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use crate::any::Dynamic;
use crate::engine::{Engine, EvalContext, MARKER_BLOCK, MARKER_EXPR, MARKER_IDENT};
use crate::error::{LexError, ParseError};
use crate::fn_native::{SendSync, Shared};
use crate::parser::Expr;
use crate::result::EvalAltResult;
use crate::scope::Scope;
use crate::token::{is_valid_identifier, Position, Token};
use crate::StaticVec;
use crate::stdlib::{
boxed::Box,
fmt, format,
string::{String, ToString},
};
#[cfg(not(feature = "sync"))]
pub type FnCustomSyntaxEval =
dyn Fn(&mut Scope, &mut EvalContext, &[Expression]) -> Result<Dynamic, Box<EvalAltResult>>;
#[cfg(feature = "sync")]
pub type FnCustomSyntaxEval = dyn Fn(&mut Scope, &mut EvalContext, &[Expression]) -> Result<Dynamic, Box<EvalAltResult>>
+ Send
+ Sync;
#[derive(Debug, Clone, Hash)]
pub struct Expression<'a>(&'a Expr);
impl<'a> From<&'a Expr> for Expression<'a> {
#[inline(always)]
fn from(expr: &'a Expr) -> Self {
Self(expr)
}
}
impl Expression<'_> {
#[inline(always)]
pub fn get_variable_name(&self) -> Option<&str> {
match self.0 {
Expr::Variable(x) => Some((x.0).0.as_str()),
_ => None,
}
}
#[inline(always)]
pub(crate) fn expr(&self) -> &Expr {
&self.0
}
#[inline(always)]
pub fn position(&self) -> Position {
self.0.position()
}
}
impl EvalContext<'_, '_, '_, '_, '_, '_> {
#[inline(always)]
pub fn eval_expression_tree(
&mut self,
scope: &mut Scope,
expr: &Expression,
) -> Result<Dynamic, Box<EvalAltResult>> {
self.engine.eval_expr(
scope,
self.mods,
self.state,
self.lib,
self.this_ptr,
expr.expr(),
self.level,
)
}
}
#[derive(Clone)]
pub struct CustomSyntax {
pub segments: StaticVec<String>,
pub func: Shared<FnCustomSyntaxEval>,
pub scope_delta: isize,
}
impl fmt::Debug for CustomSyntax {
#[inline(always)]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(&self.segments, f)
}
}
impl Engine {
pub fn register_custom_syntax<S: AsRef<str> + ToString>(
&mut self,
keywords: &[S],
new_vars: isize,
func: impl Fn(&mut Scope, &mut EvalContext, &[Expression]) -> Result<Dynamic, Box<EvalAltResult>>
+ SendSync
+ 'static,
) -> Result<&mut Self, ParseError> {
let mut segments: StaticVec<_> = Default::default();
for s in keywords {
let s = s.as_ref().trim();
if s.is_empty() {
continue;
}
let seg = match s {
MARKER_EXPR | MARKER_BLOCK | MARKER_IDENT if !segments.is_empty() => s.to_string(),
s if !segments.is_empty() && Token::lookup_from_syntax(s).is_some() => {
if self
.disabled_symbols
.as_ref()
.map(|d| d.contains(s))
.unwrap_or(false)
|| Token::lookup_from_syntax(s)
.map(|token| token.is_reserved())
.unwrap_or(false)
{
if self.custom_keywords.is_none() {
self.custom_keywords = Some(Default::default());
}
if !self.custom_keywords.as_ref().unwrap().contains_key(s) {
self.custom_keywords.as_mut().unwrap().insert(s.into(), 0);
}
}
s.into()
}
s if is_valid_identifier(s.chars()) => {
if self.custom_keywords.is_none() {
self.custom_keywords = Some(Default::default());
}
if !self.custom_keywords.as_ref().unwrap().contains_key(s) {
self.custom_keywords.as_mut().unwrap().insert(s.into(), 0);
}
s.into()
}
_ => {
return Err(LexError::ImproperSymbol(format!(
"Improper symbol for custom syntax: '{}'",
s
))
.into_err(Position::none())
.into());
}
};
segments.push(seg);
}
if segments.is_empty() {
return Ok(self);
}
let key = segments.remove(0);
let syntax = CustomSyntax {
segments,
func: (Box::new(func) as Box<FnCustomSyntaxEval>).into(),
scope_delta: new_vars,
};
if self.custom_syntax.is_none() {
self.custom_syntax = Some(Default::default());
}
self.custom_syntax
.as_mut()
.unwrap()
.insert(key, syntax.into());
Ok(self)
}
}