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Add syntax highlighting to the code snippets in the tutorial

Using the CodeMirror Rust mode.
This commit is contained in:
Marijn Haverbeke 2011-11-01 12:26:17 +01:00
parent 8b57cb90e5
commit e8e2cd44f4
8 changed files with 631 additions and 16 deletions

View file

@ -1,4 +1,22 @@
var fs = require("fs"), md = require("./lib/markdown"); var fs = require("fs"), md = require("./lib/markdown");
CodeMirror = require("./lib/codemirror-node");
require("./lib/codemirror-rust");
md.Markdown.dialects.Maruku.block.code = function code(block, next) {
if (block.match(/^ /)) {
var text = block.replace(/(^|\n) /g, "$1"), accum = [], curstr = "", curstyle = null;
function add(str, style) {
if (style != curstyle) {
if (curstyle) accum.push(["span", {"class": "cm-" + curstyle}, curstr]);
else if (curstr) accum.push(curstr);
curstr = str; curstyle = style;
} else curstr += str;
}
CodeMirror.runMode(text, "rust", add);
add("", "bogus"); // Flush pending string.
return [["pre", {"class": "cm-s-default"}].concat(accum)];
}
};
function markdown(str) { return md.toHTML(str, "Maruku"); } function markdown(str) { return md.toHTML(str, "Maruku"); }
@ -19,6 +37,7 @@ function fileDates(file, c) {
function head(title) { function head(title) {
return "<html><head><link rel='stylesheet' href='style.css' type='text/css'>" + return "<html><head><link rel='stylesheet' href='style.css' type='text/css'>" +
"<link rel='stylesheet' href='default.css' type='text/css'>" +
"<meta http-equiv='Content-Type' content='text/html; charset=utf-8'><title>" + "<meta http-equiv='Content-Type' content='text/html; charset=utf-8'><title>" +
title + "</title></head><body>\n"; title + "</title></head><body>\n";
} }

View file

@ -13,11 +13,11 @@ types).
## Records ## Records
Rust record types are written `{field1: TYPE, field2: TYPE [, Rust record types are written `{field1: TYPE, field2: TYPE [, ...]}`,
...]}`, and record literals are written in the same way, but with and record literals are written in the same way, but with expressions
expressions instead of types. They are quite similar to C structs, and instead of types. They are quite similar to C structs, and even laid
even laid out the same way in memory (so you can read from a Rust out the same way in memory (so you can read from a Rust struct in C,
struct in C, and vice-versa). and vice-versa).
The dot operator is used to access record fields (`mypoint.x`). The dot operator is used to access record fields (`mypoint.x`).
@ -100,6 +100,8 @@ equivalent to an `enum` in C:
This will define `north`, `east`, `south`, and `west` as constants, This will define `north`, `east`, `south`, and `west` as constants,
all of which have type `direction`. all of which have type `direction`.
<a name="single_variant_tag"></a>
There is a special case for tags with a single variant. These are used There is a special case for tags with a single variant. These are used
to define new types in such a way that the new name is not just a to define new types in such a way that the new name is not just a
synonym for an existing type, but its own distinct type. If you say: synonym for an existing type, but its own distinct type. If you say:

