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Improve the language detection at the beginning of a file

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* The Shebang detection is much improved:
  * detect more languages
  * not tied to any specific full path
* There is not need to have a space after <?php
* Remove the closing `>` in the html doctype to
  support older versions of html as well
This commit is contained in:
Frank Fesevur 2015-10-19 22:03:48 +02:00 committed by Don Ho
parent 49260a1dee
commit 6526dd0b26
1 changed files with 43 additions and 18 deletions
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61
PowerEditor/src/ScitillaComponent/Buffer.cpp
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@ -1255,26 +1255,25 @@ LangType FileManager::detectLanguageFromTextBegining(const unsigned char *data,
{
// it detectes xml, php and bash script file
std::string xmlHeader = "<?xml "; // length : 6
std::string phpHeader = "<?php "; // length : 6
std::string shebang1 = "#!/bin/sh"; // length : 9
std::string shebang2 = "#!/bin/bash"; // length : 11
std::string phpHeader = "<?php"; // length : 5
std::string shebang = "#!"; // length : 2
std::string htmlHeader2 = "<html>"; // length : 6
std::string htmlHeader1 = "<!DOCTYPE html>"; // length : 15
const size_t longestLength = htmlHeader1.length(); // longest length : html header Length
const size_t shortestLength = xmlHeader.length();
size_t i = 0;
std::string htmlHeader1 = "<!DOCTYPE html"; // length : 14
const size_t longestLength = 40; // shebangs can be large
const size_t shortestLength = shebang.length();
if (dataLen <= shortestLength)
return L_TEXT;
// Eliminate BOM if present
size_t i = 0;
if ((data[0] == 0xEF && data[1] == 0xBB && data[2] == 0xBF) || // UTF8 BOM
(data[0] == 0xFE && data[1] == 0xFF && data[2] == 0x00) || // UTF16 BE BOM
(data[0] == 0xFF && data[1] == 0xFE && data[2] == 0x00)) // UTF16 LE BOM
i += 3;
// Skip any space-like char
for (; i < dataLen; ++i)
{
if (data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r')
@ -1283,15 +1282,41 @@ LangType FileManager::detectLanguageFromTextBegining(const unsigned char *data,
std::string buf2Test = std::string((const char *)data + i, longestLength);
auto res = std::mismatch(shebang1.begin(), shebang1.end(), buf2Test.begin());
if (res.first == shebang1.end())
// Is there a \r or \n in the buffer?
auto cr = buf2Test.find("\r");
auto nl = buf2Test.find("\n");
auto crnl = min(cr, nl);
if (crnl != std::string::npos && crnl < longestLength)
buf2Test = std::string((const char *)data + i, crnl);
// First test for a Unix-like Shebang
// See https://en.wikipedia.org/wiki/Shebang_%28Unix%29 for more details about Shebang
auto res = std::mismatch(shebang.begin(), shebang.end(), buf2Test.begin());
if (res.first == shebang.end())
{
return L_BASH;
}
res = std::mismatch(shebang2.begin(), shebang2.end(), buf2Test.begin());
if (res.first == shebang2.end())
{
return L_BASH;
// Try the most common used languages
if (buf2Test.find("python") != std::string::npos)
{
return L_PYTHON;
}
if (buf2Test.find("perl") != std::string::npos)
{
return L_PERL;
}
if (buf2Test.find("php") != std::string::npos)
{
return L_PHP;
}
if (buf2Test.find("ruby") != std::string::npos)
{
return L_RUBY;
}
if (buf2Test.find("sh") != std::string::npos)
{
return L_BASH;
}
return L_TEXT; // Unrecognized shebang (there is always room for improvement ;-)
}
res = std::mismatch(phpHeader.begin(), phpHeader.end(), buf2Test.begin());