Pre-built custom sql.js for sqliteviz (#62)

* Proof-of-concept pre-built custom sql.js

* Rewrite Makefile as a couple of comprehensible Python scripts

* Add link to a blog post about transitive closure in SQLite

* Remove eval extension -- no much point as it only returns a string

* Consistently use existing Path objects

* Add basic tests scalar functions from extension-functions.c

* Test presence of functions from the rest of built extensions

* Use the same sqlite.com domain

* Add a couple SQLite compile flags that may make it a bit faster

* Add regexpi function test

* Add node about regexpi and REGEXP operator

* Workaround first build failure, rebuild lock file and minor fixes

lib/sql-js/Dockerfile

@@ -0,0 +1,9 @@
+FROM emscripten/emsdk:2.0.24
+
+WORKDIR /tmp/build
+
+COPY configure.py .
+RUN python3.8 configure.py
+
+COPY build.py .
+RUN python3.8 build.py

lib/sql-js/README.md

@@ -0,0 +1,73 @@
+# SQLite WebAssembly build
+
+This directory contains Docker-based build script, `make.sh`, that builds
+a custom version of [sql.js][1]. It allows sqliteviz to have more recent
+version of SQLite build with a number of useful extensions.
+
+`Makefile` from [sql.js][1] is rewritten as more comprehensible `configure.py`
+ and `build.py` Python scripts that run in `emscripten/emsdk` Docker container.
+
+## Extension
+
+SQLite [amalgamation][2] extensions included:
+
+1. [FTS5][4] -- virtual table module that provides full-text search
+   functionality
+
+SQLite [miscellaneous extensions][3] included:
+
+1. `generate_series` table-valued [series function][6] ([series.c][7])
+2. `transitive_closure` virtual table for
+   [Querying Tree Structures in SQLite][11] ([closure.c][8])
+3. `uuid`, `uuid_str` and `uuid_blob` RFC-4122 UUID functions ([uuid.c][9])
+4. `regexp` (hence `REGEXP` operator) and `regexpi` functions ([regexp.c][10])
+
+SQLite 3rd party extensions included:
+
+1. [pivot_vtab][5] -- a pivot virtual table
+
+To ease the step to have working clone locally, the build is committed into
+the repository.
+
+## Build method
+
+Basically it's extended amalgamation and `SQLITE_EXTRA_INIT` concisely
+described in [this message from SQLite Forum][12]:
+
+> Simply append it to the end of the amalgamation file. The real problem is
+> how you get the init function called. The easiest way (to me at any rate) is
+> to append a function (after the extensions you want to add are all appended)
+> that adds the init function for each extension to the auto extension list
+> for new connections, and set the pre-processor symbol SQLITE_EXTRA_INIT to
+> the name of this function. [...]
+>
+> An example `SQLITE_EXTRA_INIT` function looks like this:
+>
+> ```
+> int core_init(const char* dummy)
+> {
+>    int nErr = 0;
+>
+>    nErr += sqlite3_auto_extension((void*)sqlite3_autobusy_init);
+>    nErr += sqlite3_auto_extension((void*)sqlite3_ipaddress_init);
+>
+>    return nErr ? SQLITE_ERROR : SQLITE_OK;
+> }
+> ```
+>
+> so you would then define `SQLITE_EXTRA_INIT=core_init` when compiling the
+> amalgamation code and the extensions would thereafter be automatically
+> initialized on each connection.
+
+[1]:  https://github.com/sql-js/sql.js
+[2]:  https://sqlite.org/amalgamation.html
+[3]:  https://sqlite.org/src/dir?ci=trunk&name=ext/misc
+[4]:  https://sqlite.org/fts5.html
+[5]:  https://github.com/jakethaw/pivot_vtab
+[6]:  https://sqlite.org/series.html
+[7]:  https://sqlite.org/src/file/ext/misc/series.c
+[8]:  https://sqlite.org/src/file/ext/misc/closure.c
+[9]:  https://sqlite.org/src/file/ext/misc/uuid.c
+[10]: https://sqlite.org/src/file/ext/misc/regexp.c
+[11]: https://charlesleifer.com/blog/querying-tree-structures-in-sqlite-using-python-and-the-transitive-closure-extension/
+[12]: https://sqlite.org/forum/forumpost/6ad7d4f4bebe5e06?raw

