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JsonPathParser.cs
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JsonPathParser.cs
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using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.Json;
using System.Text.RegularExpressions;
namespace JsonCons.JsonPath
{
/// <summary>
/// Defines a custom exception object that is thrown when JSONPath parsing fails.
/// </summary>
public class JsonPathParseException : Exception
{
/// <summary>
/// The line in the JSONPath string where a parse error was detected.
/// </summary>
public int LineNumber {get;}
/// <summary>
/// The column in the JSONPath string where a parse error was detected.
/// </summary>
public int ColumnNumber {get;}
internal JsonPathParseException(string message, int line, int column)
: base(message)
{
LineNumber = line;
ColumnNumber = column;
}
/// <summary>
/// Returns an error message that describes the current exception.
/// </summary>
/// <returns>A string representation of the current exception.</returns>
public override string ToString ()
{
return $"{base.Message} at line {LineNumber} and column {ColumnNumber}";
}
};
enum JsonPathState
{
Start,
RelativeLocation,
ExpectedDotOrLeftBracketOrCaret,
RelativePathOrRecursiveDescent,
BracketExpressionOrRelativePath,
RootOrCurrentNode,
ExpectFunctionExpr,
RelativePath,
ParentOperator,
AncestorDepth,
FilterExpression,
ExpressionRhs,
UnaryOperatorOrPathOrValueOrFunction,
Json,
JsonString,
JsonNumber,
StringValue,
Function,
FunctionName,
JsonLiteral,
AppendDoubleQuote,
IdentifierOrFunctionExpr,
UnquotedString,
Number,
FunctionExpression,
Argument,
ZeroOrOneArguments,
OneOrMoreArguments,
Identifier,
SingleQuotedString,
DoubleQuotedString,
BracketedUnquotedNameOrUnion,
UnionExpression,
IdentifierOrUnion,
BracketExpression,
BracketedWildcard,
IndexOrSlice,
Index,
WildcardOrUnion,
UnionElement,
IndexOrSliceOrUnion,
Integer,
Digit,
SliceExpressionStop,
SliceExpressionStep,
CommaOrRightBracket,
ExpectRightBracket,
ExpectRightParen,
QuotedStringEscapeChar,
EscapeU1,
EscapeU2,
EscapeU3,
EscapeU4,
EscapeExpectSurrogatePair1,
EscapeExpectSurrogatePair2,
EscapeU5,
EscapeU6,
EscapeU7,
EscapeU8,
Expression,
ComparatorExpression,
EqOrRegex,
ExpectRegex,
Regex,
RegexOptions,
RegexPattern,
CmpLtOrLte,
CmpGtOrGte,
CmpNe,
ExpectOr,
ExpectAnd
};
ref struct JsonPathParser
{
ReadOnlyMemory<char> _source;
ReadOnlySpan<char> _span;
int _start;
int _current;
int _column;
int _line;
Stack<JsonPathState> _stateStack;
Stack<Token>_outputStack;
Stack<Token>_operatorStack;
internal JsonPathParser(string input)
{
_source = input.AsMemory();
_span = input.AsSpan();
_start = 0;
_current = 0;
_column = 1;
_line = 1;
_stateStack = new Stack<JsonPathState>();
_outputStack = new Stack<Token>();
_operatorStack = new Stack<Token>();
}
internal JsonSelector Parse()
{
_stateStack = new Stack<JsonPathState>();
_current = 0;
_column = 1;
_stateStack.Push(JsonPathState.Start);
StringBuilder buffer = new StringBuilder();
StringBuilder buffer2 = new StringBuilder();
Int32? sliceStart = null;
Int32? sliceStop = null;
Int32 sliceStep = 1;
UInt32 cp = 0;
UInt32 cp2 = 0;
int jsonLevel = 0;
bool pathsRequired = false;
int ancestorDepth = 0;
while (_current < _span.Length)
{
switch (_stateStack.Peek())
{
case JsonPathState.Start:
{
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '$':
case '@':
{
PushToken(new Token(new CurrentNodeSelector()));
_stateStack.Pop();
_stateStack.Push(JsonPathState.ExpectedDotOrLeftBracketOrCaret);
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
}
default:
{
throw new JsonPathParseException("Syntax error", _line, _column);
}
}
break;
}
case JsonPathState.ExpectedDotOrLeftBracketOrCaret:
{
throw new JsonPathParseException("Expected '.' or '[' or '^'", _line, _column);
}
case JsonPathState.RelativeLocation:
{
