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input: move action parsing to dedicating Action.parse

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This commit is contained in:
Mitchell Hashimoto
2023-08-30 21:39:25 -07:00
parent 3352cae3f7
commit 17e46bf0f4
1 changed files with 71 additions and 67 deletions
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138
src/input/Binding.zig
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@ -82,72 +82,7 @@ pub fn parse(input: []const u8) !Binding {
};
// Find a matching action
const action: Action = action: {
// Split our action by colon. A colon may not exist for some
// actions so it is optional. The part preceding the colon is the
// action name.
const actionRaw = input[eqlIdx + 1 ..];
const colonIdx = std.mem.indexOf(u8, actionRaw, ":");
const action = actionRaw[0..(colonIdx orelse actionRaw.len)];
// An action name is always required
if (action.len == 0) return Error.InvalidFormat;
const actionInfo = @typeInfo(Action).Union;
inline for (actionInfo.fields) |field| {
if (std.mem.eql(u8, action, field.name)) {
// If the field type is void we expect no value
switch (field.type) {
void => {
if (colonIdx != null) return Error.InvalidFormat;
break :action @unionInit(Action, field.name, {});
},
[]const u8 => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = actionRaw[idx + 1 ..];
break :action @unionInit(Action, field.name, param);
},
// Cursor keys can't be set currently
Action.CursorKey => return Error.InvalidAction,
else => switch (@typeInfo(field.type)) {
.Enum => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = actionRaw[idx + 1 ..];
const value = std.meta.stringToEnum(
field.type,
param,
) orelse return Error.InvalidFormat;
break :action @unionInit(Action, field.name, value);
},
.Int => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = actionRaw[idx + 1 ..];
const value = std.fmt.parseInt(field.type, param, 10) catch
return Error.InvalidFormat;
break :action @unionInit(Action, field.name, value);
},
.Float => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = actionRaw[idx + 1 ..];
const value = std.fmt.parseFloat(field.type, param) catch
return Error.InvalidFormat;
break :action @unionInit(Action, field.name, value);
},
else => unreachable,
},
}
}
}
return Error.InvalidFormat;
};
const action = try Action.parse(input[eqlIdx + 1 ..]);
return Binding{ .trigger = trigger, .action = action };
}
@ -266,6 +201,75 @@ pub const Action = union(enum) {
bottom,
right,
};
/// Parse an action in the format of "key=value" where key is the
/// action name and value is the action parameter. The parameter
/// is optional depending on the action.
pub fn parse(input: []const u8) !Action {
// Split our action by colon. A colon may not exist for some
// actions so it is optional. The part preceding the colon is the
// action name.
const colonIdx = std.mem.indexOf(u8, input, ":");
const action = input[0..(colonIdx orelse input.len)];
// An action name is always required
if (action.len == 0) return Error.InvalidFormat;
const actionInfo = @typeInfo(Action).Union;
inline for (actionInfo.fields) |field| {
if (std.mem.eql(u8, action, field.name)) {
// If the field type is void we expect no value
switch (field.type) {
void => {
if (colonIdx != null) return Error.InvalidFormat;
return @unionInit(Action, field.name, {});
},
[]const u8 => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = input[idx + 1 ..];
return @unionInit(Action, field.name, param);
},
// Cursor keys can't be set currently
Action.CursorKey => return Error.InvalidAction,
else => switch (@typeInfo(field.type)) {
.Enum => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = input[idx + 1 ..];
const value = std.meta.stringToEnum(
field.type,
param,
) orelse return Error.InvalidFormat;
return @unionInit(Action, field.name, value);
},
.Int => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = input[idx + 1 ..];
const value = std.fmt.parseInt(field.type, param, 10) catch
return Error.InvalidFormat;
return @unionInit(Action, field.name, value);
},
.Float => {
const idx = colonIdx orelse return Error.InvalidFormat;
const param = input[idx + 1 ..];
const value = std.fmt.parseFloat(field.type, param) catch
return Error.InvalidFormat;
return @unionInit(Action, field.name, value);
},
else => unreachable,
},
}
}
}
return Error.InvalidAction;
}
};
// A key for the C API to execute an action. This must be kept in sync
@ -427,7 +431,7 @@ test "parse: action invalid" {
const testing = std.testing;
// invalid action
try testing.expectError(Error.InvalidFormat, parse("a=nopenopenope"));
try testing.expectError(Error.InvalidAction, parse("a=nopenopenope"));
}
test "parse: action no parameters" {