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@ -0,0 +1,124 @@
exports.htmlEscape = function(text) {
var replacements = {"<": "&lt;", ">": "&gt;",
"&": "&amp;", "\"": "&quot;"};
return text.replace(/[<>&"]/g, function(character) {
return replacements[character];
});
};
exports.splitLines = function(string){return string.split(/\r?\n/);};
// Counts the column offset in a string, taking tabs into account.
// Used mostly to find indentation.
function countColumn(string, end) {
if (end == null) {
end = string.search(/[^\s\u00a0]/);
if (end == -1) end = string.length;
}
for (var i = 0, n = 0; i < end; ++i) {
if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
else ++n;
}
return n;
}
function StringStream(string) {
this.pos = this.start = 0;
this.string = string;
}
StringStream.prototype = {
eol: function() {return this.pos >= this.string.length;},
sol: function() {return this.pos == 0;},
peek: function() {return this.string.charAt(this.pos);},
next: function() {
if (this.pos < this.string.length)
return this.string.charAt(this.pos++);
},
eat: function(match) {
var ch = this.string.charAt(this.pos);
if (typeof match == "string") var ok = ch == match;
else var ok = ch && (match.test ? match.test(ch) : match(ch));
if (ok) {++this.pos; return ch;}
},
eatWhile: function(match) {
var start = this.pos;
while (this.eat(match)){}
return this.pos > start;
},
eatSpace: function() {
var start = this.pos;
while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
return this.pos > start;
},
skipToEnd: function() {this.pos = this.string.length;},
skipTo: function(ch) {
var found = this.string.indexOf(ch, this.pos);
if (found > -1) {this.pos = found; return true;}
},
backUp: function(n) {this.pos -= n;},
column: function() {return countColumn(this.string, this.start);},
indentation: function() {return countColumn(this.string);},
match: function(pattern, consume, caseInsensitive) {
if (typeof pattern == "string") {
function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
if (consume !== false) this.pos += pattern.length;
return true;
}
}
else {
var match = this.string.slice(this.pos).match(pattern);
if (match && consume !== false) this.pos += match[0].length;
return match;
}
},
current: function(){return this.string.slice(this.start, this.pos);}
};
exports.StringStream = StringStream;
exports.startState = function(mode, a1, a2) {
return mode.startState ? mode.startState(a1, a2) : true;
};
var modes = {}, mimeModes = {};
exports.defineMode = function(name, mode) { modes[name] = mode; };
exports.defineMIME = function(mime, spec) { mimeModes[mime] = spec; };
exports.getMode = function(options, spec) {
if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
spec = mimeModes[spec];
if (typeof spec == "string")
var mname = spec, config = {};
else if (spec != null)
var mname = spec.name, config = spec;
var mfactory = modes[mname];
if (!mfactory) throw new Error("Unknown mode: " + spec);
return mfactory(options, config || {});
};
exports.runMode = function(string, modespec, callback) {
var mode = exports.getMode({indentUnit: 2}, modespec);
var isNode = callback.nodeType == 1;
if (isNode) {
var node = callback, accum = [];
callback = function(string, style) {
if (string == "\n")
accum.push("<br>");
else if (style)
accum.push("<span class=\"cm-" + exports.htmlEscape(style) + "\">" + exports.htmlEscape(string) + "</span>");
else
accum.push(exports.htmlEscape(string));
}
}
var lines = exports.splitLines(string), state = exports.startState(mode);
for (var i = 0, e = lines.length; i < e; ++i) {
if (i) callback("\n");
var stream = new exports.StringStream(lines[i]);
while (!stream.eol()) {
var style = mode.token(stream, state);
callback(stream.current(), style, i, stream.start);
stream.start = stream.pos;
}
}
if (isNode)
node.innerHTML = accum.join("");
};

