Modifier eval

Function Syntax

float modifier_eval(string expression )

• expression is a mathematical expression to be solved.

Evaluates an expression in the format used by variable modifiers. The following was copied from http://sourceforge.net/p/kolmafia/code/HEAD/tree/src/data/modifiers.txt :

• No spaces are allowed within the expression, except as part of a zone/location name.
• + - * / ( ) have their usual mathematical meaning and precedence.
• ^ is exponentiation, with the highest precedence.
• Functions available:
  • ceil(x) floor(x) sqrt(x) min(x,y) max(x,y) abs(x)
• Location functions: loc(text) zone(text) env(text)
  • These have a value of 1 if the current adventure location, zone, or environment contains the specified text, 0 elsewhere.
• Path function: path(text)
  • This has a value of 1 if the player's path matches the text.
• Familiar function: fam(text)
  • This has a value of 1 if the player's familiar type contains the text, else 0.
• Weapon function: mainhand(text)
  • This has a value of 1 if the player's mainhand weapon class (sword, club, etc.) contains the text.
• Preferences function: pref(text)
  • Returns the value of the specified preference
• function: pref(text,compare)
  • Returns 1 if the specified preference is equal to "compare", otherwise 0
• Effect function: effect(text)
  • This returns the number of turns remaining of the effect uniquely matching text.
• Resistance function: res(text)
  • This returns the number of resistance levels for the listed element
• Class function: class(text)
  • This has a value of 1 if the player's class matches the text.
• Skill function: skill(text)
  • This has a value of 1 if the player has the skill matching the text.
• Upper-case letters are varying values:
  • A - number of Ascensions
  • B - Blood of Wereseal effect
  • C - Clancy's level
  • D - Drunkenness
  • E - active (nonintrinsic) Effects
  • F - Fullness
  • G - Grimace darkness (0..5)
  • H - Hobo Power
  • I - Disco Momentum
  • J - 1 on Festival of Jarlsberg, 0 otherwise
  • K - Smithsness
  • L - player Level
  • M - total Moonlight (0..9)
  • N - AudieNce
  • P - Pasta Thrall level
  • R - Reagent potion duration
  • S - Spleenness
  • T - Turns remaining of this effect
  • U - telescope Upgrades
  • W - familiar Weight
  • X - gender (-1=male, 1=female)
  • Y - furY

• This wrapper allows user-defined variables to be used as well, which must have names starting with a lower-case letter (or underscore) to distinguish them from built-in variables. Variables are supplied as a float[string] map.

 

Code Sample

This script expands modifier_eval() to include support for user-defined variables. It is a bit complex, but it is extremely useful to anyone who wants to use modifier_eval().

float eval(string expr, float[string] vars) {
   buffer b;
   matcher m = create_matcher( "\\b[a-z_][a-zA-Z0-9_]*\\b", expr );
   while (m.find()) {
      string var = m.group(0);
      if (vars contains var) {
         m.append_replacement(b, vars[var].to_string());
      }
      // could implement functions, pref access, etc. here
   }
   m.append_tail(b);
   return modifier_eval(b.to_string());
}

# Everything below this line shows how to make use of eval().
# TESTING:

float[string] v;
v["pi"] = 3.14159265;
v["ten"] = 10;
print(eval("2+3", v));
print(eval("max(pi^ten,ten^pi)", v));
print(eval("sqrt(pi)*L", v));
print(eval("undefined/2", v));