lib/sql-js/build.py

@@ -0,0 +1,83 @@
+import logging
+import subprocess
+from pathlib import Path
+
+
+cflags = (
+    '-O2',
+    '-DSQLITE_OMIT_LOAD_EXTENSION',
+    '-DSQLITE_DISABLE_LFS',
+    '-DSQLITE_ENABLE_FTS3',
+    '-DSQLITE_ENABLE_FTS3_PARENTHESIS',
+    '-DSQLITE_ENABLE_FTS5',
+    '-DSQLITE_ENABLE_JSON1',
+    '-DSQLITE_THREADSAFE=0',
+    '-DSQLITE_ENABLE_NORMALIZE',
+    '-DSQLITE_EXTRA_INIT=extra_init',
+    '-DSQLITE_DEFAULT_MEMSTATUS=0',
+    '-DSQLITE_USE_ALLOCA',
+)
+emflags = (
+    # Base
+    '--memory-init-file', '0',
+    '-s', 'RESERVED_FUNCTION_POINTERS=64',
+    '-s', 'ALLOW_TABLE_GROWTH=1',
+    '-s', 'SINGLE_FILE=0',
+    # WASM
+    '-s', 'WASM=1',
+    '-s', 'ALLOW_MEMORY_GROWTH=1',
+    # Optimisation
+    '-s', 'INLINING_LIMIT=50',
+    '-O3',
+    '-flto',
+    '--closure', '1',
+    # sql.js
+    '-s', 'EXPORTED_FUNCTIONS=@src/sqljs/exported_functions.json',
+    '-s', 'EXPORTED_RUNTIME_METHODS=@src/sqljs/exported_runtime_methods.json',
+    '--pre-js', 'src/sqljs/api.js',
+)
+
+
+def build(src: Path, dst: Path):
+    out = Path('out')
+    out.mkdir()
+
+    logging.info('Building LLVM bitcode for sqlite3.c')
+    subprocess.check_call([
+        'emcc',
+        *cflags,
+        '-c', src / 'sqlite3.c',
+        '-o', out / 'sqlite3.bc',
+    ])
+    logging.info('Building LLVM bitcode for extension-functions.c')
+    subprocess.check_call([
+        'emcc',
+        *cflags,
+        '-c', src / 'extension-functions.c',
+        '-o', out / 'extension-functions.bc',
+    ])
+
+    logging.info('Building WASM from bitcode')
+    subprocess.check_call([
+        'emcc',
+        *emflags,
+        out / 'sqlite3.bc',
+        out / 'extension-functions.bc',
+        '-o', out / 'sql-wasm.js',
+    ])
+
+    logging.info('Post-processing build and copying to dist')
+    (out / 'sql-wasm.wasm').rename(dst / 'sql-wasm.wasm')
+    with (dst / 'sql-wasm.js').open('w') as f:
+        f.write((src / 'sqljs' / 'shell-pre.js').read_text())
+        f.write((out / 'sql-wasm.js').read_text())
+        f.write((src / 'sqljs' / 'shell-post.js').read_text())
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level='INFO', format='%(asctime)s %(levelname)s %(name)s %(message)s')
+
+    src = Path('src')
+    dst = Path('dist')
+    dst.mkdir()
+    build(src, dst)

lib/sql-js/configure.py

@@ -0,0 +1,105 @@
+import logging
+import shutil
+import subprocess
+import sys
+import zipfile
+from io import BytesIO
+from pathlib import Path
+from urllib import request
+
+
+amalgamation_url = 'https://sqlite.org/2021/sqlite-amalgamation-3360000.zip'
+
+# Extension-functions
+# ===================
+# It breaks amalgamation if appended as other extension because it redefines
+# several functions, so build it separately. Note that sql.js registers these
+# extension functions by calling ``registerExtensionFunctions`` itself.
+contrib_functions_url = 'https://sqlite.org/contrib/download/extension-functions.c?get=25'
+
+extension_urls = (
+    # Miscellaneous extensions
+    # ========================
+    ('https://sqlite.org/src/raw/c6bd5d24?at=series.c', 'sqlite3_series_init'),
+    ('https://sqlite.org/src/raw/dbfd8543?at=closure.c', 'sqlite3_closure_init'),
+    ('https://sqlite.org/src/raw/5bb2264c?at=uuid.c', 'sqlite3_uuid_init'),
+    ('https://sqlite.org/src/raw/5853b0e5?at=regexp.c', 'sqlite3_regexp_init'),
+    # Third-party extension
+    # =====================
+    ('https://github.com/jakethaw/pivot_vtab/raw/08ab0797/pivot_vtab.c', 'sqlite3_pivotvtab_init'),
+)
+
+sqljs_url = 'https://github.com/sql-js/sql.js/archive/refs/tags/v1.5.0.zip'
+
+
+def _generate_extra_init_c_function(init_function_names):
+    auto_ext_calls = '\n'.join([
+        'nErr += sqlite3_auto_extension((void*){});'.format(init_fn)
+        for init_fn in init_function_names
+    ])
+    return '''
+        int extra_init(const char* dummy)
+        {
+            int nErr = 0;
+            %s
+            return nErr ? SQLITE_ERROR : SQLITE_OK;
+        }
+    ''' % auto_ext_calls
+
+
+def _get_amalgamation(tgt: Path):
+    logging.info('Downloading and extracting SQLite amalgamation %s', amalgamation_url)
+    archive = zipfile.ZipFile(BytesIO(request.urlopen(amalgamation_url).read()))
+    archive_root_dir = zipfile.Path(archive, archive.namelist()[0])
+    for zpath in archive_root_dir.iterdir():
+        with zpath.open() as fr, (tgt / zpath.name).open('wb') as fw:
+            shutil.copyfileobj(fr, fw)
+
+
+def _get_contrib_functions(tgt: Path):
+    request.urlretrieve(contrib_functions_url, tgt / 'extension-functions.c')
+
+
+def _get_extensions(tgt: Path):
+    init_functions = []
+    sqlite3_c = tgt / 'sqlite3.c'
+    with sqlite3_c.open('ab') as f:
+        for url, init_fn in extension_urls:
+            logging.info('Downloading and appending to amalgamation %s', url)
+            with request.urlopen(url) as resp:
+                shutil.copyfileobj(resp, f)
+            init_functions.append(init_fn)
+
+        logging.info('Appending SQLITE_EXTRA_INIT to amalgamation')
+        f.write(_generate_extra_init_c_function(init_functions).encode())
+
+
+def _get_sqljs(tgt: Path):
+    logging.info('Downloading and extracting sql.js %s', sqljs_url)
+    archive = zipfile.ZipFile(BytesIO(request.urlopen(sqljs_url).read()))
+    archive_root_dir = zipfile.Path(archive, archive.namelist()[0])
+    (tgt / 'sqljs').mkdir()
+    for zpath in (archive_root_dir / 'src').iterdir():
+        with zpath.open() as fr, (tgt / 'sqljs' / zpath.name).open('wb') as fw:
+            shutil.copyfileobj(fr, fw)
+
+
+def configure(tgt: Path):
+    _get_amalgamation(tgt)
+    _get_contrib_functions(tgt)
+    _get_extensions(tgt)
+    _get_sqljs(tgt)
+
+    subprocess.check_call(['emcc', '--version'])
+
+
+if __name__ == '__main__':
+    if sys.version_info < (3, 8):
+        print('Python 3.8 or higher is expected', file=sys.stderr)
+        sys.exit(1)
+
+    logging.basicConfig(level='INFO', format='%(asctime)s %(levelname)s %(name)s %(message)s')
+
+    src = Path('src')
+    src.mkdir()
+    configure(src)

