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//! SMT Lib 2 result parsers. //! //! Depending on the commands you plan to use, your parser will need to implement //! //! | | for | //! |:----------------:|:------------------------------------------------:| //! | [`IdentParser`] | [`Solver::get_model`](super::Solver::get_model) | //! | [`ModelParser`] | [`Solver::get_model`](super::Solver::get_model) | //! | [`ValueParser`] | [`Solver::get_model`](super::Solver::get_model) | //! | [`ExprParser`] | [`Solver::get_values`](super::Solver::get_values) | //! | [`ProofParser`] | *currently unused* | //! //! You can choose the kind of input you want to parse, between //! //! - `& [u8]`, *e.g.* for [`nom`][nom], //! - `& str`, *e.g.* for [`regex`][regex], //! - [`& mut SmtParser`](SmtParser), `rmst2`'s own parser which provides simple helpers to parse //! s-expressions. //! //! The first two are safe in that your parsers will be called on the tokens they are supposed to //! parse and nothing else. //! //! //! ## Parsing: `&str` (and `&[u8]`) //! //! //! Here is a first example where we defined a value parser that only recognizes booleans, to //! showcase [`ValueParser`] and [`Solver::get_values`](super::Solver::get_values). `Expr`essions //! are represented as strings, and `Val`ues are booleans. //! //! ```rust //! # extern crate rsmt2; //! use rsmt2::{SmtConf, SmtRes, Solver, parse::ValueParser, parse::ExprParser}; //! //! pub type Expr = String; //! pub type Val = bool; //! //! #[derive(Clone, Copy)] //! pub struct Parser; //! // Value parser implementation for `&'a str` input. //! impl<'a> ValueParser<Val, &'a str> for Parser { //! fn parse_value(self, input: &'a str) -> SmtRes<Val> { //! // When parsing `&str` or `&[u8]`, the input is the actual value. //! match input { //! "true" => Ok(true), //! "false" => Ok(false), //! s => Err(format!("unsupported value `{}`", s).into()), //! } //! } //! } //! impl<'a> ExprParser<Expr, (), &'a str> for Parser { //! fn parse_expr(self, input: &'a str, _: ()) -> SmtRes<Expr> { //! // When parsing `&str` or `&[u8]`, the input is the actual expression. Here we're not //! // constructing some complex expression, we just want to turn the `&str` into a //! // `String`. //! Ok(input.into()) //! } //! } //! //! let mut solver = SmtConf::default_z3().spawn(Parser).unwrap(); //! solver.declare_const("a", "Bool").unwrap(); //! solver.declare_const("b", "Bool").unwrap(); //! solver.assert("(and a (not b))").unwrap(); //! let is_sat = solver.check_sat().unwrap(); //! assert!(is_sat); //! let values = solver.get_values(&["a", "b", "(and a (not b))"]).unwrap(); //! assert_eq!( //! &format!("{:?}", values), //! r#"[("a", true), ("b", false), ("(and a (not b))", true)]"# //! ); //! let mut values = values.into_iter(); //! assert_eq!( values.next(), Some(("a".to_string(), true)) ); //! assert_eq!( values.next(), Some(("b".to_string(), false)) ); //! assert_eq!( values.next(), Some(("(and a (not b))".to_string(), true)) ); //! ``` //! //! Here is a second example where we implement [`ModelParser`] and [`IdentParser`]. We must provide //! parsing functions for identifiers, types and values. //! //! ```rust //! # extern crate rsmt2; //! # use rsmt2::parse::SmtParser; //! # fn main() { //! use rsmt2::parse::{ IdentParser, ModelParser }; //! use rsmt2::SmtRes; //! let txt = "\ //! ( model (define-fun a () Int (- 17)) ) //! "; //! let mut parser = SmtParser::of_str(txt); //! //! struct Parser; //! impl<'a, 'b> ModelParser< //! String, String, String, & 'a str //! > for & 'b Parser { //! fn parse_value( //! self, input: & 'a str, //! _: & String, _: & [ (String, String) ], _: & String, //! ) -> SmtRes<String> { //! Ok(input.into()) //! } //! } //! impl<'a, 'b> IdentParser<String, String, & 'a str> for & 'b Parser { //! fn parse_ident(self, input: & 'a str) -> SmtRes<String> { //! Ok(input.into()) //! } //! fn parse_type(self, input: & 'a str) -> SmtRes<String> { //! Ok(input.into()) //! } //! } //! //! let model = parser.get_model_const( false, & Parser ).expect("model"); //! assert_eq!( model, vec![ ("a".into(), "Int".into(), "(- 17)".into()) ] ) //! # } //! ``` //! //! //! ## Parsing: [`SmtParser`] //! //! But a parser taking [`SmtParser`] as input is "unsafe" in the sense that it has access to the //! whole input. Note that [`SmtParser`] provides helper parsing functions such as //! [`SmtParser::try_int`] and [`SmtParser::try_sym`]. //! //! ``` //! # extern crate rsmt2; //! # use rsmt2::parse::SmtParser; //! # fn main() { //! use rsmt2::parse::{ IdentParser, ModelParser }; //! use rsmt2::errors::SmtRes; //! let txt = "\ //! ( model (define-fun a () Int (- 17)) ) //! "; //! let mut parser = SmtParser::of_str(txt); //! //! struct Parser; //! impl<'a, 'b, Br: ::std::io::BufRead> ModelParser< //! String, String, String, & 'a mut SmtParser<Br> //! > for & 'b Parser { //! fn parse_value( //! self, input: & 'a mut SmtParser<Br>, //! _: & String, _: & [ (String, String) ], _: & String, //! ) -> SmtRes<String> { //! input.tag("(- 17))") ?; Ok( "-17".into() ) //! // ^~~~~ eating more input than we should... //! } //! } //! impl<'a, 'b, Br: ::std::io::BufRead> IdentParser< //! String, String, & 'a mut SmtParser<Br> //! > for & 'b Parser { //! fn parse_ident(self, input: & 'a mut SmtParser<Br>) -> SmtRes<String> { //! input.tag("a") ?; Ok( "a".into() ) //! } //! fn parse_type(self, input: & 'a mut SmtParser<Br>) -> SmtRes<String> { //! input.tag("Int") ?; Ok( "Int".into() ) //! } //! } //! //! use rsmt2::errors::ErrorKind; //! match * parser.get_model_const( false, & Parser ).unwrap_err().kind() { //! ErrorKind::ParseError(ref msg, ref token) => { //! assert_eq!