o f@sdZddlmZddlZddlZddlZddlZddlmZddl m Z ddl m Z m Z mZmZmZmZgdZed Zed ejZGd d d eZGd ddeZGdddeZddZGdddeZdGddZdGddZGddde Z!GdddeZ"GdddeZ#Gdd d eZ$Gd!d"d"eZ%e%Z&[%dHd$d%Z'ed&Z(gd'Z)ed(Z*ed)Z+d*d+Z,d,d-Z-dId.d/Z.dJd1d2Z/d3d4Z0d5d6Z1d7d8Z2d9d:Z3d;d<Z4d=d>Z5d?d@Z6dAdBZ7dCZ8dGdDdEZ9e:dFkre9dSdS)Ka A small templating language This implements a small templating language. This language implements if/elif/else, for/continue/break, expressions, and blocks of Python code. The syntax is:: {{any expression (function calls etc)}} {{any expression | filter}} {{for x in y}}...{{endfor}} {{if x}}x{{elif y}}y{{else}}z{{endif}} {{py:x=1}} {{py: def foo(bar): return 'baz' }} {{default var = default_value}} {{# comment}} You use this with the ``Template`` class or the ``sub`` shortcut. The ``Template`` class takes the template string and the name of the template (for errors) and a default namespace. 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zTemplateObjectGetter.__init__cCst|j|tSr)rrEmpty)rattrrrrrsz TemplateObjectGetter.__getattr__cCr)Nz<%s around %r>)r-rrrZrrrr[rzTemplateObjectGetter.__repr__N)rr r!rrr[rrrrrs rc@sNeZdZddZddZddZddZd d Zd d Ze j d kr%eZ dSdS)_EmptycOs|Srr)rrrdrrrrz_Empty.__call__cCdSNrlrrZrrrr rz_Empty.__str__cCr)NrrrZrrrr[rz_Empty.__repr__cCrrrrZrrr __unicode__rz_Empty.__unicode__cCstdS)Nr)iterrZrrr__iter__sz_Empty.__iter__cCr)NFrrZrrr__bool__rz_Empty.__bool__3N) rr r!rrr[rrrrAversion __nonzero__rrrrrs rTcCsp|durtjdtjdf}d}g}d}|ddf}tdt|dt|df} | |D]c} | d} t|| ||} | |dkrU|rUt d|d| |d | |dkrh|sht d |d| |d | |dkr||| } | r}| | d }n| ||| |fd}| }| }q2|rt d |d||d ||d} | r| | |rt |}|S)aY Lex a string into chunks: >>> lex('hey') ['hey'] >>> lex('hey {{you}}') ['hey ', ('you', (1, 7))] >>> lex('hey {{') Traceback (most recent call last): ... TemplateError: No }} to finish last expression at line 1 column 7 >>> lex('hey }}') Traceback (most recent call last): ... TemplateError: }} outside expression at line 1 column 7 >>> lex('hey {{ {{') Traceback (most recent call last): ... TemplateError: {{ inside expression at line 1 column 10 Nr1r2Frrz%s|%sz%s inside expressionrqz%s outside expressionTzNo %s to finish last expression)rr) r r=recompileescapefinditergroup find_positionrr rrztrim_lex)srtrim_whitespacer7r8in_exprchunkslastlast_postoken_rematchrrrrrrlex%sV          rz.^(?:if |elif |for |def |inherit |default |py:))rendifendforenddefrrz \n\r?[\t ]*$z ^[\t ]*\nc Csd}t|D]\}}t|trq|d}t|s|tvrq|s#d}n||d}|dt|kr4d}n||d}t|trDt|tsEq| pLt|}|dkrW|sWd}|durg|d|krg|sgd}|r|r|t |s||t|dkr|s|r|dkr|r|dkrd||d<nt|}|d| d}|||d<|r|}|t|dkr|sd||d<qt |}|| d}|||d<q|S)aa Takes a lexed set of tokens, and removes whitespace when there is a directive on a line by itself: >>> tokens = lex('{{if x}}\nx\n{{endif}}\ny', trim_whitespace=False) >>> tokens [('if x', (1, 3)), '\nx\n', ('endif', (3, 3)), '\ny'] >>> trim_lex(tokens) [('if x', (1, 3)), 'x\n', ('endif', (3, 3)), 'y'] NrrlrTrWr) enumerateryr statement_researchsingle_statementsr_trail_whitespace_restriplead_whitespace_rerr) tokens last_trimicurrentr}prev next_chunkprev_okmrrrrjsX         rcCsJ|d||}|dkr||d||}n|d||}|d||fS)z/Given a string and index, return (line, column) rr)countrfind)stringindex last_indexrlinescolumnrrrrs rcCsT|durtjdtjdf}t||||d}g}|r(t||\}}|||s|S)a Parses a string into a kind of AST >>> parse('{{x}}') [('expr', (1, 3), 'x')] >>> parse('foo') ['foo'] >>> parse('{{if x}}test{{endif}}') [('cond', (1, 3), ('if', (1, 3), 'x', ['test']))] >>> parse('series->{{for x in y}}x={{x}}{{endfor}}') ['series->', ('for', (1, 11), ('x',), 'y', ['x=', ('expr', (1, 27), 'x')])] >>> parse('{{for x, y in z:}}{{continue}}{{endfor}}') [('for', (1, 3), ('x', 'y'), 'z', [('continue', (1, 21))])] >>> parse('{{py:x=1}}') [('py', (1, 3), 'x=1')] >>> parse('{{if x}}a{{elif y}}b{{else}}c{{endif}}') [('cond', (1, 3), ('if', (1, 3), 'x', ['a']), ('elif', (1, 12), 'y', ['b']), ('else', (1, 23), None, ['c']))] Some exceptions:: >>> parse('{{continue}}') Traceback (most recent call last): ... TemplateError: continue outside of for loop at line 1 column 3 >>> parse('{{if x}}foo') Traceback (most recent call last): ... TemplateError: No {{endif}} at line 1 column 3 >>> parse('{{else}}') Traceback (most recent call last): ... TemplateError: else outside of an if block at line 1 column 3 >>> parse('{{if x}}{{for x in y}}{{endif}}{{endfor}}') Traceback (most recent call last): ... TemplateError: Unexpected endif at line 1 column 25 >>> parse('{{if}}{{endif}}') Traceback (most recent call last): ... TemplateError: if with no expression at line 1 column 3 >>> parse('{{for x y}}{{endfor}}') Traceback (most recent call last): ... TemplateError: Bad for (no "in") in 'x y' at line 1 column 3 >>> parse('{{py:x=1\ny=2}}') Traceback (most recent call last): ... 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