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715 lines
17 KiB
C++
715 lines
17 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. =================//
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//
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// Read JSON-formatted data into KeyValues
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//
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//=============================================================================//
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#include "tier1/keyvaluesjson.h"
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#include "tier1/utlbuffer.h"
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#include "tier1/strtools.h"
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#include <stdint.h> // INT32_MIN defn
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KeyValuesJSONParser::KeyValuesJSONParser( const CUtlBuffer &buf )
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{
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Init( (const char *)buf.Base(), buf.TellPut() );
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}
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KeyValuesJSONParser::KeyValuesJSONParser( const char *pszText, int cbSize )
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{
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Init( pszText, cbSize >= 0 ? cbSize : V_strlen(pszText) );
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}
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KeyValuesJSONParser::~KeyValuesJSONParser() {}
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void KeyValuesJSONParser::Init( const char *pszText, int cbSize )
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{
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m_szErrMsg[0] = '\0';
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m_nLine = 1;
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m_cur = pszText;
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m_end = pszText+cbSize;
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m_eToken = kToken_Null;
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NextToken();
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}
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KeyValues *KeyValuesJSONParser::ParseFile()
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{
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// A valid JSON object should contain a single object, surrounded by curly braces.
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if ( m_eToken == kToken_EOF )
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{
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V_sprintf_safe( m_szErrMsg, "Input contains no data" );
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return NULL;
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}
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if ( m_eToken == kToken_Err )
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return NULL;
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if ( m_eToken == '{' )
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{
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// Parse the the entire file as one big object
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KeyValues *pResult = new KeyValues("");
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if ( !ParseObject( pResult ) )
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{
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pResult->deleteThis();
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return NULL;
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}
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if ( m_eToken == kToken_EOF )
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return pResult;
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pResult->deleteThis();
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}
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V_sprintf_safe( m_szErrMsg, "%s not expected here. A valid JSON document should be a single object, which begins with '{' and ends with '}'", GetTokenDebugText() );
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return NULL;
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}
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bool KeyValuesJSONParser::ParseObject( KeyValues *pObject )
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{
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Assert( m_eToken == '{' );
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int nOpenDelimLine = m_nLine;
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NextToken();
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KeyValues *pLastChild = NULL;
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while ( m_eToken != '}' )
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{
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// Parse error?
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if ( m_eToken == kToken_Err )
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return false;
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if ( m_eToken == kToken_EOF )
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{
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// Actually report the error at the line of the unmatched delimiter.
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// There's no need to report the line number of the end of file, that is always
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// useless.
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m_nLine = nOpenDelimLine;
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V_strcpy_safe( m_szErrMsg, "End of input was reached and '{' was not matched by '}'" );
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return false;
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}
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// It must be a string, for the key name
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if ( m_eToken != kToken_String )
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{
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V_sprintf_safe( m_szErrMsg, "%s not expected here; expected string for key name or '}'", GetTokenDebugText() );
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return false;
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}
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KeyValues *pChildValue = new KeyValues( m_vecTokenChars.Base() );
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NextToken();
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// Expect and eat colon
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if ( m_eToken != ':' )
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{
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V_sprintf_safe( m_szErrMsg, "%s not expected here. Missing ':'?", GetTokenDebugText() );
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pChildValue->deleteThis();
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return false;
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}
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NextToken();
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// Recursively parse the value
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if ( !ParseValue( pChildValue ) )
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{
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pChildValue->deleteThis();
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return false;
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}
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// Add to parent.
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pObject->AddSubkeyUsingKnownLastChild( pChildValue, pLastChild );
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pLastChild = pChildValue;
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// Eat the comma, if there is one. If no comma,
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// then the other thing that could come next
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// is the closing brace to close the object
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// NOTE: We are allowing the extra comma after the last item
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if ( m_eToken == ',' )
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{
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NextToken();
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}
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else if ( m_eToken != '}' )
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{
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V_sprintf_safe( m_szErrMsg, "%s not expected here. Missing ',' or '}'?", GetTokenDebugText() );
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return false;
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}
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}
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// Eat closing '}'
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NextToken();
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// Success
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return true;
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}
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bool KeyValuesJSONParser::ParseArray( KeyValues *pArray )
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{
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Assert( m_eToken == '[' );
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int nOpenDelimLine = m_nLine;
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NextToken();
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KeyValues *pLastChild = NULL;
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int idx = 0;
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while ( m_eToken != ']' )
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{
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// Parse error?
