src/variable.c


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#include "3cl.h"
#include "variable.h"

#include <stdbool.h>
#include <stdlib.h>


struct CCLVariable *ccl_variable_get(struct CCLVariable *vars, char name)
{
    for (struct CCLVariable *var = vars;;var = var->next)
        if (var->name == name)
            return var;
        else if (var->name == '_' || var->next == NULL)
            return NULL;
}

struct CCLVariable *ccl_variable_getany(struct CCL *ccl, struct CCLFrame *frame, char name)
{
    bool root = false;
    struct CCLFrame *curframe;
    struct CCLVariable *found;

    for (curframe = frame; curframe->type != CCL_PROC && curframe->type != CCL_ROOT; curframe = curframe->prev);
    if (curframe->type == CCL_ROOT)
        root = true;

    found = ccl_variable_get(&curframe->vars, name);
    if (!found && !root)
        return ccl_variable_get(&ccl->rootframe.vars, name);

    return NULL;
}

struct CCLVariable *ccl_variable_set(struct CCLVariable *vars, char name, CCLNum value)
{
    struct CCLVariable *toset;
    struct CCLVariable var = (struct CCLVariable)
    {
        .next = NULL,
        .name = name,
        .value = value,
    };

    if (vars->name == '_')
    {
        toset = vars;
        var.prev = NULL;
    } else
    {
        for (toset = vars; toset->next != NULL; toset = toset->next);
        toset->next = (struct CCLVariable *)malloc(sizeof(*toset->next));
        var.prev = toset;
        toset = toset->next;
    }

    *toset = var;
    return toset;
}