455 lines
10 KiB
JavaScript
455 lines
10 KiB
JavaScript
module.exports = function (code, ast, opts) {
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var gen = new CodeGenerator(code, ast, opts);
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return gen.generate();
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};
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module.exports.CodeGenerator = CodeGenerator;
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var sourceMap = require("source-map");
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var util = require("./util");
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var t = require("./types");
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var _ = require("lodash");
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function CodeGenerator(code, ast, opts) {
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opts = opts || {};
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this.tabWidth = 2;
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this.comments = ast.comments || [];
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this.tokens = _.sortBy(_.compact([].concat(ast.tokens, this.comments)), "start");
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this.code = code;
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this.opts = opts;
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this.ast = ast;
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this.buf = "";
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this.usedLineWhitespace = [];
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this._indent = 0;
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this.column = 0;
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this.line = 1;
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if (opts.sourceMap) {
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this.map = new sourceMap.SourceMapGenerator({
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file: opts.sourceMapName
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});
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this.map.setSourceContent(opts.sourceFileName, code);
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} else {
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this.map = null;
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}
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}
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CodeGenerator.prototype.mark = function (node, type) {
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var loc = node.loc;
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if (!loc) return; // no location info
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var map = this.map;
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if (!map) return; // no source map
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map.addMapping({
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source: this.opts.sourceFileName,
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generated: {
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line: this.line,
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column: this.column
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},
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original: loc[type]
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});
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};
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CodeGenerator.prototype.newline = function (i, removeLast) {
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if (!this.buf) return;
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if (_.isBoolean(i)) {
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removeLast = i;
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i = null;
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}
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if (_.isNumber(i)) {
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var self = this;
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_.times(i, function () {
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self.newline(null, removeLast);
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});
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return;
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}
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if (removeLast && this.isLast("\n")) this.removeLast("\n");
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this.removeLast(" ");
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this.buf = this.buf.replace(/\n(\s+)$/, "\n");
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this._push("\n");
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};
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CodeGenerator.prototype.removeLast = function (cha) {
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if (!this.isLast(cha)) return;
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this.buf = this.buf.slice(0, -1);
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if (cha === "\n") {
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this.line--;
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} else {
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this.column--;
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}
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};
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CodeGenerator.prototype.semicolon = function () {
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this.push(";");
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};
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CodeGenerator.prototype.ensureSemicolon = function () {
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if (!this.isLast(";")) this.semicolon();
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};
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CodeGenerator.prototype.rightBrace = function () {
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this.newline(true);
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this.push("}");
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};
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CodeGenerator.prototype.keyword = function (name) {
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this.push(name);
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this.push(" ");
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};
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CodeGenerator.prototype.space = function () {
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if (this.buf && !this.isLast([" ", "\n"])) {
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this.push(" ");
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}
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};
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CodeGenerator.prototype.printAndIndentOnComments = function (print, node) {
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var indent = !!node.leadingComments;
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if (indent) this.indent();
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print(node);
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if (indent) this.dedent();
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};
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CodeGenerator.prototype.printBlock = function (print, node) {
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if (t.isEmptyStatement(node)) {
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this.semicolon();
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} else {
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this.push(" ");
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print(node);
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}
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};
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CodeGenerator.prototype.push = function (str, noIndent) {
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if (this._indent && !noIndent && str !== "\n") {
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// we have an indent level and we aren't pushing a newline
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var indent = this.getIndent();
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// replace all newlines with newlines with the indentation
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str = str.replace(/\n/g, "\n" + indent);
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// we've got a newline before us so prepend on the indentation
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if (this.isLast("\n")) str = indent + str;
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}
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this._push(str);
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};
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CodeGenerator.prototype._push = function (str) {
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var self = this;
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_.each(str, function (cha) {
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if (cha === "\n") {
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self.line++;
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self.column = 0;
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} else {
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self.column++;
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}
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});
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this.buf += str;
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};
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CodeGenerator.prototype.isLast = function (cha, trimRight) {
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var buf = this.buf;
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if (trimRight) buf = buf.trimRight();
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var chars = [].concat(cha);
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return _.contains(chars, _.last(buf));
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};
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CodeGenerator.prototype.getIndent = function () {
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return util.repeat(this.indentSize());
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};
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CodeGenerator.prototype.indentSize = function () {
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return this._indent * this.tabWidth;
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};
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CodeGenerator.prototype.indent = function () {
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this._indent++;
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};
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CodeGenerator.prototype.dedent = function () {
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this._indent--;
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};
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CodeGenerator.prototype.generate = function () {
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var ast = this.ast;
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this.print(ast);
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this.buf = this.buf.trimRight();
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this.buf = this.buf.replace(/\{\n\n/g, "{\n");
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var map = this.map;
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if (map) map = map.toJSON();
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return {
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map: map,
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ast: ast,
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code: this.buf
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};
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};
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CodeGenerator.prototype.buildPrint = function (parent) {
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var self = this;
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var print = function (node, opts) {
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return self.print(node, parent, opts);
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};
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print.sequence = function (nodes, opts) {
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opts = opts || {};
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opts.statement = true;
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return self.printJoin(print, nodes, opts);
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};
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return print;
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};
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CodeGenerator.prototype.needsNewlineBefore = function (node) {
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var startToken;
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var endToken;
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var tokens = this.tokens;
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_.each(tokens, function (token, i) {
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// this is the token this node starts with
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if (node.start === token.start) {
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startToken = tokens[i - 1];
