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Functions
use crate::expression::parse_expression;
use crate::parser::domain::parse_domain;
use crate::util::named_children;
use crate::{EssenceParseError, field};
use conjure_cp_core::ast::ac_operators::ACOperatorKind;
use conjure_cp_core::ast::comprehension::ComprehensionBuilder;
use conjure_cp_core::ast::{DeclarationPtr, Expression, Metadata, Moo, Name, SymbolTablePtr};
use std::vec;
use tree_sitter::Node;
pub fn parse_comprehension(
node: &Node,
source_code: &str,
root: &Node,
symbols_ptr: Option<SymbolTablePtr>,
) -> Result<Expression, EssenceParseError> {
// Comprehensions require a symbol table passed in
let symbols_ptr = symbols_ptr.ok_or_else(|| {
EssenceParseError::syntax_error(
"Comprehensions require a symbol table".to_string(),
Some(node.range()),
)
})?;
let mut builder = ComprehensionBuilder::new(symbols_ptr.clone());
// We need to track the return expression node separately since it appears first in syntax
// but we need to parse generators first (to get variables in scope)
let mut return_expr_node: Option<Node> = None;
// set return expression node and parse generators/conditions
for child in named_children(node) {
match child.kind() {
"arithmetic_expr" | "bool_expr" | "comparison_expr" | "atom" => {
// Store the return expression node to parse later
return_expr_node = Some(child);
}
"generator" => {
// Parse the generator variable
let var_node = field!(child, "variable");
let var_name_str = &source_code[var_node.start_byte()..var_node.end_byte()];
let var_name = Name::user(var_name_str);
// Parse the domain
let domain_node = field!(child, "domain");
let var_domain = parse_domain(domain_node, source_code, Some(symbols_ptr.clone()))?;
// Add generator using the builder
let decl = DeclarationPtr::new_find(var_name, var_domain);
builder = builder.generator(decl);
"condition" => {
// Parse the condition expression
let expr_node = field!(child, "expression");
let generator_symboltable = builder.generator_symboltable();
let guard_expr =
parse_expression(expr_node, source_code, root, Some(generator_symboltable))?;
// Add the condition as a guard
builder = builder.guard(guard_expr);
_ => {
// Skip other nodes (like punctuation)
// parse the return expression
let return_expr_node = return_expr_node.ok_or_else(|| {
"Comprehension missing return expression".to_string(),
// Use the return expression symbol table which already has quantified variables (as Given) and parent as parent
let return_expr = parse_expression(
return_expr_node,
source_code,
root,
Some(builder.return_expr_symboltable()),
)?;
// Build the comprehension with the return expression and default ACOperatorKind::And
let comprehension = builder.with_return_value(return_expr, Some(ACOperatorKind::And));
Ok(Expression::Comprehension(
Metadata::new(),
Moo::new(comprehension),
))
/// Parse comprehension-style expressions
/// - `forAll vars : domain . expr` → `And(Comprehension(...))`
/// - `sum vars : domain . expr` → `Sum(Comprehension(...))`
pub fn parse_quantifier_or_aggregate_expr(
// Quantifier and aggregate expressions require a symbol table
"Quantifier and aggregate expressions require a symbol table".to_string(),
// Create the comprehension builder
// First pass: collect domain/collection, variables
let mut domain = None;
let mut collection_node = None;
let mut variables = vec![];
"identifier" => {
let var_name_str = &source_code[child.start_byte()..child.end_byte()];
variables.push(var_name);
"domain" => {
domain = Some(parse_domain(child, source_code, Some(symbols_ptr.clone()))?);
"set_literal" | "matrix" | "tuple" | "record" => {
// Store the collection node to parse later
collection_node = Some(child);
_ => continue,
// We need either a domain or a collection
if domain.is_none() && collection_node.is_none() {
return Err(EssenceParseError::syntax_error(
"Quantifier and aggregate expressions require a domain or collection".to_string(),
));
if variables.is_empty() {
"Quantifier and aggregate expressions require variables".to_string(),
// Get the operator type
let operator_node = field!(node, "operator");
let operator_str = &source_code[operator_node.start_byte()..operator_node.end_byte()];
let (ac_operator_kind, wrapper) = match operator_str {
"forAll" => (ACOperatorKind::And, "And"),
"exists" => (ACOperatorKind::Or, "Or"),
"sum" => (ACOperatorKind::Sum, "Sum"),
"min" => (ACOperatorKind::Sum, "Min"), // AC operator doesn't matter for non-boolean aggregates
"max" => (ACOperatorKind::Sum, "Max"),
format!("Unknown operator: {}", operator_str),
Some(operator_node.range()),
};
// Add variables as generators
if let Some(dom) = domain {
for var_name in variables {
let decl = DeclarationPtr::new_find(var_name, dom.clone());
} else if let Some(_coll_node) = collection_node {
// TODO: support collection domains
"Collection domains in quantifier and aggregate expressions not yet supported"
.to_string(),
// Parse the expression (after variables are in the symbol table)
let expression_node = node.child_by_field_name("expression").ok_or_else(|| {
"Quantifier or aggregate expression missing return expression".to_string(),
let expression = parse_expression(
expression_node,
// Build the comprehension
let comprehension = builder.with_return_value(expression, Some(ac_operator_kind));
let wrapped_comprehension = Expression::Comprehension(Metadata::new(), Moo::new(comprehension));
// Wrap in the appropriate expression type
match wrapper {
"And" => Ok(Expression::And(
Moo::new(wrapped_comprehension),
)),
"Or" => Ok(Expression::Or(
"Sum" => Ok(Expression::Sum(
"Min" => Ok(Expression::Min(
"Max" => Ok(Expression::Max(
_ => unreachable!(),