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@ -0,0 +1,405 @@
CodeMirror.defineMode("rust", function() {
var indentUnit = 4, altIndentUnit = 2;
var valKeywords = {
"if": "if-style", "while": "if-style", "else": "else-style",
"do": "else-style", "ret": "else-style", "fail": "else-style",
"break": "atom", "cont": "atom", "const": "let", "resource": "fn",
"let": "let", "fn": "fn", "for": "for", "alt": "alt", "obj": "fn",
"lambda": "fn", "type": "type", "tag": "tag", "mod": "mod",
"as": "op", "true": "atom", "false": "atom", "assert": "op", "check": "op",
"claim": "op", "native": "ignore", "unsafe": "ignore", "import": "else-style",
"export": "else-style", "copy": "op", "log": "op", "log_err": "op", "use": "op"
};
var typeKeywords = function() {
var keywords = {"fn": "fn", "block": "fn", "obj": "obj"};
var atoms = "bool uint int i8 i16 i32 i64 u8 u16 u32 u64 float f32 f64 str char".split(" ");
for (var i = 0, e = atoms.length; i < e; ++i) keywords[atoms[i]] = "atom";
return keywords;
}();
var operatorChar = /[+\-*&%=<>!?|\.@]/;
// Tokenizer
// Used as scratch variable to communicate multiple values without
// consing up tons of objects.
var tcat, content;
function r(tc, style) {
tcat = tc;
return style;
}
function tokenBase(stream, state) {
var ch = stream.next();
if (ch == '"') {
state.tokenize = tokenString;
return state.tokenize(stream, state);
}
if (ch == "'") {
tcat = "atom";
if (stream.eat("\\")) {
if (stream.skipTo("'")) { stream.next(); return "string"; }
else { return "error"; }
} else {
stream.next();
return stream.eat("'") ? "string" : "error";
}
}
if (ch == "/") {
if (stream.eat("/")) { stream.skipToEnd(); return "comment"; }
if (stream.eat("*")) {
state.tokenize = tokenComment(1);
return state.tokenize(stream, state);
}
}
if (ch == "#") {
if (stream.eat("[")) { tcat = "open-attr"; return null; }
stream.eatWhile(/\w/);
return r("macro", "meta");
}
if (ch == ":" && stream.match(":<")) {
return r("op", null);
}
if (ch.match(/\d/) || (ch == "." && stream.eat(/\d/))) {
var flp = false;
if (!stream.match(/^x[\da-f]+/i) && !stream.match(/^b[01]+/)) {
stream.eatWhile(/\d/);
if (stream.eat(".")) { flp = true; stream.eatWhile(/\d/); }
if (stream.match(/^e[+\-]?\d+/i)) { flp = true; }
}
if (flp) stream.match(/^f(?:32|64)/);
else stream.match(/^[ui](?:8|16|32|64)/);
return r("atom", "number");
}
if (ch.match(/[()\[\]{}:;,]/)) return r(ch, null);
if (ch == "-" && stream.eat(">")) return r("->", null);
if (ch.match(operatorChar)) {
stream.eatWhile(operatorChar);
return r("op", null);
}
stream.eatWhile(/\w/);
content = stream.current();
if (stream.match(/^::\w/)) {
stream.backUp(1);
return r("prefix", "variable-2");
}
if (state.keywords.propertyIsEnumerable(content))
return r(state.keywords[content], content.match(/true|false/) ? "atom" : "keyword");
return r("name", "variable");
}
function tokenString(stream, state) {
var ch, escaped = false;
while (ch = stream.next()) {
if (ch == '"' && !escaped) {
state.tokenize = tokenBase;
return r("atom", "string");
}
escaped = !escaped && ch == "\\";
}
// Hack to not confuse the parser when a string is split in
// pieces.
return r("op", "string");
}
function tokenComment(depth) {
return function(stream, state) {
var lastCh = null, ch;
while (ch = stream.next()) {
if (ch == "/" && lastCh == "*") {
if (depth == 1) {
state.tokenize = tokenBase;
break;
} else {
state.tokenize = tokenComment(depth - 1);
return state.tokenize(stream, state);
}
}
if (ch == "*" && lastCh == "/") {
state.tokenize = tokenComment(depth + 1);
return state.tokenize(stream, state);
}
lastCh = ch;
}
return "comment";
};
}
// Parser
var cx = {state: null, stream: null, marked: null, cc: null};
function pass() {
for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
}
function cont() {
pass.apply(null, arguments);
return true;
}
function pushlex(type, info) {
var result = function() {
var state = cx.state;
state.lexical = {indented: state.indented, column: cx.stream.column(),
type: type, prev: state.lexical, info: info};
};
result.lex = true;
return result;
}
function poplex() {
var state = cx.state;
if (state.lexical.prev) {
if (state.lexical.type == ")")
state.indented = state.lexical.indented;
state.lexical = state.lexical.prev;
}
}
function typecx() { cx.state.keywords = typeKeywords; }
