Why doesn't this problemMatcher in VS code work? - regex

Why doesnt my problemMatcher work? I'm pretty sure about the regex, but it doesn't report any problems, even there are some on stdout...
// the matcher
"problemMatcher": {
"owner": "typescript",
"fileLocation": ["relative", "${workspaceRoot}"],
"pattern": {
"regexp": "^TypeScript (warning|error): (.*)\\((\\d+),(\\d+)\\): (.*)$",
"severity": 1,
"file": 2,
"line": 3,
"column": 4,
"message": 5
}
}
//the browserify/tsify pipeline
browserify().add('main.ts')
.plugin(tsify, { noImplicitAny: false, removeComments:true })
.transform("babelify",{ extensions: ['.ts'], presets: ["es2015"]})
.bundle()
.on('error', function (error) { console.log(error.toString()); })
.pipe(source('bundle.js'))
.pipe(gulp.dest('www/js/dist/'));
//gulp sample output
[00:39:00] Starting 'ts-compile'...
TypeScript error: main.ts(118,30): Error TS2339: Property 'object' does not exist on type 'boolean'.
TypeScript error: main.ts(137,24): Error TS2339: Property 'object' does not exist on type 'boolean'.
TypeScript error: main.ts(507,44): Error TS2304: Cannot find name 'loading'.
[00:39:03] Finished 'ts-compile' after 2.98 s


I resolved the problem by putting tasks.json into .vscode folder. I initially thought tasks.json would be found like tsconfig.json (project-root), but it turned out to be wrong.

Related

VSCode Extension: problem matching on compiler output with blank line

Im currently writing a vscode extension for a language used with Campbell Scientific dataloggers. Part of the extension I have made specifies a custom problem matcher for the compiler results.
The issue I am having is when I send the crbasic program (test.cr300) to the compiler using a task in tasks.json, I am unable to match the file name from the top of the compiler results.
Edit: This is due to the blank line in between the filename and the error messages. I currently am unable to find a way around this. Adding \n to the pattern doesn't work as expected even though it works on https://regex101.com/.
Example of returned text from the compiler:
test.cr300 -- Compile Failed!
line 12: Undeclared variable U1.
line 18: gmx600 not yet declared so cannot be aliased.
line 19: gmx600 not yet declared so cannot be aliased.
line 20: gmx600 not yet declared so cannot be aliased.
line 21: gmx600 not yet declared so cannot be aliased.
Pattern as specified in my package.json:
"pattern": [
{
"regexp": "^(.*\\.cr300).*\\n$",
"file": 1
},
{
"regexp": "^line\\s(\\d+):\\s(.+)$",
"line": 1,
"message": 2,
"loop": true
}
]
and here is my task from tasks.json when running the extension in debug.
{
"label": "CRBasic: Compiler",
"type": "shell",
"group": {
"kind": "build",
"isDefault": true
},
"options": {
"shell": {
"executable": "powershell.exe"
}
},
"command": "${config:CRBasic.Path.Compiler path}\\cr300comp.exe",
"args": [
"${file}"
],
"problemMatcher": [
"$crbasicCompiler"
]
}

You need to change the order of the regexes and add a loop attribute and change the group number for line and message
"pattern": [
{
"regexp": "^(.*\\.cr300) -- Compile Failed.*$",
"file": 1
},
{ "regexp": "^\\s*$" },
{
"regexp": "^line\\s(\\d+):\\s(.+)$",
"line": 1,
"message": 2,
"loop": true
}
]

After narrowing down the issue to a blank line, the below pattern now problem matches the compile output. In hindsight it seems obvious. Thanks to #rioV8 for the help.
"pattern": [
{
"regexp": "^(.*\\.cr300) -- Compile Failed.*$",
"file": 1
},
{
"regexp": "^.*$"
},
{
"regexp": "^line\\s(\\d+):\\s(.+)$",
"line": 1,
"message": 2,
"loop": true
}
]

How can I make a target 'makefile' in visual studio code?

