mirror of https://github.com/adamdruppe/arsd.git
470 lines
10 KiB
D
470 lines
10 KiB
D
///
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module arsd.htmltotext;
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import arsd.dom;
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import arsd.color;
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import std.string;
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import std.uni : isWhite;
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class HtmlConverter {
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int width;
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void htmlToText(Element element, bool preformatted, int width) {
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this.width = width;
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if(auto tn = cast(TextNode) element) {
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foreach(dchar ch; tn.nodeValue) {
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sink(ch, preformatted);
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}
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} else {
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void sinkChildren() {
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foreach(child; element.childNodes)
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htmlToText(child, preformatted, width);
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}
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switch(element.tagName) {
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case "head", "script", "style":
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// intentionally blank
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break;
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// The table stuff is removed right now because while it looks
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// ok for test tables, it isn't working well for the emails I have
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// - it handles data ok but not really nested layouts.
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case "trfixme":
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auto children = element.childElements;
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auto tdWidth = (width - cast(int)(children.length)*3) / cast(int)(children.length);
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if(tdWidth < 12) {
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// too narrow to be reasonable
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startBlock();
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sinkChildren();
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endBlock();
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} else {
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string[] tdBlocks;
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int longestBlock;
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foreach(child; children) {
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auto fmt = new HtmlConverter();
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fmt.htmlToText(child, false, tdWidth);
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tdBlocks ~= fmt.s;
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int lineCount = 1;
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foreach(ch; fmt.s)
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if(ch == '\n')
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lineCount++;
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if(lineCount > longestBlock)
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longestBlock = lineCount;
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}
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if(s.length && s[$-1] != '\n')
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s ~= '\n';
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foreach(lineNumber; 0 .. longestBlock) {
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foreach(bidx, ref block; tdBlocks) {
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auto ob = block;
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if(bidx)
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s ~= " | ";
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if(block.length) {
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auto idx = block.indexOf("\n");
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if(idx == -1)
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idx = block.length;
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s ~= block[0 .. idx];
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if(idx == block.length)
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block = block[$..$];
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else
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block = block[idx + 1 .. $];
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}
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if(ob.length < tdWidth)
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foreach(a; 0 .. tdWidth - block.length)
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s ~= " ";
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}
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s ~= "\n";
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}
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foreach(a; 0 .. children.length) {
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foreach(w; 0 .. tdWidth) {
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s ~= "-";
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}
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if(a +1 != children.length)
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s ~= "-+-";
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}
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s ~= "\n";
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}
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break;
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case "a":
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sinkChildren();
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if(element.href != element.innerText) {
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sink(' ', false);
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sink('<', false);
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foreach(dchar ch; element.href)
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sink(ch, false);
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sink('>', false);
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}
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break;
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case "span":
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/*
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auto csc = element.computedStyle.getValue("color");
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if(csc.length) {
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auto c = Color.fromString(csc);
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s ~= format("\033[38;2;%d;%d;%dm", c.r, c.g, c.b);
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}
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sinkChildren();
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if(csc.length)
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s ~= "\033[39m";
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*/
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break;
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case "p":
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startBlock();
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sinkChildren();
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endBlock();
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break;
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case "b", "strong":
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case "em", "i":
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if(element.innerText.length == 0)
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break;
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sink('*', false);
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sinkChildren();
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sink('*', false);
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break;
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case "u":
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if(element.innerText.length == 0)
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break;
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sink('_', false);
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sinkChildren();
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sink('_', false);
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break;
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case "ul":
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ulDepth++;
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sinkChildren();
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ulDepth--;
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break;
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case "ol":
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olDepth++;
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sinkChildren();
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olDepth--;
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break;
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case "li":
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startBlock();
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//sink('\t', true);
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sink(' ', true);
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sink(' ', true);
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if(olDepth)
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sink('*', false);
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if(ulDepth)