function valcx() { cx.state.keywords = valKeywords; }
poplex.lex = typecx.lex = valcx.lex = true;
function commasep(comb, end) {
function more(type) {
if (type == ",") return cont(comb, more);
if (type == end) return cont();
return cont(more);
}
return function(type) {
if (type == end) return cont();
return pass(comb, more);
};
}
function block(type) {
if (type == "}") return cont();
if (type == "let") return cont(pushlex("stat", "let"), letdef1, poplex, block);
if (type == "fn") return cont(pushlex("stat"), fndef, poplex, block);
if (type == "type") return cont(pushlex("stat"), tydef, endstatement, poplex, block);
if (type == "tag") return cont(pushlex("stat"), tagdef, poplex, block);
if (type == "mod") return cont(pushlex("stat"), mod, poplex, block);
if (type == "open-attr") return cont(pushlex("]"), commasep(expression, "]"), poplex);
if (type == "ignore" || type.match(/[\]\);,]/)) return cont(block);
return pass(pushlex("stat"), expression, poplex, endstatement, block);
}
function endstatement(type) {
if (type == ";") return cont();
return pass();
}
function expression(type) {
if (type == "atom" || type == "name") return cont(maybeop);
if (type == "{") return cont(pushlex("}"), exprbrace, poplex);
if (type.match(/[\[\(]/)) return matchBrackets(type, expression);
if (type.match(/[\]\)\};,]/)) return pass();
if (type == "if-style") return cont(expression, expression);
if (type == "else-style" || type == "op") return cont(expression);
if (type == "for") return cont(pattern, maybetype, inop, expression, expression);
if (type == "alt") return cont(expression, altbody);
if (type == "fn") return cont(fndef);
if (type == "macro") return cont(macro);
return cont();
}
function maybeop(type) {
if (content == ".") return cont(maybeprop);
if (content == "::<"){return cont(typarams, maybeop);}
if (type == "op" || content == ":") return cont(expression);
if (type == "(" || type == "[") return matchBrackets(type, expression);
return pass();
}
function maybeprop(type) {
if (content.match(/^\w+$/)) {cx.marked = "variable"; return cont(maybeop);}
return pass(expression);
}
function exprbrace(type) {
if (type == "op") {
if (content == "|") return cont(blockvars, poplex, pushlex("}", "block"), block);
if (content == "||") return cont(poplex, pushlex("}", "block"), block);
}
if (content == "mutable" || (content.match(/^\w+$/) && cx.stream.peek() == ":"
&& !cx.stream.match("::", false))) return pass(recliteral);
return pass(block);
}
function recliteral(type) {
if (content == "mutable" || content == "with") {cx.marked = "keyword"; return cont(recliteral);}
if (content.match(/^\w*$/)) {cx.marked = "variable"; return cont(recliteral);}
if (type == ":") return cont(expression, recliteral);
if (type == "}") return cont();
return cont(recliteral);
}
function blockvars(type) {
if (type == "name") {cx.marked = "def"; return cont(blockvars);}
if (type == "op" && content == "|") return cont();
return cont(blockvars);
}
function letdef1(type) {
if (type == ";") return cont();
if (content == "=") return cont(expression, letdef2);
if (type == ",") return cont(letdef1);
return pass(pattern, maybetype, letdef1);
}
function letdef2(type) {
if (type.match(/[\]\)\};,]/)) return pass(letdef1);
else return pass(expression, letdef2);
}
function maybetype(type) {
if (type == ":") return cont(typecx, rtype, valcx);
return pass();
}
function inop(type) {
if (type == "name" && content == "in") {cx.marked = "keyword"; return cont();}
return pass();
}
function fndef(type) {
if (type == "name") {cx.marked = "def"; return cont(fndef);}
if (content == "<") return cont(typarams, fndef);
if (type == "{") return pass(expression);
if (type == "(") return cont(pushlex(")"), commasep(argdef, ")"), poplex, fndef);
if (type == "->") return cont(typecx, rtype, valcx, fndef);
return cont(fndef);
}
function tydef(type) {
if (type == "name") {cx.marked = "def"; return cont(tydef);}
if (content == "<") return cont(typarams, tydef);
if (content == "=") return cont(typecx, rtype, valcx);
return cont(tydef);
}
function tagdef(type) {
if (type == "name") {cx.marked = "def"; return cont(tagdef);}
if (content == "<") return cont(typarams, tagdef);
if (content == "=") return cont(typecx, rtype, valcx, endstatement);