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if ( m_eToken == kToken_Err )
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return false;
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if ( m_eToken == kToken_EOF )
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{
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// Actually report the error at the line of the unmatched delimiter.
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// There's no need to report the line number of the end of file, that is always
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// useless.
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m_nLine = nOpenDelimLine;
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V_strcpy_safe( m_szErrMsg, "End of input was reached and '[' was not matched by ']'" );
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return false;
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}
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// Set a dummy key name based on the index
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char szKeyName[ 32 ];
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V_sprintf_safe( szKeyName, "%d", idx );
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++idx;
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KeyValues *pChildValue = new KeyValues( szKeyName );
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// Recursively parse the value
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if ( !ParseValue( pChildValue ) )
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{
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pChildValue->deleteThis();
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return false;
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}
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// Add to parent.
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pArray->AddSubkeyUsingKnownLastChild( pChildValue, pLastChild );
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pLastChild = pChildValue;
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// Handle a colon here specially. If one appears, the odds are they
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// are trying to put object-like data inside of an array
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if ( m_eToken == ':' )
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{
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V_sprintf_safe( m_szErrMsg, "':' not expected inside an array. ('[]' used when '{}' was intended?)" );
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return false;
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}
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// Eat the comma, if there is one. If no comma,
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// then the other thing that could come next
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// is the closing brace to close the object
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// NOTE: We are allowing the extra comma after the last item
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if ( m_eToken == ',' )
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{
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NextToken();
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}
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else if ( m_eToken != ']' )
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{
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V_sprintf_safe( m_szErrMsg, "%s not expected here. Missing ',' or ']'?", GetTokenDebugText() );
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return false;
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}
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}
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// Eat closing ']'
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NextToken();
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// Success
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return true;
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}
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bool KeyValuesJSONParser::ParseValue( KeyValues *pValue )
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{
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switch ( m_eToken )
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{
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case '{': return ParseObject( pValue );
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case '[': return ParseArray( pValue );
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case kToken_String:
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pValue->SetString( NULL, m_vecTokenChars.Base() );
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NextToken();
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return true;
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case kToken_NumberInt:
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{
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const char *pszNum = m_vecTokenChars.Base();
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// Negative?
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if ( *pszNum == '-' )
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{
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int64 val64 = V_atoi64( pszNum );
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if ( val64 < INT32_MIN )
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{
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// !KLUDGE! KeyValues cannot support this!
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V_sprintf_safe( m_szErrMsg, "%s is out of range for KeyValues, which doesn't support signed 64-bit numbers", pszNum );
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return false;
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}
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pValue->SetInt( NULL, (int)val64 );
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}
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else
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{
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uint64 val64 = V_atoui64( pszNum );
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if ( val64 > 0x7fffffffU )
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{
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pValue->SetUint64( NULL, val64 );
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}
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else
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{
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pValue->SetInt( NULL, (int)val64 );
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}
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}
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NextToken();
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return true;
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}
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case kToken_NumberFloat:
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{
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float f = V_atof( m_vecTokenChars.Base() );
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pValue->SetFloat( NULL, f );
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NextToken();
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return true;
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}
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case kToken_True:
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pValue->SetBool( NULL, true );
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NextToken();
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return true;
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case kToken_False:
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pValue->SetBool( NULL, false );
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NextToken();
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return true;
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case kToken_Null:
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pValue->SetPtr( NULL, NULL );
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NextToken();
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return true;
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case kToken_Err:
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return false;
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}
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V_sprintf_safe( m_szErrMsg, "%s not expected here; missing value?", GetTokenDebugText() );
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return false;
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}
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void KeyValuesJSONParser::NextToken()
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{
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// Already in terminal state?
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if ( m_eToken < 0 )
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return;
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// Clear token
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m_vecTokenChars.SetCount(0);
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// Scan until we hit the end of input
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while ( m_cur < m_end )
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{
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// Next character?
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char c = *m_cur;
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switch (c)
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{
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// Whitespace? Eat it and keep parsing
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case ' ':
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case '\t':
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++m_cur;
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break;
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// Newline? Eat it and advance line number
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case '\n':
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case '\r':
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++m_nLine;
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++m_cur;
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// Eat \r\n or \n\r pair as a single character
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if ( m_cur < m_end && *m_cur == ( '\n' + '\r' - c ) )
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++m_cur;
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break;
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// Single-character JSON token?
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case ':':
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case '{':
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case '}':
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case '[':
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case ']':
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case ',':
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m_eToken = c;
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++m_cur;
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return;
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// String?
