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