( //! msg, "expected `(` opening define-fun or `)` closing model" //! ); //! assert_eq!(token, "eof") //! }, //! ref error => panic!("unexpected error: {}", error) //! } //! # } //! ``` //! //! [nom]: https://crates.io/crates/nom (nom crate on crates.io) //! [regex]: https://crates.io/crates/regex (regex crate on crates.io) use crate::common::*; use std::io::{BufRead, BufReader, Read}; use std::process::ChildStdout; /// Alias for the underlying parser. pub type RSmtParser = SmtParser<BufReader<ChildStdout>>; /// Tries a user parser. macro_rules! try_apply { ($e:expr => |$res:pat| $do:expr, $msg:expr) => { match $e { Ok($res) => $do, Err(e) => bail!("{}: {}", $msg, e), } }; } /// SMT-LIB 2.0 parser. pub struct SmtParser<R> { /// Reader being parsed. input: R, /// Buffer we are reading to. buff: String, /// Second buffer for swapping. buff_2: String, /// Current position in the text. cursor: usize, } impl<R: Read> Read for SmtParser<R> { fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> { self.input.read(buf) } } impl<'a> SmtParser<BufReader<&'a [u8]>> { /// Constructor from a string, mostly for doc/test purposes. pub fn of_str(s: &'a str) -> Self { SmtParser::new(BufReader::new(s.as_bytes())) } } impl<R: BufRead> SmtParser<R> { /// Creates an SMT parser. pub fn new(input: R) -> Self { SmtParser { input, buff: String::with_capacity(5_000), buff_2: String::with_capacity(5_000), cursor: 0, } } /// Swaps the input source. pub fn swap(&mut self, nu_input: &mut R) { ::std::mem::swap(&mut self.input, nu_input) } /// Immutable access to the buffer. pub fn buff(&self) -> &str { &self.buff } /// Immutable access to the part of the buffer that's not been parsed yet. pub fn buff_rest(&self) -> &str { &self.buff[self.cursor..] } /// The current position in the buffer. pub fn cursor(&self) -> usize { self.cursor } /// Reads a line from the input. Returns `true` if something was read. fn read_line(&mut self) -> SmtRes<bool> { let read = self.input.read_line(&mut self.buff)?; Ok(read != 0) } /// Returns the next s-expression and positions the cursor directly after it. /// /// An s-expression is an ident, a constant with no parens (`42`, `false`, *etc.*), or something /// between (nested) parens. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = "\ /// token ; a comment\n\n next_token; more comments\n\ /// (+ |quoted ident,; a comment\n parens don't count)| 7)42 false\ /// "; /// let mut parser = SmtParser::of_str(txt); /// /// assert_eq!( parser.get_sexpr().unwrap(), "token" ); /// assert_eq!( parser.buff_rest(), " ; a comment\n" ); /// /// assert_eq!( parser.get_sexpr().unwrap(), "next_token" ); /// assert_eq!( parser.buff_rest(), "; more comments\n" ); /// /// assert_eq!( /// parser.get_sexpr().unwrap(), /// "(+ |quoted ident,; a comment\n parens don't count)| 7)" /// ); /// assert_eq!( parser.buff_rest(), "42 false" ); /// /// assert_eq!( parser.get_sexpr().unwrap(), "42" ); /// assert_eq!( parser.buff_rest(), " false" ); /// /// assert_eq!( parser.get_sexpr().unwrap(), "false" ); /// assert_eq!( parser.buff_rest(), "" ); /// # } /// ``` pub fn get_sexpr(&mut self) -> SmtRes<&str> { let sexpr_end = self.load_sexpr()?; let sexpr_start = self.cursor; self.cursor = sexpr_end; Ok(&self.buff[sexpr_start..sexpr_end]) } /// Loads lines until a full s-expr is loaded. /// /// Returns the next position of the end of the sexpr. The cursor will be set at its beginning. fn load_sexpr(&mut self) -> SmtRes<usize> { self.spc_cmt(); let (mut op_paren, mut cl_paren) = (0, 0); let mut quoted_ident = false; let mut sexpr_start = self.cursor; let mut sexpr_end = sexpr_start; 'load: loop { if sexpr_start == self.buff.len() { let eof = !self.read_line()?; if eof { bail!("reached eof") } } debug_assert!(op_paren >= cl_paren); for line in self.buff[sexpr_start..].lines() { debug_assert!(op_paren >= cl_paren); let mut this_end = sexpr_start; let mut chars = line.chars(); 'this_line: while let Some(c) = chars.next() { debug_assert!(op_paren >= cl_paren); this_end += 1; if quoted_ident { quoted_ident = c != '|'; if !quoted_ident && op_paren == 0 { sexpr_end = this_end; break 'load; } } else { match c { ';' => break 'this_line, '|' => quoted_ident = !quoted_ident, '(' => op_paren += 1, ')' => { cl_paren += 1; if op_paren == cl_paren { sexpr_end = this_end; break 'load; } } _ => { if !c.is_whitespace() && op_paren == 0 { // print!