15

考虑这个片段：

import sys
import textwrap
import re

from PyQt5.Qt import *  # noqa

from PyQt5.Qsci import QsciScintilla
from PyQt5.Qsci import QsciLexerCustom

from lark import Lark, inline_args, Transformer


class LexerJson(QsciLexerCustom):

    def __init__(self, parent=None):
        super().__init__(parent)
        self.create_grammar()
        self.create_styles()

    def create_styles(self):
        deeppink = QColor(249, 38, 114)
        khaki = QColor(230, 219, 116)
        mediumpurple = QColor(174, 129, 255)
        mediumturquoise = QColor(81, 217, 205)
        yellowgreen = QColor(166, 226, 46)
        lightcyan = QColor(213, 248, 232)
        darkslategrey = QColor(39, 40, 34)

        styles = {
            0: mediumturquoise,
            1: mediumpurple,
            2: yellowgreen,
            3: deeppink,
            4: khaki,
            5: lightcyan
        }

        for style, color in styles.items():
            self.setColor(color, style)
            self.setPaper(darkslategrey, style)
            self.setFont(self.parent().font(), style)

        self.token_styles = {
            "__COLON": 5,
            "__COMMA": 5,
            "__FALSE1": 0,
            "__LBRACE": 5,
            "__LSQB": 5,
            "__NULL2": 0,
            "__RBRACE": 5,
            "__RSQB": 5,
            "__TRUE0": 0,
            "ESCAPED_STRING": 4,
            "SIGNED_NUMBER": 1,
        }

    def create_grammar(self):
        grammar = '''
            ?start: value
            ?value: object
                  | array
                  | string
                  | SIGNED_NUMBER      -> number
                  | "true"             -> true
                  | "false"            -> false
                  | "null"             -> null
            array  : "[" [value ("," value)*] "]"
            object : "{" [pair ("," pair)*] "}"
            pair   : string ":" value
            string : ESCAPED_STRING
            %import common.ESCAPED_STRING
            %import common.SIGNED_NUMBER
            %import common.WS
            %ignore WS
        '''

        class TreeToJson(Transformer):
            @inline_args
            def string(self, s):
                return s[1:-1].replace('\\"', '"')

            array = list
            pair = tuple
            object = dict
            number = inline_args(float)

            def null(self, _): return None

            def true(self, _): return True

            def false(self, _): return False

        self.lark = Lark(grammar, parser='lalr', transformer=TreeToJson())
        # All tokens: print([t.name for t in self.lark.parser.lexer.tokens])

    def defaultPaper(self, style):
        return QColor(39, 40, 34)

    def language(self):
        return "Json"

    def description(self, style):
        return {v: k for k, v in self.token_styles.items()}.get(style, "")

    def styleText(self, start, end):
        self.startStyling(start)
        text = self.parent().text()[start:end]
        last_pos = 0

        try:
            for token in self.lark.lex(text):
                ws_len = token.pos_in_stream - last_pos
                if ws_len:
                    self.setStyling(ws_len, 0)    # whitespace

                token_len = len(bytearray(token, "utf-8"))
                self.setStyling(
                    token_len, self.token_styles.get(token.type, 0))

                last_pos = token.pos_in_stream + token_len
        except Exception as e:
            print(e)


class EditorAll(QsciScintilla):

    def __init__(self, parent=None):
        super().__init__(parent)

        # Set font defaults
        font = QFont()
        font.setFamily('Consolas')
        font.setFixedPitch(True)
        font.setPointSize(8)
        font.setBold(True)
        self.setFont(font)

        # Set margin defaults
        fontmetrics = QFontMetrics(font)
        self.setMarginsFont(font)
        self.setMarginWidth(0, fontmetrics.width("000") + 6)
        self.setMarginLineNumbers(0, True)
        self.setMarginsForegroundColor(QColor(128, 128, 128))
        self.setMarginsBackgroundColor(QColor(39, 40, 34))
        self.setMarginType(1, self.SymbolMargin)
        self.setMarginWidth(1, 12)

        # Set indentation defaults
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)
        self.setIndentationGuides(True)

        # Set folding defaults (http://www.scintilla.org/ScintillaDoc.html#Folding)
        self.setFolding(QsciScintilla.CircledFoldStyle)

        # Set caret defaults
        self.setCaretForegroundColor(QColor(247, 247, 241))
        self.setCaretWidth(2)

        # Set selection color defaults
        self.setSelectionBackgroundColor(QColor(61, 61, 52))
        self.resetSelectionForegroundColor()

