Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 1 | # -*- coding: utf-8 -*- |
| 2 | """ |
| 3 | jinja2.parser |
| 4 | ~~~~~~~~~~~~~ |
| 5 | |
| 6 | Implements the template parser. |
| 7 | |
| 8 | :copyright: 2008 by Armin Ronacher. |
| 9 | :license: BSD, see LICENSE for more details. |
| 10 | """ |
Armin Ronacher | f59bac2 | 2008-04-20 13:11:43 +0200 | [diff] [blame] | 11 | from operator import itemgetter |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 12 | from jinja2 import nodes |
| 13 | from jinja2.exceptions import TemplateSyntaxError |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 14 | |
| 15 | |
Armin Ronacher | 2feed1d | 2008-04-26 16:26:52 +0200 | [diff] [blame] | 16 | statement_end_tokens = set(['variable_end', 'block_end', 'in']) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 17 | _statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print', |
Armin Ronacher | 0611e49 | 2008-04-25 23:44:14 +0200 | [diff] [blame] | 18 | 'macro', 'include', 'from', 'import']) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 19 | _compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq', 'in']) |
Armin Ronacher | b5124e6 | 2008-04-25 00:36:14 +0200 | [diff] [blame] | 20 | _tuple_edge_tokens = set(['rparen']) | statement_end_tokens |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 21 | |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 22 | |
| 23 | class Parser(object): |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 24 | """The template parser class. |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 25 | |
| 26 | Transforms sourcecode into an abstract syntax tree. |
| 27 | """ |
| 28 | |
| 29 | def __init__(self, environment, source, filename=None): |
| 30 | self.environment = environment |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 31 | if isinstance(filename, unicode): |
| 32 | filename = filename.encode('utf-8') |
Armin Ronacher | bf7c4ad | 2008-04-12 12:02:36 +0200 | [diff] [blame] | 33 | self.source = unicode(source) |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 34 | self.filename = filename |
| 35 | self.closed = False |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 36 | self.stream = environment.lexer.tokenize(source, filename) |
Armin Ronacher | 0553093 | 2008-04-20 13:27:49 +0200 | [diff] [blame] | 37 | self.extensions = {} |
| 38 | for extension in environment.extensions: |
| 39 | for tag in extension.tags: |
| 40 | self.extensions[tag] = extension.parse |
Armin Ronacher | 07bc684 | 2008-03-31 14:18:49 +0200 | [diff] [blame] | 41 | |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 42 | def parse_statement(self): |
| 43 | """Parse a single statement.""" |
| 44 | token_type = self.stream.current.type |
| 45 | if token_type in _statement_keywords: |
| 46 | return getattr(self, 'parse_' + token_type)() |
| 47 | elif token_type is 'call': |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 48 | return self.parse_call_block() |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 49 | elif token_type is 'filter': |
| 50 | return self.parse_filter_block() |
Armin Ronacher | f59bac2 | 2008-04-20 13:11:43 +0200 | [diff] [blame] | 51 | elif token_type is 'name': |
| 52 | ext = self.extensions.get(self.stream.current.value) |
| 53 | if ext is not None: |
| 54 | return ext(self) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 55 | lineno = self.stream.current |
Armin Ronacher | 8efc522 | 2008-04-08 14:47:40 +0200 | [diff] [blame] | 56 | expr = self.parse_tuple() |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 57 | if self.stream.current.type == 'assign': |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 58 | result = self.parse_assign(expr) |
| 59 | else: |
| 60 | result = nodes.ExprStmt(expr, lineno=lineno) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 61 | return result |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 62 | |
| 63 | def parse_assign(self, target): |
| 64 | """Parse an assign statement.""" |
| 65 | lineno = self.stream.expect('assign').lineno |
| 66 | if not target.can_assign(): |
| 67 | raise TemplateSyntaxError("can't assign to '%s'" % |
