From 8a9733d8a93c9b45390ff91b2fa50c139a56ee80 Mon Sep 17 00:00:00 2001
From: qwinsi <70425035+qwinsi@users.noreply.github.com>
Date: Sun, 8 Dec 2024 10:45:47 +0800
Subject: [PATCH] add support for Typst round function

---
 package.json    |  2 +-
 src/writer.ts   | 20 +++++++++++++++++---
 test/symbol.yml |  8 ++++----
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/package.json b/package.json
index 3e2d543..d40536d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tex2typst",
-  "version": "0.2.9",
+  "version": "0.2.10",
   "description": "JavaScript library for converting TeX code to Typst",
   "type": "module",
   "main": "dist/index.js",
diff --git a/src/writer.ts b/src/writer.ts
index 67f32f8..a43a99a 100644
--- a/src/writer.ts
+++ b/src/writer.ts
@@ -280,8 +280,17 @@ export class TypstWriter {
             res = res.replace(/ceil\(\)/g, 'ceil("")');
             return res;
         }
-        this.buffer = smartFloorPass(this.buffer);
-        this.buffer = smartCeilPass(this.buffer);
+        const smartRoundPass = function (input: string): string {
+            // Use regex to replace all "⌊ xxx ⌉" with "round(xxx)"
+            let res = input.replace(/⌊\s*(.*?)\s*⌉/g, "round($1)");
+            // Typst disallow "round()" with empty argument, so add an empty string inside if it's empty.
+            res = res.replace(/round\(\)/g, 'round("")');
+            return res;
+        }
+        const all_passes = [smartFloorPass, smartCeilPass, smartRoundPass];
+        for (const pass of all_passes) {
+            this.buffer = pass(this.buffer);
+        }
         return this.buffer;
     }
 }
@@ -352,7 +361,12 @@ export function convertTree(node: TexNode): TypstNode {
                 content: '',
                 args: node.args!.map(convertTree),
             };                
-            if (["[]", "()", "\\{\\}", "\\lfloor\\rfloor", "\\lceil\\rceil"].includes(left.content + right.content)) {
+            if ([
+                    "[]", "()", "\\{\\}",
+                    "\\lfloor\\rfloor",
+                    "\\lceil\\rceil",
+                    "\\lfloor\\rceil",
+                ].includes(left.content + right.content)) {
                 return group;
             }
             return {
diff --git a/test/symbol.yml b/test/symbol.yml
index 5a618ab..8b2f8c5 100644
--- a/test/symbol.yml
+++ b/test/symbol.yml
@@ -74,15 +74,15 @@ cases:
   - title: combinatorial number
     tex: \binom{n}{k}
     typst: binom(n, k)
-  - title: unpaired left and right floor, ceil 1
-    tex: \lfloor \rceil \left \lfloor \frac{1}{2} \right \rceil
-    typst: ⌊ ⌉ lr(⌊ frac(1, 2) ⌉)
-  - title: unpaired left and right floor,ceil 2
+  - title: unpaired left and right floor,ceil
     tex: \rfloor \lceil \left\lceil \frac{1}{2} \right \rfloor
     typst: ⌋ ⌈ lr(⌈ frac(1, 2) ⌋)
   - title: paired left and right floor,ceil
     tex: \lfloor x \rfloor \lceil x \rceil \left\lceil \frac{1}{2} \right \rceil 
     typst: floor(x) ceil(x) ceil(frac(1, 2))
+  - title: paired lfloor and rceil
+    tex: \lfloor \rceil \lfloor x \rceil \left \lfloor \frac{1}{2} \right \rceil
+    typst: round("") round(x) round(frac(1, 2))
   - title: trigonometric functions
     tex: \sin \cos \tan \cot \sec \csc
     typst: sin cos tan cot sec csc