("... `"); 'token: for c in chars { if c.is_whitespace() { break 'token; } match c { ')' | '(' | '|' | ';' => break 'token, _ => this_end += 1, } } sexpr_end = this_end; break 'load; } } } } } } if sexpr_start == self.buff.len() { break 'load; } sexpr_start = self.buff.len() } self.spc_cmt(); Ok(sexpr_end) } /// Clears the buffer up to the current position. pub fn clear(&mut self) { self.spc_cmt(); if !self.cursor >= self.buff.len() { debug_assert!(self.buff_2.is_empty()); self.buff_2.push_str(&self.buff[self.cursor..]); self.buff.clear(); ::std::mem::swap(&mut self.buff, &mut self.buff_2); self.cursor = 0 } else { self.buff.clear(); self.cursor = 0 } } /// Prints itself, for debugging. pub fn print(&self, pref: &str) { let mut count = 0; let mut printed_cursor = false; for line in self.buff.lines() { println!("{}|`{}`", pref, line); if !printed_cursor { let nu_count = count + line.len() + 1; if self.cursor <= nu_count { printed_cursor = true; println!("{0}| {1: >2$}^", pref, "", self.cursor - count) } count = nu_count; } } } /// Parses some spaces or some comments. /// /// Parsing a tag or loading an s-expression fetches new lines, this does not. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = " token ; a comment\n\n next token; last comment"; /// let mut parser = SmtParser::of_str(txt); /// /// parser.spc_cmt(); /// assert_eq!( parser.buff_rest(), "" ); /// assert_eq!( parser.buff(), "" ); /// /// assert!( parser.try_tag("token").expect("token") ); /// assert_eq!( parser.buff_rest(), " ; a comment\n" ); /// assert_eq!( parser.buff(), " token ; a comment\n" ); /// /// parser.spc_cmt(); /// assert_eq!( parser.buff_rest(), "" ); /// assert_eq!( parser.buff(), " token ; a comment\n" ); /// /// assert!( parser.try_tag("next token").expect("token") ); /// assert_eq!( parser.buff_rest(), "; last comment" ); /// assert_eq!( parser.buff(), txt ); /// /// parser.spc_cmt(); /// assert_eq!( parser.buff_rest(), "" ); /// assert_eq!( parser.buff(), txt ); /// # } /// ``` pub fn spc_cmt(&mut self) { let mut chars = self.buff[self.cursor..].chars(); 'spc_cmt: while let Some(c) = chars.next() { if !c.is_whitespace() { if c == ';' { self.cursor += 1; 'skip_line: while let Some(c) = chars.next() { self.cursor += 1; if c == '\n' || c == '\r' { break 'skip_line; } } } else { break 'spc_cmt; } } else { self.cursor += 1; } } } /// Tries to parse a tag, `true` if successful. Parse whitespaces and comments if any before the /// token. /// /// If this function returns `false`, then the cursor is at the first non-whitespace /// non-commented character after the original cursor position. /// /// See also [`Self::tag`], [`Self::tag_info`] and [`Self::tags`]. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = "\ /// a tag is anything |(>_<)| ; a comment\n\n next token; last comment\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert!( parser.try_tag("a tag is anything").expect("tag") ); /// assert_eq!( parser.buff_rest(), " |(>_<)| ; a comment\n" ); /// assert!( ! parser.try_tag("not the token").expect("tag") ); /// assert_eq!( parser.buff_rest(), "|(>_<)| ; a comment\n" ); /// assert!( parser.try_tag("|(>_<)|").expect("tag") ); /// assert!( ! parser.try_tag("not the next token").expect("tag") ); /// assert_eq!( parser.buff_rest(), "next token; last comment" ); /// assert!( parser.try_tag("next token").expect("tag") ); /// # } /// ``` pub fn try_tag(&mut self, tag: &str) -> SmtRes<bool> { loop { self.spc_cmt(); if self.cursor + tag.len() >= self.buff.len() + 1 { if self.cursor < self.buff.len() { if self.buff[self.cursor..self.buff.len()] != tag[0..self.buff.len() - self.cursor] { return Ok(false); } else { () } } let eof = !self.read_line()?; self.spc_cmt(); if eof { return Ok(false); } } else if &self.buff[self.cursor..self.cursor + tag.len()] == tag { self.cursor += tag.len(); return Ok(true); } else { self.spc_cmt(); return Ok(false); } } } /// Parses a tag or fails. /// /// Returns `()` exactly when [`Self::try_tag`] returns `true`, and an error otherwise. pub fn tag(&mut self, tag: &str) -> SmtRes<()> { if self.try_tag(tag)? { Ok(()) } else { self.fail_with(format!("expected `{}`", tag)) } } /// Parses a tag or fails, appends `err_msg` at the end of the error message. /// /// Returns `()` exactly when [`Self::try_tag`] returns `true`, and an error otherwise. pub fn tag_info(&mut self, tag: &str, err_msg: &str) -> SmtRes<()> { if self.try_tag(tag)? { Ok(()) } else { self.fail_with(format!("expected `{}` {}", tag, err_msg)) } } /// The current position. fn pos(&self) -> usize { self.cursor } /// Backtracks to the position specified. fn backtrack_to(&mut self, pos: usize) { self.cursor = pos } /// Parses a tag followed by a whitespace, a paren or a comment. /// /// If this function returns `false`, then the cursor is at the first non-whitespace /// non-commented character after the original cursor position. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = "\ /// a word is anything |(>_<)| last; comment\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert!( parser.try_word("a word is").expect("word") ); /// assert_eq!( parser.buff_rest(), " anything |(>_<)| last; comment" ); /// assert!( ! parser.try_word("a").expect("word") ); /// assert_eq!( parser.buff_rest(), "anything |(>_<)| last; comment" ); /// assert!( ! parser.try_word("any").expect("word") ); /// assert_eq!( parser.buff_rest(), "anything |(>_<)| last; comment" ); /// assert!( ! parser.try_word("anythin").expect("word") ); /// assert_eq!( parser.buff_rest(), "anything |(>_<)| last; comment" ); /// assert!( parser.try_word("anything").expect("word") ); /// assert_eq!( parser.buff_rest(), " |(>_<)| last; comment" ); /// assert!( parser.try_word("|").expect("word") ); /// assert_eq!( parser.buff_rest(), "(>_<)| last; comment" ); /// assert!( parser.try_tag("(").expect("tag") ); /// assert_eq!( parser.buff_rest(), ">_<)| last; comment" ); /// assert!( parser.try_word(">_<").expect("word") ); /// assert_eq!( parser.buff_rest(), ")| last; comment" ); /// assert!( parser.try_tag(")").expect("tag") ); /// assert_eq!( parser.buff_rest(), "| last; comment" ); /// assert!( parser.try_word("|").expect("word") ); /// assert_eq!( parser.buff_rest(), " last; comment" ); /// assert!( parser.try_word("last").expect("word") ); /// assert_eq!( parser.buff_rest(), "; comment" ); /// # } /// ``` pub fn try_word(&mut self, word: &str) -> SmtRes<bool> { let start_pos = self.pos(); if self.try_tag(word)? { if let Some(c) = self.buff[self.cursor..].chars().next() { if c.is_whitespace() || c == ')' || c == '(' || c == ';' { return Ok(true); } } } self.backtrack_to(start_pos); self.spc_cmt(); Ok(false) } /// Tries to parse a sequence of things potentially separated by whitespaces and/or comments. /// /// If this function returns `false`, then the cursor is at the first non-whitespace /// non-commented character after the original cursor position. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = "\ /// a tag is anything |(>_<)| ; a comment\n\n next token; last comment\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert!( /// parser.try_tags( /// &[ "a", "tag", "is anything", "|", "(", ">_<", ")", "|" ] /// ).expect("tags") /// ); /// assert_eq!( parser.buff_rest(), " ; a comment\n" ); /// assert!( /// ! parser.try_tags( /// & [ "next", "token", "something else?" ] /// ).expect("tags") /// ); /// assert_eq!( parser.buff_rest(), "next token; last comment" ) /// # } /// ``` pub fn try_tags<'a, Tags, S>(&mut self, tags: &'a Tags) -> SmtRes<bool> where &'a Tags: IntoIterator<Item = S>, S: AsRef<str>, { let start_pos = self.pos(); for tag in tags { if !self.try_tag(tag.as_ref())? { self.backtrack_to(start_pos); self.spc_cmt(); return Ok(false); } } Ok(true) } /// Parses a sequence of things potentially separated by whitespaces and/or comments. /// /// Returns `()` exactly when [`Self::try_tags`] returns `true`, and an error otherwise. pub fn tags<'a, Tags, S>(&mut self, tags: &'a Tags) -> SmtRes<()> where &'a Tags: IntoIterator<Item = S>, S: AsRef<str>, { for tag in tags { self.tag(tag.as_ref())? } Ok(()) } /// Generates a failure at the current position. pub fn fail_with<T, Str: Into<String>>(&mut self, msg: Str) -> SmtRes<T> { self.try_error()?; let sexpr = match self.get_sexpr() { Ok(e) => Some(e.to_string()), _ => None, }; let sexpr = if let Some(e) = sexpr { e } else if self.cursor < self.buff.len() { let mut stuff = self.buff[self.cursor..].trim().split_whitespace(); if let Some(stuff) = stuff.next() { stuff.to_string() } else { " ".to_string() } } else { "eof".to_string() }; if sexpr == "unsupported" { bail!(ErrorKind::Unsupported) } else { bail!(ErrorKind::ParseError(msg.into(), sexpr)) } } /// Tries to parse a boolean. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// let txt = "\ /// true fls true_ly_bad_ident false; comment\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_bool().expect("bool"), Some(true) ); /// assert_eq!( /// parser.buff_rest(), " fls true_ly_bad_ident false; comment" /// ); /// assert_eq!( parser.try_bool().expect("bool"), None ); /// assert_eq!( /// parser.buff_rest(), "fls true_ly_bad_ident false; comment" /// ); /// parser.tag("fls").expect("tag"); /// assert_eq!( parser.try_bool().expect("bool"), None ); /// assert_eq!( /// parser.buff_rest(), "true_ly_bad_ident false; comment" /// ); /// parser.tag("true_ly_bad_ident").expect("tag"); /// assert_eq!( parser.try_bool().expect("bool"), Some(false) ); /// assert_eq!