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case '\"':
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case '\'': // NOTE: We allow strings to be delimited by single quotes, which is not JSON compliant
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ParseStringToken();
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return;
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case '-':
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case '.':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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ParseNumberToken();
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return;
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// Literal "true"
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case 't':
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if ( m_cur + 4 <= m_end && m_cur[1] == 'r' && m_cur[2] == 'u' && m_cur[3] == 'e' )
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{
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m_cur += 4;
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m_eToken = kToken_True;
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return;
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}
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goto unexpected_char;
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// Literal "false"
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case 'f':
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if ( m_cur + 5 <= m_end && m_cur[1] == 'a' && m_cur[2] == 'l' && m_cur[3] == 's' && m_cur[4] == 'e' )
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{
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m_cur += 5;
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m_eToken = kToken_False;
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return;
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}
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goto unexpected_char;
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// Literal "null"
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case 'n':
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if ( m_cur + 4 <= m_end && m_cur[1] == 'u' && m_cur[2] == 'l' && m_cur[3] == 'l' )
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{
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m_cur += 4;
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m_eToken = kToken_Null;
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return;
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}
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goto unexpected_char;
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case '/':
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// C++-style comment?
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if ( m_cur < m_end && m_cur[1] == '/' )
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{
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m_cur += 2;
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while ( m_cur < m_end && *m_cur != '\n' && *m_cur != '\r' )
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++m_cur;
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// Leave newline as the next character, we'll handle it above
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break;
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}
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// | fall
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// | through
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// V
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default:
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unexpected_char:
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if ( V_isprint(c) )
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V_sprintf_safe( m_szErrMsg, "Unexpected character 0x%02x ('%c')", (uint8)c, c );
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else
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V_sprintf_safe( m_szErrMsg, "Unexpected character 0x%02x", (uint8)c );
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m_eToken = kToken_Err;
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return;
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}
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}
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m_eToken = kToken_EOF;
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}
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void KeyValuesJSONParser::ParseNumberToken()
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{
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// Clear token
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m_vecTokenChars.SetCount(0);
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// Eat leading minus sign
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if ( *m_cur == '-' )
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{
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m_vecTokenChars.AddToTail( '-' );
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++m_cur;
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}
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if ( m_cur >= m_end )
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{
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V_strcpy_safe( m_szErrMsg, "Unexpected EOF while parsing number" );
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m_eToken = kToken_Err;
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return;
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}
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char c = *m_cur;
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m_vecTokenChars.AddToTail( c );
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bool bHasWholePart = false;
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switch ( c )
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{
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case '0':
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// Leading 0 cannot be followed by any more digits, as per JSON spec (and to make sure nobody tries to parse octal).
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++m_cur;
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bHasWholePart = true;
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break;
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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bHasWholePart = true;
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++m_cur;
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// Accumulate digits until we hit a non-digit
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while ( m_cur < m_end && *m_cur >= '0' && *m_cur <= '9' )
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m_vecTokenChars.AddToTail( *(m_cur++) );
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break;
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case '.':
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// strict JSON doesn't allow a number that starts with a decimal point, but we do
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break;
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}
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// Assume this is integral, unless we hit a decimal point and/or exponent
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m_eToken = kToken_NumberInt;
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// Fractional portion?
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if ( m_cur < m_end && *m_cur == '.' )
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{
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m_eToken = kToken_NumberFloat;
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// Eat decimal point
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m_vecTokenChars.AddToTail( *(m_cur++) );
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// Accumulate digits until we hit a non-digit
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bool bHasFractionPart = false;
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while ( m_cur < m_end && *m_cur >= '0' && *m_cur <= '9' )
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{
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m_vecTokenChars.AddToTail( *(m_cur++) );
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bHasFractionPart = true;
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}
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// Make sure we aren't just a single '.'
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if ( !bHasWholePart && !bHasFractionPart )
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{
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m_vecTokenChars.AddToTail(0);
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V_sprintf_safe( m_szErrMsg, "Invalid number starting with '%s'", m_vecTokenChars.Base() );
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m_eToken = kToken_Err;
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return;
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}
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}
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// Exponent?
