kc3-lang/kc3/libkc3/frame.c

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• Hash : ce8d2282
  Author : Thomas de Grivel
  Date : 2024-09-21T03:07:39
  

  fix closures

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• libkc3/frame.c

• /* kc3
   * Copyright 2022,2023,2024 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include "alloc.h"
  #include "assert.h"
  #include "binding.h"
  #include "frame.h"
  #include "list.h"
  #include "sym.h"
  #include "tag.h"
  
  s_tag * frame_binding_new (s_frame *frame, const s_sym *name)
  {
    s_binding *b;
    b = binding_new(name, frame->bindings);
    if (! b)
      return NULL;
    frame->bindings = b;
    tag_init_var(&b->value, &g_sym_Tag);
    return &b->value;
  }
  
  s_frame * frame_binding_new_copy (s_frame *frame, const s_sym *name,
                                    s_tag *value)
  {
    s_tag *tag;
    frame_binding_new(frame, name);
    tag = binding_get_w(frame->bindings, name);
    if (tag == NULL) {
      err_puts("frame_binding_new_copy: binding new");
      assert(! "frame_binding_new_copy: binding new");
      return NULL;
    }
    if (value->type == TAG_VAR) {
      tag_init_var(tag, value->data.var.type);
      value->data.var.ptr = tag->data.var.ptr;
    }
    else if (! tag_init_copy(tag, value)) {
      err_puts("frame_binding_new_copy: tag_init_copy");
      assert(! "frame_binding_new_copy: tag_init_copy");
      frame = frame_binding_delete(frame, name);
      return NULL;
    }
    return frame;
  }
  
  s_frame * frame_binding_delete (s_frame *frame, const s_sym *name)
  {
    s_binding **b;
    b = binding_find(&frame->bindings, name);
    *b = binding_delete(*b);
    return frame;
  }
  
  s_frame * frame_binding_replace (s_frame *frame, const s_sym *name,
                                   const s_tag *value)
  {
    s_tag *tag;
    tag = binding_get_w(frame->bindings, name);
    if (tag) {
      tag_clean(tag);
      if (! tag_init_copy(tag, value)) {
        err_puts("frame_binding_new_copy: tag_init_copy 1");
        assert(! "frame_binding_new_copy: tag_init_copy 1");
        return NULL;
      }
      return frame;
    }
    frame_binding_new(frame, name);
    tag = binding_get_w(frame->bindings, name);
    if (! tag) {
      err_puts("frame_binding_new_copy: binding new");
      assert(! "frame_binding_new_copy: binding new");
      return NULL;
    }
    if (! tag_init_copy(tag, value)) {
      err_puts("frame_binding_new_copy: tag_init_copy 2");
      assert(! "frame_binding_new_copy: tag_init_copy 2");
      frame = frame_binding_delete(frame, name);
      return NULL;
    }
    return frame;
  }
  
  s_frame * frame_clean (s_frame *frame)
  {
    s_frame *next;
    assert(frame);
    next = frame->next;
    binding_delete_all(frame->bindings);
    if (frame->fn_frame)
      frame_delete_all(frame->fn_frame);
    return next;
  }
  
  s_frame * frame_delete (s_frame *frame)
  {
    s_frame *next = NULL;
    if (frame) {
      next = frame_clean(frame);
      free(frame);
    }
    return next;
  }
  
  void frame_delete_all (s_frame *frame)
  {
    s_frame *f;
    f = frame;
    while (f)
      f = frame_delete(f);
  }
  
  const s_tag * frame_get (const s_frame *frame, const s_sym *sym)
  {
    const s_frame *f;
    const s_tag *result;
    assert(sym);
    f = frame;
    while (f) {
      result = binding_get(f->bindings, sym);
      if (result)
        return result;
      f = f->next;
    }
    f = frame;
    while (f) {
      if (f->fn_frame) {
        result = frame_get(f->fn_frame, sym);
        if (result)
          return result;
      }
      f = f->next;
    }
    return NULL;
  }
  
  s_tag * frame_get_w (s_frame *frame, const s_sym *sym)
  {
    s_frame *f;
    s_tag *result;
    assert(sym);
    f = frame;
    while (f) {
      result = binding_get_w(f->bindings, sym);
      if (result)
        return result;
      f = f->next;
    }
    f = frame;
    while (f) {
      if (f->fn_frame) {
        result = frame_get_w(f->fn_frame, sym);
        if (result)
          return result;
      }
      f = f->next;
    }
    return NULL;
  }
  
  s_frame * frame_init (s_frame *frame, s_frame *next,
                        const s_frame *fn_frame)
  {
    s_frame tmp = {0};
    assert(frame);
    tmp.next = next;
    tmp.fn_frame = frame_new_copy(fn_frame);
    *frame = tmp;
    return frame;
  }
  
  s_frame * frame_new (s_frame *next, const s_frame *fn_frame)
  {
    s_frame *frame;
    frame = alloc(sizeof(s_frame));
    if (! frame)
      return NULL;
    if (! frame_init(frame, next, fn_frame)) {
      free(frame);
      return NULL;
    }
    return frame;
  }
  
  s_frame * frame_new_copy (const s_frame *src)
  {
    s_frame **f;
    s_frame  *frame;
    const s_frame *s;
    frame = NULL;
    f = &frame;
    s = src;
    while (s) {
      *f = frame_new(NULL, s->fn_frame);
      if (s->bindings &&
          ! ((*f)->bindings = binding_new_copy(s->bindings)))
        goto clean;
      f = &(*f)->next;
      s = s->next;
    }
    return frame;
   clean:
    frame_delete_all(frame);
    return NULL;
  }
  
  s_frame * frame_replace (s_frame *frame, const s_sym *sym,
                           s_tag *value)
  {
    s_tag *result;
    assert(sym);
    result = binding_get_w(frame->bindings, sym);
    if (result) {
      tag_clean(result);
      if (value->type == TAG_VAR) {
        tag_init_var(result, value->data.var.type);
        value->data.var.ptr = result->data.var.ptr;
      }
      else
        tag_init_copy(result, value);
      return frame;
    }
    return frame_binding_new_copy(frame, sym, value);
  }
  

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