From b14f20e839ba9375ee53df8612501d80d0f1b720 Mon Sep 17 00:00:00 2001
From: Chris Markiewicz <effigies@gmail.com>
Date: Fri, 2 Aug 2024 14:52:42 -0400
Subject: [PATCH 1/2] feat: Add exists(..., file) for file-relative paths

---
 bids-validator/src/schema/expressionLanguage.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/bids-validator/src/schema/expressionLanguage.ts b/bids-validator/src/schema/expressionLanguage.ts
index d9ff767fa..a501ef4d5 100644
--- a/bids-validator/src/schema/expressionLanguage.ts
+++ b/bids-validator/src/schema/expressionLanguage.ts
@@ -1,15 +1,17 @@
-function exists(list: string[], rule: string = 'dataset'): number {
+import { BIDSContext } from './context.ts'
+
+function exists(this: BIDSContext, list: string[], rule: string = 'dataset'): number {
   if (list == null) {
     return 0
   }
 
   const prefix: string[] = []
+  const fileTree = rule == 'file' ? this.file.parent : this.fileTree
 
   // Stimuli and subject-relative paths get prefixes
   if (rule == 'stimuli') {
     prefix.push('stimuli')
   } else if (rule == 'subject') {
-    // @ts-expect-error
     prefix.push('sub-' + this.entities.sub)
   }
 
@@ -28,8 +30,7 @@ function exists(list: string[], rule: string = 'dataset'): number {
     // dataset, subject and stimuli
     return list.filter((x) => {
       const parts = prefix.concat(x.split('/'))
-      // @ts-expect-error
-      return this.fileTree.contains(parts)
+      return fileTree.contains(parts)
     }).length
   }
 }

From 5ece19e81a9f2d951cf264ed314fc77e293b0cd6 Mon Sep 17 00:00:00 2001
From: Chris Markiewicz <effigies@gmail.com>
Date: Fri, 2 Aug 2024 22:08:12 -0400
Subject: [PATCH 2/2] test(expressions): Test file-relative existence check

---
 .../src/schema/expressionLanguage.test.ts           | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/bids-validator/src/schema/expressionLanguage.test.ts b/bids-validator/src/schema/expressionLanguage.test.ts
index 21bd5d454..91ed78215 100644
--- a/bids-validator/src/schema/expressionLanguage.test.ts
+++ b/bids-validator/src/schema/expressionLanguage.test.ts
@@ -91,8 +91,9 @@ Deno.test('test expression functions', async (t) => {
     assert(count(['a', 'b', 'a', 'b'], 'a') === 2)
     assert(count(['a', 'b', 'a', 'b'], 'c') === 0)
   })
+
+  const exists = expressionFunctions.exists.bind(context)
   await t.step('exists(..., "dataset") function', () => {
-    const exists = expressionFunctions.exists.bind(context)
     assert(exists([], 'dataset') === 0)
     assert(
       exists(['sub-01/ses-01/anat/sub-01_ses-01_T1w.nii.gz'], 'dataset') === 1,
@@ -105,7 +106,6 @@ Deno.test('test expression functions', async (t) => {
     )
   })
   await t.step('exists(..., "subject") function', () => {
-    const exists = expressionFunctions.exists.bind(context)
     assert(exists([], 'subject') === 0)
     assert(exists(['ses-01/anat/sub-01_ses-01_T1w.nii.gz'], 'subject') === 1)
     assert(
@@ -115,15 +115,19 @@ Deno.test('test expression functions', async (t) => {
       ) === 1,
     )
   })
+  await t.step('exists(..., "file") function', () => {
+    assert(exists([], 'file') === 0)
+    assert(exists(['sub-01_ses-01_T1w.nii.gz'], 'file') === 1)
+    assert(exists(['sub-01_ses-01_T1w.nii.gz', 'sub-01_ses-01_T1w.json'], 'file') === 2)
+    assert(exists(['sub-01_ses-01_T1w.nii.gz', 'ses-01_T1w.json'], 'file') === 1)
+  })
   await t.step('exists(..., "stimuli") function', () => {
-    const exists = expressionFunctions.exists.bind(context)
     assert(exists([], 'stimuli') === 0)
     assert(exists(['stimfile1.png'], 'stimuli') === 1)
     assert(exists(['stimfile1.png', 'stimfile2.png'], 'stimuli') === 2)
     assert(exists(['X.png', 'Y.png'], 'stimuli') === 0)
   })
   await t.step('exists(..., "bids-uri") function', () => {
-    const exists = expressionFunctions.exists.bind(context)
     assert(exists([], 'subject') === 0)
     assert(
       exists(
@@ -140,6 +144,7 @@ Deno.test('test expression functions', async (t) => {
     // Not yet implemented; currently returns length of array
     // assert(exists(['bids::sub-01/ses-01/anat/sub-01_ses-01_T1w.nii.gz', 'bids::T2w.json'], 'bids-uri') === 1)
   })
+
   await t.step('substr function', () => {
     const substr = expressionFunctions.substr
     assert(substr('abc', 0, 1) === 'a')