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Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).
No functional changes.
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This fixes a bug in the SQL REPL where after a user enters an
unrecognized command, the REPL would not print another "> " prompt and
would not accept any more input.
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Previously, if a user pressed Enter without typing a command at
the SQL REPL, the next line would be automatically indented. This
change makes it so we check if there were any tokens in the command
before applying the indentation logic.
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This change unfortunately cannot be atomically made without a single
commit changing everything.
Most of the important changes are in LibIPC/Connection.cpp,
LibIPC/ServerConnection.cpp and LibCore/LocalServer.cpp.
The notable changes are:
- IPCCompiler now generates the decode and decode_message functions such
that they take a Core::Stream::LocalSocket instead of the socket fd.
- IPC::Decoder now uses the receive_fd method of LocalSocket instead of
doing system calls directly on the fd.
- IPC::ConnectionBase and related classes now use the Stream API
functions.
- IPC::ServerConnection no longer constructs the socket itself; instead,
a convenience macro, IPC_CLIENT_CONNECTION, is used in place of
C_OBJECT and will generate a static try_create factory function for
the ServerConnection subclass. The subclass is now responsible for
passing the socket constructed in this function to its
ServerConnection base; the socket is passed as the first argument to
the constructor (as a NonnullOwnPtr<Core::Stream::LocalServer>) before
any other arguments.
- The functionality regarding taking over sockets from SystemServer has
been moved to LibIPC/SystemServerTakeover.cpp. The Core::LocalSocket
implementation of this functionality hasn't been deleted due to my
intention of removing this class in the near future and to reduce
noise on this (already quite noisy) PR.
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Add a number of command line switches:
- '-r/--read': Read a SQL file and quit the REPL when done
- '-s/--source': Read a SQL file and return to a SQL prompt when done
- '--no-sqlrc': Do not read ~/.sqlrc on startup (see below)
Add a dot-command:
.read <filename>: Read a SQL file and return to a SQL prompt when done
In addition, the sql REPL will source the ~/.sqlrc file on startup if
it exists, unless the --no-sqlrc flag is set on startup.
Note the slight asymmetry between the --read command line flag (which
results in the program quitting when the file is read) and the .read
command (which doesn't cause a quit).
Also fix merge conflict with #10091
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The existing input loop called the `read_sql` method recursively. This
lead to strange behaviour in the event loop. This is solved by
encapsulating the REPL in an object and ensuring the `read_sql` method
is not called recursively. The method now returns after the first
recognized SQL statement or command.
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You can now connect to a different database using the .connect meta
command.
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The database the sql client connected to was 'hardcoded' to the login
name of the calling user.
- Extended the IPC API to be more expressive when connecting, by
returning the name of the database the client connected to in the
'connected' callback.
- Gave the sql client a command line argument (-d/--database) allowing
an alternative database name to be specified
A subsequent commit will have a dot command allowing the user to
connect to different databases from the same sql session.
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Previously, a String literal token like 'hello' had every char
highlighted but for the last 'o' and the closing single quote. This is
because the token start is at the opening single quote but the `length`
variable only accounted for the value length without the single quotes.
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Command used:
grep -Pirn '(out|warn)ln\((?!["\)]|format,|stderr,|stdout,|output, ")' \
AK Kernel/ Tests/ Userland/
(Plus some manual reviewing.)
Let's pick ArgsParser as an example:
outln(file, m_general_help);
This will fail at runtime if the general help happens to contain braces.
Even if this transformation turns out to be unnecessary in a place or
two, this way the code is "more obviously" correct.
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- Added a connection banner
- Added '.quit' synonym for '.exit'
- Do not display updated/created/deleted banner if there were no changes
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This allows the utility to connect to databases and submit SQL
statements.
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We already do this in most places, so the style should be consistent.
Also, Clang does not like it, as this could cause an unexpected compile
error if some statements are added to the default label or a new label
is added above it.
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SQL was standardized before there was consensus on sane language syntax
constructs had evolved. The language is mostly case-insensitive, with
unquoted text converted to upper case. Identifiers can include lower
case characters and other 'special' characters by enclosing the
identifier with double quotes. A double quote is escaped by doubling it.
Likewise, a single quote in a literal string is escaped by doubling it.
All this means that the strategy used in the lexer, where a token's
value is a StringView 'window' on the source string, does not work,
because the value needs to be massaged before being handed to the
parser. Therefore a token now has a String containing its value. Given
the limited lifetime of a token, this is acceptable overhead.
Not doing this means that for example quote removal and double quote
escaping would need to be done in the parser or in AST node
construction, which would spread lexing basically all over the place.
Which would be suboptimal.
There was some impact on the sql utility and SyntaxHighlighter component
which was addressed by storing the token's end position together with
the start position in order to properly highlight it.
Finally, reviewing the tests for parsing numeric literals revealed an
inconsistency in which tokens we accept or reject: `1a` is accepted but
`1e` is rejected. Related to this is the fate of `0x`. Added a FIXME
reminding us to address this.
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The SQL engine is expected to be a fairly sizeable piece of software.
Therefore we're starting to restructure the codebase for growth.
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SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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This adds a simple REPL command line utility for (eventually) executing
SQL statements / files. Currently, it just validates statements from
stdin and prints any errors.
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