josh/propane
1
0
Fork 0
Code Issues 3 Pull Requests Projects Releases Wiki Activity

Complete Lexer.lex_token()

Browse Source
This commit is contained in:
Josh Holtrop 2021-07-05 22:41:09 -04:00
parent f2563cf255
commit 2121acc87e
1 changed files with 48 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
assets/parser.d.erb
View File

@ -161,8 +161,16 @@ class <%= classname %>
LexedToken lex_token()
{
LexedToken lt = LexedToken(m_input_row, m_input_col, TOKEN_NONE);
size_t token_length;
size_t token_attempt_length;
struct LexedTokenState
{
size_t length;
size_t delta_row;
size_t delta_col;
uint token;
}
LexedTokenState last_accepts_info;
last_accepts_info.token = TOKEN_NONE;
LexedTokenState attempt_info;
uint current_state;
for (;;)
{
@ -177,6 +185,44 @@ class <%= classname %>
if (code_point != Decoder.CODE_POINT_EOF)
{
uint dest = transition(current_state, code_point);
if (dest != cast(uint)-1)
{
lex_continue = true;
attempt_info.length += code_point_length;
if (code_point == '\n')
{
attempt_info.delta_row++;
attempt_info.delta_col = 0u;
}
else
{
attempt_info.delta_col++;
}
current_state = dest;
if (states[current_state].accepts != TOKEN_NONE)
{
attempt_info.token = states[current_state].accepts;
last_accepts_info = attempt_info;
}
}
}
if (!lex_continue)
{
if (last_accepts_info.token != TOKEN_NONE)
{
lt.token = last_accepts_info.token;
m_input_position += last_accepts_info.length;
m_input_row += last_accepts_info.delta_row;
if (last_accepts_info.delta_row != 0u)
{
m_input_col = last_accepts_info.delta_col;
}
else
{
m_input_col += last_accepts_info.delta_col;
}
}
break;
}
}
return lt;