Figure 28 The csv2htmlpy program s structure in Java

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been de ned The order in which the functions appear in the le (ie, the order in which they are created) does not matter In the csv2htmlpy program, the rst function we call is main() which in turn calls print_start() and then print_line() And print_line() calls extract_ fields() and escape_html() The program structure we have used is shown in Figure 28
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import sys def main(): def print_start(): def print_line(): calls def extract_fields(): def escape_html(): def print_end(): main()
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Figure 28 The csv2htmlpy program s structure
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When Python reads a le it begins at the top So for this example, it starts by performing the import, then it creates the main() function, and then it creates the other functions in the order in which they appear in the le When Python nally reaches the call to main() at the end of the le, all the functions that main() will call (and all the functions that those functions will call) now exist Execution as we normally think of it begins where the call to main() is made We will look at each function in turn, starting with main()
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def main(): maxwidth = 100 print_start() count = 0 while True: try: line = input() if count == 0: color = "lightgreen" elif count % 2: color = "white" else: color = "lightyellow"
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print_line(line, color, maxwidth) count += 1 except EOFError: break print_end()
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The maxwidth variable is used to constrain the number of characters in a cell if a eld is bigger than this we will truncate it and signify this by adding an ellipsis to the truncated text We ll look at the print_start(), print_line(), and print_end() functions in a moment The while loop iterates over each line of input this could come from the user typing at the keyboard, but we expect it to be a redirected le We set the color we want to use and call print_line() to output the line as an HTML table row
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def print_start(): print("<table border='1'>") def print_end(): print("</table>")
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We could have avoided creating these two functions and simply put the relevant print() function calls in main() But we prefer to separate out the logic since this is more exible, even though it doesn t really matter in this small example
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def print_line(line, color, maxwidth): print("<tr bgcolor='{0}'>"format(color)) fields = extract_fields(line) for field in fields: if not field: print("<td></td>") else: number = fieldreplace(",", "") try: x = float(number) print("<td align='right'>{0:d}</td>"format(round(x))) except ValueError: field = fieldtitle() field = fieldreplace(" And ", " and ") if len(field) <= maxwidth: field = escape_html(field) else: field = "{0} "format( escape_html(field[:maxwidth])) print("<td>{0}</td>"format(field)) print("</tr>")
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We cannot use strsplit(",") to split each line into elds because commas can occur inside quoted strings So we have farmed this work out to the extract_fields() function Once we have a list of the elds (as strings, with no surrounding quotes), we iterate over them, creating a table cell for each one If a eld is empty, we output an empty cell If a eld is quoted, it could be a string or it could be a number that has been quoted to allow for internal commas, for example, "1,566" To account for this, we make a copy of the eld with commas removed and try to convert the eld to a float If the conversion is successful we output a right-aligned cell with the eld rounded to the nearest whole number and output it as an integer If the conversion fails we output the eld as a string In this case we use strtitle() to neaten the case of the letters and we replace the word And with and as a correction to strtitle() s effect If the eld isn t too long we use all of it, otherwise we truncate it to maxwidth characters and add an ellipsis to signify the truncation, and in either case we escape any special HTML characters the eld might contain
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def extract_fields(line): fields = [] field = "" quote = None for c in line: if c in "\"'": if quote is None: # start of quoted string quote = c elif quote == c: # end of quoted string quote = None else: field += c # other quote inside quoted string continue if quote is None and c == ",": # end of a field fieldsappend(field) field = "" else: field += c # accumulating a field if field: fieldsappend(field) # adding the last field return fields
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This function reads the line it is given character by character, accumulating a list of elds each one a string without any enclosing quotes The function copes with elds that are unquoted, and with elds that are quoted with single or double quotes, and correctly handles commas and quotes (single quotes in double quoted strings, double quotes in single quoted strings)
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def escape_html(text): text = textreplace("&", "&") text = textreplace("<", "<") text = textreplace(">", ">") return text
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