I'm trying to figure out how to compile my c++ code within the vs code environment.
I'm able to compile using g++ but I haven't been able to figure it out in vs code yet.
I used the answer from BeeOnRope from this question to set up my build command and the associated hotkey.
How do I set up Visual Studio Code to compile C++ code?
The error that comes out is this
make: *** No rule to make target `Makefile'. Stop.
The terminal process terminated with exit code: 2
Edit: After working on my tasks.json it looks like this, however I'm still getting the same error shown above.
{
"version": "2.0.0",
"command": "make",
"tasks":[
{
"label": "Makefile",
"group": "build",
// Show the output window only if unrecognized errors occur.
"presentation": {"reveal": "always"},
// Pass 'all' as the build target
"args": ["all"],
// Use the standard less compilation problem matcher.
"problemMatcher": {
"owner": "cpp",
"fileLocation": ["relative", "${workspaceRoot}"],
"pattern": {
"regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
"file": 1,
"line": 2,
"column": 3,
"severity": 4,
"message": 5
}
}
}
]
}

In your tasks.json, add/edit the "command" and "args" fields to have the build command line you would run manually. That could be g++, make, or whatever. See here:
https://code.visualstudio.com/docs/editor/tasks
Update:
Looking at the tasks.json file that you posted, your command needs to go inside a task. Something like this:
{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"label": "My Build",
"group": "build",
"type": "shell",
"command": "g++",
"args": [
"-o", "LexParse", "Lexxy.cpp", "Parzival.cpp"
]
}
]
}
PS, One way to format your code here is to indent it all:
int main
{
[]( auto world ) { return "Hello"s + world; } ( ", World!" );
}
Another way is to wrap it in three backticks (no need to indent, though I do here so I can have backticks within backticks):
```
int main
{
[]( auto world ) { return "Hello"s + world; } ( ", World!" );
}
```

Visual Studio Code task regex not capturing build error output

I am having some problems with my Regex for parsing build output from rustc.
The output looks like
Compiling svd2rust v0.2.1 (file:///C:/trust/svd2rust)
error: expected one of `=>`, `#`, `if`, or `|`, found `Some`
--> src\main.rs:56:9
|
56 | Some("all") =>
| ^^^^
error: aborting due to previous error
error: Could not compile `svd2rust`.
To learn more, run the command again with --verbose.
My task at the moment looks like:
{
"version": "0.1.0",
"command": "cargo",
"isShellCommand": true,
"args": ["build"],
"problemMatcher": {
"owner": "build",
"fileLocation": ["relative", "${workspaceRoot}"],
"pattern": {
"regexp": "(error):(.*)\\s+-->\\s+(.*):(\\d+):(\\d+)",
"file": 3,
"line": 4,
"column": 5,
"severity": 1,
"message": 2
}
}
}
According to regex101, it looks like the regex should match the appropriate sections.

According to the VS Code documentation, you need a multiline problem matcher. This might work; I did not test it:
{
"version": "0.1.0",
"command": "cargo",
"isShellCommand": true,
"args": ["build"],
"problemMatcher": {
"owner": "build",
"fileLocation": ["relative", "${workspaceRoot}"],
"pattern": [{
"regexp": "(error):(.*)",
"severity": 1,
"message": 2
},{
"regexp": "-->\\s+([^:]*):(\\d+):(\\d+)",
"file": 1,
"line": 2,
"column": 3
}]
}
}

Correct regexp for Rust v1.20.0:
"pattern": [{
"regexp": "(error(?:\\[E\\d{4}\\])?|warning):\\s(.*)",
"severity": 1,
"message": 2
},{
"regexp": "-->\\s+([^:]*):(\\d+):(\\d+)",
"file": 1,
"line": 2,
"column": 3
}]

generate a cpp exe using json in vscode

I use this json file to generate a cpp exe in vs code, but it is unpleasant...After compiling a source file named 001.cpp, it generated a cpp exe named 001.cpp.exe. What should I do to generate a cpp exe named 001.exe?
Here is the JSON:
{
"version": "0.1.0",
"command": "g++",
"args": ["-g","${file}","-o","${file}.exe"],
"problemMatcher": {
"owner": "cpp",
"fileLocation": ["relative", "${workspaceRoot}"],
"pattern": {
"regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
"file": 1,
"line": 2,
"column": 3,
"severity": 4,
"message": 5
}
}
}

