expando.c

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#include "config.h"
#include <stdbool.h>
#include <stddef.h>
#include "mutt/lib.h"
#include "expando.h"
#include "node.h"
#include "node_container.h"
#include "node_padding.h"
#include "node_text.h"
#include "parse.h"
#include "render.h"
 
struct ExpandoDefinition;

struct Expando *expando_new(const char *format)
{
  struct Expando *exp = MUTT_MEM_CALLOC(1, struct Expando);
  exp->string = mutt_str_dup(format);
  exp->node = node_container_new();
  return exp;
}

void expando_free(struct Expando **ptr)
{
  if (!ptr || !*ptr)
    return;
 
  struct Expando *exp = *ptr;
 
  node_free(&exp->node);
  FREE(&exp->string);
 
  FREE(ptr);
}

static const struct ExpandoNode *node_find(const struct ExpandoNode *node, int did, int uid)
{
  if (!node)
    return NULL;
 
  if ((node->did == did) && (node->uid == uid))
    return node;
 
  struct ExpandoNode **np = NULL;
  ARRAY_FOREACH(np, &node->children)
  {
    const struct ExpandoNode *match = node_find(*np, did, uid);
    if (match)
      return match;
  }
 
  return NULL;
}

const struct ExpandoNode *expando_find_node(const struct Expando *exp, int did, int uid)
{
  if (!exp)
    return NULL;
 
  return node_find(exp->node, did, uid);
}

struct Expando *expando_parse(const char *str, const struct ExpandoDefinition *defs,
                              struct Buffer *err)
{
  if (!str || (*str == '\0') || !defs)
    return NULL;
 
  struct Expando *exp = expando_new(str);
 
  struct ExpandoParseError error = { 0 };
 
  const char *parsed_until = NULL;
  node_parse_many(exp->node, str, NTE_NONE, defs, &parsed_until, &error);
 
  if (error.position)
  {
    buf_strcpy(err, error.message);
    expando_free(&exp);
    return NULL;
  }
 
  // Optimise the tree layout
  node_padding_repad(&exp->node);
  node_container_collapse_all(&exp->node);
 
  return exp;
}

int expando_render(const struct Expando *exp, const struct ExpandoRenderCallback *erc,
                   void *data, MuttFormatFlags flags, int max_cols, struct Buffer *buf)
{
  if (!exp || !exp->node || !erc)
    return 0;
 
  // Give enough space for a long command line
  if (max_cols == -1)
    max_cols = 8192;
 
  return node_render(exp->node, erc, buf, max_cols, data, flags);
}

bool expando_equal(const struct Expando *a, const struct Expando *b)
{
  if (!a && !b) /* both empty */
    return true;
  if (!a ^ !b) /* one is empty, but not the other */
    return false;
 
  return mutt_str_equal(a->string, b->string);
}