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repl: Catch syntax errors better 

Replace the growing list of 'isSyntaxError' whackamole conditions with a
smarter approach.  This creates a vm Script object *first*, which will
parse the code and raise a SyntaxError right away.

We still do need the test function, but only because strict mode syntax
errors are not recoverable, and should be raised right away.  Really, we
should probably *only* continue on "unexpected end of input" SyntaxErrors.

Also fixes a very difficult-to-test nit where the '...' indentation is
not properly cleared when you ^C out of a syntax error.

Closes #6093
v0.11.7-release
isaacs 12 years ago
parent
7494c84fe6
commit
4631c503e3
2 changed files with 44 additions and 37 deletions
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  1. 38
      lib/repl.js
  2. 33
      test/simple/test-repl.js

38
lib/repl.js
View File

@ -111,22 +111,29 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
function defaultEval(code, context, file, cb) {
var err, result;
// first, create the Script object to check the syntax
try {
if (self.useGlobal) {
result = vm.runInThisContext(code, {
var script = vm.createScript(code, {
filename: file,
displayErrors: false
});
} catch (e) {
err = e;
err._isSyntaxError = isSyntaxError(err);
}
if (!err) {
try {
if (self.useGlobal) {
result = script.runInThisContext({ displayErrors: false });
} else {
result = vm.runInContext(code, context, {
filename: file,
displayErrors: false
});
result = script.runInContext(context, { displayErrors: false });
}
} catch (e) {
err = e;
err._isSyntaxError = false;
}
}
if (err && process.domain && !isSyntaxError(err)) {
if (err && process.domain && !err._isSyntaxError) {
process.domain.emit('error', err);
process.domain.exit();
}
@ -140,6 +147,7 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
self._domain.on('error', function(e) {
self.outputStream.write((e.stack || e) + '\n');
self.bufferedCommand = '';
self.lines.level = [];
self.displayPrompt();
});
@ -165,6 +173,7 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
self.resetContext();
self.bufferedCommand = '';
self.lines.level = [];
self.prompt = !util.isUndefined(prompt) ? prompt : '> ';
@ -222,6 +231,7 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
}
self.bufferedCommand = '';
self.lines.level = [];
self.displayPrompt();
});
@ -260,7 +270,7 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
self.context,
'repl',
function(e, ret) {
if (e && !isSyntaxError(e)) return finish(e);
if (e && !e._isSyntaxError) return finish(e);
if (util.isFunction(ret) &&
/^[\r\n\s]*function/.test(evalCmd) || e) {
@ -280,7 +290,7 @@ function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
self.memory(cmd);
// If error was SyntaxError and not JSON.parse error
if (isSyntaxError(e)) {
if (e && e._isSyntaxError) {
if (!self.bufferedCommand && cmd.trim().match(/^npm /)) {
self.outputStream.write('npm should be run outside of the ' +
'node repl, in your normal shell.\n' +
@ -932,18 +942,12 @@ REPLServer.prototype.convertToContext = function(cmd) {
/**
* Returns `true` if "e" is a SyntaxError, `false` otherwise.
* This function filters out false positives likes JSON.parse() errors and
* RegExp syntax errors.
* filters out strict-mode errors, which are not recoverable
*/
function isSyntaxError(e) {
// Convert error to string
e = e && (e.stack || e.toString());
return e && e.match(/^SyntaxError/) &&
// RegExp syntax error
!e.match(/^SyntaxError: Invalid regular expression/) &&
!e.match(/^SyntaxError: Invalid flags supplied to RegExp constructor/) &&
// "strict mode" syntax errors
!e.match(/^SyntaxError: .*strict mode.*/i) &&
// JSON.parse() error
!e.match(/\n {4}at Object.parse \(native\)\n/);
!e.match(/^SyntaxError: .*strict mode.*/i);
}

