From 3bb2249f3452061247655a11696a93dc5eeae584 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Thu, 9 Dec 2021 14:26:25 -0500
Subject: layout: Handle a corner case

We can't break in a tab run.
This fixes an assertion found by afl.

Testcase included.

Fixes: #638
---
 tests/layouts/tab-assert.layout | 183 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 tests/layouts/tab-assert.layout

(limited to 'tests/layouts/tab-assert.layout')

diff --git a/tests/layouts/tab-assert.layout b/tests/layouts/tab-assert.layout
new file mode 100644
index 00000000..0e3ebf25
--- /dev/null
+++ b/tests/layouts/tab-assert.layout
@@ -0,0 +1,183 @@
+{
+  "context" : {
+    "font" : "serif 12",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1,
+      0,
+      0,
+      1,
+      0,
+      0
+    ]
+  },
+  "comment" : "This layout was triggering an assertion in process_line",
+  "text" : " \t  ",
+  "width" : 0,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "unknown-glyphs" : 0,
+    "width" : 56320,
+    "height" : 56320,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 4,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : {
+              "description" : "DejaVu Sans 12",
+              "checksum" : "69ccd07023a72ceb27a5e5c22f728627353b60a198170f5e58dd7014221abf01",
+              "matrix" : [
+                1,
+                -0,
+                -0,
+                1,
+                0,
+                0
+              ]
+            },
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 1,
+            "length" : 1,
+            "text" : "\t",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : {
+              "description" : "DejaVu Sans 12",
+              "checksum" : "69ccd07023a72ceb27a5e5c22f728627353b60a198170f5e58dd7014221abf01",
+              "matrix" : [
+                1,
+                -0,
+                -0,
+                1,
+                0,
+                0
+              ]
+            },
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268435455,
+                "width" : 40960,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 2,
+            "length" : 2,
+            "text" : "  ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : {
+              "description" : "DejaVu Sans 12",
+              "checksum" : "69ccd07023a72ceb27a5e5c22f728627353b60a198170f5e58dd7014221abf01",
+              "matrix" : [
+                1,
+                -0,
+                -0,
+                1,
+                0,
+                0
+              ]
+            },
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}
-- 
cgit v1.2.1