Supersedes #3805. Here is a comparison of master, #3805 and this commit:
# master
$ bin/coffee
coffee> 1 %% 2
TypeError: Array.prototype.indexOf called on null or undefined
# #3805
$ bin/coffee
coffee> 1 %% 2
1
coffee> (_results = null; i) for i in [1, 2, 3]
TypeError: Cannot call method 'push' of null
# this commit
$ bin/coffee
coffee> 1 %% 2
1
coffee> (_results = null; i) for i in [1, 2, 3]
[ 1, 2, 3 ]
- Fix#3394: Unclosed single-quoted strings (both regular ones and heredocs)
used to pass through the lexer, causing a parsing error later, while
double-quoted strings caused an error already in the lexing phase. Now both
single and double-quoted unclosed strings error out in the lexer (which is the
more logical option) with consistent error messages. This also fixes the last
comment by @satyr in #3301.
- Similar to the above, unclosed heregexes also used to pass through the lexer
and not error until in the parsing phase, which resulted in confusing error
messages. This has been fixed, too.
- Fix#3348, by adding passing tests.
- Fix#3529: If a string starts with an interpolation, an empty string is no
longer emitted before the interpolation (unless it is needed to coerce the
interpolation into a string).
- Block comments cannot contain `*/`. Now the error message also shows exactly
where the offending `*/`. This improvement might seem unrelated, but I had to
touch that code anyway to refactor string and regex related code, and the
change was very trivial. Moreover, it's consistent with the next two points.
- Regexes cannot start with `*`. Now the error message also shows exactly where
the offending `*` is. (It might actually not be exatly at the start in
heregexes.) It is a very minor improvement, but it was trivial to add.
- Octal escapes in strings are forbidden in CoffeeScript (just like in
JavaScript strict mode). However, this used to be the case only for regular
strings. Now they are also forbidden in heredocs. Moreover, the errors now
point at the offending octal escape.
- Invalid regex flags are no longer allowed. This includes repeated modifiers
and unknown ones. Moreover, invalid modifiers do not stop a heregex from
being matched, which results in better error messages.
- Fix#3621: `///a#{1}///` compiles to `RegExp("a" + 1)`. So does
`RegExp("a#{1}")`. Still, those two code snippets used to generate different
tokens, which is a bit weird, but more importantly causes problems for
coffeelint (see clutchski/coffeelint#340). This required lots of tests in
test/location.coffee to be updated. Note that some updates to those tests are
unrelated to this point; some have been updated to be more consistent (I
discovered this because the refactored code happened to be seemingly more
correct).
- Regular regex literals used to erraneously allow newlines to be escaped,
causing invalid JavaScript output. This has been fixed.
- Heregexes may now be completely empty (`//////`), instead of erroring out with
a confusing message.
- Fix#2388: Heredocs and heregexes used to be lexed simply, which meant that
you couldn't nest a heredoc within a heredoc (double-quoted, that is) or a
heregex inside a heregex.
- Fix#2321: If you used division inside interpolation and then a slash later in
the string containing that interpolation, the division slash and the latter
slash was erraneously matched as a regex. This has been fixed.
- Indentation inside interpolations in heredocs no longer affect how much
indentation is removed from each line of the heredoc (which is more
intuitive).
- Whitespace is now correctly trimmed from the start and end of strings in a few
edge cases.
- Last but not least, the lexing of interpolated strings now seems to be more
efficient. For a regular double-quoted string, we used to use a custom
function to find the end of it (taking interpolations and interpolations
within interpolations etc. into account). Then we used to re-find the
interpolations and recursively lex their contents. In effect, the same string
was processed twice, or even more in the case of deeper nesting of
interpolations. Now the same string is processed just once.
- Code duplication between regular strings, heredocs, regular regexes and
heregexes has been reduced.
- The above two points should result in more easily read code, too.
Node changed their repl so that it inherits from readline.Interface.
This means that `prompt` is now the rli function and not the original
prompt string. This may be a little hacky, but I figure it would give
someone a start if they want to do a better fix.
The commit that changed this in Node is joyent/node@3ae0b17c76
This bug was mentioned in Issue #3395.
Note that, at least for now, CoffeeScript's own REPL *CLI* still uses a
non-global context, rendering modules such as `color`, which attempt to
modify the prototypes of JavaScript primitives, ineffective. By
contrast, node's own CLI does use the global context.
Instead of throwing the syntax errors with their source file location and needing to then catch them and call a `prettyErrorMessage` function in order to get the formatted error message, now syntax errors know how to pretty-print themselves (their `toString` method gets overridden).
An intermediate `catch` & re-`throw` is needed at the level of `CoffeeScript.compile` and friends. But the benefit of this approach is that now libraries that use the `CoffeeScript` object directly don't need to bother catching the possible compilation errors and calling a special function in order to get the nice error messages; they can just print the error itself (or let it bubble up) and the error will know how to pretty-print itself.
The history file was set to close on process exit, when it
should close on REPL exit. Listening to the process exit
event causes a warning when more than 10 CoffeeScript REPL
instances are opened in the same program, which happens in
the test.
remove unnecessary parens and else statement in repl
we do this by convention of the main coffee source
fix: exit should be process.exit
compiled and build full
Since the move to the nodeREPL package, input lines to be evaluated are
now wrapped in parentheses; that is:
'foo'
would become:
('foo'
)
The old way of detecting empty lines was to see if the input string was
either totally empty, or whitespace-only. The addition of these
parentheses breaks that.
In order to fix this, we simply tweak the regex a little to ignore these
added parentheses if they're present. As an added bonus, the regex
should match empty inputs even if they aren't.
This also makes the "empty command evaluates to undefined" test pass,
for the right reasons (i.e. not because of the broken error behavior
from before).