( /// parser.buff_rest(), "; comment" /// ); /// # } /// ``` pub fn try_bool(&mut self) -> SmtRes<Option<bool>> { if self.try_word("true")? { Ok(Some(true)) } else if self.try_word("false")? { Ok(Some(false)) } else { Ok(None) } } /// Parses a boolean or fails. pub fn bool(&mut self) -> SmtRes<bool> { if let Some(b) = self.try_bool()? { Ok(b) } else { self.fail_with("expected boolean") } } /// Tries to parse an unsigned integer. Does **not** load, backtrack, or mark. /// /// Returns start and end positions. #[inline] fn try_uint_indices(&self) -> SmtRes<Option<(usize, usize)>> { let mut end = self.cursor; let (mut zero_first, mut first) = (false, true); for c in self.buff[self.cursor..].chars() { if c.is_numeric() { if first { first = false; if c == '0' { zero_first = true } } else if zero_first { return Ok(None); } end += 1 } else { break; } } if end > self.cursor { Ok(Some((self.cursor, end))) } else { Ok(None) } } /// Tries to parse an unsigned integer. /// /// Does **not** load, backtrack, or mark, but moves the cursor to the end of the integer if /// any. #[inline] fn try_uint(&mut self) -> SmtRes<Option<&str>> { self.spc_cmt(); if let Some((res_start, res_end)) = self.try_uint_indices()? { self.cursor = res_end; Ok(Some(&self.buff[res_start..res_end])) } else { Ok(None) } } /// Parses an usigned integer or fails. #[inline] fn uint<F, T>(&mut self, f: F) -> SmtRes<T> where F: Fn(&str) -> T, { if let Some(res) = self.try_uint()?.map(f) { Ok(res) } else { self.fail_with("expected unsigned integer") } } /// Tries to parses an integer. /// /// Parameters of the input function: /// /// - the absolute value of the integer parsed, /// - positiveness flag: `true` iff the integer is positive. /// /// **NB**: input function `f` cannot return the input string in any way. Doing so will not /// borrow-check and is completely unsafe as the parser can and in general will discard what's /// in its buffer once it's parsed. /// /// Only recognizes integers of the form /// /// ```bash /// int ::= usize # Not followed by a '.' /// | '(' '-' usize ')' /// usize ::= '0' | [1-9][0-9]* /// ``` /// /// # Examples /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// use std::str::FromStr; /// fn to_int( /// input: & str, positive: bool /// ) -> Result<isize, <isize as FromStr>::Err> { /// isize::from_str(input).map( /// |num| if positive { num } else { - num } /// ) /// } /// let txt = "\ /// 666 (- 11) false; comment\n(+ 31) (= tru)\ /// "; /// let mut parser = SmtParser::of_str(txt); /// println!("666"); /// assert_eq!( parser.try_int(to_int).expect("int"), Some(666) ); /// assert_eq!( /// parser.buff_rest(), " (- 11) false; comment\n" /// ); /// /// println!("- 11"); /// assert_eq!( parser.try_int(to_int).expect("int"), Some(- 11) ); /// assert_eq!( /// parser.buff_rest(), " false; comment\n" /// ); /// /// assert_eq!( parser.try_int(to_int).expect("int"), None ); /// parser.tag("false").expect("tag"); /// /// println!("31"); /// assert_eq!( parser.try_int(to_int).expect("int"), Some(31) ); /// assert_eq!( /// parser.buff_rest(), " (= tru)" /// ); /// /// assert_eq!( parser.try_int(to_int).expect("int"), None ); /// /// let txt = " 7.0 "; /// println!("{}", txt); /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_int(to_int).expect("int"), None ); /// assert_eq!( /// parser.buff_rest(), " 7.0 " /// ); /// /// let txt = " 00 "; /// println!("{}", txt); /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_int(to_int).expect("int"), None ); /// assert_eq!( /// parser.buff_rest(), " 00 " /// ); /// # } /// ``` pub fn try_int<F, T, Err>(&mut self, f: F) -> SmtRes<Option<T>> where F: FnOnce(&str, bool) -> Result<T, Err>, Err: ::std::fmt::Display, { let start_pos = self.pos(); self.load_sexpr()?; let mut res = None; if let Some((int_start, int_end)) = self.try_uint_indices()? { self.cursor = int_end; if self.try_tag(".")? { self.backtrack_to(start_pos); res = None } else { self.cursor = int_end; let uint = &self.buff[int_start..int_end]; try_apply!( f(uint, true) => |int| res = Some(int), format!("error parsing integer `{}`", uint) ) } } else if self.try_tag("(")? { let pos = if self.try_tag("-")? { false } else if self.try_tag("+")? { true } else { self.backtrack_to(start_pos); return Ok(None); }; if let Some(uint) = self.try_uint()? { match f(uint, pos) { Ok(int) => res = Some(int), Err(e) => { let uint = if !pos { format!("(- {})", uint) } else { uint.into() }; bail!("error parsing integer `{}`: {}", uint, e) } } } if !(res.is_some() && self.try_tag(")")?) { self.backtrack_to(start_pos); return Ok(None); } } if res.is_none() { self.backtrack_to(start_pos) } Ok(res) } /// Tries to parses a rational (called *Real* in SMT-LIB). /// /// Parameters of the input function: /// /// - numerator of the rational parsed (> 0), /// - denominator of the rational parsed (> 0), /// - positiveness flag: `true` iff the rational is positive. /// /// Only recognizes integers of the form /// /// ```bash /// rat ::= '(' '/' udec udec ')' /// | '(' '-' '(' '/' udec udec ')' ')' /// | idec /// idec ::= '(' '-' udec '.' usize ')' | udec /// udec ::= usize | usize.0 /// usize ::= [0-9][0-9]* /// ``` /// /// **NB**: input function `f` cannot return the input strings in any way. Doing so will not /// borrow-check and is completely unsafe as the parser can and in general will discard what's /// in its buffer once it's parsed. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// use std::str::FromStr; /// fn to_rat( /// num: & str, den: & str, positive: bool /// ) -> Result<(isize, usize), String> { /// let num = isize::from_str(num).map( /// |num| if positive { num } else { - num } /// ).map_err(|e| format!