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// SPDX-License-Identifier: Apache-2.0
use crate::NmstateError;
const NEXT_TOKEN_START_CHARS: [char; 6] = [' ', '=', '!', '|', '"', ':'];
#[derive(Clone, Eq, PartialEq, Debug)]
pub(crate) enum NetworkCaptureToken {
Path(Vec<String>, usize), // Example: routes.running.destination
Value(String, usize), // Example: 13 or "Abc"
Pipe(usize), // |
Replace(usize), // :=
Equal(usize), // ==
Null(usize), // Unquoted null or NULL or Null
}
impl Default for NetworkCaptureToken {
fn default() -> Self {
Self::Value(String::new(), 0)
}
}
impl NetworkCaptureToken {
pub(crate) fn pos(&self) -> usize {
match self {
Self::Path(_, p)
| Self::Value(_, p)
| Self::Pipe(p)
| Self::Replace(p)
| Self::Equal(p)
| Self::Null(p) => *p,
}
}
}
pub(crate) fn parse_str_to_capture_tokens(
line: &str,
) -> Result<Vec<NetworkCaptureToken>, NmstateError> {
let mut ret: Vec<NetworkCaptureToken> = Vec::new();
let line_chars: Vec<char> = line.chars().collect();
let mut line_iter = line.char_indices().peekable();
while let Some((pos, c)) = line_iter.next() {
log::debug!(
"Token processing {:?}, got {:?}, cur: {}",
String::from_iter(&line_chars[pos..]),
ret,
c
);
match c {
'=' => {
if let Some((_, c)) = line_iter.next() {
if c == '=' {
if ret.as_slice().iter().any(|c| {
matches!(c, &NetworkCaptureToken::Equal(_))
}) {
return Err(NmstateError::new_policy_error(
"Nmpolicy does not allows two equal action"
.to_string(),
line,
pos,
));
}
ret.push(NetworkCaptureToken::Equal(pos));
} else {
return Err(NmstateError::new_policy_error(
"Invalid equal action string after =, \
expecting another '='"
.to_string(),
line,
pos + 1,
));
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid equal action string after =, \
expecting another '=', but got nothing"
.to_string(),
line,
pos,
));
}
}
'|' => {
if ret
.as_slice()
.iter()
.any(|t| matches!(t, &NetworkCaptureToken::Pipe(_)))
{
return Err(NmstateError::new_policy_error(
"Nmpolicy does not allows two pipe action".to_string(),
line,
pos,
));
} else {
ret.push(NetworkCaptureToken::Pipe(pos));
}
}
':' => {
if let Some((_, c)) = line_iter.next() {
if c == '=' {
if ret.as_slice().iter().any(|t| {
matches!(t, &NetworkCaptureToken::Replace(_))
}) {
return Err(NmstateError::new_policy_error(
"Nmpolicy does not allows two replace action"
.to_string(),
line,
pos,
));
} else {
ret.push(NetworkCaptureToken::Replace(pos));
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid replace action string after =, \
expecting another '='"
.to_string(),
line,
pos + 1,
));
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid replace action string after =, \
expecting another '=', but got nothing"
.to_string(),
line,
pos,
));
}
}
'"' => {
// Continue till next double quote
if pos + 1 >= line_chars.len()
|| !&line_chars[pos + 1..].contains(&'"')
{
return Err(NmstateError::new_policy_error(
"No ending double quote".to_string(),
line,
pos,
));
}
let mut quoted_string_chars = Vec::new();
for (_, c) in line_iter.by_ref() {
if c != '"' {
quoted_string_chars.push(c);
} else {
break;
}
}
if !quoted_string_chars.is_empty() {
ret.push(NetworkCaptureToken::Value(
String::from_iter(quoted_string_chars.as_slice()),
pos + 1,
));
}
}
_ => {
if c.is_whitespace() {
continue;
}
let block = consume_till_next_token(c, &mut line_iter);
if block.contains('.') {
ret.push(NetworkCaptureToken::Path(
block.split('.').map(|c| c.to_string()).collect(),
pos,
));
} else if !block.is_empty() {
if block.to_lowercase() == "null" {
ret.push(NetworkCaptureToken::Null(pos));
} else {
ret.push(NetworkCaptureToken::Value(block, pos));
}
}
}
}
}
if let Some(pos) = ret
.as_slice()
.iter()
.position(|c| matches!(c, &NetworkCaptureToken::Pipe(_)))
{
if ret.len() == pos + 1 {
return Err(NmstateError::new_policy_error(
"Invalid pipe action: no property path defined".to_string(),
line,
ret[pos].pos(),
));
}
if !matches!(&ret[pos + 1], &NetworkCaptureToken::Path(_, _)) {
return Err(NmstateError::new_policy_error(
"Invalid pipe action: only property path allowed after pipe"
.to_string(),
line,
ret[pos + 1].pos(),
));
}
}
Ok(ret)
}
fn consume_till_next_token(
leading_char: char,
line_iter: &mut std::iter::Peekable<std::str::CharIndices>,
) -> String {
let mut block = vec![leading_char];
while let Some((_, c)) = line_iter.peek() {
if NEXT_TOKEN_START_CHARS.contains(c) {
break;
} else if let Some((_, c)) = line_iter.next() {
block.push(c);
} else {
break;
}
}
String::from_iter(block.as_slice()).trim().to_string()
}
