#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/docs/userguide/ch5_paragraphs.py

from reportlab.tools.docco.rl_doc_utils import *

#begin chapter oon paragraphs

heading1("Paragraphs")

disc("""

The $reportlab.platypus.Paragraph$ class is one of the most useful of the Platypus $Flowables$;

it can format fairly arbitrary text and provides for inline font style and colour changes using

an XML style markup. The overall shape of the formatted text can be justified, right or left ragged

or centered. The XML markup can even be used to insert greek characters or to do subscripts.

""")

disc("""The following text creates an instance of the $Paragraph$ class:""")

eg("""Paragraph(text, style, bulletText=None)""")

disc("""The $text$ argument contains the text of the

paragraph; excess white space is removed from the text at the ends and internally after

linefeeds. This allows easy use of indented triple quoted text in <b>Python</b> scripts.

The $bulletText$ argument provides the text of a default bullet for the paragraph.

The font and other properties for the paragraph text and bullet are set using the style argument.

""")

disc("""

The $style$ argument should be an instance of class $ParagraphStyle$ obtained typically

using""")

eg("""

from reportlab.lib.styles import ParagraphStyle

""")

disc("""

this container class provides for the setting of multiple default paragraph attributes

in a structured way. The styles are arranged in a dictionary style object called a $stylesheet$

which allows for the styles to be accessed as $stylesheet['BodyText']$. A sample style

sheet is provided.

""")

eg("""

from reportlab.lib.styles import getSampleStyleSheet

stylesheet=getSampleStyleSheet()

normalStyle = stylesheet['Normal']

""")

disc("""

The options which can be set for a $Paragraph$ can be seen from the $ParagraphStyle$ defaults.

""")

heading4("$class ParagraphStyle$")

eg("""

class ParagraphStyle(PropertySet):

    defaults = {

        'fontName':'Times-Roman',

        'fontSize':10,

        'leading':12,

        'leftIndent':0,

        'rightIndent':0,

        'firstLineIndent':0,

        'alignment':TA_LEFT,

        'spaceBefore':0,

        'spaceAfter':0,

        'bulletFontName':'Times-Roman',

        'bulletFontSize':10,

        'bulletIndent':0,

        'textColor': black,

        'backColor':None,

        'wordWrap':None,

        'borderWidth': 0,

        'borderPadding': 0,

        'borderColor': None,

        'borderRadius': None,

        'allowWidows': 1,

        'allowOrphans': 0,

        }

""")

heading2("Using Paragraph Styles")

#this will be used in the ParaBox demos.

sample = """You are hereby charged that on the 28th day of May, 1970, you did

willfully, unlawfully, and with malice of forethought, publish an

alleged English-Hungarian phrase book with intent to cause a breach

of the peace.  How do you plead?"""

disc("""The $Paragraph$ and $ParagraphStyle$ classes together

handle most common formatting needs. The following examples

draw paragraphs in various styles, and add a bounding box

so that you can see exactly what space is taken up.""")

s1 = ParagraphStyle('Normal')

parabox(sample, s1, 'The default $ParagraphStyle$')

disc("""The two attributes $spaceBefore$ and $spaceAfter$ do what they

say, except at the top or bottom of a frame. At the top of a frame,

$spaceBefore$ is ignored, and at the bottom, $spaceAfter$ is ignored.

This means that you could specify that a 'Heading2' style had two

inches of space before when it occurs in mid-page, but will not

get acres of whitespace at the top of a page.  These two attributes

should be thought of as 'requests' to the Frame and are not part

of the space occupied by the Paragraph itself.""")

disc("""The $fontSize$ and $fontName$ tags are obvious, but it is

important to set the $leading$.  This is the spacing between

adjacent lines of text; a good rule of thumb is to make this

20% larger than the point size.  To get double-spaced text,

use a high $leading$. If you set $autoLeading$(default $"off"$) to $"min"$(use observed leading even if smaller than specified) or $"max"$(use the larger of observed and specified) then an attempt is made to determine the leading

on a line by line basis. This may be useful if the lines contain different font sizes etc.""")

