initial commit
This commit is contained in:
commit
d7b6642e92
91
build.zig
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91
build.zig
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const std = @import("std");
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// Although this function looks imperative, note that its job is to
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// declaratively construct a build graph that will be executed by an external
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// runner.
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pub fn build(b: *std.Build) void {
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// Standard target options allows the person running `zig build` to choose
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// what target to build for. Here we do not override the defaults, which
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// means any target is allowed, and the default is native. Other options
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// for restricting supported target set are available.
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const target = b.standardTargetOptions(.{});
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// Standard optimization options allow the person running `zig build` to select
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// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
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// set a preferred release mode, allowing the user to decide how to optimize.
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const optimize = b.standardOptimizeOption(.{});
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const lib = b.addStaticLibrary(.{
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.name = "sqlite",
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// In this case the main source file is merely a path, however, in more
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// complicated build scripts, this could be a generated file.
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.root_source_file = .{ .path = "src/root.zig" },
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.target = target,
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.optimize = optimize,
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});
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// This declares intent for the library to be installed into the standard
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// location when the user invokes the "install" step (the default step when
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// running `zig build`).
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b.installArtifact(lib);
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const exe = b.addExecutable(.{
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.name = "sqlite",
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.root_source_file = .{ .path = "src/main.zig" },
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.target = target,
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.optimize = optimize,
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});
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// This declares intent for the executable to be installed into the
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// standard location when the user invokes the "install" step (the default
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// step when running `zig build`).
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b.installArtifact(exe);
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// This *creates* a Run step in the build graph, to be executed when another
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// step is evaluated that depends on it. The next line below will establish
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// such a dependency.
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const run_cmd = b.addRunArtifact(exe);
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// By making the run step depend on the install step, it will be run from the
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// installation directory rather than directly from within the cache directory.
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// This is not necessary, however, if the application depends on other installed
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// files, this ensures they will be present and in the expected location.
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run_cmd.step.dependOn(b.getInstallStep());
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// This allows the user to pass arguments to the application in the build
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// command itself, like this: `zig build run -- arg1 arg2 etc`
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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// This creates a build step. It will be visible in the `zig build --help` menu,
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// and can be selected like this: `zig build run`
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// This will evaluate the `run` step rather than the default, which is "install".
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const run_step = b.step("run", "Run the app");
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run_step.dependOn(&run_cmd.step);
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// Creates a step for unit testing. This only builds the test executable
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// but does not run it.
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const lib_unit_tests = b.addTest(.{
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.root_source_file = .{ .path = "src/root.zig" },
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.target = target,
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.optimize = optimize,
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});
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const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
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const exe_unit_tests = b.addTest(.{
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.root_source_file = .{ .path = "src/main.zig" },
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.target = target,
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.optimize = optimize,
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});
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const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
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// Similar to creating the run step earlier, this exposes a `test` step to
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// the `zig build --help` menu, providing a way for the user to request
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// running the unit tests.
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const test_step = b.step("test", "Run unit tests");
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test_step.dependOn(&run_lib_unit_tests.step);
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test_step.dependOn(&run_exe_unit_tests.step);
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}
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62
build.zig.zon
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62
build.zig.zon
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.{
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.name = "sqlite",
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// This is a [Semantic Version](https://semver.org/).
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// In a future version of Zig it will be used for package deduplication.
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.version = "0.0.0",
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// This field is optional.
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// This is currently advisory only; Zig does not yet do anything
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// with this value.
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//.minimum_zig_version = "0.11.0",
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// This field is optional.
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// Each dependency must either provide a `url` and `hash`, or a `path`.
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// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
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// Once all dependencies are fetched, `zig build` no longer requires
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// internet connectivity.
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.dependencies = .{
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// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
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//.example = .{
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// // When updating this field to a new URL, be sure to delete the corresponding
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// // `hash`, otherwise you are communicating that you expect to find the old hash at
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// // the new URL.
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// .url = "https://example.com/foo.tar.gz",
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//
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// // This is computed from the file contents of the directory of files that is
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// // obtained after fetching `url` and applying the inclusion rules given by
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// // `paths`.
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// //
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// // This field is the source of truth; packages do not come from a `url`; they
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// // come from a `hash`. `url` is just one of many possible mirrors for how to
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// // obtain a package matching this `hash`.
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// //
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// // Uses the [multihash](https://multiformats.io/multihash/) format.
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// .hash = "...",
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//
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// // When this is provided, the package is found in a directory relative to the
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// // build root. In this case the package's hash is irrelevant and therefore not
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// // computed. This field and `url` are mutually exclusive.
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// .path = "foo",
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//},
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},
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// Specifies the set of files and directories that are included in this package.
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// Only files and directories listed here are included in the `hash` that
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// is computed for this package.
