88 lines
2.4 KiB
JavaScript
88 lines
2.4 KiB
JavaScript
/*
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* Copyright 2016 The Closure Compiler Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Logger for Closure Compiler output.
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*/
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'use strict';
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const ESC = '\u001B';
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const COLOR_END = ESC + '[0m';
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const COLOR_RED = ESC + '[91m';
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const COLOR_GREEN = ESC + '[92m';
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const COLOR_YELLOW = ESC + '[93m';
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/**
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* @param {string} line to generate prefix for
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* @param {number} charNo to generate prefix at
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* @return {string} prefix for showing a caret
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*/
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function caretPrefix(line, charNo) {
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return line.substr(0, charNo).replace(/[^\t]/g, ' ');
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}
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/**
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* @param {!Object} options
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* @param {!Object} output
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* @param {function(string)} logger
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* @return {boolean} Whether this output should fail a compilation.
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*/
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module.exports = function(options, output, logger) {
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logger = logger || console.warn;
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// TODO(samthor): If this file has a sourceMap, then follow it back out of the rabbit hole.
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function fileFor(file) {
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if (!file) { return null; }
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// Filenames are the same across source and externs, so prefer source files.
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for (const files of [options.jsCode, options.externs]) {
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if (!files) { continue; }
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for (const cand of files) {
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if (cand.path == file) {
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return cand;
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}
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}
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}
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return null;
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}
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function writemsg(color, msg) {
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if (!msg.file && msg.lineNo < 0) {
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logger(msg.type);
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} else {
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logger(`${msg.file}:${msg.lineNo} (${msg.type})`)
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}
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logger(msg.description);
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const file = fileFor(msg.file);
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if (file) {
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const lines = file.src.split('\n'); // TODO(samthor): cache this for logger?
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const line = lines[msg.lineNo - 1] || '';
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logger(color + line + COLOR_END);
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logger(COLOR_GREEN + caretPrefix(line, msg.charNo) + '^' + COLOR_END);
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}
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logger('');
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}
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output.warnings.forEach(writemsg.bind(null, COLOR_YELLOW));
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output.errors.forEach(writemsg.bind(null, COLOR_RED));
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return output.errors.length > 0;
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};
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