg1&quot;</span>);
+
+ <span class="kw">let</span> <span class="ident">proto</span> <span class="op">=</span> <span class="ident">PrototypeAST</span>(<span class="string">&quot;bar&quot;</span>.<span class="ident">into</span>(), <span class="macro">vec!</span>[<span class="string">&quot;arg0&quot;</span>.<span class="ident">into</span>(), <span class="string">&quot;arg1&quot;</span>.<span class="ident">into</span>()]);
+
+ <span class="kw">let</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">ExprAST::Binary</span>(
+ <span class="string">&#39;+&#39;</span>,
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;arg0&quot;</span>.<span class="ident">into</span>())),
+ <span class="ident">Box::new</span>(<span class="ident">ExprAST::Variable</span>(<span class="string">&quot;arg1&quot;</span>.<span class="ident">into</span>())),
+ );
+
+ <span class="kw">let</span> <span class="ident">func</span> <span class="op">=</span> <span class="ident">FunctionAST</span>(<span class="ident">proto</span>, <span class="ident">body</span>);
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_definition</span>(), <span class="prelude-val">Ok</span>(<span class="ident">func</span>));
+ }
+
+ <span class="attribute">#[<span class="ident">test</span>]</span>
+ <span class="kw">fn</span> <span class="ident">parse_extern</span>() {
+ <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="string">&quot;extern baz()&quot;</span>);
+
+ <span class="kw">let</span> <span class="ident">proto</span> <span class="op">=</span> <span class="ident">PrototypeAST</span>(<span class="string">&quot;baz&quot;</span>.<span class="ident">into</span>(), <span class="macro">vec!</span>[]);
+
+ <span class="macro">assert_eq!</span>(<span class="ident">p</span>.<span class="ident">parse_extern</span>(), <span class="prelude-val">Ok</span>(<span class="ident">proto</span>));
+ }
+}
+</pre></div>
+</section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="llvm_kaleidoscope_rs" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html> \ No newline at end of file
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