diff options
| -rw-r--r-- | Cargo.toml | 4 | ||||
| -rw-r--r-- | codegen/Cargo.toml | 9 | ||||
| -rw-r--r-- | codegen/README.md | 11 | ||||
| -rw-r--r-- | codegen/src/ext/mod.rs | 2 | ||||
| -rw-r--r-- | codegen/src/ext/utf8.rs | 365 | ||||
| -rw-r--r-- | codegen/src/ext/vt.rs | 393 | ||||
| -rw-r--r-- | codegen/src/main.rs | 23 | ||||
| -rw-r--r-- | generate_state_changes/Cargo.toml | 12 | ||||
| -rw-r--r-- | generate_state_changes/src/lib.rs | 174 | ||||
| -rw-r--r-- | src/definitions.rs | 63 | ||||
| -rw-r--r-- | src/lib.rs | 77 | ||||
| -rw-r--r-- | src/table.rs | 508 | ||||
| -rw-r--r-- | src/table.rs.in | 30 | ||||
| -rw-r--r-- | tests/demo.vte | 2052 | ||||
| -rw-r--r-- | utf8parse/Cargo.toml | 4 | ||||
| -rw-r--r-- | utf8parse/src/lib.rs | 50 | ||||
| -rw-r--r-- | utf8parse/src/table.rs | 166 | ||||
| -rw-r--r-- | utf8parse/src/table.rs.in | 60 | ||||
| -rw-r--r-- | utf8parse/src/types.rs | 121 |
19 files changed, 2660 insertions, 1464 deletions
@@ -13,12 +13,14 @@ name = "vte" edition = "2018" [dependencies] +generate_state_changes = { version = "0.1.0", path = "generate_state_changes" } arrayvec = { version = "0.5.1", default-features = false, optional = true } utf8parse = { path = "utf8parse", version = "0.1.0" } [features] default = ["no_std"] no_std = ["arrayvec"] +nightly = ["utf8parse/nightly"] [workspace] -members = ["utf8parse", "codegen"] +members = ["utf8parse", "generate_state_changes"] diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml deleted file mode 100644 index ec5a741..0000000 --- a/codegen/Cargo.toml +++ /dev/null @@ -1,9 +0,0 @@ -[package] -name = "codegen" -version = "0.1.0" -authors = ["Joe Wilm <joe@jwilm.com>"] -edition = "2018" - -[dependencies] -syntex = "0.43.0" -syntex_syntax = "0.43.0" diff --git a/codegen/README.md b/codegen/README.md deleted file mode 100644 index d13aa5d..0000000 --- a/codegen/README.md +++ /dev/null @@ -1,11 +0,0 @@ -codegen -======= - -Depends on libsyntex and generates table.rs from table.rs.in. This code is -separate from the main vtparse crate since compiling libsyntex takes ~1 -eternity. - -## Usage - -`cargo run` in the codegen folder will process `table.rs.in` and output -`table.rs`. The latter file should be committed back into the repo. diff --git a/codegen/src/ext/mod.rs b/codegen/src/ext/mod.rs deleted file mode 100644 index c28d9f7..0000000 --- a/codegen/src/ext/mod.rs +++ /dev/null @@ -1,2 +0,0 @@ -pub mod utf8; -pub mod vt; diff --git a/codegen/src/ext/utf8.rs b/codegen/src/ext/utf8.rs deleted file mode 100644 index 898722b..0000000 --- a/codegen/src/ext/utf8.rs +++ /dev/null @@ -1,365 +0,0 @@ -//! Macro expansion for the utf8 parser state table -use std::fmt; - -use syntex::Registry; - -use syntex_syntax::ast::{self, Arm, Expr, ExprKind, LitKind, Pat, PatKind}; -use syntex_syntax::codemap::Span; -use syntex_syntax::ext::base::{DummyResult, ExtCtxt, MacEager, MacResult}; -use syntex_syntax::ext::build::AstBuilder; -use syntex_syntax::parse::parser::Parser; -use syntex_syntax::parse::token::{DelimToken, Token}; -use syntex_syntax::parse::PResult; -use syntex_syntax::ptr::P; -use syntex_syntax::tokenstream::TokenTree; - -#[path = "../../../utf8parse/src/types.rs"] -mod types; - -use self::types::{pack, Action, State}; - -pub fn register(registry: &mut Registry) { - registry.add_macro("utf8_state_table", expand_state_table); -} - -fn state_from_str<S>(s: &S) -> Result<State, ()> -where - S: AsRef<str>, -{ - Ok(match s.as_ref() { - "State::Ground" => State::Ground, - "State::Tail3" => State::Tail3, - "State::Tail2" => State::Tail2, - "State::Tail1" => State::Tail1, - "State::U3_2_e0" => State::U3_2_e0, - "State::U3_2_ed" => State::U3_2_ed, - "State::Utf8_4_3_f0" => State::Utf8_4_3_f0, - "State::Utf8_4_3_f4" => State::Utf8_4_3_f4, - _ => return Err(()), - }) -} - -fn action_from_str<S>(s: &S) -> Result<Action, ()> -where - S: AsRef<str>, -{ - Ok(match s.as_ref() { - "Action::InvalidSequence" => Action::InvalidSequence, - "Action::EmitByte" => Action::EmitByte, - "Action::SetByte1" => Action::SetByte1, - "Action::SetByte2" => Action::SetByte2, - "Action::SetByte2Top" => Action::SetByte2Top, - "Action::SetByte3" => Action::SetByte3, - "Action::SetByte3Top" => Action::SetByte3Top, - "Action::SetByte4" => Action::SetByte4, - _ => return Err(()), - }) -} - -fn parse_table_input_mappings<'a>(parser: &mut Parser<'a>) -> PResult<'a, Vec<Arm>> { - // Must start on open brace - parser.expect(&Token::OpenDelim(DelimToken::Brace))?; - - let mut arms: Vec<Arm> = Vec::new(); - while parser.token != Token::CloseDelim(DelimToken::Brace) { - match parser.parse_arm() { - Ok(arm) => arms.push(arm), - Err(e) => { - // Recover by skipping to the end of the block. - return Err(e); - }, - } - } - - // Consume the closing brace - parser.bump(); - Ok(arms) -} - -/// Expressions describing state transitions and actions -#[derive(Debug)] -struct TableDefinitionExprs { - state_expr: P<Expr>, - mapping_arms: Vec<Arm>, -} - -fn state_from_expr(expr: P<Expr>, cx: &mut ExtCtxt) -> Result<State, ()> { - let s = match expr.node { - ExprKind::Path(ref _qself, ref path) => path.to_string(), - _ => { - cx.span_err(expr.span, "expected State"); - return Err(()); - }, - }; - - state_from_str(&s).map_err(|_| { - cx.span_err(expr.span, "expected State"); - }) -} - -fn u8_lit_from_expr(expr: &Expr, cx: &mut ExtCtxt) -> Result<u8, ()> { - static MSG: &str = "expected u8 int literal"; - - match expr.node { - ExprKind::Lit(ref lit) => match lit.node { - LitKind::Int(val, _) => Ok(val as u8), - _ => { - cx.span_err(lit.span, MSG); - Err(()) - }, - }, - _ => { - cx.span_err(expr.span, MSG); - Err(()) - }, - } -} - -fn input_mapping_from_arm(arm: Arm, cx: &mut ExtCtxt) -> Result<InputMapping, ()> { - let Arm { pats, body, .. } = arm; - - let input = InputDefinition::from_pat(&pats[0], cx)?; - let transition = Transition::from_expr(&body, cx)?; - - Ok(InputMapping { input, transition }) -} - -/// What happens when certain input is received -#[derive(Copy, Clone)] -enum Transition { - State(State), - Action(Action), - StateAction(State, Action), -} - -impl fmt::Debug for Transition { - fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { - match *self { - Transition::State(state) => write!(f, "State({:?})", state)?, - Transition::Action(action) => write!(f, "Action({:?})", action)?, - Transition::StateAction(state, action) => { - write!(f, "StateAction({:?}, {:?})", state, action)?; - }, - } - - write!(f, " -> {:?