JSON formatting error using Boost JSON parser

I'm attempting to use Boost to read a JSON file from my Firefox configuration folder called sessionstore.js, where the information on the current/last Firefox session is saved for purposes of recovery. I've written a program based on the XML-based tutorial from the Boost website, simply swapping out the XML parts for the JSON parts, which can be seen below
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
#include <string>
#include <set>
#include <exception>
using boost::property_tree::ptree;
using namespace std;
const string FILENAME = "sessionstore.js";
const string WINDOW_TAG = "windows";
struct session_settings
{
void load (const string &FILENAME);
};
void session_settings::load (const string &FILENAME)
{
ptree pt;
read_json (FILENAME, pt);
}
int main()
{
try
{
session_settings Settings;
Settings.load(FILENAME);
}
catch (exception &e)
{
cout << "Error: " << e.what() << endl;
}
return 0;
}
The contents of the JSON file I'm trying to read are
{"windows":[{"tabs":[{"entries":[{"url":"about:home","title":"Mozilla Firefox Start Page","ID":5,"docshellID":11,"owner_b64":"NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAS8nfAAOr03buTZBMmukiq4HoizADOUR05MxABBLoP1AAAAAAAVhYm91dAAAAARob21l4NodcC97EdOM0ABgsPwUoweiLMAM5RHTkzEAEEug/UAAAAAADm1vei1zYWZlLWFib3V0AAAABGhvbWUAAAA=","docIdentifier":5},{"url":"http://www.google.co.uk/","title":"Google","ID":6,"docshellID":11,"docIdentifier":6,"children":[{"url":"about:blank","ID":7,"docshellID":12,"owner_b64":"NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAd6UctCANBHTk5kAEEug/UAHoizADOUR05MxABBLoP1AAAAAAv////8AAABQAQAAABhodHRwOi8vd3d3Lmdvb2dsZS5jby51ay8AAAAAAAAABAAAAAcAAAAQAAAAB/////8AAAAH/////wAAAAcAAAAQAAAAFwAAAAEAAAAXAAAAAQAAABcAAAABAAAAGAAAAAAAAAAY/////wAAABf/////AAAAF/////8AAAAX/////wEAAAAAAAAAAAABAAA=","docIdentifier":7,"scroll":"0,0"}],"formdata":{"#csi":"1","#hcache":"{\"BInSTfL-EtSt8QOl24nrCg\":[[69,{}],[14,{}],[60,{}],[81,{\"persisted\":true}],[42,{}],[43,{}],[83,{}],[95,{\"kfe\":{\"kfeHost\":\"clients1.google.co.uk\",\"kfeUrlPrefix\":\"/webpagethumbnail?r=2&f=2&s=300:585&query=&hl=en&gl=uk\",\"maxPrefetchConnections\":2,\"prefetch\":90,\"slowConnection\":false},\"logging\":{\"csiFraction\":0.05,\"gen204Fraction\":0.05},\"msgs\":{\"loading\":\"Still loading...\",\"mute\":\"Mute\",\"noPreview\":\"Preview not available\",\"sound\":\"Sound:\",\"soundOff\":\"off\",\"soundOn\":\"on\",\"unmute\":\"Unmute\"},\"pb\":{\"desiredHeight\":585,\"desiredWidth\":300,\"minHeight\":200,\"minWidth\":300},\"time\":{\"hoverClose\":300,\"hoverModeTimeout\":60,\"hoverOpen\":125,\"loading\":100,\"longHoverOpen\":725,\"prefetchOnLoad\":3000,\"timeout\":2500}}],[78,{}],[25,{\"m\":{\"bks\":true,\"blg\":true,\"dsc\":true,\"evn\":true,\"frm\":true,\"isch\":true,\"klg\":true,\"mbl\":true,\"nws\":true,\"plcs\":true,\"ppl\":true,\"prc\":true,\"pts\":true,\"rcp\":true,\"shop\":true,\"vid\":true},\"t\":null}],[64,{}],[105,{}],[22,{\"m_errors\":{\"32\":\"Sorry, no more results to show.\",\"default\":\"<font color=red>Error:</font> The server could not complete your request. Try again in 30 seconds.\"},\"m_tip\":\"Click for more information\"}],[77,{}],[84,{}],[99,{}],[29,{\"mcr\":5}],[92,{\"avgTtfc\":2000,\"fd\":1000,\"fl\":true,\"focus\":true,\"hpt\":250,\"kn\":true,\"mds\":\"clir,clue,dfn,evn,frim,klg,prc,rl,show,sp,sts,ww,mbl_he,mbl_hs,mbl_re,mbl_rs,mbl_sv,isch\",\"msg\":{\"dym\":\"Did you mean:\",\"gs\":\"Google Search\",\"kntt\":\"Use the up and down arrow keys to select each result. Press Enter to go to the selection.\",\"sif\":\"Search instead for\",\"srf\":\"Showing results for\"},\"odef\":true,\"ophe\":true,\"pq\":true,\"rpt\":41,\"tct\":\" ?