lib/sql-js/dist/sql-wasm.js

@@ -0,0 +1,201 @@
+
+// We are modularizing this manually because the current modularize setting in Emscripten has some issues:
+// https://github.com/kripken/emscripten/issues/5820
+// In addition, When you use emcc's modularization, it still expects to export a global object called `Module`,
+// which is able to be used/called before the WASM is loaded.
+// The modularization below exports a promise that loads and resolves to the actual sql.js module.
+// That way, this module can't be used before the WASM is finished loading.
+
+// We are going to define a function that a user will call to start loading initializing our Sql.js library
+// However, that function might be called multiple times, and on subsequent calls, we don't actually want it to instantiate a new instance of the Module
+// Instead, we want to return the previously loaded module
+
+// TODO: Make this not declare a global if used in the browser
+var initSqlJsPromise = undefined;
+
+var initSqlJs = function (moduleConfig) {
+
+    if (initSqlJsPromise){
+      return initSqlJsPromise;
+    }
+    // If we're here, we've never called this function before
+    initSqlJsPromise = new Promise(function (resolveModule, reject) {
+
+        // We are modularizing this manually because the current modularize setting in Emscripten has some issues:
+        // https://github.com/kripken/emscripten/issues/5820
+
+        // The way to affect the loading of emcc compiled modules is to create a variable called `Module` and add
+        // properties to it, like `preRun`, `postRun`, etc
+        // We are using that to get notified when the WASM has finished loading.
+        // Only then will we return our promise
+
+        // If they passed in a moduleConfig object, use that
+        // Otherwise, initialize Module to the empty object
+        var Module = typeof moduleConfig !== 'undefined' ? moduleConfig : {};
+
+        // EMCC only allows for a single onAbort function (not an array of functions)
+        // So if the user defined their own onAbort function, we remember it and call it
+        var originalOnAbortFunction = Module['onAbort'];
+        Module['onAbort'] = function (errorThatCausedAbort) {
+            reject(new Error(errorThatCausedAbort));
+            if (originalOnAbortFunction){
+              originalOnAbortFunction(errorThatCausedAbort);
+            }
+        };
+
+        Module['postRun'] = Module['postRun'] || [];
+        Module['postRun'].push(function () {
+            // When Emscripted calls postRun, this promise resolves with the built Module
+            resolveModule(Module);
+        });
+
+        // There is a section of code in the emcc-generated code below that looks like this:
+        // (Note that this is lowercase `module`)
+        // if (typeof module !== 'undefined') {
+        //     module['exports'] = Module;
+        // }
+        // When that runs, it's going to overwrite our own modularization export efforts in shell-post.js!
+        // The only way to tell emcc not to emit it is to pass the MODULARIZE=1 or MODULARIZE_INSTANCE=1 flags,
+        // but that carries with it additional unnecessary baggage/bugs we don't want either.
+        // So, we have three options:
+        // 1) We undefine `module`
+        // 2) We remember what `module['exports']` was at the beginning of this function and we restore it later
+        // 3) We write a script to remove those lines of code as part of the Make process.
+        //
+        // Since those are the only lines of code that care about module, we will undefine it. It's the most straightforward
+        // of the options, and has the side effect of reducing emcc's efforts to modify the module if its output were to change in the future.
+        // That's a nice side effect since we're handling the modularization efforts ourselves
+        module = undefined;
+
+        // The emcc-generated code and shell-post.js code goes below,
+        // meaning that all of it runs inside of this promise. If anything throws an exception, our promise will abort
+
+var e;e||(e=typeof Module !== 'undefined' ? Module : {});null;
