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function js_beautify(js_source_text, indent_size, indent_character, indent_level)
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{
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var input, output, token_text, last_type, last_text, last_word, current_mode, modes, indent_string;
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var whitespace, wordchar, punct, parser_pos, line_starters, in_case;
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var prefix, token_type, do_block_just_closed, var_line, var_line_tainted;
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function trim_output()
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{
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while (output.length && (output[output.length - 1] === ' ' || output[output.length - 1] === indent_string)) {
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output.pop();
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}
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}
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function print_newline(ignore_repeated)
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{
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ignore_repeated = typeof ignore_repeated === 'undefined' ? true: ignore_repeated;
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trim_output();
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if (!output.length) {
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return; // no newline on start of file
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}
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if (output[output.length - 1] !== "\n" || !ignore_repeated) {
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output.push("\n");
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}
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for (var i = 0; i < indent_level; i++) {
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output.push(indent_string);
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}
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}
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function print_space()
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{
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var last_output = output.length ? output[output.length - 1] : ' ';
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if (last_output !== ' ' && last_output !== '\n' && last_output !== indent_string) { // prevent occassional duplicate space
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output.push(' ');
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}
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}
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function print_token()
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{
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output.push(token_text);
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}
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function indent()
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{
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indent_level++;
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}
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function unindent()
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{
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if (indent_level) {
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indent_level--;
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}
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}
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function remove_indent()
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{
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if (output.length && output[output.length - 1] === indent_string) {
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output.pop();
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}
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}
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function set_mode(mode)
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{
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modes.push(current_mode);
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current_mode = mode;
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}
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function restore_mode()
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{
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do_block_just_closed = current_mode === 'DO_BLOCK';
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current_mode = modes.pop();
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}
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function in_array(what, arr)
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{
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for (var i = 0; i < arr.length; i++)
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{
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if (arr[i] === what) {
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return true;
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}
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}
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return false;
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}
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function get_next_token()
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{
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var n_newlines = 0;
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var c = '';
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do {
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if (parser_pos >= input.length) {
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return ['', 'TK_EOF'];
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}
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c = input.charAt(parser_pos);
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parser_pos += 1;
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if (c === "\n") {
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n_newlines += 1;
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}
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}
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while (in_array(c, whitespace));
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if (n_newlines > 1) {
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for (var i = 0; i < 2; i++) {
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print_newline(i === 0);
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}
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}
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var wanted_newline = (n_newlines === 1);
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if (in_array(c, wordchar)) {
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if (parser_pos < input.length) {
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while (in_array(input.charAt(parser_pos), wordchar)) {
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c += input.charAt(parser_pos);
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parser_pos += 1;
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if (parser_pos === input.length) {
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break;
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}
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}
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}
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// small and surprisingly unugly hack for 1E-10 representation
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if (parser_pos !== input.length && c.match(/^[0-9]+[Ee]$/) && input.charAt(parser_pos) === '-') {
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parser_pos += 1;
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var t = get_next_token(parser_pos);
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c += '-' + t[0];
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return [c, 'TK_WORD'];
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}
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if (c === 'in') { // hack for 'in' operator
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return [c, 'TK_OPERATOR'];
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}
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return [c, 'TK_WORD'];
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}
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if (c === '(' || c === '[') {
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return [c, 'TK_START_EXPR'];
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}
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if (c === ')' || c === ']') {
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return [c, 'TK_END_EXPR'];
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}
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if (c === '{') {
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return [c, 'TK_START_BLOCK'];
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}
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if (c === '}') {
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return [c, 'TK_END_BLOCK'];
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}
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if (c === ';') {
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return [c, 'TK_END_COMMAND'];
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}
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if (c === '/') {
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var comment = '';
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// peek for comment /* ... */
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if (input.charAt(parser_pos) === '*') {
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parser_pos += 1;
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if (parser_pos < input.length) {
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while (! (input.charAt(parser_pos) === '*' && input.charAt(parser_pos + 1) && input.charAt(parser_pos + 1) === '/') && parser_pos < input.length) {
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comment += input.charAt(parser_pos);
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parser_pos += 1;
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if (parser_pos >= input.length) {
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break;
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}
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}
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}
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parser_pos += 2;
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return ['/*' + comment + '*/', 'TK_BLOCK_COMMENT'];
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}
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// peek for comment // ...