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '.':
{
_stateStack.Push(JsonPathState.RelativePathOrRecursiveDescent);
++_current;
++_column;
break;
}
case '[':
_stateStack.Push(JsonPathState.BracketExpression);
++_current;
++_column;
break;
case '^':
ancestorDepth = 0;
_stateStack.Push(JsonPathState.ParentOperator);
_stateStack.Push(JsonPathState.AncestorDepth);
break;
default:
{
_stateStack.Pop();
break;
}
}
break;
}
case JsonPathState.ParentOperator:
{
PushToken(new Token(new ParentNodeSelector(ancestorDepth)));
pathsRequired = true;
ancestorDepth = 0;
++_current;
++_column;
_stateStack.Pop();
break;
}
case JsonPathState.AncestorDepth:
{
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '^':
{
++ancestorDepth;
++_current;
++_column;
break;
}
default:
{
_stateStack.Pop();
break;
}
}
break;
}
case JsonPathState.RelativePathOrRecursiveDescent:
switch (_span[_current])
{
case '.':
PushToken(new Token(new RecursiveDescentSelector()));
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.BracketExpressionOrRelativePath);
break;
default:
_stateStack.Pop();
_stateStack.Push(JsonPathState.RelativePath);
break;
}
break;
case JsonPathState.BracketExpressionOrRelativePath:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '[': // [ can follow ..
_stateStack.Pop();
_stateStack.Push(JsonPathState.BracketExpression);
++_current;
++_column;
break;
default:
buffer.Clear();
_stateStack.Pop();
_stateStack.Push(JsonPathState.RelativePath);
break;
}
break;
case JsonPathState.RelativePath:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '\'':
// Single quoted string
_stateStack.Pop();
_stateStack.Push(JsonPathState.Identifier);
_stateStack.Push(JsonPathState.SingleQuotedString);
++_current;
++_column;
break;
case '\"':
// Double quoted string
_stateStack.Pop();
_stateStack.Push(JsonPathState.Identifier);
_stateStack.Push(JsonPathState.DoubleQuotedString);
++_current;
++_column;
break;
case '*':
// Wildcard
PushToken(new Token(new WildcardSelector()));
_stateStack.Pop();
++_current;
++_column;
break;
default:
if (!char.IsSurrogate(_span[_current]))
{
int codepoint = (int)(_span[_current]);
if (IsUnquotedStringCodepoint(codepoint))
{
buffer.Append (_span[_current]);
++_current;
++_column;
}
else
{
throw new JsonPathParseException("Expected unquoted string, or single or double quoted string, or index or '*'", _line, _column);
}
}
else if (_current + 1 < _span.Length && char.IsSurrogatePair(_span[_current], _span[_current + 1]))
{
int codepoint = char.ConvertToUtf32(_span[_current], _span[_current + 1]);
if (IsUnquotedStringCodepoint(codepoint))
{
buffer.Append(_span[_current]);
++_current;
++_column;
buffer.Append(_span[_current]);
++_current;
++_column;
}
else
{
throw new JsonPathParseException("Expected unquoted string, or single or double quoted string, or index or '*'", _line, _column);
}
}
else
{
throw new JsonPathParseException("String is not well formed", _line, _column);
}
_stateStack.Pop();
_stateStack.Push(JsonPathState.IdentifierOrFunctionExpr);
_stateStack.Push(JsonPathState.UnquotedString);
break;
}
break;
case JsonPathState.RootOrCurrentNode:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '$':
PushToken(new Token(TokenType.RootNode));
PushToken(new Token(new RootSelector(_current)));
_stateStack.Pop();
++_current;
++_column;
break;
case '@':
PushToken(new Token(TokenType.CurrentNode));
PushToken(new Token(new CurrentNodeSelector()));
_stateStack.Pop();
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Syntax error", _line, _column);
}
break;
case JsonPathState.UnquotedString:
{
if (!char.IsSurrogate(_span[_current]))
{
int codepoint = (int)(_span[_current]);
if (IsUnquotedStringCodepoint(codepoint))
{
buffer.Append (_span[_current]);
++_current;
++_column;
}
else
{
_stateStack.Pop(); // UnquotedString
}
}
else if (_current + 1 < _span.Length && char.IsSurrogatePair(_span[_current], _span[_current + 1]))
