pcctsast.h

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/* Abstract syntax tree
 *
 * SOFTWARE RIGHTS
 *
 * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
 * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
 * company may do whatever they wish with source code distributed with
 * PCCTS or the code generated by PCCTS, including the incorporation of
 * PCCTS, or its output, into commerical software.
 *
 * We encourage users to develop software with PCCTS.  However, we do ask
 * that credit is given to us for developing PCCTS.  By "credit",
 * we mean that if you incorporate our source code into one of your
 * programs (commercial product, research project, or otherwise) that you
 * acknowledge this fact somewhere in the documentation, research report,
 * etc...  If you like PCCTS and have developed a nice tool with the
 * output, please mention that you developed it using PCCTS.  In
 * addition, we ask that this header remain intact in our source code.
 * As long as these guidelines are kept, we expect to continue enhancing
 * this system and expect to make other tools available as they are
 * completed.
 *
 * ANTLR 1.33
 * Terence Parr
 * Parr Research Corporation
 * with Purdue University and AHPCRC, University of Minnesota
 * 1989-1998
 */

#ifndef PCCTSAST_H
#define PCCTSAST_H

#include "pcctscfg.h"

#include "pccts_stdio.h"
#include "pccts_stdlib.h"

PCCTS_NAMESPACE_STD

//class SList;

#define StringScanMaxText  50
#define MaxTreeStackDepth  400

//
//  7-Apr-97 133MR1  signed int not accepted by AT&T cfront
//
typedef struct stringlexer {
      int c;            // MR1
      char *input;
      char *p;
      char text[StringScanMaxText];
    } StringLexer;

/* Define the structures needed for ast_scan() */
typedef struct stringparser {
      int token;
      StringLexer *lexer;
      int num_labels;
    } StringParser;

typedef struct _scanast {
            struct _scanast *_right, *_down;
            int _token;
      int label_num;
      int type() { return _token; }
      struct _scanast *right() { return _right; }
      struct _scanast *down() { return _down; }
        } ScanAST;

#define VALID_SCAN_TOKEN(t)    (t>=__LPAREN && t<=__PERIOD)

class DllExportPCCTS PCCTS_AST {
protected:
  static const char *scan_token_tbl[];    /* MR20 const */
  enum {
  __LPAREN=1,
  __RPAREN=2,
  __PERCENT=3,
  __INT=4,
  __COLON=5,
  __POUND=6,
  __PERIOD=7,
  __StringScanEOF=-1};

protected:
  const char *scan_token_str(int t);  /* MR20 const */
  void stringlexer_init(StringLexer *scanner, char *input);
  void stringparser_init(StringParser *, StringLexer *);
  ScanAST *stringparser_parse_scanast(char *templ, int *n);
  ScanAST *stringparser_parse_tree(StringParser *parser);
  ScanAST *stringparser_parse_element(StringParser *parser);
  void stringscan_advance(StringLexer *scanner);
  int stringscan_gettok(StringLexer *scanner);
  void _push(PCCTS_AST **st, int *sp, PCCTS_AST *e);
  PCCTS_AST *_pop(PCCTS_AST **st, int *sp);
  int match_partial(PCCTS_AST *t, PCCTS_AST *u);
  int scanmatch(ScanAST *t, PCCTS_AST **labels[], int *n);
  void scanast_free(ScanAST *t);
  ScanAST *new_scanast(int tok);
  void stringparser_match(StringParser *parser, int type);
  virtual PCCTS_AST *deepCopyBushy();

public:
  PCCTS_AST()  {;}
  virtual ~PCCTS_AST() {;}

  /* This group must be defined for SORCERER to work correctly */
  virtual PCCTS_AST *right() = 0;
  virtual PCCTS_AST *down() = 0;
  virtual void setRight(PCCTS_AST *t) = 0;
  virtual void setDown(PCCTS_AST *t) = 0;
// we define these so ANTLR doesn't have to
  virtual int type() { return 0; }
  virtual void setType(int t) {;}
  virtual PCCTS_AST *shallowCopy() {panic("no shallowCopy() defined"); return NULL;}

  /* These are not needed by ANTLR, but are support functions */
  virtual PCCTS_AST *deepCopy();  // used by SORCERER in transform mode
  virtual void addChild(PCCTS_AST *t);
  virtual void lisp_action(FILE *f) {;}
  virtual void lisp(FILE *f);
  static PCCTS_AST *make(PCCTS_AST *rt, ...);
  virtual PCCTS_AST *ast_find_all(PCCTS_AST *u, PCCTS_AST **cursor);
  virtual int match(PCCTS_AST *u);
  virtual void insert_after(PCCTS_AST *b);
  virtual void append(PCCTS_AST *b);
  virtual PCCTS_AST *tail();
  virtual PCCTS_AST *bottom();
  static  PCCTS_AST *cut_between(PCCTS_AST *a, PCCTS_AST *b);
//  virtual SList *to_slist();
  virtual void tfree();
  int ast_scan(char *templ, ...);
  virtual int nsiblings();
  virtual PCCTS_AST *sibling_index(int i);

  void require(int e,const char *err){ if ( !e ) panic(err); } /* MR20 const */
  virtual void panic(const char *err)     // MR20 const
    { fprintf(stderr, "PCCTS_AST: %s\n", err); exit(PCCTS_EXIT_FAILURE); }
};

#endif /* PCCTSAST_H */