From 9abe34873b1ea7c5fcc0bad20b311d85b04fc648 Mon Sep 17 00:00:00 2001
From: Peter Odding <peter@peterodding.com>
Date: Tue, 14 Jun 2011 06:43:24 +0200
Subject: 2x faster syntax highlighting using Python Interface to Vim :-)

---
 misc/easytags/highlight.py | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 misc/easytags/highlight.py

(limited to 'misc/easytags/highlight.py')

diff --git a/misc/easytags/highlight.py b/misc/easytags/highlight.py
new file mode 100644
index 0000000..b7a9cf3
--- /dev/null
+++ b/misc/easytags/highlight.py
@@ -0,0 +1,55 @@
+'''
+This Python script is part of the easytags plug-in for the Vim text editor. The
+Python Interface to Vim is used to load this script which accelerates dynamic
+syntax highlighting by reimplementing tag file reading and :syntax command
+generation in Python with a focus on doing the least amount of work.
+
+Author: Peter Odding <peter@peterodding.com>
+Last Change: June 14, 2011
+URL: http://peterodding.com/code/vim/easytags
+'''
+
+# TODO Cache the contents of tags files to further improve performance?
+
+import re
+import vim
+import sys
+
+def easytags_ping():
+    print 'it works!'
+
+def easytags_gensyncmd(tagsfiles, filetype, tagkinds, syntaxgroup, prefix, suffix, filters):
+    # Get arguments from Vim.
+    if filters:
+        tagkinds = filters['kind']
+    # Shallow parse tags files for matching identifiers.
+    pattern = '^([^\t]+)\t[^\t]+\t[^\t]+\t' + tagkinds + '\tlanguage:' + filetype
+    compiled_pattern = re.compile(pattern, re.IGNORECASE)
+    matches = {}
+    for fname in tagsfiles:
+        handle = open(fname)
+        for line in handle:
+            m = compiled_pattern.match(line)
+            if m and ('match' not in filters or re.search(filters['match'], line)) \
+                    and ('nomatch' not in filters or not re.search(filters['nomatch'], line)):
+                matches[m.group(1)] = True
+        handle.close()
+    # Generate Vim :syntax command to highlight identifiers.
+    patterns, commands = [], []
+    counter, limit = 0, 1024 * 20
+    to_escape = re.compile(r'[.*^$/\\~\[\]]')
+    for ident in matches.keys():
+        escaped = to_escape.sub(r'\\\0', ident)
+        patterns.append(escaped)
+        counter += len(escaped)
+        if counter > limit:
+            commands.append(_easytags_makecmd(syntaxgroup, prefix, suffix, patterns))
+            patterns = []
+            counter = 0
+    if patterns:
+        commands.append(_easytags_makecmd(syntaxgroup, prefix, suffix, patterns))
+    return ' | '.join(commands)
+
+def _easytags_makecmd(syntaxgroup, prefix, suffix, patterns):
+    template = r'syntax match %s /%s\%%(%s\)%s/ containedin=ALLBUT,.*String.*,.*Comment.*,cIncluded'
+    return template % (syntaxgroup, prefix, r'\|'.join(patterns), suffix)
-- 
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