250 lines
10 KiB
Java
250 lines
10 KiB
Java
/*#######################################################
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*
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* Maintained by Gregor Santner, 2018-
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* https://gsantner.net/
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*
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* License: Apache 2.0 / Commercial
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* https://github.com/gsantner/opoc/#licensing
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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#########################################################*/
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/*
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* Parses most common markdown tags. Only inline tags are supported, multiline/block syntax
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* is not supported (citation, multiline code, ..). This is intended to stay as easy as possible.
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*
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* You can e.g. apply a accent color by replacing #000001 with your accentColor string.
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*
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* FILTER_ANDROID_TEXTVIEW output is intended to be used at simple Android TextViews,
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* were a limited set of _html tags is supported. This allow to still display e.g. a simple
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* CHANGELOG.md file without including a WebView for showing HTML, or other additional UI-libraries.
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*
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* FILTER_WEB is intended to be used at engines understanding most common HTML tags.
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*/
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package net.gsantner.opoc.format.markdown;
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import java.io.BufferedReader;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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/**
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* Simple Markdown Parser
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*/
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@SuppressWarnings({"WeakerAccess", "CaughtExceptionImmediatelyRethrown", "SameParameterValue", "unused", "SpellCheckingInspection", "RepeatedSpace", "SingleCharAlternation", "Convert2Lambda"})
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public class SimpleMarkdownParser {
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//########################
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//## Statics
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//########################
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public interface SmpFilter {
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String filter(String text);
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}
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public final static SmpFilter FILTER_ANDROID_TEXTVIEW = new SmpFilter() {
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@Override
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public String filter(String text) {
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// TextView supports a limited set of html tags, most notably
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// a href, b, big, font size&color, i, li, small, u
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// Don't start new line if 2 empty lines and heading
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while (text.contains("\n\n#")) {
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text = text.replace("\n\n#", "\n#");
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}
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return text
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.replaceAll("(?s)<!--.*?-->", "") // HTML comments
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.replace("\n\n", "\n<br/>\n") // Start new line if 2 empty lines
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.replace("~°", " ") // double space/half tab
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.replaceAll("(?m)^### (.*)$", "<br/><big><b><font color='#000000'>$1</font></b></big><br/>") // h3
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.replaceAll("(?m)^## (.*)$", "<br/><big><big><b><font color='#000000'>$1</font></b></big></big><br/><br/>") // h2 (DEP: h3)
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.replaceAll("(?m)^# (.*)$", "<br/><big><big><big><b><font color='#000000'>$1</font></b></big></big></big><br/><br/>") // h1 (DEP: h2,h3)
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.replaceAll("!\\[(.*?)\\]\\((.*?)\\)", "<a href=\\'$2\\'>$1</a>") // img
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.replaceAll("\\[(.*?)\\]\\((.*?)\\)", "<a href=\\'$2\\'>$1</a>") // a href (DEP: img)
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.replaceAll("<(http|https):\\/\\/(.*)>", "<a href='$1://$2'>$1://$2</a>") // a href (DEP: img)
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.replaceAll("(?m)^([-*] )(.*)$", "<font color='#000001'>•</font> $2<br/>") // unordered list + end line
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.replaceAll("(?m)^ (-|\\*) ([^<]*)$", " <font color='#000001'>•</font> $2<br/>") // unordered list2 + end line
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.replaceAll("`([^<]*)`", "<font face='monospace'>$1</font>") // code
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.replace("\\*", "●") // temporary replace escaped star symbol
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.replaceAll("(?m)\\*\\*(.*)\\*\\*", "<b>$1</b>") // bold (DEP: temp star)
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.replaceAll("(?m)\\*(.*)\\*", "<i>$1</i>") // italic (DEP: temp star code)
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.replace("●", "*") // restore escaped star symbol (DEP: b,i)
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.replaceAll("(?m) $", "<br/>") // new line (DEP: ul)
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;
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}
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};
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public final static SmpFilter FILTER_WEB = new SmpFilter() {
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@Override
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public String filter(String text) {
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// Don't start new line if 2 empty lines and heading
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while (text.contains("\n\n#")) {
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text = text.replace("\n\n#", "\n#");
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}
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text = text
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.replaceAll("(?s)<!--.*?-->", "") // HTML comments
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.replace("\n\n", "\n<br/>\n") // Start new line if 2 empty lines
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.replaceAll("~°", " ") // double space/half tab
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.replaceAll("(?m)^### (.*)$", "<h3>$1</h3>") // h3
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.replaceAll("(?m)^## (.*)$", "<h2>$1</h2>") /// h2 (DEP: h3)
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.replaceAll("(?m)^# (.*)$", "<h1>$1</h1>") // h1 (DEP: h2,h3)
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.replaceAll("!\\[(.*?)\\]\\((.*?)\\)", "<img src=\\'$2\\' alt='$1' />") // img
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.replaceAll("<(http|https):\\/\\/(.*)>", "<a href='$1://$2'>$1://$2</a>") // a href (DEP: img)
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.replaceAll("\\[(.*?)\\]\\((.*?)\\)", "<a href=\\'$2\\'>$1</a>") // a href (DEP: img)
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.replaceAll("(?m)^[-*] (.*)$", "<font color='#000001'>•</font> $1 ") // unordered list + end line
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.replaceAll("(?m)^ [-*] (.*)$", " <font color='#000001'>•</font> $1 ") // unordered list2 + end line
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.replaceAll("`([^<]*)`", "<code>$1</code>") // code
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.replace("\\*", "●") // temporary replace escaped star symbol
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.replaceAll("(?m)\\*\\*(.*)\\*\\*", "<b>$1</b>") // bold (DEP: temp star)
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.replaceAll("(?m)\\*(.*)\\*", "<i>$1</i>") // italic (DEP: temp star code)
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.replace("●", "*") // restore escaped star symbol (DEP: b,i)
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.replaceAll("(?m) $", "<br/>") // new line (DEP: ul)
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;
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return text;
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}
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};
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public final static SmpFilter FILTER_CHANGELOG = new SmpFilter() {
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@Override
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public String filter(String text) {
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text = text
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.replace("New:", "<font color='#276230'>New:</font>")