disc("""The figure below shows space before and after and an

increased leading:""")

parabox(sample,

        ParagraphStyle('Spaced',

                       spaceBefore=6,

                       spaceAfter=6,

                       leading=16),

        'Space before and after and increased leading'

        )

disc("""The $leftIndent$ and $rightIndent$ attributes do exactly

what you would expect; $firstLineIndent$ is added to the $leftIndent$ of the

first line. If you want a straight left edge, remember

to set $firstLineIndent$ equal to 0.""")

parabox(sample,

        ParagraphStyle('indented',

                       firstLineIndent=+24,

                       leftIndent=24,

                       rightIndent=24),

        'one third inch indents at left and right, two thirds on first line'

        )

disc("""Setting $firstLineIndent$ equal to a negative number, $leftIndent$

much higher, and using a

different font (we'll show you how later!) can give you a

definition list:.""")

parabox('<b><i>Judge Pickles: </i></b>' + sample,

        ParagraphStyle('dl',

                       leftIndent=36),

        'Definition Lists'

        )

disc("""There are four possible values of $alignment$, defined as

constants in the module <i>reportlab.lib.enums</i>.  These are

TA_LEFT, TA_CENTER or TA_CENTRE, TA_RIGHT and

TA_JUSTIFY, with values of 0, 1, 2 and 4 respectively.  These

do exactly what you would expect.""")

disc("""Set $wordWrap$ to $'CJK'$ to get Asian language linewrapping. For normal western text you can change the way

the line breaking algorithm handles <i>widows</i> and <i>orphans</i> with the $allowWidows$ and $allowOrphans$ values.

Both should normally be set to $0$, but for historical reasons we have allowed <i>widows</i>.

The default color of the text can be set with $textColor$ and the paragraph background

colour can be set with $backColor$. The paragraph's border properties may be changed using

$borderWidth$, $borderPadding$, $borderColor$ and $borderRadius$.""")

heading2("Paragraph XML Markup Tags")

disc("""XML markup can be used to modify or specify the

overall paragraph style, and also to specify intra-

paragraph markup.""")

heading3("The outermost < para > tag")

disc("""

The paragraph text may optionally be surrounded by

<para attributes....>

</para>

tags. The attributes if any of the opening <para> tag affect the style that is used

with the $Paragraph$ $text$ and/or $bulletText$.

""")

disc(" ")

from reportlab.platypus.paraparser import _addAttributeNames, _paraAttrMap, _bulletAttrMap

def getAttrs(A):

    _addAttributeNames(A)

    S={}

    for k, v in A.items():

        a = v[0]

        if not S.has_key(a):

            S[a] = k

        else:

            S[a] = "%s, %s" %(S[a],k)

    K = S.keys()

    K.sort()

    D=[('Attribute','Synonyms')]

    for k in K:

        D.append((k,S[k]))

    cols=2*[None]

    rows=len(D)*[None]

    return D,cols,rows

t=apply(Table,getAttrs(_paraAttrMap))

t.setStyle(TableStyle([

            ('FONT',(0,0),(-1,1),'Times-Bold',10,12),

            ('FONT',(0,1),(-1,-1),'Courier',8,8),

            ('VALIGN',(0,0),(-1,-1),'MIDDLE'),

            ('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),

            ('BOX', (0,0), (-1,-1), 0.25, colors.black),

            ]))

getStory().append(t)

caption("""Table <seq template="%(Chapter)s-%(Table+)s"/> - Synonyms for style attributes""")

disc("""Some useful synonyms have been provided for our Python attribute

names, including lowercase versions, and the equivalent properties

from the HTML standard where they exist.  These additions make

it much easier to build XML-printing applications, since

much intra-paragraph markup may not need translating. The

table below shows the allowed attributes and synonyms in the

outermost paragraph tag.""")

heading2("Intra-paragraph markup")

disc("""'<![CDATA[Within each paragraph, we use a basic set of XML tags

to provide markup.  The most basic of these are bold (<b>...</b>),

italic (<i>...</i>) and underline (<u>...</u>).

Other tags which are allowed are strong (<strong>...</strong>), and strike through (<strike>...</strike>). The <link> and <a> tags

may be used to refer to URIs, documents or bookmarks in the current document. The a variant of the <a> tag can be used to

mark a position in a document.