if (type == "{") return cont(pushlex("}"), typecx, tagblock, valcx, poplex);
return cont(tagdef);
}
function tagblock(type) {
if (type == "}") return cont();
if (type == "(") return cont(pushlex(")"), commasep(rtype, ")"), poplex, tagblock);
if (content.match(/^\w+$/)) cx.marked = "def";
return cont(tagblock);
}
function mod(type) {
if (type == "name") {cx.marked = "def"; return cont(mod);}
if (type == "{") return cont(pushlex("}"), block, poplex);
return pass();
}
function typarams(type) {
if (content == ">") return cont();
if (content == ",") return cont(typarams);
return pass(rtype, typarams);
}
function argdef(type) {
if (type == "name") {cx.marked = "def"; return cont(argdef);}
if (type == ":") return cont(typecx, rtype, valcx);
return pass();
}
function rtype(type) {
if (type == "name") {cx.marked = "variable-3"; return cont(rtypemaybeparam); }
if (content == "mutable") {cx.marked = "keyword"; return cont(rtype);}
if (type == "atom") return cont(rtypemaybeparam);
if (type == "op" || type == "obj") return cont(rtype);
if (type == "fn") return cont(fntype);
return matchBrackets(type, rtype);
}
function rtypemaybeparam(type) {
if (content == "<") return cont(typarams);
return pass();
}
function fntype(type) {
if (type == "(") return cont(pushlex("("), commasep(rtype, ")"), poplex, fntype);
if (type == "->") return cont(rtype);
return pass();
}
function pattern(type) {
if (type == "name") {cx.marked = "def"; return cont(patternmaybeop);}
if (type == "atom") return cont(patternmaybeop);
if (type == "op") return cont(pattern);
if (type.match(/[\]\)\};,]/)) return pass();
return matchBrackets(type, pattern);
}
function patternmaybeop(type) {
if (type == "op" && content == ".") return cont();
if (content == "to") {cx.marked = "keyword"; return cont(pattern);}
else return pass();
}
function altbody(type) {
if (type == "{") return cont(pushlex("}", "alt"), altblock1, poplex);
return pass();
}
function altblock1(type) {
if (type == "}") return cont();
if (type == "|") return cont(altblock1);
if (content == "when") {cx.marked = "keyword"; return cont(expression, altblock2);}
if (type.match(/[\]\);,]/)) return cont(altblock1);
return pass(pattern, altblock2);
}
function altblock2(type) {
if (type == "{") return cont(pushlex("}", "alt"), block, poplex, altblock1);
else return pass(altblock1);
}
function macro(type) {
if (type.match(/[\[\(\{]/)) return matchBrackets(type, expression);
return pass();
}
function matchBrackets(type, comb) {
if (type == "[") return cont(pushlex("]"), commasep(comb, "]"), poplex);
if (type == "(") return cont(pushlex(")"), commasep(comb, ")"), poplex);
if (type == "{") return cont(pushlex("}"), commasep(comb, "}"), poplex);
return cont();
}
function parse(state, stream, style) {
var cc = state.cc;
// Communicate our context to the combinators.
// (Less wasteful than consing up a hundred closures on every call.)
cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc;
while (true) {
var combinator = cc.length ? cc.pop() : block;
if (combinator(tcat)) {
while(cc.length && cc[cc.length - 1].lex)
cc.pop()();
return cx.marked || style;
}
}
}
return {
startState: function() {
return {
tokenize: tokenBase,
cc: [],
lexical: {indented: -indentUnit, column: 0, type: "top", align: false},
keywords: valKeywords,
indented: 0
};
},
token: function(stream, state) {
if (stream.sol()) {
if (!state.lexical.hasOwnProperty("align"))
state.lexical.align = false;
state.indented = stream.indentation();
}
if (stream.eatSpace()) return null;
tcat = content = null;
var style = state.tokenize(stream, state);
if (style == "comment") return style;
if (!state.lexical.hasOwnProperty("align"))
state.lexical.align = true;
if (tcat == "prefix") return style;
if (!content) content = stream.current();
return parse(state, stream, style);
},
indent: function(state, textAfter) {
if (state.tokenize != tokenBase) return 0;
var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical,
type = lexical.type, closing = firstChar == type;
if (type == "stat") return lexical.indented + indentUnit;
if (lexical.align) return lexical.column + (closing ? 0 : 1);
return lexical.indented + (closing ? 0 : (lexical.info == "alt" ? altIndentUnit : indentUnit));
},
electricChars: "{}"
};
});
CodeMirror.defineMIME("text/x-rustsrc", "rust");