+e.onRuntimeInitialized=function(){function a(h,l){this.Ra=h;this.db=l;this.Qa=1;this.lb=[]}function b(h,l){this.db=l;l=ba(h)+1;this.eb=ca(l);if(null===this.eb)throw Error("Unable to allocate memory for the SQL string");k(h,n,this.eb,l);this.jb=this.eb;this.$a=this.pb=null}function c(h){this.filename="dbfile_"+(4294967295*Math.random()>>>0);if(null!=h){var l=this.filename,p=l?r("//"+l):"/";l=da(!0,!0);p=ea(p,(void 0!==l?l:438)&4095|32768,0);if(h){if("string"===typeof h){for(var q=Array(h.length),B=
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+f=-1}return f}};
+(function(){function a(f){e.asm=f.exports;Pa=e.asm.L;Za();K=e.asm.Da;ab.unshift(e.asm.M);db--;e.monitorRunDependencies&&e.monitorRunDependencies(db);0==db&&(null!==eb&&(clearInterval(eb),eb=null),fb&&(f=fb,fb=null,f()))}function b(f){a(f.instance)}function c(f){return jb().then(function(g){return WebAssembly.instantiate(g,d)}).then(f,function(g){J("failed to asynchronously prepare wasm: "+g);I(g)})}var d={a:cd};db++;e.monitorRunDependencies&&e.monitorRunDependencies(db);if(e.instantiateWasm)try{return e.instantiateWasm(d,a)}catch(f){return J("Module.instantiateWasm callback failed with error: "+
+f),!1}(function(){return La||"function"!==typeof WebAssembly.instantiateStreaming||gb()||O.startsWith("file://")||"function"!==typeof fetch?c(b):fetch(O,{credentials:"same-origin"}).then(function(f){return WebAssembly.instantiateStreaming(f,d).then(b,function(g){J("wasm streaming compile failed: "+g);J("falling back to ArrayBuffer instantiation");return c(b)})})})();return{}})();e.___wasm_call_ctors=function(){return(e.___wasm_call_ctors=e.asm.M).apply(null,arguments)};
+var bd=e._memset=function(){return(bd=e._memset=e.asm.N).apply(null,arguments)};e._sqlite3_free=function(){return(e._sqlite3_free=e.asm.O).apply(null,arguments)};var $c=e.___errno_location=function(){return($c=e.___errno_location=e.asm.P).apply(null,arguments)};e._sqlite3_step=function(){return(e._sqlite3_step=e.asm.Q).apply(null,arguments)};e._sqlite3_finalize=function(){return(e._sqlite3_finalize=e.asm.R).apply(null,arguments)};
+e._sqlite3_prepare_v2=function(){return(e._sqlite3_prepare_v2=e.asm.S).apply(null,arguments)};e._sqlite3_reset=function(){return(e._sqlite3_reset=e.asm.T).apply(null,arguments)};e._sqlite3_clear_bindings=function(){return(e._sqlite3_clear_bindings=e.asm.U).apply(null,arguments)};e._sqlite3_value_blob=function(){return(e._sqlite3_value_blob=e.asm.V).apply(null,arguments)};e._sqlite3_value_text=function(){return(e._sqlite3_value_text=e.asm.W).apply(null,arguments)};
+e._sqlite3_value_bytes=function(){return(e._sqlite3_value_bytes=e.asm.X).apply(null,arguments)};e._sqlite3_value_double=function(){return(e._sqlite3_value_double=e.asm.Y).apply(null,arguments)};e._sqlite3_value_int=function(){return(e._sqlite3_value_int=e.asm.Z).apply(null,arguments)};e._sqlite3_value_type=function(){return(e._sqlite3_value_type=e.asm._).apply(null,arguments)};e._sqlite3_result_blob=function(){return(e._sqlite3_result_blob=e.asm.$).apply(null,arguments)};
+e._sqlite3_result_double=function(){return(e._sqlite3_result_double=e.asm.aa).apply(null,arguments)};e._sqlite3_result_error=function(){return(e._sqlite3_result_error=e.asm.ba).apply(null,arguments)};e._sqlite3_result_int=function(){return(e._sqlite3_result_int=e.asm.ca).apply(null,arguments)};e._sqlite3_result_int64=function(){return(e._sqlite3_result_int64=e.asm.da).apply(null,arguments)};e._sqlite3_result_null=function(){return(e._sqlite3_result_null=e.asm.ea).apply(null,arguments)};
+e._sqlite3_result_text=function(){return(e._sqlite3_result_text=e.asm.fa).apply(null,arguments)};e._sqlite3_column_count=function(){return(e._sqlite3_column_count=e.asm.ga).apply(null,arguments)};e._sqlite3_data_count=function(){return(e._sqlite3_data_count=e.asm.ha).apply(null,arguments)};e._sqlite3_column_blob=function(){return(e._sqlite3_column_blob=e.asm.ia).apply(null,arguments)};e._sqlite3_column_bytes=function(){return(e._sqlite3_column_bytes=e.asm.ja).apply(null,arguments)};
+e._sqlite3_column_double=function(){return(e._sqlite3_column_double=e.asm.ka).apply(null,arguments)};e._sqlite3_column_text=function(){return(e._sqlite3_column_text=e.asm.la).apply(null,arguments)};e._sqlite3_column_type=function(){return(e._sqlite3_column_type=e.asm.ma).apply(null,arguments)};e._sqlite3_column_name=function(){return(e._sqlite3_column_name=e.asm.na).apply(null,arguments)};e._sqlite3_bind_blob=function(){return(e._sqlite3_bind_blob=e.asm.oa).apply(null,arguments)};
