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invocation.rs
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use std::mem::swap;
use heraclitus_compiler::prelude::*;
use itertools::izip;
use crate::docs::module::DocumentationModule;
use crate::modules::command::modifier::CommandModifier;
use crate::modules::condition::failed::Failed;
use crate::modules::types::{Type, Typed};
use crate::modules::variable::variable_name_extensions;
use crate::utils::metadata::{ParserMetadata, TranslateMetadata};
use crate::translate::module::TranslateModule;
use crate::modules::expression::expr::Expr;
use super::invocation_utils::*;
#[derive(Debug, Clone)]
pub struct FunctionInvocation {
name: String,
args: Vec<Expr>,
refs: Vec<bool>,
kind: Type,
variant_id: usize,
id: usize,
line: usize,
col: usize,
failed: Failed,
modifier: CommandModifier,
is_failable: bool
}
impl Typed for FunctionInvocation {
fn get_type(&self) -> Type {
self.kind.clone()
}
}
impl SyntaxModule<ParserMetadata> for FunctionInvocation {
syntax_name!("Function Invocation");
fn new() -> Self {
FunctionInvocation {
name: String::new(),
args: vec![],
refs: vec![],
kind: Type::Null,
variant_id: 0,
id: 0,
line: 0,
col: 0,
failed: Failed::new(),
modifier: CommandModifier::new().parse_expr(),
is_failable: false
}
}
fn parse(&mut self, meta: &mut ParserMetadata) -> SyntaxResult {
syntax(meta, &mut self.modifier)?;
self.modifier.use_modifiers(meta, |_this, meta| {
// Get the function name
let tok = meta.get_current_token();
if let Some(ref tok) = tok {
self.line = tok.pos.0;
self.col = tok.pos.1;
}
self.name = variable(meta, variable_name_extensions())?;
// Get the arguments
token(meta, "(")?;
self.id = handle_function_reference(meta, tok.clone(), &self.name)?;
loop {
if token(meta, ")").is_ok() {
break
}
let mut expr = Expr::new();
syntax(meta, &mut expr)?;
self.args.push(expr);
match token(meta, ")") {
Ok(_) => break,
Err(_) => token(meta, ",")?
};
}
let function_unit = meta.get_fun_declaration(&self.name).unwrap().clone();
let expected_arg_count = function_unit.arg_refs.len();
let actual_arg_count = self.args.len();
let optional_count = function_unit.arg_optionals.len();
// Case when function call is missing arguments
if actual_arg_count < expected_arg_count {
// Check if we can compensate with optional arguments stored in fun_unit
if actual_arg_count >= expected_arg_count - optional_count {
let missing = expected_arg_count - actual_arg_count;
let provided_optional = optional_count - missing;
for exp in function_unit.arg_optionals.iter().skip(provided_optional){
self.args.push(exp.clone());
}
}
}
let types = self.args.iter().map(|e| e.get_type()).collect::<Vec<Type>>();
let var_names = self.args.iter().map(|e| e.is_var()).collect::<Vec<bool>>();
self.refs.clone_from(&function_unit.arg_refs);
(self.kind, self.variant_id) = handle_function_parameters(meta, self.id, function_unit.clone(), &types, &var_names, tok.clone())?;
self.is_failable = function_unit.is_failable;
if self.is_failable {
match syntax(meta, &mut self.failed) {
Ok(_) => if let Type::Failable(t) = &self.kind {
self.kind = *t.clone();
},
Err(Failure::Quiet(_)) => return error!(meta, tok => {
message: "This function can fail. Please handle the failure",
comment: "You can use '?' in the end to propagate the failure"
}),
Err(err) => return Err(err)
}
} else {
let tok = meta.get_current_token();
if let Ok(symbol) = token_by(meta, |word| ["?", "failed"].contains(&word.as_str())) {
let message = Message::new_warn_at_token(meta, tok)
.message("This function cannot fail")
.comment(format!("You can remove the '{symbol}' in the end"));
meta.add_message(message);
}
}
Ok(())
})
}
}
impl FunctionInvocation {
fn get_variable(&self, meta: &TranslateMetadata, name: &str, dollar_override: bool) -> String {
let dollar = dollar_override.then_some("$").unwrap_or_else(|| meta.gen_dollar());
let quote = meta.gen_quote();
if matches!(self.kind, Type::Array(_)) {
format!("{quote}{dollar}{{{name}[@]}}{quote}")
} else if matches!(self.kind, Type::Text) {
format!("{quote}{dollar}{{{name}}}{quote}")
} else {
format!("{quote}{dollar}{name}{quote}")
}
}
}
impl TranslateModule for FunctionInvocation {
fn translate(&self, meta: &mut TranslateMetadata) -> String {
let name = format!("{}__{}_v{}", self.name, self.id, self.variant_id);
let mut is_silent = self.modifier.is_silent || meta.silenced;
swap(&mut is_silent, &mut meta.silenced);
let silent = meta.gen_silent();
let args = izip!(self.args.iter(), self.refs.iter()).map(| (arg, is_ref) | {
if *is_ref {
arg.get_var_translated_name().unwrap()
} else {
let translation = arg.translate_eval(meta, false);
// If the argument is an array, we have to get just the "name[@]" part
(translation.starts_with("\"${") && translation.ends_with("[@]}\""))
.then(|| translation.get(3..translation.len() - 2).unwrap().to_string())
.unwrap_or(translation)
}
}).collect::<Vec<String>>().join(" ");
meta.stmt_queue.push_back(format!("{name} {args}{silent}"));
let invocation_return = &format!("__AF_{}{}_v{}", self.name, self.id, self.variant_id);
let invocation_instance = &format!("__AF_{}{}_v{}__{}_{}", self.name, self.id, self.variant_id, self.line, self.col);
let parsed_invocation_return = self.get_variable(meta, invocation_return, true);
swap(&mut is_silent, &mut meta.silenced);
if self.is_failable {
let failed = self.failed.translate(meta);
meta.stmt_queue.push_back(failed);
}
meta.stmt_queue.push_back(
format!("__AF_{}{}_v{}__{}_{}={}", self.name, self.id, self.variant_id, self.line, self.col, if matches!(self.kind, Type::Array(_)) {
// If the function returns an array we have to store the intermediate result in a variable that is of type array
format!("({})", parsed_invocation_return)
} else {
parsed_invocation_return
})
);
self.get_variable(meta, invocation_instance, false)
}
}
impl DocumentationModule for FunctionInvocation {
fn document(&self, _meta: &ParserMetadata) -> String {
"".to_string()
}
}