View file

@ -252,8 +252,6 @@ Markdown.prototype.toTree = function toTree( source, custom_root ) {
Markdown.prototype.debug = function () { Markdown.prototype.debug = function () {
var args = Array.prototype.slice.call( arguments); var args = Array.prototype.slice.call( arguments);
args.unshift(this.debug_indent); args.unshift(this.debug_indent);
if (typeof print !== "undefined")
print.apply( print, args );
if (typeof console !== "undefined" && typeof console.log !== "undefined") if (typeof console !== "undefined" && typeof console.log !== "undefined")
console.log.apply( null, args ); console.log.apply( null, args );
} }
@ -1125,6 +1123,10 @@ Markdown.dialects.Maruku.block.definition_list = function definition_list( block
return [ list ]; return [ list ];
} }
Markdown.dialects.Maruku.block.html_paragraph = function html_paragraph( block, next ) {
if (block.match(/^<\w/)) return [["RAW", block.toString()]];
}
Markdown.dialects.Maruku.inline[ "{:" ] = function inline_meta( text, matches, out ) { Markdown.dialects.Maruku.inline[ "{:" ] = function inline_meta( text, matches, out ) {
if ( !out.length ) { if ( !out.length ) {
return [ 2, "{:" ]; return [ 2, "{:" ];
@ -1297,6 +1299,7 @@ function render_tree( jsonml ) {
var tag = jsonml.shift(), var tag = jsonml.shift(),
attributes = {}, attributes = {},
content = []; content = [];
if (tag == "RAW") return jsonml[0];
if ( jsonml.length && typeof jsonml[ 0 ] === "object" && !( jsonml[ 0 ] instanceof Array ) ) { if ( jsonml.length && typeof jsonml[ 0 ] === "object" && !( jsonml[ 0 ] instanceof Array ) ) {
attributes = jsonml.shift(); attributes = jsonml.shift();