+e._sqlite3_bind_double=function(){return(e._sqlite3_bind_double=e.asm.pa).apply(null,arguments)};e._sqlite3_bind_int=function(){return(e._sqlite3_bind_int=e.asm.qa).apply(null,arguments)};e._sqlite3_bind_text=function(){return(e._sqlite3_bind_text=e.asm.ra).apply(null,arguments)};e._sqlite3_bind_parameter_index=function(){return(e._sqlite3_bind_parameter_index=e.asm.sa).apply(null,arguments)};e._sqlite3_sql=function(){return(e._sqlite3_sql=e.asm.ta).apply(null,arguments)};
+e._sqlite3_normalized_sql=function(){return(e._sqlite3_normalized_sql=e.asm.ua).apply(null,arguments)};e._sqlite3_errmsg=function(){return(e._sqlite3_errmsg=e.asm.va).apply(null,arguments)};e._sqlite3_exec=function(){return(e._sqlite3_exec=e.asm.wa).apply(null,arguments)};e._sqlite3_changes=function(){return(e._sqlite3_changes=e.asm.xa).apply(null,arguments)};e._sqlite3_close_v2=function(){return(e._sqlite3_close_v2=e.asm.ya).apply(null,arguments)};
+e._sqlite3_create_function_v2=function(){return(e._sqlite3_create_function_v2=e.asm.za).apply(null,arguments)};e._sqlite3_open=function(){return(e._sqlite3_open=e.asm.Aa).apply(null,arguments)};var ca=e._malloc=function(){return(ca=e._malloc=e.asm.Ba).apply(null,arguments)},oa=e._free=function(){return(oa=e._free=e.asm.Ca).apply(null,arguments)};e._RegisterExtensionFunctions=function(){return(e._RegisterExtensionFunctions=e.asm.Ea).apply(null,arguments)};
+var qb=e.__get_tzname=function(){return(qb=e.__get_tzname=e.asm.Fa).apply(null,arguments)},pb=e.__get_daylight=function(){return(pb=e.__get_daylight=e.asm.Ga).apply(null,arguments)},ob=e.__get_timezone=function(){return(ob=e.__get_timezone=e.asm.Ha).apply(null,arguments)},pa=e.stackSave=function(){return(pa=e.stackSave=e.asm.Ia).apply(null,arguments)},ra=e.stackRestore=function(){return(ra=e.stackRestore=e.asm.Ja).apply(null,arguments)},y=e.stackAlloc=function(){return(y=e.stackAlloc=e.asm.Ka).apply(null,
+arguments)},ad=e._memalign=function(){return(ad=e._memalign=e.asm.La).apply(null,arguments)};e.cwrap=function(a,b,c,d){c=c||[];var f=c.every(function(g){return"number"===g});return"string"!==b&&f&&!d?Ra(a):function(){return Sa(a,b,c,arguments)}};e.UTF8ToString=A;e.stackSave=pa;e.stackRestore=ra;e.stackAlloc=y;var dd;fb=function ed(){dd||fd();dd||(fb=ed)};
+function fd(){function a(){if(!dd&&(dd=!0,e.calledRun=!0,!Qa)){e.noFSInit||Pc||(Pc=!0,Oc(),e.stdin=e.stdin,e.stdout=e.stdout,e.stderr=e.stderr,e.stdin?Qc("stdin",e.stdin):cc("/dev/tty","/dev/stdin"),e.stdout?Qc("stdout",null,e.stdout):cc("/dev/tty","/dev/stdout"),e.stderr?Qc("stderr",null,e.stderr):cc("/dev/tty1","/dev/stderr"),v("/dev/stdin",0),v("/dev/stdout",1),v("/dev/stderr",1));Nb=!1;kb(ab);if(e.onRuntimeInitialized)e.onRuntimeInitialized();if(e.postRun)for("function"==typeof e.postRun&&(e.postRun=
+[e.postRun]);e.postRun.length;){var b=e.postRun.shift();bb.unshift(b)}kb(bb)}}if(!(0<db)){if(e.preRun)for("function"==typeof e.preRun&&(e.preRun=[e.preRun]);e.preRun.length;)cb();kb($a);0<db||(e.setStatus?(e.setStatus("Running..."),setTimeout(function(){setTimeout(function(){e.setStatus("")},1);a()},1)):a())}}e.run=fd;if(e.preInit)for("function"==typeof e.preInit&&(e.preInit=[e.preInit]);0<e.preInit.length;)e.preInit.pop()();fd();
+
+
+        // The shell-pre.js and emcc-generated code goes above
+        return Module;
+    }); // The end of the promise being returned
+
+  return initSqlJsPromise;
+} // The end of our initSqlJs function
+
+// This bit below is copied almost exactly from what you get when you use the MODULARIZE=1 flag with emcc
+// However, we don't want to use the emcc modularization. See shell-pre.js
+if (typeof exports === 'object' && typeof module === 'object'){
+    module.exports = initSqlJs;
+    // This will allow the module to be used in ES6 or CommonJS
+    module.exports.default = initSqlJs;
+}
+else if (typeof define === 'function' && define['amd']) {
+    define([], function() { return initSqlJs; });
+}
+else if (typeof exports === 'object'){
+    exports["Module"] = initSqlJs;
+}

