File: //lib64/python2.7/site-packages/mercurial/templater.pyc
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This module provides low-level interface to the template engine. See the
formatter and cmdutil modules if you are looking for high-level functions
such as ``cmdutil.rendertemplate(ctx, tmpl)``.
Internal Data Types
-------------------
Template keywords and functions take a dictionary of current symbols and
resources (a "mapping") and return result. Inputs and outputs must be one
of the following data types:
bytes
a byte string, which is generally a human-readable text in local encoding.
generator
a lazily-evaluated byte string, which is a possibly nested generator of
values of any printable types, and will be folded by ``stringify()``
or ``flatten()``.
None
sometimes represents an empty value, which can be stringified to ''.
True, False, int, float
can be stringified as such.
wrappedbytes, wrappedvalue
a wrapper for the above printable types.
date
represents a (unixtime, offset) tuple.
hybrid
represents a list/dict of printable values, which can also be converted
to mappings by % operator.
hybriditem
represents a scalar printable value, also supports % operator.
mappinggenerator, mappinglist
represents mappings (i.e. a list of dicts), which may have default
output format.
mappedgenerator
a lazily-evaluated list of byte strings, which is e.g. a result of %
operation.
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>>> _parsetemplate(b'foo{bar}"baz', 0, 12)
([('string', 'foo'), ('symbol', 'bar'), ('string', '"baz')], 12)
>>> _parsetemplate(b'foo{bar}"baz', 0, 12, quote=b'"')
([('string', 'foo'), ('symbol', 'bar')], 9)
>>> _parsetemplate(b'foo"{bar}', 0, 9, quote=b'"')
([('string', 'foo')], 4)
>>> _parsetemplate(br'foo\"bar"baz', 0, 12, quote=b'"')
([('string', 'foo"'), ('string', 'bar')], 9)
>>> _parsetemplate(br'foo\\"bar', 0, 10, quote=b'"')
([('string', 'foo\\')], 6)
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If raw=True, a backslash is not taken as an escape character just like
r'' string in Python. Note that this is different from r'' literal in
template in that no template fragment can appear in r'', e.g. r'{foo}'
is a literal '{foo}', but ('{foo}', raw=True) is a template expression
'foo'.
>>> list(scantemplate(b'foo{bar}"baz'))
[('string', 0, 3), ('template', 3, 8), ('string', 8, 12)]
>>> list(scantemplate(b'outer{"inner"}outer'))
[('string', 0, 5), ('template', 5, 14), ('string', 14, 19)]
>>> list(scantemplate(b'foo\\{escaped}'))
[('string', 0, 5), ('string', 5, 13)]
>>> list(scantemplate(b'foo\\{escaped}', raw=True))
[('string', 0, 4), ('template', 4, 13)]
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>>> def f(tree):
... print(pycompat.sysstr(prettyformat(_unnesttemplatelist(tree))))
>>> f((b'template', []))
(string '')
>>> f((b'template', [(b'string', b'foo')]))
(string 'foo')
>>> f((b'template', [(b'string', b'foo'), (b'symbol', b'rev')]))
(template
(string 'foo')
(symbol 'rev'))
>>> f((b'template', [(b'symbol', b'rev')])) # template(rev) -> str
(template
(symbol 'rev'))
>>> f((b'template', [(b'template', [(b'string', b'foo')])]))
(string 'foo')
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>>> _parseexpr(b'"foo"')
('string', 'foo')
>>> _parseexpr(b'foo(bar)')
('func', ('symbol', 'foo'), ('symbol', 'bar'))
>>> _parseexpr(b'foo(')
Traceback (most recent call last):
...
ParseError: ('not a prefix: end', 4)
>>> _parseexpr(b'"foo" "bar"')
Traceback (most recent call last):
...
ParseError: ('invalid token', 7)
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>>> context = engine(lambda t: (templateutil.runsymbol, t))
>>> def fargs(expr, argspec):
... x = _parseexpr(expr)
... n = getsymbol(x[1])
... return _buildfuncargs(x[2], context, exprmethods, n, argspec)
>>> list(fargs(b'a(l=1, k=2)', b'k l m').keys())
['l', 'k']
>>> args = fargs(b'a(opts=1, k=2)', b'**opts')
>>> list(args.keys()), list(args[b'opts'].keys())
(['opts'], ['opts', 'k'])
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template expansion works like this. a map file contains key=value
pairs. if value is quoted, it is treated as string. otherwise, it
is treated as name of template file.
templater is asked to expand a key in map. it looks up key, and
looks for strings like this: {foo}. it expands {foo} by looking up
foo in map, and substituting it. expansion is recursive: it stops
when there is no more {foo} to replace.
expansion also allows formatting and filtering.
format uses key to expand each item in list. syntax is
{key%format}.
filter uses function to transform value. syntax is
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