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app.js
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app.js
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function Parser(line) {
return {
ndx: 0,
tokens: line.split(/ +/).filter(function (t) { return t != ""; }),
curToken: function () { return this.tokens[this.ndx] },
nextToken: function () { return this.tokens[this.ndx++] },
hasTokens: function () { return this.ndx < this.tokens.length }
}
}
function evaluate(tokens, state) {
tokens.map(function (tok) {
if (typeof(tok) === "number" || typeof(tok) === "string") {
state = state.change('stk', function (stk) { return stk.unshift(tok) })
}
else if (typeof(tok) === "function") {
state = tok.call(null, state)
}
})
return state
}
function parseWord(word, parser, tokens, state) {
if (word.match(/^[+-]?\d+(\.\d+)?(e\d+)?$/)) {
tokens.push(parseFloat(word))
}
else if (nsLookup(state, word) && nsLookup(state, word).immediate) {
state = nsLookup(state, word).call(null, parser, state, tokens)
}
else if (nsLookup(state, word)) {
tokens.push(nsLookup(state, word))
}
else {
tokens.push(word) // Unknown words? -> string
}
return {parser: parser, tokens: tokens, state: state}
}
function nsLookup(state, word) {
for (ns = state.get('ns'); ns != null; ns = ns.get('_parent')) {
if (ns.get(word) !== null) {
return ns.get(word);
}
}
}
function parseAndEval(line, state) {
var parser = new Parser(line)
var tokens = []
while (parser.hasTokens()) {
result = parseWord(parser.nextToken(), parser, tokens, state)
state = result.state
}
return evaluate(tokens, state)
}
Immutable.Map.prototype.change = function (key, mutator) {
return this.set(key, mutator(this.get(key)))
}
Immutable.Map.prototype.first = function (key) {
return this.get('stk').get(0)
}
Immutable.Map.prototype.second = function (key) {
return this.get('stk').get(1)
}
function initState() {
var binary = function (op) { // ( a b -- c )
return function (state) {
return state.change('stk', function (stk) {
stk = stk.skip(2).toVector()
return stk.unshift(op(state.first(), state.second()))
})
}
}
var parseUntil = function (endTok, parser, state) {
var tokens = []
while (parser.hasTokens() && parser.curToken() !== endTok) {
parseWord(parser.nextToken(), parser, tokens, state)
} // TODO: check for end of input & err
parser.nextToken() // throw away the end token
return tokens
}
var immediate = function(word) {
word.immediate = true;
return word;
}
// SO REALLY these need to be f(state) -> (state')
return Immutable.Map({
"stk": Immutable.Vector(), // the datastack
"ns": Immutable.Map({
"+": binary(function (a,b) {return b+a}), // these belong at the bottom of the namestack
"-": binary(function (a,b) {return b-a}),
"*": binary(function (a,b) {return b*a}),
"/": binary(function (a,b) {return b/a}),
dup: function (state) {
return state.change('stk', function (stk) { return stk.unshift(state.first()) })
},
swap: function (state) {
return state.change('stk', function (stk) {
return stk.skip(2).toVector().unshift(state.first()).unshift(state.second())
})
},
drop: function (state) {
return state.change('stk', function (stk) {
return stk.skip(1).toVector();
});
},
cells: Immutable.Map(),
let: immediate(function (parser, state) { // TODO, these should modify namespace and return changed state
var varName = parser.nextToken()
return state.change('ns', function (ns) {
var cell = varName + '_cell';
ns = ns.set(cell, 0.0);
ns = ns.change('cells', function (cells) {
return cells.set(varName, cell);
});
ns = ns.set(varName, function (state) {
return state.change('stk', function (stk) {
return stk.unshift(nsLookup(state, cell))
})
})
return ns.set('>' + varName, function (state) {
var first = state.first()
state = state.change('ns', function (ns) {
return ns.set(cell, first)
})
return state.change('stk', function (stk) {
return stk.skip(1).toVector()
});
})
})
}),
":": immediate(function (parser, state) {
var name = parser.nextToken()
var tokens = tokens = parseUntil(';', parser, state)
return state.change('ns', function (ns) {
return ns.set(name, function (stk) {
return evaluate(tokens, stk)
})
});
}),
loop: immediate(function (parser, state, tokens) {
var loopBody = parseUntil('end', parser, state)
tokens.push(function (state) {
var end = state.first(), ndx = state.second()
state = state.change('stk', function (stk) { // Consume vars from stack
stk = stk.skip(2).toVector()
return stk;
});
while (ndx < end) {
state = state.set('i', function () { return ndx });
state = evaluate(loopBody, state)
ndx++
}
return state
})
return state
}),
"IN:": immediate(function (parser, state) {
return state.set('bufname', parser.nextToken())
})
})
});
}
function calcLines(str) {
var lines = (str === "" || !str ? [] : str.split('\n'))
var total = 0
var state = initState()
var result = lines.map(function (line) {
try {
state = parseAndEval(line, state)
var value = state.get('stk').toJS()
state = state.set('stk', Immutable.Vector())
if (value !== undefined && value.length == 1) {
var ans = value[0]
if (isNaN(ans)) {
return ans.toString()
}
else if (typeof(ans) == "number") {
total += ans
return ans
}
}
return (value && value.length == 0 ? '' : JSON.stringify(value))
}
catch (err) {
console.log(err, "While evaluating '" + line + "'")
return "#err"
}
})
var ns = state.get('ns')
state = state.toJS()
return {
result: result,
total: total,
cells: ns.get('cells').map(function (cell) {
return ns.get(cell)
}).toJS(),
bufname: state.bufname
}
}
// belongs in a 'budget' vocab
// let$: function (parser, state) {
// while (parser.hasTokens()) {
// var name = state.immediate.let(parser, state) // TODO: fix, this is busted
//
// var cls = function (varName) {
// var goal = parser.nextToken()
//
// var getter = state.cells.__lookupGetter__(varName)
// state.cells.__defineGetter__(varName, function () { return {'val': getter(), 'goal': goal, 'toString': function () { return this.val + '/' + this.goal } } })
// }
// cls(name)
// }
// return state
// },