lib/sql-js/make.sh

@@ -0,0 +1,9 @@
+#!/bin/bash -e
+
+docker build -t sqliteviz/sqljs .
+
+rm -r dist || true
+
+CONTAINER=$(docker create sqliteviz/sqljs)
+docker cp $CONTAINER:/tmp/build/dist .
+docker rm $CONTAINER

lib/sql-js/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "sql.js",
+  "main": "./dist/sql-wasm.js"
+}

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "sqliteviz",
-  "version": "0.13.0",
+  "version": "0.13.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "sqliteviz",
-      "version": "0.13.0",
+      "version": "0.13.1",
       "license": "Apache-2.0",
       "dependencies": {
         "codemirror": "^5.57.0",
@@ -18,7 +18,7 @@
         "react": "^16.13.1",
         "react-chart-editor": "^0.45.0",
         "react-dom": "^16.13.1",
-        "sql.js": "^1.5.0",
+        "sql.js": "file:./lib/sql-js",
         "sqlite-parser": "^1.0.1",
         "vue": "^2.6.11",
         "vue-codemirror": "^4.0.6",
@@ -54,6 +54,7 @@
         "worker-loader": "^3.0.8"
       }
     },
+    "lib/sql-js": {},
     "node_modules/@babel/code-frame": {
       "version": "7.12.13",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.13.tgz",
@@ -2530,7 +2531,6 @@
         "merge-source-map": "^1.1.0",
         "postcss": "^7.0.14",
         "postcss-selector-parser": "^6.0.2",
-        "prettier": "^1.18.2",
         "source-map": "~0.6.1",
         "vue-template-es2015-compiler": "^1.9.0"
       },
@@ -7947,8 +7947,7 @@
         "esprima": "^4.0.1",
         "estraverse": "^4.2.0",
         "esutils": "^2.0.2",
-        "optionator": "^0.8.1",
+        "optionator": "^0.8.1"
-        "source-map": "~0.6.1"
       },
       "bin": {
         "escodegen": "bin/escodegen.js",
@@ -10757,7 +10756,6 @@
         "minimist": "^1.2.5",
         "neo-async": "^2.6.0",
         "source-map": "^0.6.1",
-        "uglify-js": "^3.1.4",
         "wordwrap": "^1.0.0"
       },
       "bin": {
@@ -12543,8 +12541,7 @@
         "esprima": "^2.7.1",
         "estraverse": "^1.9.1",
         "esutils": "^2.0.2",
-        "optionator": "^0.8.1",
+        "optionator": "^0.8.1"
-        "source-map": "~0.2.0"
       },
       "bin": {
         "escodegen": "bin/escodegen.js",
@@ -13149,7 +13146,6 @@
         "anymatch": "^2.0.0",
         "async-each": "^1.0.1",
         "braces": "^2.3.2",
-        "fsevents": "^1.2.7",
         "glob-parent": "^3.1.0",
         "inherits": "^2.0.3",
         "is-binary-path": "^1.0.0",
@@ -18331,9 +18327,6 @@
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.46.0.tgz",
       "integrity": "sha512-qPGoUBNl+Z8uNu0z7pD3WPTABWRbcOwIrO/5ccDJzmrtzn0LVf6Lj91+L5CcWhXl6iWf23FQ6m8Jkl2CmN1O7Q==",
       "dev": true,
-      "dependencies": {
-        "fsevents": "~2.3.1"
-      },
       "bin": {
         "rollup": "dist/bin/rollup"
       },
@@ -19440,9 +19433,8 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
     },
     "node_modules/sql.js": {
-      "version": "1.5.0",
+      "resolved": "lib/sql-js",
-      "resolved": "https://registry.npmjs.org/sql.js/-/sql.js-1.5.0.tgz",
+      "link": true
-      "integrity": "sha512-Qqr6HgX/hCDpLFWdN0BNoNpYQ2c1tOl1c3HGI0cshjaFSAWszKICuLZ9CyFUvRFPpEGW8RzHzwuXWWvXVGTKBg=="
     },
     "node_modules/sqlite-parser": {
       "version": "1.0.1",
@@ -21618,7 +21610,6 @@
       "peer": true,
       "dependencies": {
         "source-map": "~0.5.1",
-        "uglify-to-browserify": "~1.0.0",
         "yargs": "~3.10.0"
       },
       "bin": {
@@ -22008,10 +21999,8 @@
       "integrity": "sha512-ymVbbQP40MFTp+cNMvpyBpBtygHnPzPkHqoIwRRj/0B8KhqQwV8LaKjtbaxF2lK4vl8zN9wCxS46IFCU5K4W0g==",
       "dev": true,
       "dependencies": {
-        "chokidar": "^3.4.0",
         "graceful-fs": "^4.1.2",
-        "neo-async": "^2.5.0",
+        "neo-async": "^2.5.0"
-        "watchpack-chokidar2": "^2.0.0"
       },
       "optionalDependencies": {
         "chokidar": "^3.4.0",
@@ -22412,7 +22401,6 @@
         "anymatch": "^2.0.0",
         "async-each": "^1.0.1",
         "braces": "^2.3.2",
-        "fsevents": "^1.2.7",
         "glob-parent": "^3.1.0",
         "inherits": "^2.0.3",
         "is-binary-path": "^1.0.0",
@@ -22782,7 +22770,6 @@
       "integrity": "sha512-5dgndWOriYSm5cnYaJNhalLNDKOqFwyDB/rr1E9ZsGciGvKPs8R2xYGCacuf3z6K1YKDz182fd+fY3cn3pMqXQ==",
       "dev": true,
       "dependencies": {
-        "graceful-fs": "^4.1.6",
         "universalify": "^2.0.0"
       },
       "optionalDependencies": {
@@ -40106,9 +40093,7 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
     },
     "sql.js": {
-      "version": "1.5.0",
+      "version": "file:lib/sql-js"
-      "resolved": "https://registry.npmjs.org/sql.js/-/sql.js-1.5.0.tgz",
-      "integrity": "sha512-Qqr6HgX/hCDpLFWdN0BNoNpYQ2c1tOl1c3HGI0cshjaFSAWszKICuLZ9CyFUvRFPpEGW8RzHzwuXWWvXVGTKBg=="
     },
     "sqlite-parser": {
       "version": "1.0.1",

