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/*
* Hurl (https://hurl.dev)
* Copyright (C) 2024 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 std::cmp;
use crate::ast::SourceInfo;
use crate::error;
use crate::error::DisplaySourceError;
use crate::reader::Pos;
use crate::text::{Style, StyledString};
/// Represents a parser error.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ParseError {
pub pos: Pos,
pub recoverable: bool,
pub kind: ParseErrorKind,
}
pub enum ParseErrorKind {
DuplicateSection,
EscapeChar,
Expecting { value: String },
FileContentType,
Filename,
GraphQlVariables,
HexDigit,
InvalidCookieAttribute,
InvalidDurationUnit(String),
InvalidOption(String),
Json(JsonErrorVariant),
JsonPathExpr,
Method { name: String },
Multiline,
MultilineAttribute(String),
OddNumberOfHexDigits,
Predicate,
PredicateValue,
RegexExpr { message: String },
RequestSection,
RequestSectionName { name: String },
ResponseSection,
ResponseSectionName { name: String },
Space,
Status,
TemplateVariable,
Unicode,
UrlIllegalCharacter(char),
UrlInvalidStart,
Variable(String),
Version,
XPathExpr,
Xml,
pub enum JsonErrorVariant {
TrailingComma,
ExpectingElement,
EmptyElement,
impl ParseError {
/// Creates a new error for the position `pos`, of type `inner`.
pub fn new(pos: Pos, recoverable: bool, kind: ParseErrorKind) -> ParseError {
ParseError {
pos,
recoverable,
kind,
impl DisplaySourceError for ParseError {
fn source_info(&self) -> SourceInfo {
SourceInfo {
start: self.pos,
end: self.pos,
fn description(&self) -> String {
match self.kind {
ParseErrorKind::DuplicateSection => "Parsing section".to_string(),
ParseErrorKind::EscapeChar => "Parsing escape character".to_string(),
ParseErrorKind::Expecting { .. } => "Parsing literal".to_string(),
ParseErrorKind::FileContentType => "Parsing file content type".to_string(),
ParseErrorKind::Filename => "Parsing filename".to_string(),
ParseErrorKind::GraphQlVariables => "Parsing GraphQL variables".to_string(),
ParseErrorKind::HexDigit => "Parsing hexadecimal number".to_string(),
ParseErrorKind::InvalidCookieAttribute => "Parsing cookie attribute".to_string(),
ParseErrorKind::InvalidOption(_) => "Parsing option".to_string(),
ParseErrorKind::InvalidDurationUnit(_) => "Parsing duration".to_string(),
ParseErrorKind::Json(_) => "Parsing JSON".to_string(),
ParseErrorKind::JsonPathExpr => "Parsing JSONPath expression".to_string(),
ParseErrorKind::Method { .. } => "Parsing method".to_string(),
ParseErrorKind::Multiline => "Parsing multiline".to_string(),
ParseErrorKind::MultilineAttribute(..) => "Parsing multiline".to_string(),
ParseErrorKind::OddNumberOfHexDigits => "Parsing hex bytearray".to_string(),
ParseErrorKind::Predicate => "Parsing predicate".to_string(),
ParseErrorKind::PredicateValue => "Parsing predicate value".to_string(),
ParseErrorKind::RegexExpr { .. } => "Parsing regex".to_string(),
ParseErrorKind::RequestSection => "Parsing section".to_string(),
ParseErrorKind::RequestSectionName { .. } => "Parsing request section name".to_string(),
ParseErrorKind::ResponseSection => "Parsing section".to_string(),
ParseErrorKind::ResponseSectionName { .. } => {
"Parsing response section name".to_string()
ParseErrorKind::Space => "Parsing space".to_string(),
ParseErrorKind::Status => "Parsing status code".to_string(),
ParseErrorKind::TemplateVariable => "Parsing template variable".to_string(),
ParseErrorKind::Unicode => "Parsing unicode literal".to_string(),
ParseErrorKind::UrlIllegalCharacter(_) => "Parsing URL".to_string(),
ParseErrorKind::UrlInvalidStart => "Parsing URL".to_string(),
ParseErrorKind::Variable(_) => "Parsing variable".to_string(),
ParseErrorKind::Version => "Parsing version".to_string(),
ParseErrorKind::XPathExpr => "Parsing XPath expression".to_string(),
ParseErrorKind::Xml => "Parsing XML".to_string(),
fn fixme(&self, content: &[&str]) -> StyledString {
let message = match &self.kind {
ParseErrorKind::DuplicateSection => "the section is already defined".to_string(),
ParseErrorKind::EscapeChar => "the escaping sequence is not valid".to_string(),
ParseErrorKind::Expecting { value } => format!("expecting '{value}'"),
ParseErrorKind::FileContentType => "expecting a content type".to_string(),
ParseErrorKind::Filename => "expecting a filename".to_string(),
ParseErrorKind::GraphQlVariables => {
"GraphQL variables is not a valid JSON object".to_string()
ParseErrorKind::HexDigit => "expecting a valid hexadecimal number".to_string(),
ParseErrorKind::InvalidCookieAttribute => {
"the cookie attribute is not valid".to_string()
ParseErrorKind::InvalidDurationUnit(name) => {
let valid_values = ["ms", "s"];
let default = format!("Valid values are {}", valid_values.join(", "));
let did_you_mean = did_you_mean(&valid_values, name.as_str(), &default);
format!("the duration unit is not valid. {did_you_mean}")
ParseErrorKind::InvalidOption(name) => {
let valid_values = [
"aws-sigv4",
"cacert",
"cert",
"compressed",
"connect-to",
"delay",
