Use period as prefix for invisible operators

**BREAKING CHANGE** The following operators have been changed from `old` ⇒ `new` - INVISIBLE PLUS: `&+` ⇒ `.+` - INVISIBLE TIMES: `&*` ⇒ `.*` - FUNCTION APPLICATION: `&$` ⇒ `.$` - INVISIBLE SEPARATOR: `&,` ⇒ `.,` Resolves: #75
runarberg · Nov 2, 2023 · 55a7d12 · 55a7d12
1 parent 76212df
commit 55a7d12
Show file tree

Hide file tree

Showing 4 changed files with 10 additions and 10 deletions.
diff --git a/demo/test-cases.html b/demo/test-cases.html
@@ -233,7 +233,7 @@ <h2>Super and Subscripts</h2>
         <test-case>a^2_i</test-case>
         <test-case>2^2^2^2</test-case>
         <test-case>a^2 + b^2 = c^2</test-case>
-        <test-case>(X^T)_ i&,j = X_ j&,i</test-case>
+        <test-case>(X^T)_ i.,j = X_ j.,i</test-case>
 
         <test-case display="block">
           ln x = int_1^x 1/t  dt

diff --git a/docs/index.html b/docs/index.html
@@ -475,19 +475,19 @@ <h3>Operators</h3>
             <summary>Operational</summary>
 
             <dl>
-              <dt><code>&$</code></dt>
+              <dt><code>.$</code></dt>
               <dd>
                 <code>FUNCTION APPLICATION</code>
                 (<em>zero width</em>)
               </dd>
 
-              <dt><code>&*</code></dt>
+              <dt><code>.*</code></dt>
               <dd>
                 <code>INVISIBLE TIMES</code>
                 (<em>zero width</em>)
               </dd>
 
-              <dt><code>&+</code></dt>
+              <dt><code>.+</code></dt>
               <dd>
                 <code>INVISIBLE PLUS</code>
                 (<em>zero width</em>)
@@ -928,7 +928,7 @@ <h3>Operators</h3>
             <summary>Punctuations</summary>
 
             <dl>
-              <dt><code>&,</code></dt>
+              <dt><code>.,</code></dt>
               <dd>
                 <code>INVISIBLE SEPARATOR</code>
                 (<em>zero width</em>)

diff --git a/src/compiler/tokenizer/lexemes.js b/src/compiler/tokenizer/lexemes.js
@@ -145,10 +145,10 @@ export const KNOWN_IDENTS = new Map([
 export const KNOWN_OPS = new Map([
   ["!=", { value: "≠" }],
   ["!in", { value: "∉" }],
-  ["&$", { value: "\u2061" }],
-  ["&*", { value: "\u2062" }],
-  ["&+", { value: "\u2064" }],
-  ["&,", { value: "\u2063" }],
+  [".$", { value: "\u2061" }],
+  [".*", { value: "\u2062" }],
+  [".+", { value: "\u2064" }],
+  [".,", { value: "\u2063" }],
   ["'", { value: "′", attrs: { lspace: 0, rspace: 0 } }],
   ["''", { value: "″", attrs: { lspace: 0, rspace: 0 } }],
   ["'''", { value: "‴", attrs: { lspace: 0, rspace: 0 } }],

diff --git a/test/sub-supscripts.js b/test/sub-supscripts.js
@@ -49,7 +49,7 @@ test("Pythagorean theorem", (t) => {
 });
 
 test("Matrix transpose", (t) => {
-  t.snapshot(render("(X^T)_ i&,j = X_ j&,i"));
+  t.snapshot(render("(X^T)_ i.,j = X_ j.,i"));
 });
 
 test("The natural logarithm", (t) => {