Module string 

String literal parser for PromQL.

PromQL supports three string literal formats:

• Double-quoted: "hello \"world\""
• Single-quoted: 'hello \'world\''
• Raw/backtick: `no escapes here`

Escape Sequences

Double and single-quoted strings support these escape sequences:

Escape	Description
\a	Bell
\b	Backspace
\f	Form feed
\n	Newline
\r	Carriage return
\t	Tab
\v	Vertical tab
\\	Backslash
\"	Double quote
\'	Single quote
\xNN	Hex (2 digits)
\NNN	Octal (3 digits)
\uNNNN	Unicode (4 hex)
\UNNNNNNNN	Unicode (8 hex)

Raw strings (backtick) have no escape processing.

Examples

use rusty_promql_parser::lexer::string::string_literal;

// Double-quoted
let (_, s) = string_literal(r#""hello""#).unwrap();
assert_eq!(s, "hello");

// Single-quoted with escape
let (_, s) = string_literal(r"'line\nbreak'").unwrap();
assert_eq!(s, "line\nbreak");

// Raw string (no escapes)
let (_, s) = string_literal(r"`\n is literal`").unwrap();
assert_eq!(s, r"\n is literal");

Functions

double_quoted_string

Parse a double-quoted string: “hello "world"”

raw_string

Parse a raw/backtick string: no escapes In raw strings, backslashes are literal - no escape processing.

single_quoted_string

Parse a single-quoted string: ‘hello 'world'’

string_literal

Parse a PromQL string literal and return the unescaped string value.