pest parser

Cargo.lock

@@ -145,6 +145,15 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "327762f6e5a765692301e5bb513e0d9fef63be86bbc14528052b1cd3e6f03e07"
 
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "bstr"
 version = "1.9.0"
@@ -296,6 +305,15 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "criterion"
 version = "0.5.1"
@@ -364,6 +382,16 @@ version = "0.8.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
 
+[[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
 [[package]]
 name = "cucumber"
 version = "0.20.2"
@@ -445,6 +473,16 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
 [[package]]
 name = "drain_filter_polyfill"
 version = "0.1.3"
@@ -562,6 +600,16 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.12"
@@ -905,6 +953,59 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9555b1514d2d99d78150d3c799d4c357a3e2c2a8062cd108e93a06d9057629c5"
 
+[[package]]
+name = "pest"
+version = "2.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f200d8d83c44a45b21764d1916299752ca035d15ecd46faca3e9a2a2bf6ad06"
+dependencies = [
+ "memchr",
+ "thiserror",
+ "ucd-trie",
+]
+
+[[package]]
+name = "pest-demo"
+version = "0.1.0"
+dependencies = [
+ "pest",
+ "pest_derive",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcd6ab1236bbdb3a49027e920e693192ebfe8913f6d60e294de57463a493cfde"
+dependencies = [
+ "pest",
+ "pest_generator",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a31940305ffc96863a735bef7c7994a00b325a7138fdbc5bda0f1a0476d3275"
+dependencies = [
+ "pest",
+ "pest_meta",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7ff62f5259e53b78d1af898941cdcdccfae7385cf7d793a6e55de5d05bb4b7d"
+dependencies = [
+ "once_cell",
+ "pest",
+ "sha2",
+]
+
 [[package]]
 name = "pin-project"
 version = "1.1.3"
@@ -1175,6 +1276,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.9"
@@ -1373,6 +1485,18 @@ dependencies = [
  "syn 2.0.48",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+
+[[package]]
+name = "ucd-trie"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed646292ffc8188ef8ea4d1e0e0150fb15a5c2e12ad9b8fc191ae7a8a7f3c4b9"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
@@ -1397,6 +1521,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "walkdir"
 version = "2.4.0"

Cargo.toml

@@ -4,6 +4,7 @@ members = [
   "members/criterion-demo",
   "members/cucumber-demo",
   "members/panic-calm",
+  "members/pest-demo",
   "members/revsqrt",
   "members/serde-json-demo",
   "members/slog-demo",
@@ -11,8 +12,9 @@ members = [
 ]
 default-members = [
   ".",
-  "members/criterion-demo",
   "members/revsqrt",
+  "members/criterion-demo",
+  "members/pest-demo",
   "members/serde-json-demo",
   "members/slog-demo",
   "members/cucumber-demo",

members/pest-demo/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "pest-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+pest = "2.6"
+pest_derive = "2.6"

members/pest-demo/data/example.csv

@@ -0,0 +1,5 @@
+65279,1179403647,1463895090
+3.1415927,2.7182817,1.618034
+-40,-273.15
+13,42
+65537

members/pest-demo/src/csv.pest

@@ -0,0 +1,3 @@
+file = { SOI ~ (record ~ "\n")* ~ EOI }
+record = { field ~ ("," ~ field)* }
+field = { (ASCII_DIGIT | "." | "-")+ }

members/pest-demo/src/main.rs

@@ -0,0 +1,42 @@
+use std::fs;
+
+use pest::Parser;
+use pest_derive::Parser;
+
+#[derive(Parser)]
+#[grammar = "csv.pest"]
+pub struct CSVParser;
+
+fn main() {
+    println!("cwd: {:?}", std::env::current_dir().unwrap());
+    let unparsed_file = fs::read_to_string("pest-demo/data/example.csv").expect("cannot read file");
+    let file = CSVParser::parse(Rule::file, &unparsed_file)
+        .expect("unsuccessful parse") // unwrap the parse result
+        .next()
+        .unwrap(); // get and unwrap the `file` rule; never fails
+                   // let mut field_sum: f64 = 0.0;
+    let mut field_sum: f64 = 0.0;
+    let mut record_count: u64 = 0;
+
+    println!("{:=^80}", "");
+    for record in file.into_inner() {
+        match record.as_rule() {
+            Rule::record => {
+                print!("|");
+                record_count += 1;
+
+                for field in record.into_inner() {
+                    field_sum += field.as_str().parse::<f64>().unwrap();
+                    print!("{:^25}|", field.as_str());
+                }
+                println!();
+            }
+            Rule::EOI => (),
+            _ => unreachable!(),
+        }
+    }
+    println!("{:=^80}", "");
+
+    println!("Sum of fields: {}", field_sum);
+    println!("Number of records: {}", record_count);
+}