From: Tan Kian-ting <chenjt30@gmail.com>
Date: Sun, 3 Dec 2023 14:27:12 +0000 (+0800)
Subject: parser
X-Git-Url: https://git.kianting.info/?a=commitdiff_plain;h=414b4a5da4eb8220c6695a2c2bc1022d3b338f34;p=anotherTypesetter

parser
---

diff --git a/docs/#defineASTandGrammar.md# b/docs/#defineASTandGrammar.md#
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+# Ch1 定義抽象語法樹和語法
+
+## 抽象語法樹
+
+C語言、Python語言就算有許多的關鍵字、操作符、符號或是常數變數，在編譯器分析語法以後，最後會轉成編譯器可以操作的樹結構，然後再轉成我們想要的另一個語言的樹，最後輸出另一個語言的程式碼。
+
+但是什麼叫做抽象語法樹呢？我們先從一點句法知識來談。
+
+學過中學中文文法的課程，會背一堆類似「主詞+動詞+受詞」、「主詞+(有/無)+受詞」的結構。可以換個說法，是句子=「主詞+動詞+受詞」或是「主詞+(有/無)+賓詞」的形式。我們將「=」寫成「::=」，「/」（或是）寫成「|」，「動詞」擴充變成「動詞片語」，就變成：
+
+```
+  句子 ::= (主詞 動詞片語 受詞) | (主詞 (有 | 無) 受詞)...
+
+```
+
+為了易讀所以寫成：
+
+```
+句子 ::= 主詞 動詞片語 受詞
+         | 主詞 (有 | 無) 受詞
+         | ...
+
+```
+
+用這種形式表示的語言句法，叫做「BNF文法」。這種句法看起來很語言學，但是我們想：受詞和主詞可以為名詞、專有名詞或是「形容詞+名詞」；動詞片語可以為動詞或是「副詞+動詞」。因此這樣之規則，就可以生成許多句子，比如「我有筆」、「張三養貓」、「小芳慢慢移動檯燈」等等的句子。然後句子可以用上述規則，分析成語法的樹狀結構，如下圖把「我曾旅居新竹」寫成語法樹。
+
+<figure markdown>
+  ![「我曾旅居新竹」的語法樹](syntaxtree.svg "")
+  <figcaption>「我曾旅居新竹」的語法樹</figcaption>
+</figure>
+
+
+
+
+同理，程式語言通常也有更嚴謹的這樣生成文法，可以用幾個簡單規則生出繁多的程式碼，而且合乎語法規定。這種生成文法也可檢查輸入的程式碼有沒有符合句法的規定。而這種語法生成的程式碼，去掉不需要的逗號等等符號，當然也可以做成語法樹，就是抽象語法樹 (abstract syntax tree, AST)，如下圖所示。
+<figure markdown>
+  ![「(2+2) == 4」的語法樹。注意括號已經刪除。](syntaxtree2.svg "")
+  <figcaption>「(2+2) == 4」的語法樹。注意括號已經刪除。</figcaption>
+</figure>
+
+
+而上文的抽象語法樹，可以是我們把程式經過編譯器分析之後，用「樹」儲存的資料結構。而樹形結構我們可以使用Lisp語言的S表達式(S-expressiom; S-exp)來表示，本文採用這樣的表示方法。所以上文的`(2+2)==4`即`(== (+ 2 2) 4)`；`let baz = foo("bar")`，若是把foo("bar")這種函數套用(apply)寫成`(APPLY foo "bar")`，則其S-exp語法樹可寫為`(let baz(APPLY foo "bar"))`。
+
+## 決定語法
+那我們要如何制定這個語言的語法，這樣我們才能夠寫出符合這個語法的函數，然後再用tokenizer和parser轉成AST樹。
+
+不考慮` + - * /`這種運算子，以及向量的表示子，函數可以用`ID(arg1, arg2, ...)`這種方式來表示，其中`arg_x`是引數，`ID`是識別子（identifier，可以把它想成變函數的名字）。
+
+變數可以是`ID`，`arg_n`可以是`ID`或常數（量）。
+
+常數（量）的表示法可以是下列任一：
+
+  - 浮點數如0.0, 36.8，BNF風格的表達法為：`[0-9]+ '.' [0-9]+`。`'c'`指c這個文字，`+`表示前面的重複1次以上；`[0-9]`表示數字0到9。
+
+  - 整數如22、0：`[0-9]+`
+
+  - 字串：`'"' (不是「"」的任一字元|('\' '"'))   '"'`（`.`表示任何一個字元）
+
+然而我們還是需要綁定變數`let x = var in boby`（在`body`裡面，`x`指代`var`）、`set x = var`（改變變數值）、lambda`lambda (x)=>{body}`。另外為了要區別要在PDF印上去的一般字元，在這個檔案的常數、變數、函數、關鍵字等前後需要加@表示（但是函數、lambda裡面的變數不用）。比如`@foo(a, b)@`、`@lambda(x)@`、`@"IAmAString"@`、`@2.2@`、`@3@`（後三者應該很少用到）可是若需在PDF印`@`時怎辦？那就用`\@`。比如`foo\@example.com`。
+
+所以我們可以定義以下的BNF風文法：
+
+```
+Language ::= PrintTxt | Exprs
+
+PrintTxt ::= (('\' '@')| 非@字元)+ //「我是一隻貓」或是「www\@example.com」
+
+Exprs ::= @ Expr* @ // *表示前面的重複0次以上（包含不出現）
+
+Expr ::= (Letting | Setting | Lambda | Apply | Var| Const) | "(" Expr ")"
+
+Letting ::= "let" Var "=" Expr "in" Expr // let foo = 12 in ...
