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Refactor to isolate HTML encoding step from the parsing step.

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This commit is contained in:
Raymond Hettinger 2012-07-03 13:13:52 -07:00
parent 3575f910d9
commit 5da6039765
1 changed files with 22 additions and 17 deletions
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39
Tools/scripts/highlight.py
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@ -10,24 +10,23 @@ def is_builtin(s):
'Return True if s is the name of a builtin'
return s in vars(__builtins__)
def escape_range(lines, start, end):
'Return escaped content from a range of lines between start and end'
def combine_range(lines, start, end):
'Join content from a range of lines between start and end'
(srow, scol), (erow, ecol) = start, end
if srow == erow:
rows = [lines[srow-1][scol:ecol]]
else:
rows = [lines[srow-1][scol:]] + lines[srow: erow-1] + [lines[erow-1][:ecol]]
return cgi.escape(''.join(rows)), end
return ''.join(rows), end
def colorize(source):
'Convert Python source code to an HTML fragment with colorized markup'
def isolate_tokens(source):
'Generate chunks of source and indentify chunks to be highlighted'
lines = source.splitlines(True)
lines.append('')
readline = functools.partial(next, iter(lines), '')
kind = tok_str = ''
tok_type = tokenize.COMMENT
written = (1, 0)
result = []
for tok in tokenize.generate_tokens(readline):
prev_tok_type, prev_tok_str = tok_type, tok_str
tok_type, tok_str, (srow, scol), (erow, ecol), logical_lineno = tok
@ -49,23 +48,29 @@ def colorize(source):
kind = 'keyword'
elif is_builtin(tok_str) and prev_tok_str != '.':
kind = 'builtin'
if kind:
line_upto_token, written = escape_range(lines, written, (srow, scol))
line_thru_token, written = escape_range(lines, written, (erow, ecol))
result += [line_upto_token, '<span class="%s">' % kind,
line_thru_token, '</span>']
else:
line_thru_token, written = escape_range(lines, written, (erow, ecol))
result += [line_thru_token]
line_upto_token, written = combine_range(lines, written, (srow, scol))
line_thru_token, written = combine_range(lines, written, (erow, ecol))
yield kind, line_upto_token, line_thru_token
result.insert(0, '<pre class="python">\n')
result.append('</pre>\n')
def colorize(source):
'Convert Python source code to an HTML fragment with colorized markup'
result = ['<pre class="python">\n']
for kind, line_upto_token, line_thru_token in isolate_tokens(source):
if kind:
result += [cgi.escape(line_upto_token),
'<span class="%s">' % kind,
cgi.escape(line_thru_token),
'</span>']
else:
result += [cgi.escape(line_upto_token),
cgi.escape(line_thru_token)]
result += ['</pre>\n']
return ''.join(result)
default_css = {
'.comment': '{color: crimson;}',
'.string': '{color: forestgreen;}',
'.docstring': '{color: forestgreen; font-style:italic}',
'.docstring': '{color: forestgreen; font-style:italic;}',
'.keyword': '{color: darkorange;}',
'.builtin': '{color: purple;}',
'.definition': '{color: darkorange; font-weight:bold;}',