"insecure",
"http1.0",
"http1.1",
"http2",
"http3",
"ipv4",
"ipv6",
"key",
"location",
"max-redirs",
"output",
"path-as-is",
"proxy",
"resolve",
"retry",
"retry-interval",
"skip",
"unix-socket",
"variable",
"verbose",
"very-verbose",
];
format!("the option name is not valid. {did_you_mean}")
ParseErrorKind::Json(variant) => match variant {
JsonErrorVariant::TrailingComma => "trailing comma is not allowed".to_string(),
JsonErrorVariant::EmptyElement => {
"expecting an element; found empty element instead".to_string()
JsonErrorVariant::ExpectingElement => {
"expecting a boolean, number, string, array, object or null".to_string()
},
ParseErrorKind::JsonPathExpr => "expecting a JSONPath expression".to_string(),
ParseErrorKind::Method { name } => {
"GET", "HEAD", "POST", "PUT", "DELETE", "CONNECT", "OPTIONS", "TRACE", "PATCH",
format!("the HTTP method <{name}> is not valid. {did_you_mean}")
ParseErrorKind::Multiline => "the multiline is not valid".to_string(),
ParseErrorKind::MultilineAttribute(name) => format!("Invalid attribute {name}"),
ParseErrorKind::OddNumberOfHexDigits => {
"expecting an even number of hex digits".to_string()
ParseErrorKind::Predicate => "expecting a predicate".to_string(),
ParseErrorKind::PredicateValue => "invalid predicate value".to_string(),
ParseErrorKind::RegexExpr { message } => format!("invalid Regex expression: {message}"),
ParseErrorKind::RequestSection => {
"this is not a valid section for a request".to_string()
ParseErrorKind::RequestSectionName { name } => {
"QueryStringParams",
"FormParams",
"MultipartFormData",
"Cookies",
"Options",
format!("the section is not valid. {did_you_mean}")
ParseErrorKind::ResponseSection => {
"this is not a valid section for a response".to_string()
ParseErrorKind::ResponseSectionName { name } => {
let valid_values = ["Captures", "Asserts"];
let default = "Valid values are Captures or Asserts";
let did_your_mean = did_you_mean(&valid_values, name.as_str(), default);
format!("the section is not valid. {did_your_mean}")
ParseErrorKind::Space => "expecting a space".to_string(),
ParseErrorKind::Status => "HTTP status code is not valid".to_string(),
ParseErrorKind::TemplateVariable => "expecting a variable".to_string(),
ParseErrorKind::Unicode => "Invalid unicode literal".to_string(),
ParseErrorKind::UrlIllegalCharacter(c) => format!("illegal character <{c}>"),
ParseErrorKind::UrlInvalidStart => "expecting http://, https:// or {{".to_string(),
ParseErrorKind::Variable(message) => message.clone(),
ParseErrorKind::Version => {
"HTTP version must be HTTP, HTTP/1.0, HTTP/1.1 or HTTP/2".to_string()
ParseErrorKind::XPathExpr => "expecting a XPath expression".to_string(),
ParseErrorKind::Xml => "invalid XML".to_string(),
};
let message = error::add_carets(&message, self.source_info(), content);
let mut s = StyledString::new();
s.push_with(&message, Style::new().red().bold());
s
impl crate::combinator::ParseError for ParseError {
fn is_recoverable(&self) -> bool {
self.recoverable
fn to_recoverable(self) -> Self {
recoverable: true,
..self
fn to_non_recoverable(self) -> Self {
recoverable: false,
fn did_you_mean(valid_values: &[&str], actual: &str, default: &str) -> String {
if let Some(suggest) = suggestion(valid_values, actual) {
format!("Did you mean {suggest}?")
} else {
default.to_string()
fn suggestion(valid_values: &[&str], actual: &str) -> Option<String> {
for value in valid_values {
if levenshtein_distance(
value.to_lowercase().as_str(),
actual.to_lowercase().as_str(),
) < 2
{
return Some(value.to_string());
None
// From https://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#Rust
fn levenshtein_distance(s1: &str, s2: &str) -> usize {
let v1: Vec<char> = s1.chars().collect();
let v2: Vec<char> = s2.chars().collect();
fn min3<T: Ord>(v1: T, v2: T, v3: T) -> T {
cmp::min(v1, cmp::min(v2, v3))
fn delta(x: char, y: char) -> usize {
usize::from(x != y)
let mut column: Vec<usize> = (0..=v1.len()).collect();
for x in 1..=v2.len() {
column[0] = x;
let mut lastdiag = x - 1;
for y in 1..=v1.len() {
let olddiag = column[y];
column[y] = min3(
column[y] + 1,
column[y - 1] + 1,
lastdiag + delta(v1[y - 1], v2[x - 1]),
);
lastdiag = olddiag;
column[v1.len()]
#[cfg(test)]
mod tests {
use super::*;
use crate::error::OutputFormat;
#[test]
fn test_levenshtein() {
assert_eq!(levenshtein_distance("kitten", "sitting"), 3);
assert_eq!(levenshtein_distance("Saturday", "Sunday"), 3);
fn test_suggestion() {
assert_eq!(
suggestion(&valid_values, "Asserts"),
Some("Asserts".to_string())
suggestion(&valid_values, "Assert"),
suggestion(&valid_values, "assert"),
assert_eq!(suggestion(&valid_values, "asser"), None);
fn test_parsing_error() {
let content = "GET abc";
let filename = "test.hurl";
let error = ParseError {
pos: Pos::new(1, 5),
kind: ParseErrorKind::UrlInvalidStart,
error.to_string(filename, content, None, OutputFormat::Terminal(false)),
r#"Parsing URL
--> test.hurl:1:5
|
1 | GET abc
| ^ expecting http://, https:// or {{
|"#