javacc-7.0.1.examples.JJTreeExamples.cpp.eg4.JJTParserState.cc Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of javacc Show documentation
JavaCC is a parser/scanner generator for Java.
There is a newer version: 7.0.13
/* Generated By:JavaCC: Do not edit this line. JJTParserState.cc Version 7.0 */
/* JavaCCOptions: */
#include "JJTParserState.h"
#include "Node.h"

namespace EG4 {

#define FIXUP_MARKS \
  if (marks->size() > 0) {\
    mk = marks->back();\
    marks->resize(marks->size()-1);\
  }

  JJTParserState::JJTParserState() {
    nodes = new std::vector();
    marks = new std::vector();
    open_nodes = new std::set();
    sp = 0;
    mk = 0;
  }

  /* Determines whether the current node was actually closed and
     pushed.  This should only be called in the final user action of a
     node scope.  */
  bool JJTParserState::nodeCreated() {
    return node_created;
  }

  /* Call this to reinitialize the node stack.  It is called
     automatically by the parser's ReInit() method. */
  void JJTParserState::reset() {
    clear();
    nodes->resize(0);
    marks->resize(0);
    sp = 0;
    mk = 0;
  }

  /* Returns the root node of the AST.  It only makes sense to call
     this after a successful parse. */
  Node *JJTParserState::rootNode() {
    return nodes->at(0);
  }

  /* Pushes a node on to the stack. */
  void JJTParserState::pushNode(Node *n) {
    nodes->push_back(n);
    ++sp;
  }

  /* Returns the node on the top of the stack, and remove it from the
     stack.  */
  Node *JJTParserState::popNode() {
    if (--sp < mk) {
      FIXUP_MARKS;
    }
    Node *ret = nodes->back();
    nodes->resize(nodes->size()-1);
    return ret;
  }

  /* Returns the node currently on the top of the stack. */
  Node *JJTParserState::peekNode() {
    return nodes->size() == 0 ? nullptr : nodes->back();
  }

  /* Returns the number of children on the stack in the current node
     scope. */
  int JJTParserState::nodeArity() {
    return sp - mk;
  }


  void JJTParserState::clearNodeScope(Node *n) {
    while (sp > mk) {
      delete popNode();
    }
    FIXUP_MARKS;
  }


  void JJTParserState::openNodeScope(Node *n) {
    marks->push_back(mk);
    mk = sp;
    n->jjtOpen();
    open_nodes->insert(n);
  }


  /* A definite node is constructed from a specified number of
     children.  That number of nodes are popped from the stack and
     made the children of the definite node.  Then the definite node
     is pushed on to the stack. */
  void JJTParserState::closeNodeScope(Node *n, unsigned int num) {
    open_nodes->erase(n);
    FIXUP_MARKS;
    if (nodes->size() < num) {
      node_created = false;
      delete n;
      return;
    }
    while (num-- > 0) {
      Node *c = popNode();
      c->jjtSetParent(n);
      n->jjtAddChild(c, num);
    }
    n->jjtClose();
    pushNode(n);
    node_created = true;
  }


  /* A conditional node is constructed if its condition is true.  All
     the nodes that have been pushed since the node was opened are
     made children of the conditional node, which is then pushed
     on to the stack.  If the condition is false the node is not
     constructed and they are left on the stack. */
  void JJTParserState::closeNodeScope(Node *n, bool condition) {
    open_nodes->erase(n);
    if (condition) {
      unsigned int a = nodeArity();
      FIXUP_MARKS;
      if (nodes->size() < a) {
        delete n;
        node_created = false;
        return;
      }
      while (a-- > 0) {
        Node *c = popNode();
        c->jjtSetParent(n);
        n->jjtAddChild(c, a);
      }
      n->jjtClose();
      pushNode(n);
      node_created = true;
    } else {
      FIXUP_MARKS;
      node_created = false;
      delete n;
    }
  }

  JJTParserState::~JJTParserState() {
    clear();
    delete open_nodes;
    delete nodes;
    delete marks;
  }

  void JJTParserState::clear() {
    for (size_t i = 0; i < nodes->size(); i++) {
      Node* node = nodes->at(i);
      open_nodes->erase(node);
      delete node;
    }
    for (std::set::iterator it = open_nodes->begin();
         it != open_nodes->end(); it++) 
      delete (*it);  
  }

}
/* JavaCC - OriginalChecksum=7c2c3f2d8b3c716aa4255111311a9aa2 (do not edit this line) */