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Improve query parser. Am still not happy with it though.

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There must be some way that I can retain the eof() after the `then` that means I don't have to move the skip on spaces and eof

Make in process command storing clearer.

Add comments around in process commands.
Add alternative commands for transact/t and query/q
This commit is contained in:
Emily Toop 2017-05-22 13:13:03 +01:00
parent a8bb996e4f
commit e0548e9be2
3 changed files with 73 additions and 45 deletions
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75
tools/cli/src/mentat_cli/command_parser.rs
View file

@ -9,10 +9,9 @@
// specific language governing permissions and limitations under the License.
use combine::{
any,
eof,
many,
many1,
parser,
satisfy,
sep_end_by,
token,
@ -28,6 +27,8 @@ use combine::combinator::{
try
};
use combine::primitives::Consumed;
use errors as cli;
use edn;
@ -35,8 +36,10 @@ use edn;
pub static HELP_COMMAND: &'static str = &"help";
pub static OPEN_COMMAND: &'static str = &"open";
pub static CLOSE_COMMAND: &'static str = &"close";
pub static QUERY_COMMAND: &'static str = &"q";
pub static TRANSACT_COMMAND: &'static str = &"t";
pub static QUERY_COMMAND: &'static str = &"query";
pub static ALT_QUERY_COMMAND: &'static str = &"q";
pub static TRANSACT_COMMAND: &'static str = &"transact";
pub static ALT_TRANSACT_COMMAND: &'static str = &"t";
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Command {
@ -90,6 +93,8 @@ pub fn command(s: &str) -> Result<Command, cli::Error> {
let close_parser = string(CLOSE_COMMAND)
.with(arguments())
.skip(spaces())
.skip(eof())
.map(|args| {
if args.len() > 0 {
return Err(cli::ErrorKind::CommandParse(format!("Unrecognized argument {:?}", args[0])).into());
@ -97,27 +102,24 @@ pub fn command(s: &str) -> Result<Command, cli::Error> {
Ok(Command::Close)
});
let opening_brace_parser = try(string("["))
.or(try(string("{")));
let edn_arg_parser = spaces()
.and(opening_brace_parser.clone()
.and(many::<Vec<_>, _>(try(any()))));
let edn_arg_parser = || spaces()
.with(try(string("["))
.or(try(string("{")))
.then(|d| parser(move |input| {
let _: &str = input;
Ok((d.to_string() + input, Consumed::Empty(input)))
})));
let query_parser = string(QUERY_COMMAND)
.and(edn_arg_parser.clone())
.map( |x| {
let args = (x.1).1;
let content: String = args.1.iter().collect();
Ok(Command::Query(format!("{}{}", args.0, content)))
});
let query_parser = try(string(QUERY_COMMAND)).or(try(string(ALT_QUERY_COMMAND)))
.with(edn_arg_parser())
.map(|x| {
Ok(Command::Query(x))
});
let transact_parser = string(TRANSACT_COMMAND)
.and(edn_arg_parser.clone())
let transact_parser = try(string(TRANSACT_COMMAND)).or(try(string(ALT_TRANSACT_COMMAND)))
.with(edn_arg_parser())
.map( |x| {
let args = (x.1).1;
let content: String = args.1.iter().collect();
Ok(Command::Transact(format!("{}{}", args.0, content)))
Ok(Command::Transact(x))
});
spaces()
@ -128,11 +130,8 @@ pub fn command(s: &str) -> Result<Command, cli::Error> {
&mut try(close_parser),
&mut try(query_parser),
&mut try(transact_parser)]))
.skip(spaces())
.skip(eof())
.parse(s)
.map(|x| x.0)
.unwrap_or(Err(cli::ErrorKind::CommandParse(format!("Invalid command {:?}", s)).into()))
.unwrap_or((Err(cli::ErrorKind::CommandParse(format!("Invalid command {:?}", s)).into()), "")).0
}
#[cfg(test)]
@ -283,6 +282,16 @@ mod tests {
}
}
#[test]
fn test_query_parser_alt_query_command() {
let input = ".query [:find ?x :where [?x foo/bar ?y]]";
let cmd = command(&input).expect("Expected query command");
match cmd {
Command::Query(edn) => assert_eq!(edn, "[:find ?x :where [?x foo/bar ?y]]"),
_ => assert!(false)
}
}
#[test]
fn test_query_parser_incomplete_edn() {
let input = ".q [:find ?x\r\n";
@ -319,10 +328,20 @@ mod tests {
#[test]
fn test_transact_parser_complete_edn() {
let input = ".t [:db/add \"s\" :db/ident :foo/uuid]";
let input = ".t [[:db/add \"s\" :db/ident :foo/uuid] [:db/add \"r\" :db/ident :bar/uuid]]";
let cmd = command(&input).expect("Expected transact command");
match cmd {
Command::Transact(edn) => assert_eq!(edn, "[:db/add \"s\" :db/ident :foo/uuid]"),
Command::Transact(edn) => assert_eq!(edn, "[[:db/add \"s\" :db/ident :foo/uuid] [:db/add \"r\" :db/ident :bar/uuid]]"),
_ => assert!(false)
}
}
#[test]
fn test_transact_parser_alt_command() {
let input = ".transact [[:db/add \"s\" :db/ident :foo/uuid] [:db/add \"r\" :db/ident :bar/uuid]]";
let cmd = command(&input).expect("Expected transact command");
match cmd {
Command::Transact(edn) => assert_eq!(edn, "[[:db/add \"s\" :db/ident :foo/uuid] [:db/add \"r\" :db/ident :bar/uuid]]"),
_ => assert!(false)
}
}

