From ed1ec0d67ed54e9710281564541c97811e4de596 Mon Sep 17 00:00:00 2001
From: bloeys <bloeys@outlook.com>
Date: Tue, 5 Jul 2022 07:29:33 +0400
Subject: [PATCH] Basic run extraction

---
 glyphs/glyphs.go | 35 ++++++++++++++++++++++++++++-------
 main.go          |  3 +++
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/glyphs/glyphs.go b/glyphs/glyphs.go
index 28418b9..8eaf184 100755
--- a/glyphs/glyphs.go
+++ b/glyphs/glyphs.go
@@ -143,14 +143,35 @@ func (gr *GlyphRend) DrawTextOpenGLAbs(text string, screenPos *gglm.Vec3, color
 
 func (gr *GlyphRend) GetTextRuns(t string) [][]rune {
 
-	// rs := []rune(t)
-	// runScript := unicode.Arabic
-	// runStartIndex := 0
-	// runs := make([][]rune, 0)
-	// for i := 0; i < len(rs); i++ {
+	rs := []rune(t)
 
-	// }
-	return nil
+	if len(rs) == 0 {
+		return [][]rune{}
+	}
+
+	runs := make([][]rune, 0, 1)
+	currRunScript := RuneInfos[rs[0]].ScriptTable
+
+	runStartIndex := 0
+	for i := 1; i < len(rs); i++ {
+
+		r := rs[i]
+		ri := RuneInfos[r]
+		if ri.ScriptTable == currRunScript || ri.ScriptTable == unicode.Common {
+			continue
+		}
+
+		runs = append(runs, rs[runStartIndex:i])
+
+		runStartIndex = i
+		currRunScript = ri.ScriptTable
+	}
+
+	if runStartIndex != len(rs)-1 {
+		runs = append(runs, rs[runStartIndex:])
+	}
+
+	return runs
 }
 
 func (gr *GlyphRend) glyphFromRunes(curr, prev, next rune) *FontAtlasGlyph {
diff --git a/main.go b/main.go
index 3fb9dd7..b363683 100755
--- a/main.go
+++ b/main.go
@@ -100,6 +100,9 @@ func (p *program) Init() {
 
 	p.gridMat = materials.NewMaterial("grid", "./res/shaders/grid.glsl")
 	p.handleWindowResize()
+
+	// runs := p.GlyphRend.GetTextRuns("hello there يا friend")
+	// fmt.Printf("%+v\n%s\n%s\n%s\n", runs, string(runs[0]), string(runs[1]), string(runs[2]))
 }
 
 func (p *program) Update() {