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.replace("New features:", "<font color='#276230'>New:</font>")
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.replace("Added:", "<font color='#276230'>Added:</font>")
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.replace("Add:", "<font color='#276230'>Add:</font>")
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.replace("Fixed:", "<font color='#005688'>Fixed:</font>")
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.replace("Fix:", "<font color='#005688'>Fix:</font>")
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.replace("Removed:", "<font color='#C13524'>Removed:</font>")
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.replace("Updated:", "<font color='#555555'>Updated:</font>")
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.replace("Improved:", "<font color='#555555'>Improved:</font>")
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.replace("Modified:", "<font color='#555555'>Modified:</font>")
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.replace("Mod:", "<font color='#555555'>Mod:</font>")
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;
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return text;
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}
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};
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public final static SmpFilter FILTER_H_TO_SUP = new SmpFilter() {
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@Override
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public String filter(String text) {
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text = text
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.replace("<h1>", "<sup><sup><sup>")
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.replace("</h1>", "</sup></sup></sup>")
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.replace("<h2>", "<sup><sup>")
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.replace("</h2>", "</sup></sup>")
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.replace("<h3>", "<sup>")
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.replace("</h3>", "</sup>")
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;
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return text;
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}
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};
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public final static SmpFilter FILTER_NONE = new SmpFilter() {
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@Override
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public String filter(String text) {
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return text;
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}
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};
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//########################
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//## Singleton
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//########################
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private static SimpleMarkdownParser __instance;
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public static SimpleMarkdownParser get() {
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if (__instance == null) {
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__instance = new SimpleMarkdownParser();
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}
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return __instance;
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}
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//########################
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//## Members, Constructors
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//########################
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private SmpFilter _defaultSmpFilter;
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private String _html;
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public SimpleMarkdownParser() {
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setDefaultSmpFilter(FILTER_WEB);
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}
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//########################
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//## Methods
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//########################
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public SimpleMarkdownParser setDefaultSmpFilter(SmpFilter defaultSmpFilter) {
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_defaultSmpFilter = defaultSmpFilter;
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return this;
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}
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public SimpleMarkdownParser parse(String filepath, SmpFilter... smpFilters) throws IOException {
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return parse(new FileInputStream(filepath), "", smpFilters);
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}
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public SimpleMarkdownParser parse(InputStream inputStream, String lineMdPrefix, SmpFilter... smpFilters) throws IOException {
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StringBuilder sb = new StringBuilder();
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BufferedReader br = null;
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String line;
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try {
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br = new BufferedReader(new InputStreamReader(inputStream));
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while ((line = br.readLine()) != null) {
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sb.append(lineMdPrefix);
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sb.append(line);
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sb.append("\n");
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}
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} catch (IOException rethrow) {
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_html = "";
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throw rethrow;
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} finally {
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if (br != null) {
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try {
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br.close();
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} catch (IOException ignored) {
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}
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}
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}
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_html = parse(sb.toString(), "", smpFilters).getHtml();
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return this;
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}
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public SimpleMarkdownParser parse(String markdown, String lineMdPrefix, SmpFilter... smpFilters) throws IOException {
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_html = markdown;
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if (smpFilters.length == 0) {
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smpFilters = new SmpFilter[]{_defaultSmpFilter};
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}
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for (SmpFilter smpFilter : smpFilters) {
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_html = smpFilter.filter(_html).trim();
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}
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return this;
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}
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public String getHtml() {
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return _html;
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}
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public SimpleMarkdownParser setHtml(String html) {
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_html = html;
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return this;
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}
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public SimpleMarkdownParser removeMultiNewlines() {
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_html = _html.replace("\n", "").replaceAll("(<br/>){3,}", "<br/><br/>");
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return this;
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}
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public SimpleMarkdownParser replaceBulletCharacter(String replacment) {
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_html = _html.replace("•", replacment);
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return this;
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}
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public SimpleMarkdownParser replaceColor(String hexColor, int newIntColor) {
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_html = _html.replace(hexColor, String.format("#%06X", 0xFFFFFF & newIntColor));
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return this;
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}
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@Override
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public String toString() {
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return _html != null ? _html : "";
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}
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}
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