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New config parser

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Basically a subset of Bourne shell.
This commit is contained in:
Přemysl Eric Janouch 2018-11-01 22:20:02 +01:00
parent e80c56e249
commit 3624636c2f
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 51 additions and 8 deletions
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59
sdn.cpp
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@ -130,6 +130,51 @@ fun shell_escape (const string &v) -> string {
return "'" + result + "'";
}
fun parse_line (istream &is, vector<string> &out) -> bool {
enum {STA, DEF, COM, ESC, WOR, QUO, STATES};
enum {TAKE = 1 << 3, PUSH = 1 << 4, STOP = 1 << 5, ERROR = 1 << 6};
enum {TWOR = TAKE | WOR};
// We never transition back to the start state, so it can stay as a noop
static char table[STATES][7] = {
// state EOF SP, TAB ' # \ LF default
/* STA */ {ERROR, DEF, QUO, COM, ESC, STOP, TWOR},
/* DEF */ {STOP, 0, QUO, COM, ESC, STOP, TWOR},
/* COM */ {STOP, 0, 0, 0, 0, STOP, 0},
/* ESC */ {ERROR, TWOR, TWOR, TWOR, TWOR, TWOR, TWOR},
/* WOR */ {STOP | PUSH, DEF | PUSH, QUO, TAKE, ESC, STOP | PUSH, TAKE},
/* QUO */ {ERROR, TAKE, WOR, TAKE, TAKE, TAKE, TAKE},
};
out.clear (); string token; int state = STA;
constexpr auto eof = istream::traits_type::eof ();
while (1) {
int ch = is.get (), edge = 0;
switch (ch) {
case eof: edge = table[state][0]; break;
case '\t':
case ' ': edge = table[state][1]; break;
case '\'': edge = table[state][2]; break;
case '#': edge = table[state][3]; break;
case '\\': edge = table[state][4]; break;
case '\n': edge = table[state][5]; break;
default: edge = table[state][6]; break;
}
if (edge & TAKE)
token += ch;
if (edge & PUSH) {
out.push_back (token);
token.clear ();
}
if (edge & STOP)
return true;
if (edge & ERROR)
return false;
if (edge &= 7)
state = edge;
}
}
fun decode_type (mode_t m) -> wchar_t {
if (S_ISDIR (m)) return L'd'; if (S_ISBLK (m)) return L'b';
if (S_ISCHR (m)) return L'c'; if (S_ISLNK (m)) return L'l';
@ -1006,10 +1051,9 @@ fun load_colors () {
if (!config)
return;
string line;
while (getline (*config, line)) {
auto tokens = split (line, " ");
if (tokens.empty () || line.front () == '#')
vector<string> tokens;
while (parse_line (*config, tokens)) {
if (tokens.empty ())
continue;
auto name = shift (tokens);
for (int i = 0; i < g.AT_COUNT; i++)
@ -1105,10 +1149,9 @@ fun load_bindings () {
actions[name] = action (a++);
}
string line;
while (getline (*config, line)) {
auto tokens = split (line, " ");
if (tokens.empty () || line.front () == '#')
vector<string> tokens;
while (parse_line (*config, tokens)) {
if (tokens.empty ())
continue;
if (tokens.size () < 3) {
cerr << "bindings: expected: context binding action";