mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/** @file Whiskers.h
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* @author Chris <chis@ethereum.org>
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* @date 2017
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*
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* Moustache-like templates.
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*/
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#pragma once
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#include <libsolutil/Exceptions.h>
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#include <string>
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#include <map>
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#include <vector>
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namespace solidity::util
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{
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DEV_SIMPLE_EXCEPTION(WhiskersError);
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/**
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* Moustache-like templates.
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*
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* Usage:
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* std::vector<std::map<std::string, std::string>> listValues(2);
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* listValues[0]["k"] = "key1";
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* listValues[0]["v"] = "value1";
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* listValues[1]["k"] = "key2";
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* listValues[1]["v"] = "value2";
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* auto s = Whiskers("<?c><p1><!c>y</c>\n<#list><k> -> <v>\n</list>")
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* ("p1", "HEAD")
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* ("c", true)
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* ("list", listValues)
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* .render();
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*
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* results in s == "HEAD\nkey1 -> value1\nkey2 -> value2\n"
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*
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* Note that lists cannot themselves contain lists - this would be a future feature.
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*
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* The elements are:
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* - Regular parameter: <name>
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* just replaced
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* - Condition parameter: <?name>...<!name>...</name>, where "<!name>" is optional
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* replaced (and recursively expanded) by the first part if the condition is true
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* and by the second (or empty string if missing) if the condition is false
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* - Conditional string parameter: <?+name>...<!+name>...</+name>
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* Works similar to a conditional parameter where the checked condition is
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* that the regular (string) parameter called "name" is non-empty.
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* - List parameter: <#list>...</list>
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* The part between the tags is repeated as often as values are provided
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* in the mapping. Each list element can have its own parameter -> value mapping.
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*/
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class Whiskers
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{
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public:
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using StringMap = std::map<std::string, std::string>;
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using StringListMap = std::map<std::string, std::vector<StringMap>>;
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explicit Whiskers(std::string _template = "");
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/// Sets a single regular parameter, <paramName>.
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Whiskers& operator()(std::string _parameter, std::string _value);
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Whiskers& operator()(std::string _parameter, char const* _value) { return (*this)(_parameter, std::string{_value}); }
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/// Sets a condition parameter, <?paramName>...<!paramName>...</paramName>
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Whiskers& operator()(std::string _parameter, bool _value);
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/// Sets a list parameter, <#listName> </listName>.
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Whiskers& operator()(
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std::string _listParameter,
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std::vector<StringMap> _values
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);
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std::string render() const;
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private:
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// Prevent implicit cast to bool
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Whiskers& operator()(std::string _parameter, long long);
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void checkParameterValid(std::string const& _parameter) const;
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void checkParameterUnknown(std::string const& _parameter) const;
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/// Checks whether the string stored in `m_template` contains all the tags specified.
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/// @param _parameter name of the parameter. This name is used to construct the tag(s).
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/// @param _prefixes a vector of strings, where each element is used to compose the tag
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/// like `"<" + element + _parameter + ">"`. Each element of _prefixes is used as a prefix of the tag name.
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void checkTemplateContainsTags(std::string const& _parameter, std::vector<std::string> const& _prefixes) const;
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static std::string replace(
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std::string const& _template,
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StringMap const& _parameters,
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std::map<std::string, bool> const& _conditions,
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StringListMap const& _listParameters = StringListMap()
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);
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static std::string paramRegex() { return "[a-zA-Z0-9_$-]+"; }
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/// Joins the two maps throwing an exception if two keys are equal.
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static StringMap joinMaps(StringMap const& _a, StringMap const& _b);
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std::string m_template;
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StringMap m_parameters;
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std::map<std::string, bool> m_conditions;
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StringListMap m_listParameters;
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};
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}
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