        # Set multiselection defaults
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPLESELECTION, True)
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPASTE, 1)
        self.SendScintilla(
            QsciScintilla.SCI_SETADDITIONALSELECTIONTYPING, True)

        lexer = LexerJson(self)
        self.setLexer(lexer)


def main():
    app = QApplication(sys.argv)
    ex = EditorAll()
    ex.setWindowTitle(__file__)
    ex.setText(textwrap.dedent("""\
        {
            "_id": "5b05ffcbcf8e597939b3f5ca",
            "about": "Excepteur consequat commodo esse voluptate aute aliquip ad sint deserunt commodo eiusmod irure. Sint aliquip sit magna duis eu est culpa aliqua excepteur ut tempor nulla. Aliqua ex pariatur id labore sit. Quis sit ex aliqua veniam exercitation laboris anim adipisicing. Lorem nisi reprehenderit ullamco labore qui sit ut aliqua tempor consequat pariatur proident.",
            "address": "665 Malbone Street, Thornport, Louisiana, 243",
            "age": 23,
            "balance": "$3,216.91",
            "company": "BULLJUICE",
            "email": "elisekelley@bulljuice.com",
            "eyeColor": "brown",
            "gender": "female",
            "guid": "d3a6d865-0f64-4042-8a78-4f53de9b0707",
            "index": 0,
            "isActive": false,
            "isActive2": true,
            "latitude": -18.660714,
            "longitude": -85.378048,
            "name": "Elise Kelley",
            "phone": "+1 (808) 543-3966",
            "picture": "http://placehold.it/32x32",
            "registered": "2017-09-30T03:47:40 -02:00",
            "tags": [
                "et",
                "nostrud",
                "in",
                "fugiat",
                "incididunt",
                "labore",
                "nostrud"
            ]
        }\
    """))
    ex.resize(800, 600)
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

要运行上面的 mcve，你只需要运行pip install lark-parser PyQt5 QScintilla

我试图弄清楚如何修改LexerJson，以便符号[ ] { }支持折叠。当使用诸如qscilexercpp.cpp之类的现有类时，折叠行为是免费提供给您的，例如，您只需执行以下操作：

# http://www.scintilla.org/ScintillaDoc.html#Folding
self.setFolding(QsciScintilla.BoxedTreeFoldStyle)

lexer = QsciLexerCPP()
lexer.setFoldAtElse(True)
lexer.setFoldComments(True)
lexer.setFoldCompact(False)
lexer.setFoldPreprocessor(True)
self.setLexer(lexer)

折叠可以免费工作......但是当我在发布的 mcve 中使用自定义词法分析器时，我猜你必须自己实现该行为，不幸的是我不知道该怎么做。

所以，这基本上是一个问题，你如何在 QsciLexerCustom 子类上实现折叠？

4

1 回答 1

12

我无法修复你的词法分析器代码，但我可以给你一个相同的工作示例

import sys
from PyQt5.Qt import *
from PyQt5.Qsci import QsciScintilla, QsciLexerCPP
from PyQt5.Qsci import QsciLexerCustom

if sys.hexversion < 0x020600F0:
     print('python 2.6 or greater is required by this program')
     sys.exit(1)

_sample = """
# Sample config file

this is a junk line

[FirstItem]
Width=100
Height=200
Colour=orange
Info=this is some
     multiline
     text

[SecondItem]
Width=200
Height=300
Colour=green
Info=
     this is some
     multiline
     text
"""


class MainWindow(QMainWindow):
     def __init__(self):
         QMainWindow.__init__(self)
         self.setWindowTitle('Custom Lexer For Config Files')
         self.setGeometry(50, 200, 400, 400)
         self.editor = QsciScintilla(self)
         self.editor.setUtf8(True)
         self.editor.setMarginWidth(2, 15)
         self.editor.setFolding(True)
         self.setCentralWidget(self.editor)
         self.lexer = ConfigLexer(self.editor)
         self.editor.setLexer(self.lexer)
         self.editor.setText(_sample)


class ConfigLexer(QsciLexerCustom):
     def __init__(self, parent):
         QsciLexerCustom.__init__(self, parent)
         self._styles = {
             0: 'Default',
             1: 'Comment',
             2: 'Section',
             3: 'Key',
             4: 'Assignment',
             5: 'Value',
             }
         for key,value in self._styles.items():
             setattr(self, value, key)
         self._foldcompact = True

     def foldCompact(self):
         return self._foldcompact

     def setFoldCompact(self, enable):
         self._foldcompact = bool(enable)

     def language(self):
         return 'Config Files'

     def description(self, style):
         return self._styles.get(style, '')

     def defaultColor(self, style):
         if style == self.Default:
             return QColor('#000000')
         elif style == self.Comment:
             return QColor('#A0A0A0')
         elif style == self.Section:
             return QColor('#CC6600')
         elif style == self.Key:
             return QColor('#0000CC')
         elif style == self.Assignment:
             return QColor('#CC0000')
         elif style == self.Value:
             return QColor('#00CC00')
         return QsciLexerCustom.defaultColor(self, style)

     def defaultPaper(self, style):
         if style == self.Section:
             return QColor('#FFEECC')
         return QsciLexerCustom.defaultPaper(self, style)

     def defaultEolFill(self, style):
         if style == self.Section:
             return True
         return QsciLexerCustom.defaultEolFill(self, style)

     def defaultFont(self, style):
         if style == self.Comment:
             if sys.platform in ('win32', 'cygwin'):
                 return QFont('Comic Sans MS', 9)
             return QFont('Bitstream Vera Serif', 9)
         return QsciLexerCustom.defaultFont(self, style)

     def styleText(self, start, end):
         editor = self.editor()
         if editor is None:
             return