Armin Ronacher | 4f7d2d5 | 2008-04-22 10:40:26 +0200 | [diff] [blame] | 68 | target.__class__.__name__.lower(), |
| 69 | target.lineno, self.filename) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 70 | expr = self.parse_tuple() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 71 | target.set_ctx('store') |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 72 | return nodes.Assign(target, expr, lineno=lineno) |
| 73 | |
| 74 | def parse_statements(self, end_tokens, drop_needle=False): |
Armin Ronacher | f59bac2 | 2008-04-20 13:11:43 +0200 | [diff] [blame] | 75 | """Parse multiple statements into a list until one of the end tokens |
| 76 | is reached. This is used to parse the body of statements as it also |
| 77 | parses template data if appropriate. |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 78 | """ |
| 79 | # the first token may be a colon for python compatibility |
| 80 | if self.stream.current.type is 'colon': |
| 81 | self.stream.next() |
| 82 | |
Armin Ronacher | 2b60fe5 | 2008-04-21 08:23:59 +0200 | [diff] [blame] | 83 | # in the future it would be possible to add whole code sections |
| 84 | # by adding some sort of end of statement token and parsing those here. |
| 85 | self.stream.expect('block_end') |
| 86 | result = self.subparse(end_tokens) |
| 87 | |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 88 | if drop_needle: |
| 89 | self.stream.next() |
| 90 | return result |
| 91 | |
| 92 | def parse_for(self): |
| 93 | """Parse a for loop.""" |
| 94 | lineno = self.stream.expect('for').lineno |
| 95 | target = self.parse_tuple(simplified=True) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 96 | if not target.can_assign(): |
| 97 | raise TemplateSyntaxError("can't assign to '%s'" % |
Armin Ronacher | 4f7d2d5 | 2008-04-22 10:40:26 +0200 | [diff] [blame] | 98 | target.__class__.__name__.lower(), |
| 99 | target.lineno, self.filename) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 100 | target.set_ctx('store') |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 101 | self.stream.expect('in') |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 102 | iter = self.parse_tuple(no_condexpr=True) |
| 103 | test = None |
| 104 | if self.stream.current.type is 'if': |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 105 | self.stream.next() |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 106 | test = self.parse_expression() |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 107 | body = self.parse_statements(('endfor', 'else')) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 108 | if self.stream.next().type is 'endfor': |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 109 | else_ = [] |
| 110 | else: |
| 111 | else_ = self.parse_statements(('endfor',), drop_needle=True) |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 112 | return nodes.For(target, iter, body, else_, test, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 113 | |
| 114 | def parse_if(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 115 | """Parse an if construct.""" |
| 116 | node = result = nodes.If(lineno=self.stream.expect('if').lineno) |
| 117 | while 1: |
| 118 | # TODO: exclude conditional expressions here |
| 119 | node.test = self.parse_tuple() |
| 120 | node.body = self.parse_statements(('elif', 'else', 'endif')) |
| 121 | token_type = self.stream.next().type |
| 122 | if token_type is 'elif': |
| 123 | new_node = nodes.If(lineno=self.stream.current.lineno) |
| 124 | node.else_ = [new_node] |
| 125 | node = new_node |
| 126 | continue |
| 127 | elif token_type is 'else': |
| 128 | node.else_ = self.parse_statements(('endif',), |
| 129 | drop_needle=True) |
| 130 | else: |
| 131 | node.else_ = [] |
| 132 | break |
| 133 | return result |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 134 | |
| 135 | def parse_block(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 136 | node = nodes.Block(lineno=self.stream.expect('block').lineno) |
| 137 | node.name = self.stream.expect('name').value |
| 138 | node.body = self.parse_statements(('endblock',), drop_needle=True) |
| 139 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 140 | |
