some notes

packages/core/fraction.mjs

@@ -4,9 +4,87 @@ Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/st
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-import Fraction from 'fraction.js';
+// import Fraction from 'fraction.js';
 import { TimeSpan } from './timespan.mjs';
 
+let instances = 0;
+let strings = 0;
+let fractions = 0;
+let numbers = 0;
+setInterval(() => {
+  console.log(`${instances} calls = ${numbers} numbers + ${fractions} fractions + ${strings} strings`);
+  instances = 0;
+  strings = 0;
+  fractions = 0;
+  numbers = 0;
+}, 1000);
+
+// http://localhost:3000/#c3RhY2soCiAgImUzLGJiMyxkNCIuc3RydWN0KCJ4KDMsOCwtMSkiKS5vZmYoMS84LHg9PngudHJhbnNwb3NlKDEyKS52ZWxvY2l0eSguMikpLAogICJjMiIuc3RydWN0KCJ4KDQsOCwtMikiKSwKICAiYzMiLnN0cnVjdCgieCgzLDgsLTIpIi5mYXN0KDIpKQopLnNsb3coMikKIC5lY2hvKDQsLjEyNSwuOCkKIC52ZWxvY2l0eShzaW5lLnN0cnVjdCgieCo4IikuYWRkKDMvNSkubXVsKDIvNSkuZmFzdCg4KSkKIC8vIC5waWFub3JvbGwoKQovLyBzdHJ1ZGVsIGRpc2FibGUtaGlnaGxpZ2h0aW5n
+// ~400k/s
+
+// this is a "mock" for fraction.js, using just floats without any rational arithmetic
+// to test if the performance gets better without fraction.js
+// result: it seems to get better but not by much
+// the main jankyness remains for some complicated patterns
+
+class Fraction {
+  value; // number
+  constructor(value) {
+    instances++;
+    if (value instanceof Fraction) {
+      // TODO: return this?
+      this.value = value.value;
+      fractions++;
+    } else if (typeof value === 'string') {
+      const [n, d] = value.split('/');
+      this.value = n / (d || 1);
+      strings++;
+    } else if (typeof value !== 'number' || isNaN(value)) {
+      console.warn('Fraction got NaN', value);
+    } else {
+      numbers++;
+      this.value = Number(value);
+      if (isNaN(this.value)) {
+        console.warn('Fraction parsed NaN from', value);
+      }
+    }
+  }
+  add(other) {
+    return new Fraction(this.value + other);
+  }
+  sub(other) {
+    return new Fraction(this.value - other);
+  }
+  mul(other) {
+    return new Fraction(this.value * other);
+  }
+  div(other) {
+    return new Fraction(this.value / other);
+  }
+  toString() {
+    return this.value + '';
+  }
+  valueOf() {
+    return this.value;
+  }
+  floor() {
+    return new Fraction(Math.floor(this.value));
+  }
+  abs() {
+    return new Fraction(Math.abs(this.value));
+  }
+  inverse() {
+    return new Fraction(1 / this.value);
+  }
+  compare(other) {
+    return this.value - other;
+  }
+  equals(other) {
+    return this.value.valueOf() === other.valueOf();
+  }
+  // TODO: toFraction
+}
+
 // Returns the start of the cycle.
 Fraction.prototype.sam = function () {
   return this.floor();
@@ -14,12 +92,16 @@ Fraction.prototype.sam = function () {
 
 // Returns the start of the next cycle.
 Fraction.prototype.nextSam = function () {
+  // return new Fraction(Math.floor(this.value) + 1);
   return this.sam().add(1);
 };
 
 // Returns a TimeSpan representing the begin and end of the Time value's cycle
 Fraction.prototype.wholeCycle = function () {
   return new TimeSpan(this.sam(), this.nextSam());
+  /*   const begin = Math.floor(this.value);
+  const end = begin + 1;
+  return new TimeSpan(begin, end); */
 };
 
 // The position of a time value relative to the start of its cycle.
@@ -63,20 +145,20 @@ Fraction.prototype.or = function (other) {
   return this.eq(0) ? other : this;
 };
 
-const fraction = (n) => {
+/* const fraction = (n) => {
   if (typeof n === 'number') {
-    /*
-    https://github.com/infusion/Fraction.js/#doubles
-    „If you pass a double as it is, Fraction.js will perform a number analysis based on Farey Sequences."
-    „If you want to keep the number as it is, convert it to a string, as the string parser will not perform any further observations“
+    // https://github.com/infusion/Fraction.js/#doubles
+    // „If you pass a double as it is, Fraction.js will perform a number analysis based on Farey Sequences."
+    // „If you want to keep the number as it is, convert it to a string, as the string parser will not perform any further observations“
     
