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//! Solver configuration, contains backend-solver-specific info.
//!
//! Do **NOT** use wildcards when matching over `SmtStyle`. We want the code to fail to compile
//! whenever we add a solver. Likewise, do not use `if let` with `SmtStyle`.
//!
//! Note that the command for each solver can be passed through environment variables, see
//! - [`Z3_ENV_VAR`],
//! - [`CVC4_ENV_VAR`],
//! - [`YICES_2_ENV_VAR`], and
//! - the [`SmtConf::z3_or_env`], [`SmtConf::cvc4_or_env`], and [`SmtConf::yices_2_or_env`]
//! constructors.
use std::fmt;
use crate::{SmtRes, Solver};
use self::SmtStyle::*;
/// A configuration item is either a keyword or unsupported.
pub type ConfItem = Option<&'static str>;
/// Value of an unsupported configuration item.
#[inline]
fn unsupported() -> ConfItem {
None
}
/// Keyword for a configuration item.
#[inline]
fn supported(keyword: &'static str) -> ConfItem {
Some(keyword)
}
/// Environment variable providing the command for z3.
pub const Z3_ENV_VAR: &str = "RSMT2_Z3_CMD";
/// Environment variable providing the command for CVC4.
pub const CVC4_ENV_VAR: &str = "RSMT2_CVC4_CMD";
/// Environment variable providing the command for Yices 2.
pub const YICES_2_ENV_VAR: &str = "RSMT2_YICES_2_CMD";
/// Retrieves the value of an environment variable.
fn get_env_var(env_var: &str) -> SmtRes<Option<String>> {
match std::env::var(env_var) {
Ok(res) => Ok(Some(res)),
Err(std::env::VarError::NotPresent) => Ok(None),
Err(std::env::VarError::NotUnicode(cmd)) => bail!(
"value of environment variable `{}` is not legal unicode: `{}`",
env_var,
cmd.to_string_lossy(),
),
}
}
/// Solver styles.
///
/// - [z3][z3]: full support
/// - [cvc4][cvc4]: full support in theory, but only partially tested. Note that `get-value` is
/// known to crash some versions of CVC4.
/// - [yices 2][yices 2]: full support in theory, but only partially tested. Command `get-model`
/// will only work on Yices 2 > `2.6.1`, and needs to be activated in [`SmtConf`] with
/// [`SmtConf::models`]. To understand why, see <https://github.com/SRI-CSL/yices2/issues/162>.
///
/// [z3]: https://github.com/Z3Prover/z3 (z3 github repository)
/// [cvc4]: https://cvc4.github.io/ (cvc4 github pages)
/// [yices 2]: https://yices.csl.sri.com/ (yices 2 official page)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[allow(dead_code)]
pub enum SmtStyle {
/// Z3-style smt solver.
Z3,
/// CVC4-style smt solver.
///
/// **NB**: CVC4 has only been partially tested at this point.
CVC4,
/// Yices-2-style smt solver.
///
/// **NB**: Yices 2 has only been partially tested at this point.
Yices2,
}
impl SmtStyle {
/// Configuration constructor.
pub fn new(self, cmd: impl Into<String>) -> SmtConf {
let cmd = cmd.into();
match self {
Z3 => SmtConf {
style: self,
cmd,
options: vec!["-in".into(), "-smt2".into()],
models: true,
incremental: true,
check_success: false,
unsat_cores: false,
interpolants: true,
check_sat_assuming: supported("check-sat-assuming"),
},
CVC4 => SmtConf {
style: self,
cmd,
options: vec![
"-q".into(),
"--no-interactive".into(),
"--lang".into(),
"smt2".into(),
],
models: false,
incremental: false,
check_success: false,
unsat_cores: false,
interpolants: false,
check_sat_assuming: unsupported(),
},
Yices2 => SmtConf {
style: self,
cmd,
options: vec![],
models: false,
incremental: false,
check_success: false,
unsat_cores: false,
interpolants: false,
check_sat_assuming: supported("check-sat-assuming"),
},
}
}
/// Default configuration for a solver style.
///
/// # Warning
///
/// The command used to run a particular solver is up to the end-user. As such, it **does not
/// make sense** to use default commands for anything else than local testing. You should
/// explicitely pass the command to use with [`Self::new`] instead.
pub fn default(self) -> SmtConf {
self.new(self.cmd())
}
/// A solver style from a string.