}", self.pack_u8()) - } -} - -impl Transition { - // State is stored in the top 4 bits - fn pack_u8(self) -> u8 { - match self { - Transition::State(state) => pack(state, Action::InvalidSequence), - Transition::Action(action) => pack(State::Ground, action), - Transition::StateAction(state, action) => pack(state, action), - } - } -} - -impl Transition { - fn from_expr(expr: &Expr, cx: &mut ExtCtxt) -> Result<Transition, ()> { - match expr.node { - ExprKind::Tup(ref tup_exprs) => { - let mut action = None; - let mut state = None; - - for tup_expr in tup_exprs { - if let ExprKind::Path(_, ref path) = tup_expr.node { - let path_str = path.to_string(); - if path_str.starts_with('A') { - action = Some(action_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid action"); - })?); - } else { - state = Some(state_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid state"); - })?); - } - } - } - - match (action, state) { - (Some(action), Some(state)) => Ok(Transition::StateAction(state, action)), - (None, Some(state)) => Ok(Transition::State(state)), - (Some(action), None) => Ok(Transition::Action(action)), - _ => { - cx.span_err(expr.span, "expected Action and/or State"); - Err(()) - }, - } - }, - ExprKind::Path(_, ref path) => { - // Path can be Action or State - let path_str = path.to_string(); - - if path_str.starts_with('A') { - let action = action_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid action"); - })?; - Ok(Transition::Action(action)) - } else { - let state = state_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid state"); - })?; - - Ok(Transition::State(state)) - } - }, - _ => { - cx.span_err(expr.span, "expected Action and/or State"); - Err(()) - }, - } - } -} - -#[derive(Debug)] -enum InputDefinition { - Specific(u8), - Range { start: u8, end: u8 }, -} - -impl InputDefinition { - fn from_pat(pat: &Pat, cx: &mut ExtCtxt) -> Result<InputDefinition, ()> { - Ok(match pat.node { - PatKind::Lit(ref lit_expr) => { - InputDefinition::Specific(u8_lit_from_expr(&lit_expr, cx)?) - }, - PatKind::Range(ref start_expr, ref end_expr) => InputDefinition::Range { - start: u8_lit_from_expr(start_expr, cx)?, - end: u8_lit_from_expr(end_expr, cx)?, - }, - _ => { - cx.span_err(pat.span, "expected literal or range expression"); - return Err(()); - }, - }) - } -} - -#[derive(Debug)] -struct InputMapping { - input: InputDefinition, - transition: Transition, -} - -#[derive(Debug)] -struct TableDefinition { - state: State, - mappings: Vec<InputMapping>, -} - -fn parse_raw_definitions( - definitions: Vec<TableDefinitionExprs>, - cx: &mut ExtCtxt, -) -> Result<Vec<TableDefinition>, ()> { - let mut out = Vec::new(); - - for raw in definitions { - let TableDefinitionExprs { state_expr, mapping_arms } = raw; - let state = state_from_expr(state_expr, cx)?; - - let mut mappings = Vec::new(); - for arm in mapping_arms { - mappings.push(input_mapping_from_arm(arm, cx)?); - } - - out.push(TableDefinition { state, mappings }) - } - - Ok(out) -} - -fn parse_table_definition<'a>(parser: &mut Parser<'a>) -> PResult<'a, TableDefinitionExprs> { - let state_expr = parser.parse_expr()?; - parser.expect(&Token::FatArrow)?; - let mappings = parse_table_input_mappings(parser)?; - - Ok(TableDefinitionExprs { state_expr, mapping_arms: mappings }) -} - -fn parse_table_definition_list<'a>( - parser: &mut Parser<'a>, -) -> PResult<'a, Vec<TableDefinitionExprs>> { - let mut definitions = Vec::new(); - while parser.token != Token::Eof { - definitions.push(parse_table_definition(parser)?); - parser.eat(&Token::Comma); - } - - Ok(definitions) -} - -fn build_state_tables<T>(defs: T) -> [[u8; 256]; 8] -where - T: AsRef<[TableDefinition]>, -{ - let mut result = [[0u8; 256]; 8]; - - for def in defs.as_ref() { - let state = def.state; - let state = state as u8; - let transitions = &mut result[state as usize]; - - for mapping in &def.mappings { - let trans = mapping.transition.pack_u8(); - match mapping.input { - InputDefinition::Specific(idx) => { - transitions[idx as usize] = trans; - }, - InputDefinition::Range { start, end } => { - for idx in start..end { - transitions[idx as usize] = trans; - } - transitions[end as usize] = trans; - }, - } - } - } - - result -} - -fn build_table_ast(cx: &mut ExtCtxt, sp: Span, table: [[u8; 256]; 8]) -> P<ast::Expr> { - let table = table - .iter() - .map(|list| { - let exprs = list.iter().map(|num| cx.expr_u8(sp, *num)).collect(); - cx.expr_vec(sp, exprs) - }) - .collect(); - - cx.expr_vec(sp, table) -} - -fn expand_state_table<'cx>( - cx: &'cx mut ExtCtxt, - sp: Span, - args: &[TokenTree], -) -> Box<dyn MacResult + 'cx> { - macro_rules! ptry { - ($pres:expr) => { - match $pres { - Ok(val) => val, - Err(mut err) => { - err.emit(); - return DummyResult::any(sp); - }, - } - }; - } - - // Parse the lookup spec - let mut parser: Parser = cx.new_parser_from_tts(args); - let definitions = ptry!(parse_table_definition_list(&mut parser)); - let definitions = match parse_raw_definitions(definitions, cx) { - Ok(definitions) => definitions, - Err(_) => return DummyResult::any(sp), - }; - - let table = build_state_tables(&definitions); - let ast = build_table_ast(cx, sp, table); - - MacEager::expr(ast) -} diff --git a/codegen/src/ext/vt.rs b/codegen/src/ext/vt.rs deleted file mode 100644 index aff7d68..0000000 --- a/codegen/src/ext/vt.rs +++ /dev/null @@ -1,393 +0,0 @@ -//! Macro expansion for the virtual terminal parser state table -use std::fmt; - -use syntex::Registry; - -use syntex_syntax::ast::{self, Arm, Expr, ExprKind, LitKind, Pat, PatKind}; -use syntex_syntax::codemap::Span; -use syntex_syntax::ext::base::{DummyResult, ExtCtxt, MacEager, MacResult}; -use syntex_syntax::ext::build::AstBuilder; -use syntex_syntax::parse::parser::Parser; -use syntex_syntax::parse::token::{DelimToken, Token}; -use syntex_syntax::parse::PResult; -use syntex_syntax::ptr::P; -use syntex_syntax::tokenstream::TokenTree; - -#[path = "../../../src/definitions.rs"] -mod definitions; - -use self::definitions::{Action, State}; - -pub fn register(registry: &mut Registry) { - registry.add_macro("vt_state_table", expand_state_table); -} - -fn state_from_str<S>(s: &S) -> Result<State, ()> -where - S: AsRef<str>, -{ - Ok(match s.as_ref() { - "State::Anywhere" => State::Anywhere, - "State::CsiEntry" => State::CsiEntry, - "State::CsiIgnore" => State::CsiIgnore, - "State::CsiIntermediate" => State::CsiIntermediate, - "State::CsiParam" => State::CsiParam, - "State::DcsEntry" => State::DcsEntry, - "State::DcsIgnore" => State::DcsIgnore, - "State::DcsIntermediate" => State::DcsIntermediate, - "State::DcsParam" => State::DcsParam, - "State::DcsPassthrough" => State::DcsPassthrough, - "State::Escape" => State::Escape, - "State::EscapeIntermediate" => State::EscapeIntermediate, - "State::Ground" => State::Ground, - "State::OscString" => State::OscString, - "State::SosPmApcString" => State::SosPmApcString, - "State::Utf8" => State::Utf8, - _ => return Err(()), - }) -} - -fn action_from_str<S>(s: &S) -> Result<Action, ()> -where - S: AsRef<str>, -{ - Ok(match s.as_ref() { - "Action::None" => Action::None, - "Action::Clear" => Action::Clear, - "Action::Collect" => Action::Collect, - "Action::CsiDispatch" => Action::CsiDispatch, - "Action::EscDispatch" => Action::EscDispatch, - "Action::Execute" => Action::Execute, - "Action::Hook" => Action::Hook, - "Action::Ignore" => Action::Ignore, - "Action::OscEnd" => Action::OscEnd, - "Action::OscPut" => Action::OscPut, - "Action::OscStart" => Action::OscStart, - "Action::Param" => Action::Param, - "Action::Print" => Action::Print, - "Action::Put" => Action::Put, - "Action::Unhook" => Action::Unhook, - "Action::BeginUtf8" => Action::BeginUtf8, - _ => return Err(()), - }) -} - -fn parse_table_input_mappings<'a>(parser: &mut Parser<'a>) -> PResult<'a, Vec<Arm>> { - // Must start on open brace - parser.expect(&Token::OpenDelim(DelimToken::Brace))?; - - let mut arms: Vec<Arm> = Vec::new(); - while parser.token != Token::CloseDelim(DelimToken::Brace) { - match parser.parse_arm() { - Ok(arm) => arms.push(arm), - Err(e) => { - // Recover by skipping to the end of the block. - return Err(e); - }, - } - } - - // Consume the closing brace - parser.bump(); - Ok(arms) -} - -/// Expressions describing state transitions and actions -#[derive(Debug)] -struct TableDefinitionExprs { - state_expr: P<Expr>, - mapping_arms: Vec<Arm>, -} - -fn state_from_expr(expr: P<Expr>, cx: &mut ExtCtxt) -> Result<State, ()> { - let s = match expr.node { - ExprKind::Path(ref _qself, ref path) => path.to_string(), - _ => { - cx.span_err(expr.span, "expected State"); - return Err(()); - }, - }; - - state_from_str(&s).map_err(|_| { - cx.span_err(expr.span, "expected State"); - }) -} - -fn u8_lit_from_expr(expr: &Expr, cx: &mut ExtCtxt) -> Result<u8, ()> { - static MSG: &str = "expected u8 int literal"; - - match expr.node { - ExprKind::Lit(ref lit) => match lit.node { - LitKind::Int(val, _) => Ok(val as u8), - _ => { - cx.span_err(lit.span, MSG); - Err(()) - }, - }, - _ => { - cx.span_err(expr.span, MSG); - Err(()) - }, - } -} - -fn input_mapping_from_arm(arm: Arm, cx: &mut ExtCtxt) -> Result<InputMapping, ()> { - let Arm { pats, body, .. } = arm; - - let input = InputDefinition::from_pat(&pats[0], cx)?; - let transition = Transition::from_expr(&body, cx)?; - - Ok(InputMapping { input, transition }) -} - -/// What happens when certain input is received -#[derive(Copy, Clone)] -enum Transition { - State(State), - Action(Action), - StateAction(State, Action), -} - -impl fmt::Debug for Transition { - fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { - match *self { - Transition::State(state) => write!(f, "State({:?})", state)?, - Transition::Action(action) => write!(f, "Action({:?})", action)?, - Transition::StateAction(state, action) => { - write!(f, "StateAction({:?}, {:?})", state, action)?; - }, - } - - write!(f, " -> {:?}", self.pack_u8()) - } -} - -impl Transition { - // State is stored in the top 4 bits - fn pack_u8(self) -> u8 { - match self { - Transition::State(state) => state as u8, - Transition::Action(action) => (action as u8) << 4, - Transition::StateAction(state, action) => ((action as u8) << 4) | (state as u8), - } - } -} - -impl Transition { - fn from_expr(expr: &Expr, cx: &mut ExtCtxt) -> Result<Transition, ()> { - match expr.node { - ExprKind::Tup(ref tup_exprs) => { - let mut action = None; - let mut state = None; - - for tup_expr in tup_exprs { - if let ExprKind::Path(_, ref path) = tup_expr.node { - let path_str = path.to_string(); - if path_str.starts_with('A') { - action = Some(action_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid action"); - })?); - } else { - state = Some(state_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid state"); - })?); - } - } - } - - match (action, state) { - (Some(action), Some(state)) => Ok(Transition::StateAction(state, action)), - (None, Some(state)) => Ok(Transition::State(state)), - (Some(action), None) => Ok(Transition::Action(action)), - _ => { - cx.span_err(expr.span, "expected Action and/or State"); - Err(()) - }, - } - }, - ExprKind::Path(_, ref path) => { - // Path can be Action or State - let path_str = path.to_string(); - - if path_str.starts_with('A') { - let action = action_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid action"); - })?; - Ok(Transition::Action(action)) - } else { - let state = state_from_str(&path_str).map_err(|_| { - cx.span_err(expr.span, "invalid state"); - })?; - - Ok(Transition::State(state)) - } - }, - _ => { - cx.span_err(expr.span, "expected Action and/or State"); - Err(()) - }, - } - } -} - -#[derive(Debug)] -enum InputDefinition { - Specific(u8), - Range { start: u8, end: u8 }, -} - -impl InputDefinition { - fn from_pat(pat: &Pat, cx: &mut ExtCtxt) -> Result<InputDefinition, ()> { - Ok(match pat.node { - PatKind::Lit(ref lit_expr) => { - InputDefinition::Specific(u8_lit_from_expr(&lit_expr, cx)?) - }, - PatKind::Range(ref start_expr, ref end_expr) => InputDefinition::Range { - start: u8_lit_from_expr(start_expr, cx)?, - end: u8_lit_from_expr(end_expr, cx)?, - }, - _ => { - cx.span_err(pat.span, "expected literal or range expression"); - return Err(()); - }, - }) - } -} - -#[derive(Debug)] -struct InputMapping { - input: InputDefinition, - transition: Transition, -} - -#[derive(Debug)] -struct TableDefinition { - state: State, - mappings: Vec<InputMapping>, -} - -fn parse_raw_definitions( - definitions: Vec<TableDefinitionExprs>, - cx: &mut ExtCtxt, -) -> Result<Vec<TableDefinition>, ()> { - let mut out = Vec::new(); - - for raw in definitions { - let TableDefinitionExprs { state_expr, mapping_arms } = raw; - let state = state_from_expr(state_expr, cx)?; - - let mut mappings = Vec::new(); - for arm in mapping_arms { - mappings.push(input_mapping_from_arm(arm, cx)?); - } - - out.push(TableDefinition { state, mappings }) - } - - Ok(out) -} - -fn parse_table_definition<'a>(parser: &mut Parser<'a>) -> PResult<'a, TableDefinitionExprs> { - let state_expr = parser.parse_expr()?; - parser.expect(&Token::FatArrow)?; - let mappings = parse_table_input_mappings(parser)?; - - Ok(TableDefinitionExprs { state_expr, mapping_arms: mappings }) -} - -fn parse_table_definition_list<'a>( - parser: &mut Parser<'a>, -) -> PResult<'a, Vec<TableDefinitionExprs>> { - let mut definitions = Vec::new(); - while parser.token != Token::Eof { - definitions.push(parse_table_definition(parser)?); - parser.eat(&Token::Comma); - } - - Ok(definitions) -} - -fn build_state_tables<T>(defs: T) -> [[u8; 256]; 16] -where - T: AsRef<[TableDefinition]>, -{ - let mut result = [[0u8; 256]; 16]; - - for def in defs.as_ref() { - let state = def.state; - let state = state as u8; - let transitions = &mut result[state as usize]; - - for mapping in &def.mappings { - let trans = mapping.transition.pack_u8(); - match mapping.input { - InputDefinition::Specific(idx) => { - transitions[idx as usize] = trans; - }, - InputDefinition::Range { start, end } => { - for idx in start..end { - transitions[idx as usize] = trans; - } - transitions[end as usize] = trans; - }, - } - } - } - - result -} - -fn build_table_ast(cx: &mut ExtCtxt, sp: Span, table: [[u8; 256]; 16]) -> P<ast::Expr> { - let table = table - .iter() - .map(|list| { - let exprs = list.iter().map(|num| cx.expr_u8(sp, *num)).collect(); - cx.expr_vec(sp, exprs) - }) - .collect(); - - cx.expr_vec(sp, table) -} - -fn expand_state_table<'cx>( - cx: &'cx mut ExtCtxt, - sp: Span, - args: &[TokenTree], -) -> Box<dyn MacResult + 'cx> { - macro_rules! ptry { - ($pres:expr) => { - match $pres { - Ok(val) => val, - Err(mut err) => { - err.emit(); - return DummyResult::any(sp); - }, - } - }; - } - - // Parse the lookup spec - let mut parser: Parser = cx.new_parser_from_tts(args); - let definitions = ptry!