32
tools/cli/src/mentat_cli/input.rs
View file

@ -35,8 +35,8 @@ pub enum InputResult {
MetaCommand(Command),
/// An empty line
Empty,
/// Needs more input; i.e. there is an unclosed delimiter
More(Command),
/// Needs more input
More,
/// End of file reached
Eof,
}
@ -45,6 +45,7 @@ pub enum InputResult {
pub struct InputReader {
buffer: String,
reader: Option<Reader<DefaultTerminal>>,
in_process_cmd: Option<Command>,
}
impl InputReader {
@ -61,6 +62,7 @@ impl InputReader {
InputReader{
buffer: String::new(),
reader: r,
in_process_cmd: None,
}
}
@ -72,8 +74,9 @@ impl InputReader {
/// Reads a single command, item, or statement from `stdin`.
/// Returns `More` if further input is required for a complete result.
/// In this case, the input received so far is buffered internally.
pub fn read_input(&mut self, in_process_cmd: Option<Command>) -> Result<InputResult, cli::Error> {
let line = match self.read_line(if in_process_cmd.is_some() { MORE_PROMPT } else { DEFAULT_PROMPT }) {
pub fn read_input(&mut self) -> Result<InputResult, cli::Error> {
let prompt = if self.in_process_cmd.is_some() { MORE_PROMPT } else { DEFAULT_PROMPT };
let line = match self.read_line(prompt) {
Some(s) => s,
None => return Ok(Eof),
};
@ -86,27 +89,32 @@ impl InputReader {
self.add_history(&line);
let cmd = match in_process_cmd {
Some(Command::Query(args)) => {
Command::Query(args + " " + &line)
// if we have a command in process (i.e. in incomplete query or transaction),
// then we already know which type of command it is and so we don't need to parse the
// command again, only the content, which we do later.
// Therefore, we add the newly read in line to the existing command args.
// If there is no in process command, we parse the read in line as a new command.
let cmd = match &self.in_process_cmd {
&Some(Command::Query(ref args)) => {
Command::Query(args.clone() + " " + &line)
},
Some(Command::Transact(args)) => {
Command::Transact(args + " " + &line)
&Some(Command::Transact(ref args)) => {
Command::Transact(args.clone() + " " + &line)
},
_ => {
try!(command(&self.buffer))
}
};
println!("processing {:?}", cmd);
match cmd {
Command::Query(_) |
Command::Transact(_) if !cmd.is_complete() => {
Ok(More(cmd))
self.in_process_cmd = Some(cmd);
Ok(More)
},
_ => {
self.buffer.clear();
self.in_process_cmd = None;
Ok(InputResult::MetaCommand(cmd))
}
}

11
tools/cli/src/mentat_cli/repl.rs
View file

@ -52,21 +52,22 @@ impl Repl {
/// Runs the REPL interactively.
pub fn run(&mut self) {
let mut more: Option<Command> = None;
let mut more = false;
let mut input = InputReader::new();
loop {
let res = input.read_input(more.clone());
let res = input.read_input();
match res {
Ok(MetaCommand(cmd)) => {
debug!("read command: {:?}", cmd);
more = None;
more = false;
self.handle_command(cmd);
},
Ok(Empty) => (),
Ok(More(cmd)) => { more = Some(cmd); },
Ok(Empty) => more = false,
Ok(More) => { more = true; },
Ok(Eof) => {
more = false;
if input.is_tty() {
println!("");
}