S-expressions: Difference between revisions
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(Updated D entry) |
(Better D entry) |
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=={{header|D}}== |
=={{header|D}}== |
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<lang d>import std.stdio, std.conv, std.algorithm, std.variant, std.uni |
<lang d>import std.stdio, std.conv, std.algorithm, std.variant, std.uni, |
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std.functional; |
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alias Sexp = Variant; |
alias Sexp = Variant; |
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struct Symbol { |
struct Symbol { |
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private string name; |
private string name; |
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string toString() const { return name; } |
string toString() @safe const pure nothrow { return name; } |
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} |
} |
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Sexp parseSexp(string txt) { |
Sexp parseSexp(string txt) @safe pure /*nothrow*/ { |
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static bool isIdentChar(in char c) @safe pure /*nothrow*/ { |
static bool isIdentChar(in char c) @safe pure /*nothrow*/ { |
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return c.isAlpha || "0123456789!@#-".canFind(c); |
return c.isAlpha || "0123456789!@#-".canFind(c); |
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size_t pos = 0; |
size_t pos = 0; |
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Sexp _parse() { |
Sexp _parse() /*nothrow*/ { |
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auto i = pos + 1; |
auto i = pos + 1; |
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scope (exit) |
scope (exit) |
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while (txt[i].isNumber && i < txt.length) |
while (txt[i].isNumber && i < txt.length) |
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i++; |
i++; |
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auto aux = txt[pos .. i]; |
auto aux = txt[pos .. i]; // |
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return aux.parse!double.Sexp; |
return aux.parse!double.Sexp; |
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} |
} |
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auto aux = txt[pos .. i]; |
auto aux = txt[pos .. i]; // |
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return aux.parse!ulong.Sexp; |
return aux.parse!ulong.Sexp; |
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} else if (isIdentChar(txt[pos])) { |
} else if (isIdentChar(txt[pos])) { |
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} |
} |
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txt = txt.find!(not!isWhite); |
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pos++; |
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return _parse; |
return _parse; |
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} |
} |
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"Printed: ".write; |
"Printed: ".write; |
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pTest.writeSexp; |
pTest.writeSexp; |
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writeln; |
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}</lang> |
}</lang> |
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{{out}} |
{{out}} |
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