`promql.parseSeriesDesc` does not parse negative values

[kevinjqiu]

Bug Report

What did you do?

I'm building a tool that piggy-backs on the promql's testing facility to allow custom test cases for alert rules to be generated from a user defined yaml file.

However, it appears that promql.parseSeriesDesc function does not parse negative values correctly, e.g.,

parseSeriesDesc("my_metric{a=\"b\"} 1 -1") - I expect to see the parsed values to be [1, -1], however, it throws a parser error:

could not parse: parse error at char 22: unexpected end of input in series values, expected "x"

If the negative value appears first in the list, the series can be correctly parsed:

parseSeriesDesc("my_metric{a=\"b\"} -1 1) <- this parses correctly.

I have written a test case that demonstrated this parser error, and here's the test output:

=== RUN   TestParseSeries
--- FAIL: TestParseSeries (0.00s)
	parse_test.go:1778: error in input: 
		
		my_metric{a="b"} 1 -1
	parse_test.go:1779: could not parse: parse error at char 22: unexpected end of input in series values, expected "x"
FAIL

EDIT: Add link to the test code that demonstrate this bug

[codesome]

Adding to above description, this happens not only for -, but also for +. '1 +1' would also error out.

Basically for - or +, the parser is expecting notation like 1 -1x3, 1 +1x4 (except for the first number).

[lock]

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