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annotate 3rdparty/maddy/headlineparser.h @ 0:a4671277546c tip

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created the repository for the thymian project
author ferencd
date Tue, 17 Aug 2021 11:19:54 +0200
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ferencd@0 1 /*
ferencd@0 2 * This project is licensed under the MIT license. For more information see the
ferencd@0 3 * LICENSE file.
ferencd@0 4 */
ferencd@0 5 #pragma once
ferencd@0 6
ferencd@0 7 // -----------------------------------------------------------------------------
ferencd@0 8
ferencd@0 9 #include <functional>
ferencd@0 10 #include <string>
ferencd@0 11 #include <regex>
ferencd@0 12
ferencd@0 13 #include "maddy/blockparser.h"
ferencd@0 14
ferencd@0 15 // -----------------------------------------------------------------------------
ferencd@0 16
ferencd@0 17 namespace maddy {
ferencd@0 18
ferencd@0 19 // -----------------------------------------------------------------------------
ferencd@0 20
ferencd@0 21 /**
ferencd@0 22 * HeadlineParser
ferencd@0 23 *
ferencd@0 24 * From Markdown:
ferencd@0 25 *
ferencd@0 26 * ```
ferencd@0 27 * # Headline 1
ferencd@0 28 * ## Headline 2
ferencd@0 29 * ### Headline 3
ferencd@0 30 * #### Headline 4
ferencd@0 31 * ##### Headline 5
ferencd@0 32 * ###### Headline 6
ferencd@0 33 * ```
ferencd@0 34 *
ferencd@0 35 * To HTML:
ferencd@0 36 *
ferencd@0 37 * ```
ferencd@0 38 * <h1>Headline 1</h1>
ferencd@0 39 * <h2>Headline 2</h2>
ferencd@0 40 * <h3>Headline 3</h3>
ferencd@0 41 * <h4>Headline 4</h4>
ferencd@0 42 * <h5>Headline 5</h5>
ferencd@0 43 * <h6>Headline 6</h6>
ferencd@0 44 * ```
ferencd@0 45 *
ferencd@0 46 * @class
ferencd@0 47 */
ferencd@0 48 class HeadlineParser : public BlockParser
ferencd@0 49 {
ferencd@0 50 public:
ferencd@0 51 /**
ferencd@0 52 * ctor
ferencd@0 53 *
ferencd@0 54 * @method
ferencd@0 55 * @param {std::function<void(std::string&)>} parseLineCallback
ferencd@0 56 * @param {std::function<std::shared_ptr<BlockParser>(const std::string& line)>} getBlockParserForLineCallback
ferencd@0 57 */
ferencd@0 58 HeadlineParser(
ferencd@0 59 std::function<void(std::string&)> parseLineCallback,
ferencd@0 60 std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback
ferencd@0 61 )
ferencd@0 62 : BlockParser(parseLineCallback, getBlockParserForLineCallback)
ferencd@0 63 {}
ferencd@0 64
ferencd@0 65 /**
ferencd@0 66 * IsStartingLine
ferencd@0 67 *
ferencd@0 68 * If the line starts with 1 - 6 `#`, then it is a headline.
ferencd@0 69 *
ferencd@0 70 * @method
ferencd@0 71 * @param {const std::string&} line
ferencd@0 72 * @return {bool}
ferencd@0 73 */
ferencd@0 74 static bool
ferencd@0 75 IsStartingLine(const std::string& line)
ferencd@0 76 {
ferencd@0 77 static std::regex re("^(?:#){1,6} (.*)");
ferencd@0 78 return std::regex_match(line, re);
ferencd@0 79 }
ferencd@0 80
ferencd@0 81 /**
ferencd@0 82 * IsFinished
ferencd@0 83 *
ferencd@0 84 * The headline is always only one line long, so this method always returns
ferencd@0 85 * true.
ferencd@0 86 *
ferencd@0 87 * @method
ferencd@0 88 * @return {bool}
ferencd@0 89 */
ferencd@0 90 bool
ferencd@0 91 IsFinished() const override
ferencd@0 92 {
ferencd@0 93 return true;
ferencd@0 94 }
ferencd@0 95
ferencd@0 96 protected:
ferencd@0 97 bool
ferencd@0 98 isInlineBlockAllowed() const override
ferencd@0 99 {
ferencd@0 100 return false;
ferencd@0 101 }
ferencd@0 102
ferencd@0 103 bool
ferencd@0 104 isLineParserAllowed() const override
ferencd@0 105 {
ferencd@0 106 return false;
ferencd@0 107 }
ferencd@0 108
ferencd@0 109 void
ferencd@0 110 parseBlock(std::string& line) override
ferencd@0 111 {
ferencd@0 112 static std::vector<std::regex> hlRegex = {
ferencd@0 113 std::regex("^# (.*)")
ferencd@0 114 , std::regex("^(?:#){2} (.*)")
ferencd@0 115 , std::regex("^(?:#){3} (.*)")
ferencd@0 116 , std::regex("^(?:#){4} (.*)")
ferencd@0 117 , std::regex("^(?:#){5} (.*)")
ferencd@0 118 , std::regex("^(?:#){6} (.*)")
ferencd@0 119 };
ferencd@0 120 static std::vector<std::string> hlReplacement = {
ferencd@0 121 "<h1>$1</h1>"
ferencd@0 122 , "<h2>$1</h2>"
ferencd@0 123 , "<h3>$1</h3>"
ferencd@0 124 , "<h4>$1</h4>"
ferencd@0 125 , "<h5>$1</h5>"
ferencd@0 126 , "<h6>$1</h6>"
ferencd@0 127 };
ferencd@0 128
ferencd@0 129 for (uint8_t i = 0; i < 6; ++i)
ferencd@0 130 {
ferencd@0 131 line = std::regex_replace(line, hlRegex[i], hlReplacement[i]);
ferencd@0 132 }
ferencd@0 133 }
ferencd@0 134 }; // class HeadlineParser
ferencd@0 135
ferencd@0 136 // -----------------------------------------------------------------------------
ferencd@0 137
ferencd@0 138 } // namespace maddy