(parse_table_definition_list(&mut parser)); - let definitions = match parse_raw_definitions(definitions, cx) { - Ok(definitions) => definitions, - Err(_) => return DummyResult::any(sp), - }; - - let table = build_state_tables(&definitions); - let ast = build_table_ast(cx, sp, table); - - MacEager::expr(ast) -} - -#[cfg(test)] -mod tests { - use super::definitions::{Action, State}; - use super::Transition; - - #[test] - fn pack_u8() { - let transition = Transition::StateAction(State::CsiParam, Action::Collect); - assert_eq!(transition.pack_u8(), 0x24); - } -} diff --git a/codegen/src/main.rs b/codegen/src/main.rs deleted file mode 100644 index 7cc6cd0..0000000 --- a/codegen/src/main.rs +++ /dev/null @@ -1,23 +0,0 @@ -#![allow(dead_code)] - -use std::path::Path; - -use syntex; - -mod ext; - -fn main() { - // Expand VT parser state table - let mut registry = syntex::Registry::new(); - ext::vt::register(&mut registry); - let src = &Path::new("../src/table.rs.in"); - let dst = &Path::new("../src/table.rs"); - registry.expand("vt_state_table", src, dst).expect("expand vt_stable_table ok"); - - // Expand UTF8 parser state table - let mut registry = syntex::Registry::new(); - ext::utf8::register(&mut registry); - let src = &Path::new("../utf8parse/src/table.rs.in"); - let dst = &Path::new("../utf8parse/src/table.rs"); - registry.expand("utf8_state_table", src, dst).expect("expand utf8_stable_table ok"); -} diff --git a/generate_state_changes/Cargo.toml b/generate_state_changes/Cargo.toml new file mode 100644 index 0000000..efe5870 --- /dev/null +++ b/generate_state_changes/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "generate_state_changes" +version = "0.1.0" +authors = ["Christian Duerr <contact@christianduerr.com>"] +edition = "2018" + +[lib] +proc-macro = true + +[dependencies] +proc-macro2 = "1.0.6" +quote = "1.0.2" diff --git a/generate_state_changes/src/lib.rs b/generate_state_changes/src/lib.rs new file mode 100644 index 0000000..485a33e --- /dev/null +++ b/generate_state_changes/src/lib.rs @@ -0,0 +1,174 @@ +extern crate proc_macro; + +use std::iter::Peekable; + +use proc_macro2::TokenTree::{Group, Literal, Punct}; +use proc_macro2::{token_stream, TokenStream, TokenTree}; +use quote::quote; + +/// Create a `const fn` which will return an array with all state changes. +#[proc_macro] +pub fn generate_state_changes(item: proc_macro::TokenStream) -> proc_macro::TokenStream { + // Convert from proc_macro -> proc_macro2 + let item: TokenStream = item.into(); + let mut iter = item.into_iter().peekable(); + + // Determine output function name + let fn_name = iter.next().unwrap(); + + // Separator between name and body with state changes + expect_punct(&mut iter, ','); + + // Create token stream to assign each state change to the array + let assignments_stream = states_stream(&mut iter); + + quote!( + const fn #fn_name() -> [[u8; 256]; 16] { + let mut state_changes = [[0; 256]; 16]; + + #assignments_stream + + state_changes + } + ) + .into() +} + +/// Generate the array assignment statements for all origin states. +fn states_stream(iter: &mut impl Iterator<Item = TokenTree>) -> TokenStream { + let mut states_stream = next_group(iter).into_iter().peekable(); + + // Loop over all origin state entries + let mut tokens = quote!(); + while states_stream.peek().is_some() { + // Add all mappings for this state + tokens.extend(state_entry_stream(&mut states_stream)); + + // Allow trailing comma + optional_punct(&mut states_stream, ','); + } + tokens +} + +/// Generate the array assignment statements for one origin state. +fn state_entry_stream(iter: &mut Peekable<token_stream::IntoIter>) -> TokenStream { + // Origin state name + let state = iter.next().unwrap().into(); + + // Token stream with all the byte->target mappings + let mut changes_stream = next_group(iter).into_iter().peekable(); + + let mut tokens = quote!(); + while changes_stream.peek().is_some() { + // Add next mapping for this state + tokens.extend(change_stream(&mut changes_stream, &state)); + + // Allow trailing comma + optional_punct(&mut changes_stream, ','); + } + tokens +} + +/// Generate the array assignment statement for a single byte->target mapping for one state. +fn change_stream(iter: &mut Peekable<token_stream::IntoIter>, state: &TokenTree) -> TokenStream { + // Start of input byte range + let start = next_usize(iter); + + // End of input byte range + let end = if optional_punct(iter, '.') { + // Read inclusive end of range + expect_punct(iter, '.'); + expect_punct(iter, '='); + next_usize(iter) + } else { + // Without range, end is equal to start + start + }; + + // Separator between byte input range and output state + expect_punct(iter, '='); + expect_punct(iter, '>'); + + // Token stream with target state and action + let mut target_change_stream = next_group(iter).into_iter().peekable(); + + let mut tokens = quote!(); + while target_change_stream.peek().is_some() { + // Target state/action for all bytes in the range + let (target_state, target_action) = target_change(&mut target_change_stream); + + // Create a new entry for every byte in the range + for byte in start..=end { + // TODO: Force adding `State::` and `Action::`? + // TODO: Should we really use `pack` here without import? + tokens.extend(quote!( + state_changes[State::#state as usize][#byte] = + pack(State::#target_state, Action::#target_action); + )); + } + } + tokens +} + +/// Get next target state and action. +fn target_change(iter: &mut Peekable<token_stream::IntoIter>) -> (TokenTree, TokenTree) { + let target_state = iter.next().unwrap(); + + // Separator between state and action + expect_punct(iter, ','); + + let target_action = iter.next().unwrap(); + + (target_state, target_action) +} + +/// Check if next token matches specific punctuation. +fn optional_punct(iter: &mut Peekable<token_stream::IntoIter>, c: char) -> bool { + match iter.peek() { + Some(Punct(punct)) if punct.as_char() == c => iter.next().is_some(), + _ => false, + } +} + +/// Ensure next token matches specific punctuation. +/// +/// # Panics +/// +/// Panics if the punctuation does not match. +fn expect_punct(iter: &mut impl Iterator<Item = TokenTree>, c: char) { + match iter.next() { + Some(Punct(punct)) if punct.as_char() == c => (), + token => panic!("Expected punctuation '{}', but got {:?}", c, token), + } +} + +/// Get next token as [`usize`]. +/// +/// # Panics +/// +/// Panics if the next token is not a [`usize`] in hex or decimal literal format. +fn next_usize(iter: &mut impl Iterator<Item = TokenTree>) -> usize { + match iter.next() { + Some(Literal(literal)) => { + let literal = literal.to_string(); + if literal.starts_with("0x") { + usize::from_str_radix(&literal[2..], 16).unwrap() + } else { + usize::from_str_radix(&literal, 10).unwrap() + } + }, + token => panic!