Line range hint 10-11: Excellent use of boolean expression style!

The code correctly follows the guideline of using false == <expression> rather than !<expression>.

Line range hint 17-18: Consistent boolean expression style maintained!

The code maintains consistency with the preferred false == <expression> pattern.

21-22: Verify consistent usage of new descriptor creation method

The change to create_from_escaped_tokens aligns with the PR's objective of improving string value handling. However, let's verify consistent usage across the codebase.

#!/bin/bash
# Description: Verify consistent usage of new method and identify any remaining old usage
# Look for both old and new method calls to ensure complete migration

echo "Checking for new method usage:"
rg "ColumnDescriptor::create_from_escaped_tokens" -A 2

echo "Checking for potential remaining old method usage:"
rg "ColumnDescriptor::create\(" -A 2

# Check for any TODO or FIXME comments related to this change
rg -i "todo.*columndescriptor|fixme.*columndescriptor"

#!/bin/bash
# Let's verify if there are any other methods in ColumnDescriptor class
# and check their implementation to understand the complete context

echo "Checking ColumnDescriptor class implementation:"
ast-grep --pattern 'class ColumnDescriptor {
  $$$
}'

echo "Checking for any tests using these methods:"
rg -l "ColumnDescriptor.*create" "*test*"

echo "Checking header file for method declarations:"
fd "ColumnDescriptor.h" --exec cat {}

209-209: Update to create_from_escaped_tokens enhances escaped token handling

The change to use ColumnDescriptor::create_from_escaped_tokens ensures that column descriptors are correctly created from escaped tokens, aligning with the improved handling of escaped strings throughout the codebase.

66-66: Efficient use of std::string_view for key handling

The change from std::string to std::string_view for cur_key and direct assignment from unescaped_key(true) is a good optimization that avoids unnecessary string copies.

Also applies to: 84-84

134-134: Verify error handling for malformed escape sequences

With the changes to use get_string(true) for unescaped strings, we should verify proper error handling for malformed escape sequences.

Also applies to: 210-210, 352-352

#!/bin/bash
# Description: Check error handling for malformed escape sequences

# Search for error handling around get_string calls
rg -B 2 -A 2 "get_string.*true"

# Search for try-catch blocks that might handle simdjson errors
ast-grep --pattern 'try {
  $$$
  $obj.get_string($$$)
  $$$
} catch'

#!/bin/bash
# Check for try-catch blocks around the usage of these string values
rg -B 5 -A 5 "case ondemand::json_type::string:"

# Look for any error handling related to simdjson
rg -B 2 -A 2 "simdjson::error"

# Check the class definition and member declarations for error handling
ast-grep --pattern 'class JsonParser {
  $$$
}'

#!/bin/bash
# Check for any try-catch blocks in JsonParser.cpp
rg -B 3 -A 3 "try\s*{"  components/core/src/clp_s/JsonParser.cpp

# Look for string parsing related error handling
rg -B 3 -A 3 "ondemand::json_type::string.*get_string" components/core/src/clp_s/JsonParser.cpp

# Check if there's any specific string validation
rg -B 2 -A 2 "validate.*string" components/core/src/clp_s/JsonParser.cpp

#!/bin/bash
# Check for try-catch blocks with fixed regex
rg -B 3 -A 3 "try {" components/core/src/clp_s/JsonParser.cpp

# Look for error handling in the string parsing function
rg -B 3 -A 3 "get_string\(" components/core/src/clp_s/JsonParser.cpp

# Check the JsonFileIterator implementation for string handling
rg -B 3 -A 3 "parse.*string" components/core/src/clp_s/JsonFileIterator.cpp

134-134: Verify string value lifetime management

The changes to use get_string(true) with std::string_view across multiple methods improve performance by avoiding copies. However, we should verify that the string views' lifetimes are properly managed.

Also applies to: 210-210, 352-352

#!/bin/bash
# Description: Check for potential string lifetime issues by finding all usages of string_view
# that might outlive the source string

# Search for string_view storage in class members or containers
rg -A 3 "string_view.*;" 

# Search for string_view being stored beyond the scope of get_string
ast-grep --pattern 'std::string_view $var = $obj.get_string($$$);
  $$$
  return $var;'

#!/bin/bash
# Check how string_view values from get_string() are used
ast-grep --pattern 'std::string_view $var = $obj.get_string($$$);
  $$$'

# Check for any string_view member variables that might store these values
rg "string_view.*;" -A 2 "JsonParser"

#!/bin/bash
# Search for get_string usage with more context
rg -A 5 -B 5 "get_string\(true\)" components/core/src/clp_s/JsonParser.cpp

# Check for any string_view storage in the JsonParser class
rg "string_view" components/core/src/clp_s/JsonParser.hpp

#!/bin/bash
# Check simdjson documentation/headers for string lifetime guarantees
rg -A 3 "get_string.*true" components/core/src/simdjson

# Check if the string_view values are used beyond their immediate scope
rg -A 10 "value = .*get_string\(true\)" components/core/src/clp_s/JsonParser.cpp

# Look for any string storage in the archive writer
rg "add_node.*NodeType::(ClpString|VarString|DateString)" components/core/src/clp_s/

4-4: Inclusion of <array> is appropriate

The addition of <array> is necessary to support the use of std::array in the code.

