410 lines
10 KiB
JavaScript
410 lines
10 KiB
JavaScript
import detectIndent from "detect-indent";
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import Whitespace from "./whitespace";
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import repeating from "repeating";
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import SourceMap from "./source-map";
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import Position from "./position";
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import * as messages from "../messages";
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import Buffer from "./buffer";
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import extend from "lodash/object/extend";
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import each from "lodash/collection/each";
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import n from "./node";
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import * as t from "../types";
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class CodeGenerator {
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constructor(ast, opts, code) {
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opts = opts || {};
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this.comments = ast.comments || [];
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this.tokens = ast.tokens || [];
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this.format = CodeGenerator.normalizeOptions(code, opts, this.tokens);
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this.opts = opts;
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this.ast = ast;
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this.whitespace = new Whitespace(this.tokens, this.comments, this.format);
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this.position = new Position;
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this.map = new SourceMap(this.position, opts, code);
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this.buffer = new Buffer(this.position, this.format);
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}
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static normalizeOptions(code, opts, tokens) {
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var style = " ";
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if (code) {
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var indent = detectIndent(code).indent;
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if (indent && indent !== " ") style = indent;
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}
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var format = {
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retainLines: opts.retainLines,
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comments: opts.comments == null || opts.comments,
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compact: opts.compact,
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quotes: CodeGenerator.findCommonStringDelimiter(code, tokens),
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indent: {
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adjustMultilineComment: true,
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style: style,
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base: 0
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}
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};
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if (format.compact === "auto") {
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format.compact = code.length > 100000; // 100KB
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if (format.compact) {
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console.error("[BABEL] " + messages.get("codeGeneratorDeopt", opts.filename, "100KB"));
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}
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}
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return format;
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}
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static findCommonStringDelimiter(code, tokens) {
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var occurences = {
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single: 0,
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double: 0
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};
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var checked = 0;
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for (var i = 0; i < tokens.length; i++) {
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var token = tokens[i];
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if (token.type.label !== "string") continue;
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if (checked >= 3) continue;
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var raw = code.slice(token.start, token.end);
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if (raw[0] === "'") {
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occurences.single++;
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} else {
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occurences.double++;
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}
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checked++;
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}
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if (occurences.single > occurences.double) {
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return "single";
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} else {
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return "double";
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}
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}
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static generators = {
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templateLiterals: require("./generators/template-literals"),
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comprehensions: require("./generators/comprehensions"),
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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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flow: require("./generators/flow"),
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base: require("./generators/base"),
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jsx: require("./generators/jsx")
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};
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generate() {
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var ast = this.ast;
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this.print(ast);
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var comments = [];
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each(ast.comments, function (comment) {
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if (!comment._displayed) comments.push(comment);
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});
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this._printComments(comments);
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return {
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map: this.map.get(),
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code: this.buffer.get()
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};
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}
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buildPrint(parent) {
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var print = (node, opts) => {
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return this.print(node, parent, opts);
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};
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print.sequence = (nodes, opts = {}) => {
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opts.statement = true;
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return this.printJoin(print, nodes, opts);
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};
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print.join = (nodes, opts) => {
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return this.printJoin(print, nodes, opts);
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};
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print.list = function (items, opts = {}) {
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if (opts.separator == null) opts.separator = ", ";
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print.join(items, opts);
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};
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print.block = (node) => {
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return this.printBlock(print, node);
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};
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print.indentOnComments = (node) => {
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return this.printAndIndentOnComments(print, node);
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};
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return print;
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}
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catchUp(node, parent) {
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// catch up to this nodes newline if we're behind
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if (node.loc && this.format.retainLines && this.buffer.buf) {
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var needsParens = false;
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if (parent && this.position.line < node.loc.start.line && t.isTerminatorless(parent)) {
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needsParens = true;
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this._push("(");
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}
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while (this.position.line < node.loc.start.line) {
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this._push("\n");
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}
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return needsParens;
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}
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return false;
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}
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print(node, parent, opts = {}) {
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if (!node) return;
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if (parent && parent._compact) {
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node._compact = true;
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}
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var oldConcise = this.format.concise;
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if (node._compact) {
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this.format.concise = true;
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}
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var newline = (leading) => {
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if (!opts.statement && !n.isUserWhitespacable(node, parent)) {
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return;