("{}", e)) ?; /// let den = usize::from_str(den).map_err(|e| format!("{}", e)) ?; /// Ok((num, den)) /// } /// let txt = "\ /// 0.0 666.0 7.42 (- 11.0) false; comment\n(/ 31 27) (- (/ 63 0)) (= tru)\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), Some((0, 1)) ); /// assert_eq!( /// parser.buff_rest(), " 666.0 7.42 (- 11.0) false; comment\n" /// ); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), Some((666, 1)) ); /// assert_eq!( /// parser.buff_rest(), " 7.42 (- 11.0) false; comment\n" /// ); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), Some((742, 100)) ); /// assert_eq!( /// parser.buff_rest(), " (- 11.0) false; comment\n" /// ); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), Some((- 11, 1)) ); /// assert_eq!( /// parser.buff_rest(), " false; comment\n" /// ); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), None ); /// parser.tag("false").expect("tag"); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), Some((31, 27)) ); /// assert_eq!( /// parser.buff_rest(), " (- (/ 63 0)) (= tru)" /// ); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), (Some((- 63, 0))) ); /// /// let txt = " 7 "; /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), None ); /// assert_eq!( /// parser.buff_rest(), " 7 " /// ); /// /// let txt = " (- 7) "; /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_rat(to_rat).expect("rat"), None ); /// assert_eq!( /// parser.buff_rest(), " (- 7) " /// ); /// # } /// ``` pub fn try_rat<F, T, Err>(&mut self, f: F) -> SmtRes<Option<T>> where F: Fn(&str, &str, bool) -> Result<T, Err>, Err: ::std::fmt::Display, { let err = "error parsing rational"; let start_pos = self.pos(); self.load_sexpr()?; let mut res = None; let positive = if self.try_tags(&["(", "-"])? { self.spc_cmt(); false } else { true }; if let Some((fst_start, fst_end)) = self.try_uint_indices()? { if fst_end + 1 < self.buff.len() && &self.buff[fst_end..(fst_end + 2)] == ".0" { try_apply!( f( & self.buff[ fst_start .. fst_end ], "1", positive ) => |okay| res = Some(okay), err ); self.cursor = fst_end + 2 } else if fst_end < self.buff.len() && &self.buff[fst_end..(fst_end + 1)] == "." { self.cursor = fst_end + 1; if let Some((snd_start, snd_end)) = self.try_uint_indices()? { let num = format!( "{}{}", &self.buff[fst_start..fst_end], &self.buff[snd_start..snd_end], ); let mut den = String::with_capacity(snd_end - snd_start); den.push('1'); for _ in snd_start..snd_end { den.push('0') } try_apply!( f( & num, & den, positive ) => |okay| res = Some(okay), err ); self.cursor = snd_end } else { bail!("ill-formed rational") } } else { self.backtrack_to(start_pos); return Ok(None); } } if res.is_none() { if !self.try_tag("(")? { self.backtrack_to(start_pos); return Ok(None); } if !self.try_tag("/")? { self.backtrack_to(start_pos); return Ok(None); } self.spc_cmt(); res = if let Some((num_start, num_end)) = self.try_uint_indices()? { if num_end + 1 < self.buff.len() && &self.buff[num_end..(num_end + 2)] == ".0" { self.cursor = num_end + 2 // } else if num_end < self.buff.len() // && & self.buff[ num_end .. (num_end + 1) ] == "." { // self.cursor = num_end + 1 } else { self.cursor = num_end } self.spc_cmt(); if let Some((den_start, den_end)) = self.try_uint_indices()? { let not_eof = den_end + 1 < self.buff.len(); let point_zero = &self.buff[den_end..(den_end + 2)] == ".0"; if not_eof && point_zero { self.cursor = den_end + 2 // } else if den_end < self.buff.len() // && & self.buff[ den_end .. (den_end + 1) ] == "." { // self.cursor = den_end + 1 } else { self.cursor = den_end } match f( &self.buff[num_start..num_end], &self.buff[den_start..den_end], positive, ) { Ok(res) => Some(res), Err(e) => bail!("error parsing rational: {}", e), } } else { None } } else { None }; if res.is_some() { self.tag(")")? } } if res.is_some() { if !positive { self.tag(")")? } Ok(res) } else { Ok(None) } } /// Tries to parse a symbol. /// /// Quoted symbols (anything but `|` surrounded by `|`) are passed **with** the surrounding `|`. /// /// **NB**: input function `f` cannot return the input string in any way. Doing so will not /// borrow-check and is completely unsafe as the parser can and in general will discard what's /// in its buffer once it's parsed. /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// fn sym(input: & str) -> Result<String, String> { /// Ok( input.into() ) /// } /// let txt = "\ /// ident (- 11) +~stuff; comment\n |some stuff \n [{}!+)(}|\ /// "; /// let mut parser = SmtParser::of_str(txt); /// assert_eq!( parser.try_sym(sym).expect("sym"), Some("ident".into()) ); /// assert_eq!( /// parser.buff_rest(), " (- 11) +~stuff; comment\n" /// ); /// assert_eq!( parser.try_sym(sym).expect("sym"), None ); /// assert_eq!( /// parser.buff_rest(), "(- 11) +~stuff; comment\n" /// ); /// parser.tag("(- 11)").expect("tag"); /// assert_eq!( parser.try_sym(sym).expect("sym"), Some("+~stuff".into()) ); /// assert_eq!( /// parser.buff_rest(), "; comment\n" /// ); /// assert_eq!( /// parser.try_sym(sym).expect("sym"), /// Some("|some stuff \n [{}!