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/**
* Copyright (c) 2017, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @file text_format.cc
*/
#include "text_format.hh"
#include "config.h"
#include "pcrepp/pcre2pp.hh"
#include "yajl/api/yajl_parse.h"
text_format_t
detect_text_format(string_fragment sf,
nonstd::optional<ghc::filesystem::path> path)
{
static const auto GZ_EXT = ghc::filesystem::path(".gz");
static const auto BZ2_EXT = ghc::filesystem::path(".bz2");
static const auto MD_EXT = ghc::filesystem::path(".md");
static const auto MARKDOWN_EXT = ghc::filesystem::path(".markdown");
static const auto MAN_MATCHERS = lnav::pcre2pp::code::from_const(
R"(^[A-Za-z][A-Za-z\-_\+0-9]+\(\d\)\s+)", PCRE2_MULTILINE);
// XXX This is a pretty crude way of detecting format...
static const auto PYTHON_MATCHERS = lnav::pcre2pp::code::from_const(
"(?:"
"^\\s*def\\s+\\w+\\([^)]*\\):[^\\n]*$|"
"^\\s*try:[^\\n]*$"
")",
PCRE2_MULTILINE);
static const auto RUST_MATCHERS
= lnav::pcre2pp::code::from_const(R"(
(?:
^\s*use\s+[\w+:\{\}]+;$|
^\s*(?:pub)?\s+(?:const|enum|fn)\s+\w+.*$|
^\s*impl\s+\w+.*$
)
)",
PCRE2_MULTILINE);
static const auto JAVA_MATCHERS = lnav::pcre2pp::code::from_const(
"(?:"
"^package\\s+|"
"^import\\s+|"
"^\\s*(?:public)?\\s*class\\s*(\\w+\\s+)*\\s*{"
")",
PCRE2_MULTILINE);
static const auto C_LIKE_MATCHERS = lnav::pcre2pp::code::from_const(
"(?:"
"^#\\s*include\\s+|"
"^#\\s*define\\s+|"
"^\\s*if\\s+\\([^)]+\\)[^\\n]*$|"
"^\\s*(?:\\w+\\s+)*class \\w+ {"
")",
PCRE2_MULTILINE);
static const auto SQL_MATCHERS = lnav::pcre2pp::code::from_const(
"(?:"
"select\\s+.+\\s+from\\s+|"
"insert\\s+into\\s+.+\\s+values"
")",
PCRE2_MULTILINE | PCRE2_CASELESS);
static const auto XML_MATCHERS = lnav::pcre2pp::code::from_const(
"(?:"
R"(<\?xml(\s+\w+\s*=\s*"[^"]*")*\?>|)"
R"(</?\w+(\s+\w+\s*=\s*"[^"]*")*\s*>)"
")",
PCRE2_MULTILINE | PCRE2_CASELESS);
text_format_t retval = text_format_t::TF_UNKNOWN;
if (path) {
if (path->extension() == GZ_EXT) {
path = path->stem();
}
if (path->extension() == BZ2_EXT) {
path = path->stem();
}
if (path->extension() == MD_EXT || path->extension() == MARKDOWN_EXT) {
return text_format_t::TF_MARKDOWN;
}
}
{
auto_mem<yajl_handle_t> jhandle(yajl_free);
jhandle = yajl_alloc(nullptr, nullptr, nullptr);
if (yajl_parse(jhandle, sf.udata(), sf.length()) == yajl_status_ok) {
return text_format_t::TF_JSON;
}
}
if (MAN_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_MAN;
}
if (PYTHON_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_PYTHON;
}
if (RUST_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_RUST;
}
if (JAVA_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_JAVA;
}
if (C_LIKE_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_C_LIKE;
}
if (SQL_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_SQL;
}
if (XML_MATCHERS.find_in(sf).ignore_error()) {
return text_format_t::TF_XML;
}
return retval;
}
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