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# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtGui, QtCore
class LineNumberArea(QtGui.QWidget):
def __init__(self,editor):
self.codeEditor=editor
QtGui.QWidget.__init__(self, editor)
def sizeHint(self):
return QtCore.QSize(self.codeEditor.lineNumberAreaWidth(),0)
def paintEvent(self, event):
self.codeEditor.lineNumberAreaPaintEvent(event)
class CodeEditor(QtGui.QPlainTextEdit):
def __init__(self,parent=None):
QtGui.QPlainTextEdit.__init__(self,parent)
self.lineNumberArea = LineNumberArea (self)
self.connect(self, QtCore.SIGNAL("blockCountChanged(int)"),
self.updateLineNumberAreaWidth)
self.connect(self, QtCore.SIGNAL("updateRequest(const QRect &, int)"),
self.updateLineNumberArea)
self.connect(self, QtCore.SIGNAL("cursorPositionChanged()"),
self.highlightCurrentLine)
self.updateLineNumberAreaWidth(0)
self.errorPos=None
self.highlightCurrentLine()
def lineNumberAreaPaintEvent(self, event):
painter=QtGui.QPainter(self.lineNumberArea)
painter.fillRect(event.rect(), QtCore.Qt.lightGray)
block = self.firstVisibleBlock()
blockNumber = block.blockNumber();
top = int(self.blockBoundingGeometry(block).translated(self.contentOffset()).top())
bottom = top + int(self.blockBoundingRect(block).height())
while block.isValid() and top <= event.rect().bottom():
if block.isVisible() and bottom >= event.rect().top():
number = str(blockNumber + 1)
painter.setPen(QtCore.Qt.black)
painter.drawText(0, top, self.lineNumberArea.width(),
self.fontMetrics().height(),
QtCore.Qt.AlignRight, number)
block = block.next()
top = bottom
bottom = top + int(self.blockBoundingRect(block).height())
blockNumber+=1
def lineNumberAreaWidth(self):
digits = 1
_max = max (1, self.blockCount())
while (_max >= 10):
_max = _max/10
digits+=1
space = 5 + self.fontMetrics().width('9') * digits
return space
def updateLineNumberAreaWidth(self, newBlockCount):
self.setViewportMargins(self.lineNumberAreaWidth(), 0, 0, 0)
def updateLineNumberArea(self, rect, dy):
if dy:
self.lineNumberArea.scroll(0, dy);
else:
self.lineNumberArea.update(0, rect.y(),
self.lineNumberArea.width(), rect.height())
if rect.contains(self.viewport().rect()):
self.updateLineNumberAreaWidth(0)
def resizeEvent(self, e):
QtGui.QPlainTextEdit.resizeEvent(self,e)
self.cr = self.contentsRect()
self.lineNumberArea.setGeometry(self.cr.left(),
self.cr.top(),
self.lineNumberAreaWidth(),
self.cr.height())
def highlightError(self,pos):
self.errorPos=pos
self.highlightCurrentLine()
def highlightCurrentLine(self):
extraSelections=[]
if not self.isReadOnly():
selection = QtGui.QTextEdit.ExtraSelection()
lineColor = QtGui.QColor(QtCore.Qt.yellow).lighter(160)
selection.format.setBackground(lineColor)
selection.format.setProperty(QtGui.QTextFormat.FullWidthSelection, True)
selection.cursor = self.textCursor()
selection.cursor.clearSelection()
extraSelections.append(selection)
if self.errorPos is not None:
errorSel = QtGui.QTextEdit.ExtraSelection()
lineColor = QtGui.QColor(QtCore.Qt.red).lighter(160)
errorSel.format.setBackground(lineColor)
errorSel.format.setProperty(QtGui.QTextFormat.FullWidthSelection, True)
errorSel.cursor = QtGui.QTextCursor(self.document())
errorSel.cursor.setPosition(self.errorPos)
errorSel.cursor.clearSelection()
extraSelections.append(errorSel)
self.setExtraSelections(extraSelections)
if __name__ == "__main__":
try:
import json
except ImportError:
import simplejson as json
from highlighter import Highlighter
app = QtGui.QApplication(sys.argv)
js = CodeEditor()
js.setWindowTitle('javascript')
hl=Highlighter(js.document(),"javascript")
js.show()
def validateJSON():
style=unicode(js.toPlainText())
if not style.strip(): #no point in validating an empty string
return
pos=None
try:
json.loads(style)
except ValueError, e:
s=str(e)
print s
if s == 'No JSON object could be decoded':
pos=0
elif s.startswith('Expecting '):
pos=int(s.split(' ')[-1][:-1])
elif s.startswith('Extra data'):
pos=int(s.split(' ')[-3])
else:
print 'UNKNOWN ERROR'
# This makes a red bar appear in the line
# containing position pos
js.highlightError(pos)
# Run validateJSON on every keypress
js.connect(js,QtCore.SIGNAL('textChanged()'),validateJSON)
sys.exit(app.exec_())
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