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Allocate some data in advance in string algorithm

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This commit is contained in:
Maxime Coste 2015-03-14 11:46:53 +00:00
parent 12a732d1fa
commit 82833608c9
1 changed files with 4 additions and 0 deletions
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4
src/string.cc
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@ -59,6 +59,7 @@ Vector<StringView> split(StringView str, char separator)
String escape(StringView str, StringView characters, char escape) String escape(StringView str, StringView characters, char escape)
{ {
String res; String res;
res.reserve(str.length());
for (auto& c : str) for (auto& c : str)
{ {
if (contains(characters, c)) if (contains(characters, c))
@ -71,6 +72,7 @@ String escape(StringView str, StringView characters, char escape)
String unescape(StringView str, StringView characters, char escape) String unescape(StringView str, StringView characters, char escape)
{ {
String res; String res;
res.reserve(str.length());
for (auto& c : str) for (auto& c : str)
{ {
if (contains(characters, c) and not res.empty() and res.back() == escape) if (contains(characters, c) and not res.empty() and res.back() == escape)
@ -84,6 +86,7 @@ String unescape(StringView str, StringView characters, char escape)
String indent(StringView str, StringView indent) String indent(StringView str, StringView indent)
{ {
String res; String res;
res.reserve(str.length());
bool was_eol = true; bool was_eol = true;
for (ByteCount i = 0; i < str.length(); ++i) for (ByteCount i = 0; i < str.length(); ++i)
{ {
@ -144,6 +147,7 @@ bool subsequence_match(StringView str, StringView subseq)
String expand_tabs(StringView line, CharCount tabstop, CharCount col) String expand_tabs(StringView line, CharCount tabstop, CharCount col)
{ {
String res; String res;
res.reserve(line.length());
using Utf8It = utf8::iterator<const char*>; using Utf8It = utf8::iterator<const char*>;
for (Utf8It it = line.begin(); it.base() < line.end(); ++it) for (Utf8It it = line.begin(); it.base() < line.end(); ++it)
{ {