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}
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var lines = 0;
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if (node.start != null && !node._ignoreUserWhitespace) {
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// user node
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if (leading) {
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lines = this.whitespace.getNewlinesBefore(node);
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} else {
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lines = this.whitespace.getNewlinesAfter(node);
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}
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} else {
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// generated node
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if (!leading) lines++; // always include at least a single line after
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if (opts.addNewlines) lines += opts.addNewlines(leading, node) || 0;
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var needs = n.needsWhitespaceAfter;
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if (leading) needs = n.needsWhitespaceBefore;
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if (needs(node, parent)) lines++;
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// generated nodes can't add starting file whitespace
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if (!this.buffer.buf) lines = 0;
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}
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this.newline(lines);
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};
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if (this[node.type]) {
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var needsNoLineTermParens = n.needsParensNoLineTerminator(node, parent);
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var needsParens = needsNoLineTermParens || n.needsParens(node, parent);
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if (needsParens) this.push("(");
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if (needsNoLineTermParens) this.indent();
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this.printLeadingComments(node, parent);
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var needsParensFromCatchup = this.catchUp(node, parent);
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newline(true);
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if (opts.before) opts.before();
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this.map.mark(node, "start");
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this[node.type](node, this.buildPrint(node), parent);
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if (needsNoLineTermParens) {
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this.newline();
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this.dedent();
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}
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if (needsParens || needsParensFromCatchup) this.push(")");
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this.map.mark(node, "end");
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if (opts.after) opts.after();
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newline(false);
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this.printTrailingComments(node, parent);
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} else {
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throw new ReferenceError(`unknown node of type ${JSON.stringify(node.type)} with constructor ${JSON.stringify(node && node.constructor.name)}`);
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}
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this.format.concise = oldConcise;
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}
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printJoin(print, nodes, opts = {}) {
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if (!nodes || !nodes.length) return;
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var len = nodes.length;
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if (opts.indent) this.indent();
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each(nodes, (node, i) => {
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print(node, {
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statement: opts.statement,
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addNewlines: opts.addNewlines,
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after: () => {
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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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this.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) this.dedent();
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}
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printAndIndentOnComments(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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printBlock(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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generateComment(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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printTrailingComments(node, parent) {
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this._printComments(this.getComments("trailingComments", node, parent));
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}
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printLeadingComments(node, parent) {
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this._printComments(this.getComments("leadingComments", node, parent));
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}
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getComments(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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if (t.isExpressionStatement(node)) {
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nodes.push(node.argument);
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}
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each(nodes, (node) => {
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comments = comments.concat(this._getComments(key, node));
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});
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return comments;
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}
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_getComments(key, node) {
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return (node && node[key]) || [];
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}
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_printComments(comments) {
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if (this.format.compact) return;
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if (!this.format.comments) return;
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if (!comments || !comments.length) return;
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each(comments, (comment) => {
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var skip = false;
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// find the original comment in the ast and set it as displayed
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each(this.ast.comments, function (origComment) {
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if (origComment.start === comment.start) {
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// comment has already been output
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if (origComment._displayed) skip = true;
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origComment._displayed = true;
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return false;
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}
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});
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if (skip) return;
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this.catchUp(comment);
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// whitespace before
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this.newline(this.whitespace.getNewlinesBefore(comment));
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var column = this.position.column;
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var val = this.generateComment(comment);
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if (column && !this.isLast(["\n", " ", "[", "{"])) {
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this._push(" ");
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column++;
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}
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//
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if (comment.type === "Block" && this.format.indent.adjustMultilineComment) {
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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(this.indentSize(), column);
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val = val.replace(/\n/g, `\n${repeating(" ", indent)}`);
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}
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if (column === 0) {
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val = this.getIndent() + val;
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}
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// force a newline for line comments when retainLines is set in case the next printed node
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// doesn't catch up
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if (this.format.retainLines && comment.type === "Line") {
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val += "\n";
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}
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//
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this._push(val);
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// whitespace after
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this.newline(this.whitespace.getNewlinesAfter(comment));
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});
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}
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}
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each(Buffer.prototype, function (fn, key) {
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CodeGenerator.prototype[key] = function () {
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return fn.apply(this.buffer, arguments);
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};
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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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module.exports = function (ast, opts, code) {
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var gen = new CodeGenerator(ast, opts, code);
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return gen.generate();
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};
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module.exports.CodeGenerator = CodeGenerator;
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