underscore_templates.py

from __future__ import print_function

import time
import os
import re
import glob
import json
import atexit
import traceback
import io

from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler

__all__ = ['compile_template']

__author__ = "Miguel Martinez Lopez"
__version__ = "1.0"

# https://github.com/superRaytin/underscore.template
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c.source="function("+f+"){\n"+i+"}",c},m.chain=function(n){var t=m(n);return t._chain=!0,t};var P=function(n,t){return n._chain?m(t).chain():t};m.mixin=function(n){m.each(m.functions(n),function(t){var r=m[t]=n[t];m.prototype[t]=function(){var n=[this._wrapped];return f.apply(n,arguments),P(this,r.apply(m,n))}})},m.mixin(m),m.each(["pop","push","reverse","shift","sort","splice","unshift"],function(n){var t=o[n];m.prototype[n]=function(){var r=this._wrapped;return t.apply(r,arguments),"shift"!==n&&"splice"!==n||0!==r.length||delete r[0],P(this,r)}}),m.each(["concat","join","slice"],function(n){var t=o[n];m.prototype[n]=function(){return P(this,t.apply(this._wrapped,arguments))}}),m.prototype.value=function(){return this._wrapped},m.prototype.valueOf=m.prototype.toJSON=m.prototype.value,m.prototype.toString=function(){return""+this._wrapped},"function"==typeof define&&define.amd&&define("underscore",[],function(){return m})}).call(this);"""
TEMPLATE_EXTENSION = "tmpl"

EVALUATE_PATTERN = r"<%([\s\S]+?)%>"
INTERPOLATE_PATTERN = r"<%=([\s\S]+?)%>"
ESCAPE_PATTERN = r"<%-([\s\S]+?)%>"

VARIABLE_NAME = None

# When customizing `templateSettings`, if you don't want to define an
# interpolation, evaluation or escaping regex, we need one that is
# guaranteed not to match.
_no_match = r"(.)^"

# Certain characters need to be escaped so that they can be put into a
# string literal.
_escapes = {
  "'":      "'",
  '\\':     '\\',
  '\r':     'r',
  '\n':     'n',
  '\t':     't',
  '\u2028': 'u2028',
  '\u2029': 'u2029'
}

# Regexes containing the keys and values listed immediately above.
_escaper_re = re.compile(r"\\|'|\r|\n|\t|\u2028|\u2029", re.UNICODE)

def _escape_chars(matchobj):
    a = matchobj.group(0)
    return '\\' + _escapes[a]


# Underscore template compiler
def compile_template(
    text,
    variable=VARIABLE_NAME,
    evaluate_pattern= EVALUATE_PATTERN,
    interpolate_pattern=INTERPOLATE_PATTERN,
    escape_pattern=ESCAPE_PATTERN):

    if evaluate_pattern is None:
        evaluate_pattern = _no_match

    if interpolate_pattern is None:
        interpolate_pattern = _no_match

    if escape_pattern is None:
        escape_pattern = _no_match

    index = 0
    source = "__p+='"

    # Combine delimiters into one regular expression via alternation.
    matcher = re.compile(r"{escape_pattern}|{interpolate_pattern}|{evaluate_pattern}|$".format(
                escape_pattern=escape_pattern,
                interpolate_pattern=interpolate_pattern,
                evaluate_pattern=evaluate_pattern
                ))

    # Compile the template source, escaping string literals appropriately.
    for matchobj in re.finditer(matcher, text):
        escape, interpolate, evaluate = matchobj.groups()

        match_start, match_end = matchobj.span(0)
        match_length = match_end - match_start

        html = text[index: match_start]

        escaped_html = re.sub(_escaper_re, _escape_chars, html)
        source += escaped_html

        index = match_end

        if escape:
            source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'"

        if interpolate:
            source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'"

        if evaluate:
            source += "';\n" + evaluate + "\n__p+='";

    source += "';\n"

    # If a variable is not specified, place data values in local scope.
    if variable is None:
        source = 'with(obj||{}){\n' + source + '}\n'

    source = "var __t,__p='',__j=Array.prototype.join," \
            + "print=function(){__p+=__j.call(arguments,'');};\n" \
            + source + 'return __p;\n'

