#Copyright ReportLab Europe Ltd. 2000-2004

#see license.txt for license details

#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/lib/codecharts.py

#$Header $

__version__=''' $Id '''

__doc__="""Routines to print code page (character set) drawings.

To be sure we can accurately represent characters in various encodings

and fonts, we need some routines to display all those characters.

These are defined herein.  The idea is to include flowable, drawable

and graphic objects for single and multi-byte fonts. """

import string

from reportlab.pdfgen.canvas import Canvas

from reportlab.platypus import Flowable

from reportlab.pdfbase import pdfmetrics, cidfonts

from reportlab.graphics.shapes import Drawing, Group, String, Circle, Rect

from reportlab.graphics.widgetbase import Widget

from reportlab.lib import colors

class CodeChartBase(Flowable):

    """Basic bits of drawing furniture used by

    single and multi-byte versions: ability to put letters

    into boxes."""

    def calcLayout(self):

        "Work out x and y positions for drawing"

        rows = self.codePoints * 1.0 / self.charsPerRow

        if rows == int(rows):

            self.rows = int(rows)

        else:

            self.rows = int(rows) + 1

        # size allows for a gray column of labels

        self.width = self.boxSize * (1+self.charsPerRow)

        self.height = self.boxSize * (1+self.rows)

        #handy lists

        self.ylist = []

        for row in range(self.rows + 2):

            self.ylist.append(row * self.boxSize)

        self.xlist = []

        for col in range(self.charsPerRow + 2):

            self.xlist.append(col * self.boxSize)

    def formatByte(self, byt):

        if self.hex:

            return '%02X' % byt

        else:

            return '%d' % byt

    def drawChars(self, charList):

        """Fills boxes in order.  None means skip a box.

        Empty boxes at end get filled with gray"""

        extraNeeded = (self.rows * self.charsPerRow - len(charList))

        for i in range(extraNeeded):

            charList.append(None)

        #charList.extend([None] * extraNeeded)

        row = 0

        col = 0

        self.canv.setFont(self.fontName, self.boxSize * 0.75)

        for ch in charList:  # may be 2 bytes or 1

            if ch is None:

                self.canv.setFillGray(0.9)

                self.canv.rect((1+col) * self.boxSize, (self.rows - row - 1) * self.boxSize,

                    self.boxSize, self.boxSize, stroke=0, fill=1)

                self.canv.setFillGray(0.0)

            else:

                try:

                    self.canv.drawCentredString(

                            (col+1.5) * self.boxSize,

                            (self.rows - row - 0.875) * self.boxSize,

                            ch,

                            )

                except:

                    self.canv.setFillGray(0.9)

                    self.canv.rect((1+col) * self.boxSize, (self.rows - row - 1) * self.boxSize,

                        self.boxSize, self.boxSize, stroke=0, fill=1)

                    self.canv.drawCentredString(

                            (col+1.5) * self.boxSize,

                            (self.rows - row - 0.875) * self.boxSize,

                            '?',

                            )

                    self.canv.setFillGray(0.0)

            col = col + 1

            if col == self.charsPerRow:

                row = row + 1

                col = 0

    def drawLabels(self, topLeft = ''):

        """Writes little labels in the top row and first column"""

        self.canv.setFillGray(0.8)

        self.canv.rect(0, self.ylist[-2], self.width, self.boxSize, fill=1, stroke=0)

        self.canv.rect(0, 0, self.boxSize, self.ylist[-2], fill=1, stroke=0)

        self.canv.setFillGray(0.0)

        #label each row and column

        self.canv.setFont('Helvetica-Oblique',0.375 * self.boxSize)

        byt = 0

        for row in range(self.rows):

            if self.rowLabels:

                label = self.rowLabels[row]

            else: # format start bytes as hex or decimal

                label = self.formatByte(row * self.charsPerRow)

            self.canv.drawCentredString(0.5 * self.boxSize,

                                        (self.rows - row - 0.75) * self.boxSize,

                                        label

                                        )

        for col in range(self.charsPerRow):

            self.canv.drawCentredString((col + 1.5) * self.boxSize,

                                        (self.rows + 0.25) * self.boxSize,

                                        self.formatByte(col)