| 141 | def parse_extends(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 142 | node = nodes.Extends(lineno=self.stream.expect('extends').lineno) |
| 143 | node.template = self.parse_expression() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 144 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 145 | |
| 146 | def parse_include(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 147 | node = nodes.Include(lineno=self.stream.expect('include').lineno) |
Armin Ronacher | 0611e49 | 2008-04-25 23:44:14 +0200 | [diff] [blame] | 148 | node.template = self.parse_expression() |
| 149 | return node |
| 150 | |
| 151 | def parse_import(self): |
| 152 | node = nodes.Import(lineno=self.stream.expect('import').lineno) |
| 153 | node.template = self.parse_expression() |
| 154 | self.stream.expect('name:as') |
| 155 | node.target = self.stream.expect('name').value |
| 156 | if not nodes.Name(node.target, 'store').can_assign(): |
| 157 | raise TemplateSyntaxError('can\'t assign imported template ' |
| 158 | 'to %r' % node.target, node.lineno, |
| 159 | self.filename) |
| 160 | return node |
| 161 | |
| 162 | def parse_from(self): |
| 163 | node = nodes.FromImport(lineno=self.stream.expect('from').lineno) |
| 164 | node.template = self.parse_expression() |
| 165 | self.stream.expect('import') |
| 166 | node.names = [] |
| 167 | while 1: |
| 168 | if node.names: |
| 169 | self.stream.expect('comma') |
| 170 | if self.stream.current.type is 'name': |
| 171 | target = nodes.Name(self.stream.current.value, 'store') |
| 172 | if not target.can_assign(): |
| 173 | raise TemplateSyntaxError('can\'t import object named %r' |
| 174 | % target.name, target.lineno, |
| 175 | self.filename) |
| 176 | elif target.name.startswith('__'): |
| 177 | raise TemplateAssertionError('names starting with two ' |
| 178 | 'underscores can not be ' |
| 179 | 'imported', target.lineno, |
| 180 | self.filename) |
Armin Ronacher | 0611e49 | 2008-04-25 23:44:14 +0200 | [diff] [blame] | 181 | self.stream.next() |
Armin Ronacher | 2feed1d | 2008-04-26 16:26:52 +0200 | [diff] [blame] | 182 | if self.stream.current.test('name:as'): |
| 183 | self.stream.next() |
| 184 | alias = self.stream.expect('name') |
| 185 | if not nodes.Name(alias.value, 'store').can_assign(): |
| 186 | raise TemplateSyntaxError('can\'t name imported ' |
| 187 | 'object %r.' % alias.value, |
| 188 | alias.lineno, self.filename) |
| 189 | node.names.append((target.name, alias.value)) |
| 190 | else: |
| 191 | node.names.append(target.name) |
Armin Ronacher | 0611e49 | 2008-04-25 23:44:14 +0200 | [diff] [blame] | 192 | if self.stream.current.type is not 'comma': |
| 193 | break |
| 194 | else: |
| 195 | break |
| 196 | if self.stream.current.type is 'comma': |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 197 | self.stream.next() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 198 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 199 | |
Armin Ronacher | 7108207 | 2008-04-12 14:19:36 +0200 | [diff] [blame] | 200 | def parse_signature(self, node): |
| 201 | node.args = args = [] |
| 202 | node.defaults = defaults = [] |
| 203 | self.stream.expect('lparen') |
| 204 | while self.stream.current.type is not 'rparen': |
| 205 | if args: |
| 206 | self.stream.expect('comma') |
| 207 | token = self.stream.expect('name') |
| 208 | arg = nodes.Name(token.value, 'param', lineno=token.lineno) |
| 209 | if not arg.can_assign(): |
| 210 | raise TemplateSyntaxError("can't assign to '%s'" % |
| 211 | arg.name, arg.lineno, |
| 212 | self.filename) |
| 213 | if self.stream.current.type is 'assign': |
| 214 | self.stream.next() |
| 215 | defaults.append(self.parse_expression()) |
| 216 | args.append(arg) |
| 217 | self.stream.expect('rparen') |
| 218 | |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 219 | def parse_call_block(self): |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 220 | node = nodes.CallBlock(lineno=self.stream.expect('call').lineno) |
Armin Ronacher | 7108207 | 2008-04-12 14:19:36 +0200 | [diff] [blame] | 221 | if self.stream.current.type is 'lparen': |
| 222 | self.parse_signature(node) |
| 223 | |
Armin Ronacher | 8edbe49 | 2008-04-10 20:43:43 +0200 | [diff] [blame] | 224 | node.call = self.parse_expression() |