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if ( m_cur < m_end && ( *m_cur == 'e' || *m_cur == 'E' ) )
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{
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m_eToken = kToken_NumberFloat;
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// Eat 'e'
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m_vecTokenChars.AddToTail( *(m_cur++) );
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// Optional sign
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if ( m_cur < m_end && ( *m_cur == '-' || *m_cur == '+' ) )
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m_vecTokenChars.AddToTail( *(m_cur++) );
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// Accumulate digits until we hit a non-digit
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bool bHasExponentDigit = false;
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while ( m_cur < m_end && *m_cur >= '0' && *m_cur <= '9' )
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{
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m_vecTokenChars.AddToTail( *(m_cur++) );
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bHasExponentDigit = true;
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}
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if ( !bHasExponentDigit )
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{
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V_strcpy_safe( m_szErrMsg, "Bad exponent in floating point number" );
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m_eToken = kToken_Err;
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return;
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}
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}
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// OK, We have parsed a valid number.
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// Terminate token
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m_vecTokenChars.AddToTail( '\0' );
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// EOF? That's OK for now, at this lexical parsing level. We'll handle the error
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// at the higher parse level, when expecting a comma or closing delimiter
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if ( m_cur >= m_end )
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return;
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// Is the next thing a valid character? This is the most common case.
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c = *m_cur;
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if ( V_isspace( c ) || c == ',' || c == '}' || c == ']' || c == '/' )
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return;
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// Handle these guys as "tokens", to provide a slightly more meaningful error message
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if ( c == '[' || c == '{' )
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return;
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// Anything else, treat the whole thing as an invalid numerical constant
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if ( V_isprint(c) )
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V_sprintf_safe( m_szErrMsg, "Number contains invalid character 0x%02x ('%c')", (uint8)c, c );
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else
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V_sprintf_safe( m_szErrMsg, "Number contains invalid character 0x%02x", (uint8)c );
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m_eToken = kToken_Err;
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}
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void KeyValuesJSONParser::ParseStringToken()
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{
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char cDelim = *(m_cur++);
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while ( m_cur < m_end )
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{
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char c = *(m_cur++);
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if ( c == '\r' || c == '\n' )
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{
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V_sprintf_safe( m_szErrMsg, "Hit end of line before closing quote (%c)", c );
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m_eToken = kToken_Err;
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return;
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}
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if ( c == cDelim )
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{