                                        )

        if topLeft:

            self.canv.setFont('Helvetica-BoldOblique',0.5 * self.boxSize)

            self.canv.drawCentredString(0.5 * self.boxSize,

                                        (self.rows + 0.25) * self.boxSize,

                                        topLeft

                                        )

class SingleByteEncodingChart(CodeChartBase):

    def __init__(self, faceName='Helvetica', encodingName='WinAnsiEncoding',

                 charsPerRow=16, boxSize=14, hex=1):

        self.codePoints = 256

        self.faceName = faceName

        self.encodingName = encodingName

        self.fontName = self.faceName + '-' + self.encodingName

        self.charsPerRow = charsPerRow

        self.boxSize = boxSize

        self.hex = hex

        self.rowLabels = None

        pdfmetrics.registerFont(pdfmetrics.Font(self.fontName,

                                                self.faceName,

                                                self.encodingName)

                                )

        self.calcLayout()

    def draw(self):

        self.drawLabels()

        charList = [None] * 32 + map(chr, range(32, 256))

        self.drawChars(charList)

        self.canv.grid(self.xlist, self.ylist)

class KutenRowCodeChart(CodeChartBase):

    """Formats one 'row' of the 94x94 space used in many Asian encodings.aliases

    These deliberately resemble the code charts in Ken Lunde's "Understanding

    CJKV Information Processing", to enable manual checking.  Due to the large

    numbers of characters, we don't try to make one graphic with 10,000 characters,

    but rather output a sequence of these."""

    #would be cleaner if both shared one base class whose job

    #was to draw the boxes, but never mind...

    def __init__(self, row, faceName, encodingName):

        self.row = row

        self.codePoints = 94

        self.boxSize = 18

        self.charsPerRow = 20

        self.rows = 5

        self.rowLabels = ['00','20','40','60','80']

        self.hex = 0

        self.faceName = faceName

        self.encodingName = encodingName

        try:

            # the dependent files might not be available

            font = cidfonts.CIDFont(self.faceName, self.encodingName)

            pdfmetrics.registerFont(font)

        except:

            # fall back to English and at least shwo we can draw the boxes

            self.faceName = 'Helvetica'

            self.encodingName = 'WinAnsiEncoding'

        self.fontName = self.faceName + '-' + self.encodingName

        self.calcLayout()

    def makeRow(self, row):

        """Works out the character values for this kuten row"""

        cells = []

        if string.find(self.encodingName, 'EUC') > -1:

            # it is an EUC family encoding.

            for col in range(1, 95):

                ch = chr(row + 160) + chr(col+160)

                cells.append(ch)

##        elif string.find(self.encodingName, 'GB') > -1:

##            # it is an EUC family encoding.

##            for col in range(1, 95):

##                ch = chr(row + 160) + chr(col+160)

        else:

            cells.append([None] * 94)

        return cells

    def draw(self):

        self.drawLabels(topLeft= 'R%d' % self.row)

        # work out which characters we need for the row

        #assert string.find(self.encodingName, 'EUC') > -1, 'Only handles EUC encoding today, you gave me %s!' % self.encodingName

        # pad out by 1 to match Ken Lunde's tables

        charList = [None] + self.makeRow(self.row)

        self.drawChars(charList)

        self.canv.grid(self.xlist, self.ylist)

class Big5CodeChart(CodeChartBase):

    """Formats one 'row' of the 94x160 space used in Big 5

    These deliberately resemble the code charts in Ken Lunde's "Understanding

    CJKV Information Processing", to enable manual checking."""

    def __init__(self, row, faceName, encodingName):

        self.row = row

        self.codePoints = 160

        self.boxSize = 18

        self.charsPerRow = 16

        self.rows = 10

        self.hex = 1

        self.faceName = faceName

        self.encodingName = encodingName

        self.rowLabels = ['4','5','6','7','A','B','C','D','E','F']

        try:

            # the dependent files might not be available

            font = cidfonts.CIDFont(self.faceName, self.encodingName)

            pdfmetrics.registerFont(font)

        except:

            # fall back to English and at least shwo we can draw the boxes

            self.faceName = 'Helvetica'

            self.encodingName = 'WinAnsiEncoding'

        self.fontName = self.faceName + '-' + self.encodingName

        self.calcLayout()

    def makeRow(self, row):

        """Works out the character values for this Big5 row.