| 225 | if not isinstance(node.call, nodes.Call): |
| 226 | raise TemplateSyntaxError('expected call', node.lineno, |
| 227 | self.filename) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 228 | node.body = self.parse_statements(('endcall',), drop_needle=True) |
| 229 | return node |
| 230 | |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 231 | def parse_filter_block(self): |
| 232 | node = nodes.FilterBlock(lineno=self.stream.expect('filter').lineno) |
| 233 | node.filter = self.parse_filter(None, start_inline=True) |
| 234 | node.body = self.parse_statements(('endfilter',), drop_needle=True) |
| 235 | return node |
| 236 | |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 237 | def parse_macro(self): |
| 238 | node = nodes.Macro(lineno=self.stream.expect('macro').lineno) |
| 239 | node.name = self.stream.expect('name').value |
Armin Ronacher | f059ec1 | 2008-04-11 22:21:00 +0200 | [diff] [blame] | 240 | # make sure that assignments to that name are allowed |
| 241 | if not nodes.Name(node.name, 'store').can_assign(): |
| 242 | raise TemplateSyntaxError('can\'t assign macro to %r' % |
| 243 | node.target, node.lineno, |
| 244 | self.filename) |
Armin Ronacher | 7108207 | 2008-04-12 14:19:36 +0200 | [diff] [blame] | 245 | self.parse_signature(node) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 246 | node.body = self.parse_statements(('endmacro',), drop_needle=True) |
| 247 | return node |
| 248 | |
| 249 | def parse_print(self): |
| 250 | node = nodes.Output(lineno=self.stream.expect('print').lineno) |
| 251 | node.nodes = [] |
Armin Ronacher | f59bac2 | 2008-04-20 13:11:43 +0200 | [diff] [blame] | 252 | while self.stream.current.type not in statement_end_tokens: |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 253 | if node.nodes: |
| 254 | self.stream.expect('comma') |
| 255 | node.nodes.append(self.parse_expression()) |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 256 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 257 | |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 258 | def parse_expression(self, no_condexpr=False): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 259 | """Parse an expression.""" |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 260 | if no_condexpr: |
| 261 | return self.parse_or() |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 262 | return self.parse_condexpr() |
| 263 | |
| 264 | def parse_condexpr(self): |
| 265 | lineno = self.stream.current.lineno |
| 266 | expr1 = self.parse_or() |
| 267 | while self.stream.current.type is 'if': |
| 268 | self.stream.next() |
| 269 | expr2 = self.parse_or() |
| 270 | self.stream.expect('else') |
| 271 | expr3 = self.parse_condexpr() |
| 272 | expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno) |
| 273 | lineno = self.stream.current.lineno |
| 274 | return expr1 |
| 275 | |
| 276 | def parse_or(self): |
| 277 | lineno = self.stream.current.lineno |
| 278 | left = self.parse_and() |
| 279 | while self.stream.current.type is 'or': |
| 280 | self.stream.next() |
| 281 | right = self.parse_and() |
| 282 | left = nodes.Or(left, right, lineno=lineno) |
| 283 | lineno = self.stream.current.lineno |
| 284 | return left |
| 285 | |
| 286 | def parse_and(self): |
| 287 | lineno = self.stream.current.lineno |
| 288 | left = self.parse_compare() |
| 289 | while self.stream.current.type is 'and': |
| 290 | self.stream.next() |
| 291 | right = self.parse_compare() |
| 292 | left = nodes.And(left, right, lineno=lineno) |
| 293 | lineno = self.stream.current.lineno |
| 294 | return left |
| 295 | |
| 296 | def parse_compare(self): |
| 297 | lineno = self.stream.current.lineno |
| 298 | expr = self.parse_add() |
| 299 | ops = [] |
| 300 | while 1: |
| 301 | token_type = self.stream.current.type |
| 302 | if token_type in _compare_operators: |
| 303 | self.stream.next() |
| 304 | ops.append(nodes.Operand(token_type, self.parse_add())) |
| 305 | elif token_type is 'not' and self.stream.look().type is 'in': |
| 306 | self.stream.skip(2) |
| 307 | ops.append(nodes.Operand('notin', self.parse_add())) |
| 308 | else: |
| 309 | break |
