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Mini Shell
Mini Shell
/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2013-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_STR_INT_TOOLS_TEMPLATE_H_
#define _PASSENGER_STR_INT_TOOLS_TEMPLATE_H_
#include <string>
#include <cstring>
#include <cstdio>
#include <StaticString.h>
#include <StrIntTools/StrIntUtils.h>
#include <DataStructures/StringMap.h>
namespace Passenger {
using namespace std;
/**
* Implements a simple HTML templating language.
*/
class Template {
private:
typedef string::size_type size_type;
struct State {
string result;
const StringMap<StaticString> &substitutions;
State(const StaticString &content, const StringMap<StaticString> &_substitutions)
: result(content.data(), content.size()),
substitutions(_substitutions)
{ }
};
struct Options {
bool raw;
string defaultValue;
Options() {
raw = false;
}
};
StaticString content;
static bool isNameCharacter(char ch) {
return (ch >= 'a' && ch <= 'z')
|| (ch >= 'A' && ch <= 'Z')
|| (ch >= '0' && ch <= '9')
|| ch == '_';
}
static StaticString readOptionName(const char **current) {
while (**current != '\0' && (**current == ',' || **current == ' ')) {
(*current)++;
}
const char *begin = *current;
while (**current != '\0' && isNameCharacter(**current)) {
(*current)++;
}
const char *end = *current;
return StaticString(begin, end - begin);
}
static StaticString readOptionValue(const char **current) {
while (**current != '\0' && **current == ' ') {
(*current)++;
}
if (**current == '=') {
(*current)++;
const char *begin = *current;
while (**current != '\0' && **current != ',') {
(*current)++;
}
const char *end = *current;
return StaticString(begin, end - begin);
} else {
return StaticString();
}
}
static Options parseOptions(const string &optionsString) {
Options options;
const char *current = optionsString.data();
while (*current != '\0') {
StaticString name = readOptionName(¤t);
StaticString value = readOptionValue(¤t);
if (name == "raw") {
options.raw = true;
} else if (name == "default") {
options.defaultValue = value;
} else {
fprintf(stderr, "Unknown template option '%s'\n", name.c_str());
}
}
return options;
}
static string &makeBreakable(string &html) {
string::size_type i = 0;
while (i < html.size()) {
char ch = html[i];
if (ch == '=' || ch == ',' || ch == ';' || ch == ':') {
html.insert(i + 1, "<wbr>");
i += sizeof("<wbr>");
} else if (ch == '&') {
// HTML escape character; skip to end.
do {
i++;
} while (i < html.size() && html[i] != ';');
if (i < html.size()) {
i++;
}
} else {
i++;
}
}
return html;
}
size_type processIf(State &state, size_type pos, size_type conditionEndPos, const string &name) {
const size_t prefixSize = sizeof("if ") - 1;
const size_t endIfSize = sizeof("{{/if}}") - 1;
const string condition = name.substr(prefixSize, name.size() - prefixSize);
const string evalResult = state.substitutions.get(condition);
conditionEndPos += sizeof("}}") - 1;
size_type endIfPos = state.result.find("{{/if}}", conditionEndPos);
if (endIfPos == string::npos) {
return state.result.size();
}
if (!evalResult.empty() && evalResult != "false") {
const string subContent = state.result.substr(conditionEndPos, endIfPos - conditionEndPos);
State subState(subContent, state.substitutions);
apply(subState);
state.result.replace(pos, endIfPos + endIfSize - pos, subState.result);
return pos + subState.result.size();
} else {
state.result.erase(pos, endIfPos - pos + sizeof("{{/if}}") - 1);
return pos;
}
}
size_type processSubsitution(State &state, size_type pos, size_type endPos, string name) {
Options options;
size_type sep = name.find('|');
if (sep != string::npos) {
const string optionsString = name.substr(sep + 1);
name = name.substr(0, sep);
options = parseOptions(optionsString);
}
string value = state.substitutions.get(name);
if (value.empty()) {
value = options.defaultValue;
}
if (!options.raw) {
value = escapeHTML(value);
makeBreakable(value);
}
state.result.replace(pos, endPos - pos + (sizeof("}}") - 1), value);
return pos + value.size();
}
size_type processCommand(State &state, size_type pos) {
size_type endPos = state.result.find("}}", pos);
if (endPos == string::npos) {
return state.result.size();
}
string name = state.result.substr(pos + 2, endPos - pos - 2);
if (startsWith(name, "if ")) {
return processIf(state, pos, endPos, name);
} else {
return processSubsitution(state, pos, endPos, name);
}
}
void apply(State &state) {
size_type searchStart = 0;
while (searchStart < state.result.size()) {
size_type pos = state.result.find("{{", searchStart);
if (pos == string::npos) {
searchStart = state.result.size();
} else {
searchStart = processCommand(state, pos);
}
}
}
public:
Template(const StaticString &_content)
: content(_content)
{ }
string apply(const StringMap<StaticString> &substitutions) {
State state(content, substitutions);
apply(state);
return state.result;
}
static string apply(const StaticString &content, const StringMap<StaticString> &substitutions) {
return Template(content).apply(substitutions);
}
};
} // namespace Passenger
#endif /* _PASSENGER_STR_INT_TOOLS_TEMPLATE_H_ */
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