rust/doc/prep.js

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#!/usr/local/bin/node
/***
* Pandoc-style markdown preprocessor that drops extra directives
* included for running doc code, and that optionally, when
* --highlight is provided, replaces code blocks that are Rust code
* with highlighted HTML blocks. The directives recognized are:
*
* '## ignore' tells the test extractor (extract-tests.js) to ignore
* the block completely.
* '## notrust' makes the test extractor ignore the block, makes
* this script not highlight the block.
* '# [any text]' is a line that is stripped out by this script, and
* converted to a normal line of code (without the leading #) by
* the test extractor.
*/
var fs = require("fs");
CodeMirror = require("./lib/codemirror-node");
require("./lib/codemirror-rust");
function help() {
console.log("usage: " + process.argv[0] + " [--highlight] [-o outfile] [infile]");
process.exit(1);
}
var highlight = false, infile, outfile;
for (var i = 2; i < process.argv.length; ++i) {
var arg = process.argv[i];
if (arg == "--highlight") highlight = true;
else if (arg == "-o" && outfile == null && ++i < process.argv.length) outfile = process.argv[i];
else if (arg[0] != "-") infile = arg;
else help();
}
var lines = fs.readFileSync(infile || "/dev/stdin").toString().split(/\n\r?/g), cur = 0, line;
var out = outfile ? fs.createWriteStream(outfile) : process.stdout;
while ((line = lines[cur++]) != null) {
if (/^~~~/.test(line)) {
var block = "", bline;
var notRust =
/notrust/.test(line)
// These are all used by the language ref to indicate things
// that are not Rust source code
|| /ebnf/.test(line)
|| /abnf/.test(line)
|| /keyword/.test(line)
|| /field/.test(line)
|| /precedence/.test(line);
var isRust = !notRust;
while ((bline = lines[cur++]) != null) {
if (/^~~~/.test(bline)) break;
if (!/^\s*##? /.test(bline)) block += bline + "\n";
}
if (!highlight || !isRust)
out.write(line + "\n" + block + bline + "\n");
else {
var html = '<pre class="cm-s-default">', curstr = "", curstyle = null;
function add(str, style) {
if (style != curstyle) {
if (curstyle) html += '<span class="cm-' + curstyle + '">' + curstr
+ "</span>";
else if (curstr) html += curstr;
curstr = str; curstyle = style;
} else curstr += str;
}
CodeMirror.runMode(block, "rust", add);
add("", "bogus"); // Flush pending string.
out.write(html + "</pre>\n");
}
} else {
out.write(line + "\n");
}
}