View file

@ -1,7 +1,5 @@
# Syntax Basics # Syntax Basics
FIXME: mention the module separator `::` somewhere
## Braces ## Braces
Assuming you've programmed in any C-family language (C++, Java, Assuming you've programmed in any C-family language (C++, Java,
@ -75,6 +73,19 @@ only have a trailing expression when you want to use their value for
something—in which case you'll have embedded it in a bigger statement, something—in which case you'll have embedded it in a bigger statement,
like the `let x = ...` example above. like the `let x = ...` example above.
## Identifiers
Rust identifiers must start with an alphabetic character or an
underscore, and after that may contain any alphanumeric character, and
more underscores.
NOTE: The parser doesn't currently recognize non-ascii alphabetic
characters. This is a bug that will eventually be fixed.
The double-colon (`::`) is used as a module separator, so
`std::io::println` means 'the thing named `println` in the module
named `io` in the module named `std`'.
## Types ## Types
The `-> bool` in the last example is the way a function's return type The `-> bool` in the last example is the way a function's return type
@ -158,10 +169,10 @@ Types can be given names with `type` declarations:
This will provide a synonym, `monster_size`, for unsigned integers. It This will provide a synonym, `monster_size`, for unsigned integers. It
will not actually create a new type—`monster_size` and `uint` can be will not actually create a new type—`monster_size` and `uint` can be
used interchangeably, and using one where the other is expected is not used interchangeably, and using one where the other is expected is not
a type error. Read about [single-variant tags][svt] in the next a type error. Read about [single-variant tags][svt] further on if you
section if you need to create a type name that's not just a synonym. need to create a type name that's not just a synonym.
[svt]: FIXME [svt]: data.html#single_variant_tag
## Literals ## Literals
@ -211,4 +222,37 @@ following it, will not appear in the resulting string literal.
## Operators ## Operators
FIXME recap C-style operators, ?:, explain `as` Rust's set of operators contains very few surprises. The main
difference with C is that `++` and `--` are missing, and that the
logical binary operators have higher precedence—in C, `x & 2 > 0`
comes out as `x & (2 > 0)`, in Rust, it means `(x & 2) > 0`, which is
more likely to be what you expect (unless you are a C veteran).
Thus, binary arithmetic is done with `*`, `/`, `%`, `+`, and `-`
(multiply, divide, remainder, plus, minus). `-` is also a unary prefix
operator (there are no unary postfix operators in Rust) that does
negation.
Binary shifting is done with `>>` (shift right), `>>>` (arithmetic
shift right), and `<<` (shift left). Logical bitwise operators are
`&`, `|`, and `^` (and, or, and exclusive or), and unary `!` for
bitwise negation (or boolean negation when applied to a boolean
value).
The comparison operators are the traditional `==`, `!=`, `<`, `>`,
`<=`, and `>=`. Short-circuiting (lazy) boolean operators are written
`&&` (and) and `||` (or).
Rust has a ternary conditional operator `?:`, as in:
let message = badness < 10 ? "error" : "FATAL ERROR";
For type casting, Rust uses the binary `as` operator, which has a
precedence between the bitwise combination operators (`&`, `|`, `^`)
and the comparison operators. It takes an expression on the left side,
and a type on the right side, and will, if a meaningful conversion
exists, convert the result of the expression to the given type.
let x: float = 4.0;
let y: uint = x as uint;
assert y == 4u;

View file

@ -0,0 +1,19 @@
.cm-s-default span.cm-keyword {color: #708;}
.cm-s-default span.cm-atom {color: #219;}
.cm-s-default span.cm-number {color: #164;}
.cm-s-default span.cm-def {color: #00f;}
.cm-s-default span.cm-variable {color: black;}
.cm-s-default span.cm-variable-2 {color: #05a;}
.cm-s-default span.cm-variable-3 {color: #0a5;}
.cm-s-default span.cm-property {color: black;}
.cm-s-default span.cm-operator {color: black;}
.cm-s-default span.cm-comment {color: #a50;}
.cm-s-default span.cm-string {color: #a11;}
.cm-s-default span.cm-string-2 {color: #f50;}
.cm-s-default span.cm-meta {color: #555;}
.cm-s-default span.cm-error {color: #f00;}
.cm-s-default span.cm-qualifier {color: #555;}
.cm-s-default span.cm-builtin {color: #30a;}
.cm-s-default span.cm-bracket {color: #cc7;}
.cm-s-default span.cm-tag {color: #170;}
.cm-s-default span.cm-attribute {color: #00c;}

View file

@ -18,9 +18,8 @@ code {
} }
pre { pre {
margin: 1.1em 12px; margin: 1.1em 0;
border: 1px solid #CCCCCC; padding: .4em .4em .4em 1em;
padding: .4em;
font-size: 120%; font-size: 120%;
} }