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pub mod ast;
mod parser {
include!(concat!(env!("OUT_DIR"), "/parser.rs"));
}
pub use lalrpop_util::ParseError;
pub use crate::parser::Token;
pub struct Parser {}
impl Parser {
pub fn parse(input: &str) -> Result<ast::Expression, ParseError<usize, Token, &str>> {
Ok(*parser::ExpressionParser::new().parse(input)?)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ast::{Expression, OpCode};
#[test]
fn literal() {
assert_eq!(Parser::parse("1"), Ok(Expression::Number(1.0)));
}
#[test]
fn binary_expression() {
assert_eq!(
Parser::parse("1+2"),
Ok(Expression::BinaryOperation {
operation: OpCode::Add,
left: Box::new(Expression::Number(1.0)),
right: Box::new(Expression::Number(2.0)),
}),
);
}
#[test]
fn binary_expression_whitespace() {
assert_eq!(Parser::parse("1 + 2 "), Parser::parse("1+2"),);
}
#[test]
fn transform_simple_no_args() {
let exp = "'T_T'|lower";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::Transform {
name: "lower".to_string(),
subject: Box::new(Expression::String("T_T".to_string())),
args: None
}
);
}
#[test]
fn transform_multiple_args() {
let exp = "'John Doe'|split(' ')";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::Transform {
name: "split".to_string(),
subject: Box::new(Expression::String("John Doe".to_string())),
args: Some(vec![Box::new(Expression::String(" ".to_string()))])
}
);
}
#[test]
fn trasform_way_too_many_args() {
let exp = "123456|math(12, 35, 100, 31, 90)";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::Transform {
name: "math".to_string(),
subject: Box::new(Expression::Number(123_456f64)),
args: Some(vec![
Box::new(Expression::Number(12f64)),
Box::new(Expression::Number(35f64)),
Box::new(Expression::Number(100f64)),
Box::new(Expression::Number(31f64)),
Box::new(Expression::Number(90f64)),
])
}
);
}
#[test]
fn test_index_op_ident() {
let exp = "foo[0]";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::IndexOperation {
subject: Box::new(Expression::Identifier("foo".to_string())),
index: Box::new(Expression::Number(0f64))
}
);
}
#[test]
fn test_index_op_array_literal() {
let exp = "[1, 2, 3][0]";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::IndexOperation {
subject: Box::new(Expression::Array(vec![
Box::new(Expression::Number(1f64)),
Box::new(Expression::Number(2f64)),
Box::new(Expression::Number(3f64)),
])),
index: Box::new(Expression::Number(0f64))
}
);
}
#[test]
fn test_dot_op_ident() {
let exp = "foo.bar";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::DotOperation {
subject: Box::new(Expression::Identifier("foo".to_string())),
ident: "bar".to_string()
}
);
}
#[test]
fn test_dot_op_object_literal() {
let exp = "{'foo': 1}.foo";
let parsed = Parser::parse(exp).unwrap();
assert_eq!(
parsed,
Expression::DotOperation {
subject: Box::new(Expression::Object(vec![(
"foo".to_string(),
Box::new(Expression::Number(1f64))
)])),
ident: "foo".to_string()
}
);
}
}