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Lex \x escape sequence

This commit is contained in:
Callum Anderson 2014-03-06 09:47:30 +11:00
parent 3ddac7885f
commit b8093ec269
1 changed files with 40 additions and 1 deletions
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41
stdx/d/lexer.d
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@ -1252,8 +1252,26 @@ public struct DLexer
range.popFront();
break;
case 'x':
// TODO
range.popFront();
foreach (i; 0 .. 2)
{
if (range.empty)
{
error("Error: 2 hex digits expected.");
return false;
}
switch (range.front)
{
case '0': .. case '9':
case 'a': .. case 'f':
case 'A': .. case 'F':
range.popFront();
break;
default:
error("Error: 2 hex digits expected.");
return false;
}
}
break;
case '1': .. case '7':
for (size_t i = 0; i < 3 && !range.empty && range.front >= '0' && range.front <= '7'; i++)
@ -1506,3 +1524,24 @@ unittest
assert (tokens.map!"a.type"().equal([tok!"import", tok!"identifier", tok!".",
tok!"identifier", tok!";"]));
}
/// Test \x char sequence
unittest
{
auto toks = (string s) => byToken(cast(ubyte[])s);
// valid
enum hex = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','A','B','C','D','E','F'];
auto source = "";
foreach(h1; hex)
foreach(h2; hex)
source ~= "'\\x" ~ h1 ~ h2 ~ "'";
assert(toks(source).filter!(t => t.type != tok!"characterLiteral").empty);
// invalid
assert(toks(`'\x'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
assert(toks(`'\x_'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
assert(toks(`'\xA'`).messages[0] == DLexer.Message(1,5,"Error: 2 hex digits expected.",true));
assert(toks(`'\xAY'`).messages[0] == DLexer.Message(1,5,"Error: 2 hex digits expected.",true));
assert(toks(`'\xXX'`).messages[0] == DLexer.Message(1,4,"Error: 2 hex digits expected.",true));
}