\",\"tdur\":50}],[24,{}],[38,{}]]}"},"scroll":"0,0"}],"index":2,"hidden":false,"attributes":{"image":"http://www.google.co.uk/favicon.ico"},"storage":{"http://www.google.co.uk":{"web-v":"12_c9c918f0"}}}],"selected":1,"_closedTabs":[],"width":994,"height":688,"screenX":1650,"screenY":24,"sizemode":"normal","title":"Google"}],"selectedWindow":0,"_closedWindows":[{"tabs":[{"entries":[{"url":"about:home","title":"Mozilla Firefox Start Page","ID":0,"docshellID":5,"owner_b64":"NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAS8nfAAOr03buTZBMmukiq4HoizADOUR05MxABBLoP1AAAAAAAVhYm91dAAAAARob21l4NodcC97EdOM0ABgsPwUoweiLMAM5RHTkzEAEEug/UAAAAAADm1vei1zYWZlLWFib3V0AAAABGhvbWUAAAA="},{"url":"http://www.facebook.com/","title":"Welcome to Facebook - Log In, Sign Up or Learn More","ID":1,"docshellID":5,"docIdentifier":1,"formdata":{"//xhtml:div[#id='reg_form_box']/xhtml:table/xhtml:tbody/xhtml:tr[6]/xhtml:td[2]/xhtml:div/xhtml:div/xhtml:select":0,"//xhtml:div[#id='reg_form_box']/xhtml:table/xhtml:tbody/xhtml:tr[6]/xhtml:td[2]/xhtml:div/xhtml:div/xhtml:select[2]":0,"#sex":0,"#birthday_month":0,"#birthday_day":0,"#birthday_year":0},"scroll":"0,0"}],"index":2,"hidden":false,"attributes":{"image":"http://www.facebook.com/favicon.ico"}},{"entries":[{"url":"http://twitter.com/","title":"Twitter","ID":3,"docshellID":6,"docIdentifier":3,"children":[{"url":"http://api.twitter.com/receiver.html","ID":4,"docshellID":7,"referrer":"http://twitter.com/","docIdentifier":4,"scroll":"0,0"}],"formdata":{},"scroll":"0,0"}],"index":1,"hidden":false,"attributes":{"image":"http://twitter.com/phoenix/favicon.ico"}}],"selected":2,"_closedTabs":[],"width":994,"height":688,"screenX":1366,"screenY":307,"sizemode":"normal","cookies":[{"host":".facebook.com","value":"J4-69","path":"/","name":"lsd"},{"host":".facebook.com","value":"http%3A%2F%2Fwww.facebook.com%2F","path":"/","name":"reg_fb_gate"},{"host":".facebook.com","value":"http%3A%2F%2Fwww.facebook.com%2F","path":"/","name":"reg_fb_ref"},{"host":".facebook.com","value":"994x624","path":"/","name":"wd"},{"host":".twitter.com","value":"43838368","path":"/","name":"__utmc"},{"host":"twitter.com","value":"4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl","path":"/","name":"original_referer"},{"host":"scribe.twitter.com","value":"4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl","path":"/","name":"original_referer"},{"host":".twitter.com","value":"BAh7CToPY3JlYXRlZF9hdGwrCDoVZ%252F4vAToMY3NyZl9pZCIlODE2MGI1ZjJh%250AYmViNDMwODMxNDlkN2U5ZDg5Yjk4ZmU6B2lkIiU2N2I4YjdmNGExNWFkNzlk%250AODI0MDVjMGM1NmMzYjVhYSIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6%250ARmxhc2g6OkZsYXNoSGFzaHsABjoKQHVzZWR7AA%253D%253D--8b0d751e9774c5cfaa61fdec567cb782aa8757dd","path":"/","name":"_twitter_sess","httponly":true},{"host":".twitter.com","value":"43838368","path":"/","name":"__utmc"},{"host":"twitter.com","value":"4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl","path":"/","name":"original_referer"},{"host":"scribe.twitter.com","value":"4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl","path":"/","name":"original_referer"},{"host":".twitter.com","value":"BAh7CToPY3JlYXRlZF9hdGwrCDoVZ%252F4vAToMY3NyZl9pZCIlODE2MGI1ZjJh%250AYmViNDMwODMxNDlkN2U5ZDg5Yjk4ZmU6B2lkIiU2N2I4YjdmNGExNWFkNzlk%250AODI0MDVjMGM1NmMzYjVhYSIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6%250ARmxhc2g6OkZsYXNoSGFzaHsABjoKQHVzZWR7AA%253D%253D--8b0d751e9774c5cfaa61fdec567cb782aa8757dd","path":"/","name":"_twitter_sess","httponly":true}],"title":"Twitter"}],"session":{"state":"stopped","lastUpdate":1305658398727}}
and when I tried to load that with my program I got the error
Error: sessionstore.js(1): expected value