| 310 | lineno = self.stream.current.lineno |
| 311 | if not ops: |
| 312 | return expr |
| 313 | return nodes.Compare(expr, ops, lineno=lineno) |
| 314 | |
| 315 | def parse_add(self): |
| 316 | lineno = self.stream.current.lineno |
| 317 | left = self.parse_sub() |
| 318 | while self.stream.current.type is 'add': |
| 319 | self.stream.next() |
| 320 | right = self.parse_sub() |
| 321 | left = nodes.Add(left, right, lineno=lineno) |
| 322 | lineno = self.stream.current.lineno |
| 323 | return left |
| 324 | |
| 325 | def parse_sub(self): |
| 326 | lineno = self.stream.current.lineno |
| 327 | left = self.parse_concat() |
| 328 | while self.stream.current.type is 'sub': |
| 329 | self.stream.next() |
| 330 | right = self.parse_concat() |
| 331 | left = nodes.Sub(left, right, lineno=lineno) |
| 332 | lineno = self.stream.current.lineno |
| 333 | return left |
| 334 | |
| 335 | def parse_concat(self): |
| 336 | lineno = self.stream.current.lineno |
| 337 | args = [self.parse_mul()] |
| 338 | while self.stream.current.type is 'tilde': |
| 339 | self.stream.next() |
| 340 | args.append(self.parse_mul()) |
| 341 | if len(args) == 1: |
| 342 | return args[0] |
| 343 | return nodes.Concat(args, lineno=lineno) |
| 344 | |
| 345 | def parse_mul(self): |
| 346 | lineno = self.stream.current.lineno |
| 347 | left = self.parse_div() |
| 348 | while self.stream.current.type is 'mul': |
| 349 | self.stream.next() |
| 350 | right = self.parse_div() |
| 351 | left = nodes.Mul(left, right, lineno=lineno) |
| 352 | lineno = self.stream.current.lineno |
| 353 | return left |
| 354 | |
| 355 | def parse_div(self): |
| 356 | lineno = self.stream.current.lineno |
| 357 | left = self.parse_floordiv() |
| 358 | while self.stream.current.type is 'div': |
| 359 | self.stream.next() |
| 360 | right = self.parse_floordiv() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 361 | left = nodes.Div(left, right, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 362 | lineno = self.stream.current.lineno |
| 363 | return left |
| 364 | |
| 365 | def parse_floordiv(self): |
| 366 | lineno = self.stream.current.lineno |
| 367 | left = self.parse_mod() |
| 368 | while self.stream.current.type is 'floordiv': |
| 369 | self.stream.next() |
| 370 | right = self.parse_mod() |
| 371 | left = nodes.FloorDiv(left, right, lineno=lineno) |
| 372 | lineno = self.stream.current.lineno |
| 373 | return left |
| 374 | |
| 375 | def parse_mod(self): |
| 376 | lineno = self.stream.current.lineno |
| 377 | left = self.parse_pow() |
| 378 | while self.stream.current.type is 'mod': |
| 379 | self.stream.next() |
| 380 | right = self.parse_pow() |
| 381 | left = nodes.Mod(left, right, lineno=lineno) |
| 382 | lineno = self.stream.current.lineno |
| 383 | return left |
| 384 | |
| 385 | def parse_pow(self): |
| 386 | lineno = self.stream.current.lineno |
| 387 | left = self.parse_unary() |
| 388 | while self.stream.current.type is 'pow': |
| 389 | self.stream.next() |
| 390 | right = self.parse_unary() |
| 391 | left = nodes.Pow(left, right, lineno=lineno) |
| 392 | lineno = self.stream.current.lineno |
| 393 | return left |
| 394 | |
| 395 | def parse_unary(self): |
| 396 | token_type = self.stream.current.type |
| 397 | lineno = self.stream.current.lineno |
| 398 | if token_type is 'not': |
| 399 | self.stream.next() |
| 400 | node = self.parse_unary() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 401 | return nodes.Not(node, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 402 | if token_type is 'sub': |
| 403 | self.stream.next() |
| 404 | node = self.parse_unary() |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 405 | return nodes.Neg(node, lineno=lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 406 | if token_type is 'add': |
| 407 | self.stream.next() |
| 408 | node = self.parse_unary() |
| 409 | return nodes.Pos(node, lineno=lineno) |
| 410 | return self.parse_primary() |
| 411 | |
| 412 | def parse_primary(self, parse_postfix=True): |
| 413 | token = self.stream.current |
| 414 | if token.type is 'name': |
| 415 | if token.value in ('true', 'false'): |
| 416 | node = nodes.Const(token.value == 'true', lineno=token.lineno) |