+)(}|".into()) /// ); /// # } /// ``` pub fn try_sym<F, T, Err>(&mut self, f: F) -> SmtRes<Option<T>> where F: FnOnce(&str) -> Result<T, Err>, Err: ::std::fmt::Display, { self.spc_cmt(); let err_end = self.load_sexpr()?; let is_sym = if let Some(c) = self.buff[self.cursor..].chars().next() { match c { _ if c.is_alphabetic() => true, '|' | '~' | '!' | '@' | '$' | '%' | '^' | '&' | '*' | '_' | '-' | '+' | '=' | '<' | '>' | '.' | '?' => true, _ => false, } } else { false }; if is_sym { let ident = &self.buff[self.cursor..err_end]; self.cursor = err_end; match f(ident) { Ok(res) => Ok(Some(res)), Err(e) => bail!( "error parsing symbol `{}`: {}", &self.buff[self.cursor..err_end], e ), } } else { Ok(None) } } /// Parses `success`. pub fn success(&mut self) -> SmtRes<()> { self.tag("success") } /// Parses an error. /// /// Returns `Ok(())` if no error was parsed, an error otherwise. /// /// # Examples /// /// ``` /// # extern crate rsmt2; /// # use rsmt2::parse::SmtParser; /// # fn main() { /// use rsmt2::parse::{ IdentParser, ValueParser }; /// use rsmt2::SmtRes; /// let txt = "\ /// ( error \"huge panic\" ) /// "; /// let mut parser = SmtParser::of_str(txt); /// if let Err(e) = parser.try_error() { /// # for e in e.iter() { /// # for line in format!("{}", e).lines() { /// # println!("{}", line) /// # } /// # } /// assert_eq! { & format!("{}", e), "solver error: \"huge panic\"" } /// } else { /// panic!("expected error, got nothing :(") /// } /// # } /// ``` pub fn try_error(&mut self) -> SmtRes<()> { let start_pos = self.pos(); if self.try_tag("(")? { self.spc_cmt(); if self.try_tag("error")? { self.spc_cmt(); if self.try_tag("\"")? { let err_start = self.pos(); let mut err_end = err_start; loop { if err_end < self.buff.len() && &self.buff[err_end..err_end + 1] != "\"" { err_end += 1 } else { break; } } self.cursor = err_end + 1; self.spc_cmt(); self.tag(")").chain_err(|| "closing error message")?; bail!(ErrorKind::SolverError(self.buff[err_start..err_end].into())) } } self.backtrack_to(start_pos) } Ok(()) } /// Parses the result of a check-sat. /// /// Returns `None` if the solver reported `unknown`. pub fn check_sat(&mut self) -> SmtRes<Option<bool>> { self.spc_cmt(); if self.try_tag("sat")? { Ok(Some(true)) } else if self.try_tag("unsat")? { Ok(Some(false)) } else if self.try_tag("unknown")? { Ok(None) } else if self.try_tag("timeout")? { bail!(ErrorKind::Timeout) } else { self.try_error()?; self.fail_with("expected `sat` or `unsat`") } } /// Tries to parse a reserved actlit id. pub fn try_actlit_id(&mut self) -> SmtRes<bool> { if self.try_tag(crate::solver::ACTLIT_PREF)? { self.uint(|_| ()) .chain_err(|| "while parsing internal actlit identifier")?; self.tag(crate::solver::ACTLIT_SUFF)?; Ok(true) } else { Ok(false) } } /// Parses the result of a get-model where all symbols are nullary. pub fn get_model_const<Ident, Value, Type, Parser>( &mut self, prune_actlits: bool, parser: Parser, ) -> SmtRes<Vec<(Ident, Type, Value)>> where Parser: for<'a> IdentParser<Ident, Type, &'a mut Self> + for<'a> ModelParser<Ident, Type, Value, &'a mut Self>, { self.spc_cmt(); self.try_error()?; let mut model = Vec::new(); self.tag("(")?; self.try_tag("model")?; while !self.try_tag(")")? { self.tag_info("(", "opening define-fun or `)` closing model")?; self.tag("define-fun")?; if prune_actlits && self.try_actlit_id()? { self.tags(&["(", ")"])?; self.tag("Bool")?; self.bool()?; } else { let id = parser.parse_ident(self)?; self.tags(&["(", ")"])?; let typ = parser.parse_type(self)?; let value = parser.parse_value(self, &id, &[], &typ)?; model.push((id, typ, value)); } self.tag(")")? } self.clear(); Ok(model) } /// Parses the result of a get-model. pub fn get_model<Ident, Value, Type, Parser>( &mut self, prune_actlits: bool, parser: Parser, ) -> SmtRes<Model<Ident, Type, Value>> where Parser: for<'a> IdentParser<Ident, Type, &'a mut Self> + for<'a> ModelParser<Ident, Type, Value, &'a mut Self>, { self.spc_cmt(); self.try_error()?; let mut model = Vec::new(); self.tag("(")?; self.try_tag("model")?; while !self.try_tag(")")? { self.tag_info("(", "opening define-fun or `)` closing model")?; self.tag("define-fun")?; if prune_actlits && self.try_actlit_id()? { self.tags(&["(", ")"])?; self.tag("Bool")?; self.bool()?; } else { let id = parser.parse_ident(self)?; self.tag("(")?; let mut args = Vec::new(); while self.try_tag("(")? { self.spc_cmt(); let id = parser.parse_ident(self)?; self.spc_cmt(); let typ = parser.parse_type(self)?; self.spc_cmt(); self.tag(")")?; args.push((id, typ)) } self.tag(")")?; self.spc_cmt(); let typ = parser.parse_type(self)?; self.spc_cmt(); let value = parser.parse_value(self, &id, &args, &typ)?; model.push((id, args, typ, value)); } self.tag(")")?; } self.clear(); Ok(model) } /// Parses the result of a get-value. pub fn get_values<Val, Info: Clone, Expr, Parser>( &mut self, parser: Parser, info: Info, ) -> SmtRes<Vec<(Expr, Val)>> where Parser: for<'a> ValueParser<Val, &'a mut Self> + for<'a> ExprParser<Expr, Info, &'a mut Self>, { self.spc_cmt(); self.try_error()?; let