    # Provide the compiled function source as a convenience for precompilation.
    argument_name = variable if variable else 'obj'
    source = 'function(' + argument_name + '){\n' + source + '}';

    return source

def compile_template_in_browser(text, driver, underscore_js=None):
    if not hasattr(driver, "_underscore_js"):
        if underscore_js is None:
            underscore_js = UNDERSCORE_JS

        driver.execute_script(underscore_js)
        driver._underscore_js = True

    js = "var template = " + json.dumps(tmpl) +"; return _.template(template).source";
    source = driver.execute_script(js)

    return source

# Taken from here:
#     https://github.com/juancarlospaco/css-html-js-minify/blob/master/css_html_js_minify/html_minifier.py
def remove_whitespaces_of_html(html):
    """Condense HTML, but be safe first if it have textareas or pre tags.
    >>> condense_html_whitespace('<i>  <b>    <a> test </a>    </b> </i><br>')
    '<i><b><a> test </a></b></i><br>'
    """  # first space between tags, then empty new lines and in-between.

    html = html.strip()

    tagsStack = []
    split = re.split('(<\\s*pre.*>|<\\s*/\\s*pre\\s*>|<\\s*textarea.*>|<\\s*/\\s*textarea\\s*>)', html, flags=re.IGNORECASE)
    for i in range(0, len(split)):
    	#if we are on a tag
        if (i + 1) % 2 == 0:
            tag = rawtag(split[i])
            if tag.startswith('/'):
                if not tagsStack or '/' + tagsStack.pop() != tag:
                    raise Exception("Some tag is not closed properly")
            else:
                tagsStack.append(tag)
            continue

		#else check if we are outside any nested <pre>/<textarea> tag
        if not tagsStack:
            temp = re.sub(r'>\s+<', '><', split[i])
            split[i] = re.sub(r'\s{2,}|[\r\n]', ' ', temp)
    return ''.join(split)


def rawtag(str):
    if re.match('<\\s*pre.*>', str, flags=re.IGNORECASE):
        return 'pre'
    if re.match('<\\s*textarea.*>', str, flags=re.IGNORECASE):
        return 'txt'
    if re.match('<\\s*/\\s*pre\\s*>', str, flags=re.IGNORECASE):
        return '/pre'
    if re.match('<\\s*/\\s*textarea\\s*>', str, flags=re.IGNORECASE):
        return '/txt'



class Underscore_Compiler(object):
    def __init__(self,
        path_to_underscorejs=False,
        browser_name=None,
        requirejs=False,
        remove_whitespaces=True,
        evaluate_pattern=EVALUATE_PATTERN,
        interpolate_pattern=INTERPOLATE_PATTERN,
        escape_pattern=ESCAPE_PATTERN):

        if browser_name is None:
            _compile_template = lambda template: compile_template(
                                                                template,
                                                                evaluate_pattern=evaluate_pattern,
                                                                interpolate_pattern=interpolate_pattern,
                                                                escape_pattern=escape_pattern)
        else:
            from selenium import webdriver

            if browser_name == "chrome":
                driver = webdriver.Chrome()
            elif browser_name == "firefox":
                driver = webdriver.Firefox()
            elif browser_name == "phantomjs":
                driver = webdriver.PhantomJS()
            else:
                raise Exception("Invalid browser: %s"%browser_name)

            if path_to_underscorejs is None:
                underscore_js = None
            else:
                with io.open(path_to_underscorejs, 'r', encoding='utf8') as f:
                    underscore_js = f.read()
            if evaluate_pattern != EVALUATE_PATTERN:
                underscore_js += "\n_.templateSettings.evaluate=/"+evaluate_pattern+"/g"

            if interpolate_pattern != INTERPOLATE_PATTERN:
                underscore_js += "\n_.templateSettings.interpolate=/"+interpolate_pattern+"/g"

            if escape_pattern != ESCAPE_PATTERN:
                underscore_js += "\n_.templateSettings.escape=/"+escape_pattern+"/g"

            def _compile_template(tmpl):
                compiled_template = compile_template_in_browser(tmpl, driver, underscore_js=underscore_js)

                return compiled_template

            atexit.register(driver.quit)

        self._remove_whitespaces = remove_whitespaces
        self._requirejs = requirejs

        self._compile_template = _compile_template

    def compile_templates(self, list_of_templates, remove_whitespaces=None, requirejs=None):
        if requirejs is None:
            requirejs = self._requirejs

        if remove_whitespaces is None:
            remove_whitespaces = self._remove_whitespaces

        js = "var templates = {};"

        for template_name, template in list_of_templates:
            if remove_whitespaces:
                template = remove_whitespaces_of_html(template)

            try:
                compiled_template = self._compile_template(template)
            except:
                traceback.print_exc()
                continue

            js += "\n"
            js += 'templates["%s"] = %s'%(template_name, compiled_template)

        if requirejs:
            js = "define('templates', function() {\n" +js + "\nreturn templates\n})"

        return js

    def compile_template_from_files(self, list_of_templates_paths, remove_whitespaces=None, requirejs=None):
        def template_generator():
            for template_path in list_of_templates_paths:
                print("compiling "+template_path+"...")