| 417 | elif token.value == 'none': |
| 418 | node = nodes.Const(None, lineno=token.lineno) |
| 419 | else: |
| 420 | node = nodes.Name(token.value, 'load', lineno=token.lineno) |
| 421 | self.stream.next() |
| 422 | elif token.type in ('integer', 'float', 'string'): |
| 423 | self.stream.next() |
| 424 | node = nodes.Const(token.value, lineno=token.lineno) |
| 425 | elif token.type is 'lparen': |
| 426 | self.stream.next() |
| 427 | node = self.parse_tuple() |
| 428 | self.stream.expect('rparen') |
| 429 | elif token.type is 'lbracket': |
| 430 | node = self.parse_list() |
| 431 | elif token.type is 'lbrace': |
| 432 | node = self.parse_dict() |
| 433 | else: |
| 434 | raise TemplateSyntaxError("unexpected token '%s'" % |
| 435 | (token,), token.lineno, |
| 436 | self.filename) |
| 437 | if parse_postfix: |
| 438 | node = self.parse_postfix(node) |
| 439 | return node |
| 440 | |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 441 | def parse_tuple(self, enforce=False, simplified=False, no_condexpr=False): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 442 | """ |
| 443 | Parse multiple expressions into a tuple. This can also return |
| 444 | just one expression which is not a tuple. If you want to enforce |
| 445 | a tuple, pass it enforce=True (currently unused). |
| 446 | """ |
| 447 | lineno = self.stream.current.lineno |
Armin Ronacher | 3d8b784 | 2008-04-13 13:16:50 +0200 | [diff] [blame] | 448 | if simplified: |
| 449 | parse = self.parse_primary |
| 450 | elif no_condexpr: |
| 451 | parse = lambda: self.parse_expression(no_condexpr=True) |
| 452 | else: |
| 453 | parse = self.parse_expression |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 454 | args = [] |
| 455 | is_tuple = False |
| 456 | while 1: |
| 457 | if args: |
| 458 | self.stream.expect('comma') |
Armin Ronacher | b5124e6 | 2008-04-25 00:36:14 +0200 | [diff] [blame] | 459 | if self.stream.current.type in _tuple_edge_tokens: |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 460 | break |
| 461 | args.append(parse()) |
Armin Ronacher | b5124e6 | 2008-04-25 00:36:14 +0200 | [diff] [blame] | 462 | if self.stream.current.type is 'comma': |
| 463 | is_tuple = True |
| 464 | else: |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 465 | break |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 466 | lineno = self.stream.current.lineno |
| 467 | if not is_tuple and args: |
| 468 | if enforce: |
| 469 | raise TemplateSyntaxError('tuple expected', lineno, |
| 470 | self.filename) |
| 471 | return args[0] |
| 472 | return nodes.Tuple(args, 'load', lineno=lineno) |
| 473 | |
| 474 | def parse_list(self): |
| 475 | token = self.stream.expect('lbracket') |
| 476 | items = [] |
| 477 | while self.stream.current.type is not 'rbracket': |
| 478 | if items: |
| 479 | self.stream.expect('comma') |
| 480 | if self.stream.current.type == 'rbracket': |
| 481 | break |
| 482 | items.append(self.parse_expression()) |
| 483 | self.stream.expect('rbracket') |
| 484 | return nodes.List(items, lineno=token.lineno) |
| 485 | |
| 486 | def parse_dict(self): |
| 487 | token = self.stream.expect('lbrace') |
| 488 | items = [] |
| 489 | while self.stream.current.type is not 'rbrace': |
| 490 | if items: |
| 491 | self.stream.expect('comma') |
| 492 | if self.stream.current.type == 'rbrace': |
| 493 | break |
| 494 | key = self.parse_expression() |
| 495 | self.stream.expect('colon') |
| 496 | value = self.parse_expression() |
| 497 | items.append(nodes.Pair(key, value, lineno=key.lineno)) |
| 498 | self.stream.expect('rbrace') |
Armin Ronacher | be4ae24 | 2008-04-18 09:49:08 +0200 | [diff] [blame] | 499 | return nodes.Dict(items, lineno=token.lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 500 | |
| 501 | def parse_postfix(self, node): |
| 502 | while 1: |
| 503 | token_type = self.stream.current.type |
| 504 | if token_type is 'dot' or token_type is 'lbracket': |
| 505 | node = self.parse_subscript(node) |
| 506 | elif token_type is 'lparen': |
| 507 | node = self.parse_call(node) |
| 508 | elif token_type is 'pipe': |
| 509 | node = self.parse_filter(node) |
| 510 | elif token_type is 'is': |
| 511 | node = self.parse_test(node) |
