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Omer Sabic 2024-02-02 14:03:53 +01:00
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91
build.zig Normal file
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const std = @import("std");
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
const lib = b.addStaticLibrary(.{
.name = "sqlite",
// In this case the main source file is merely a path, however, in more
// complicated build scripts, this could be a generated file.
.root_source_file = .{ .path = "src/root.zig" },
.target = target,
.optimize = optimize,
});
// This declares intent for the library to be installed into the standard
// location when the user invokes the "install" step (the default step when
// running `zig build`).
b.installArtifact(lib);
const exe = b.addExecutable(.{
.name = "sqlite",
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
// Creates a step for unit testing. This only builds the test executable
// but does not run it.
const lib_unit_tests = b.addTest(.{
.root_source_file = .{ .path = "src/root.zig" },
.target = target,
.optimize = optimize,
});
const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
const exe_unit_tests = b.addTest(.{
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
// Similar to creating the run step earlier, this exposes a `test` step to
// the `zig build --help` menu, providing a way for the user to request
// running the unit tests.
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&run_lib_unit_tests.step);
test_step.dependOn(&run_exe_unit_tests.step);
}

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build.zig.zon Normal file
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.{
.name = "sqlite",
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// This field is optional.
// This is currently advisory only; Zig does not yet do anything
// with this value.
//.minimum_zig_version = "0.11.0",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package.
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
// This makes *all* files, recursively, included in this package. It is generally
// better to explicitly list the files and directories instead, to insure that
// fetching from tarballs, file system paths, and version control all result
// in the same contents hash.
"",
// For example...
//"build.zig",
//"build.zig.zon",
//"src",
//"LICENSE",
//"README.md",
},
}

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const std = @import("std");
const heap = std.heap;
const InputBuffer = struct { buffer: [*]u8, buffer_length: usize, input_length: usize };
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
const MetaCommandError = error{UNRECOGNIZED_COMMAND};
const PrepareResultError = error{ UNRECOGNIZED_STATEMENT, SYNTAX_ERROR };
const COLUMN_USERNAME_SIZE = 32;
const COLUMN_EMAIL_SIZE = 255;
const Row = struct { id: i16, username: [COLUMN_USERNAME_SIZE]u8, email: [COLUMN_EMAIL_SIZE]u8 };
const StatementType = enum { INSERT, SELECT };
const Statement = struct { type: StatementType, row_to_insert: Row };
pub fn new_input_buffer() !*InputBuffer {
const input_buffers = try allocator.alloc(InputBuffer, 1);
const input_buffer = &input_buffers[0];
input_buffer.buffer = undefined;
input_buffer.buffer_length = 0;
input_buffer.input_length = 0;
return input_buffer;
}
pub fn main() !void {
const input_buffer: *InputBuffer = try new_input_buffer();
// defer std.heap.page_allocator.free(input_buffer);
const stdout_file = std.io.getStdOut().writer();
var bw = std.io.bufferedWriter(stdout_file);
const stdout = bw.writer();
_ = stdout; // autofix
while (true) {
print_prompt();
try read_input(input_buffer);
const command = input_buffer.buffer[0 .. input_buffer.buffer_length - 1];
if (input_buffer.buffer[0] == '.') {
do_meta_command(command) catch |err| {
switch (err) {
MetaCommandError.UNRECOGNIZED_COMMAND => {
std.debug.print("Unrecognized command {s}\n", .{input_buffer.buffer[0 .. input_buffer.buffer_length - 1]});
continue;
},
}
};
}
var statement: Statement = (try allocator.alloc(Statement, 1))[0];
prepare_statement(input_buffer.*, &statement) catch |err| {
switch (err) {
PrepareResultError.UNRECOGNIZED_STATEMENT => {
std.debug.print("Unrecognized keyword at start of {s}\n", .{command});
continue;
},
}
};
execute_statement(&statement);
}
}
pub fn print_prompt() void {
std.debug.print("db > ", .{});
}
pub fn read_input(input_buffer: *InputBuffer) !void {
const stdin = std.io.getStdIn().reader();
const tempInput = try allocator.alloc(u8, 256);
if (stdin.read(tempInput)) |input_size| {
input_buffer.buffer_length = input_size;
input_buffer.buffer = tempInput.ptr;
input_buffer.input_length = input_buffer.buffer_length - 1;
input_buffer.buffer[input_buffer.buffer_length - 1] = 0;
} else |err| {
return err;
}
}
pub fn close_input_buffer(input_buffer: *InputBuffer) void {
allocator.free(input_buffer);
}
pub fn do_meta_command(command: []u8) MetaCommandError!void {
if (std.mem.eql(u8, command, ".exit")) {
std.os.exit(0);
return;
} else {
return MetaCommandError.UNRECOGNIZED_COMMAND;
}
}
pub fn prepare_statement(input_buffer: InputBuffer, statement: *Statement) PrepareResultError!void {
if (std.mem.eql(u8, input_buffer.buffer[0..6], "insert")) {
statement.type = StatementType.INSERT;
return;
}
if (std.mem.eql(u8, input_buffer.buffer[0..6], "select")) {
statement.type = StatementType.SELECT;
return;
}
return PrepareResultError.UNRECOGNIZED_STATEMENT;
}
pub fn execute_statement(statement: *Statement) void {
switch (statement.type) {
StatementType.INSERT => {
std.debug.print("Your insert command would go here\n", .{});
},
StatementType.SELECT => {
std.debug.print("Your select command would go here\n", .{});
},
}
}

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const std = @import("std");