                with io.open(template_path, 'r', encoding='utf8') as f:
                    template = f.read()

                template_name = os.path.splitext(os.path.basename(template_path))[0]

                yield template_name, template

        return self.compile_templates(template_generator(), remove_whitespaces=remove_whitespaces, requirejs=requirejs)

    def compile_templates_in_dir(self,template_directory, output=None, remove_whitespaces=None, requirejs=None, template_extension=TEMPLATE_EXTENSION):
        list_of_templates_paths = glob.glob(os.path.join(template_directory, "*."+template_extension))

        js = self.compile_template_from_files(list_of_templates_paths, remove_whitespaces=remove_whitespaces, requirejs=requirejs)

        if output is not None:
            with io.open(output,'w',encoding='utf8') as f:
                f.write(js)

        return js

class Handler(PatternMatchingEventHandler):
    def __init__(self, compile_function, template_extension=TEMPLATE_EXTENSION):
        self._compile_function = compile_function

        super(Handler, self).__init__(patterns=["*."+template_extension], ignore_directories=True)

    def on_any_event(self, event):
        self._compile_function()

def run_observer(
        template_directory,
        output,
        requirejs=False,
        remove_whitespaces=False,
        browser_name=None,
        path_to_underscorejs=False,
        template_extension=TEMPLATE_EXTENSION,
        evaluate_pattern=EVALUATE_PATTERN,
        interpolate_pattern=INTERPOLATE_PATTERN,
        escape_pattern=ESCAPE_PATTERN):

    observer = Observer()

    underscore_compiler = Underscore_Compiler(
        path_to_underscorejs=path_to_underscorejs,
        browser_name=browser_name,
        requirejs=requirejs,
        evaluate_pattern=evaluate_pattern,
        escape_pattern=escape_pattern,
        interpolate_pattern=interpolate_pattern)

    def compile_all():
        underscore_compiler.compile_templates_in_dir(
            template_directory,
            output=output,
            template_extension=template_extension)

    compile_all()

    event_handler = Handler(
                            compile_all,
                            template_extension=template_extension)

    observer.schedule(event_handler, template_directory, recursive=False)
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()

    observer.join()

if __name__ == '__main__':
    import argparse
    parser = argparse.ArgumentParser(description="Compile all underscore templates in a directory")
    parser.add_argument("template_dir", default=os.getcwd(), help="Template directory")
    parser.add_argument("-o", "--output", default="templates.js", help="Path to javascript file for writing the compiled templates.")
    parser.add_argument("--remove-whitespaces", action="store_true", default=False, help="Condense whitespaces")
    parser.add_argument("--requirejs", action="store_true", default=False, help="Template should be requirejs compliant")
    parser.add_argument("--path-to-underscorejs", default=False, help="Path to underscore.js library")
    parser.add_argument("--template-extension", default=TEMPLATE_EXTENSION, help="Extension file of templates")
    parser.add_argument("--browser", "-b", default=None, help="Browser name")
    parser.add_argument("--evaluate-pattern", default=EVALUATE_PATTERN, help="Evaluate pattern")
    parser.add_argument("--escape-pattern", default=ESCAPE_PATTERN, help="Escape pattern")
    parser.add_argument("--interpolate-pattern", default=INTERPOLATE_PATTERN, help="Interpolate pattern")

    args = parser.parse_args()

    template_directory = args.template_dir
    path_to_underscorejs = args.path_to_underscorejs
    requirejs = args.requirejs
    output = args.output
    remove_whitespaces = args.remove_whitespaces
    template_extension = args.template_extension
    browser_name = args.browser
    evaluate_pattern = args.evaluate_pattern
    escape_pattern = args.escape_pattern
    interpolate_pattern = args.interpolate_pattern

    if browser_name is not None:
        browser_name = browser_name.lower()

    run_observer(
        template_directory,
        output,
        remove_whitespaces=remove_whitespaces,
        requirejs=requirejs,
        path_to_underscorejs=path_to_underscorejs,
        browser_name=browser_name,
        template_extension=template_extension,
        evaluate_pattern=evaluate_pattern,
        escape_pattern=escape_pattern,
        interpolate_pattern=interpolate_pattern)