| 512 | else: |
| 513 | break |
| 514 | return node |
| 515 | |
| 516 | def parse_subscript(self, node): |
| 517 | token = self.stream.next() |
| 518 | if token.type is 'dot': |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 519 | attr_token = self.stream.current |
| 520 | if attr_token.type not in ('name', 'integer'): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 521 | raise TemplateSyntaxError('expected name or number', |
Armin Ronacher | e791c2a | 2008-04-07 18:39:54 +0200 | [diff] [blame] | 522 | attr_token.lineno, self.filename) |
| 523 | arg = nodes.Const(attr_token.value, lineno=attr_token.lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 524 | self.stream.next() |
| 525 | elif token.type is 'lbracket': |
| 526 | args = [] |
| 527 | while self.stream.current.type is not 'rbracket': |
| 528 | if args: |
| 529 | self.stream.expect('comma') |
| 530 | args.append(self.parse_subscribed()) |
| 531 | self.stream.expect('rbracket') |
| 532 | if len(args) == 1: |
| 533 | arg = args[0] |
| 534 | else: |
| 535 | arg = nodes.Tuple(args, lineno, self.filename) |
| 536 | else: |
| 537 | raise TemplateSyntaxError('expected subscript expression', |
| 538 | self.lineno, self.filename) |
| 539 | return nodes.Subscript(node, arg, 'load', lineno=token.lineno) |
| 540 | |
| 541 | def parse_subscribed(self): |
| 542 | lineno = self.stream.current.lineno |
| 543 | |
| 544 | if self.stream.current.type is 'colon': |
| 545 | self.stream.next() |
| 546 | args = [None] |
| 547 | else: |
| 548 | node = self.parse_expression() |
| 549 | if self.stream.current.type is not 'colon': |
| 550 | return node |
| 551 | self.stream.next() |
| 552 | args = [node] |
| 553 | |
| 554 | if self.stream.current.type is 'colon': |
| 555 | args.append(None) |
| 556 | elif self.stream.current.type not in ('rbracket', 'comma'): |
| 557 | args.append(self.parse_expression()) |
| 558 | else: |
| 559 | args.append(None) |
| 560 | |
| 561 | if self.stream.current.type is 'colon': |
| 562 | self.stream.next() |
| 563 | if self.stream.current.type not in ('rbracket', 'comma'): |
| 564 | args.append(self.parse_expression()) |
| 565 | else: |
| 566 | args.append(None) |
| 567 | else: |
| 568 | args.append(None) |
| 569 | |
| 570 | return nodes.Slice(lineno=lineno, *args) |
| 571 | |
| 572 | def parse_call(self, node): |
| 573 | token = self.stream.expect('lparen') |
| 574 | args = [] |
| 575 | kwargs = [] |
| 576 | dyn_args = dyn_kwargs = None |
| 577 | require_comma = False |
| 578 | |
| 579 | def ensure(expr): |
| 580 | if not expr: |
| 581 | raise TemplateSyntaxError('invalid syntax for function ' |
| 582 | 'call expression', token.lineno, |
| 583 | self.filename) |
| 584 | |
| 585 | while self.stream.current.type is not 'rparen': |
| 586 | if require_comma: |
| 587 | self.stream.expect('comma') |
| 588 | # support for trailing comma |
| 589 | if self.stream.current.type is 'rparen': |
| 590 | break |
| 591 | if self.stream.current.type is 'mul': |
| 592 | ensure(dyn_args is None and dyn_kwargs is None) |
| 593 | self.stream.next() |
| 594 | dyn_args = self.parse_expression() |
| 595 | elif self.stream.current.type is 'pow': |
| 596 | ensure(dyn_kwargs is None) |
| 597 | self.stream.next() |
| 598 | dyn_kwargs = self.parse_expression() |
| 599 | else: |
| 600 | ensure(dyn_args is None and dyn_kwargs is None) |
| 601 | if self.stream.current.type is 'name' and \ |
| 602 | self.stream.look().type is 'assign': |
| 603 | key = self.stream.current.value |
| 604 | self.stream.skip(2) |
Armin Ronacher | 0611e49 | 2008-04-25 23:44:14 +0200 | [diff] [blame] | 605 | value = self.parse_expression() |
| 606 | kwargs.append(nodes.Keyword(key, value, |
| 607 | lineno=value.lineno)) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 608 | else: |
| 609 | ensure(not kwargs) |
| 610 | args.append(self.parse_expression()) |
| 611 | |
| 612 | require_comma = True |
| 613 | self.stream.expect('rparen') |
| 614 | |
| 615 | if node is None: |
| 616 | return args, kwargs, dyn_args, dyn_kwargs |
| 617 | return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, |
| 618 | lineno=token.lineno) |