        Rows start at 0xA1"""

        cells = []

        if string.find(self.encodingName, 'B5') > -1:

            # big 5, different row size

            for y in [4,5,6,7,10,11,12,13,14,15]:

                for x in range(16):

                    col = y*16+x

                    ch = chr(row) + chr(col)

                    cells.append(ch)

        else:

            cells.append([None] * 160)

        return cells

    def draw(self):

        self.drawLabels(topLeft='%02X' % self.row)

        charList = self.makeRow(self.row)

        self.drawChars(charList)

        self.canv.grid(self.xlist, self.ylist)

def hBoxText(msg, canvas, x, y, faceName, encName):

    """Helper for stringwidth tests on Asian fonts.

    Registers font if needed.  Then draws the string,

    and a box around it derived from the stringWidth function"""

    canvas.saveState()

    fontName = faceName + '-' + encName

    try:

        font = pdfmetrics.getFont(fontName)

    except KeyError:

        font = cidfonts.CIDFont(faceName, encName)

        pdfmetrics.registerFont(font)

    canvas.setFillGray(0.8)

    canvas.rect(x,y,pdfmetrics.stringWidth(msg, fontName, 16),16,stroke=0,fill=1)

    canvas.setFillGray(0)

    canvas.setFont(fontName, 16,16)

    canvas.drawString(x,y,msg)

    canvas.restoreState()

class CodeWidget(Widget):

    """Block showing all the characters"""

    def __init__(self):

        self.x = 0

        self.y = 0

        self.width = 160

        self.height = 160

    def draw(self):

        dx = self.width / 16.0

        dy = self.height / 16.0

        g = Group()

        g.add(Rect(self.x, self.y, self.width, self.height,

                   fillColor=None, strokeColor=colors.black))

        for x in range(16):

            for y in range(16):

                charValue = y * 16 + x

                if charValue > 32:

                    s = String(self.x + x * dx,

                               self.y + (self.height - y*dy), chr(charValue))

                    g.add(s)

        return g

def test():

    c = Canvas('codecharts.pdf')

    c.setFont('Helvetica-Bold', 24)

    c.drawString(72, 750, 'Testing code page charts')

    cc1 = SingleByteEncodingChart()

    cc1.drawOn(c, 72, 500)

    cc2 = SingleByteEncodingChart(charsPerRow=32)

    cc2.drawOn(c, 72, 300)

    cc3 = SingleByteEncodingChart(charsPerRow=25, hex=0)

    cc3.drawOn(c, 72, 100)

##    c.showPage()

##

##    c.setFont('Helvetica-Bold', 24)

##    c.drawString(72, 750, 'Multi-byte Kuten code chart examples')

##    KutenRowCodeChart(1, 'HeiseiMin-W3','EUC-H').drawOn(c, 72, 600)

##    KutenRowCodeChart(16, 'HeiseiMin-W3','EUC-H').drawOn(c, 72, 450)

##    KutenRowCodeChart(84, 'HeiseiMin-W3','EUC-H').drawOn(c, 72, 300)

##

##    c.showPage()

##    c.setFont('Helvetica-Bold', 24)

##    c.drawString(72, 750, 'Big5 Code Chart Examples')

##    #Big5CodeChart(0xA1, 'MSungStd-Light-Acro','ETenms-B5-H').drawOn(c, 72, 500)

    c.save()

    print 'saved codecharts.pdf'

if __name__=='__main__':

    test()