+
+Setting ::= Var ":=" Expr "in"  Expr // foo := a in ...
+
+Lambda ::= "fn" Var "->" Expr // fn x -> 12
+
+Apply ::= Expr Expr // foo 3 即foo(3)
+
+Var ::= ID
+
+Const ::= String | Float | Int
+
+ID ::=  ("_" | [a-z] |  [A-Z])  ("_" | [0-9] | [a-z] |  [A-Z])+
+
+Integer ::= [0-9]+
+
+Float ::= [0-9]+ "." [0-9]+
+
+String ::= '"' (不是「"」的任一字元|('\' '"'))   '"'
+```
+
+## 用ParserCombinator進行tokenize
+Parser combinator（分析器組合子）是一種利用高階函數來簡化分析器撰寫的辦法。這講到頭來會涉及「遞歸下降分析」以及其他編譯理論的東西，但太難了（聽說可以讀編譯理論的「龍書我們可以製作一個小的tokenizer。但是因為自己寫parser combinator太累了，所以我們就用nom來幫我們代勞。
+」）。講一個簡單的案例吧：
+
+假設我們想要將字串的開頭match 0~9 之中的其中一個，我們可以寫一個函數match0to9如下：
+
+```
+function match0to9(string){
+if (string[0] in 0,1,..,9){
+    let rest = string[1:];
+    let matched = string[0];
+    return {type: "OK", rest : rest, matched : matched};
+}
+else{
+    return {type : "Nothing"};
+    }
+}
+```
+
+假設我們要將字串`s`的前3個字的match 0~9呢？如果會高階函數的話，引入一個`then`函數，然後把`match0to9`傳進去，這樣寫起來比較簡潔，行數可以比較少：
+
+```
+function thenDo(input, fun){
+    if (input.type != "Nothing"{
+        
+        middle =  fun(input.rest);
+        if (middle.type != "Nothing"){
+            // add the matched character of input to the head of the result
+            middle.matched = input.matched + middle.matched
+            return middle;
+         }else{
+             return middle; // return nothing
+         }
+    }else{
+        input; // return nothing
+    }
+
+}
+
+// "s" should be wrapped in a object
+let sWrapped = {type : "OK", rest : s, matched : ""};
+
+// match0~9 3 times
+thenDo(thenDo(thenDo(sWrapped, match0to9), match0to9), match0to9)
+```
+我們可以製作一個小的tokenizer。但是因為自己寫parser combinator太累了，所以我們就用nom來幫我們代勞。
+
+
+安裝nom可以用：`cargo run nom`。
+
+假設我們要match 0-9任意次以上（就是integer），我們可以這樣寫：
+
+```
+
+// import all the parser unit for string
+use nom::character::complete::*;
+// for the return type
+use nom::IResult;
+
+// integer ::= [0-9]+
+pub fn integer(input: &str) -> IResult<&str, &str> {
+    return digit1(input) ; // [0-9]+
+}
+
+// test parser
+#[cfg(test)]
+mod tests {
+    // import the functions ouside mod tests
+    use super::*;
+
+    // test integer
+    #[test]
+    fn test_integer() {
+    //if no error is shown, the function passes the test
+    assert_eq!(integer("12345"), Ok(("", "12345")));
+    assert_eq!(integer("0"), Ok(("", "0")));
+    }
+}
+
+
+```
+
+用`cargo run`可以順利通過：
+
+```
+running 1 test
+test tests::test_integer ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+```
+
+我們做第二個tokenizer，`float`：
+
+其中的`recognize`蒐集所有包在裡面的`parsers`的string。
+```
+// collect matched strings of all the parsers,
+use nom::combinator::recognize;
+// given 2 parser and gets the result as (1st_matched, 2nd_matched),
+use nom::sequence::pair;
+// exact matching characters
+use nom::bytes::complete::tag;
+
+// float ::= [0-9]+ "." [0-9]+
+pub fn float(input: &str) -> IResult<&str, &str>{
+    // [0-9]+ "." [0-9]+
+    // "12.345" returns Ok((else, (("12", '.'), "345"))), then recgonize them as
+    // Ok("12.345")
+    let a = 
+        recognize(pair(pair(digit1, tag(".")), digit1))(input);
+    return a;
+
+}
+
+```
+
+parser `identifier`（引用的函數的名稱空間略）。使用`fold_may0`和新的空vector來儲存match多次的parser的符合結果：
+```
+pub fn identifier(input : &str) -> IResult<&str, &str>{
+    return recognize(pair(
+        // 1st character is a-z, A-Z or _
+        satisfy(|c| (is_alphabetic(c as u8) || c == '_')),
+        // the tail characters (0+ times matched) storing in a vector
+    fold_many0(
+        // a-z, A-Z, 0-9, _ 
+        satisfy(|c| (is_alphanumeric(c as u8) || c == '_')),
+        // initial vector
+        Vec::new,
+        // once it matches, append the matched item to the vector.
