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/*
* Hurl (https://hurl.dev)
* Copyright (C) 2025 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::{Placeholder, SourceInfo, TemplateElement};
use crate::parser::primitives::zero_or_more_spaces;
use crate::parser::{error, expr, ParseResult};
use crate::reader::{Pos, Reader};
use crate::typing::SourceString;
pub struct EncodedString {
pub source_info: SourceInfo,
pub chars: Vec<(char, String, Pos)>,
}
pub fn templatize(encoded_string: EncodedString) -> ParseResult<Vec<TemplateElement>> {
enum State {
String,
Template,
FirstOpenBracket,
FirstCloseBracket,
let mut elements = vec![];
let mut value = String::new();
let mut source = SourceString::new();
let mut state = State::String;
let mut expression_start = None;
for (c, s, pos) in encoded_string.chars {
match state {
State::String => {
if s.as_str() == "{" {
state = State::FirstOpenBracket;
} else {
value.push(c);
source.push_str(&s);
State::FirstOpenBracket => {
if !value.is_empty() {
elements.push(TemplateElement::String { value, source });
value = String::new();
source = SourceString::new();
state = State::Template;
value.push('{');
source.push('{');
state = State::String;
State::Template => {
if expression_start.is_none() {
expression_start = Some(pos);
if s.as_str() == "}" {
state = State::FirstCloseBracket;
State::FirstCloseBracket => {
let mut reader = Reader::with_pos(source.as_str(), expression_start.unwrap());
let space0 = zero_or_more_spaces(&mut reader)?;
let expr = expr::parse(&mut reader)?;
let space1 = zero_or_more_spaces(&mut reader)?;
let placeholder = Placeholder {
space0,
expr,
space1,
};
elements.push(TemplateElement::Placeholder(placeholder));
expression_start = None;
value.push('}');
source.push('}');
State::String => {}
State::Template | State::FirstCloseBracket => {
let kind = error::ParseErrorKind::Expecting {
value: "}}".to_string(),
return Err(error::ParseError::new(
encoded_string.source_info.end,
false,
kind,
));
Ok(elements)
#[cfg(test)]
mod tests {
use super::*;
use crate::ast::{Expr, ExprKind, Placeholder, Variable, Whitespace};
use crate::typing::ToSource;
#[test]
fn test_templatize_empty_string() {
let encoded_string = EncodedString {
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 1)),
chars: vec![],
assert_eq!(templatize(encoded_string).unwrap(), vec![]);
fn test_templatize_hello_world() {
// Hi\u0020{{name}}!
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 18)),
chars: vec![
('H', "H".to_string(), Pos { line: 1, column: 1 }),
('i', "i".to_string(), Pos { line: 1, column: 2 }),
(' ', "\\u0020".to_string(), Pos { line: 1, column: 3 }),
('{', "{".to_string(), Pos { line: 1, column: 9 }),
(
'{',
"{".to_string(),
Pos {
line: 1,
column: 10,
},
),
'n',
"n".to_string(),
column: 11,
'a',
"a".to_string(),
column: 12,
'm',
"m".to_string(),
column: 13,
'e',
"e".to_string(),
column: 14,
'}',
"}".to_string(),
column: 15,
column: 16,
'!',
"!".to_string(),
column: 17,
],
assert_eq!(
templatize(encoded_string).unwrap(),
vec![
TemplateElement::String {
value: "Hi ".to_string(),
source: "Hi\\u0020".to_source(),
TemplateElement::Placeholder(Placeholder {
space0: Whitespace {
value: String::new(),
source_info: SourceInfo::new(Pos::new(1, 11), Pos::new(1, 11)),
expr: Expr {
kind: ExprKind::Variable(Variable {
name: "name".to_string(),
source_info: SourceInfo::new(Pos::new(1, 11), Pos::new(1, 15)),
}),
space1: Whitespace {
source_info: SourceInfo::new(Pos::new(1, 15), Pos::new(1, 15)),
value: "!".to_string(),
source: "!".to_source(),
]
);
fn test_templatize_expression_only() {
// {{x}}!
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 7)),
('{', "{".to_string(), Pos { line: 1, column: 1 }),
('{', "{".to_string(), Pos { line: 1, column: 2 }),
('x', "x".to_string(), Pos { line: 1, column: 3 }),
('}', "}".to_string(), Pos { line: 1, column: 4 }),
vec![TemplateElement::Placeholder(Placeholder {
source_info: SourceInfo::new(Pos::new(1, 3), Pos::new(1, 3)),
name: "x".to_string(),
source_info: SourceInfo::new(Pos::new(1, 3), Pos::new(1, 4)),
source_info: SourceInfo::new(Pos::new(1, 3), Pos::new(1, 4))
source_info: SourceInfo::new(Pos::new(1, 4), Pos::new(1, 4)),
}),]
fn test_templatize_error() {
// missing closing
// {{x
source_info: SourceInfo::new(Pos::new(1, 1), Pos::new(1, 4)),
let error = templatize(encoded_string).err().unwrap();
assert_eq!(error.pos, Pos { line: 1, column: 4 });
error.kind,
error::ParseErrorKind::Expecting {
value: "}}".to_string()
assert!(!error.recoverable);
fn test_escape_bracket() {
// \{\{
// This is a valid string "{{"
('{', "\\{".to_string(), Pos::new(1, 1)),
('{', "\\{".to_string(), Pos::new(1, 2)),
vec![TemplateElement::String {
value: "{{".to_string(),
source: "\\{\\{".to_source(),
},]