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if (input.charAt(parser_pos) === '/') {
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comment = c;
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while (input.charAt(parser_pos) !== "\x0d" && input.charAt(parser_pos) !== "\x0a") {
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comment += input.charAt(parser_pos);
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parser_pos += 1;
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if (parser_pos >= input.length) {
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break;
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}
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}
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parser_pos += 1;
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if (wanted_newline) {
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print_newline();
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}
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return [comment, 'TK_COMMENT'];
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}
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}
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if (c === "'" || // string
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c === '"' || // string
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(c === '/' &&
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((last_type === 'TK_WORD' && last_text === 'return') || (last_type === 'TK_START_EXPR' || last_type === 'TK_END_BLOCK' || last_type === 'TK_OPERATOR' || last_type === 'TK_EOF' || last_type === 'TK_END_COMMAND')))) { // regexp
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var sep = c;
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var esc = false;
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c = '';
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if (parser_pos < input.length) {
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while (esc || input.charAt(parser_pos) !== sep) {
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c += input.charAt(parser_pos);
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if (!esc) {
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esc = input.charAt(parser_pos) === '\\';
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} else {
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esc = false;
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}
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parser_pos += 1;
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if (parser_pos >= input.length) {
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break;
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}
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}
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}
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parser_pos += 1;
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if (last_type === 'TK_END_COMMAND') {
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print_newline();
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}
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return [sep + c + sep, 'TK_STRING'];
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}
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if (in_array(c, punct)) {
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while (parser_pos < input.length && in_array(c + input.charAt(parser_pos), punct)) {
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c += input.charAt(parser_pos);
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parser_pos += 1;
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if (parser_pos >= input.length) {
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break;
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}
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}
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return [c, 'TK_OPERATOR'];
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}
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return [c, 'TK_UNKNOWN'];
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}
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//----------------------------------
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indent_character = indent_character || ' ';
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indent_size = indent_size || 4;
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indent_string = '';
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while (indent_size--) {
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indent_string += indent_character;
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}
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input = js_source_text;
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last_word = ''; // last 'TK_WORD' passed
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last_type = 'TK_START_EXPR'; // last token type
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last_text = ''; // last token text
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output = [];
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do_block_just_closed = false;
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var_line = false;
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var_line_tainted = false;
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whitespace = "\n\r\t ".split('');
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wordchar = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$'.split('');
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punct = '+ - * / % & ++ -- = += -= *= /= %= == === != !== > < >= <= >> << >>> >>>= >>= <<= && &= | || ! !! , : ? ^ ^= |='.split(' ');
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// words which should always start on new line.
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line_starters = 'continue,try,throw,return,var,if,switch,case,default,for,while,break,function'.split(',');
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// states showing if we are currently in expression (i.e. "if" case) - 'EXPRESSION', or in usual block (like, procedure), 'BLOCK'.
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// some formatting depends on that.
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current_mode = 'BLOCK';
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modes = [current_mode];
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indent_level = indent_level || 0;
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parser_pos = 0; // parser position
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in_case = false; // flag for parser that case/default has been processed, and next colon needs special attention
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while (true) {
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var t = get_next_token(parser_pos);
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token_text = t[0];
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token_type = t[1];
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if (token_type === 'TK_EOF') {
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break;
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}
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switch (token_type) {
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case 'TK_START_EXPR':
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var_line = false;
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set_mode('EXPRESSION');
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if (last_type === 'TK_END_EXPR' || last_type === 'TK_START_EXPR') {
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// do nothing on (( and )( and ][ and ]( ..
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} else if (last_type !== 'TK_WORD' && last_type !== 'TK_OPERATOR') {
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print_space();
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} else if (in_array(last_word, line_starters) && last_word !== 'function') {
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print_space();
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}
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print_token();
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break;
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case 'TK_END_EXPR':
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print_token();
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restore_mode();
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break;
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case 'TK_START_BLOCK':
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if (last_word === 'do') {
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set_mode('DO_BLOCK');
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} else {
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set_mode('BLOCK');
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}
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if (last_type !== 'TK_OPERATOR' && last_type !== 'TK_START_EXPR') {
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if (last_type === 'TK_START_BLOCK') {
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print_newline();
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} else {
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print_space();
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}
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}
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print_token();
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indent();
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break;
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case 'TK_END_BLOCK':
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if (last_type === 'TK_START_BLOCK') {
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// nothing
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trim_output();
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unindent();
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} else {
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unindent();
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print_newline();
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}
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print_token();
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restore_mode();
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break;
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case 'TK_WORD':
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if (do_block_just_closed) {
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print_space();
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print_token();
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print_space();
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break;
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}
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if (token_text === 'case' || token_text === 'default') {
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if (last_text === ':') {
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// switch cases following one another
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remove_indent();
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} else {
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// case statement starts in the same line where switch
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unindent();
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print_newline();
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indent();
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}
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print_token();
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in_case = true;
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break;
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}
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prefix = 'NONE';
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if (last_type === 'TK_END_BLOCK') {
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if (!in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
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prefix = 'NEWLINE';
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} else {