("Expected literal, but got {:?}", token), + } +} + +/// Get next token as [`Group`]. +/// +/// # Panics +/// +/// Panics if the next token is not a [`Group`]. +fn next_group(iter: &mut impl Iterator<Item = TokenTree>) -> TokenStream { + match iter.next() { + Some(Group(group)) => group.stream(), + token => panic!("Expected group, but got {:?}", token), + } +} diff --git a/src/definitions.rs b/src/definitions.rs index 375ac02..568eb41 100644 --- a/src/definitions.rs +++ b/src/definitions.rs @@ -1,3 +1,5 @@ +use core::mem; + #[allow(dead_code)] #[derive(Debug, Copy, Clone)] pub enum State { @@ -46,6 +48,27 @@ pub enum Action { BeginUtf8 = 15, } +impl State { + #[inline] + pub fn entry_action(&self) -> Action { + match self { + State::CsiEntry | State::DcsEntry | State::Escape => Action::Clear, + State::DcsPassthrough => Action::Hook, + State::OscString => Action::OscStart, + _ => Action::None, + } + } + + #[inline] + pub fn exit_action(&self) -> Action { + match self { + State::DcsPassthrough => Action::Unhook, + State::OscString => Action::OscEnd, + _ => Action::None, + } + } +} + /// Unpack a u8 into a State and Action /// /// The implementation of this assumes that there are *precisely* 16 variants for both Action and @@ -55,17 +78,25 @@ pub enum Action { /// Bad things will happen if those invariants are violated. #[inline(always)] pub fn unpack(delta: u8) -> (State, Action) { - ( - // State is stored in bottom 4 bits - unsafe { core::mem::transmute(delta & 0x0f) }, - // Action is stored in top 4 bits - unsafe { core::mem::transmute(delta >> 4) }, - ) + unsafe { + ( + // State is stored in bottom 4 bits + mem::transmute(delta & 0x0f), + // Action is stored in top 4 bits + mem::transmute(delta >> 4), + ) + } +} + +#[inline(always)] +pub const fn pack(state: State, action: Action) -> u8 { + (action as u8) << 4 | state as u8 } #[cfg(test)] mod tests { - use super::{unpack, Action, State}; + use super::*; + #[test] fn unpack_state_action() { match unpack(0xee) { @@ -83,4 +114,22 @@ mod tests { _ => panic!("unpack failed"), } } + + #[test] + fn pack_state_action() { + match unpack(0xee) { + (State::SosPmApcString, Action::Unhook) => (), + _ => panic!("unpack failed"), + } + + match unpack(0x0f) { + (State::Utf8, Action::None) => (), + _ => panic!("unpack failed"), + } + + match unpack(0xff) { + (State::Utf8, Action::BeginUtf8) => (), + _ => panic!("unpack failed"), + } + } } @@ -30,6 +30,7 @@ //! [`Parser`]: struct.Parser.html //! [`Perform`]: trait.Perform.html //! [Paul Williams' ANSI parser state machine]: https://vt100.net/emu/dec_ansi_parser +#![cfg_attr(all(feature = "nightly", test), feature(test))] #![cfg_attr(feature = "no_std", no_std)] use core::mem::MaybeUninit; @@ -42,21 +43,6 @@ mod definitions; mod table; use definitions::{unpack, Action, State}; -use table::{ENTRY_ACTIONS, EXIT_ACTIONS, STATE_CHANGE}; - -impl State { - /// Get exit action for this state - #[inline(always)] - pub fn exit_action(self) -> Action { - unsafe { *EXIT_ACTIONS.get_unchecked(self as usize) } - } - - /// Get entry action for this state - #[inline(always)] - pub fn entry_action(self) -> Action { - unsafe { *ENTRY_ACTIONS.get_unchecked(self as usize) } - } -} const MAX_INTERMEDIATES: usize = 2; #[cfg(any(feature = "no_std", test))] @@ -129,10 +115,10 @@ impl Parser { // Handle state changes in the anywhere state before evaluating changes // for current state. - let mut change = STATE_CHANGE[State::Anywhere as usize][byte as usize]; + let mut change = table::STATE_CHANGES[State::Anywhere as usize][byte as usize]; if change == 0 { - change = STATE_CHANGE[self.state as usize][byte as usize]; + change = table::STATE_CHANGES[self.state as usize][byte as usize]; } // Unpack into a state and action @@ -739,3 +725,60 @@ mod tests { assert_eq!(dispatcher.params[1].len(), MAX_OSC_RAW - dispatcher.params[0].len()); } } + +#[cfg(all(feature = "nightly", test))] +mod bench { + extern crate std; + extern crate test; + + use super::*; + + use test::{black_box, Bencher}; + + static VTE_DEMO: &[u8] = include_bytes!("../tests/demo.vte"); + + struct BenchDispatcher; + impl Perform for BenchDispatcher { + fn print(&mut self, c: char) { + black_box(c); + } + + fn execute(&mut self, byte: u8) { + black_box(byte); + } + + fn hook(&mut self, params: &[i64], intermediates: &[u8], ignore: bool, c: char) { + black_box((params, intermediates, ignore, c)); + } + + fn put(&mut self, byte: u8) { + black_box(byte); + } + + fn unhook(&mut self) {} + + fn osc_dispatch(&mut self, params: &[&[u8]]) { + black_box(params); + } + + fn csi_dispatch(&mut self, params: &[i64], intermediates: &[u8], ignore: bool, c: char) { + black_box((params, intermediates, ignore, c)); + } + + fn esc_dispatch(&mut self, params: &[i64], intermediates: &[u8], ignore: bool, byte: u8) { + black_box((params, intermediates, ignore, byte)); + } + } + + #[bench] + fn testfile(b: &mut Bencher) { + b.iter(|| { + let mut dispatcher = BenchDispatcher; + let mut parser = Parser::new(); + + for byte in VTE_DEMO { + parser.advance(&mut dispatcher, *byte); + } + }); + } +} diff --git a/src/table.rs b/src/table.rs index a9569aa..f5a90ee 100644 --- a/src/table.rs +++ b/src/table.rs @@ -1,343 +1,175 @@ /// This is the state change table. It's indexed first by current state and then by the next /// character in the pty stream. -use crate::definitions::Action; +use crate::definitions::{pack, Action, State}; -pub static STATE_CHANGE: [[u8; 256]; 16] = [ - // Beginning of UTF-8 2 byte sequence - // Beginning of UTF-8 3 byte sequence - // Beginning of UTF-8 4 byte sequence - [ - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 92u8, 0u8, 92u8, 10u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, - ], - [ - 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, - 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 80u8, 0u8, 80u8, 0u8, 0u8, 80u8, 80u8, - 80u8, 80u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, 35u8, - 35u8, 35u8, 35u8, 180u8, 180u8, 180u8, 180u8, 180u8, 180u8, 180u8, 180u8, 180u8, 180u8, - 2u8, 180u8, 36u8, 36u8, 36u8, 36u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, - 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, - 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, - 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, - 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 60u8, 112u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 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0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, - ], -]; +use generate_state_changes::generate_state_changes; -pub static ENTRY_ACTIONS: &[Action] = &[ - Action::None, // State::Anywhere - Action::Clear, // State::CsiEntry - Action::None, // State::CsiIgnore - Action::None, // State::CsiIntermediate - Action::None, // State::CsiParam - Action::Clear, // State::DcsEntry - Action::None, // State::DcsIgnore - Action::None, // State::DcsIntermediate - Action::None, // State::DcsParam - Action::Hook, // State::DcsPassthrough - Action::Clear, // State::Escape - Action::None, // State::EscapeIntermediate - Action::None, // State::Ground - Action::OscStart, // State::OscString - Action::None, // State::SosPmApcString - Action::None, -]; -// State::Utf8 +// Generate state changes at compile-time +pub static STATE_CHANGES: [[u8; 256]; 16] = state_changes(); +generate_state_changes!