Since the file is formatted all on a single line, this meant the error could be anywhere in the file, so I ran it though a Javascript beautifier, keeping the default options, and pasted the results back into the original file and executed the program.
The formatted JSON is
{
"windows": [{
"tabs": [{
"entries": [{
"url": "about:home",
"title": "Mozilla Firefox Start Page",
"ID": 5,
"docshellID": 11,
"owner_b64": "NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAS8nfAAOr03buTZBMmukiq4HoizADOUR05MxABBLoP1AAAAAAAVhYm91dAAAAARob21l4NodcC97EdOM0ABgsPwUoweiLMAM5RHTkzEAEEug/UAAAAAADm1vei1zYWZlLWFib3V0AAAABGhvbWUAAAA=",
"docIdentifier": 5
}, {
"url": "http://www.google.co.uk/",
"title": "Google",
"ID": 6,
"docshellID": 11,
"docIdentifier": 6,
"children": [{
"url": "about:blank",
"ID": 7,
"docshellID": 12,
"owner_b64": "NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAd6UctCANBHTk5kAEEug/UAHoizADOUR05MxABBLoP1AAAAAAv////8AAABQAQAAABhodHRwOi8vd3d3Lmdvb2dsZS5jby51ay8AAAAAAAAABAAAAAcAAAAQAAAAB/////8AAAAH/////wAAAAcAAAAQAAAAFwAAAAEAAAAXAAAAAQAAABcAAAABAAAAGAAAAAAAAAAY/////wAAABf/////AAAAF/////8AAAAX/////wEAAAAAAAAAAAABAAA=",
"docIdentifier": 7,
"scroll": "0,0"
}],
"formdata": {
"#csi": "1",
"#hcache": "{\"BInSTfL-EtSt8QOl24nrCg\":[[69,{}],[14,{}],[60,{}],[81,{\"persisted\":true}],[42,{}],[43,{}],[83,{}],[95,{\"kfe\":{\"kfeHost\":\"clients1.google.co.uk\",\"kfeUrlPrefix\":\"/webpagethumbnail?r=2&f=2&s=300:585&query=&hl=en&gl=uk\",\"maxPrefetchConnections\":2,\"prefetch\":90,\"slowConnection\":false},\"logging\":{\"csiFraction\":0.05,\"gen204Fraction\":0.05},\"msgs\":{\"loading\":\"Still loading...\",\"mute\":\"Mute\",\"noPreview\":\"Preview not available\",\"sound\":\"Sound:\",\"soundOff\":\"off\",\"soundOn\":\"on\",\"unmute\":\"Unmute\"},\"pb\":{\"desiredHeight\":585,\"desiredWidth\":300,\"minHeight\":200,\"minWidth\":300},\"time\":{\"hoverClose\":300,\"hoverModeTimeout\":60,\"hoverOpen\":125,\"loading\":100,\"longHoverOpen\":725,\"prefetchOnLoad\":3000,\"timeout\":2500}}],[78,{}],[25,{\"m\":{\"bks\":true,\"blg\":true,\"dsc\":true,\"evn\":true,\"frm\":true,\"isch\":true,\"klg\":true,\"mbl\":true,\"nws\":true,\"plcs\":true,\"ppl\":true,\"prc\":true,\"pts\":true,\"rcp\":true,\"shop\":true,\"vid\":true},\"t\":null}],[64,{}],[105,{}],[22,{\"m_errors\":{\"32\":\"Sorry, no more results to show.\",\"default\":\"<font color=red>Error:</font> The server could not complete your request. Try again in 30 seconds.\"},\"m_tip\":\"Click for more information\"}],[77,{}],[84,{}],[99,{}],[29,{\"mcr\":5}],[92,{\"avgTtfc\":2000,\"fd\":1000,\"fl\":true,\"focus\":true,\"hpt\":250,\"kn\":true,\"mds\":\"clir,clue,dfn,evn,frim,klg,prc,rl,show,sp,sts,ww,mbl_he,mbl_hs,mbl_re,mbl_rs,mbl_sv,isch\",\"msg\":{\"dym\":\"Did you mean:\",\"gs\":\"Google Search\",\"kntt\":\"Use the up and down arrow keys to select each result. Press Enter to go to the selection.\",\"sif\":\"Search instead for\",\"srf\":\"Showing results for\"},\"odef\":true,\"ophe\":true,\"pq\":true,\"rpt\":41,\"tct\":\" ?\",\"tdur\":50}],[24,{}],[38,{}]]}"
},
"scroll": "0,0"
}],
"index": 2,
"hidden": false,
"attributes": {
"image": "http://www.google.co.uk/favicon.ico"
},
"storage": {
"http://www.google.co.uk": {
"web-v": "12_c9c918f0"
}
}
}],
"selected": 1,
"_closedTabs": [],
"width": 994,
"height": 688,
"screenX": 1650,
"screenY": 24,
"sizemode": "normal",
"title": "Google"
}],
"selectedWindow": 0,
"_closedWindows": [{
"tabs": [{
"entries": [{
"url": "about:home",
"title": "Mozilla Firefox Start Page",
"ID": 0,
"docshellID": 5,
"owner_b64": "NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAS8nfAAOr03buTZBMmukiq4HoizADOUR05MxABBLoP1AAAAAAAVhYm91dAAAAARob21l4NodcC97EdOM0ABgsPwUoweiLMAM5RHTkzEAEEug/UAAAAAADm1vei1zYWZlLWFib3V0AAAABGhvbWUAAAA="