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prefix = 'SPACE';
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print_space();
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}
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} else if (last_type === 'TK_END_COMMAND' && (current_mode === 'BLOCK' || current_mode === 'DO_BLOCK')) {
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prefix = 'NEWLINE';
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} else if (last_type === 'TK_END_COMMAND' && current_mode === 'EXPRESSION') {
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prefix = 'SPACE';
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} else if (last_type === 'TK_WORD') {
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prefix = 'SPACE';
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} else if (last_type === 'TK_START_BLOCK') {
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prefix = 'NEWLINE';
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} else if (last_type === 'TK_END_EXPR') {
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print_space();
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prefix = 'NEWLINE';
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}
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if (last_type !== 'TK_END_BLOCK' && in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
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print_newline();
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} else if (in_array(token_text, line_starters) || prefix === 'NEWLINE') {
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if (last_text === 'else') {
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// no need to force newline on else break
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print_space();
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} else if ((last_type === 'TK_START_EXPR' || last_text === '=') && token_text === 'function') {
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// no need to force newline on 'function': (function
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// DONOTHING
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} else if (last_type === 'TK_WORD' && (last_text === 'return' || last_text === 'throw')) {
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// no newline between 'return nnn'
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print_space();
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} else if (last_type !== 'TK_END_EXPR') {
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if ((last_type !== 'TK_START_EXPR' || token_text !== 'var') && last_text !== ':') {
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// no need to force newline on 'var': for (var x = 0...)
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if (token_text === 'if' && last_type === 'TK_WORD' && last_word === 'else') {
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// no newline for } else if {
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print_space();
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} else {
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print_newline();
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}
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}
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} else {
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if (in_array(token_text, line_starters) && last_text !== ')') {
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print_newline();
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}
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}
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} else if (prefix === 'SPACE') {
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print_space();
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}
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print_token();
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last_word = token_text;
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if (token_text === 'var') {
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var_line = true;
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var_line_tainted = false;
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}
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break;
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case 'TK_END_COMMAND':
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print_token();
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var_line = false;
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break;
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case 'TK_STRING':
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if (last_type === 'TK_START_BLOCK' || last_type === 'TK_END_BLOCK') {
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print_newline();
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} else if (last_type === 'TK_WORD') {
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print_space();
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}
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print_token();
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break;
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case 'TK_OPERATOR':
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var start_delim = true;
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var end_delim = true;
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if (var_line && token_text !== ',') {
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var_line_tainted = true;
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if (token_text === ':') {
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var_line = false;
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}
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}
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if (token_text === ':' && in_case) {
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print_token(); // colon really asks for separate treatment
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print_newline();
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break;
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}
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in_case = false;
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if (token_text === ',') {
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if (var_line) {
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if (var_line_tainted) {
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print_token();
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print_newline();
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var_line_tainted = false;
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} else {
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print_token();
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print_space();
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}
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} else if (last_type === 'TK_END_BLOCK') {
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print_token();
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print_newline();
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} else {
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if (current_mode === 'BLOCK') {
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print_token();
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print_newline();
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} else {
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// EXPR od DO_BLOCK
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print_token();
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print_space();
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}
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}
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break;
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} else if (token_text === '--' || token_text === '++') { // unary operators special case
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if (last_text === ';') {
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// space for (;; ++i)
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start_delim = true;
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end_delim = false;
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} else {
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start_delim = false;
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end_delim = false;
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}
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} else if (token_text === '!' && last_type === 'TK_START_EXPR') {
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// special case handling: if (!a)
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start_delim = false;
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end_delim = false;
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} else if (last_type === 'TK_OPERATOR') {
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start_delim = false;
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end_delim = false;
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} else if (last_type === 'TK_END_EXPR') {
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start_delim = true;
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end_delim = true;
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} else if (token_text === '.') {
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// decimal digits or object.property
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start_delim = false;
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end_delim = false;
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} else if (token_text === ':') {
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// zz: xx
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// can't differentiate ternary op, so for now it's a ? b: c; without space before colon
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if (last_text.match(/^\d+$/)) {
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// a little help for ternary a ? 1 : 0;
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start_delim = true;
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} else {
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start_delim = false;
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}
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}
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if (start_delim) {
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print_space();
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}
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print_token();
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if (end_delim) {
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print_space();
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}
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break;
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case 'TK_BLOCK_COMMENT':
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print_newline();
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print_token();
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print_newline();
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break;
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case 'TK_COMMENT':
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// print_newline();
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print_space();
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print_token();
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print_newline();
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break;
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case 'TK_UNKNOWN':
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print_token();
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break;
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}
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last_type = token_type;
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last_text = token_text;
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}
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return output.join('');
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}
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