#[allow(dead_code)]
pub fn of_str(s: &str) -> Option<Self> {
match s {
"z3" | "Z3" => Some(Z3),
"cvc4" | "CVC4" => Some(CVC4),
"Yices2" | "yices2" | "YICES2" | "Yices 2" | "yices 2" | "YICES 2" => Some(Yices2),
_ => None,
}
}
/// Legal string representations of solver styles.
#[allow(dead_code)]
pub fn str_keys() -> Vec<&'static str> {
vec![
"z3", "Z3", "cvc4", "CVC4", "Yices2", "yices2", "YICES2", "Yices 2", "yices 2",
"YICES 2",
]
}
/// Solver style command from the corresponding environment variable.
///
/// The environement variables scanned are [`Z3_ENV_VAR`], [`CVC4_ENV_VAR`] and
/// [`YICES_2_ENV_VAR`].
pub fn env_cmd(self) -> SmtRes<Option<String>> {
match self {
Z3 => get_env_var(Z3_ENV_VAR),
CVC4 => get_env_var(CVC4_ENV_VAR),
Yices2 => get_env_var(YICES_2_ENV_VAR),
}
}
/// Default command for a solver style.
#[cfg(not(windows))]
pub fn cmd(self) -> &'static str {
match self {
Z3 => "z3",
CVC4 => "cvc4",
Yices2 => "yices",
}
}
/// Default command for a solver style.
#[cfg(windows)]
pub fn cmd(self) -> &'static str {
match self {
Z3 => "z3.exe",
CVC4 => "cvc4.exe",
Yices2 => "yices.exe",
}
}
/// True if `self` is [`Self::Z3`].
pub fn is_z3(self) -> bool {
self == Self::Z3
}
}
impl fmt::Display for SmtStyle {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
Z3 => write!(fmt, "z3"),
CVC4 => write!(fmt, "cvc4"),
Yices2 => write!(fmt, "yices2"),
}
}
}
/// Configuration and solver specific info.
///
/// - [z3]: full support
/// - [cvc4]: full support in theory, but only partially tested. Note that `get-value` is
/// known to crash some versions of CVC4.
/// - [yices 2]: full support in theory, but only partially tested. Command `get-model`
/// will only work on Yices 2 > `2.6.1`, and needs to be activated with [`Self::models`]. To
/// understand why, see <https://github.com/SRI-CSL/yices2/issues/162>.
///
/// [z3]: https://github.com/Z3Prover/z3 (z3 github repository)
/// [cvc4]: https://cvc4.github.io/ (cvc4 github pages)
/// [yices 2]: https://yices.csl.sri.com/ (yices 2 official page)
#[derive(Debug, Clone)]
pub struct SmtConf {
/// Solver style.
style: SmtStyle,
/// Solver command.
cmd: String,
/// Options to call the solver with.
options: Vec<String>,
/// Model production.
models: bool,
/// Incrementality.
incremental: bool,
/// Parse success.
check_success: bool,
/// Triggers unsat-core production.
unsat_cores: bool,
/// Triggers interpolant production.
interpolants: bool,
/// Keyword for check-sat with assumptions.
check_sat_assuming: ConfItem,
}
impl SmtConf {
/// Solver style accessor.
pub fn style(&self) -> SmtStyle {
self.style
}
/// Creates a new z3-like solver configuration.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::z3("my_z3_command");
/// assert!(conf.get_cmd() == "my_z3_command")
/// ```
#[inline]
pub fn z3(cmd: impl Into<String>) -> Self {
Z3.new(cmd)
}
/// Creates a new cvc4-like solver configuration.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::cvc4("my_cvc4_command");
/// assert!(conf.get_cmd() == "my_cvc4_command")
/// ```
#[inline]
pub fn cvc4(cmd: impl Into<String>) -> Self {
CVC4.new(cmd)
}
/// Creates a new yices-2-like solver configuration.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::yices_2("my_yices_2_command");
/// assert!(conf.get_cmd() == "my_yices_2_command")
/// ```
#[inline]
pub fn yices_2(cmd: impl Into<String>) -> Self {
Yices2.new(cmd)
}
/// Creates a z3-like solver configuration from an optional, or the value of the [`Z3_ENV_VAR`]
/// environment variable.
///
/// Fails if `cmd.is_none()` and [`Z3_ENV_VAR`] is not set.
///
/// ```rust
/// use rsmt2::conf::{SmtConf, Z3_ENV_VAR};
/// use std::env::{set_var, var_os};
///
/// // Passes the command directly.
/// let cmd = "z3_explicit";
/// let explicit_cmd = SmtConf::z3_or_env(Some(cmd.into())).expect("explicit");
/// assert_eq!(explicit_cmd.get_cmd(), cmd);
///
/// // Error if no command + environment variable not set.