mut values = Vec::new(); self.tag("(")?; while !self.try_tag(")")? { self.tag_info("(", "opening expr/value pair or `)` closing value list")?; let expr = parser.parse_expr(self, info.clone())?; let value = parser.parse_value(self)?; values.push((expr, value)); self.tag(")")?; } self.clear(); Ok(values) } } /// Can parse identifiers and types. Used for `get_model`. /// /// For more information refer to the [module-level documentation](self). pub trait IdentParser<Ident, Type, Input>: Copy { /// Parses an identifier. fn parse_ident(self, i: Input) -> SmtRes<Ident>; /// Parses a type. fn parse_type(self, i: Input) -> SmtRes<Type>; } impl<'a, Ident, Type, T> IdentParser<Ident, Type, &'a str> for T where T: IdentParser<Ident, Type, &'a [u8]>, { fn parse_ident(self, input: &'a str) -> SmtRes<Ident> { self.parse_ident(input.as_bytes()) } fn parse_type(self, input: &'a str) -> SmtRes<Type> { self.parse_type(input.as_bytes()) } } impl<'a, Ident, Type, T, Br> IdentParser<Ident, Type, &'a mut SmtParser<Br>> for T where T: IdentParser<Ident, Type, &'a str>, Br: BufRead, { fn parse_ident(self, input: &'a mut SmtParser<Br>) -> SmtRes<Ident> { self.parse_ident(input.get_sexpr()?) } fn parse_type(self, input: &'a mut SmtParser<Br>) -> SmtRes<Type> { self.parse_type(input.get_sexpr()?) } } /// Can parse models. Used for `get-model`. /// /// For more information refer to the [module-level documentation](self). pub trait ModelParser<Ident, Type, Value, Input>: Copy { /// Parses a value in the context of a `get-model` command. /// /// When rsmt2 parses a value for some symbol `id` in a model, it will call this function so /// that it knows what to construct the value with. Remember that in a model, values are usually /// presented as /// /// ```lisp /// (define-fun <symbol> ( (<arg> <arg_sort>) ... ) <out_sort> <value>) /// ``` /// /// This function's purpose is to parse `<value>` and construct an actual `Value`, given all the /// information preceeding the `<value>` token. So, parameter /// /// - `i` is the "Text input", the actual value token tree (`<value>`); /// - `id` is the symbol (`symbol`) we're parsing the value of; /// - `args` is `id`'s "input signature" (`(<arg> <arg_sort>) ...`); /// - `out` is `id`'s output sort (`<out_sort>`). fn parse_value(self, i: Input, id: &Ident, args: &[(Ident, Type)], out: &Type) -> SmtRes<Value>; } impl<'a, Ident, Type, Value, T> ModelParser<Ident, Type, Value, &'a str> for T where T: ModelParser<Ident, Type, Value, &'a [u8]>, { fn parse_value( self, input: &'a str, name: &Ident, inputs: &[(Ident, Type)], output: &Type, ) -> SmtRes<Value> { self.parse_value(input.as_bytes(), name, inputs, output) } } impl<'a, Ident, Type, Value, T, Br> ModelParser<Ident, Type, Value, &'a mut SmtParser<Br>> for T where T: ModelParser<Ident, Type, Value, &'a str>, Br: BufRead, { fn parse_value( self, input: &'a mut SmtParser<Br>, name: &Ident, inputs: &[(Ident, Type)], output: &Type, ) -> SmtRes<Value> { self.parse_value(input.get_sexpr()?, name, inputs, output) } } /// Can parse values. Used for `get-value`. /// /// For more information refer to the [module-level documentation](self). pub trait ValueParser<Value, Input>: Copy { /// Parses a plain value. fn parse_value(self, i: Input) -> SmtRes<Value>; } impl<'a, Value, T> ValueParser<Value, &'a str> for T where T: ValueParser<Value, &'a [u8]>, { fn parse_value(self, input: &'a str) -> SmtRes<Value> { self.parse_value(input.as_bytes()) } } impl<'a, Value, T, Br> ValueParser<Value, &'a mut SmtParser<Br>> for T where T: ValueParser<Value, &'a str>, Br: BufRead, { fn parse_value(self, input: &'a mut SmtParser<Br>) -> SmtRes<Value> { self.parse_value(input.get_sexpr()?) } } /// Can parse expressions. Used for `get_value`. /// /// For more information refer to the [module-level documentation](self). pub trait ExprParser<Expr, Info, Input>: Copy { fn parse_expr(self, i: Input, info: Info) -> SmtRes<Expr>; } impl<'a, Expr, Info, T> ExprParser<Expr, Info, &'a str> for T where T: ExprParser<Expr, Info, &'a [u8]>, { fn parse_expr(self, input: &'a str, info: Info) -> SmtRes<Expr> { self.parse_expr(input.as_bytes(), info) } } impl<'a, Expr, Info, T, Br> ExprParser<Expr, Info, &'a mut SmtParser<Br>> for T where T: ExprParser<Expr, Info, &'a str>, Br: BufRead, { fn parse_expr(self, input: &'a mut SmtParser<Br>, info: Info) -> SmtRes<Expr> { self.parse_expr(input.get_sexpr()?, info) } } /// Can parse proofs. Currenly unused. /// /// For more information refer to the [module-level documentation](self). pub trait ProofParser<Proof, Input>: Copy { fn parse_proof(self, i: Input) -> SmtRes<Proof>; } impl<'a, Proof, T> ProofParser<Proof, &'a str> for T where T: ProofParser<Proof, &'a [u8]>, { fn parse_proof(self, input: &'a str) -> SmtRes<Proof> { self.parse_proof(input.as_bytes()) } } impl<'a, Proof, T, Br> ProofParser<Proof, &'a mut SmtParser<Br>> for T where T: ProofParser<Proof, &'a str>, Br: BufRead, { fn parse_proof(self, input: &'a mut SmtParser<Br>) -> SmtRes<Proof> { self.parse_proof(input.get_sexpr()?) } }