From c230658bae80dcd6a56669218b9386f6ae13e372 Mon Sep 17 00:00:00 2001
From: Rob Rix <rob.rix@me.com>
Date: Fri, 10 Feb 2017 09:10:31 -0500
Subject: [PATCH] Add public API to set the input string with explicit length.

---
 include/tree_sitter/runtime.h | 1 +
 src/runtime/document.c        | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/tree_sitter/runtime.h b/include/tree_sitter/runtime.h
index 00d8e7c4..69334ad0 100644
--- a/include/tree_sitter/runtime.h
+++ b/include/tree_sitter/runtime.h
@@ -104,6 +104,7 @@ void ts_document_set_language(TSDocument *, const TSLanguage *);
 TSInput ts_document_input(TSDocument *);
 void ts_document_set_input(TSDocument *, TSInput);
 void ts_document_set_input_string(TSDocument *, const char *);
+void ts_document_set_input_string_with_length(TSDocument *, const char *, uint32_t);
 TSLogger ts_document_logger(const TSDocument *);
 void ts_document_set_logger(TSDocument *, TSLogger);
 void ts_document_print_debugging_graphs(TSDocument *, bool);
diff --git a/src/runtime/document.c b/src/runtime/document.c
index 8c1eb779..ff09610d 100644
--- a/src/runtime/document.c
+++ b/src/runtime/document.c
@@ -77,6 +77,15 @@ void ts_document_set_input_string(TSDocument *self, const char *text) {
   }
 }
 
+void ts_document_set_input_string_with_length(TSDocument *self, const char *text, uint32_t length) {
+  ts_document_invalidate(self);
+  TSInput input = ts_string_input_make_with_length(text, length);
+  ts_document_set_input(self, input);
+  if (input.payload) {
+    self->owns_input = true;
+  }
+}
+
 void ts_document_edit(TSDocument *self, TSInputEdit edit) {
   if (!self->tree)
     return;