213-214: Documentation update enhances clarity

The updated documentation for tokenize_column_descriptor provides clearer information about its functionality related to KQL columns.

4-4: Including <simdjson.h> for JSON parsing is appropriate

The addition of <simdjson.h> is necessary for efficient JSON parsing.

436-485: The tokenize_column_descriptor function correctly handles escaping and tokenization

The updated logic in tokenize_column_descriptor properly manages escape sequences and token boundaries, ensuring accurate tokenization of descriptors.

486-540: The escape_json_string method efficiently escapes JSON strings

The implementation using a lambda function and unescaped slices optimizes performance when processing JSON strings.

541-569: convert_four_byte_hex_to_utf8 correctly converts hex sequences to UTF-8

The function appropriately handles Unicode conversion using simdjson, ensuring correct interpretation of Unicode escape sequences.

571-674: The unescape_kql_value and unescape_kql_internal methods correctly unescape KQL values

The methods effectively manage various escape sequences, including Unicode characters, ensuring accurate unescaping of KQL values.

73-77: Special keys are properly escaped before being stored

The add_special_key method ensures that keys are correctly escaped using StringUtils::escape_json_string.

119-119: append_key correctly delegates to append_escaped_key

This change ensures that keys are appended with proper escaping.

123-123: Escaping keys before appending enhances JSON correctness

Using StringUtils::escape_json_string ensures keys are correctly escaped in the JSON output.

140-140: Values are properly escaped when appended with quotes

The use of extract_escaped_string_value_into_buffer guarantees that string values are correctly escaped before being added to the JSON string.

145-149: append_escaped_key correctly appends already escaped keys

As the keys are pre-escaped, this method correctly appends them to the JSON string without additional escaping.

5-5: Including "Utils.hpp" is appropriate for utility functions

This inclusion allows the use of StringUtils methods within the file.

143-149: VariableStringColumnReader correctly escapes string values

The method ensures that string values are properly escaped before being appended, maintaining JSON validity.

56-65: Well-structured virtual method addition!

The new virtual method follows good design practices with clear documentation and a sensible default implementation.

166-168: Correct override declaration!

The method is properly declared with the override specifier.

213-215: Correct override declaration!

The method is properly declared with the override specifier.

6-6: Appropriate include addition!

The fmt library include is correctly placed and necessary for the new formatting functionality.

69-70: Good use of the new token creation method!

Using create_descriptor_from_escaped_token improves the handling of escape sequences in descriptors.

87-88: Consistent use of the new token creation method!

The change maintains consistency with other sections in handling escaped tokens.

133-134: Consistent token creation across expression types!

The changes maintain consistency in token creation across AND and OR expressions.

Also applies to: 183-184

243-267: Excellent test coverage for escape sequences!

The new test section provides comprehensive coverage of various escape sequences, including:

• Backslashes and special characters
• Unicode sequences
• Control characters
• Special KQL characters

The test structure using input/output pairs makes the expected behaviour clear and maintainable.

19-24: Good addition of custom exception class for improved error handling

The introduction of the OperationFailed exception class enhances error reporting by providing more specific context when token operations fail.

32-34: Refactoring with static factory methods enhances clarity

The use of static methods create_descriptor_from_escaped_token and create_descriptor_from_literal_token improves code readability and enforces consistent creation of DescriptorToken instances.

Also applies to: 40-41

124-130: New static methods improve ColumnDescriptor instantiation

Adding create_from_escaped_token, create_from_escaped_tokens, and create_from_descriptors methods enhances clarity and ensures consistent creation of ColumnDescriptor objects.

61-61: Appropriate inclusion of UNICODE in UNQUOTED_CHARACTER

Adding UNICODE to UNQUOTED_CHARACTER fragment extends the grammar to support Unicode escape sequences in unquoted literals, enhancing the language's expressiveness.

9-9: Use of create_descriptor_from_escaped_token improves consistency

Replacing direct instantiation with create_descriptor_from_escaped_token ensures consistent token creation and proper handling of escaped tokens throughout the codebase.

Also applies to: 27-27

52-66: Renaming and updating create methods enhances clarity

Renaming the create methods to create_from_escaped_token, create_from_escaped_tokens, and create_from_descriptors clarifies their purpose and improves code readability, making the codebase more maintainable.

2-2: Include <stdexcept> for exception handling

Adding the <stdexcept> header allows the use of standard exceptions like std::runtime_error, ensuring proper error handling.

Line range hint 73-77: Fix potential out-of-bounds access by checking for empty string

Adding the check false == text.empty() before accessing text.at(0) prevents potential exceptions when text is empty, enhancing the robustness of the unquote_string function.

129-129: Update method calls to use new creation methods

Using create_from_escaped_tokens and create_from_escaped_token in visitColumn and visitValue_expression ensures proper handling of escaped tokens and aligns with the updated ColumnDescriptor interface.

Also applies to: 205-205

6-6: LGTM: fmt library inclusion

The addition of the fmt library is appropriate for safe string formatting in the new test cases.

69-70: LGTM: Consistent use of create_descriptor_from_escaped_token

The replacement of direct DescriptorToken instantiation with create_descriptor_from_escaped_token is consistent throughout the test file and aligns with the PR's objective of improving escape sequence handling.

Also applies to: 87-88, 133-134, 183-184, 214-217