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//! Comprehensive tests for the `parser_arith` module.
//!
//! Covers tokenization, precedence-climbing parsing, operator lowering,
//! edge cases, and error handling for bash arithmetic expressions.
#![allow(clippy::unwrap_used)]
#![allow(clippy::expect_used)]
use super::ast::ArithExpr;
use super::parser::BashParser;
use super::parser_arith::ArithToken;
// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------
/// Parse an arithmetic expression string into an `ArithExpr`.
fn parse_arith(input: &str) -> ArithExpr {
let mut parser = BashParser::new("echo x").unwrap();
parser.parse_arithmetic_expr(input).unwrap()
}
/// Tokenize an arithmetic expression string.
fn tokenize(input: &str) -> Vec<ArithToken> {
let parser = BashParser::new("echo x").unwrap();
parser.tokenize_arithmetic(input).unwrap()
}
/// Parse expecting an error.
fn parse_arith_err(input: &str) -> super::parser::ParseError {
let mut parser = BashParser::new("echo x").unwrap();
parser.parse_arithmetic_expr(input).unwrap_err()
}
// ===========================================================================
// Basic arithmetic: number and variable literals
// ===========================================================================
#[test]
fn test_arith_number() {
assert_eq!(parse_arith("42"), ArithExpr::Number(42));
}
#[test]
fn test_arith_variable() {
assert_eq!(parse_arith("x"), ArithExpr::Variable("x".to_string()),);
}
#[test]
fn test_arith_addition() {
assert_eq!(
parse_arith("1+2"),
ArithExpr::Add(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Number(2)),
),
);
}
#[test]
fn test_arith_subtraction() {
assert_eq!(
parse_arith("5-3"),
ArithExpr::Sub(
Box::new(ArithExpr::Number(5)),
Box::new(ArithExpr::Number(3)),
),
);
}
#[test]
fn test_arith_multiplication() {
assert_eq!(
parse_arith("3*4"),
ArithExpr::Mul(
Box::new(ArithExpr::Number(3)),
Box::new(ArithExpr::Number(4)),
),
);
}
#[test]
fn test_arith_division() {
assert_eq!(
parse_arith("10/2"),
ArithExpr::Div(
Box::new(ArithExpr::Number(10)),
Box::new(ArithExpr::Number(2)),
),
);
}
#[test]
fn test_arith_modulo() {
assert_eq!(
parse_arith("7%3"),
ArithExpr::Mod(
Box::new(ArithExpr::Number(7)),
Box::new(ArithExpr::Number(3)),
),
);
}
// ===========================================================================
// Operator precedence
// ===========================================================================
#[test]
fn test_arith_precedence_mul_over_add() {
// 1+2*3 => Add(1, Mul(2, 3)) -- multiplication binds tighter
assert_eq!(
parse_arith("1+2*3"),
ArithExpr::Add(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Mul(
Box::new(ArithExpr::Number(2)),
Box::new(ArithExpr::Number(3)),
)),
),
);
}
#[test]
fn test_arith_precedence_parens() {
// (1+2)*3 => Mul(Add(1, 2), 3) -- parentheses override
assert_eq!(
parse_arith("(1+2)*3"),
ArithExpr::Mul(
Box::new(ArithExpr::Add(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Number(2)),
)),
Box::new(ArithExpr::Number(3)),
),
);
}
#[test]
fn test_arith_left_assoc() {
// 1-2-3 => Sub(Sub(1, 2), 3) -- left-to-right associativity
assert_eq!(
parse_arith("1-2-3"),
ArithExpr::Sub(
Box::new(ArithExpr::Sub(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Number(2)),
)),
Box::new(ArithExpr::Number(3)),
),
);
}
// ===========================================================================
// Comparison operators (all lowered to Sub in the AST)
// ===========================================================================
#[test]
fn test_arith_lt() {
// x < 10 => Sub(Variable("x"), Number(10))
assert_eq!(
parse_arith("x<10"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(10)),
),
);
}
#[test]
fn test_arith_le() {
assert_eq!(
