[pango/line-breaker: 7/49] Add a paragraph attribute

[Matthias Clasen <matthiasc src gnome org>]

commit 3eba288ec502e3711ad1aef92fb149d1707e4900
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 21 23:25:45 2022 -0500

    Add a paragraph attribute
    
    This will be used to implement single-paragraph mode.

 pango/pango-attributes.c | 32 ++++++++++++++++++++++++++++++++
 pango/pango-attributes.h |  4 ++++
 pango/serializer.c       |  7 +++++++
 3 files changed, 43 insertions(+)
---
diff --git a/pango/pango-attributes.c b/pango/pango-attributes.c
index a984e6f2..01b865bc 100644
--- a/pango/pango-attributes.c
+++ b/pango/pango-attributes.c
@@ -1421,6 +1421,31 @@ pango_attr_sentence_new (void)
   return pango_attr_int_new (&klass, 1);
 }
 
+/**
+ * pango_attr_paragraph_new:
+ *
+ * Marks the range of the attribute as a single paragraph.
+ *
+ * Newlines and similar characters in the range of the attribute
+ * will not be treated as paragraph separators.
+ *
+ * Return value: (transfer full): the newly allocated
+ *   `PangoAttribute`, which should be freed with
+ *   [method@Pango.Attribute.destroy]
+ */
+PangoAttribute *
+pango_attr_paragraph_new (void)
+{
+  static const PangoAttrClass klass = {
+    PANGO_ATTR_PARAGRAPH,
+    pango_attr_int_copy,
+    pango_attr_int_destroy,
+    pango_attr_int_equal,
+  };
+
+  return pango_attr_int_new (&klass, 1);
+}
+
 /**
  * pango_attr_overline_new:
  * @overline: the overline style
@@ -1598,6 +1623,7 @@ pango_attribute_as_int (PangoAttribute *attr)
     case PANGO_ATTR_TEXT_TRANSFORM:
     case PANGO_ATTR_WORD:
     case PANGO_ATTR_SENTENCE:
+    case PANGO_ATTR_PARAGRAPH:
     case PANGO_ATTR_BASELINE_SHIFT:
     case PANGO_ATTR_FONT_SCALE:
       return (PangoAttrInt *)attr;
@@ -3050,6 +3076,12 @@ pango_attr_list_from_string (const char *text)
           attr = pango_attr_sentence_new ();
           break;
 
+        case PANGO_ATTR_PARAGRAPH:
+          integer = g_ascii_strtoll (p, &endp, 10);
+          if (!is_valid_end_char (*endp)) goto fail;
+          attr = pango_attr_paragraph_new ();
+          break;
+
         case PANGO_ATTR_BASELINE_SHIFT:
           ENUM_ATTR(baseline_shift, PangoBaselineShift, 0, G_MAXINT);
           break;
diff --git a/pango/pango-attributes.h b/pango/pango-attributes.h
index 69ff9e52..1f32714b 100644
--- a/pango/pango-attributes.h
+++ b/pango/pango-attributes.h
@@ -79,6 +79,7 @@ typedef struct _PangoAttrFontFeatures PangoAttrFontFeatures;
  * @PANGO_ATTR_ABSOLUTE_LINE_HEIGHT: line height ([struct@Pango.AttrInt]). Since: 1.50
  * @PANGO_ATTR_WORD: override segmentation to classify the range of the attribute as a single word 
([struct@Pango.AttrInt]). Since 1.50
  * @PANGO_ATTR_SENTENCE: override segmentation to classify the range of the attribute as a single sentence 
([struct@Pango.AttrInt]). Since 1.50
+ * @PANGO_ATTR_PARAGRAPH: override segmentation to classify the range of the attribute as a single paragraph 
([struct@Pango.AttrInt]).
  * @PANGO_ATTR_BASELINE_SHIFT: baseline displacement ([struct@Pango.AttrInt]). Since 1.50
  * @PANGO_ATTR_FONT_SCALE: font-relative size change ([struct@Pango.AttrInt]). Since 1.50
  *
@@ -129,6 +130,7 @@ typedef enum
   PANGO_ATTR_SENTENCE,          /* PangoAttrInt */
   PANGO_ATTR_BASELINE_SHIFT,    /* PangoAttrSize */
   PANGO_ATTR_FONT_SCALE,        /* PangoAttrInt */
+  PANGO_ATTR_PARAGRAPH,         /* PangoAttrInt */
 } PangoAttrType;
 
 /**
@@ -592,6 +594,8 @@ PANGO_AVAILABLE_IN_1_50
 PangoAttribute *        pango_attr_word_new                     (void);
 PANGO_AVAILABLE_IN_1_50
 PangoAttribute *        pango_attr_sentence_new                 (void);
+PANGO_AVAILABLE_IN_ALL
+PangoAttribute *        pango_attr_paragraph_new                (void);
 
 PANGO_AVAILABLE_IN_1_44
 PangoAttribute *        pango_attr_insert_hyphens_new           (gboolean                     
insert_hyphens);
diff --git a/pango/serializer.c b/pango/serializer.c
index 2dab93b4..b3409550 100644
--- a/pango/serializer.c
+++ b/pango/serializer.c
@@ -201,6 +201,7 @@ static const char *attr_type_names[] = {
   "sentence",
   "baseline-shift",
   "font-scale",
+  "paragraph",
   NULL
 };
 
@@ -350,6 +351,7 @@ add_attribute (GtkJsonPrinter *printer,
     case PANGO_ATTR_SHOW:
     case PANGO_ATTR_WORD:
     case PANGO_ATTR_SENTENCE:
+    case PANGO_ATTR_PARAGRAPH:
     case PANGO_ATTR_ABSOLUTE_LINE_HEIGHT:
       gtk_json_printer_add_integer (printer, "value", ((PangoAttrInt*)attr)->value);
       break;
@@ -1077,6 +1079,11 @@ attr_for_type (GtkJsonParser *parser,
     case PANGO_ATTR_FONT_SCALE:
       attr = pango_attr_font_scale_new ((PangoFontScale) parser_select_string (parser, font_scale_names));
       break;
+
+    case PANGO_ATTR_PARAGRAPH:
+      attr = pango_attr_paragraph_new ();
+      break;
+
     }
 
   attr->start_index = start;