+        |mut acc: Vec<_>, item| {
+          acc.push(item);
+          acc
+        }
+      )))(input);
+    
+}
+
+
+```
+
+
+## 平面操作
+
+### 基本函數與直譯器
+我們藉由以上的概念，可以定義一個將文字、線條等形狀排列到2D平面的語法，畢竟不論輸出PDF、SVG等等，粗略而言，就是一種2D平面安放文字的語言。另外PDF的格式相當晦澀，就算_PDF Explained_的PDF教學，也還是要輔助使用其他的工具，沒辦法看了就自己手刻PDF，所以還是用`printpdf`來教學吧。
+
+現在我們初始化一個專案目錄，然後將需要的S-exp函式庫和pdf函數庫指定為相依函式庫：
+
+```
+cargo init; 
+
+cargo add rsexp printpdf;
+```
+
+我們可以定義一些表達式（包含函數、資料結構，S-exp形式）的說明如下。`'()`表示空列表(empty list)，因為都要表達是函數的引用，所有的函數寫成形式`(Func "函數名稱" (引數1 引數2 ....))`。Float指64位元浮點數：
+
+``` 
+(px Float) ; px表達pixel單位，儲存浮點數
+(pt Float) ; pt表達point單位，儲存浮點數
+(style (str pt)) ; 文字樣式。String表示字型的路徑[fontPath]，Float表示字型大小(in Pt) (fontSize)
+(str String) ; 儲存字串
+(func "createPDF" '()) ;新增PDF
+(func "createPage" '()) ;新增頁面
+(func "writePdf" '(str)) ;寫入PDF頁面，String是PATH
+
+(func "putchar" '(str style x y)) ; x 軸向右，y 軸向下，str 表示字元(char)，style 表示文字樣式
+```
+
+`main.rs`先引用函式庫：
+`use printpdf::*;`
+
+
+其中 `px`、`pt`是單位，所以可以在`main.rs`這樣定義：
+
+```
+enum Measure{
+    Pt(f64),
+    Px(f64)
+}
+```
+
+最後一次定義expression：
+```
+enum Expr{
+    Mea(Measure), // wrapper for measure
+    Str(&str),
+    Style{font_path : Measure, size : Measure},
+    Func(&str, Vec<Expr>),
+    Void // return nothing
+}
+```
+
+然後我們可以這樣定義一個處理輸入輸出的interpreter於`interp`，並修改`main.rs`如下，縱使我們準時：
+```
+fn interp(exp : Expr)->(){
+    // the function will be extended.