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endToken = token;
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return false;
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}
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});
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return this.hasWhitespaceBetween(startToken, endToken);
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};
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CodeGenerator.prototype.needsNewlineAfter = function (node) {
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var startToken;
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var endToken;
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var tokens = this.tokens;
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_.each(tokens, function (token, i) {
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// this is the token this node ends with
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if (node.end === token.end) {
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startToken = token;
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endToken = tokens[i + 1];
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return false;
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}
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});
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return this.hasWhitespaceBetween(startToken, endToken);
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};
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CodeGenerator.prototype.hasWhitespaceBetween = function (startToken, endToken) {
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if (!endToken) return false;
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var start = startToken ? startToken.loc.end.line : 1;
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var end = endToken.loc.start.line;
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var sep = this.code.slice(start, end);
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var lines = 0;
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for (var line = start; line < end; line++) {
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if (!_.contains(this.usedLineWhitespace, line)) {
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this.usedLineWhitespace.push(line);
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lines++;
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}
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}
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return lines;
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};
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CodeGenerator.prototype.print = function (node, parent, opts) {
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if (!node) return "";
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var self = this;
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opts = opts || {};
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var newline = function (leading, fn) {
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var ignoreDuplicates = false;
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if (!opts.statement) {
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if (t.isUserWhitespacable(node)) {
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ignoreDuplicates = true;
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} else {
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return;
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}
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}
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var lines = 0;
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if (node.start != null) {
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// user node
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lines = fn.call(self, node);
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} else {
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// generated node
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if (!leading) lines++; // definently include a single line
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var needs = t.needsWhitespaceAfter;
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if (leading) needs = t.needsWhitespaceBefore;
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if (needs(node, opts.statement)) lines++;
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}
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self.newline(lines, ignoreDuplicates);
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};
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if (this[node.type]) {
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this.printLeadingComments(node, parent);
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newline(true, this.needsNewlineBefore);
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if (opts.before) opts.before();
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this.mark(node, "start");
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var needsParans = t.needsParans(node, parent);
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if (needsParans) this.push("(");
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this[node.type](node, this.buildPrint(node), parent);
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if (needsParans) this.push(")");
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this.mark(node, "end");
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if (opts.after) opts.after();
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newline(false, this.needsNewlineAfter);
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this.printTrailingComments(node, parent);
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} else {
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throw new ReferenceError("unknown node " + node.type + " " + JSON.stringify(node));
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}
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};
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CodeGenerator.prototype.generateComment = function (comment) {
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var val = comment.value;
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if (comment.type === "Line") {
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val = "//" + val;
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} else {
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val = "/*" + val + "*/";
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}
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return val;
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};
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CodeGenerator.prototype.printTrailingComments = function (node, parent) {
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this._printComments(this.getComments("trailingComments", node, parent));
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};
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CodeGenerator.prototype.printLeadingComments = function (node, parent) {
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this._printComments(this.getComments("leadingComments", node, parent));
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};
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CodeGenerator.prototype.getComments = function (key, node, parent) {
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if (t.isExpressionStatement(parent)) {
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return [];
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}
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var comments = [];
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var nodes = [node];
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var self = this;
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if (t.isExpressionStatement(node)) {
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nodes.push(node.argument);
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}
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_.each(nodes, function (node) {
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comments = comments.concat(self._getComments(key, node));
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});
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return comments;
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};
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CodeGenerator.prototype._getComments = function (key, node) {
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return (node && node[key]) || [];
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};
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CodeGenerator.prototype._printComments = function (comments) {
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if (!comments || !comments.length) return;
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var self = this;
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_.each(comments, function (comment, i) {
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// whitespace before
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self.newline(self.needsNewlineBefore(comment));
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var val = self.generateComment(comment);
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if (self.column && !self.isLast(["\n", " ", "[", "{"])) {
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self._push(" ");
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}
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//
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var offset = comment.loc.start.column;
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if (offset) {
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var newlineRegex = new RegExp("\\n\\s{1," + offset + "}", "g");
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val = val.replace(newlineRegex, "\n");
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}
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var indent = Math.max(self.indentSize(), self.column);
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val = val.replace(/\n/g, "\n" + util.repeat(indent));
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if (self.column == 0) {
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val = self.getIndent() + val;
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}
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//
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self._push(val);
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// whitespace after
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self.newline(self.needsNewlineAfter(comment));
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});
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};
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CodeGenerator.prototype.printJoin = function (print, nodes, opts) {
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opts = opts || {};
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var self = this;
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var len = nodes.length;
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if (opts.indent) self.indent();
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_.each(nodes, function (node, i) {
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print(node, {
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statement: opts.statement,
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after: function () {
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if (opts.iterator) {
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opts.iterator(node, i);
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}
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if (opts.separator && i < len - 1) {
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self.push(opts.separator);
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}
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}
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});
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});
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if (opts.indent) self.dedent();
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};
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CodeGenerator.generators = {
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arrayComprehensions: require("./generators/array-comprehensions"),
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templateLiterals: require("./generators/template-literals"),
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expressions: require("./generators/expressions"),
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statements: require("./generators/statements"),
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classes: require("./generators/classes"),
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methods: require("./generators/methods"),
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modules: require("./generators/modules"),
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types: require("./generators/types"),
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base: require("./generators/base"),
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jsx: require("./generators/jsx")
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};
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_.each(CodeGenerator.generators, function (generator) {
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_.extend(CodeGenerator.prototype, generator);
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});
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