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Add return type for transition()

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This commit is contained in:
Josh Holtrop 2023-06-03 20:38:42 -04:00
parent b78827746a
commit 6b0fb4cb12
1 changed files with 39 additions and 6 deletions
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45
assets/parser.d.erb
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@ -411,8 +411,8 @@ class <%= @classname %>
bool lex_continue = false;
if (!decoded.is_eof())
{
uint dest = transition(current_state, decoded.code_point);
if (dest != cast(uint)-1)
auto transition_result = transition(current_state, decoded.code_point);
if (transition_result.found())
{
lex_continue = true;
attempt_match_info.length += decoded.code_point_length;
@ -425,7 +425,7 @@ class <%= @classname %>
{
attempt_match_info.delta_col++;
}
current_state = dest;
current_state = transition_result.destination();
if (states[current_state].accepts())
{
attempt_match_info.accepting_state = &states[current_state];
@ -446,7 +446,39 @@ class <%= @classname %>
}
}
private uint transition(uint current_state, uint code_point)
/**
* Result type for transition().
*
* Alternatives:
* - found(destination)
* - not_found
*/
struct TransitionResult
{
private uint m_destination;
static TransitionResult found(uint destination)
{
return TransitionResult(destination);
}
static TransitionResult not_found()
{
return TransitionResult(cast(uint)-1);
}
bool found()
{
return m_destination != cast(uint)-1;
}
@property uint destination()
{
return m_destination;
}
}
private TransitionResult transition(uint current_state, uint code_point)
{
uint transition_table_index = states[current_state].transition_table_index;
for (uint i = 0u; i < states[current_state].n_transitions; i++)
@ -454,10 +486,11 @@ class <%= @classname %>
if ((transitions[transition_table_index + i].first <= code_point) &&
(code_point <= transitions[transition_table_index + i].last))
{
return transitions[transition_table_index + i].destination;
uint destination = transitions[transition_table_index + i].destination;
return TransitionResult.found(destination);
}
}
return cast(uint)-1;
return TransitionResult.not_found();
}
}