Implement repeat

3 files changed, 17 insertions, 0 deletions

diff --git a/src/dice.js b/src/dice.js
index d47455e..5a484b0 100644
--- a/src/dice.js
+++ b/src/dice.js
@@ -193,6 +193,19 @@ const thresholdLow = (die1, die2) => {
   return threshold(lessThanOrEqual, die1, die2)
 }
 
+const repeat = (die1, die2) => {
+  return () => {
+    const times = roll(die2)
+
+    let results = []
+    for (let i = 0; i < times; i++) {
+      results = results.concat(die1())
+    }
+
+    return results
+  }
+}
+
 exports.pool = pool
 exports.roll = roll
 exports.constant = constant
@@ -212,3 +225,4 @@ exports.againAbove = againAbove
 exports.againUnder = againUnder
 exports.thresholdHigh = thresholdHigh
 exports.thresholdLow = thresholdLow
+exports.repeat = repeat
diff --git a/src/lexer.js b/src/lexer.js
index 59fba16..248a9b2 100644
--- a/src/lexer.js
+++ b/src/lexer.js
@@ -32,6 +32,7 @@ newLexemeType('A', 'A')
 newLexemeType('a', 'a')
 newLexemeType('T', 'T')
 newLexemeType('t', 't')
+newLexemeType(' x ', ' x ')
 
 const lex = (expressionString) => {
   let lexemes = []
diff --git a/src/parser.js b/src/parser.js
index fd0fd59..b1f6ebb 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -82,6 +82,8 @@ newSymbol('minus', (parser) => {
   }
 })
 
+newInfix(' x ', 24, { type: 'repeat' })
+
 newSymbol('end', null, -1)
 
 const newParser = (tokens) => {