Parser for JSON format.

1 files changed, 270 insertions, 0 deletions

diff --git a/src/base/io/ioJson.c b/src/base/io/ioJson.c
new file mode 100644
index 00000000..07c152bc
--- /dev/null
+++ b/src/base/io/ioJson.c
@@ -0,0 +1,270 @@
+/**CFile****************************************************************
+
+  FileName    [ioJson.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Command processing package.]
+
+  Synopsis    [Procedures to read JSON.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: ioJson.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ioAbc.h"
+#include "misc/vec/vecWec.h"
+#include "misc/util/utilNam.h"
+#include "misc/extra/extra.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline int         Json_EntryIsName( int Fan )                     { return Abc_LitIsCompl(Fan);                                                       }
+static inline char *      Json_EntryName( Abc_Nam_t * pStrs, int Fan )    { assert(Json_EntryIsName(Fan));  return Abc_NamStr( pStrs, Abc_Lit2Var(Fan) );     }
+static inline Vec_Int_t * Json_EntryNode( Vec_Wec_t * vObjs, int Fan )    { assert(!Json_EntryIsName(Fan)); return Vec_WecEntry( vObjs, Abc_Lit2Var(Fan) );   }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Parsing.]
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Json_CharIsSpace( char c )   
+{ 
+    return (c == ' ' || c == '\t' || c == '\r' || c == '\n');   
+}
+static inline char * Json_SkipSpaces( char * pCur )
+{
+    while ( Json_CharIsSpace(*pCur) )
+        pCur++;    
+    return pCur;
+}
+static inline char * Json_SkipNonSpaces( char * pCur )
+{
+    while ( !Json_CharIsSpace(*pCur) )
+        pCur++;    
+    return pCur;
+}
+static inline int Json_TokenCompare( char * pCur, char * pNext, char ** ppCur2, char ** ppNext2 )
+{
+//    int i;
+    if ( *pCur == '\"' )
+        pCur++;
+    if ( *(pNext-1) == ',' )
+        pNext--;
+    if ( *(pNext-1) == '\"' )
+        pNext--;
+    *ppCur2 = pCur;
+    *ppNext2 = pNext;
+//    for ( i = 1; i < JSON_NUM_LINES; i++ )
+//        if ( !strncmp( s_Types[i].pName, pCur, pNext - pCur ) )
+//            return i;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes JSON into a file.]
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Json_Write_rec( FILE * pFile, Abc_Nam_t * pStr, Vec_Wec_t * vObjs, Vec_Int_t * vArray, int Level, int fAddComma, int fSpaces )
+{
+    int i, Entry1, Entry2, fComma;
+    if ( Vec_IntEntry(vArray, 0) ) // array
+    {
+        if ( Vec_IntSize(vArray) == 1 )
+            fprintf( pFile, "[]" );
+        else if ( Vec_IntSize(vArray) == 2 && Json_EntryIsName(Vec_IntEntry(vArray,1)) )
+            fprintf( pFile, "[ \"%s\" ]", Json_EntryName(pStr, Vec_IntEntry(vArray,1)) );
+        else
+        {
+            if ( fSpaces )
+                fprintf( pFile, "%*s", 3*(Level-1), "" );
+            fprintf( pFile, "[\n" );
+            Vec_IntForEachEntryStart( vArray, Entry1, i, 1 )
+            {
+                fComma = (i < Vec_IntSize(vArray) - 1);
+                if ( Json_EntryIsName(Entry1) )
+                    fprintf( pFile, "%*s\"%s\"%s\n", 3*Level, "", Json_EntryName(pStr, Entry1), fComma ? ",":"" );
+                else
+                    Json_Write_rec( pFile, pStr, vObjs, Json_EntryNode(vObjs, Entry1), Level+1, fComma, 1 );
+            }
+            fprintf( pFile, "%*s]", 3*(Level-1), "" );
+        }
+        fprintf( pFile, "%s\n", fAddComma ? ",":"" );
+    }
+    else // list of pairs
+    {
+        if ( fSpaces )
+            fprintf( pFile, "%*s", 3*(Level-1), "" );
+        fprintf( pFile, "{\n" );
+        assert( Vec_IntSize(vArray) % 2 != 0 );
+        Vec_IntForEachEntryDoubleStart( vArray, Entry1, Entry2, i, 1 )
+        {
+            fComma = (i < Vec_IntSize(vArray) - 3);
+            if ( Json_EntryIsName(Entry1) )
+                fprintf( pFile, "%*s\"%s\"", 3*Level, "", Json_EntryName(pStr, Entry1) );
+            else
+                Json_Write_rec( pFile, pStr, vObjs, Json_EntryNode(vObjs, Entry1), Level+1, 0, 1 );
+            fprintf( pFile, " : " );
+            if ( Json_EntryIsName(Entry2) )
+                fprintf( pFile, "\"%s\"%s\n", Json_EntryName(pStr, Entry2), fComma ? ",":"" );
+            else
+                Json_Write_rec( pFile, pStr, vObjs, Json_EntryNode(vObjs, Entry2), Level+1, fComma, 0 );
+        }
+        fprintf( pFile, "%*s}%s\n", 3*(Level-1), "", fAddComma ? ",":"" );
+    }
+}
+void Json_Write( char * pFileName, Abc_Nam_t * pStr, Vec_Wec_t * vObjs )
+{
+    FILE * pFile = fopen( pFileName, "wb" );
+    if ( pFile == NULL )
+    {
+        printf( "Cannot open file \"%s\" for writing.\n", pFileName );
+        return;
+    }
+    Json_Write_rec( pFile, pStr, vObjs, Vec_WecEntry(vObjs, 0), 1, 0, 1 );
+    fclose( pFile );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads JSON from a file.]
