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Rewrite env_exists() for better scope handling

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env_exists() wasn't properly handling multiple scopes in some cases,
notably with readonly/electric variables. Rewrite it to operate in a
more straightforward fashion.
This commit is contained in:
Kevin Ballard 2014-07-12 01:15:52 -07:00
parent 383aaa236e
commit 76fdfe6890
1 changed files with 30 additions and 44 deletions
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74
env.cpp
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@ -1009,59 +1009,54 @@ bool env_exist(const wchar_t *key, int mode)
CHECK(key, false);
/*
Read only variables all exist, and they are all global. A local
version can not exist.
*/
if (!(mode & ENV_LOCAL) && !(mode & ENV_UNIVERSAL))
const bool has_scope = mode & (ENV_LOCAL | ENV_GLOBAL | ENV_UNIVERSAL);
const bool test_local = !has_scope || (mode & ENV_LOCAL);
const bool test_global = !has_scope || (mode & ENV_GLOBAL);
const bool test_universal = !has_scope || (mode & ENV_UNIVERSAL);
const bool test_exported = (mode & ENV_EXPORT) || !(mode & ENV_UNEXPORT);
const bool test_unexported = (mode & ENV_UNEXPORT) || !(mode & ENV_EXPORT);
if (is_electric(key))
{
if (is_read_only(key) || is_electric(key))
/*
Electric variables all exist, and they are all global. A local or
universal version can not exist. They are also never exported.
*/
if (test_global && test_unexported)
{
//Such variables are never exported
if (mode & ENV_EXPORT)
{
return false;
}
else if (mode & ENV_UNEXPORT)
{
return true;
}
return true;
}
return false;
}
if (!(mode & ENV_UNIVERSAL))
if (test_local || test_global)
{
env = (mode & ENV_GLOBAL)?global_env:top;
env = test_local ? top : global_env;
while (env != 0)
while (env)
{
var_table_t::iterator result = env->env.find(key);
if (result != env->env.end())
{
const var_entry_t &res = result->second;
if (mode & ENV_EXPORT)
{
return res.exportv;
}
else if (mode & ENV_UNEXPORT)
{
return ! res.exportv;
}
return true;
return res.exportv ? test_exported : test_unexported;
}
if (mode & ENV_LOCAL)
break;
env = env->next_scope_to_search();
if (has_scope)
{
if (!test_global || env == global_env) break;
env = global_env;
}
else
{
env = env->next_scope_to_search();
}
}
}
if (!(mode & ENV_LOCAL) && !(mode & ENV_GLOBAL))
if (test_universal)
{
if (! get_proc_had_barrier())
{
@ -1071,16 +1066,7 @@ bool env_exist(const wchar_t *key, int mode)
if (uvars() && ! uvars()->get(key).missing())
{
if (mode & ENV_EXPORT)
{
return uvars()->get_export(key);
}
else if (mode & ENV_UNEXPORT)
{
return ! uvars()->get_export(key);
}
return 1;
return uvars()->get_export(key) ? test_exported : test_unexported;
}
}