A break (<br/>) tag is also allowed.]]>

""")

parabox2("""<b>You are hereby charged</b> that on the 28th day of May, 1970, you did

willfully, unlawfully, and <i>with malice of forethought</i>, publish an

alleged English-Hungarian phrase book with intent to cause a breach

of the peace.  <u>How do you plead</u>?""", "Simple bold and italic tags")

parabox2("""This <a href="#MYANCHOR" color="blue">is a link to</a> an anchor tag ie <a name="MYANCHOR"/><font color="green">here</font>.

This <link href="#MYANCHOR" color="blue" fontName="Helvetica">is another link to</link> the same anchor tag.""",

"anchors and links")

disc("""The <b>link</b> tag can be used as a reference, but

not as an anchor. The a and link hyperlink tags have additional attributes <i>fontName</i>,

<i>fontSize</i>, <i>color</i> &amp; <i>backColor</i> attributes.

The hyperlink reference can have a scheme of <b>http:</b><i>(external webpage)</i>, <b>pdf:</b><i>(different pdf document)</i> or 

<b>document:</b><i>(same pdf document)</i>; a missing scheme is treated as <b>document</b> as is the case when the reference starts with # (in which case the anchor should omit it). Any other scheme is treated as some kind of URI.

""")

parabox2("""<strong>You are hereby charged</strong> that on the 28th day of May, 1970, you did

willfully, unlawfully, <strike>and with malice of forethought</strike>, <br/>publish an

alleged English-Hungarian phrase book with intent to cause a breach

of the peace. How do you plead?""", "Strong, strike, and break tags")

heading3("The $<font>$ tag")

disc("""The $<font>$ tag can be used to change the font name,

size and text color for any substring within the paragraph.

Legal attributes are $size$, $face$, $name$ (which is the same as $face$),

$color$, and $fg$ (which is the same as $color$). The $name$ is

the font family name, without any 'bold' or 'italic' suffixes.

Colors may be

HTML color names or a hex string encoded in a variety of ways;

see ^reportlab.lib.colors^ for the formats allowed.""")

parabox2("""<font face="times" color="red">You are hereby charged</font> that on the 28th day of May, 1970, you did

willfully, unlawfully, and <font size=14>with malice of forethought</font>,

publish an

alleged English-Hungarian phrase book with intent to cause a breach

of the peace.  How do you plead?""", "The $font$ tag")

heading3("Superscripts and Subscripts")

disc("""Superscripts and subscripts are supported with the

<![CDATA[<super> and <sub> tags, which work exactly

as you might expect.  In addition, most greek letters

can be accessed by using the <greek></greek>

tag, or with mathML entity names.]]>""")

##parabox2("""<greek>epsilon</greek><super><greek>iota</greek>

##<greek>pi</greek></super> = -1""", "Greek letters and subscripts")

parabox2("""Equation (&alpha;): <greek>e</greek> <super><greek>ip</greek></super>  = -1""",

         "Greek letters and superscripts")

heading3("Inline Images")

disc("""We can embed images in a paragraph with the 

<img/> tag which has attributes $src$, $width$, $height$ whose meanings are obvious. The $valign$ attribute may be set to a css like value from

"baseline", "sub", "super", "top", "text-top", "middle", "bottom", "text-bottom"; the value may also be a numeric percentage or an absolute value.

""")

parabox2("""<para autoLeading="off" fontSize=12>This &lt;img/&gt; <img src="../images/testimg.gif" valign="top"/> is aligned <b>top</b>.<br/><br/>

This &lt;img/&gt; <img src="../images/testimg.gif" valign="bottom"/> is aligned <b>bottom</b>.<br/><br/>

This &lt;img/&gt; <img src="../images/testimg.gif" valign="middle"/> is aligned <b>middle</b>.<br/><br/>

This &lt;img/&gt; <img src="../images/testimg.gif" valign="-4"/> is aligned <b>-4</b>.<br/><br/>

This &lt;img/&gt; <img src="../images/testimg.gif" valign="+4"/> is aligned <b>+4</b>.<br/><br/>

This &lt;img/&gt; <img src="../images/testimg.gif" width="10"/> has width <b>10</b>.<br/><br/>

</para>""","Inline images")

heading3("Numbering Paragraphs and Lists")

disc("""The $<seq>$ tag provides comprehensive support

for numbering lists, chapter headings and so on.  It acts as

an interface to the $Sequencer$ class in ^reportlab.lib.sequencer^.