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sink('*', false);
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sink(' ', true);
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sinkChildren();
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endBlock();
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break;
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case "h1", "h2":
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startBlock();
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sinkChildren();
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sink('\n', true);
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foreach(dchar ch; element.innerText)
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sink(element.tagName == "h1" ? '=' : '-', false);
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endBlock();
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break;
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case "hr":
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startBlock();
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foreach(i; 0 .. width / 4)
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sink(' ', true);
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foreach(i; 0 .. width / 2)
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sink('-', false);
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endBlock();
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break;
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case "br":
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sink('\n', true);
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break;
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case "div":
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startBlock();
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/*
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auto csc = element.computedStyle.getValue("background-color");
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if(csc.length) {
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auto c = Color.fromString(csc);
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s ~= format("\033[48;2;%d;%d;%dm", c.r, c.g, c.b);
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}
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*/
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sinkChildren();
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/*
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if(csc.length)
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s ~= "\033[49m";
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*/
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endBlock();
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break;
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case "pre":
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startBlock();
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foreach(child; element.childNodes)
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htmlToText(child, true, width);
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endBlock();
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break;
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default:
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sinkChildren();
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}
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}
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}
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int olDepth;
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int ulDepth;
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string convert(string html, bool wantWordWrap = true, int wrapAmount = 74) {
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Document document = new Document;
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document.parse("<roottag>" ~ html ~ "</roottag>");
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Element start;
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auto bod = document.getElementsByTagName("body");
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if(bod.length)
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start = bod[0];
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else
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start = document.root;
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//import std.file;
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//auto stylesheet = new StyleSheet(readText("/var/www/dpldocs.info/experimental-docs/style.css"));
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//stylesheet.apply(document);
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htmlToText(start, false, wrapAmount);
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return s;
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}
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void reset() {
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s = null;
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justOutputWhitespace = true;
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justOutputBlock = true;
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justOutputMargin = true;
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}
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string s;
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bool justOutputWhitespace = true;
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bool justOutputBlock = true;
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bool justOutputMargin = true;
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int lineLength;
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void sink(dchar item, bool preformatted) {
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if(!preformatted && isWhite(item)) {
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if(!justOutputWhitespace) {
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item = ' ';
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justOutputWhitespace = true;
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} else {
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return;
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}
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} else {
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// if it is preformatted, we still need to keep track of if it is whitespace
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// so stuff like <br> is somewhat sane
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justOutputWhitespace = preformatted && isWhite(item);
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}
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s ~= item;
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if(lineLength >= width) {
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// rewind to the nearest space, if there is one, to break on a word boundary
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int c = lineLength;
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bool broken;
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foreach_reverse(idx, char ch; s) {
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if(ch == '\n')
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break;
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if(ch == ' ') {
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auto os = s;
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s = os[0 .. idx];
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s ~= '\n';
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s ~= os[idx + 1 .. $];
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lineLength = os[idx+1..$].length;
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broken = true;
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break;
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}
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c--;
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if(c < 5)
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break;
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}
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if(!broken) {
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s ~= '\n';
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lineLength = 0;
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justOutputWhitespace = true;
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}
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}
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if(item == '\n')
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lineLength = 0;
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else
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lineLength ++;
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if(!justOutputWhitespace) {
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justOutputBlock = false;
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justOutputMargin = false;
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}
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}
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void startBlock() {
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if(!justOutputBlock) {
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s ~= "\n";
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lineLength = 0;
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justOutputBlock = true;
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}
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if(!justOutputMargin) {
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s ~= "\n";
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lineLength = 0;
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justOutputMargin = true;
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}
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}
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void endBlock() {
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if(!justOutputMargin) {
