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/*
* Hurl (https://hurl.dev)
* Copyright (C) 2026 Orange
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use crate::ast::{Expr, ExprKind, SourceInfo, Variable};
use crate::reader::Reader;
use super::error::{ParseError, ParseErrorKind};
use super::{ParseResult, function};
/// Parse an expression
///
/// Currently, an expression can only be found inside a placeholder
pub fn parse(reader: &mut Reader) -> ParseResult<Expr> {
let start = reader.cursor().pos;
let save_state = reader.cursor();
let kind = match function::parse(reader) {
Ok(function) => ExprKind::Function(function),
Err(e) => {
if e.recoverable {
reader.seek(save_state);
let variable = variable_name(reader)?;
ExprKind::Variable(variable)
} else {
return Err(e);
}
};
let end = reader.cursor().pos;
let source_info = SourceInfo::new(start, end);
Ok(Expr { source_info, kind })
fn variable_name(reader: &mut Reader) -> ParseResult<Variable> {
let start = reader.cursor();
let name = reader.read_while(|c| c.is_alphanumeric() || c == '_' || c == '-');
if name.is_empty() {
return Err(ParseError::new(
start.pos,
false,
ParseErrorKind::TemplateVariable,
));
Ok(Variable {
name,
source_info: SourceInfo::new(start.pos, reader.cursor().pos),
})
#[cfg(test)]
mod tests {
use super::*;
use crate::reader::Pos;
#[test]
fn test_variable() {
let mut reader = Reader::new("name");
assert_eq!(
variable_name(&mut reader).unwrap(),
Variable {
name: String::from("name"),
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 5)),
);
let mut reader = Reader::new("my-id");
name: String::from("my-id"),
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 6)),