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Wec_t * Json_Read( char * pFileName, Abc_Nam_t ** ppStrs )
+{
+    Abc_Nam_t * pStrs; 
+    Vec_Wec_t * vObjs; 
+    Vec_Int_t * vStack, * vTemp;
+    char * pContents, * pCur, * pNext, * pCur2, * pNext2;
+    int nFileSize, RetValue, iToken;
+    FILE * pFile;
+
+    // read the file into the buffer
+    pFile = fopen( pFileName, "rb" );
+    if ( pFile == NULL )
+    {
+        printf( "Cannot open file \"%s\" for reading.\n", pFileName );
+        return NULL;
+    }
+    nFileSize = Extra_FileSize( pFileName );
+    pContents = pCur = ABC_ALLOC( char, nFileSize+1 );
+    RetValue = fread( pContents, nFileSize, 1, pFile );
+    pContents[nFileSize] = 0;
+    fclose( pFile );
+
+    // start data-structures
+    vObjs  = Vec_WecAlloc( 1000 );
+    vStack = Vec_IntAlloc( 100 );
+    pStrs  = Abc_NamStart( 1000, 24 );
+    //Json_AddTypes( pStrs );
+
+    // read lines
+    assert( Vec_WecSize(vObjs) == 0 );
+    assert( Vec_IntSize(vStack) == 0 );
+    while ( pCur < pContents + nFileSize )
+    {
+        pCur  = Json_SkipSpaces( pCur );
+        if ( *pCur == '\0' )
+            break;
+        pNext = Json_SkipNonSpaces( pCur );
+        if ( *pCur == '{' || *pCur == '[' )
+        {
+            // add fanin to node on the previous level
+            if ( Vec_IntSize(vStack) > 0 )
+                Vec_IntPush( Vec_WecEntry(vObjs, Vec_IntEntryLast(vStack)), Abc_Var2Lit(Vec_WecSize(vObjs), 0) );            
+            // add node to the stack
+            Vec_IntPush( vStack, Vec_WecSize(vObjs) );
+            vTemp = Vec_WecPushLevel( vObjs );
+            Vec_IntGrow( vTemp, 4 );
+            // remember it as an array
+            Vec_IntPush( vTemp, (int)(*pCur == '[') );
+            pCur++;
+            continue;
+        }
+        if ( *pCur == '}' || *pCur == ']' )
+        {
+            Vec_IntPop( vStack );
+            pCur++;
+            continue;
+        }
+        if ( *pCur == ',' || *pCur == ':' )
+        {
+            pCur++;
+            continue;
+        }
+        iToken = Json_TokenCompare( pCur, pNext, &pCur2, &pNext2 );
+        if ( iToken == 0 )
+            iToken = Abc_NamStrFindOrAddLim( pStrs, pCur2, pNext2, NULL );
+        Vec_IntPush( Vec_WecEntry(vObjs, Vec_IntEntryLast(vStack)), Abc_Var2Lit(iToken, 1) );
+        pCur = pNext;
+    }
+    Vec_IntFree( vStack );
+    ABC_FREE( pContents );
+    *ppStrs = pStrs;
+    return vObjs;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Json_ReadTest( char * pFileName )
+{
+    Abc_Nam_t * pStrs;
+    Vec_Wec_t * vObjs;
+    vObjs = Json_Read( pFileName, &pStrs );
+    if ( vObjs == NULL )
+        return;
+    Json_Write( "test.json", pStrs, vObjs );
+    Abc_NamDeref( pStrs );
+    Vec_WecFree( vObjs );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+