(state_changes, { + Anywhere { + 0x18 => (Ground, Execute), + 0x1a => (Ground, Execute), + 0x1b => (Escape, None), + }, -pub static EXIT_ACTIONS: &[Action] = &[ - Action::None, // State::Anywhere - Action::None, // State::CsiEntry - Action::None, // State::CsiIgnore - Action::None, // State::CsiIntermediate - Action::None, // State::CsiParam - Action::None, // State::DcsEntry - Action::None, // State::DcsIgnore - Action::None, // State::DcsIntermediate - Action::None, // State::DcsParam - Action::Unhook, // State::DcsPassthrough - Action::None, // State::Escape - Action::None, // State::EscapeIntermediate - Action::None, // State::Ground - Action::OscEnd, // State::OscString - Action::None, // State::SosPmApcString - Action::None, -]; // State::Utf8 + Ground { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x20..=0x7f => (Anywhere, Print), + 0x80..=0x8f => (Anywhere, Execute), + 0x91..=0x9a => (Anywhere, Execute), + 0x9c => (Anywhere, Execute), + // Beginning of UTF-8 2 byte sequence + 0xc2..=0xdf => (Utf8, BeginUtf8), + // Beginning of UTF-8 3 byte sequence + 0xe0..=0xef => (Utf8, BeginUtf8), + // Beginning of UTF-8 4 byte sequence + 0xf0..=0xf4 => (Utf8, BeginUtf8), + }, + + Escape { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x7f => (Anywhere, Ignore), + 0x20..=0x2f => (EscapeIntermediate, Collect), + 0x30..=0x4f => (Ground, EscDispatch), + 0x51..=0x57 => (Ground, EscDispatch), + 0x59 => (Ground, EscDispatch), + 0x5a => (Ground, EscDispatch), + 0x5c => (Ground, EscDispatch), + 0x60..=0x7e => (Ground, EscDispatch), + 0x5b => (CsiEntry, None), + 0x5d => (OscString, None), + 0x50 => (DcsEntry, None), + 0x58 => (SosPmApcString, None), + 0x5e => (SosPmApcString, None), + 0x5f => (SosPmApcString, None), + }, + + EscapeIntermediate { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x20..=0x2f => (Anywhere, Collect), + 0x7f => (Anywhere, Ignore), + 0x30..=0x7e => (Ground, EscDispatch), + }, + + CsiEntry { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x7f => (Anywhere, Ignore), + 0x20..=0x2f => (CsiIntermediate, Collect), + 0x3a => (CsiIgnore, None), + 0x30..=0x39 => (CsiParam, Param), + 0x3b => (CsiParam, Param), + 0x3c..=0x3f => (CsiParam, Collect), + 0x40..=0x7e => (Ground, CsiDispatch), + }, + + CsiIgnore { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x20..=0x3f => (Anywhere, Ignore), + 0x7f => (Anywhere, Ignore), + 0x40..=0x7e => (Ground, None), + }, + + CsiParam { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x30..=0x39 => (Anywhere, Param), + 0x3b => (Anywhere, Param), + 0x7f => (Anywhere, Ignore), + 0x3a => (CsiIgnore, None), + 0x3c..=0x3f => (CsiIgnore, None), + 0x20..=0x2f => (CsiIntermediate, Collect), + 0x40..=0x7e => (Ground, CsiDispatch), + }, + + CsiIntermediate { + 0x00..=0x17 => (Anywhere, Execute), + 0x19 => (Anywhere, Execute), + 0x1c..=0x1f => (Anywhere, Execute), + 0x20..=0x2f => (Anywhere, Collect), + 0x7f => (Anywhere, Ignore), + 0x30..=0x3f => (CsiIgnore, None), + 0x40..=0x7e => (Ground, CsiDispatch), + }, + + DcsEntry { + 0x00..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x7f => (Anywhere, Ignore), + 0x3a => (DcsIgnore, None), + 0x20..=0x2f => (DcsIntermediate, Collect), + 0x30..=0x39 => (DcsParam, Param), + 0x3b => (DcsParam, Param), + 0x3c..=0x3f => (DcsParam, Collect), + 0x40..=0x7e => (DcsPassthrough, None), + }, + + DcsIntermediate { + 0x00..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x20..=0x2f => (Anywhere, Collect), + 0x7f => (Anywhere, Ignore), + 0x30..=0x3f => (DcsIgnore, None), + 0x40..=0x7e => (DcsPassthrough, None), + }, + + DcsIgnore { + 0x00..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x20..=0x7f => (Anywhere, Ignore), + 0x9c => (Ground, None), + }, + + DcsParam { + 0x00..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x30..=0x39 => (Anywhere, Param), + 0x3b => (Anywhere, Param), + 0x7f => (Anywhere, Ignore), + 0x3a => (DcsIgnore, None), + 0x3c..=0x3f => (DcsIgnore, None), + 0x20..=0x2f => (DcsIntermediate, Collect), + 0x40..=0x7e => (DcsPassthrough, None), + }, + + DcsPassthrough { + 0x00..=0x17 => (Anywhere, Put), + 0x19 => (Anywhere, Put), + 0x1c..=0x1f => (Anywhere, Put), + 0x20..=0x7e => (Anywhere, Put), + 0x7f => (Anywhere, Ignore), + 0x9c => (Ground, None), + }, + + SosPmApcString { + 0x00..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x20..=0x7f => (Anywhere, Ignore), + 0x9c => (Ground, None), + }, + + OscString { + 0x00..=0x06 => (Anywhere, Ignore), + 0x07 => (Ground, None), + 0x08..=0x17 => (Anywhere, Ignore), + 0x19 => (Anywhere, Ignore), + 0x1c..=0x1f => (Anywhere, Ignore), + 0x20..=0xff => (Anywhere, OscPut), + } +}); diff --git a/src/table.rs.in b/src/table.rs.in index 5593283..0245af7 100644 --- a/src/table.rs.in +++ b/src/table.rs.in @@ -4,13 +4,13 @@ use definitions::Action; pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { - State::Anywhere => { + Anywhere { 0x18 => (Action::Execute, State::Ground), 0x1a => (Action::Execute, State::Ground), 0x1b => State::Escape, }, - State::Ground => { + Ground { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -26,7 +26,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0xf0...0xf4 => (State::Utf8, Action::BeginUtf8), }, - State::Escape => { + Escape { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -46,7 +46,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x5f => State::SosPmApcString, }, - State::EscapeIntermediate => { + EscapeIntermediate { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -55,7 +55,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x30...0x7e => (Action::EscDispatch, State::Ground) }, - State::CsiEntry => { + CsiEntry { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -68,7 +68,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => (Action::CsiDispatch, State::Ground) }, - State::CsiIgnore => { + CsiIgnore { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -77,7 +77,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => State::Ground, }, - State::CsiParam => { + CsiParam { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -90,7 +90,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => (Action::CsiDispatch, State::Ground) }, - State::CsiIntermediate => { + CsiIntermediate { 0x00...0x17 => Action::Execute, 0x19 => Action::Execute, 0x1c...0x1f => Action::Execute, @@ -100,7 +100,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => (Action::CsiDispatch, State::Ground), }, - State::DcsEntry => { + DcsEntry { 