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@@ -1,15 +1,15 @@ | ||
haskell.abs.Program = function() { | ||
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}; | ||
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haskell.abs.Statement = function() { | ||
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}; | ||
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haskell.abs.Expression = function() { | ||
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}; | ||
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haskell.abs.Value = function() { | ||
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haskell.abs.Program = function() { | ||
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}; | ||
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haskell.abs.Statement = function() { | ||
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}; | ||
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haskell.abs.Expression = function() { | ||
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}; | ||
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haskell.abs.Value = function() { | ||
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} |
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@@ -1,68 +1,68 @@ | ||
function isInteger(x) { | ||
var y = parseInt(x); | ||
if (isNaN(y)) { | ||
return false; | ||
} | ||
return x== y && x.toString() == y.toString(); | ||
} | ||
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haskell.interpreter.interpret = function(env, ast) { | ||
var interpret = haskell.interpreter.interpret; | ||
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if(ast.fun_name != undefined) { | ||
// eval function | ||
var f = env.get_symbol(ast.fun_name); | ||
env.set_arg_list(ast.arguments); | ||
var result = interpret(env, f.value); | ||
return result; | ||
} else if (ast.arguments != undefined) { | ||
for (var i = 0; i < ast.arguments.length; i++) { | ||
var arg = ast.arguments[i]; | ||
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if (env.arg_list.length > i) { | ||
var value = env.arg_list[i]; | ||
value = value.toString(); | ||
value = haskell.parser.parse(value, true).ast; | ||
env.set_symbol(arg, value, false); | ||
} else if (!env.exists_symbol(arg)) { | ||
var value = prompt("enter a value for " + arg); | ||
value = haskell.parser.parse(value, false).ast; | ||
env.set_symbol(arg, value, false); | ||
} | ||
} | ||
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return interpret(env, ast.expr); | ||
} else if (ast.symbol != undefined) { | ||
switch (ast.symbol) { | ||
case '+': | ||
return interpret(env, ast.lhs) + interpret(env, ast.rhs); | ||
break; | ||
case '-': | ||
return interpret(env, ast.lhs) - interpret(env, ast.rhs); | ||
break; | ||
case '*': | ||
return interpret(env, ast.lhs) * interpret(env, ast.rhs); | ||
break; | ||
case '/': | ||
return interpret(env, ast.lhs) / interpret(env, ast.rhs); | ||
break; | ||
default: | ||
console.log("unknown symbol %o ast: %o", ast.symbol, ast); | ||
break; | ||
} | ||
} else { | ||
if (isInteger(ast)) { | ||
return ast; | ||
} else { | ||
// ast is a symbol so look it up | ||
var symbol = env.get_symbol(ast); | ||
if (symbol.evaluated) { | ||
return symbol.value; | ||
} else { | ||
var result = interpret(new haskell.env(), symbol.value); | ||
env.set_symbol(ast, result, true); | ||
return result; | ||
} | ||
} | ||
} | ||
function isInteger(x) { | ||
var y = parseInt(x); | ||
if (isNaN(y)) { | ||
return false; | ||
} | ||
return x== y && x.toString() == y.toString(); | ||
} | ||
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haskell.interpreter.interpret = function(env, ast) { | ||
var interpret = haskell.interpreter.interpret; | ||
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if(ast.fun_name != undefined) { | ||
// eval function | ||
var f = env.get_symbol(ast.fun_name); | ||
env.set_arg_list(ast.arguments); | ||
var result = interpret(env, f.value); | ||
return result; | ||
} else if (ast.arguments != undefined) { | ||
for (var i = 0; i < ast.arguments.length; i++) { | ||
var arg = ast.arguments[i]; | ||
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if (env.arg_list.length > i) { | ||
var value = env.arg_list[i]; | ||
value = value.toString(); | ||
value = haskell.parser.parse(value, true).ast; | ||
env.set_symbol(arg, value, false); | ||
} else if (!env.exists_symbol(arg)) { | ||
var value = prompt("enter a value for " + arg); | ||
value = haskell.parser.parse(value, false).ast; | ||
env.set_symbol(arg, value, false); | ||
} | ||
} | ||
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return interpret(env, ast.expr); | ||
} else if (ast.symbol != undefined) { | ||
switch (ast.symbol) { | ||
case '+': | ||
return interpret(env, ast.lhs) + interpret(env, ast.rhs); | ||
break; | ||
case '-': | ||
return interpret(env, ast.lhs) - interpret(env, ast.rhs); | ||
break; | ||
case '*': | ||
return interpret(env, ast.lhs) * interpret(env, ast.rhs); | ||
break; | ||
case '/': | ||
return interpret(env, ast.lhs) / interpret(env, ast.rhs); | ||
break; | ||
default: | ||
console.log("unknown symbol %o ast: %o", ast.symbol, ast); | ||
break; | ||
} | ||
} else { | ||
if (isInteger(ast)) { | ||
return ast; | ||
} else { | ||
// ast is a symbol so look it up | ||
var symbol = env.get_symbol(ast); | ||
if (symbol.evaluated) { | ||
return symbol.value; | ||
} else { | ||
var result = interpret(new haskell.env(), symbol.value); | ||
env.set_symbol(ast, result, true); | ||
return result; | ||
} | ||
} | ||
} | ||
} |
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