Fix #4558: Stack trace line numbers for scripts that compile CoffeeSc…

…ript (#4645)

* Don't throw an error in the console when loading a try: URL

* Handle the possibility of compiling multiple scripts with the same filename, or multiple anonymous scripts

* Fix #4558: Much more robust caching of sources and source maps, more careful lookup of source maps especially for CoffeeScript code compiled within a Coffee script (. . . within a Coffee script, etc.)

* Reimplement `cake release` to just use the shell to avoid the issues plaguing that command (something to do with module caching perhaps)

Cakefile

@@ -341,11 +341,15 @@ task 'doc:source:watch', 'watch and continually rebuild the annotated source doc
 
 
 task 'release', 'build and test the CoffeeScript source, and build the documentation', ->
-  invoke 'build:full'
-  invoke 'build:browser:full'
-  invoke 'doc:site'
-  invoke 'doc:test'
-  invoke 'doc:source'
+  execSync '''
+    cake build:full
+    cake build:browser
+    cake test:browser
+    cake test:integrations
+    cake doc:site
+    cake doc:test
+    cake doc:source''', stdio: 'inherit'
+
 
 task 'bench', 'quick benchmark of compilation time', ->
   {Rewriter} = require './lib/coffeescript/rewriter'

docs/v2/index.html

@@ -4682,7 +4682,7 @@ <h2 class="header">
     else
       initializeScrollspyFromHash window.location.hash
       # Initializing the code editors might’ve thrown off our vertical scroll position
-      document.getElementById(window.location.hash.slice(1)).scrollIntoView()
+      document.getElementById(window.location.hash.slice(1).replace(/try:.*/, '')).scrollIntoView()
 
 </script>
 

documentation/v2/docs.coffee

@@ -125,4 +125,4 @@ $(document).ready ->
     else
       initializeScrollspyFromHash window.location.hash
       # Initializing the code editors might’ve thrown off our vertical scroll position
-      document.getElementById(window.location.hash.slice(1)).scrollIntoView()
+      document.getElementById(window.location.hash.slice(1).replace(/try:.*/, '')).scrollIntoView()

src/coffeescript.coffee

@@ -14,7 +14,7 @@ packageJson   = require '../../package.json'
 # The current CoffeeScript version number.
 exports.VERSION = packageJson.version
 
-exports.FILE_EXTENSIONS = ['.coffee', '.litcoffee', '.coffee.md']
+exports.FILE_EXTENSIONS = FILE_EXTENSIONS = ['.coffee', '.litcoffee', '.coffee.md']
 
 # Expose helpers for testing.
 exports.helpers = helpers
@@ -49,9 +49,9 @@ withPrettyErrors = (fn) ->
 # a stack trace. Assuming that most of the time, code isn’t throwing
 # exceptions, it’s probably more efficient to compile twice only when we
 # need a stack trace, rather than always generating a source map even when
-# it’s not likely to be used. Save in form of `filename`: `(source)`
+# it’s not likely to be used. Save in form of `filename`: [`(source)`]
 sources = {}
-# Also save source maps if generated, in form of `filename`: `(source map)`.
+# Also save source maps if generated, in form of `(source)`: [`(source map)`].
 sourceMaps = {}
 
 # Compile CoffeeScript code to JavaScript, using the Coffee/Jison compiler.
@@ -75,7 +75,8 @@ exports.compile = compile = withPrettyErrors (code, options) ->
 
   checkShebangLine filename, code
 
-  sources[filename] = code
+  sources[filename] ?= []
+  sources[filename].push code
   map = new SourceMap if generateSourceMap
 
   tokens = lexer.tokenize code, options
@@ -124,8 +125,9 @@ exports.compile = compile = withPrettyErrors (code, options) ->
     js = "// #{header}\n#{js}"
 
   if generateSourceMap
-    v3SourceMap = map.generate(options, code)
-    sourceMaps[filename] = map
+    v3SourceMap = map.generate options, code
+    sourceMaps[filename] ?= []
+    sourceMaps[filename].push map
 
   if options.inlineMap
     encoded = base64encode JSON.stringify v3SourceMap
@@ -264,16 +266,36 @@ formatSourcePosition = (frame, getSourceMapping) ->
   else
     fileLocation
 