0x00...0x17 => Action::Ignore, 0x19 => Action::Ignore, 0x1c...0x1f => Action::Ignore, @@ -113,7 +113,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => State::DcsPassthrough }, - State::DcsIntermediate => { + DcsIntermediate { 0x00...0x17 => Action::Ignore, 0x19 => Action::Ignore, 0x1c...0x1f => Action::Ignore, @@ -123,7 +123,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => State::DcsPassthrough }, - State::DcsIgnore => { + DcsIgnore { 0x00...0x17 => Action::Ignore, 0x19 => Action::Ignore, 0x1c...0x1f => Action::Ignore, @@ -131,7 +131,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x9c => State::Ground }, - State::DcsParam => { + DcsParam { 0x00...0x17 => Action::Ignore, 0x19 => Action::Ignore, 0x1c...0x1f => Action::Ignore, @@ -144,7 +144,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x40...0x7e => State::DcsPassthrough }, - State::DcsPassthrough => { + DcsPassthrough { 0x00...0x17 => Action::Put, 0x19 => Action::Put, 0x1c...0x1f => Action::Put, @@ -153,7 +153,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x9c => State::Ground, }, - State::SosPmApcString => { + SosPmApcString { 0x00...0x17 => Action::Ignore, 0x19 => Action::Ignore, 0x1c...0x1f => Action::Ignore, @@ -161,7 +161,7 @@ pub static STATE_CHANGE: [[u8; 256]; 16] = vt_state_table! { 0x9c => State::Ground }, - State::OscString => { + OscString { 0x00...0x06 => Action::Ignore, 0x07 => State::Ground, 0x08...0x17 => Action::Ignore, diff --git a/tests/demo.vte b/tests/demo.vte new file mode 100644 index 0000000..ed62b35 --- /dev/null +++ b/tests/demo.vte @@ -0,0 +1,2052 @@ +Test +[31;42mRED ON GREEN +]52;c;Y2xpcGJvYXJkIHRlc3Q=];;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;some random text; what +[1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;p[4;m +[;4m +[123123123123123123123123123123123123mP0;1|17/ab +
]2;echo '¯\_(ツ)_/¯' && sleep 1 +[31mREEEEEED +Test +[31;42mRED ON GREEN +]52;c;Y2xpcGJvYXJkIHRlc3Q=];;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;some random text; what +[1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;p[4;m +[;4m +[123123123123123123123123123123123123mP0;1|17/ab +
]2;echo '¯\_(ツ)_/¯' && sleep 1 +[31mREEEEEEEEEEEEED +[6 q +[0 q +[0m +[0H[2J + +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12 +13 +14 +15 +16 +17 +18 +19 +20 +21 +22 +23 +24 +25 +26 +27 +28 +29 +30 +31 +32 +33 +34 +35 +36 +37 +38 +39 +40 +41 +42 +43 +44 +45 +46 +47 +48 +49 +50 +51 +52 +53 +54 +55 +56 +57 +58 +59 +60 +61 +62 +63 +64 +65 +66 +67 +68 +69 +70 +71 +72 +73 +74 +75 +76 +77 +78 +79 +80 +81 +82 +83 +84 +85 +86 +87 +88 +89 +90 +91 +92 +93 +94 +95 +96 +97 +98 +99 +100 +101 +102 +103 +104 +105 +106 +107 +108 +109 +110 +111 +112 +113 +114 +115 +116 +117 +118 +119 +120 +121 +122 +123 +124 +125 +126 +127 +128 +129 +130 +131 +132 +133 +134 +135 +136 +137 +138 +139 +140 +141 +142 +143 +144 +145 +146 +147 +148 +149 +150 +151 +152 +153 +154 +155 +156 +157 +158 +159 +160 +161 +162 +163 +164 +165 +166 +167 +168 +169 +170 +171 +172 +173 +174 +175 +176 +177 +178 +179 +180 +181 +182 +183 +184 +185 +186 +187 +188 +189 +190 +191 +192 +193 +194 +195 +196 +197 +198 +199 +200 +201 +202 +203 +204 +205 +206 +207 +208 +209 +210 +211 +212 +213 +214 +215 +216 +217 +218 +219 +220 +221 +222 +223 +224 +225 +226 +227 +228 +229 +230 +231 +232 +233 +234 +235 +236 +237 +238 +239 +240 +241 +242 +243 +244 +245 +246 +247 +248 +249 +250 +251 +252 +253 +254 +255 +256 +257 +258 +259 +260 +261 +262 +263 +264 +265 +266 +267 +268 +269 +270 +271 +272 +273 +274 +275 +276 +277 +278 +279 +280 +281 +282 +283 +284 +285 +286 +287 +288 +289 +290 +291 +292 +293 +294 +295 +296 +297 +298 +299 +300 +301 +302 +303 +304 +305 +306 +307 +308 +309 +310 +311 +312 +313 +314 +315 +316 +317 +318 +319 +320 +321 +322 +323 +324 +325 +326 +327 +328 +329 +330 +331 +332 +333 +334 +335 +336 +337 +338 +339 +340 +341 +342 +343 +344 +345 +346 +347 +348 +349 +350 +351 +352 +353 +354 +355 +356 +357 +358 +359 +360 +361 +362 +363 +364 +365 +366 +367 +368 +369 +370 +371 +372 +373 +374 +375 +376 +377 +378 +379 +380 +381 +382 +383 +384 +385 +386 +387 +388 +389 +390 +391 +392 +393 +394 +395 +396 +397 +398 +399 +400 +401 +402 +403 +404 +405 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\ No newline at end of file diff --git a/utf8parse/Cargo.toml b/utf8parse/Cargo.toml index d8b9174..8c8c8df 100644 --- a/utf8parse/Cargo.toml +++ b/utf8parse/Cargo.toml @@ -10,4 +10,6 @@ version = "0.1.1" name = "utf8parse" edition = "2018" -[dependencies] +[features] +nightly = [] +default = [] diff --git a/utf8parse/src/lib.rs b/utf8parse/src/lib.rs index 8c866f5..c092647 100644 --- a/utf8parse/src/lib.rs +++ b/utf8parse/src/lib.rs @@ -3,15 +3,14 @@ //! This module implements a table-driven UTF-8 parser which should //! theoretically contain the minimal number of branches (1). The only branch is //! on the `Action` returned from unpacking a transition. +#![cfg_attr(all(feature = "nightly", test), feature(test))] #![no_std] use core::char; -mod table; mod types; -use table::TRANSITIONS; -use types::{unpack, Action, State}; +use types::{Action, State}; /// Handles codepoint and invalid sequence events from the parser. pub trait Receiver { @@ -48,10 +47,7 @@ impl Parser { where R: Receiver, { - let cur = self.state as usize; - let change = TRANSITIONS[cur][byte as usize]; - let (state, action) = unsafe { unpack(change) }; - + let (state, action) = self.state.advance(byte); self.perform_action(receiver, byte, action); self.state = state; } @@ -93,3 +89,43 @@ impl Parser { } } } + +#[cfg(all(feature = "nightly", test))] +mod benches { + extern crate std; + extern crate test; + + use super::{Parser, Receiver}; + + use self::test::{black_box, Bencher}; + + static UTF8_DEMO: &[u8] = include_bytes!("../tests/UTF-8-demo.txt"); + + impl Receiver for () { + fn codepoint(&mut self, c: char) { + black_box(c); + } + + fn invalid_sequence(&mut self) {} + } + + #[bench] + fn parse_bench_utf8_demo(b: &mut Bencher) { + let mut parser = Parser::new(); + + b.iter(|| { + for byte in UTF8_DEMO { + parser.advance(&mut (), *byte); + } + }) + } + + #[bench] + fn std_string_parse_utf8(b: &mut Bencher) { + b.iter(|| { + for c in std::str::from_utf8(UTF8_DEMO).unwrap().chars() { + black_box(c); + } + }); + } +} diff --git a/utf8parse/src/table.rs b/utf8parse/src/table.rs deleted file mode 100644 index 04c4d34..0000000 --- a/utf8parse/src/table.rs +++ /dev/null @@ -1,166 +0,0 @@ -//! UTF-8 Parse Transition Table - -/// Transition table for parsing UTF-8. This is built from the grammar described -/// at https://tools.ietf.org/html/rfc3629#section-4 which I have copied and -/// formatted below. -/// -/// # UTF-8 Grammar -/// -/// ```notrust -/// UTF8-octets = *( UTF8-char ) -/// UTF8-char = UTF8-1 / UTF8-2 / UTF8-3 / UTF8-4 -/// UTF8-1 = %x00-7F -/// UTF8-2 = %xC2-DF UTF8-tail -/// UTF8-3 = %xE0 %xA0-BF UTF8-tail / -/// %xE1-EC 2( UTF8-tail ) / -/// %xED %x80-9F UTF8-tail / -/// %xEE-EF 2( UTF8-tail ) -/// UTF8-4 = %xF0 %x90-BF 2( UTF8-tail ) / -/// %xF1-F3 