228 lines
7.5 KiB
Rust
228 lines
7.5 KiB
Rust
use crate::{
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compilation::context::CompilationContext,
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error::{error, no_error, ErrorIterator, ValidationError},
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keywords::CompilationResult,
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paths::InstancePath,
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primitive_type::PrimitiveType,
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validator::Validate,
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};
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use once_cell::sync::Lazy;
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use serde_json::{Map, Value};
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use crate::paths::JSONPointer;
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use std::ops::Index;
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// Use regex::Regex here to take advantage of replace_all method not available in fancy_regex::Regex
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static CONTROL_GROUPS_RE: Lazy<regex::Regex> =
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Lazy::new(|| regex::Regex::new(r"\\c[A-Za-z]").expect("Is a valid regex"));
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pub(crate) struct PatternValidator {
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original: String,
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pattern: fancy_regex::Regex,
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schema_path: JSONPointer,
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}
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impl PatternValidator {
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#[inline]
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pub(crate) fn compile<'a>(
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pattern: &'a Value,
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context: &CompilationContext,
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) -> CompilationResult<'a> {
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match pattern {
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Value::String(item) => {
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let pattern = match convert_regex(item) {
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Ok(r) => r,
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Err(_) => {
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return Err(ValidationError::format(
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JSONPointer::default(),
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context.clone().into_pointer(),
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pattern,
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"regex",
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))
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}
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};
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Ok(Box::new(PatternValidator {
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original: item.clone(),
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pattern,
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schema_path: context.as_pointer_with("pattern"),
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}))
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}
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_ => Err(ValidationError::single_type_error(
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JSONPointer::default(),
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context.clone().into_pointer(),
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pattern,
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PrimitiveType::String,
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)),
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}
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}
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}
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impl Validate for PatternValidator {
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fn validate<'instance>(
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&self,
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instance: &'instance Value,
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instance_path: &InstancePath,
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) -> ErrorIterator<'instance> {
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if let Value::String(item) = instance {
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match self.pattern.is_match(item) {
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Ok(is_match) => {
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if !is_match {
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return error(ValidationError::pattern(
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self.schema_path.clone(),
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instance_path.into(),
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instance,
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self.original.clone(),
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));
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}
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}
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Err(e) => {
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return error(ValidationError::backtrack_limit(
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self.schema_path.clone(),
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instance_path.into(),
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instance,
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e,
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));
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}
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}
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}
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no_error()
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}
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fn is_valid(&self, instance: &Value) -> bool {
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if let Value::String(item) = instance {
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return self.pattern.is_match(item).unwrap_or(false);
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}
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true
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}
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}
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impl core::fmt::Display for PatternValidator {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "pattern: {}", self.pattern)
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}
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}
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// ECMA 262 has differences
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pub(crate) fn convert_regex(pattern: &str) -> Result<fancy_regex::Regex, fancy_regex::Error> {
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// replace control chars
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let new_pattern = CONTROL_GROUPS_RE.replace_all(pattern, replace_control_group);
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let mut out = String::with_capacity(new_pattern.len());
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let mut chars = new_pattern.chars().peekable();
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// To convert character group we need to iterate over chars and in case of `\` take a look
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// at the next char to detect whether this group should be converted
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while let Some(current) = chars.next() {
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if current == '\\' {
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// Possible character group
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if let Some(next) = chars.next() {
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match next {
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'd' => out.push_str("[0-9]"),
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'D' => out.push_str("[^0-9]"),
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'w' => out.push_str("[A-Za-z0-9_]"),
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'W' => out.push_str("[^A-Za-z0-9_]"),
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's' => {
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out.push_str("[ \t\n\r\u{000b}\u{000c}\u{2003}\u{feff}\u{2029}\u{00a0}]")
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}
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'S' => {
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out.push_str("[^ \t\n\r\u{000b}\u{000c}\u{2003}\u{feff}\u{2029}\u{00a0}]")
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}
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_ => {
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// Nothing interesting, push as is
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out.push(current);
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out.push(next)
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}
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}
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} else {
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// End of the string, push the last char.
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// Note that it is an incomplete escape sequence and will lead to an error on
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// the next step
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out.push(current);
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}
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} else {
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// Regular character
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out.push(current);
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}
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}
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fancy_regex::Regex::new(&out)
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}
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#[allow(clippy::integer_arithmetic)]
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fn replace_control_group(captures: ®ex::Captures) -> String {
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// There will be no overflow, because the minimum value is 65 (char 'A')
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((captures
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.index(0)
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.trim_start_matches(r"\c")
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.chars()
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.next()
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.expect("This is always present because of the regex rule. It has [A-Za-z] next")
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.to_ascii_uppercase() as u8
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- 64) as char)
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.to_string()
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}
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#[inline]
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pub(crate) fn compile<'a>(
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_: &'a Map<String, Value>,
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schema: &'a Value,
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context: &CompilationContext,
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) -> Option<CompilationResult<'a>> {
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Some(PatternValidator::compile(schema, context))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::{
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compilation::{context::BaseUri, DEFAULT_SCOPE},
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resolver::{DefaultResolver, Resolver},
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tests_util, JSONSchema,
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};
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use serde_json::{json, Value};
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use std::sync::Arc;
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use test_case::test_case;
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#[test_case(r"^[\w\-\.\+]+$", "CC-BY-4.0", true)]
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#[test_case(r"^[\w\-\.\+]+$", "CC-BY-!", false)]
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#[test_case(r"^\W+$", "1_0", false)]
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#[test_case(r"\\w", r"\w", true)]
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fn regex_matches(pattern: &str, text: &str, is_matching: bool) {
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let compiled = convert_regex(pattern).expect("A valid regex");
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assert_eq!(
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compiled.is_match(text).expect("A valid pattern"),
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is_matching
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);
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}
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#[test_case(r"\")]
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#[test_case(r"\d\")]
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fn invalid_escape_sequences(pattern: &str) {
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assert!(convert_regex(pattern).is_err())
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}
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#[test_case("^(?!eo:)", "eo:bands", false)]
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#[test_case("^(?!eo:)", "proj:epsg", true)]
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fn negative_lookbehind_match(pattern: &str, text: &str, is_matching: bool) {
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let pattern = Value::String(pattern.into());
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let text = Value::String(text.into());
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let schema_json = Arc::new(json!({}));
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let schema = JSONSchema::compile(&schema_json).unwrap();
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let resolver = Arc::new(
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Resolver::new(
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Arc::new(DefaultResolver),
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Default::default(),
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&DEFAULT_SCOPE,
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schema_json,
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Default::default(),
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)
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.unwrap(),
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);
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let context = CompilationContext::new(BaseUri::Unknown, schema.config(), resolver);
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let compiled = PatternValidator::compile(&pattern, &context).unwrap();
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assert_eq!(compiled.is_valid(&text), is_matching)
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}
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#[test]
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fn schema_path() {
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tests_util::assert_schema_path(&json!({"pattern": "^f"}), &json!("b"), "/pattern")
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}
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}
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