package.json

@@ -19,7 +19,6 @@
     "react": "^16.13.1",
     "react-chart-editor": "^0.45.0",
     "react-dom": "^16.13.1",
-    "sql.js": "^1.5.0",
     "sqlite-parser": "^1.0.1",
     "vue": "^2.6.11",
     "vue-codemirror": "^4.0.6",
@@ -27,7 +26,8 @@
     "vue-router": "^3.2.0",
     "vuejs-paginate": "^2.1.0",
     "vuera": "^0.2.7",
-    "vuex": "^3.4.0"
+    "vuex": "^3.4.0",
+    "sql.js": "file:./lib/sql-js"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "^4.4.0",

tests/lib/database/sqliteExtensions.spec.js

@@ -0,0 +1,238 @@
+import chai from 'chai'
+import database from '@/lib/database'
+
+const expect = chai.expect
+
+describe('SQLite extensions', function () {
+  let db
+
+  beforeEach(() => {
+    db = database.getNewDatabase()
+  })
+
+  afterEach(() => {
+    db.shutDown()
+  })
+
+  it('supports contrib trigonometric functions', async function () {
+    const actual = await db.execute(`
+      SELECT
+        abs(3.1415926 - pi())       < 0.000001,
+        abs(1 - cos(2 * pi()))      < 0.000001,
+        abs(0 - sin(pi()))          < 0.000001,
+        abs(0 - tan(0))             < 0.000001,
+        abs(0 - cot(pi() / 2))      < 0.000001,
+        abs(1 - acos(cos(1)))       < 0.000001,
+        abs(1 - asin(sin(1)))       < 0.000001,
+        abs(1 - atan(tan(1)))       < 0.000001,
+        abs(1 - cosh(0))            < 0.000001,
+        abs(0 - sinh(0))            < 0.000001,
+        abs(tanh(1) + tanh(-1))     < 0.000001,
+        abs(coth(1) + coth(-1))     < 0.000001,
+        abs(1 - acosh(cosh(1)))     < 0.000001,
+        abs(1 - asinh(sinh(1)))     < 0.000001,
+        abs(1 - atanh(tanh(1)))     < 0.000001,
+        abs(180 - degrees(pi()))    < 0.000001,
+        abs(pi() - radians(180))    < 0.000001,
+        abs(pi() / 2 - atan2(1, 0)) < 0.000001
+    `)
+    expect(actual.values).to.eql([[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]])
+  })
+
+  it('supports contrib math functions', async function () {
+    const actual = await db.execute(`
+      SELECT
+        exp(0),
+        log(exp(1)),
+        log10(10000),
+        power(2, 3),
+        sign(-10) + sign(20),
+        sqrt(square(16)),
+        ceil(-1.95) + ceil(1.95),
+        floor(-1.95) + floor(1.95)
+    `)
+    expect(actual.values).to.eql([[1, 1, 4, 8, 0, 16, 1, -1]])
+  })
+
+  it('supports contrib string functions', async function () {
+    const actual = await db.execute(`
+      SELECT
+        replicate('ab', 4),
+        charindex('ab', 'foobarabbarfoo'),
+        charindex('ab', 'foobarabbarfoo', 8),
+        leftstr('foobar', 2),
+        rightstr('foobar', 2),
+        reverse('foobar'),
+        proper('fooBar'),
+        padl('foo', 5),
+        padr('foo', 5),
+        padc('foo', 5),
+        strfilter('abcba', 'bc')
+    `)
+    expect(actual.values).to.eql([
+      ['abababab', 7, 0, 'fo', 'ar', 'raboof', 'Foobar', '  foo', 'foo  ', ' foo ', 'bcb']
+    ])
+  })
+
+  it('supports contrib aggregate functions', async function () {
+    const actual = await db.execute(`
+      WITH RECURSIVE series(x) AS (
+          SELECT 1
+        UNION ALL
+          SELECT x + 1
+          FROM series
+          WHERE x + 1 <= 12
+      )
+      SELECT
+        abs( 3.77406806 - stdev(x))    < 0.000001,
+        abs(14.24358974 - variance(x)) < 0.000001,
+        mode(x),
+        median(x),
+        lower_quartile(x),
+        upper_quartile(x)
+      FROM (
+        SELECT x
+        FROM series
+        UNION ALL
+        VALUES (1)
+      )
+    `)
+    expect(actual.values).to.eql([[1, 1, 1, 6, 3, 9]])
+  })
+
+  it('supports generate_series', async function () {
+    const actual = await db.execute(`
+      SELECT value
+      FROM generate_series(5, 20, 5)
+    `)
+    expect(actual.values).to.eql([[5], [10], [15], [20]])
+  })
+
+  it('supports transitive_closure', async function () {
+    const actual = await db.execute(`
+      CREATE TABLE node(
+      node_id   INTEGER NOT NULL PRIMARY KEY,
+      parent_id INTEGER,
+      name      VARCHAR(127),
