This commit is contained in:
parent
c3776846d5
commit
5ae8b48845
120
Cargo.lock
generated
120
Cargo.lock
generated
@ -2,6 +2,126 @@
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# It is not intended for manual editing.
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# It is not intended for manual editing.
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version = 3
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version = 3
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[[package]]
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name = "aho-corasick"
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version = "0.7.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
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dependencies = [
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"memchr",
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]
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[[package]]
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name = "const_format"
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version = "0.2.22"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "22bc6cd49b0ec407b680c3e380182b6ac63b73991cb7602de350352fc309b614"
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dependencies = [
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"const_format_proc_macros",
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]
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[[package]]
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name = "const_format_proc_macros"
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version = "0.2.22"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ef196d5d972878a48da7decb7686eded338b4858fbabeed513d63a7c98b2b82d"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "lazy_static"
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version = "1.4.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
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[[package]]
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name = "memchr"
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version = "2.4.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
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[[package]]
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name = "proc-macro2"
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version = "1.0.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.17"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "632d02bff7f874a36f33ea8bb416cd484b90cc66c1194b1a1110d067a7013f58"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "regex"
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version = "1.5.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
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dependencies = [
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"aho-corasick",
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"memchr",
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"regex-syntax",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.6.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
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[[package]]
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[[package]]
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name = "sqlite_clone"
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name = "sqlite_clone"
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version = "0.1.0"
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version = "0.1.0"
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dependencies = [
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"sscanf",
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]
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[[package]]
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name = "sscanf"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6311683a27f16025db4f8bcf0732662f5fecd1406f53f0aab9adbf6f396f1189"
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dependencies = [
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"const_format",
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"lazy_static",
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"regex",
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"sscanf_macro",
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]
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[[package]]
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name = "sscanf_macro"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0d1d364d856d72a52b518c7669df864bdf177de242bcb5b45369ec33190c91c3"
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dependencies = [
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"proc-macro2",
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"quote",
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"regex-syntax",
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"syn",
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]
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[[package]]
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name = "syn"
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version = "1.0.89"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ea297be220d52398dcc07ce15a209fce436d361735ac1db700cab3b6cdfb9f54"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
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@ -6,3 +6,4 @@ edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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[dependencies]
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sscanf = {version="0.2.1"}
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48
src/main.rs
48
src/main.rs
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mod statement;
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use std::io;
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use std::io;
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use std::io::Write;
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use std::io::Write;
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use std::process::exit;
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use std::process::exit;
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@ -6,33 +8,6 @@ struct InputBuffer {
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buffer: Option<String>,
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buffer: Option<String>,
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}
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}
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enum StatementType {
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Insert,
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Select,
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}
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struct Statement {
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statement_type: StatementType,
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}
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impl Statement {
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fn new(statement_type: StatementType) -> Self {
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Self {
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statement_type
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}
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}
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pub(crate) fn execute(&self) {
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match self.statement_type {
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StatementType::Insert => {
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println!("This is where you do an insert")
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}
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StatementType::Select => {
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println!("This is where you do an select")
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}
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}
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}
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}
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impl InputBuffer {
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impl InputBuffer {
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pub fn new() -> Self {
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pub fn new() -> Self {
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@ -69,10 +44,13 @@ impl InputBuffer {
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if command.starts_with(".") {
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if command.starts_with(".") {
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Self::handle_meta_statement(command);
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Self::handle_meta_statement(command);
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} else {
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} else {
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if let Ok(statement) = Self::prepare_statement(command) {
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match Self::prepare_statement(&command.replace("\n", "")) {
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Ok(statement) => {
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statement.execute()
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statement.execute()
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} else {
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}
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println!("could not recognize statement");
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Err(e) => {
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println!("{}", e);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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fn prepare_statement(command: &String) -> Result<Statement, String> {
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fn prepare_statement(command: &String) -> Result<statement::Statement, String> {
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if command.starts_with("insert") {
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return statement::Statement::parse_statement(command);
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Ok(Statement::new(StatementType::Insert))
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} else if command.starts_with("select") {
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Ok(Statement::new(StatementType::Select))
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} else {
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Err(String::from("Unrecognized statement"))
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}
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}
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}
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fn handle_meta_statement(command: &String) {
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fn handle_meta_statement(command: &String) {
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95
src/statement.rs
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95
src/statement.rs
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use std::io::Write;
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use std::mem::size_of;
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pub enum StatementType {
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Insert {
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row: Row
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},
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Select,
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}
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const COLUMN_USERNAME_SIZE: usize = 32;
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const COLUMN_EMAIL_SIZE: usize = 255;
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pub struct Row {
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id: u32,
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username: [u8; COLUMN_USERNAME_SIZE],
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email: [u8; COLUMN_EMAIL_SIZE],
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}
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impl Row {
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fn new(id: u32, username: String, email: String) -> Result<Self, String> {
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let username_bytes = username.as_bytes();
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let email_bytes = email.as_bytes();
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if username_bytes.len() > COLUMN_USERNAME_SIZE {
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Err(String::from("username is too long"))
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} else if email_bytes.len() > COLUMN_EMAIL_SIZE {
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Err(String::from("email is too long"))
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} else {
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let username_buffer = &mut [0; COLUMN_USERNAME_SIZE];
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if let Err(_) = pad_buffer(username_buffer, username_bytes) {
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panic!("could not pad username buffer")
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}
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let email_buffer = &mut [0; COLUMN_EMAIL_SIZE];
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if let Err(_) = pad_buffer(email_buffer, username_bytes) {
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panic!("could not pad username buffer")
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}
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Ok(Self {
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id,
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username: *username_buffer,
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email: *email_buffer,
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})
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}
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}
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}
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fn pad_buffer(mut bytes: &mut [u8], source: &[u8]) -> std::io::Result<usize> {
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bytes.write(source)
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}
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pub struct Statement {
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statement_type: StatementType,
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}
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impl Statement {
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pub fn new(statement_type: StatementType) -> Self {
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Self {
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statement_type,
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}
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}
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pub fn parse_statement(command: &String) -> Result<Self, String> {
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if command.starts_with("insert") {
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match sscanf::scanf!(command, "insert {} {} {}", usize, str, str) {
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Ok((id, username, email)) => {
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match Row::new(u32::try_from(id).unwrap(), username.to_string(), email.to_string()) {
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Ok(row) => {
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Ok(Statement::new(StatementType::Insert { row: row }))
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}
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Err(e) => { Err(e) }
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}
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}
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_ => {
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Err(String::from("could not parse insert statement"))
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}
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}
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} else if command.starts_with("select") {
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Ok(Statement::new(StatementType::Select))
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} else {
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return Err(String::from("Could not parse command"));
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}
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}
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pub(crate) fn execute(&self) {
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match &self.statement_type {
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StatementType::Insert { row } => {
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println!("This is where you do an insert {}", row.id)
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}
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StatementType::Select => {
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println!("This is where you do an select")
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}
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}
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}
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}
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