B \@sdZddlmZddlZddlZddlZyddlmZWn e k rXddl mZYnXddl Z ddl Z ddl mZddlmZddlmZmZmZmZmZmZd d d d d ddgZedZedejZGdd d eZGdddeZGdddeZ ddZ!Gdd d e"Z#dXdd Z$dYddZ%Gddde&Z'Gddde"Z(dZd d!Z)d"d#Z*d$d%Z+Gd&d d e#Z,d'd Z-Gd(d)d)e"Z.Gd*d+d+e"Z/Gd,d-d-e"Z0Gd.d/d/e"Z1e1Z2[1d[d0d1Z3ed2Z4d3d4d5d6d7d8gZ5ed9Z6ed:Z7d;d<Z8d=d>Z9d\d?d@Z:d]dBdCZ;dDdEZdJdKZ?dLdMZ@dNdOZAdPdQZBdRdSZCdTZDd^dUdVZEeFdWkr|eEdS)_a 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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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 Nr/r0Frrz%s|%sz%s inside expression)rrz%s outside expressionTzNo %s to finish last expression)rr) rr7recompilerfinditergroup find_positionrr rrmtrim_lex)srZtrim_whitespacer4r5Zin_exprZchunkslastlast_posZtoken_rematchrwr{rrrrlexusL           rz.^(?:if |elif |for |def |inherit |default |py:)rendifendforenddefrqrrz \n\r?[\t ]*$z ^[\t ]*\nc Csd}xt|D]\}}t|tr&q|d}t|sB|tkrBq|sLd}n ||d}|dt|krnd}n ||d}t|trt|tsq| pt|}|dkr|sd}|dk r|d|kr|sd}|r|rt |s|t|dkr|s|r^|dkr|r&|dkr4d||d<n*t|}|d| d}|||d<|r|}|t|dkr|sd||d<qt |}|| d}|||d<qW|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'] NrrcrTrPr) enumeraterlr statement_researchsingle_statementsrVtrail_whitespace_restriplead_whitespace_rerr) tokensZ last_trimiZcurrentroprev next_chunkZprev_okmrrrrsN          rcCsJ|d||}|dkr*||d||}n|d||}|d||fS)z/Given a string and index, return (line, column) rr)countrfind)stringindexZ last_indexrlinescolumnrrrrs rcCsV|dkrtjdtjdf}t||||d}g}x |rPt||\}}||q2W|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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