1 |
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2 |
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4 |
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5 | "use strict";
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6 |
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7 | const Stats = require("./Stats");
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8 |
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9 | class Watching {
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10 | constructor(compiler, watchOptions, handler) {
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11 | this.startTime = null;
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12 | this.invalid = false;
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13 | this.handler = handler;
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14 | this.callbacks = [];
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15 | this.closed = false;
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16 | if (typeof watchOptions === "number") {
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17 | this.watchOptions = {
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18 | aggregateTimeout: watchOptions
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19 | };
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20 | } else if (watchOptions && typeof watchOptions === "object") {
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21 | this.watchOptions = Object.assign({}, watchOptions);
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22 | } else {
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23 | this.watchOptions = {};
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24 | }
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25 | this.watchOptions.aggregateTimeout =
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26 | this.watchOptions.aggregateTimeout || 200;
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27 | this.compiler = compiler;
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28 | this.running = true;
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29 | this.compiler.readRecords(err => {
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30 | if (err) return this._done(err);
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31 |
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32 | this._go();
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33 | });
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34 | }
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35 |
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36 | _go() {
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37 | this.startTime = Date.now();
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38 | this.running = true;
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39 | this.invalid = false;
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40 | this.compiler.hooks.watchRun.callAsync(this.compiler, err => {
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41 | if (err) return this._done(err);
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42 | const onCompiled = (err, compilation) => {
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43 | if (err) return this._done(err);
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44 | if (this.invalid) return this._done();
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45 |
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46 | if (this.compiler.hooks.shouldEmit.call(compilation) === false) {
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47 | return this._done(null, compilation);
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48 | }
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49 |
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50 | this.compiler.emitAssets(compilation, err => {
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51 | if (err) return this._done(err);
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52 | if (this.invalid) return this._done();
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53 | this.compiler.emitRecords(err => {
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54 | if (err) return this._done(err);
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55 |
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56 | if (compilation.hooks.needAdditionalPass.call()) {
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57 | compilation.needAdditionalPass = true;
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58 |
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59 | const stats = new Stats(compilation);
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60 | stats.startTime = this.startTime;
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61 | stats.endTime = Date.now();
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62 | this.compiler.hooks.done.callAsync(stats, err => {
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63 | if (err) return this._done(err);
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64 |
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65 | this.compiler.hooks.additionalPass.callAsync(err => {
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66 | if (err) return this._done(err);
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67 | this.compiler.compile(onCompiled);
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68 | });
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69 | });
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70 | return;
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71 | }
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72 | return this._done(null, compilation);
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73 | });
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74 | });
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75 | };
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76 | this.compiler.compile(onCompiled);
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77 | });
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78 | }
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79 |
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80 | _getStats(compilation) {
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81 | const stats = new Stats(compilation);
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82 | stats.startTime = this.startTime;
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83 | stats.endTime = Date.now();
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84 | return stats;
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85 | }
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86 |
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87 | _done(err, compilation) {
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88 | this.running = false;
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89 | if (this.invalid) return this._go();
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90 |
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91 | const stats = compilation ? this._getStats(compilation) : null;
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92 | if (err) {
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93 | this.compiler.hooks.failed.call(err);
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94 | this.handler(err, stats);
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95 | return;
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96 | }
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97 | this.compiler.hooks.done.callAsync(stats, () => {
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98 | this.handler(null, stats);
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99 | if (!this.closed) {
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100 | this.watch(
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101 | Array.from(compilation.fileDependencies),
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102 | Array.from(compilation.contextDependencies),
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103 | Array.from(compilation.missingDependencies)
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104 | );
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105 | }
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106 | for (const cb of this.callbacks) cb();
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107 | this.callbacks.length = 0;
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108 | });
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109 | }
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110 |
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111 | watch(files, dirs, missing) {
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112 | this.pausedWatcher = null;
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113 | this.watcher = this.compiler.watchFileSystem.watch(
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114 | files,
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115 | dirs,
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116 | missing,
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117 | this.startTime,
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118 | this.watchOptions,
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119 | (
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120 | err,
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121 | filesModified,
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122 | contextModified,
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123 | missingModified,
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124 | fileTimestamps,
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125 | contextTimestamps,
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126 | removedFiles
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127 | ) => {
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128 | this.pausedWatcher = this.watcher;
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129 | this.watcher = null;
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130 | if (err) {
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131 | return this.handler(err);
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132 | }
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133 | this.compiler.fileTimestamps = fileTimestamps;
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134 | this.compiler.contextTimestamps = contextTimestamps;
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135 | this.compiler.removedFiles = removedFiles;
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136 | this._invalidate();
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137 | },
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138 | (fileName, changeTime) => {
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139 | this.compiler.hooks.invalid.call(fileName, changeTime);
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140 | }
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141 | );
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142 | }
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143 |
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144 | invalidate(callback) {
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145 | if (callback) {
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146 | this.callbacks.push(callback);
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147 | }
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148 | if (this.watcher) {
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149 | this.compiler.fileTimestamps = this.watcher.getFileTimestamps();
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150 | this.compiler.contextTimestamps = this.watcher.getContextTimestamps();
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151 | }
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152 | return this._invalidate();
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153 | }
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154 |
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155 | _invalidate() {
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156 | if (this.watcher) {
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157 | this.pausedWatcher = this.watcher;
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158 | this.watcher.pause();
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159 | this.watcher = null;
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160 | }
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161 | if (this.running) {
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162 | this.invalid = true;
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163 | return false;
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164 | } else {
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165 | this._go();
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166 | }
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167 | }
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168 |
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169 | close(callback) {
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170 | const finalCallback = () => {
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171 | this.compiler.hooks.watchClose.call();
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172 | this.compiler.running = false;
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173 | this.compiler.watchMode = false;
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174 | if (callback !== undefined) callback();
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175 | };
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176 |
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177 | this.closed = true;
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178 | if (this.watcher) {
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179 | this.watcher.close();
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180 | this.watcher = null;
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181 | }
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182 | if (this.pausedWatcher) {
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183 | this.pausedWatcher.close();
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184 | this.pausedWatcher = null;
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185 | }
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186 | if (this.running) {
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187 | this.invalid = true;
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188 | this._done = finalCallback;
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189 | } else {
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190 | finalCallback();
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191 | }
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192 | }
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193 | }
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194 |
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195 | module.exports = Watching;
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