}, {
"url": "http://www.facebook.com/",
"title": "Welcome to Facebook - Log In, Sign Up or Learn More",
"ID": 1,
"docshellID": 5,
"docIdentifier": 1,
"formdata": {
"//xhtml:div[#id='reg_form_box']/xhtml:table/xhtml:tbody/xhtml:tr[6]/xhtml:td[2]/xhtml:div/xhtml:div/xhtml:select": 0,
"//xhtml:div[#id='reg_form_box']/xhtml:table/xhtml:tbody/xhtml:tr[6]/xhtml:td[2]/xhtml:div/xhtml:div/xhtml:select[2]": 0,
"#sex": 0,
"#birthday_month": 0,
"#birthday_day": 0,
"#birthday_year": 0
},
"scroll": "0,0"
}],
"index": 2,
"hidden": false,
"attributes": {
"image": "http://www.facebook.com/favicon.ico"
}
}, {
"entries": [{
"url": "http://twitter.com/",
"title": "Twitter",
"ID": 3,
"docshellID": 6,
"docIdentifier": 3,
"children": [{
"url": "http://api.twitter.com/receiver.html",
"ID": 4,
"docshellID": 7,
"referrer": "http://twitter.com/",
"docIdentifier": 4,
"scroll": "0,0"
}],
"formdata": {},
"scroll": "0,0"
}],
"index": 1,
"hidden": false,
"attributes": {
"image": "http://twitter.com/phoenix/favicon.ico"
}
}],
"selected": 2,
"_closedTabs": [],
"width": 994,
"height": 688,
"screenX": 1366,
"screenY": 307,
"sizemode": "normal",
"cookies": [{
"host": ".facebook.com",
"value": "J4-69",
"path": "/",
"name": "lsd"
}, {
"host": ".facebook.com",
"value": "http%3A%2F%2Fwww.facebook.com%2F",
"path": "/",
"name": "reg_fb_gate"
}, {
"host": ".facebook.com",
"value": "http%3A%2F%2Fwww.facebook.com%2F",
"path": "/",
"name": "reg_fb_ref"
}, {
"host": ".facebook.com",
"value": "994x624",
"path": "/",
"name": "wd"
}, {
"host": ".twitter.com",
"value": "43838368",
"path": "/",
"name": "__utmc"
}, {
"host": "twitter.com",
"value": "4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl",
"path": "/",
"name": "original_referer"
}, {
"host": "scribe.twitter.com",
"value": "4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl",
"path": "/",
"name": "original_referer"
}, {
"host": ".twitter.com",
"value": "BAh7CToPY3JlYXRlZF9hdGwrCDoVZ%252F4vAToMY3NyZl9pZCIlODE2MGI1ZjJh%250AYmViNDMwODMxNDlkN2U5ZDg5Yjk4ZmU6B2lkIiU2N2I4YjdmNGExNWFkNzlk%250AODI0MDVjMGM1NmMzYjVhYSIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6%250ARmxhc2g6OkZsYXNoSGFzaHsABjoKQHVzZWR7AA%253D%253D--8b0d751e9774c5cfaa61fdec567cb782aa8757dd",
"path": "/",
"name": "_twitter_sess",
"httponly": true
}, {
"host": ".twitter.com",
"value": "43838368",
"path": "/",
"name": "__utmc"
}, {
"host": "twitter.com",
"value": "4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl",
"path": "/",
"name": "original_referer"
}, {
"host": "scribe.twitter.com",
"value": "4bfz%2B%2BmebEkRkMWFCXm%2FCUOsvDoVeFTl",
"path": "/",
"name": "original_referer"
}, {
"host": ".twitter.com",
"value": "BAh7CToPY3JlYXRlZF9hdGwrCDoVZ%252F4vAToMY3NyZl9pZCIlODE2MGI1ZjJh%250AYmViNDMwODMxNDlkN2U5ZDg5Yjk4ZmU6B2lkIiU2N2I4YjdmNGExNWFkNzlk%250AODI0MDVjMGM1NmMzYjVhYSIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6%250ARmxhc2g6OkZsYXNoSGFzaHsABjoKQHVzZWR7AA%253D%253D--8b0d751e9774c5cfaa61fdec567cb782aa8757dd",
"path": "/",
"name": "_twitter_sess",
"httponly": true
}],
"title": "Twitter"
}],
"session": {
"state": "stopped",
"lastUpdate": 1305658398727
}
}
The error
Error: sessionstore.js(179): expected value
now identifies the fault as being on the third-last line, the one that reads "lastUpdate": 1305658398727. From what I've read about the JSON format, this sounds to me like a comma or bracket is missing from this line, but this is a file that has been produced my Mozilla to work with Firefox, and I don't believe that they would make a mistake like that, so I am lead to believe that there is a problem with the JSON parser in Boost. Can anyone please confirm if this is the case, or if I'm the one doing something wrong?