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s ~= "\n";
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lineLength = 0;
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justOutputMargin = true;
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}
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}
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}
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string htmlToText(string html, bool wantWordWrap = true, int wrapAmount = 74) {
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auto converter = new HtmlConverter();
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return converter.convert(html, true, wrapAmount);
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}
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string repeat(string s, ulong num) {
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string ret;
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foreach(i; 0 .. num)
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ret ~= s;
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return ret;
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}
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import std.stdio;
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version(none)
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void penis() {
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again:
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string result = "";
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foreach(ele; start.tree) {
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if(ele is start) continue;
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if(ele.nodeType != 1) continue;
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switch(ele.tagName) {
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goto again;
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case "h1":
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ele.innerText = "\r" ~ ele.innerText ~ "\n" ~ repeat("=", ele.innerText.length) ~ "\r";
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ele.stripOut();
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goto again;
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case "h2":
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ele.innerText = "\r" ~ ele.innerText ~ "\n" ~ repeat("-", ele.innerText.length) ~ "\r";
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ele.stripOut();
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goto again;
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case "h3":
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ele.innerText = "\r" ~ ele.innerText.toUpper ~ "\r";
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ele.stripOut();
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goto again;
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case "td":
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case "p":
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/*
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if(ele.innerHTML.length > 1)
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ele.innerHTML = "\r" ~ wrap(ele.innerHTML) ~ "\r";
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ele.stripOut();
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goto again;
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*/
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break;
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case "a":
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string href = ele.getAttribute("href");
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if(href && !ele.hasClass("no-brackets")) {
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if(ele.hasClass("href-text"))
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ele.innerText = href;
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else {
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if(ele.innerText != href)
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ele.innerText = ele.innerText ~ " <" ~ href ~ "> ";
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}
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}
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ele.stripOut();
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goto again;
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case "ol":
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case "ul":
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ele.innerHTML = "\r" ~ ele.innerHTML ~ "\r";
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break;
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case "li":
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if(!ele.innerHTML.startsWith("* "))
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ele.innerHTML = "* " ~ ele.innerHTML ~ "\r";
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// ele.stripOut();
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break;
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case "sup":
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ele.innerText = "^" ~ ele.innerText;
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ele.stripOut();
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break;
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/*
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case "img":
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string alt = ele.getAttribute("alt");
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if(alt)
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result ~= ele.alt;
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break;
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*/
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default:
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ele.stripOut();
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goto again;
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}
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}
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again2:
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//start.innerHTML = start.innerHTML().replace("\u0001", "\n");
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foreach(ele; start.tree) {
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if(ele.tagName == "td") {
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if(ele.directText().strip().length) {
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ele.prependText("\r");
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ele.appendText("\r");
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}
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ele.stripOut();
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goto again2;
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} else if(ele.tagName == "p") {
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if(strip(ele.innerText()).length > 1) {
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string res = "";
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string all = ele.innerText().replace("\n \n", "\n\n");
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foreach(part; all.split("\n\n"))
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res ~= "\r" ~ strip( wantWordWrap ? wrap(part, /*74*/ wrapAmount) : part ) ~ "\r";
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ele.innerText = res;
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} else
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ele.innerText = strip(ele.innerText);
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ele.stripOut();
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goto again2;
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} else if(ele.tagName == "li") {
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auto part = ele.innerText;
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part = strip( wantWordWrap ? wrap(part, wrapAmount - 2) : part );
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part = " " ~ part.replace("\n", "\n\v") ~ "\r";
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ele.innerText = part;
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ele.stripOut();
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goto again2;
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}
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}
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result = start.innerText();
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result = squeeze(result, " ");
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result = result.replace("\r ", "\r");
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result = result.replace(" \r", "\r");
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//result = result.replace("\u00a0", " ");
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result = squeeze(result, "\r");
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result = result.replace("\r", "\n\n");
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result = result.replace("\v", " ");
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result = result.replace("舗", "'"); // HACK: this shouldn't be needed, but apparently is in practice surely due to a bug elsewhere
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result = result.replace(""", "\""); // HACK: this shouldn't be needed, but apparently is in practice surely due to a bug elsewhere
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//result = htmlEntitiesDecode(result); // for special chars mainly
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result = result.replace("\u0001 ", "\n");
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result = result.replace("\u0001", "\n");
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//a = std.regex.replace(a, std.regex.regex("(\n\t)+", "g"), "\n"); //\t");
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return result.strip;
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}
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