mirror of
https://github.com/apache/datafusion-sqlparser-rs.git
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40853fe412
https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports "Import with single component use path such as `use cratename;` is not necessary, and thus should be removed."
67 lines
2.3 KiB
Rust
67 lines
2.3 KiB
Rust
// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#![warn(clippy::all)]
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///! A small command-line app to run the parser.
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/// Run with `cargo run --example cli`
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use std::fs;
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use sqlparser::dialect::*;
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use sqlparser::parser::Parser;
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fn main() {
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simple_logger::init().unwrap();
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let filename = std::env::args().nth(1).expect(
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"No arguments provided!\n\n\
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Usage: cargo run --example cli FILENAME.sql [--dialectname]",
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);
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let dialect: Box<dyn Dialect> = match std::env::args().nth(2).unwrap_or_default().as_ref() {
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"--ansi" => Box::new(AnsiDialect {}),
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"--postgres" => Box::new(PostgreSqlDialect {}),
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"--ms" => Box::new(MsSqlDialect {}),
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"--generic" | "" => Box::new(GenericDialect {}),
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s => panic!("Unexpected parameter: {}", s),
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};
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println!("Parsing from file '{}' using {:?}", &filename, dialect);
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let contents = fs::read_to_string(&filename)
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.unwrap_or_else(|_| panic!("Unable to read the file {}", &filename));
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let without_bom = if contents.chars().next().unwrap() as u64 != 0xfeff {
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contents.as_str()
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} else {
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let mut chars = contents.chars();
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chars.next();
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chars.as_str()
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};
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let parse_result = Parser::parse_sql(&*dialect, without_bom.to_owned());
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match parse_result {
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Ok(statements) => {
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println!(
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"Round-trip:\n'{}'",
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statements
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.iter()
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.map(std::string::ToString::to_string)
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.collect::<Vec<_>>()
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.join("\n")
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);
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println!("Parse results:\n{:#?}", statements);
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std::process::exit(0);
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}
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Err(e) => {
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println!("Error during parsing: {:?}", e);
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std::process::exit(1);
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}
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}
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}
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