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m_eToken = kToken_String;
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|
m_vecTokenChars.AddToTail( '\0' );
|
|
return;
|
|
}
|
|
|
|
// Ordinary character? Just append it
|
|
if ( c != '\\' )
|
|
{
|
|
m_vecTokenChars.AddToTail( c );
|
|
continue;
|
|
}
|
|
|
|
// Escaped character.
|
|
// End of string? We'll handle it above
|
|
if ( m_cur >= m_end )
|
|
continue;
|
|
|
|
// Check table of allowed escape characters
|
|
switch (c)
|
|
{
|
|
case '\\':
|
|
case '/':
|
|
case '\'':
|
|
case '\"': m_vecTokenChars.AddToTail( c ); break;
|
|
case 'b': m_vecTokenChars.AddToTail( '\b' ); break;
|
|
case 'f': m_vecTokenChars.AddToTail( '\f' ); break;
|
|
case 'n': m_vecTokenChars.AddToTail( '\n' ); break;
|
|
case 'r': m_vecTokenChars.AddToTail( '\r' ); break;
|
|
case 't': m_vecTokenChars.AddToTail( '\t' ); break;
|
|
|
|
case 'u':
|
|
{
|
|
|
|
// Make sure are followed by exactly 4 hex digits
|
|
if ( m_cur + 4 > m_end || !V_isxdigit( m_cur[0] ) || !V_isxdigit( m_cur[1] ) || !V_isxdigit( m_cur[2] ) || !V_isxdigit( m_cur[3] ) )
|
|
{
|
|
V_sprintf_safe( m_szErrMsg, "\\u must be followed by exactly 4 hex digits" );
|
|
m_eToken = kToken_Err;
|
|
return;
|
|
}
|
|
|
|
// Parse the codepoint
|
|
uchar32 nCodePoint = 0;
|
|
for ( int n = 0 ; n < 4 ; ++n )
|
|
{
|
|
nCodePoint <<= 4;
|
|
char chHex = *(m_cur++);
|
|
if ( chHex >= '0' && chHex <= '9' )
|
|
nCodePoint += chHex - '0';
|
|
else if ( chHex >= 'a' && chHex <= 'a' )
|
|
nCodePoint += chHex + 0x0a - 'a';
|
|
else if ( chHex >= 'A' && chHex <= 'A' )
|
|
nCodePoint += chHex + 0x0a - 'A';
|
|
else
|
|
Assert( false ); // inconceivable, due to above
|
|
}
|
|
|
|
// Encode it in UTF-8
|
|
char utf8Encode[8];
|
|
int r = Q_UChar32ToUTF8( nCodePoint, utf8Encode );
|
|
if ( r < 0 || r > 4 )
|
|
{
|
|
V_sprintf_safe( m_szErrMsg, "Invalid code point \\u%04x", nCodePoint );
|
|
m_eToken = kToken_Err;
|
|
return;
|
|
}
|
|
for ( int i = 0 ; i < r ; ++i )
|
|
m_vecTokenChars.AddToTail( utf8Encode[i] );
|
|
} break;
|
|
|
|
default:
|
|
if ( V_isprint(c) )
|
|
V_sprintf_safe( m_szErrMsg, "Invalid escape character 0x%02x ('\\%c')", (uint8)c, c );
|
|
else
|
|
V_sprintf_safe( m_szErrMsg, "Invalid escape character 0x%02x", (uint8)c );
|
|
m_eToken = kToken_Err;
|
|
return;
|
|
}
|
|
}
|
|
|
|
V_sprintf_safe( m_szErrMsg, "Hit end of input before closing quote (%c)", cDelim );
|
|
m_eToken = kToken_Err;
|
|
}
|
|
|
|
const char *KeyValuesJSONParser::GetTokenDebugText()
|
|
{
|
|
switch ( m_eToken )
|
|
{
|
|
case kToken_EOF: return "<EOF>";
|
|
case kToken_String: return "<string>";
|
|
case kToken_NumberInt:
|
|
case kToken_NumberFloat: return "<number>";
|
|
case kToken_True: return "'true'";
|
|
case kToken_False: return "'false'";
|
|
case kToken_Null: return "'null'";
|
|
case '{': return "'{'";
|
|
case '}': return "'}'";
|
|
case '[': return "'['";
|
|
case ']': return "']'";
|
|
case ':': return "':'";
|
|
case ',': return "','";
|
|
}
|
|
|
|
// We shouldn't ever need to ask for a debug string for the error token,
|
|
// and anything else is an error
|
|
Assert( false );
|
|
return "<parse error>";
|
|
}
|
|
|
|
#ifdef _DEBUG
|
|
|
|
static void JSONTest_ParseValid( const char *pszData )
|
|
{
|
|
KeyValuesJSONParser parser( pszData );
|
|
KeyValues *pFile = parser.ParseFile();
|
|
Assert( pFile );
|
|
pFile->deleteThis();
|
|
}
|
|
|
|
static void JSONTest_ParseInvalid( const char *pszData, const char *pszExpectedErrMsgSnippet, int nExpectedFailureLine )
|
|
{
|
|
KeyValuesJSONParser parser( pszData );
|
|
KeyValues *pFile = parser.ParseFile();
|
|
Assert( pFile == NULL );
|
|
Assert( V_stristr( parser.m_szErrMsg, pszExpectedErrMsgSnippet ) != NULL );
|
|
Assert( parser.m_nLine == nExpectedFailureLine );
|
|
}
|
|
|
|
void TestKeyValuesJSONParser()
|
|
{
|
|
JSONTest_ParseValid( "{}" );
|
|
JSONTest_ParseValid( R"JSON({
|
|
"key": "string_value",
|
|
"pos_int32": 123,
|
|
"pos_int64": 123456789012,
|
|
"neg_int32": -456,
|
|
"float": -45.23,
|
|
"pos_exponent": 1e30,
|
|
"neg_exponent": 1e-16,
|
|
"decimal_and_exponent": 1.e+30,
|
|
"no_leading_zero": .7, // we support this, even though strict JSON says it's no good
|
|
"zero": 0,
|
|
"true_value": true,
|
|
"false_value": false,
|
|
"null_value": null,
|
|
"with_escaped": "\r \t \n",
|
|
"unicode": "\u1234 \\u12f3",
|
|
"array_of_ints": [ 1, 2, 3, -45 ],
|
|
"empty_array": [],
|
|
"array_with_stuff_inside": [
|
|
{}, // this is a comment.
|
|
[ 0.45, {}, "hello!" ],
|
|
{ "id": 0 },
|
|
// Trailing comma above. Comment here
|
|
],
|
|
})JSON" );
|
|
JSONTest_ParseInvalid( "{ \"key\": 123", "missing", 1 );
|
|
JSONTest_ParseInvalid( "{ \"key\": 123.4f }", "number", 1 );
|
|
}
|
|
|
|
#endif
|