Alert Query Language

This is a simple query language develop inhouse to write custom logic to view and trigger alerts based on the chart technical tools.

Supported techical indicators

ma(close, 5)

• moving average on close price with value 5.
• args: price_type (optional), period, ma_type
• return: none

macd(close, 16, 26, 9).value

• params: price_type, fast_period, slow_period, signal_period
• return: .value, .signal, .divergence

Supported logics

The logics works by combination of the following pattern.

• identifier operator operand extops
  • Identifier = main indicator value.
  • operator = comparison with keyword or symbol.
  • operand = value to compare with identifier.
  • extops = extended operation for time squence or value multiplier.

As long as it fulfil the above logic, you can combo with

• AND / OR logic ... AND ...
• parenthesis (...) OR ... to establish precedence.

Idenfifier

• Mainly consist of things you see from Supported techical indicators

Operator

cross, crossover, crossunder

• Flags when "left" value cross "right" value.
• "right" value can be an indicator or value.
• eg.
  • ma(close, 5) crossover ma(close, 14)
  • macd(close, 16, 26).signal crossunder 0

above, below, eq, lt, gt, =, <, >

• The usual arithmetic for equation to compare value.

Operand

• Same like Identifier or ...
• Number or Percentage

ExtOpts

• Additional behaviour mostly to add additional time comparison or value multiplier.

by

• To apply some multiplier to the operand value.
• eg.
  • ma(close, 5) crossover ma(close, 15) by 5%
  • means that alert will only triggered after ma(5) crosses more than 5% of the ma(15).

for

• To extend the comparison of logic to remain true for X period of time.
• eg.
  • ma(close, 5) was crossover ma(close, 15) for 5t
  • means that upon crossover, alert will be triggered after 5 ticks.

was and for

• To ensure the logic has happened before the alert.
• eg.
  • ma(close, 5) was crossover ma(close, 15) for 5t
  • Noted* "was" need too be coupled together with the "for" keyword.

combination everything was, for and by

• eg. ma(close, 5) was crossover ma(close, 15) by 5% for 5t