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SongFilter: implement operator "!=" 

Closes #89
This commit is contained in:
Max Kellermann 2018-07-24 23:24:42 +02:00
parent 5271e81ebe
commit 9263d6d07d
3 changed files with 14 additions and 6 deletions
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2
NEWS
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@ -7,7 +7,7 @@ ver 0.21 (not yet released)
- "outputs" prints the plugin name
- "outputset" sets runtime attributes
- close connection when client sends HTTP request
- new filter syntax for "find"/"search" etc.
- new filter syntax for "find"/"search" etc. with negation
* database
- simple: scan audio formats
* player

4
doc/protocol.xml
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@ -222,6 +222,10 @@
"<code>(TAG == 'VALUE')</code>": match a tag value.
</para>
<para>
"<code>(TAG != 'VALUE')</code>": mismatch a tag value.
</para>
<para>
The special tag "<parameter>any</parameter>" checks all
tag values.

14
src/SongFilter.cxx
View File

@ -81,7 +81,7 @@ SongFilter::Item::ToExpression() const noexcept
{
switch (tag) {
case LOCATE_TAG_FILE_TYPE:
return "(" LOCATE_TAG_FILE_KEY " == \"" + value + "\")";
return std::string("(" LOCATE_TAG_FILE_KEY " ") + (IsNegated() ? "!=" : "==") + " \"" + value + "\")";
case LOCATE_TAG_BASE_TYPE:
return "(base \"" + value + "\")";
@ -90,10 +90,10 @@ SongFilter::Item::ToExpression() const noexcept
return "(modified-since \"" + value + "\")";
case LOCATE_TAG_ANY_TYPE:
return "(" LOCATE_TAG_ANY_KEY " == \"" + value + "\")";
return std::string("(" LOCATE_TAG_ANY_KEY " ") + (IsNegated() ? "!=" : "==") + " \"" + value + "\")";
default:
return std::string("(") + tag_item_names[tag] + " == \"" + value + "\")";
return std::string("(") + tag_item_names[tag] + " " + (IsNegated() ? "!=" : "==") + " \"" + value + "\")";
}
}
@ -317,8 +317,11 @@ SongFilter::ParseExpression(const char *s, bool fold_case)
items.emplace_back(type, std::move(value), fold_case);
return StripLeft(s + 1);
} else {
if (s[0] != '=' || s[1] != '=')
throw std::runtime_error("'==' expected");
bool negated = false;
if (s[0] == '!' && s[1] == '=')
negated = true;
else if (s[0] != '=' || s[1] != '=')
throw std::runtime_error("'==' or '!=' expected");
s = StripLeft(s + 2);
auto value = ExpectQuoted(s);
@ -326,6 +329,7 @@ SongFilter::ParseExpression(const char *s, bool fold_case)
throw std::runtime_error("')' expected");
items.emplace_back(type, std::move(value), fold_case);
items.back().SetNegated(negated);
return StripLeft(s + 1);
}
}