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Copy pathrepl.rs
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595 lines (532 loc) · 19.5 KB
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use crate::db::Minigraf;
use std::io::{self, BufRead, IsTerminal, Write};
/// An interactive REPL for a [`Minigraf`] database.
///
/// Construct via [`Minigraf::repl`] and call [`Repl::run`] to start the session.
pub struct Repl<'a> {
db: &'a Minigraf,
}
impl<'a> Repl<'a> {
pub(crate) fn new(db: &'a Minigraf) -> Self {
Repl { db }
}
/// Start the interactive REPL loop.
///
/// Reads Datalog commands from stdin line-by-line. When stdin is a TTY,
/// a banner and prompts are printed; when piped, output is suppressed so
/// the REPL can be driven by scripts.
pub fn run(&self) {
let interactive = io::stdin().is_terminal();
self.run_impl(io::BufReader::new(io::stdin()), interactive);
}
/// Source `init_path` silently, without starting the interactive loop.
///
/// Commands in the init file are executed exactly as if they had been
/// typed at the prompt, but without any banner or prompts. Errors are
/// printed to stderr and execution of the init file continues. Call
/// [`Repl::run`] afterwards to start the interactive REPL.
pub fn run_with_init(&self, init_path: &std::path::Path) {
match std::fs::File::open(init_path) {
Ok(file) => {
self.run_impl(io::BufReader::new(file), false);
}
Err(e) => {
let path = init_path.display();
eprintln!("error: could not open init file '{path}': {e}");
}
}
}
fn run_impl<R: BufRead>(&self, mut reader: R, interactive: bool) {
if interactive {
println!(
"Minigraf v{} - Interactive Datalog Console",
env!("CARGO_PKG_VERSION")
);
println!();
println!("Data operations:");
println!(" (transact [...]) - assert facts");
println!(" (transact {{:valid-from ... :valid-to ...}} [...]) - with valid time");
println!(" (retract [...]) - retract facts");
println!();
println!("Queries:");
println!(" (query [:find ?x :where ...]) - basic query");
println!(" (rule [(name ?a ?b) [?a :attr ?b]]) - define a rule");
println!();
println!("Temporal queries:");
println!(
" (query [:find ?x :as-of 50 :where ...]) - state as of tx counter 50"
);
println!(
" (query [:find ?x :as-of \"2024-01-15T10:00:00Z\" :where ...]) - state as of UTC timestamp"
);
println!(
" (query [:find ?x :valid-at \"2023-06-01\" :where ...]) - facts valid on date"
);
println!(
" (query [:find ?x :valid-at :any-valid-time :where ...]) - all facts, ignoring validity"
);
println!();
println!("Note: queries without :valid-at return only currently valid facts.");
println!();
println!("Type EXIT to quit.\n");
}
let mut command_buffer = String::new();
let mut is_multiline = false;
// Only print the prompt once per command, not once per blank/comment line.
let mut prompt_needed = true;
loop {
if interactive && !is_multiline && prompt_needed {
print!("minigraf> ");
io::stdout().flush().ok();
prompt_needed = false;
}
let mut input = String::new();
match reader.read_line(&mut input) {
Ok(n) => {
if n == 0 {
// EOF (Ctrl-D): emit a newline so the shell prompt starts
// on a fresh line rather than appending to the REPL prompt.
if interactive {
println!();
}
break;
}
let line = input.trim();
if line.is_empty() || line.starts_with('#') || line.starts_with(';') {
continue;
}
if line.to_uppercase() == "EXIT" {
break;
}
if !command_buffer.is_empty() {
command_buffer.push('\n');
}
command_buffer.push_str(line);
if Self::is_command_complete(&command_buffer) {
match self.db.execute(&command_buffer) {
Ok(result) => {
Self::print_result(result);
io::stdout().flush().ok();
}
Err(e) => {
eprintln!("Error: {}", e);
}
}
command_buffer.clear();
is_multiline = false;
prompt_needed = true;
if interactive {
println!();
io::stdout().flush().ok();
}
} else {
is_multiline = true;
}
}
Err(e) => {
eprintln!("Error reading input: {}", e);
break;
}
}
}
}
fn is_command_complete(input: &str) -> bool {
let mut depth = 0;
let mut in_string = false;
let mut escape_next = false;
for ch in input.chars() {
if escape_next {
escape_next = false;
continue;
}
match ch {
'\\' if in_string => {
escape_next = true;
}
'"' => {
in_string = !in_string;
}
'(' if !in_string => {
#[allow(clippy::arithmetic_side_effects)]
{
depth += 1;
}
}
')' if !in_string => {
#[allow(clippy::arithmetic_side_effects)]
{
depth -= 1;
}
}
_ => {}
}
}
depth == 0 && input.contains('(')
}
fn print_result(result: crate::query::datalog::QueryResult) {
use crate::query::datalog::QueryResult as DResult;
match result {
DResult::Transacted(tx_id) => {
println!("✓ Transacted successfully (tx: {tx_id})");
}
DResult::Retracted(tx_id) => {
println!("✓ Retracted successfully (tx: {tx_id})");
}
DResult::QueryResults { vars, results } => {
if results.is_empty() {
println!("No results found.");
} else {
println!("{}", vars.join("\t"));
println!("{}", "-".repeat(vars.len().saturating_mul(20)));
for row in &results {
let formatted_row: Vec<String> =
row.iter().map(Self::format_value).collect();