/// assert_eq!(var_os(Z3_ENV_VAR), None);
/// let error = SmtConf::z3_or_env(None);
/// match error {
/// Ok(_) => panic!("expected error, got an SMT style"),
/// Err(e) => assert_eq!(
/// &e.to_string(),
/// "no command for z3 provided, \
/// and `RSMT2_Z3_CMD` environment variable not set; \
/// cannot spawn z3 solver"
/// ),
/// }
///
/// // Retrieves the command from the environment.
/// let cmd = "z3_implicit";
/// assert_eq!(Z3_ENV_VAR, "RSMT2_Z3_CMD");
/// set_var(Z3_ENV_VAR, cmd);
/// let implicit_cmd = SmtConf::z3_or_env(None).expect("implicit");
/// assert_eq!(implicit_cmd.get_cmd(), cmd);
/// ```
#[inline]
pub fn z3_or_env(cmd: Option<String>) -> SmtRes<Self> {
if let Some(cmd) = cmd {
Ok(Self::z3(cmd))
} else {
let cmd = SmtStyle::Z3.env_cmd()?;
if let Some(cmd) = cmd {
Ok(Self::z3(cmd))
} else {
bail!(
"no command for z3 provided, \
and `{}` environment variable not set; cannot spawn z3 solver",
Z3_ENV_VAR,
)
}
}
}
/// Creates a CVC4-like solver configuration from an optional, or the value of the
/// [`CVC4_ENV_VAR`] environment variable.
///
/// Fails if `cmd.is_none()` and [`CVC4_ENV_VAR`] is not set.
///
/// ```rust
/// use rsmt2::conf::{SmtConf, CVC4_ENV_VAR};
/// use std::env::{set_var, var_os};
///
/// // Passes the command directly.
/// let cmd = "cvc4_explicit";
/// let explicit_cmd = SmtConf::cvc4_or_env(Some(cmd.into())).expect("explicit");
/// assert_eq!(explicit_cmd.get_cmd(), cmd);
///
/// // Error if no command + environment variable not set.
/// assert_eq!(var_os(CVC4_ENV_VAR), None);
/// let error = SmtConf::cvc4_or_env(None);
/// match error {
/// Ok(_) => panic!("expected error, got an SMT style"),
/// Err(e) => assert_eq!(
/// &e.to_string(),
/// "no command for CVC4 provided, \
/// and `RSMT2_CVC4_CMD` environment variable not set; \
/// cannot spawn CVC4 solver"
/// ),
/// }
///
/// // Retrieves the command from the environment.
/// let cmd = "cvc4_implicit";
/// assert_eq!(CVC4_ENV_VAR, "RSMT2_CVC4_CMD");
/// set_var(CVC4_ENV_VAR, cmd);
/// let implicit_cmd = SmtConf::cvc4_or_env(None).expect("implicit");
/// assert_eq!(implicit_cmd.get_cmd(), cmd);
/// ```
#[inline]
pub fn cvc4_or_env(cmd: Option<String>) -> SmtRes<Self> {
if let Some(cmd) = cmd {
Ok(Self::cvc4(cmd))
} else {
let cmd = SmtStyle::CVC4.env_cmd()?;
if let Some(cmd) = cmd {
Ok(Self::cvc4(cmd))
} else {
bail!(
"no command for CVC4 provided, \
and `{}` environment variable not set; cannot spawn CVC4 solver",
CVC4_ENV_VAR,
)
}
}
}
/// Creates a Yices-2-like solver configuration from an optional, or the value of the
/// [`YICES_2_ENV_VAR`] environment variable.
///
/// Fails if `cmd.is_none()` and [`YICES_2_ENV_VAR`] is not set.
///
/// ```rust
/// use rsmt2::conf::{SmtConf, YICES_2_ENV_VAR};
/// use std::env::{set_var, var_os};
///
/// // Passes the command directly.
/// let cmd = "yices_2_explicit";
/// let explicit_cmd = SmtConf::yices_2_or_env(Some(cmd.into())).expect("explicit");
/// assert_eq!(explicit_cmd.get_cmd(), cmd);
///
/// // Error if no command + environment variable not set.
/// assert_eq!(var_os(YICES_2_ENV_VAR), None);
/// let error = SmtConf::yices_2_or_env(None);
/// match error {
/// Ok(_) => panic!("expected error, got an SMT style"),
/// Err(e) => assert_eq!(
/// &e.to_string(),
/// "no command for Yices 2 provided, \
/// and `RSMT2_YICES_2_CMD` environment variable not set; \
/// cannot spawn Yices 2 solver"
/// ),
/// }
///
/// // Retrieves the command from the environment.