-    -> those farey sequences turn out to make pattern querying ~20 times slower! always use strings!
-    -> still, some optimizations could be done: .mul .div .add .sub calls still use numbers
-    */
+    // -> those farey sequences turn out to make pattern querying ~20 times slower! always use strings!
+    // -> still, some optimizations could be done: .mul .div .add .sub calls still use numbers
     n = String(n);
   }
   return Fraction(n);
-};
+}; */
+
+const fraction = (n) => new Fraction(n);
 
 export const gcd = (...fractions) => {
   return fractions.reduce((gcd, fraction) => gcd.gcd(fraction), fraction(1));

packages/eval/shapeshifter.mjs

@@ -89,7 +89,7 @@ export default (_code) => {
 
       const isMarkable = isPatternArg(parents) || hasModifierCall(parent);
       // add to location to pure(x) calls
-      if (node.type === 'CallExpression' && node.callee.name === 'pure') {
+      if (addLocations && node.type === 'CallExpression' && node.callee.name === 'pure') {
         const literal = node.arguments[0];
         // const value = literal[{ LiteralNumericExpression: 'value', LiteralStringExpression: 'name' }[literal.type]];
         return reifyWithLocation(literal, node.arguments[0], ast.locations, artificialNodes);

study.md

@@ -0,0 +1,61 @@
+# study: why are there so many calls?
+
+- `pure('c3')` => 746 calls per second...
+- shapeshifted: `(async()=>{return reify("c3").withLocation([1,5,20],[1,9,24])})()`Ï => same # of calls with or without shapeshifting
+- without highlighting (// strudel disable-highlighting), there are only 15 calls
+
+## call stack
+
+this is how the ~15 calls are made for the first query:
+
+- keypress -> activateCode -> evaluate -> safeEval -> pure -> new Pattern (pretty simple)
+- query 0
+  - const timespan = new TimeSpan(0,1)
+    - Fraction(0), Fraction(1)
+  - onQuery(new State(timespan))
+    - pattern.query(state)
+      - pure.query(state)
+        - state.span.spanCycles
+          - end.sam() -> this.floor -> new Fraction
+          - begin.sam -> this.floor -> new Fraction
+          - begin.nextSam
+            - begin.sam -> this.floor -> new Fraction
+            - .add(1) -> new Fraction
+        - Fraction(0).wholeCycle -> new TimeSpan(0, 1)
+          - this.sam -> new Fraction(0)
+          - this.nextSam -> new Fraction(1)
+        - new Hap(TimeSpan(0,1), TimeSpan(0,1), 'c3')
+  - Tone.getTransport().cancel(0);
+  - queryNextTime = 0.5
+  - t = 0.6
+
+## from simple to complicated
+
+(all without highlighting)
+
+- `pure('c3')`: 15 calls
+- `pure('c3').fast(1)`: 74 calls
+- `pure('c3').fast(1).fast(1)`: 133 calls
+- `pure('c3').fast(1).fast(1).fast(1)`: 192 calls
+- `pure('c3').fast(1).fast(1).fast(1).fast(1)`: 251 calls
+- `pure('c3').fast(1).fast(1).fast(1).fast(1).fast(1)`: 310 calls
+- `pure('c3').fast(2)`: 94 calls
+- `pure('c3').fast(2).fast(2)`: 264 calls
+- `pure('c3').fast(2).fast(2).fast(2)`: 636 calls
+- `pure('c3').fast(4)`: 134 calls
+
+## WIL
+
+- Fraction.wholeCycle: returns a timespan for the whole cycle the given fraction is in. Fraction(n).wholeCycle -> TimeSpan(n.floor, n.floor+1)
+  - e.g. `Fraction(0.5).wholeCycle` -> `TimeSpan(0, 1)`
+- TimeSpan.spanCycles: returns an array of whole cycle timespans that intersect with the given timespan
+  - e.g. `TimeSpan(0.5, 1.5)` -> `[TimeSpan(0, 1), TimeSpan(1, 2)]`
+- pure: returns one Hap for spanCycles of query span. Hap will get wholeCycle as whole and query span as part
+- reify: turns non patterns into patterns using pure. makes sure you get a pattern
+
+## notes
+
+- slowcat -> sequence -> fastcat -> slowcat is a somewhat hidden recursion
+- slowcat -> pat_n can be negative and will then return an empty array. is that good? shouldn't pat_n be always a positive index?
+- slowcat offset: how to think about this?
+- slowcat: why add offset and sub it from the query span?