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Make highlighting more useful as a lib #43

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Make highlighting more useful as a lib #43

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0212d85
highlighter takes optional output range.
Aug 2, 2013
901c777
Add 'highlightBare' function which only outputs the span-highlighted …
Aug 2, 2013
f290e05
highlightBare supports optional CSS class prefix for better CSS hygiene.
Aug 2, 2013
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80 changes: 65 additions & 15 deletions highlighter.d
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Original file line number Diff line number Diff line change
Expand Up @@ -8,24 +8,70 @@ module highlighter;

import std.stdio;
import std.array;
import std.range;
import std.d.lexer;

void writeSpan(string cssClass, string value)
void writeSpan(Sink)(ref Sink sink, string cssClassPrefix, string cssClass, string value)
if(isOutputRange!(Sink, string))
{
stdout.write(`<span class="`, cssClass, `">`, value.replace("&", "&amp;").replace("<", "&lt;"), `</span>`);
sink.put(`<span class="`);
sink.put(cssClassPrefix);
sink.put(cssClass);
sink.put(`">`);
sink.put(value.replace("&", "&amp;").replace("<", "&lt;"));
sink.put(`</span>`);
}

private struct StdoutSink
{
void put(string data)
{
stdout.write(data);
}
}

// http://ethanschoonover.com/solarized
void highlight(R)(TokenRange!R tokens, string fileName)
{
stdout.writeln(q"[
StdoutSink sink;
highlight(tokens, sink, fileName);
}

/// Outputs span-highlighted code only, no wrapper HTML
void highlightBare(R)(TokenRange!R tokens, string cssClassPrefix=null)
{
StdoutSink sink;
highlightBare(tokens, sink, cssClassPrefix);
}

void highlight(R, Sink)(TokenRange!R tokens, ref Sink sink, string fileName)
if (isOutputRange!(Sink, string))
{
highlightImpl(tokens, sink, fileName, false, null);
}

/// Outputs span-highlighted code only, no wrapper HTML
void highlightBare(R, Sink)(TokenRange!R tokens, ref Sink sink, string cssClassPrefix=null)
if (isOutputRange!(Sink, string))
{
highlightImpl(tokens, sink, null, true, cssClassPrefix);
}

private void highlightImpl(R, Sink)(TokenRange!R tokens, ref Sink sink, string fileName, bool bare, string cssClassPrefix)
if (isOutputRange!(Sink, string))
{
if (!bare)
{
sink.put(q"[
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>]");
stdout.writeln("<title>", fileName, "</title>");
stdout.writeln(q"[</head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
]");
sink.put("<title>");
sink.put(fileName);
sink.put("</title>\n");
sink.put(q"[</head>
<body>
<style type="text/css">
html { background-color: #fdf6e3; color: #002b36; }
Expand All @@ -37,26 +83,30 @@ html { background-color: #fdf6e3; color: #002b36; }
.type { color: #268bd2; font-weight: bold; }
.cons { color: #859900; font-weight: bold; }
</style>
<pre>]");
<pre>
]");
}

foreach (Token t; tokens)
{
if (isBasicType(t.type))
writeSpan("type", t.value);
writeSpan(sink, cssClassPrefix, "type", t.value);
else if (isKeyword(t.type))
writeSpan("kwrd", t.value);
writeSpan(sink, cssClassPrefix, "kwrd", t.value);
else if (t.type == TokenType.comment)
writeSpan("com", t.value);
writeSpan(sink, cssClassPrefix, "com", t.value);
else if (isStringLiteral(t.type) || t.type == TokenType.characterLiteral)
writeSpan("str", t.value);
writeSpan(sink, cssClassPrefix, "str", t.value);
else if (isNumberLiteral(t.type))
writeSpan("num", t.value);
writeSpan(sink, cssClassPrefix, "num", t.value);
else if (isOperator(t.type))
writeSpan("op", t.value);
writeSpan(sink, cssClassPrefix, "op", t.value);
else
stdout.write(t.value.replace("<", "&lt;"));
sink.put(t.value.replace("<", "&lt;"));
}
stdout.writeln("</pre>\n</body></html>");

if (!bare)
sink.put("</pre>\n</body></html>\n");
}

/+void main(string[] args)
Expand Down