/// let cmd = "yices_2_implicit";
/// assert_eq!(YICES_2_ENV_VAR, "RSMT2_YICES_2_CMD");
/// set_var(YICES_2_ENV_VAR, cmd);
/// let implicit_cmd = SmtConf::yices_2_or_env(None).expect("implicit");
/// assert_eq!(implicit_cmd.get_cmd(), cmd);
/// ```
#[inline]
pub fn yices_2_or_env(cmd: Option<String>) -> SmtRes<Self> {
if let Some(cmd) = cmd {
Ok(Self::yices_2(cmd))
} else {
let cmd = SmtStyle::Yices2.env_cmd()?;
if let Some(cmd) = cmd {
Ok(Self::yices_2(cmd))
} else {
bail!(
"no command for Yices 2 provided, \
and `{}` environment variable not set; cannot spawn Yices 2 solver",
YICES_2_ENV_VAR,
)
}
}
}
/// Creates a new z3-like solver configuration and command.
///
/// # Warning
///
/// The command used to run a particular solver is up to the end-user. As such, it **does not
/// make sense** to use default commands for anything else than local testing. You should
/// explicitely pass the command to use with [`Self::z3`] instead.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::default_z3();
/// assert! {
/// conf.get_cmd() == "z3" || conf.get_cmd() == "z3.exe"
/// }
/// ```
#[inline]
pub fn default_z3() -> Self {
Z3.default()
}
/// Creates a new cvc4-like solver configuration and command.
///
/// # Warning
///
/// The command used to run a particular solver is up to the end-user. As such, it **does not
/// make sense** to use default commands for anything else than local testing. You should
/// explicitely pass the command to use with [`Self::cvc4`] instead.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::default_cvc4();
/// assert! {
/// conf.get_cmd() == "cvc4" || conf.get_cmd() == "cvc4.exe"
/// }
/// ```
#[inline]
pub fn default_cvc4() -> Self {
CVC4.default()
}
/// Creates a new yices-2-like solver configuration and command.
///
/// # Warning
///
/// The command used to run a particular solver is up to the end-user. As such, it **does not
/// make sense** to use default commands for anything else than local testing. You should
/// explicitely pass the command to use with [`Self::yices_2`] instead.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::default_yices_2();
/// assert! {
/// conf.get_cmd() == "yices" || conf.get_cmd() == "yices.exe"
/// }
/// ```
#[inline]
pub fn default_yices_2() -> Self {
Yices2.default()
}
/// Spawns the solver.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let _solver = SmtConf::default_z3().spawn(()).unwrap();
/// ```
#[inline]
pub fn spawn<Parser>(self, parser: Parser) -> SmtRes<Solver<Parser>> {
Solver::new(self, parser)
}
/// Concise description of the underlying solver.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert_eq! { SmtConf::default_z3().desc(), "z3" }
/// ```
#[inline]
pub fn desc(&self) -> &str {
match self.style {
Z3 => "z3",
CVC4 => "cvc4",
Yices2 => "yices2",
}
}
/// Solver command.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let conf = SmtConf::default_z3();
/// assert! {
/// conf.get_cmd() == "z3" || conf.get_cmd() == "z3.exe"
/// }
/// ```
#[inline]
pub fn get_cmd(&self) -> &str {
&self.cmd
}
/// Options of the configuration.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert_eq! {
/// SmtConf::default_z3().get_options(), & [ "-in", "-smt2" ]
/// }
/// ```
#[inline]
pub fn get_options(&self) -> &[String] {
&self.options
}
/// Adds an option to the configuration.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.option("arith.euclidean_solver=true");
/// assert_eq! {
/// conf.get_options(),
/// & [ "-in", "-smt2", "arith.euclidean_solver=true" ]
/// }
/// ```
#[inline]
pub fn option<S: Into<String>>(&mut self, o: S) -> &mut Self {
self.options.push(o.into());
self
}
/// Sets the command for the solver.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.cmd("my_custom_z3_command");
/// assert_eq! { conf.get_cmd(), "my_custom_z3_command" }
/// ```
#[inline]
pub fn cmd<S: Into<String>>(&mut self, cmd: S) -> &mut Self {
let cmd = cmd.into();
let mut iter = cmd.split(' ');
'set_cmd: while let Some(cmd) = iter.next() {
if !cmd.is_empty() {
self.cmd = cmd.into();
break 'set_cmd;
}
}
for option in iter {
if !option.is_empty() {
self.options.push(option.into())
}
}
self
}
/// Model production flag.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert!(SmtConf::default_z3().get_models());
/// ```
pub fn get_models(&self) -> bool {
self.models
}
/// Activates model production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.models();
/// assert!(conf.get_models());
/// ```
pub fn models(&mut self) {
self.set_models(true)
}
/// (De)activates model production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.set_models(false);
/// assert!(!conf.get_models());
/// ```
pub fn set_models(&mut self, val: bool) {
self.models = val;
if val {
match self.style {
CVC4 => self.options.push("--produce-models".into()),
Yices2 => self.options.push("--smt2-model-format".into()),
Z3 => (),
}
}
}
/// Incrementality.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// assert!(conf.get_incremental());
/// ```
pub fn get_incremental(&self) -> bool {
self.incremental
}
/// Activates incrementality (push/pop, check-sat-assuming).