3( UTF8-tail ) / -/// %xF4 %x80-8F 2( UTF8-tail ) -/// UTF8-tail = %x80-BF -/// ``` -/// -/// Not specifying an action in this table is equivalent to specifying -/// Action::InvalidSequence. Not specifying a state is equivalent to specifying -/// state::ground. -pub static TRANSITIONS: [[u8; 256]; 8] = [ - [ - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, - 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 16u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, - 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UTF-8 Parse Transition Table - -/// Transition table for parsing UTF-8. This is built from the grammar described -/// at https://tools.ietf.org/html/rfc3629#section-4 which I have copied and -/// formatted below. -/// -/// # UTF-8 Grammar -/// -/// ```ignore -/// UTF8-octets = *( UTF8-char ) -/// UTF8-char = UTF8-1 / UTF8-2 / UTF8-3 / UTF8-4 -/// UTF8-1 = %x00-7F -/// UTF8-2 = %xC2-DF UTF8-tail -/// UTF8-3 = %xE0 %xA0-BF UTF8-tail / -/// %xE1-EC 2( UTF8-tail ) / -/// %xED %x80-9F UTF8-tail / -/// %xEE-EF 2( UTF8-tail ) -/// UTF8-4 = %xF0 %x90-BF 2( UTF8-tail ) / -/// %xF1-F3 3( UTF8-tail ) / -/// %xF4 %x80-8F 2( UTF8-tail ) -/// UTF8-tail = %x80-BF -/// ``` -/// -/// Not specifying an action in this table is equivalent to specifying -/// Action::InvalidSequence. Not specifying a state is equivalent to specifying -/// state::ground. -pub static TRANSITIONS: [[u8; 256]; 8] = utf8_state_table! { - State::Ground => { - 0x00...0x7f => (State::Ground, Action::EmitByte), - 0xc2...0xdf => (State::Tail1, Action::SetByte2Top), - 0xe0 => (State::U3_2_e0, Action::SetByte3Top), - 0xe1...0xec => (State::Tail2, Action::SetByte3Top), - 0xed => (State::U3_2_ed, Action::SetByte3Top), - 0xee...0xef => (State::Tail2, Action::SetByte3Top), - 0xf0 => (State::Utf8_4_3_f0, Action::SetByte4), - 0xf1...0xf3 => (State::Tail3, Action::SetByte4), - 0xf4 => (State::Utf8_4_3_f4, Action::SetByte4), - }, - State::U3_2_e0 => { - 0xa0...0xbf => (State::Tail1, Action::SetByte2), - }, - State::U3_2_ed => { - 0x80...0x9f => (State::Tail1, Action::SetByte2), - }, - State::Utf8_4_3_f0 => { - 0x90...0xbf => (State::Tail2, Action::SetByte3), - }, - State::Utf8_4_3_f4 => { - 0x80...0x8f => (State::Tail2, Action::SetByte3), - }, - State::Tail3 => { - 0x80...0xbf => (State::Tail2, Action::SetByte3), - }, - State::Tail2 => { - 0x80...0xbf => (State::Tail1, Action::SetByte2), - }, - State::Tail1 => { - 0x80...0xbf => (State::Ground, Action::SetByte1), - }, -}; diff --git a/utf8parse/src/types.rs b/utf8parse/src/types.rs index 93607fb..5a70b3c 100644 --- a/utf8parse/src/types.rs +++ b/utf8parse/src/types.rs @@ -1,12 +1,31 @@ //! Types supporting the UTF-8 parser -#![allow(non_camel_case_types)] -use core::mem; + +/// Action to take when receiving a byte +#[derive(Debug, Copy, Clone)] +pub enum Action { + /// Unexpected byte; sequence is invalid + InvalidSequence = 0, + /// Received valid 7-bit ASCII byte which can be directly emitted. + EmitByte = 1, + /// Set the bottom continuation byte + SetByte1 = 2, + /// Set the 2nd-from-last continuation byte + SetByte2 = 3, + /// Set the 2nd-from-last byte which is part of a two byte sequence + SetByte2Top = 4, + /// Set the 3rd-from-last continuation byte + SetByte3 = 5, + /// Set the 3rd-from-last byte which is part of a three byte sequence + SetByte3Top = 6, + /// Set the top byte of a four byte sequence. + SetByte4 = 7, +} /// States the parser can be in. /// /// There is a state for each initial input of the 3 and 4 byte sequences since /// the following bytes are subject to different conditions than a tail byte. -#[allow(dead_code)] +#[allow(non_camel_case_types)] #[derive(Debug, Copy, Clone)] pub enum State { /// Ground state; expect anything @@ -33,50 +52,54 @@ impl Default for State { } } -/// Action to take when receiving a byte -#[allow(dead_code)] -#[derive(Debug, Copy, Clone)] -pub enum Action { - /// Unexpected byte; sequence is invalid - InvalidSequence = 0, - /// Received valid 7-bit ASCII byte which can be directly emitted. - EmitByte = 1, - /// Set the bottom continuation byte - SetByte1 = 2, - /// Set the 2nd-from-last continuation byte - SetByte2 = 3, - /// Set the 2nd-from-last byte which is part of a two byte sequence - SetByte2Top = 4, - /// Set the 3rd-from-last continuation byte - SetByte3 = 5, - /// Set the 3rd-from-last byte which is part of a three byte sequence - SetByte3Top = 6, - /// Set the top byte of a four byte sequence. - SetByte4 = 7, -} - -/// Convert a state and action to a u8 -/// -/// State will be the bottom 4 bits and action the top 4 -#[inline] -#[allow(dead_code)] -pub fn pack(state: State, action: Action) -> u8 { - ((action as u8) << 4) | (state as u8) -} - -/// Convert a u8 to a state and action -/// -/// # Unsafety -/// -/// If this function is called with a byte that wasn't encoded with the `pack` -/// function in this module, there is no guarantee that a valid state and action -/// can be produced. -#[inline] -pub unsafe fn unpack(val: u8) -> (State, Action) { - ( - // State is stored in bottom 4 bits - mem::transmute(val & 0x0f), - // Action is stored in top 4 bits - mem::transmute(val >> 4), - ) +impl State { + /// Advance the parser state. + /// + /// This takes the current state and input byte into consideration, to determine the next state + /// and any action that should be taken. + #[inline] + pub fn advance(&self, byte: u8) -> (State, Action) { + match self { + State::Ground => match byte { + 0x00..=0x7f => (State::Ground, Action::EmitByte), + 0xc2..=0xdf => (State::Tail1, Action::SetByte2Top), + 0xe0 => (State::U3_2_e0, Action::SetByte3Top), + 0xe1..=0xec => (State::Tail2, Action::SetByte3Top), + 0xed => (State::U3_2_ed, Action::SetByte3Top), + 0xee..=0xef => (State::Tail2, Action::SetByte3Top), + 0xf0 => (State::Utf8_4_3_f0, Action::SetByte4), + 0xf1..=0xf3 => (State::Tail3, Action::SetByte4), + 0xf4 => (State::Utf8_4_3_f4, Action::SetByte4), + _ => (State::Ground, Action::InvalidSequence), + }, + State::U3_2_e0 => match byte { + 0xa0..=0xbf => (State::Tail1, Action::SetByte2), + _ => (State::Ground, Action::InvalidSequence), + }, + State::U3_2_ed => match byte { + 0x80..=0x9f => (State::Tail1, Action::SetByte2), + _ => (State::Ground, Action::InvalidSequence), + }, + State::Utf8_4_3_f0 => match byte { + 0x90..=0xbf => (State::Tail2, Action::SetByte3), + _ => (State::Ground, Action::InvalidSequence), + }, + State::Utf8_4_3_f4 => match byte { + 0x80..=0x8f => (State::Tail2, Action::SetByte3), + _ => (State::Ground, Action::InvalidSequence), + }, + State::Tail3 => match byte { + 0x80..=0xbf => (State::Tail2, Action::SetByte3), + _ => (State::Ground, Action::InvalidSequence), + }, + State::Tail2 => match byte { + 0x80..=0xbf => (State::Tail1, Action::SetByte2), + _ => (State::Ground, Action::InvalidSequence), + }, + State::Tail1 => match byte { + 0x80..=0xbf => (State::Ground, Action::SetByte1), + _ => (State::Ground, Action::InvalidSequence), + }, + } + } } |