{
int codepoint = char.ConvertToUtf32(_span[_current], _span[_current + 1]);
if (IsUnquotedStringCodepoint(codepoint))
{
buffer.Append (_span[_current]);
++_current;
++_column;
buffer.Append (_span[_current]);
++_current;
++_column;
}
else
{
_stateStack.Pop(); // UnquotedString
}
}
else
{
throw new JsonPathParseException("String is not well formed", _line, _column);
}
break;
}
case JsonPathState.IdentifierOrFunctionExpr:
{
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '(':
{
IFunction func;
string functionName = buffer.ToString();
if (!BuiltInFunctions.Instance.TryGetFunction(functionName, out func))
{
throw new JsonPathParseException($"Function '{functionName}' not found", _line, _column);
}
buffer.Clear();
PushToken(new Token(func));
_stateStack.Pop();
_stateStack.Push(JsonPathState.FunctionExpression);
_stateStack.Push(JsonPathState.ZeroOrOneArguments);
++_current;
++_column;
break;
}
default:
{
PushToken(new Token(new IdentifierSelector(buffer.ToString())));
buffer.Clear();
_stateStack.Pop();
break;
}
}
break;
}
case JsonPathState.Identifier:
PushToken(new Token(new IdentifierSelector(buffer.ToString())));
buffer.Clear();
_stateStack.Pop();
break;
case JsonPathState.SingleQuotedString:
switch (_span[_current])
{
case '\'':
_stateStack.Pop();
++_current;
++_column;
break;
case '\\':
_stateStack.Push(JsonPathState.QuotedStringEscapeChar);
++_current;
++_column;
break;
default:
buffer.Append (_span[_current]);
++_current;
++_column;
break;
};
break;
case JsonPathState.DoubleQuotedString:
switch (_span[_current])
{
case '\"':
_stateStack.Pop();
++_current;
++_column;
break;
case '\\':
_stateStack.Push(JsonPathState.QuotedStringEscapeChar);
++_current;
++_column;
break;
default:
buffer.Append (_span[_current]);
++_current;
++_column;
break;
};
break;
case JsonPathState.QuotedStringEscapeChar:
switch (_span[_current])
{
case '\"':
buffer.Append('\"');
++_current;
++_column;
_stateStack.Pop();
break;
case '\'':
buffer.Append('\'');
++_current;
++_column;
_stateStack.Pop();
break;
case '\\':
buffer.Append('\\');
++_current;
++_column;
_stateStack.Pop();
break;
case '/':
buffer.Append('/');
++_current;
++_column;
_stateStack.Pop();
break;
case 'b':
buffer.Append('\b');
++_current;
++_column;
_stateStack.Pop();
break;
case 'f':
buffer.Append('\f');
++_current;
++_column;
_stateStack.Pop();
break;
case 'n':
buffer.Append('\n');
++_current;
++_column;
_stateStack.Pop();
break;
case 'r':
buffer.Append('\r');
++_current;
++_column;
_stateStack.Pop();
break;
case 't':
buffer.Append('\t');
++_current;
++_column;
_stateStack.Pop();
break;
case 'u':
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU1);
break;
default:
throw new JsonPathParseException($"Illegal escape character '{_span[_current]}'", _line, _column);
}
break;
case JsonPathState.EscapeU1:
cp = AppendToCodepoint(0, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU2);
break;
case JsonPathState.EscapeU2:
cp = AppendToCodepoint(cp, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU3);
break;
case JsonPathState.EscapeU3:
cp = AppendToCodepoint(cp, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU4);
break;
case JsonPathState.EscapeU4:
cp = AppendToCodepoint(cp, _span[_current]);
if (Char.IsHighSurrogate((Char)cp))
{
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeExpectSurrogatePair1);
}
else
{
buffer.Append(Char.ConvertFromUtf32((int)cp));
++_current;
++_column;
_stateStack.Pop();
}
break;
case JsonPathState.EscapeExpectSurrogatePair1:
switch (_span[_current])
{
case '\\':
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeExpectSurrogatePair2);
break;
default:
throw new JsonPathParseException("Invalid codepoint", _line, _column);
}
break;
case JsonPathState.EscapeExpectSurrogatePair2:
switch (_span[_current])
{
case 'u':
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU5);
break;
default:
throw new JsonPathParseException("Invalid codepoint", _line, _column);
}
break;
case JsonPathState.EscapeU5:
cp2 = AppendToCodepoint(0, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU6);
break;
case JsonPathState.EscapeU6:
cp2 = AppendToCodepoint(cp2, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU7);
break;
case JsonPathState.EscapeU7:
cp2 = AppendToCodepoint(cp2, _span[_current]);
++_current;
++_column;
_stateStack.Pop();
_stateStack.Push(JsonPathState.EscapeU8);
break;
case JsonPathState.EscapeU8:
{
cp2 = AppendToCodepoint(cp2, _span[_current]);
UInt32 codepoint = 0x10000 + ((cp & 0x3FF) << 10) + (cp2 & 0x3FF);
buffer.Append(Char.ConvertFromUtf32((int)codepoint));
_stateStack.Pop();
++_current;
++_column;
break;
}
case JsonPathState.ExpectRightBracket:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ']':
_stateStack.Pop();
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected ']'", _line, _column);
}
break;
case JsonPathState.ExpectRightParen:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ')':
++_current;
++_column;
PushToken(new Token(TokenType.RightParen));
_stateStack.Pop();
_stateStack.Push(JsonPathState.ExpressionRhs);
break;
default:
throw new JsonPathParseException("Expected ')'", _line, _column);
}
break;
case JsonPathState.BracketExpression:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '\'':
// Single quoted string
_stateStack.Pop();
_stateStack.Push(JsonPathState.IdentifierOrUnion);
_stateStack.Push(JsonPathState.SingleQuotedString);
++_current;
++_column;
break;
case '\"':
// Double quoted string
_stateStack.Pop();
_stateStack.Push(JsonPathState.IdentifierOrUnion);
_stateStack.Push(JsonPathState.DoubleQuotedString);
++_current;
++_column;
break;
case '-':case '0':case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8':case '9':
// Index or slice
_stateStack.Pop();
_stateStack.Push(JsonPathState.IndexOrSliceOrUnion);
_stateStack.Push(JsonPathState.Integer);
break;
case ':':
// Slice expression
_stateStack.Pop();
_stateStack.Push(JsonPathState.IndexOrSliceOrUnion);
break;
case '*':
// Wildcard
_stateStack.Pop();
_stateStack.Push(JsonPathState.WildcardOrUnion);
++_current;
++_column;
break;
case '?':
{
// Filter expression
PushToken(new Token(TokenType.BeginUnion));
PushToken(new Token(TokenType.BeginFilter));
_stateStack.Pop(); _stateStack.Push(JsonPathState.UnionExpression); // union
_stateStack.Push(JsonPathState.FilterExpression);
_stateStack.Push(JsonPathState.ExpressionRhs);
_stateStack.Push(JsonPathState.UnaryOperatorOrPathOrValueOrFunction);
++_current;
++_column;
break;
}
case '$': // JsonPath
PushToken(new Token(TokenType.BeginUnion));
PushToken(new Token(new RootSelector(_current)));
_stateStack.Pop();
_stateStack.Push(JsonPathState.UnionExpression); // union
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
case '@': // JsonPath
PushToken(new Token(TokenType.BeginUnion));
PushToken(new Token(new CurrentNodeSelector()));
_stateStack.Pop();
_stateStack.Push(JsonPathState.UnionExpression); // union
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected single or double quoted string or index or slice or '*' or '?' or JSONPath", _line, _column);
}
break;
case JsonPathState.WildcardOrUnion:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ']':
PushToken(new Token(new WildcardSelector()));
buffer.Clear();
_stateStack.Pop();
++_current;
++_column;
break;
case ',':
PushToken(new Token(TokenType.BeginUnion));
PushToken(new Token(new WildcardSelector()));
PushToken(new Token(TokenType.Separator));
buffer.Clear();
_stateStack.Pop();
_stateStack.Push(JsonPathState.UnionExpression);
_stateStack.Push(JsonPathState.UnionElement);
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected right bracket", _line, _column);
}
break;
case JsonPathState.UnionExpression:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '.':
_stateStack.Push(JsonPathState.RelativePath);
