1 files changed, 134 insertions, 0 deletions
diff --git a/lib/output.js b/lib/output.js
new file mode 100644
index 00000000..2c4c6fdc
--- /dev/null
+++ b/lib/output.js
@@ -0,0 +1,134 @@
+function OutputStream(options) {
+    options = defaults(options, {
+        indent_start  : 0,
+        indent_level  : 4,
+        quote_keys    : false,
+        space_colon   : false,
+        beautify      : true,
+        ascii_only    : false,
+        inline_script : false,
+        width         : 80
+    });
+
+    var indentation = 0;
+    var current_col = 0;
+    var OUTPUT = "";
+
+    function to_ascii(str) {
+        return str.replace(/[\u0080-\uffff]/g, function(ch) {
+            var code = ch.charCodeAt(0).toString(16);
+            while (code.length < 4) code = "0" + code;
+            return "\\u" + code;
+        });
+    };
+
+    function make_string(str) {
+        var dq = 0, sq = 0;
+        str = str.replace(/[\\\b\f\n\r\t\x22\x27\u2028\u2029\0]/g, function(s){
+            switch (s) {
+              case "\\": return "\\\\";
+              case "\b": return "\\b";
+              case "\f": return "\\f";
+              case "\n": return "\\n";
+              case "\r": return "\\r";
+              case "\u2028": return "\\u2028";
+              case "\u2029": return "\\u2029";
+              case '"': ++dq; return '"';
+              case "'": ++sq; return "'";
+              case "\0": return "\\0";
+            }
+            return s;
+        });
+        if (options.ascii_only) str = to_ascii(str);
+        if (dq > sq) return "'" + str.replace(/\x27/g, "\\'") + "'";
+        else return '"' + str.replace(/\x22/g, '\\"') + '"';
+    };
+
+    function print(str) {
+        var nl = str.lastIndexOf("\n");
+        if (nl >= 0) {
+            current_col = nl;
+        } else {
+            current_col += str.length;
+        }
+        OUTPUT += str;
+    };
+
+    function encode_string(str) {
+        var ret = make_string(str);
+        if (options.inline_script)
+            ret = ret.replace(/<\x2fscript([>\/\t\n\f\r ])/gi, "<\\/script$1");
+        return ret;
+    };
+
+    function make_name(name) {
+        name = name.toString();
+        if (options.ascii_only)
+            name = to_ascii(name);
+        return name;
+    };
+
+    function make_indent(line) {
+        if (line == null)
+            line = "";
+        if (beautify)
+            line = repeat_string(" ", options.indent_start + indentation) + line;
+        return line;
+    };
+
+    function with_indent(col, cont) {
+        var save_indentation = indentation;
+        indentation = col;
+        var ret = cont();
+        indentation = save_indentation;
+        return ret;
+    };
+
+    function indent() {
+        if (options.beautify) print(make_indent());
+    };
+
+    function newline() {
+        if (options.beautify) {
+            print("\n");
+            print(make_indent());
+        }
+    };
+
+    function next_indent() {
+        return indentation + options.indent_level;
+    };
+
+    function with_block(cont) {
+        var ret;
+        print("{");
+        with_indent(next_indent(), function(){
+            newline();
+            ret = cont();
+            newline();
+        });
+        indent();
+        print("}");
+        return ret;
+    };
+
+    function with_parens(cont) {
+        print("(");
+        var ret = with_indent(current_col, cont);
+        print(")");
+        return ret;
+    };
+
+    return {
+        get         : function() { return OUTPUT },
+        indent      : indent,
+        newline     : newline,
+        print       : print,
+        string      : function(str) { print(encode_string(str)) },
+        with_indent : with_indent,
+        with_block  : with_block,
+        with_parens : with_parens,
+        options     : function() { return options }
+    };
+
+};