These are used to number headings and figures throughout this

document.

You may create as many separate 'counters' as you wish, accessed

with the $id$ attribute; these will be incremented by one each

time they are accessed.  The $seqreset$ tag resets a counter.

If you want it to resume from a number other than 1, use

the syntax <seqreset id="mycounter" base="42">.

Let's have a go:""")

parabox2("""<seq id="spam"/>, <seq id="spam"/>, <seq id="spam"/>.

Reset<seqreset id="spam"/>.  <seq id="spam"/>, <seq id="spam"/>,

<seq id="spam"/>.""",  "Basic sequences")

disc("""You can save specifying an ID by designating a counter ID

as the <i>default</i> using the &lt;seqdefault id="Counter"&gt;

tag; it will then be used whenever a counter ID

is not specified.  This saves some typing, especially when

doing multi-level lists; you just change counter ID when

stepping in or out a level.""")

parabox2("""<seqdefault id="spam"/>Continued... <seq/>,

<seq/>, <seq/>, <seq/>, <seq/>, <seq/>, <seq/>.""",

"The default sequence")

disc("""Finally, one can access multi-level sequences using

a variation of Python string formatting and the $template$

attribute in a <seq> tags.  This is used to do the

captions in all of the figures, as well as the level two

headings.  The substring $%(counter)s$ extracts the current

value of a counter without incrementing it; appending a

plus sign as in $%(counter)s$ increments the counter.

The figure captions use a pattern like the one below:""")

parabox2("""Figure <seq template="%(Chapter)s-%(FigureNo+)s"/> - Multi-level templates""",

"Multi-level templates")

disc("""We cheated a little - the real document used 'Figure',

but the text above uses 'FigureNo' - otherwise we would have

messed up our numbering!""")

heading2("Bullets and Paragraph Numbering")

disc("""In addition to the three indent properties, some other

parameters are needed to correctly handle bulleted and numbered

lists.  We discuss this here because you have now seen how

to handle numbering.  A paragraph may have an optional

^bulletText^ argument passed to its constructor; alternatively,

bullet text may be placed in a $<![CDATA[<bullet>..</bullet>]]>$

tag at its head.  The text will be drawn on the first line of

the paragraph, with its x origin determined by the $bulletIndent$

attribute of the style, and in the font given in the

$bulletFontName$ attribute.  For genuine bullets, a good

idea is to select the Times-Roman font in the style, and

use a character such as $\\xe2\\x80\\xa2)$:""")

t=apply(Table,getAttrs(_bulletAttrMap))

t.setStyle([

            ('FONT',(0,0),(-1,1),'Times-Bold',10,12),

            ('FONT',(0,1),(-1,-1),'Courier',8,8),

            ('VALIGN',(0,0),(-1,-1),'MIDDLE'),

            ('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),

            ('BOX', (0,0), (-1,-1), 0.25, colors.black),

            ])

getStory().append(t)

caption("""Table <seq template="%(Chapter)s-%(Table+)s"/> - &lt;bullet&gt; attributes &amp; synonyms""")

disc("""The <bullet> tag is only allowed once in a given paragraph and its use

overrides the implied bullet style and ^bulletText^ specified in the  ^Paragraph^

creation.

""")

parabox("""<bullet>\xe2\x80\xa2</bullet>this is a bullet point.  Spam

spam spam spam spam spam spam spam spam spam spam spam

spam spam spam spam spam spam spam spam spam spam """,

        styleSheet['Bullet'],

        'Basic use of bullet points')

disc("""Exactly the same technique is used for numbers,

except that a sequence tag is used.  It is also possible

to put  a multi-character string in the bullet; with a deep

indent and bold bullet font, you can make a compact

definition list.""")