#[derive(Clone, Eq, PartialEq, Debug)]
pub(crate) enum NetworkTemplateToken {
Value(String, usize),
ReferenceStart(usize), // {{
Path(Vec<String>, usize), // Example: routes.running.destination
ReferenceEnd(usize), // }}
}
impl NetworkTemplateToken {
pub(crate) fn pos(&self) -> usize {
match self {
Self::Path(_, p)
| Self::Value(_, p)
| Self::ReferenceStart(p)
| Self::ReferenceEnd(p) => *p,
}
}
}
pub(crate) fn parse_str_to_template_tokens(
line: &str,
) -> Result<Vec<NetworkTemplateToken>, NmstateError> {
let mut ret: Vec<NetworkTemplateToken> = Vec::new();
let line_chars: Vec<char> = line.chars().collect();
let mut line_iter = line.char_indices().peekable();
while let Some((pos, c)) = line_iter.next() {
log::debug!(
"Token processing {:?}, got {:?}, cur: {}",
String::from_iter(&line_chars[pos..]),
ret,
c
);
match c {
'{' => {
if let Some((_, c)) = line_iter.next() {
if c == '{' {
if ret.as_slice().iter().any(|c| {
matches!(
c,
&NetworkTemplateToken::ReferenceStart(_)
)
}) {
return Err(NmstateError::new_policy_error(
"Nmpolicy does not allow multiple references \
{{}}"
.to_string(),
line,
pos,
));
}
ret.push(NetworkTemplateToken::ReferenceStart(pos));
// Normally we have a white space after '}', let's
// remove it and move on the pos
while let Some((_, c)) = line_iter.peek() {
if c.is_whitespace() {
line_iter.next();
} else {
break;
}
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid reference action string after {, \
expecting another '{'"
.to_string(),
line,
pos,
));
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid reference action string after =, \
expecting another '{', but got nothing"
.to_string(),
line,
pos,
));
}
}
'}' => {
if let Some((_, c)) = line_iter.next() {
if c == '}' {
if ret.as_slice().iter().any(|c| {
matches!(c, &NetworkTemplateToken::ReferenceEnd(_))
}) {
return Err(NmstateError::new_policy_error(
"Nmpolicy does not allow multiple references \
{{}}"
.to_string(),
line,
pos,
));
}
ret.push(NetworkTemplateToken::ReferenceEnd(pos));
} else {
return Err(NmstateError::new_policy_error(
"Invalid reference action string after }, \
expecting another '}'"
.to_string(),
line,
pos,
));
}
} else {
return Err(NmstateError::new_policy_error(
"Invalid reference action string after }, \
expecting another '}', but got nothing"
.to_string(),
line,
pos,
));
}
}
_ => {
let mut chars = vec![c];
while let Some((_, c)) = line_iter.peek() {
if ['{', '}'].contains(c) {
break;
} else if let Some((_, c)) = line_iter.next() {
if c.is_whitespace() {
break;
}
chars.push(c);
} else {
break;
}
}
// position should be first char after trimmed
let subline =
String::from_iter(chars.as_slice()).trim().to_string();
if subline.is_empty() {
continue;
}
if subline.contains('.') && !subline.starts_with('.') {
ret.push(NetworkTemplateToken::Path(
subline.split('.').map(|c| c.to_string()).collect(),
pos,
));
} else {
ret.push(NetworkTemplateToken::Value(subline, pos));
}
}
}
}
// The reference start and end should be paired.
if let Some(token_start) = ret
.as_slice()
.iter()
.find(|c| matches!(c, &NetworkTemplateToken::ReferenceStart(_)))
{
if !ret
.as_slice()
.iter()
.any(|c| matches!(c, &NetworkTemplateToken::ReferenceEnd(_)))
{
return Err(NmstateError::new_policy_error(
"No reference end }} found".to_string(),
line,
token_start.pos(),
));
}
}
if let Some(token_end) = ret
.as_slice()
.iter()
.find(|c| matches!(c, &NetworkTemplateToken::ReferenceEnd(_)))
{
if !ret
.as_slice()
.iter()
.any(|c| matches!(c, &NetworkTemplateToken::ReferenceStart(_)))
{
return Err(NmstateError::new_policy_error(
"No reference start {{ found".to_string(),
line,
token_end.pos(),
));
}
}
if let (Some(token_start_pos), Some(token_end_pos)) = (
ret.as_slice().iter().position(|t| {
matches!(t, &NetworkTemplateToken::ReferenceStart(_))
}),
ret.as_slice()
.iter()
.position(|t| matches!(t, &NetworkTemplateToken::ReferenceEnd(_))),
) {
if token_start_pos >= token_end_pos {
return Err(NmstateError::new_policy_error(
"The reference start {{ can not be placed before \
reference end }}"
.to_string(),
line,
ret[token_end_pos].pos(),
));
}
if token_start_pos + 1 >= token_end_pos {
return Err(NmstateError::new_policy_error(
"No property path between reference start {{ and \
reference end }}"
.to_string(),
line,
ret[token_end_pos].pos() - 1,
));
}
if token_start_pos + 2 != token_end_pos {
return Err(NmstateError::new_policy_error(
"Only allows single property path between reference \
start {{ and reference end }}"
.to_string(),
line,
ret[token_start_pos + 2].pos(),
));
}
}
Ok(ret)
}