++_current;
++_column;
break;
case '[':
_stateStack.Push(JsonPathState.BracketExpression);
++_current;
++_column;
break;
case ',':
PushToken(new Token(TokenType.Separator));
_stateStack.Push(JsonPathState.UnionElement);
++_current;
++_column;
break;
case ']':
PushToken(new Token(TokenType.EndUnion));
_stateStack.Pop();
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected right bracket", _line, _column);
}
break;
case JsonPathState.UnionElement:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ':': // SliceExpression
_stateStack.Pop();
_stateStack.Push(JsonPathState.IndexOrSlice);
break;
case '-':case '0':case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8':case '9':
_stateStack.Pop();
_stateStack.Push(JsonPathState.IndexOrSlice);
_stateStack.Push(JsonPathState.Integer);
break;
case '?':
{
PushToken(new Token(TokenType.BeginFilter));
_stateStack.Pop();
_stateStack.Push(JsonPathState.FilterExpression);
_stateStack.Push(JsonPathState.ExpressionRhs);
_stateStack.Push(JsonPathState.UnaryOperatorOrPathOrValueOrFunction);
++_current;
++_column;
break;
}
case '*':
PushToken(new Token(new WildcardSelector()));
_stateStack.Pop();
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
case '$':
PushToken(new Token(new RootSelector(_current)));
_stateStack.Pop();
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
case '@':
PushToken(new Token(new CurrentNodeSelector()));
_stateStack.Pop();
_stateStack.Push(JsonPathState.RelativeLocation);
++_current;
++_column;
break;
case '\'':
_stateStack.Pop();
_stateStack.Push(JsonPathState.Identifier);
_stateStack.Push(JsonPathState.SingleQuotedString);
++_current;
++_column;
break;
case '\"':
_stateStack.Pop();
_stateStack.Push(JsonPathState.Identifier);
_stateStack.Push(JsonPathState.DoubleQuotedString);
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected bracket specifier or union", _line, _column);
}
break;
case JsonPathState.FilterExpression:
{
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ',':
case ']':
{
PushToken(new Token(TokenType.EndFilter));
_stateStack.Pop();
break;
}
default:
throw new JsonPathParseException("Expected comma or right bracket", _line, _column);
}
break;
}
case JsonPathState.IdentifierOrUnion:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ']':
PushToken(new Token(new IdentifierSelector(buffer.ToString())));
buffer.Clear();
_stateStack.Pop();
++_current;
++_column;
break;
case ',':
PushToken(new Token(TokenType.BeginUnion));
PushToken(new Token(new IdentifierSelector(buffer.ToString())));
PushToken(new Token(TokenType.Separator));
buffer.Clear();
_stateStack.Pop();
_stateStack.Push(JsonPathState.UnionExpression); // union
_stateStack.Push(JsonPathState.UnionElement);
++_current;
++_column;
break;
default:
throw new JsonPathParseException("Expected right bracket", _line, _column);
}
break;
case JsonPathState.BracketedWildcard:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case '[':
case ']':
case ',':
case '.':
PushToken(new Token(new WildcardSelector()));
buffer.Clear();
_stateStack.Pop();
break;
default:
throw new JsonPathParseException("Expected right bracket", _line, _column);
}
break;
case JsonPathState.IndexOrSliceOrUnion:
switch (_span[_current])
{
case ' ':case '\t':case '\r':case '\n':
SkipWhiteSpace();
break;
case ']':
{
Int32 n;
if (!Int32.TryParse(buffer.ToString(),out n))
{
throw new JsonPathParseException("Invalid index", _line, _column);
}
PushToken(new Token(new IndexSelector(n)));
buffer.Clear();
_stateStack.Pop(); // IndexOrSliceOrUnion
++_current;
++_column;
break;
}
case ',':
{
PushToken(new Token(TokenType.BeginUnion));
Int32 n;
if (!Int32.TryParse(buffer.ToString(), out n))
{
throw new JsonPathParseException("Invalid index", _line, _column);
}
PushToken(new Token(new IndexSelector(n)));
buffer.Clear();
PushToken(new Token(TokenType.Separator));
buffer.Clear();