println!("{}", formatted_row.join("\t"));
}
println!("\n{} result(s) found.", results.len());
}
}
DResult::Ok => {
println!("✓ OK");
}
}
}
fn format_value(value: &crate::graph::types::Value) -> String {
use crate::graph::types::Value;
match value {
Value::String(s) => format!("\"{}\"", s),
Value::Integer(i) => i.to_string(),
Value::Float(f) => f.to_string(),
Value::Boolean(b) => b.to_string(),
Value::Ref(uuid) => format!("#uuid {}", uuid),
Value::Keyword(k) => k.clone(),
Value::Null => "nil".to_string(),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::db::Minigraf;
#[test]
fn run_public_method_exits_on_non_tty_stdin() {
// In TTY environments (local dev) stdin.is_terminal() is true and run() would
// block waiting for input — skip the test gracefully. In CI the test binary's
// stdin is a closed pipe, so read_line() returns Ok(0) immediately and run()
// returns after one loop iteration. This exercises the two otherwise-uncovered
// lines in the public `run()` wrapper (is_terminal + run_impl call).
if io::stdin().is_terminal() {
return;
}
let db = Minigraf::in_memory().expect("in-memory db");
db.repl().run();
}
#[test]
fn eof_in_interactive_mode_exits_cleanly() {
// Exercises the `if interactive { println!(); }` branch in the Ok(0) arm.
// An empty Cursor reaches EOF immediately; interactive=true triggers the newline path.
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(std::io::Cursor::new(b""), true);
}
#[test]
fn eof_in_non_interactive_mode_exits_cleanly() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(std::io::Cursor::new(b""), false);
}
#[test]
fn exit_command_terminates_loop() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(std::io::Cursor::new(b"EXIT\n"), false);
}
#[test]
fn comment_and_blank_lines_are_skipped() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(b"# hash comment\n; edn comment\n\nEXIT\n"),
false,
);
}
#[test]
fn query_with_no_results_runs_without_panic() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(b"(query [:find ?e :where [?e :x 1]])\nEXIT\n"),
false,
);
}
#[test]
fn transact_and_query_with_results() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/name \"Widget\"]])\n\
(query [:find ?n :where [_ :item/name ?n]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn retract_command_runs_without_panic() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/name \"Widget\"]])\n\
(retract [[:db/retract \"e1\" :item/name \"Widget\"]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn multiline_command_is_buffered_until_complete() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
// The first line is an incomplete command (unmatched paren); the second
// line completes it — exercises the `is_multiline = true` branch.
repl.run_impl(
std::io::Cursor::new(b"(query [:find ?e\n:where [?e :x 1]])\nEXIT\n"),
false,
);
}
#[test]
fn interactive_mode_prints_output_after_command() {
// interactive=true exercises the `println!()` after a successful command.
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(b"(query [:find ?e :where [?e :x 1]])\nEXIT\n"),
true,
);
}
#[test]
fn read_error_exits_loop() {
struct ErrorReader;
impl std::io::Read for ErrorReader {
fn read(&mut self, _buf: &mut [u8]) -> std::io::Result<usize> {
Err(std::io::Error::new(
std::io::ErrorKind::BrokenPipe,
"simulated read error",
))
}
}
impl std::io::BufRead for ErrorReader {
fn fill_buf(&mut self) -> std::io::Result<&[u8]> {
Err(std::io::Error::new(
std::io::ErrorKind::BrokenPipe,
"simulated read error",
))
}
fn consume(&mut self, _amt: usize) {}
}
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(ErrorReader, false);
}
#[test]
fn query_integer_result_covers_format_value_integer() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/count 42]])\n\
(query [:find ?c :where [_ :item/count ?c]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn query_float_result_covers_format_value_float() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/price 9.99]])\n\
(query [:find ?p :where [_ :item/price ?p]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn query_keyword_result_covers_format_value_keyword() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/status :active]])\n\
(query [:find ?s :where [_ :item/status ?s]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn query_boolean_result_covers_format_value_boolean() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(transact [[:db/add \"e1\" :item/in-stock true]])\n\
(query [:find ?s :where [_ :item/in-stock ?s]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn rule_definition_covers_result_ok_arm() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_impl(
std::io::Cursor::new(
b"(rule [(parent ?x ?y) [?x :parent/of ?y]])\n\
EXIT\n",
),
false,
);
}
#[test]
fn multiline_command_in_interactive_mode_covers_continuation_prompt() {
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
// First line is incomplete (unmatched paren) → no continuation prompt (suppressed in multiline mode).
