commit d7b6642e92f18df6f406168633c2b147e27b0a9a Author: Omer Sabic Date: Fri Feb 2 14:03:53 2024 +0100 initial commit diff --git a/build.zig b/build.zig new file mode 100644 index 0000000..6dc20ad --- /dev/null +++ b/build.zig @@ -0,0 +1,91 @@ +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); +} diff --git a/build.zig.zon b/build.zig.zon new file mode 100644 index 0000000..dd4477f --- /dev/null +++ b/build.zig.zon @@ -0,0 +1,62 @@ +.{ + .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 ` 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", + }, +} diff --git a/src/main.zig b/src/main.zig new file mode 100644 index 0000000..004b5cc --- /dev/null +++ b/src/main.zig @@ -0,0 +1,127 @@ +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", .{}); + }, + } +} diff --git a/src/root.zig b/src/root.zig new file mode 100644 index 0000000..b31ab7d --- /dev/null +++ b/src/root.zig @@ -0,0 +1,2 @@ +const std = @import("std"); +