Reduce size of Flutter config even more

Uncompressed size: 883,280B (862.6 KB), minus 363.2KB
Compressed size: 460,972B (450.2KB), minus 83.9KB

The following unused resources are removed:
 * uts46.nrm
 * nfkc_cf.nrm
 * cnvalias.icu
 * Break Iterators for:
   * Sentence breaks
   * Title breaks
   * CSS-specific line breaks ("regular" line breaks are still supported)

Change-Id: I26f932b2e991f44c6d86fe9858724d34c5c323b7
Reviewed-on: https://chromium-review.googlesource.com/1162775
Reviewed-by: Jungshik Shin <[email protected]>
Reviewed-by: Greg Spencer <[email protected]>

Author: goderbauer

flutter/README.md

@@ -0,0 +1,23 @@
+# ICU Data for Flutter
+
+This directory contains the minimal ICU data configuration for the Flutter
+framework (https://flutter.io). It is based on Chromium's iOS configuration
+(see `../ios`) with additional data stripped out to reduce size:
+
+ * All resources mentioned in `flutter-removed-resources.txt` are stripped out.
+ * Additionally, `brkitr.patch` removes the break iterators for sentence and
+   title breaks as well as the CSS specific line break iterators.
+
+## Included Resources
+
+ * Break iterators (and related dictionaries) for:
+   * Characters
+   * Words
+   * Lines
+ * Unicode Normalization Form KC (NFKC)
+ * Likely Subtags
+
+
+## Known Issues
+
+ * https://github.com/flutter/flutter/issues/19584

flutter/brkitr.patch

@@ -0,0 +1,66 @@
+diff --git a/source/data/brkitr/brklocal.mk b/source/data/brkitr/brklocal.mk
+index ea12e27f..462a2551 100644
+--- a/source/data/brkitr/brklocal.mk
++++ b/source/data/brkitr/brklocal.mk
+@@ -39,14 +39,11 @@ BRK_DICT_SOURCE = burmesedict.txt khmerdict.txt laodict.txt\
+ 
+ 
+ # List of break iterator files (brk).
+-BRK_SOURCE = char.txt line.txt\
+- line_normal.txt line_normal_cj.txt line_normal_fi.txt\
+- line_loose_cj.txt\
+- sent.txt sent_el.txt title.txt word.txt word_ja.txt
++BRK_SOURCE = char.txt\
++ line_normal.txt line_normal_fi.txt\
++ word.txt word_ja.txt
+ 
+ 
+ # Ordinary resources
+-BRK_RES_SOURCE = de.txt el.txt en.txt en_US.txt\
+- es.txt fi.txt fr.txt it.txt ja.txt\
+- pt.txt ru.txt zh.txt zh_Hant.txt
++BRK_RES_SOURCE =fi.txt ja.txt
+ 
+diff --git a/source/data/brkitr/fi.txt b/source/data/brkitr/fi.txt
+index 72029ee4..633862a7 100644
+--- a/source/data/brkitr/fi.txt
++++ b/source/data/brkitr/fi.txt
+@@ -4,8 +4,5 @@ fi{
+     Version{"2.1.19.14"}
+     boundaries{
+         line:process(dependency){"line_normal_fi.brk"}
+-        line_loose:process(dependency){"line_normal_fi.brk"}
+-        line_normal:process(dependency){"line_normal_fi.brk"}
+-        line_strict:process(dependency){"line_normal_fi.brk"}
+     }
+ }
+diff --git a/source/data/brkitr/ja.txt b/source/data/brkitr/ja.txt
+index cb732a76..73ebc6f8 100644
+--- a/source/data/brkitr/ja.txt
++++ b/source/data/brkitr/ja.txt
+@@ -4,9 +4,6 @@ ja{
+     Version{"2.1.29.25"}
+     boundaries{
+         line:process(dependency){"line_normal.brk"}
+-        line_loose:process(dependency){"line_loose_cj.brk"}
+-        line_normal:process(dependency){"line_normal_cj.brk"}
+-        line_strict:process(dependency){"line.brk"}
+         word:process(dependency){"word_ja.brk"}
+     }
+ }
+diff --git a/source/data/brkitr/root.txt b/source/data/brkitr/root.txt
+index f1fa4e08..4071947a 100644
+--- a/source/data/brkitr/root.txt
++++ b/source/data/brkitr/root.txt
+@@ -5,11 +5,6 @@ root{
+     boundaries{
+         grapheme:process(dependency){"char.brk"}
+         line:process(dependency){"line_normal.brk"}
+-        line_loose:process(dependency){"line_normal.brk"}
+-        line_normal:process(dependency){"line_normal.brk"}
+-        line_strict:process(dependency){"line.brk"}
+-        sentence:process(dependency){"sent.brk"}
+-        title:process(dependency){"title.brk"}
+         word:process(dependency){"word.brk"}
+     }
+     dictionaries{

flutter/flutter-removed-resources.txt

@@ -388,8 +388,9 @@ timezoneTypes.res
 windowsZones.res
 zoneinfo64.res
 
-# *.cnv
+# mappings/*
 big5-html.cnv
+cnvalias.icu
 euc-jp-html.cnv
 euc-kr-html.cnv
 gb18030.cnv
@@ -425,3 +426,5 @@ x-mac-cyrillic-html.cnv
 
 # other
 confusables.cfu
+uts46.nrm
+nfkc_cf.nrm

flutter/icudtl.dat

@@ -0,0 +1,10 @@
+#!/bin/sh
+# Copyright (c) 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+treeroot="$(dirname "$0")/.."
+cd "${treeroot}"
+
+echo "Applying brkitr.patch"
+patch -p1 < flutter/brkitr.patch || { echo "failed to patch" >&2; exit 1; }

flutter/patch_brkitr.sh

@@ -16,6 +16,8 @@ $ICUROOT/scripts/copy_data.sh android
 $ICUROOT/ios/patch_locale.sh
 $ICUROOT/scripts/make_data.sh
 $ICUROOT/scripts/copy_data.sh ios
+$ICUROOT/flutter/patch_brkitr.sh
+$ICUROOT/scripts/make_data.sh
 $ICUROOT/scripts/copy_data.sh flutter
 $ICUROOT/scripts/clean_up_data_source.sh