33
test/simple/test-repl.js
View File

@ -40,7 +40,7 @@ var net = require('net'),
// absolute path to test/fixtures/a.js
var moduleFilename = require('path').join(common.fixturesDir, 'a');
common.error('repl test');
console.error('repl test');
// function for REPL to run
invoke_me = function(arg) {
@ -51,7 +51,7 @@ function send_expect(list) {
if (list.length > 0) {
var cur = list.shift();
common.error('sending ' + JSON.stringify(cur.send));
console.error('sending ' + JSON.stringify(cur.send));
cur.client.expect = cur.expect;
cur.client.list = list;
@ -74,7 +74,7 @@ function error_test() {
client_unix.on('data', function(data) {
read_buffer += data.toString('ascii', 0, data.length);
common.error('Unix data: ' + JSON.stringify(read_buffer) + ', expecting ' +
console.error('Unix data: ' + JSON.stringify(read_buffer) + ', expecting ' +
(client_unix.expect.exec ?
client_unix.expect :
JSON.stringify(client_unix.expect)));
@ -83,13 +83,13 @@ function error_test() {
// if it's an exact match, then don't do the regexp
if (read_buffer !== client_unix.expect) {
assert.ok(read_buffer.match(client_unix.expect));
common.error('match');
console.error('match');
}
read_buffer = '';
if (client_unix.list && client_unix.list.length > 0) {
send_expect(client_unix.list);
} else {
common.error('End of Error test, running TCP test.');
console.error('End of Error test, running TCP test.');
tcp_test();
}
@ -100,12 +100,12 @@ function error_test() {
if (client_unix.list && client_unix.list.length > 0) {
send_expect(client_unix.list);
} else {
common.error('End of Error test, running TCP test.\n');
console.error('End of Error test, running TCP test.\n');
tcp_test();
}
} else {
common.error('didn\'t see prompt yet, buffering.');
console.error('didn\'t see prompt yet, buffering.');
}
});
@ -119,6 +119,9 @@ function error_test() {
// You can recover with the .break command
{ client: client_unix, send: '.break',
expect: prompt_unix },
// But passing the same string to eval() should throw
{ client: client_unix, send: 'eval("function test_func() {")',
expect: /^SyntaxError: Unexpected end of input/ },
// Floating point numbers are not interpreted as REPL commands.
{ client: client_unix, send: '.1234',
expect: '0.1234' },
@ -233,20 +236,20 @@ function tcp_test() {
client_tcp.on('data', function(data) {
read_buffer += data.toString('ascii', 0, data.length);
common.error('TCP data: ' + JSON.stringify(read_buffer) +
console.error('TCP data: ' + JSON.stringify(read_buffer) +
', expecting ' + JSON.stringify(client_tcp.expect));
if (read_buffer.indexOf(prompt_tcp) !== -1) {
assert.strictEqual(client_tcp.expect, read_buffer);
common.error('match');
console.error('match');
read_buffer = '';
if (client_tcp.list && client_tcp.list.length > 0) {
send_expect(client_tcp.list);
} else {
common.error('End of TCP test.\n');
console.error('End of TCP test.\n');
clean_up();
}
} else {
common.error('didn\'t see prompt yet, buffering');
console.error('didn\'t see prompt yet, buffering');
}
});
@ -302,20 +305,20 @@ function unix_test() {
client_unix.on('data', function(data) {
read_buffer += data.toString('ascii', 0, data.length);
common.error('Unix data: ' + JSON.stringify(read_buffer) +
console.error('Unix data: ' + JSON.stringify(read_buffer) +
', expecting ' + JSON.stringify(client_unix.expect));
if (read_buffer.indexOf(prompt_unix) !== -1) {
assert.strictEqual(client_unix.expect, read_buffer);
common.error('match');
console.error('match');
read_buffer = '';
if (client_unix.list && client_unix.list.length > 0) {
send_expect(client_unix.list);
} else {
common.error('End of Unix test, running Error test.\n');
console.error('End of Unix test, running Error test.\n');
process.nextTick(error_test);
}
} else {
common.error('didn\'t see prompt yet, buffering.');
console.error('didn\'t see prompt yet, buffering.');
}
});

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