| 619 | |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 620 | def parse_filter(self, node, start_inline=False): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 621 | lineno = self.stream.current.type |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 622 | while self.stream.current.type == 'pipe' or start_inline: |
| 623 | if not start_inline: |
| 624 | self.stream.next() |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 625 | token = self.stream.expect('name') |
| 626 | if self.stream.current.type is 'lparen': |
| 627 | args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) |
| 628 | else: |
| 629 | args = [] |
| 630 | kwargs = [] |
| 631 | dyn_args = dyn_kwargs = None |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 632 | node = nodes.Filter(node, token.value, args, kwargs, dyn_args, |
| 633 | dyn_kwargs, lineno=token.lineno) |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 634 | start_inline = False |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 635 | return node |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 636 | |
| 637 | def parse_test(self, node): |
| 638 | token = self.stream.expect('is') |
| 639 | if self.stream.current.type is 'not': |
| 640 | self.stream.next() |
| 641 | negated = True |
| 642 | else: |
| 643 | negated = False |
| 644 | name = self.stream.expect('name').value |
Armin Ronacher | 10f3ba2 | 2008-04-18 11:30:37 +0200 | [diff] [blame] | 645 | dyn_args = dyn_kwargs = None |
| 646 | kwargs = [] |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 647 | if self.stream.current.type is 'lparen': |
| 648 | args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) |
| 649 | elif self.stream.current.type in ('name', 'string', 'integer', |
| 650 | 'float', 'lparen', 'lbracket', |
| 651 | 'lbrace', 'regex'): |
| 652 | args = [self.parse_expression()] |
| 653 | else: |
| 654 | args = [] |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 655 | node = nodes.Test(node, name, args, kwargs, dyn_args, |
| 656 | dyn_kwargs, lineno=token.lineno) |
| 657 | if negated: |
Armin Ronacher | 9a82205 | 2008-04-17 18:44:07 +0200 | [diff] [blame] | 658 | node = nodes.Not(node, lineno=token.lineno) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 659 | return node |
| 660 | |
| 661 | def subparse(self, end_tokens=None): |
| 662 | body = [] |
| 663 | data_buffer = [] |
| 664 | add_data = data_buffer.append |
| 665 | |
| 666 | def flush_data(): |
| 667 | if data_buffer: |
| 668 | lineno = data_buffer[0].lineno |
| 669 | body.append(nodes.Output(data_buffer[:], lineno=lineno)) |
| 670 | del data_buffer[:] |
| 671 | |
| 672 | while self.stream: |
| 673 | token = self.stream.current |
| 674 | if token.type is 'data': |
Armin Ronacher | fa865fb | 2008-04-12 22:11:53 +0200 | [diff] [blame] | 675 | if token.value: |
| 676 | add_data(nodes.Const(token.value, lineno=token.lineno)) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 677 | self.stream.next() |
| 678 | elif token.type is 'variable_begin': |
| 679 | self.stream.next() |
Armin Ronacher | b5124e6 | 2008-04-25 00:36:14 +0200 | [diff] [blame] | 680 | add_data(self.parse_tuple()) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 681 | self.stream.expect('variable_end') |
| 682 | elif token.type is 'block_begin': |
| 683 | flush_data() |
| 684 | self.stream.next() |
| 685 | if end_tokens is not None and \ |
Armin Ronacher | f59bac2 | 2008-04-20 13:11:43 +0200 | [diff] [blame] | 686 | self.stream.current.test_many(end_tokens): |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 687 | return body |
Armin Ronacher | 32a910f | 2008-04-26 23:21:03 +0200 | [diff] [blame^] | 688 | body.append(self.parse_statement()) |
Armin Ronacher | 82b3f3d | 2008-03-31 20:01:08 +0200 | [diff] [blame] | 689 | self.stream.expect('block_end') |
| 690 | else: |
| 691 | raise AssertionError('internal parsing error') |
| 692 | |
| 693 | flush_data() |
| 694 | return body |
| 695 | |
| 696 | def parse(self): |
| 697 | """Parse the whole template into a `Template` node.""" |
Armin Ronacher | d55ab53 | 2008-04-09 16:13:39 +0200 | [diff] [blame] | 698 | result = nodes.Template(self.subparse(), lineno=1) |
| 699 | result.set_environment(self.environment) |
| 700 | return result |