+      FOREIGN KEY (parent_id) REFERENCES node(node_id)
+    );
+    CREATE INDEX node_parent_id_idx ON node(parent_id);
+
+    CREATE VIRTUAL TABLE node_closure USING transitive_closure(
+        tablename    = "node",
+        idcolumn     = "node_id",
+        parentcolumn = "parent_id"
+      );
+
+    INSERT INTO node VALUES
+      (1,  NULL, 'tests'),
+      (2,  1,    'lib'),
+      (3,  2,    'database'),
+      (4,  2,    'utils'),
+      (5,  2,    'storedQueries.spec.js'),
+      (6,  3,    '_sql.spec.js'),
+      (7,  3,    '_statements.spec.js'),
+      (8,  3,    'database.spec.js'),
+      (9,  3,    'sqliteExtensions.spec.js'),
+      (10, 4,    'fileIo.spec.js'),
+      (11, 4,    'time.spec.js');
+
+      SELECT name
+      FROM node
+      WHERE node_id IN (
+        SELECT nc.id
+        FROM node_closure AS nc
+        WHERE nc.root = 2 AND nc.depth = 2
+      );
+    `)
+    expect(actual.values).to.eql([
+      ['_sql.spec.js'],
+      ['_statements.spec.js'],
+      ['database.spec.js'],
+      ['sqliteExtensions.spec.js'],
+      ['fileIo.spec.js'],
+      ['time.spec.js']
+    ])
+  })
+
+  it('supports UUID functions', async function () {
+    const actual = await db.execute(`
+      SELECT
+        length(uuid()),
+        uuid_str(uuid_blob('26a8349c8a7f4cbeb519bf792c3d7ac6'))
+    `)
+    expect(actual.values).to.eql([[36, '26a8349c-8a7f-4cbe-b519-bf792c3d7ac6']])
+  })
+
+  it('supports regexp', async function () {
+    const actual = await db.execute(`
+      SELECT
+        regexp('=\\s?\\d+',  'const foo = 123; const bar = "bar"'),
+        regexpi('=\\s?\\d+', 'const foo = 123; const bar = "bar"'),
+        'const foo = 123; const bar = "bar"' REGEXP '=\\s?\\d+'
+    `)
+    expect(actual.values).to.eql([[1, 1, 1]])
+  })
+
+  it('supports pivot virtual table', async function () {
+    const actual = await db.execute(`
+      CREATE TABLE point(x REAL, y REAL, z REAL);
+      INSERT INTO point VALUES
+        (5,3,3.2),  (5,6,4.3),  (5,9,5.4),
+        (10,3,4),   (10,6,3.8), (10,9,3.6),
+        (15,3,4.8), (15,6,4),   (15,9,3.5);
+
+      CREATE VIRTUAL TABLE pivot USING pivot_vtab(
+        (SELECT y FROM point GROUP BY y),
+        (SELECT x, x FROM point GROUP BY x),
+        (SELECT z FROM point WHERE y = :y AND x = :x)
+      );
+
+      CREATE TEMPORARY TABLE surface AS
+      SELECT xt.x, p.*
+      FROM (
+        SELECT row_number() OVER () rownum, *
+        FROM pivot
+      ) p
+      JOIN (
+        SELECT row_number() OVER () rownum, x
+        FROM point
+        GROUP BY x
+      ) xt USING(rownum);
+      ALTER TABLE surface DROP COLUMN rownum;
+      SELECT * FROM surface;
+    `)
+    expect(actual.columns).to.eql(['x', 'y', '5.0', '10.0', '15.0'])
+    expect(actual.values).to.eql([
+      [5, 3, 3.2, 4, 4.8],
+      [10, 6, 4.3, 3.8, 4],
+      [15, 9, 5.4, 3.6, 3.5]
+    ])
+  })
+
+  it('supports FTS5', async function () {
+    const actual = await db.execute(`
+      CREATE VIRTUAL TABLE email USING fts5(sender, title, body, tokenize = 'porter ascii');
+
+      INSERT INTO email VALUES
+        (
+          'foo@localhost',
+          'fts3/4',
+          'FTS3 and FTS4 are SQLite virtual table modules that allows users to perform '
+          || 'full-text searches on a set of documents.'
+        ),
+        (
+          'bar@localhost',
+          'fts4',
+          'FTS5 is an SQLite virtual table module that provides full-text search '
+          || 'functionality to database applications.'
+        );
+
+      SELECT sender
+      FROM email
+      WHERE body MATCH '"full-text" NOT document'
+      ORDER BY rank;
+    `)
+    expect(actual.values).to.eql([['bar@localhost']])
+  })
+})

vue.config.js

@@ -3,6 +3,9 @@ const WorkboxPlugin = require('workbox-webpack-plugin')
 
 module.exports = {
   publicPath: '',
+  // Workaround for https://github.com/vuejs/vue-cli/issues/5399 as described
+  // in https://stackoverflow.com/a/63185174
+  lintOnSave: process.env.NODE_ENV === 'development',
   configureWebpack: {
     plugins: [
       new CopyPlugin([