-getSourceMap = (filename) ->
-  if sourceMaps[filename]?
-    sourceMaps[filename]
-  # CoffeeScript compiled in a browser may get compiled with `options.filename`
-  # of `<anonymous>`, but the browser may request the stack trace with the
-  # filename of the script file.
+getSourceMap = (filename, line, column) ->
+  # Skip files that we didn’t compile, like Node system files that appear in
+  # the stack trace, as they never have source maps.
+  return null unless filename is '<anonymous>' or filename.slice(filename.lastIndexOf('.')) in FILE_EXTENSIONS
+
+  if filename isnt '<anonymous>' and sourceMaps[filename]?
+    return sourceMaps[filename][sourceMaps[filename].length - 1]
+  # CoffeeScript compiled in a browser or via `CoffeeScript.compile` or `.run`
+  # may get compiled with `options.filename` that’s missing, which becomes
+  # `<anonymous>`; but the runtime might request the stack trace with the
+  # filename of the script file. See if we have a source map cached under
+  # `<anonymous>` that matches the error.
   else if sourceMaps['<anonymous>']?
-    sourceMaps['<anonymous>']
-  else if sources[filename]?
-    answer = compile sources[filename],
+    # Work backwards from the most recent anonymous source maps, until we find
+    # one that works. This isn’t foolproof; there is a chance that multiple
+    # source maps will have line/column pairs that match. But we have no other
+    # way to match them. `frame.getFunction().toString()` doesn’t always work,
+    # and it’s not foolproof either.
+    for map in sourceMaps['<anonymous>'] by -1
+      sourceLocation = map.sourceLocation [line - 1, column - 1]
+      return map if sourceLocation?[0]? and sourceLocation[1]?
+
+  # If all else fails, recompile this source to get a source map. We need the
+  # previous section (for `<anonymous>`) despite this option, because after it
+  # gets compiled we will still need to look it up from
+  # `sourceMaps['<anonymous>']` in order to find and return it. That’s why we
+  # start searching from the end in the previous block, because most of the
+  # time the source map we want is the last one.
+  if sources[filename]?
+    answer = compile sources[filename][sources[filename].length - 1],
       filename: filename
       sourceMap: yes
       literate: helpers.isLiterate filename
@@ -287,7 +309,7 @@ getSourceMap = (filename) ->
 # positions.
 Error.prepareStackTrace = (err, stack) ->
   getSourceMapping = (filename, line, column) ->
-    sourceMap = getSourceMap filename
+    sourceMap = getSourceMap filename, line, column
     answer = sourceMap.sourceLocation [line - 1, column - 1] if sourceMap?
     if answer? then [answer[0] + 1, answer[1] + 1] else null
 

test/error_messages.coffee

@@ -75,7 +75,7 @@ if require?
     finally
       fs.unlinkSync tempFile
 
-  test "#3890 Error.prepareStackTrace doesn't throw an error if a compiled file is deleted", ->
+  test "#3890: Error.prepareStackTrace doesn't throw an error if a compiled file is deleted", ->
     # Adapted from https://github.com/atom/coffee-cash/blob/master/spec/coffee-cash-spec.coffee
     filePath = path.join os.tmpdir(), 'PrepareStackTraceTestFile.coffee'
     fs.writeFileSync filePath, "module.exports = -> throw new Error('hello world')"
@@ -90,7 +90,7 @@ if require?
     doesNotThrow(-> error.stack)
     notEqual error.stack.toString().indexOf(filePath), -1
 
-  test "#4418 stack traces for compiled files reference the correct line number", ->
+  test "#4418: stack traces for compiled files reference the correct line number", ->
     filePath = path.join os.tmpdir(), 'StackTraceLineNumberTestFile.coffee'
     fileContents = """
       testCompiledFileStackTraceLineNumber = ->
@@ -111,22 +111,39 @@ if require?
     eq /StackTraceLineNumberTestFile.coffee:(\d)/.exec(error.stack.toString())[1], '3'
 
 
-test "#4418 stack traces for compiled strings reference the correct line number", ->
+test "#4418: stack traces for compiled strings reference the correct line number", ->
   try
-    CoffeeScript.run """
+    CoffeeScript.run '''
       testCompiledStringStackTraceLineNumber = ->
         # `a` on the next line is undefined and should throw a ReferenceError
         console.log a if true
 
       do testCompiledStringStackTraceLineNumber
-      """
+      '''
   catch error
 
   # Make sure the line number reported is line 3 (the original Coffee source)
   # and not line 6 (the generated JavaScript).
   eq /testCompiledStringStackTraceLineNumber.*:(\d):/.exec(error.stack.toString())[1], '3'
 
 
+test "#4558: compiling a string inside a script doesn’t screw up stack trace line number", ->
+  try
+    CoffeeScript.run '''
+      testCompilingInsideAScriptDoesntScrewUpStackTraceLineNumber = ->
+        if require?
+          CoffeeScript = require './lib/coffeescript'
+          CoffeeScript.compile ''
+        throw new Error 'Some Error'
+
+      do testCompilingInsideAScriptDoesntScrewUpStackTraceLineNumber
+      '''
+  catch error
+
+  # Make sure the line number reported is line 5 (the original Coffee source)
+  # and not line 10 (the generated JavaScript).
+  eq /testCompilingInsideAScriptDoesntScrewUpStackTraceLineNumber.*:(\d):/.exec(error.stack.toString())[1], '5'
+
 test "#1096: unexpected generated tokens", ->
   # Implicit ends
   assertErrorFormat 'a:, b', '''