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Start work on CSS rule transformer
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Kovid Goyal
parent
b1664c7417
commit
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16
src/calibre/ebooks/css_transform_rules.py
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src/calibre/ebooks/css_transform_rules.py
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#!/usr/bin/env python2
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# vim:fileencoding=utf-8
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# License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
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from __future__ import (unicode_literals, division, absolute_import,
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print_function)
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import regex
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REGEX_FLAGS = regex.VERSION1 | regex.UNICODE
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def compile_pat(pat):
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return regex.compile(pat, flags=REGEX_FLAGS)
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def parse_length(raw):
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raise NotImplementedError('TODO: implement this')
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src/calibre/gui2/css_transform_rules.py
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src/calibre/gui2/css_transform_rules.py
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#!/usr/bin/env python2
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# vim:fileencoding=utf-8
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# License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
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from __future__ import (unicode_literals, division, absolute_import,
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print_function)
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from collections import OrderedDict
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from PyQt5.Qt import (
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QWidget, QVBoxLayout, QHBoxLayout, QLabel, QComboBox, QLineEdit, QListWidgetItem
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)
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from calibre.ebooks.css_transform_rules import compile_pat, parse_length
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from calibre.gui2 import error_dialog, elided_text
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from calibre.gui2.tag_mapper import RuleEditDialog as RuleEditDialogBase, Rules as RulesBase
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class RuleEdit(QWidget): # {{{
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ACTION_MAP = OrderedDict((
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('remove', _('Remove the property')),
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('append', _('Add extra properties')),
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('change', _('Change the value to')),
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('*', _('Multiply the value by')),
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('/', _('Divide the value by')),
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('+', _('Add to the value')),
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('-', _('Subtract from the value')),
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))
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MATCH_TYPE_MAP = OrderedDict((
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('==', _('is')),
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('<', _('is less than')),
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('>', _('is greater than')),
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('<=', _('is less than or equal to')),
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('>=', _('is greater than or equal to')),
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('matches', _('matches pattern')),
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('not_matches', _('does not match pattern'))
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))
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def __init__(self, parent=None):
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QWidget.__init__(self, parent)
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self.l = l = QVBoxLayout(self)
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self.h = h = QHBoxLayout()
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self.la = la = QLabel(self.MSG)
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la.setWordWrap(True)
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l.addWidget(la)
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l.addLayout(h)
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english_sentence = '{preamble} {property} {match_type} {query}'
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sentence = _('{preamble} {property} {match_type} {query}')
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if set(sentence.split()) != set(english_sentence.split()):
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sentence = english_sentence
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parts = sentence.split()
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for clause in parts:
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if clause == '{preamble}':
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self.preamble = w = QLabel(_('If the &property:'))
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elif clause == '{property}':
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self.property = w = QLineEdit(self)
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w.setToolTip(_('The name of a CSS property, for example: font-size\n'))
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elif clause == '{match_type}':
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self.match_type = w = QComboBox(self)
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for action, text in self.MATCH_TYPE_MAP.iteritems():
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w.addItem(text, action)
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elif clause == '{query}':
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self.query = w = QLineEdit(self)
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h.addWidget(w)
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if clause is not parts[-1]:
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h.addWidget(QLabel('\xa0'))
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self.h2 = h = QHBoxLayout()
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l.addLayout(h)
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english_sentence = '{action} {action_data}'
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sentence = _('{action} {action_data}')
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if set(sentence.split()) != set(english_sentence.split()):
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sentence = english_sentence
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parts = sentence.split()
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for clause in parts:
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if clause == '{action}':
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self.action = w = QComboBox(self)
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for action, text in self.ACTION_MAP.iteritems():
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w.addItem(text, action)
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elif clause == '{action_data}':
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self.action_data = w = QLineEdit(self)
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h.addWidget(w)
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if clause is not parts[-1]:
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h.addWidget(QLabel('\xa0'))
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self.update_state()
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def sizeHint(self):
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a = QWidget.sizeHint(self)
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a.setHeight(a.height() + 75)
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a.setWidth(a.width() + 100)
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return a
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def update_state(self):
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r = self.rule
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self.action_data.setVisible(r['action'] != 'remove')
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tt = _('The CSS property value')
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mt = r['match_type']
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if 'matches' in mt:
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tt = _('A regular expression')
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elif mt in '< > <= >='.split():
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tt = _('Either a CSS length, such as 10pt or a unit less number. If a unitless'
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' number is used it will compared with the CSS value using whatever unit'
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' the value has.')
