1 files changed, 132 insertions, 0 deletions
diff --git a/jam-files/engine/parse.c b/jam-files/engine/parse.c
new file mode 100644
index 00000000..9114fa05
--- /dev/null
+++ b/jam-files/engine/parse.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright 1993, 2000 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*  This file is ALSO:
+ *  Copyright 2001-2004 David Abrahams.
+ *  Distributed under the Boost Software License, Version 1.0.
+ *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#include "jam.h"
+#include "lists.h"
+#include "parse.h"
+#include "scan.h"
+#include "newstr.h"
+#include "modules.h"
+#include "frames.h"
+
+/*
+ * parse.c - make and destroy parse trees as driven by the parser
+ *
+ * 09/07/00 (seiwald) - ref count on PARSE to avoid freeing when used,
+ *      as per Matt Armstrong.
+ * 09/11/00 (seiwald) - structure reworked to reflect that (*func)()
+ *      returns a LIST *.
+ */
+
+static PARSE * yypsave;
+
+void parse_file( char * f, FRAME * frame )
+{
+    /* Suspend scan of current file and push this new file in the stream. */
+    yyfparse( f );
+
+    /* Now parse each block of rules and execute it. Execute it outside of the
+     * parser so that recursive calls to yyrun() work (no recursive yyparse's).
+     */
+
+    for ( ; ; )
+    {
+        PARSE * p;
+
+        /* Filled by yyparse() calling parse_save(). */
+        yypsave = 0;
+
+        /* If parse error or empty parse, outta here. */
+        if ( yyparse() || !( p = yypsave ) )
+            break;
+
+        /* Run the parse tree. */
+        parse_evaluate( p, frame );
+        parse_free( p );
+    }
+}
+
+
+void parse_save( PARSE * p )
+{
+    yypsave = p;
+}
+
+
+PARSE * parse_make(
+    LIST  * (* func)( PARSE *, FRAME * ),
+    PARSE * left,
+    PARSE * right,
+    PARSE * third,
+    char  * string,
+    char  * string1,
+    int     num )
+{
+    PARSE * p = (PARSE *)BJAM_MALLOC( sizeof( PARSE ) );
+
+    p->func = func;
+    p->left = left;
+    p->right = right;
+    p->third = third;
+    p->string = string;
+    p->string1 = string1;
+    p->num = num;
+    p->refs = 1;
+    p->rulename = 0;
+
+    if ( left )
+    {
+        p->file = left->file;
+        p->line = left->line;
+    }
+    else
+    {
+        yyinput_stream( &p->file, &p->line );
+    }
+
+    return p;
+}
+
+
+void parse_refer( PARSE * p )
+{
+    ++p->refs;
+}
+
+
+void parse_free( PARSE * p )
+{
+    if ( --p->refs )
+        return;
+
+    if ( p->string )
+        freestr( p->string );
+    if ( p->string1 )
+        freestr( p->string1 );
+    if ( p->left )
+        parse_free( p->left );
+    if ( p->right )
+        parse_free( p->right );
+    if ( p->third )
+        parse_free( p->third );
+    if ( p->rulename )
+        freestr( p->rulename );
+
+    BJAM_FREE( (char *)p );
+}
+
+
+LIST * parse_evaluate( PARSE * p, FRAME * frame )
+{
+    frame->procedure = p;
+    return (*p->func)( p, frame );
+}