repl.run_impl(
std::io::Cursor::new(b"(query [:find ?e\n:where [?e :x 1]])\nEXIT\n"),
true,
);
}
// --- Direct tests for print_result ---
#[test]
fn print_result_transacted() {
use crate::query::datalog::QueryResult as DResult;
Repl::print_result(DResult::Transacted(12345678));
}
#[test]
fn print_result_retracted() {
use crate::query::datalog::QueryResult as DResult;
Repl::print_result(DResult::Retracted(12345678));
}
#[test]
fn print_result_ok() {
use crate::query::datalog::QueryResult as DResult;
Repl::print_result(DResult::Ok);
}
#[test]
fn print_result_query_no_results() {
use crate::query::datalog::QueryResult as DResult;
Repl::print_result(DResult::QueryResults {
vars: vec!["?x".to_string()],
results: vec![],
});
}
#[test]
fn print_result_query_with_rows() {
use crate::graph::types::Value;
use crate::query::datalog::QueryResult as DResult;
Repl::print_result(DResult::QueryResults {
vars: vec!["?x".to_string(), "?y".to_string()],
results: vec![vec![Value::String("hello".to_string()), Value::Integer(42)]],
});
}
// --- Direct tests for format_value ---
#[test]
fn format_value_string() {
use crate::graph::types::Value;
assert_eq!(
Repl::format_value(&Value::String("hi".to_string())),
"\"hi\""
);
}
#[test]
fn format_value_integer() {
use crate::graph::types::Value;
assert_eq!(Repl::format_value(&Value::Integer(7)), "7");
}
#[test]
fn format_value_float() {
use crate::graph::types::Value;
assert_eq!(Repl::format_value(&Value::Float(3.14)), "3.14");
}
#[test]
fn format_value_boolean() {
use crate::graph::types::Value;
assert_eq!(Repl::format_value(&Value::Boolean(true)), "true");
}
#[test]
fn format_value_ref() {
use crate::graph::types::Value;
let id = uuid::Uuid::new_v4();
assert_eq!(Repl::format_value(&Value::Ref(id)), format!("#uuid {}", id));
}
#[test]
fn format_value_keyword() {
use crate::graph::types::Value;
assert_eq!(
Repl::format_value(&Value::Keyword(":active".to_string())),
":active"
);
}
#[test]
fn format_value_null() {
use crate::graph::types::Value;
assert_eq!(Repl::format_value(&Value::Null), "nil");
}
// --- Direct tests for is_command_complete ---
#[test]
fn is_command_complete_handles_escaped_quote_in_string() {
// Exercises the `escape_next` branches (lines 135-136, 140-141).
assert!(Repl::is_command_complete(
r#"(query [:find ?x :where [?x :name "he said \"hi\""]])"#
));
}
#[test]
fn is_command_complete_default_arm() {
// A plain character inside a string hits the `_ => {}` arm.
assert!(Repl::is_command_complete(r#"(foo "bar")"#));
}
#[test]
#[cfg(not(target_arch = "wasm32"))]
fn run_with_init_sources_file() {
// run_with_init only processes the init file (no interactive loop), so
// this test is safe to run in any environment without blocking on stdin.
use std::io::Write;
let mut tmp = tempfile::NamedTempFile::new().expect("tempfile");
writeln!(
tmp,
"(transact [[:alice :person/name \"Alice\"]])\n\
(rule [(has-name ?e ?n) [?e :person/name ?n]])"
)
.expect("write init");
tmp.flush().expect("flush");
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_with_init(tmp.path());
let result = db
.execute("(query [:find ?n :where (has-name _ ?n)])")
.expect("query");
match result {
crate::query::datalog::QueryResult::QueryResults { results, .. } => {
assert_eq!(results.len(), 1);
}
_ => panic!("expected query results"),
}
}
#[test]
#[cfg(not(target_arch = "wasm32"))]
fn run_with_init_missing_file_prints_error() {
// A non-existent init path should print an error to stderr but not panic.
// run_with_init no longer starts the interactive loop, so no stdin blocking.
let db = Minigraf::in_memory().expect("in-memory db");
let repl = db.repl();
repl.run_with_init(std::path::Path::new("/nonexistent/path/rules.datalog"));
}
}