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Initial work on multiline repl.
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@joneshf
joneshf committed Aug 8, 2013
1 parent fc94e73 commit 8e6e42c
Showing 1 changed file with 77 additions and 56 deletions.
133 changes: 77 additions & 56 deletions src/node-repl.js
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Expand Up @@ -49,6 +49,15 @@ var getFileContents = function(filename) {
return source;
};

var colorLog = function(color) {
var args = [].slice.call(arguments, 1);

args[0] = '\u001b[' + color + 'm' + args[0];
args[args.length - 1] = args[args.length - 1] + '\u001b[0m';

console.log.apply(console, args);
};

var nodeRepl = function(opts) {
var readline = require('readline'),
path = require('path'),
Expand All @@ -63,21 +72,14 @@ var nodeRepl = function(opts) {
var sources = {};
var aliases = {};
var sandbox = getSandbox();
var block = [];
var inBlock = false;

// Prologue
console.log("Roy: " + opts.info.description);
console.log(opts.info.author);
console.log(":? for help");

var colorLog = function(color) {
var args = [].slice.call(arguments, 1);

args[0] = '\u001b[' + color + 'm' + args[0];
args[args.length - 1] = args[args.length - 1] + '\u001b[0m';

console.log.apply(console, args);
};

// Include the standard library
var fs = require('fs');
var prelude = fs.readFileSync(path.dirname(__dirname) + '/lib/prelude.roy', 'utf8');
Expand All @@ -100,52 +102,25 @@ var nodeRepl = function(opts) {
// e.g. ":q" or ":l test.roy"
var metacommand = line.replace(/^\s+/, '').split(' ');
try {
switch(metacommand[0]) {
case ":q":
// Exit
process.exit();
break;
case ":l":
// Load
filename = metacommand[1];
source = getFileContents(filename);
compiled = compile(source, env, aliases, {nodejs: true, filename: ".", run: true});
break;
case ":t":
if(metacommand[1] in env) {
console.log(env[metacommand[1]].toString());
} else {
colorLog(33, metacommand[1], "is not defined.");
}
break;
case ":s":
// Source
if(sources[metacommand[1]]) {
colorLog(33, metacommand[1], "=", prettyPrint(sources[metacommand[1]]));
} else {
if(metacommand[1]){
colorLog(33, metacommand[1], "is not defined.");
}else{
console.log("Usage :s command ");
console.log(":s [identifier] :: show original code about identifier.");
}
}
break;
case ":?":
// Help
colorLog(32, "Commands available from the prompt");
console.log(":l -- load and run an external file");
console.log(":q -- exit REPL");
console.log(":s -- show original code about identifier");
console.log(":t -- show the type of the identifier");
console.log(":? -- show help");
break;
default:
// The line isn't a metacommand

// Remember the source if it's a binding
tokens = lexer.tokenise(line);
if (/:/.test(metacommand[0])) {
processMetacommand(metacommand);
} else if (/(=|->)\s*$/.test(line)) {
// A block is starting.
inBlock = true;
block.push(line);
repl.setPrompt('.... ');
} else if (inBlock && /\S/.test(line)) {
block.push(' ' + line);
} else if (!inBlock || (inBlock && /^\s*$/.test(line))) {
// End of a block.
inBlock = false;
repl.setPrompt('roy> ');
block.push(line);
joined = block.join('\n');
block = [];
tokens = lexer.tokenise(joined);
ast = parser.parse(tokens);
// Remember the source if it's a binding
if (typeof ast.body[0] != 'undefined') {
ast.body[0].accept({
// Simple bindings.
Expand All @@ -162,8 +137,7 @@ var nodeRepl = function(opts) {
}

// Just eval it
compiled = compile(line, env, aliases, {nodejs: true, filename: ".", run: true});
break;
compiled = compile(joined, env, aliases, {nodejs: true, filename: ".", run: true});
}

if(compiled) {
Expand All @@ -175,6 +149,7 @@ var nodeRepl = function(opts) {
}
} catch(e) {
colorLog(31, (e.stack || e.toString()));
block = [];
}
repl.prompt();
});
Expand Down Expand Up @@ -370,6 +345,52 @@ var processFlags = function(argv, opts) {
processFlags(argv, opts);
};

var processMetacommand = function(commands) {
switch(commands[0]) {
case ":q":
// Exit
process.exit();
break;
case ":l":
// Load
filename = commands[1];
source = getFileContents(filename);
compiled = compile(source, env, aliases, {nodejs: true, filename: ".", run: true});
break;
case ":t":
if(commands[1] in env) {
console.log(env[commands[1]].toString());
} else {
colorLog(33, commands[1], "is not defined.");
}
break;
case ":s":
// Source
if(sources[commands[1]]) {
colorLog(33, commands[1], "=", prettyPrint(sources[commands[1]]));
} else {
if(commands[1]){
colorLog(33, commands[1], "is not defined.");
}else{
console.log("Usage :s command ");
console.log(":s [identifier] :: show original code about identifier.");
}
}
break;
case ":?":
// Fall through to help.
default:
// Help
colorLog(32, "Commands available from the prompt");
console.log(":l -- load and run an external file");
console.log(":q -- exit REPL");
console.log(":s -- show original code about identifier");
console.log(":t -- show the type of the identifier");
console.log(":? -- show help");
break;
}
};

var main = function() {
var argv = process.argv.slice(2);

Expand Down

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