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self.query.setToolTip(tt)
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tt = ''
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ac = r['action']
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if ac == 'append':
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tt = _('CSS properties for to add to the rule that contains the matching style. You'
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' can specify more than one property, separated by semi-colons, for example:'
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' color:red; font-weight: bold')
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elif ac in '+=*/':
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tt = _('A number')
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self.action_data.setToolTip(tt)
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@property
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def rule(self):
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return {
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'property':self.property.text().strip(),
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'match_type': self.match_type.currentData(),
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'query': self.query.text().strip(),
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'action': self.action.currentData(),
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'action_data': self.action_data.text().strip(),
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}
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@rule.setter
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def rule(self, rule):
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def sc(name):
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c = getattr(self, name)
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idx = c.findData(unicode(rule.get(name, '')))
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if idx < 0:
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idx = 0
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c.setCurrentIndex(idx)
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sc('action'), sc('match_type')
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self.query.setText(unicode(rule.get('query', '')).strip())
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self.action_data.setText(unicode(rule.get('action_data', '')).strip())
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def validate(self):
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rule = self.rule
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if not rule['query']:
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error_dialog(self, _('Query required'), _(
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'You must specify a value for the CSS property to match'), show=True)
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return False
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mt = rule['match_type']
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if 'matches' in mt:
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try:
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compile_pat(rule['query'])
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except Exception:
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error_dialog(self, _('Query invalid'), _(
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'%s is not a valid regular expression') % rule['query'], show=True)
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return False
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elif mt in '< > <= >='.split():
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try:
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parse_length(rule['query'])
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except Exception:
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error_dialog(self, _('Query invalid'), _(
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'%s is not a valid length or number') % rule['query'], show=True)
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return False
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ac, ad = rule['action'], rule['action_data']
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if not ad and ac != 'remove':
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msg = _('You must specify a number')
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if ac == 'append':
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msg = _('You must specify at least one CSS property to add')
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elif ac == 'change':
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msg = _('You must specify a value to change the property to')
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error_dialog(self, _('No data'), msg, show=True)
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return False
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if ac in '+-*/':
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try:
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float(ad)
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except Exception:
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error_dialog(self, _('Invalid number'), _('%s is not a number') % ad, show=True)
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return False
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return True
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# }}}
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class RuleEditDialog(RuleEditDialogBase): # {{{
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PREFS_NAME = 'edit-css-transform-rule'
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DIALOG_TITLE = _('Edit rule')
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RuleEditClass = RuleEdit
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# }}}
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class RuleItem(QListWidgetItem): # {{{
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@staticmethod
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def text_from_rule(rule, parent):
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query = elided_text(rule['query'], font=parent.font(), width=200, pos='right')
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text = _(
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'If the property <i>{property}</i> <b>{match_type}</b> <b>{query}</b><br>{action}').format(
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property=rule['property'], action=RuleEdit.ACTION_MAP[rule['action']],
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match_type=RuleEdit.MATCH_TYPE_MAP[rule['match_type']], query=query)
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if rule['action_data']:
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ad = elided_text(rule['action_data'], font=parent.font(), width=200, pos='right')
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text += ' <code>%s</code>' % ad
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return text
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# }}}
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class Rules(RulesBase):
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RuleItemClass = RuleItem
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RuleEditDialogClass = RuleEditDialog
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MSG = _('You can specify rules to transform styles here. Click the "Add Rule" button'
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' below to get started.')
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