parse_arith("x<=10"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(10)),
),
);
}
#[test]
fn test_arith_gt() {
assert_eq!(
parse_arith("x>0"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(0)),
),
);
}
#[test]
fn test_arith_ge() {
assert_eq!(
parse_arith("x>=5"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(5)),
),
);
}
#[test]
fn test_arith_eq() {
// x == 0 => Sub(Variable("x"), Number(0))
assert_eq!(
parse_arith("x==0"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(0)),
),
);
}
#[test]
fn test_arith_ne() {
assert_eq!(
parse_arith("x!=0"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(0)),
),
);
}
// ===========================================================================
// Bitwise operators
// ===========================================================================
#[test]
fn test_arith_bitand() {
// x & 0xFF => Mul(Variable("x"), Number(255)) -- bitwise AND lowered to Mul
// 0xFF is hex 255
assert_eq!(
parse_arith("x&0xFF"),
ArithExpr::Mul(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(255)),
),
);
}
#[test]
fn test_arith_bitor() {
// x | 1 => Add(Variable("x"), Number(1)) -- bitwise OR lowered to Add
assert_eq!(
parse_arith("x|1"),
ArithExpr::Add(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(1)),
),
);
}
#[test]
fn test_arith_bitxor() {
// x ^ y => Sub(Variable("x"), Variable("y")) -- bitwise XOR lowered to Sub
assert_eq!(
parse_arith("x^y"),
ArithExpr::Sub(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Variable("y".to_string())),
),
);
}
#[test]
fn test_arith_shl() {
// 1 << 4 => Mul(Number(1), Number(4)) -- shift left lowered to Mul
assert_eq!(
parse_arith("1<<4"),
ArithExpr::Mul(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Number(4)),
),
);
}
#[test]
fn test_arith_shr() {
// x >> 1 => Div(Variable("x"), Number(1)) -- shift right lowered to Div
assert_eq!(
parse_arith("x>>1"),
ArithExpr::Div(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(1)),
),
);
}
// ===========================================================================
// Logical operators
// ===========================================================================
#[test]
fn test_arith_logical_and() {
// x && y => Mul(Variable("x"), Variable("y")) -- logical AND lowered to Mul
assert_eq!(
parse_arith("x&&y"),
ArithExpr::Mul(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Variable("y".to_string())),
),
);
}
#[test]
fn test_arith_logical_or() {
// x || y => Add(Variable("x"), Variable("y")) -- logical OR lowered to Add
assert_eq!(
parse_arith("x||y"),
ArithExpr::Add(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Variable("y".to_string())),
),
);
}
#[test]
fn test_arith_logical_not() {
// !x => Sub(Number(-1), Variable("x")) -- logical NOT lowered like bitwise NOT
assert_eq!(
parse_arith("!x"),
ArithExpr::Sub(
Box::new(ArithExpr::Number(-1)),
Box::new(ArithExpr::Variable("x".to_string())),
),
);
}
// ===========================================================================
// Ternary operator
// ===========================================================================
#[test]
fn test_arith_ternary() {
// x ? 1 : 0 => Add(Mul(x, 1), Mul(Sub(1, x), 0))
assert_eq!(
parse_arith("x?1:0"),
ArithExpr::Add(
Box::new(ArithExpr::Mul(
Box::new(ArithExpr::Variable("x".to_string())),
Box::new(ArithExpr::Number(1)),
)),
Box::new(ArithExpr::Mul(
Box::new(ArithExpr::Sub(
Box::new(ArithExpr::Number(1)),
Box::new(ArithExpr::Variable("x".to_string())),
)),
Box::new(ArithExpr::Number(0)),
)),
),
);
}
// ===========================================================================
// Exponentiation
// ===========================================================================
#[test]
include!("parser_arith_tests_tests_arith.rs");