+      match exp {
+      Expr::Mea(Measure::Pt(x)) => println!("{:?} pt", x),
+      Expr::Mea(Measure::Px(x)) => println!("{:?} px", x),
+      
+        _ => println!("not found expression"),
+    };
+}
+
+// exexute interpreter
+fn main() {
+    interp(Expr::Mea(Measure::Pt(2.2)));
+    interp(Expr::Flo(2.2));
+}
+```
diff --git a/docs/.#defineASTandGrammar.md b/docs/.#defineASTandGrammar.md
new file mode 120000
index 0000000..26c8773
--- /dev/null
+++ b/docs/.#defineASTandGrammar.md
@@ -0,0 +1 @@
+yoxem@yoxem-HP-Laptop-15-fd0072.12930:1701431741
\ No newline at end of file
diff --git a/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/output-test-bin-ch1 b/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/output-test-bin-ch1
index 598597e..337b200 100644
--- a/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/output-test-bin-ch1
+++ b/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/output-test-bin-ch1
@@ -1,2 +1,5 @@
-{"message":"unused `#[macro_use]` import","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":109,"byte_end":121,"line_start":4,"line_end":4,"column_start":1,"column_end":13,"is_primary":true,"text":[{"text":"#[macro_use]","highlight_start":1,"highlight_end":13}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_imports)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused `#[macro_use]` import\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:4:1\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m4\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m#[macro_use]\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(unused_imports)]` on by default\u001b[0m\n\n"}
-{"message":"1 warning emitted","code":null,"level":"warning","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: 1 warning emitted\u001b[0m\n\n"}
+{"message":"cannot find macro `recognize` in this scope","code":null,"level":"error","spans":[{"file_name":"src/main.rs","byte_start":1008,"byte_end":1017,"line_start":36,"line_end":36,"column_start":12,"column_end":21,"is_primary":true,"text":[{"text":"    return recognize!(pair(","highlight_start":12,"highlight_end":21}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`recognize` is imported here, but it is a function, not a macro","code":null,"level":"note","spans":[{"file_name":"src/main.rs","byte_start":229,"byte_end":255,"line_start":10,"line_end":10,"column_start":5,"column_end":31,"is_primary":true,"text":[{"text":"use nom::combinator::recognize;","highlight_start":5,"highlight_end":31}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror\u001b[0m\u001b[0m\u001b[1m: cannot find macro `recognize` in this scope\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:36:12\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m36\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    return recognize!(pair(\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m           \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^^^^^^^^^\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;10mnote\u001b[0m\u001b[0m: `recognize` is imported here, but it is a function, not a macro\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:10:5\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m10\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse nom::combinator::recognize;\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;10m^^^^^^^^^^^^^^^^^^^^^^^^^^\u001b[0m\n\n"}
+{"message":"unused imports: `is_alphabetic`, `is_alphanumeric`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":75,"byte_end":90,"line_start":2,"line_end":2,"column_start":35,"column_end":50,"is_primary":true,"text":[{"text":"use nom::character::{complete::*, is_alphanumeric, is_alphabetic};","highlight_start":35,"highlight_end":50}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":92,"byte_end":105,"line_start":2,"line_end":2,"column_start":52,"column_end":65,"is_primary":true,"text":[{"text":"use nom::character::{complete::*, is_alphanumeric, is_alphabetic};","highlight_start":52,"highlight_end":65}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_imports)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove the unused imports","code":null,"level":"help","spans":[{"file_name":"src/main.rs","byte_start":73,"byte_end":105,"line_start":2,"line_end":2,"column_start":33,"column_end":65,"is_primary":true,"text":[{"text":"use nom::character::{complete::*, is_alphanumeric, is_alphabetic};","highlight_start":33,"highlight_end":65}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused imports: `is_alphabetic`, `is_alphanumeric`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:2:35\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m2\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse nom::character::{complete::*, is_alphanumeric, is_alphabetic};\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m                                  \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^^^^\u001b[0m\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^^\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(unused_imports)]` on by default\u001b[0m\n\n"}
+{"message":"unused `#[macro_use]` import","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":109,"byte_end":121,"line_start":4,"line_end":4,"column_start":1,"column_end":13,"is_primary":true,"text":[{"text":"#[macro_use]","highlight_start":1,"highlight_end":13}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused `#[macro_use]` import\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:4:1\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m4\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m#[macro_use]\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^\u001b[0m\n\n"}
+{"message":"unused import: `nom::multi::fold_many0`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":440,"byte_end":462,"line_start":16,"line_end":16,"column_start":5,"column_end":27,"is_primary":true,"text":[{"text":"use nom::multi::fold_many0;","highlight_start":5,"highlight_end":27}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"remove the whole `use` item","code":null,"level":"help","spans":[{"file_name":"src/main.rs","byte_start":436,"byte_end":463,"line_start":16,"line_end":16,"column_start":1,"column_end":28,"is_primary":true,"text":[{"text":"use nom::multi::fold_many0;","highlight_start":1,"highlight_end":28}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused import: `nom::multi::fold_many0`\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:16:5\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m16\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse nom::multi::fold_many0;\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^^^^^^^^^^^\u001b[0m\n\n"}
+{"message":"aborting due to previous error; 3 warnings emitted","code":null,"level":"error","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror\u001b[0m\u001b[0m\u001b[1m: aborting due to previous error; 3 warnings emitted\u001b[0m\n\n"}
diff --git a/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/test-bin-ch1 b/src/ch1/target/debug/.fingerprint/ch1-07d4929d340d9efb/test-bin-ch1
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