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| module.exports = function (ast, opts, code) {
var gen = new CodeGenerator(ast, opts, code);
return gen.generate();
};
module.exports.CodeGenerator = CodeGenerator;
var Whitespace = require("./whitespace");
var SourceMap = require("./source-map");
var Position = require("./position");
var Buffer = require("./buffer");
var util = require("../util");
var n = require("./node");
var t = require("../types");
var _ = require("lodash");
function CodeGenerator(ast, opts, code) {
opts = opts || {};
this.comments = ast.comments || [];
this.tokens = ast.tokens || [];
this.format = CodeGenerator.normaliseOptions(opts);
this.ast = ast;
this.whitespace = new Whitespace(this.tokens, this.comments);
this.position = new Position;
this.map = new SourceMap(this.position, opts, code);
this.buffer = new Buffer(this.position, this.format);
}
_.each(Buffer.prototype, function (fn, key) {
CodeGenerator.prototype[key] = function () {
return fn.apply(this.buffer, arguments);
};
});
CodeGenerator.normaliseOptions = function (opts) {
return _.merge({
parentheses: true,
comments: opts.comments == null || opts.comments,
compact: false,
indent: {
adjustMultilineComment: true,
style: " ",
base: 0
}
}, opts.format || {});
};
CodeGenerator.generators = {
templateLiterals: require("./generators/template-literals"),
comprehensions: require("./generators/comprehensions"),
expressions: require("./generators/expressions"),
statements: require("./generators/statements"),
playground: require("./generators/playground"),
classes: require("./generators/classes"),
methods: require("./generators/methods"),
modules: require("./generators/modules"),
types: require("./generators/types"),
flow: require("./generators/flow"),
base: require("./generators/base"),
jsx: require("./generators/jsx")
};
_.each(CodeGenerator.generators, function (generator) {
_.extend(CodeGenerator.prototype, generator);
});
CodeGenerator.prototype.generate = function () {
var ast = this.ast;
this.print(ast);
var comments = [];
_.each(ast.comments, function (comment) {
if (!comment._displayed) comments.push(comment);
});
this._printComments(comments);
return {
map: this.map.get(),
code: this.buffer.get()
};
};
CodeGenerator.prototype.buildPrint = function (parent) {
var self = this;
var print = function (node, opts) {
return self.print(node, parent, opts);
};
print.sequence = function (nodes, opts) {
opts = opts || {};
opts.statement = true;
return self.printJoin(print, nodes, opts);
};
print.join = function (nodes, opts) {
return self.printJoin(print, nodes, opts);
};
print.block = function (node) {
return self.printBlock(print, node);
};
print.indentOnComments = function (node) {
return self.printAndIndentOnComments(print, node);
};
return print;
};
CodeGenerator.prototype.print = function (node, parent, opts) {
if (!node) return "";
var self = this;
opts = opts || {};
var newline = function (leading) {
if (!opts.statement && !n.isUserWhitespacable(node, parent)) {
return;
}
var lines = 0;
if (node.start != null) {
// user node
if (leading) {
lines = self.whitespace.getNewlinesBefore(node);
} else {
lines = self.whitespace.getNewlinesAfter(node);
}
} else {
// generated node
if (!leading) lines++; // always include at least a single line after
var needs = n.needsWhitespaceAfter;
if (leading) needs = n.needsWhitespaceBefore;
lines += needs(node, parent);
// generated nodes can't add starting file whitespace
if (!self.buffer.get()) lines = 0;
}
self.newline(lines);
};
Eif (this[node.type]) {
this.printLeadingComments(node, parent);
newline(true);
Iif (opts.before) opts.before();
this.map.mark(node, "start");
// only compute if this node needs parens if our parent has been changed
// since acorn would've wrapped us in a ParanthesizedExpression
var needsParens = n.needsParens(node, parent);
if (needsParens) this.push("(");
this[node.type](node, this.buildPrint(node), parent);
if (needsParens) this.push(")");
this.map.mark(node, "end");
if (opts.after) opts.after();
newline(false);
this.printTrailingComments(node, parent);
} else {
throw new ReferenceError("unknown node " + node.type);
}
};
CodeGenerator.prototype.printJoin = function (print, nodes, opts) {
if (!nodes || !nodes.length) return;
opts = opts || {};
var self = this;
var len = nodes.length;
if (opts.indent) self.indent();
_.each(nodes, function (node, i) {
print(node, {
statement: opts.statement,
after: function () {
if (opts.iterator) {
opts.iterator(node, i);
}
if (opts.separator && i < len - 1) {
self.push(opts.separator);
}
}
});
});
if (opts.indent) self.dedent();
};
CodeGenerator.prototype.printAndIndentOnComments = function (print, node) {
var indent = !!node.leadingComments;
if (indent) this.indent();
print(node);
if (indent) this.dedent();
};
CodeGenerator.prototype.printBlock = function (print, node) {
if (t.isEmptyStatement(node)) {
this.semicolon();
} else {
this.push(" ");
print(node);
}
};
CodeGenerator.prototype.generateComment = function (comment) {
var val = comment.value;
if (comment.type === "Line") {
val = "//" + val;
} else {
val = "/*" + val + "*/";
}
return val;
};
CodeGenerator.prototype.printTrailingComments = function (node, parent) {
this._printComments(this.getComments("trailingComments", node, parent));
};
CodeGenerator.prototype.printLeadingComments = function (node, parent) {
this._printComments(this.getComments("leadingComments", node, parent));
};
CodeGenerator.prototype.getComments = function (key, node, parent) {
if (t.isExpressionStatement(parent)) {
return [];
}
var comments = [];
var nodes = [node];
var self = this;
if (t.isExpressionStatement(node)) {
nodes.push(node.argument);
}
_.each(nodes, function (node) {
comments = comments.concat(self._getComments(key, node));
});
return comments;
};
CodeGenerator.prototype._getComments = function (key, node) {
return (node && node[key]) || [];
};
CodeGenerator.prototype._printComments = function (comments) {
Iif (this.format.compact) return;
Iif (!this.format.comments) return;
if (!comments || !comments.length) return;
var self = this;
_.each(comments, function (comment) {
// find the original comment in the ast and set it as displayed
_.each(self.ast.comments, function (origComment) {
if (origComment.start === comment.start) {
origComment._displayed = true;
return false;
}
});
// whitespace before
self.newline(self.whitespace.getNewlinesBefore(comment));
var column = self.position.column;
var val = self.generateComment(comment);
if (column && !self.isLast(["\n", " ", "[", "{"])) {
self._push(" ");
column++;
}
//
if (comment.type === "Block" && self.format.indent.adjustMultilineComment) {
var offset = comment.loc.start.column;
if (offset) {
var newlineRegex = new RegExp("\\n\\s{1," + offset + "}", "g");
val = val.replace(newlineRegex, "\n");
}
var indent = Math.max(self.indentSize(), column);
val = val.replace(/\n/g, "\n" + util.repeat(indent));
}
if (column === 0) {
val = self.getIndent() + val;
}
//
self._push(val);
// whitespace after
self.newline(self.whitespace.getNewlinesAfter(comment));
});
};
|