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.incremental();
/// assert!(conf.get_incremental());
/// ```
pub fn incremental(&mut self) {
self.set_incremental(true)
}
/// Activates incrementality (push/pop, check-sat-assuming).
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.incremental();
/// assert!(conf.get_incremental());
/// ```
pub fn set_incremental(&mut self, val: bool) {
self.incremental = val;
if val {
match self.style {
CVC4 | Yices2 => self.options.push("--incremental".into()),
Z3 => (),
}
}
}
/// Indicates if unsat core production is active.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert!(! SmtConf::default_z3().get_unsat_cores());
/// ```
#[inline]
pub fn get_unsat_cores(&self) -> bool {
self.unsat_cores
}
/// Activates unsat core production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.unsat_cores();
/// assert!(conf.get_unsat_cores());
/// ```
#[inline]
pub fn unsat_cores(&mut self) {
self.set_unsat_cores(true)
}
/// (De)activates unsat core production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.set_unsat_cores(false);
/// assert!(!conf.get_unsat_cores());
/// ```
#[inline]
pub fn set_unsat_cores(&mut self, val: bool) {
self.unsat_cores = val
}
/// Keyword for check-sat with assumptions.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert_eq! {
/// SmtConf::default_z3().get_check_sat_assuming(), Some("check-sat-assuming")
/// }
/// ```
#[inline]
pub fn get_check_sat_assuming(&self) -> ConfItem {
self.check_sat_assuming.as_ref().map(|s| *s)
}
/// Indicates if success-checking is active, see [`Solver`](crate::Solver#check-success).
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert!(! SmtConf::default_z3().get_check_success());
/// ```
#[inline]
pub fn get_check_success(&self) -> bool {
self.check_success
}
/// Activates success-checking, see [`Solver`](crate::Solver#check-success).
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.check_success();
/// assert!(conf.get_check_success());
/// ```
#[inline]
pub fn check_success(&mut self) {
self.set_check_success(true)
}
/// (De)activates sucess-checking, see [`Solver`](crate::Solver#check-success).
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.set_check_success(true);
/// assert!(conf.get_check_success());
/// ```
#[inline]
pub fn set_check_success(&mut self, val: bool) {
self.check_success = val
}
/// Indicates if interpolant production is active.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// assert!(SmtConf::default_z3().get_interpolants());
/// ```
#[inline]
pub fn get_interpolants(&self) -> bool {
self.interpolants
}
/// Activates interpolant production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.interpolants();
/// assert!(conf.get_interpolants());
/// ```
#[inline]
pub fn interpolants(&mut self) -> SmtRes<()> {
self.set_interpolants(true)
}
/// (De)activates interpolant production.
///
/// # Examples
///
/// ```rust
/// # use rsmt2::SmtConf;
/// let mut conf = SmtConf::default_z3();
/// conf.set_interpolants(false);
/// assert!(!conf.get_interpolants());
/// ```
#[inline]
pub fn set_interpolants(&mut self, val: bool) -> SmtRes<()> {
if self.style.is_z3() {
self.interpolants = val;
Ok(())
} else {
bail!(
"interpolant production is only supported by Z3, \
cannot activate interpolants for `{}`",
self.style,
)
}
}
}
/// ## Solver-specific error-handling
impl SmtConf {
/// Adds information to a `get-value` error message if needed.
pub fn enrich_get_values_error(&self, e: crate::errors::Error) -> crate::errors::Error {
match self.style {
SmtStyle::CVC4 => e.chain_err(|| {
"some versions of CVC4 produce errors on `get-value` commands, \
consider using `get-model` instead"
}),
SmtStyle::Z3 | SmtStyle::Yices2 => e,
}
}
}