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// Paths are relative to the build root. Use the empty string (`""`) to refer to
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// the build root itself.
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// A directory listed here means that all files within, recursively, are included.
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.paths = .{
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// This makes *all* files, recursively, included in this package. It is generally
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// better to explicitly list the files and directories instead, to insure that
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// fetching from tarballs, file system paths, and version control all result
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// in the same contents hash.
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"",
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// For example...
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//"build.zig",
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//"build.zig.zon",
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//"src",
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//"LICENSE",
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//"README.md",
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},
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}
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127
src/main.zig
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127
src/main.zig
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const std = @import("std");
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const heap = std.heap;
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const InputBuffer = struct { buffer: [*]u8, buffer_length: usize, input_length: usize };
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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const MetaCommandError = error{UNRECOGNIZED_COMMAND};
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const PrepareResultError = error{ UNRECOGNIZED_STATEMENT, SYNTAX_ERROR };
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const COLUMN_USERNAME_SIZE = 32;
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const COLUMN_EMAIL_SIZE = 255;
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const Row = struct { id: i16, username: [COLUMN_USERNAME_SIZE]u8, email: [COLUMN_EMAIL_SIZE]u8 };
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const StatementType = enum { INSERT, SELECT };
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const Statement = struct { type: StatementType, row_to_insert: Row };
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pub fn new_input_buffer() !*InputBuffer {
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const input_buffers = try allocator.alloc(InputBuffer, 1);
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const input_buffer = &input_buffers[0];
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input_buffer.buffer = undefined;
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input_buffer.buffer_length = 0;
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input_buffer.input_length = 0;
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return input_buffer;
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}
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pub fn main() !void {
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const input_buffer: *InputBuffer = try new_input_buffer();
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// defer std.heap.page_allocator.free(input_buffer);
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const stdout_file = std.io.getStdOut().writer();
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var bw = std.io.bufferedWriter(stdout_file);
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const stdout = bw.writer();
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_ = stdout; // autofix
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while (true) {
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print_prompt();
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try read_input(input_buffer);
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const command = input_buffer.buffer[0 .. input_buffer.buffer_length - 1];
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if (input_buffer.buffer[0] == '.') {
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do_meta_command(command) catch |err| {
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switch (err) {
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MetaCommandError.UNRECOGNIZED_COMMAND => {
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std.debug.print("Unrecognized command {s}\n", .{input_buffer.buffer[0 .. input_buffer.buffer_length - 1]});
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continue;
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},
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}
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};
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}
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var statement: Statement = (try allocator.alloc(Statement, 1))[0];
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prepare_statement(input_buffer.*, &statement) catch |err| {
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switch (err) {
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PrepareResultError.UNRECOGNIZED_STATEMENT => {
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std.debug.print("Unrecognized keyword at start of {s}\n", .{command});
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continue;
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},
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}
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};
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execute_statement(&statement);
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}
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}
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pub fn print_prompt() void {
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std.debug.print("db > ", .{});
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}
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pub fn read_input(input_buffer: *InputBuffer) !void {
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const stdin = std.io.getStdIn().reader();
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const tempInput = try allocator.alloc(u8, 256);
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if (stdin.read(tempInput)) |input_size| {
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input_buffer.buffer_length = input_size;
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input_buffer.buffer = tempInput.ptr;
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input_buffer.input_length = input_buffer.buffer_length - 1;
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input_buffer.buffer[input_buffer.buffer_length - 1] = 0;
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} else |err| {
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return err;
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}
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}
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pub fn close_input_buffer(input_buffer: *InputBuffer) void {
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allocator.free(input_buffer);
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}
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pub fn do_meta_command(command: []u8) MetaCommandError!void {
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if (std.mem.eql(u8, command, ".exit")) {
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std.os.exit(0);
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return;
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} else {
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return MetaCommandError.UNRECOGNIZED_COMMAND;
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}
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}
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pub fn prepare_statement(input_buffer: InputBuffer, statement: *Statement) PrepareResultError!void {
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if (std.mem.eql(u8, input_buffer.buffer[0..6], "insert")) {
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statement.type = StatementType.INSERT;
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return;
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}
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if (std.mem.eql(u8, input_buffer.buffer[0..6], "select")) {
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statement.type = StatementType.SELECT;
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return;
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}
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return PrepareResultError.UNRECOGNIZED_STATEMENT;
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}
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pub fn execute_statement(statement: *Statement) void {
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switch (statement.type) {
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StatementType.INSERT => {
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std.debug.print("Your insert command would go here\n", .{});
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},
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StatementType.SELECT => {
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std.debug.print("Your select command would go here\n", .{});
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},
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}
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}
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2
src/root.zig
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2
src/root.zig
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const std = @import("std");
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