         SCI = editor.SendScintilla
         GETFOLDLEVEL = QsciScintilla.SCI_GETFOLDLEVEL
         SETFOLDLEVEL = QsciScintilla.SCI_SETFOLDLEVEL
         HEADERFLAG = QsciScintilla.SC_FOLDLEVELHEADERFLAG
         LEVELBASE = QsciScintilla.SC_FOLDLEVELBASE
         NUMBERMASK = QsciScintilla.SC_FOLDLEVELNUMBERMASK
         WHITEFLAG = QsciScintilla.SC_FOLDLEVELWHITEFLAG
         set_style = self.setStyling

         source = ''
         if end > editor.length():
             end = editor.length()
         if end > start:
             source = bytearray(end - start)
             SCI(QsciScintilla.SCI_GETTEXTRANGE, start, end, source)
         if not source:
             return

         compact = self.foldCompact()

         index = SCI(QsciScintilla.SCI_LINEFROMPOSITION, start)
         if index > 0:
             pos = SCI(QsciScintilla.SCI_GETLINEENDPOSITION, index - 1)
             state = SCI(QsciScintilla.SCI_GETSTYLEAT, pos)
         else:
             state = self.Default

         self.startStyling(start, 0x1f)

         for line in source.splitlines(True):
             length = len(line)
             if length == 1:
                 whitespace = compact
                 state = self.Default
             else:
                 whitespace = False
                 firstchar = chr(line[0])
                 if firstchar in '#;':
                     state = self.Comment
                 elif firstchar == '[':
                     state = self.Section
                 elif firstchar in ' \t':
                     if state == self.Value or state == self.Assignment:
                         state = self.Value
                     else:
                         whitespace = compact and line.isspace()
                         state = self.Default
                 else:
                     pos = line.find(b'=')
                     if pos < 0:
                         pos = line.find(b':')
                     else:
                         tmp = line.find(b':', 0, pos)
                         if tmp >= 0:
                             pos = tmp
                     if pos > 0:
                         set_style(pos, self.Key)
                         set_style(1, self.Assignment)
                         length = length - pos - 1
                         state = self.Value
                     else:
                         state = self.Default
             set_style(length, state)

             if state == self.Section:
                 level = LEVELBASE | HEADERFLAG
             elif index > 0:
                 lastlevel = SCI(GETFOLDLEVEL, index - 1)
                 if lastlevel & HEADERFLAG:
                     level = LEVELBASE + 1
                 else:
                     level = lastlevel & NUMBERMASK
             else:
                 level = LEVELBASE

             if whitespace:
                 level |= WHITEFLAG
             if level != SCI(GETFOLDLEVEL, index):
                 SCI(SETFOLDLEVEL, index, level)

             index += 1

         if index > 0:
             lastlevel = SCI(GETFOLDLEVEL, index - 1)
             if lastlevel & HEADERFLAG:
                 level = LEVELBASE + 1
             else:
                 level = lastlevel & NUMBERMASK
         else:
             level = LEVELBASE

         lastlevel = SCI(GETFOLDLEVEL, index)
         SCI(SETFOLDLEVEL, index, level | lastlevel & ~NUMBERMASK)


if __name__ == "__main__":
     app = QApplication(sys.argv)
     win = MainWindow()
     win.show()
     sys.exit(app.exec_())

关键的事情发生在这里

             if state == self.Section:
                 level = LEVELBASE | HEADERFLAG
             elif index > 0:
                 lastlevel = SCI(GETFOLDLEVEL, index - 1)
                 if lastlevel & HEADERFLAG:
                     level = LEVELBASE + 1
                 else:
                     level = lastlevel & NUMBERMASK
             else:
                 level = LEVELBASE

             if whitespace:
                 level |= WHITEFLAG
             if level != SCI(GETFOLDLEVEL, index):
                 SCI(SETFOLDLEVEL, index, level)

             index += 1

         if index > 0:
             lastlevel = SCI(GETFOLDLEVEL, index - 1)
             if lastlevel & HEADERFLAG:
                 level = LEVELBASE + 1
             else:
                 level = lastlevel & NUMBERMASK
         else:
             level = LEVELBASE

         lastlevel = SCI(GETFOLDLEVEL, index)
         SCI(SETFOLDLEVEL, index, level | lastlevel & ~NUMBERMASK)

工作展示

PS：感谢https://github.com/pingf/toys/blob/f808e7c4ed1a76db4800c8e1ee6d163242df52cc/src/201403/customLexer2.py

于 2018-06-06T11:01:02.563 回答