I think the problem is this value is bigger than an int or a double. I don't know what data type uses BOOST JSON for reading numbers. To test this, just change the number to be a string and parse it again. In the standard, numbers are not limited, but you have to select a data type to represent them, and maybe they selected double, clearly not enough for this number. I'll take a look to see if you can configure the type used for numbers.
EDIT:
Looking again at the implementation, the "number" rule is implemented using Spirit as follows:
number
= strict_real_p
| int_p
;
Looking at Spirit strict_real_p uses double as the underlying type, and int_p actually uses an int.
The bad news is that, for what I see in the code, this is not configurable, so you have to change the JSON to be interpreted.

After receiving answers from Diego Sevilla and c-smile, I did a bit of Googling to figure out how I would incorporate their suggestions into Boost, since changing the JSON file unfortunately isn't an option in my case, and I came across this ticket on the Boost bug tracker that describes my exact problem. It has since been fixed and released with Boost 1.45. I, however, am using version 1.42 from the Ubuntu repositories, so will need to install the newer version manually.

As Diego said that is because 1305658398727 does not fit into neither strict_real_p nor int_p production.
I suspect you will need either other JSON parser or to modify Spirit definitions by yourself.
Either like this:
number
= strict_real_p
| int_p
| int64_p
;
or just as:
number
= real_p;
Ideally date/time in JSON should be presented by strings in ISO format. In this case you will not have such problems. I suspect that data there is just a number of milliseconds since 1970-01-01 (JavaScript Date.valueOf())