Class: RemLint::Rules::SystemVariableAssignment

Inherits:
RemLint::Rule show all
Defined in:
lib/remlint/rules/system_variable_assignment.rb

Overview

SET on a system variable that will not take it.

Remind's table marks each variable modifiable or not and, for the integer ones, carries the range it will accept (src/var.c SysVarArr). Writing to a read-only variable is E_CANT_MODIFY; writing out of range is E_2LOW/E_2HIGH. Both are decidable from the line alone whenever the value is a literal, which is how these variables are almost always set:

SET $CalMode 1          $CalMode reports the mode, it does not set it
SET $FormWidth 10       Remind accepts 20 to 500

A computed value (SET $FormWidth columns()) is left alone: the rule cannot know what it evaluates to, and guessing would be worse than silence.

Constant Summary collapse

ASSIGNMENT =

SET $Name value -- and UNSET $Name, which is the same permission question with no value attached.

/\A(?<sigil>\$)(?<name>\w+)\s*(?<value>.*)\z/m
INTEGER = 
/\A[+-]?\d+\z/

Constants inherited from RemLint::Rule

RemLint::Rule::REGISTRY

Instance Attribute Summary

Attributes inherited from RemLint::Rule

#config, #document, #offenses

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from RemLint::Rule

all, enabled_by_default?, find, inherited, #initialize, rule_name, #rule_name, #run

Constructor Details

This class inherits a constructor from RemLint::Rule

Class Method Details

.default_severity ⇒ Object 



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# File 'lib/remlint/rules/system_variable_assignment.rb', line 29

def self.default_severity
  "error"
end

.description ⇒ Object 



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# File 'lib/remlint/rules/system_variable_assignment.rb', line 33

def self.description
  "SET on a read-only system variable, or with a value outside its range."
end

Instance Method Details

#check ⇒ Object 



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# File 'lib/remlint/rules/system_variable_assignment.rb', line 37

def check
  document.code_commands.each do |command|
    if command.keyword?("SET", "UNSET")
      check_assignment(command)
    end
  end
end