Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 814 insertions, 0 deletions

diff --git a/meson/mesonbuild/mparser.py b/meson/mesonbuild/mparser.py
new file mode 100644
index 000000000..10796827c
--- /dev/null
+++ b/meson/mesonbuild/mparser.py
@@ -0,0 +1,814 @@
+# Copyright 2014-2017 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import re
+import codecs
+import textwrap
+import types
+import typing as T
+from .mesonlib import MesonException
+from . import mlog
+
+if T.TYPE_CHECKING:
+    from .ast import AstVisitor
+
+# This is the regex for the supported escape sequences of a regular string
+# literal, like 'abc\x00'
+ESCAPE_SEQUENCE_SINGLE_RE = re.compile(r'''
+    ( \\U[A-Fa-f0-9]{8}   # 8-digit hex escapes
+    | \\u[A-Fa-f0-9]{4}   # 4-digit hex escapes
+    | \\x[A-Fa-f0-9]{2}   # 2-digit hex escapes
+    | \\[0-7]{1,3}        # Octal escapes
+    | \\N\{[^}]+\}        # Unicode characters by name
+    | \\[\\'abfnrtv]      # Single-character escapes
+    )''', re.UNICODE | re.VERBOSE)
+
+class MesonUnicodeDecodeError(MesonException):
+    def __init__(self, match: str) -> None:
+        super().__init__(match)
+        self.match = match
+
+def decode_match(match: T.Match[str]) -> str:
+    try:
+        return codecs.decode(match.group(0).encode(), 'unicode_escape')
+    except UnicodeDecodeError:
+        raise MesonUnicodeDecodeError(match.group(0))
+
+class ParseException(MesonException):
+    def __init__(self, text: str, line: str, lineno: int, colno: int) -> None:
+        # Format as error message, followed by the line with the error, followed by a caret to show the error column.
+        super().__init__("{}\n{}\n{}".format(text, line, '{}^'.format(' ' * colno)))
+        self.lineno = lineno
+        self.colno = colno
+
+class BlockParseException(MesonException):
+    def __init__(
+                self,
+                text: str,
+                line: str,
+                lineno: int,
+                colno: int,
+                start_line: str,
+                start_lineno: int,
+                start_colno: int,
+            ) -> None:
+        # This can be formatted in two ways - one if the block start and end are on the same line, and a different way if they are on different lines.
+
+        if lineno == start_lineno:
+            # If block start and end are on the same line, it is formatted as:
+            # Error message
+            # Followed by the line with the error
+            # Followed by a caret to show the block start
+            # Followed by underscores
+            # Followed by a caret to show the block end.
+            super().__init__("{}\n{}\n{}".format(text, line, '{}^{}^'.format(' ' * start_colno, '_' * (colno - start_colno - 1))))
+        else:
+            # If block start and end are on different lines, it is formatted as:
+            # Error message
+            # Followed by the line with the error
+            # Followed by a caret to show the error column.
+            # Followed by a message saying where the block started.
+            # Followed by the line of the block start.
+            # Followed by a caret for the block start.
+            super().__init__("%s\n%s\n%s\nFor a block that started at %d,%d\n%s\n%s" % (text, line, '%s^' % (' ' * colno), start_lineno, start_colno, start_line, "%s^" % (' ' * start_colno)))
+        self.lineno = lineno
+        self.colno = colno
+
+TV_TokenTypes = T.TypeVar('TV_TokenTypes', int, str, bool)
+
+class Token(T.Generic[TV_TokenTypes]):
+    def __init__(self, tid: str, filename: str, line_start: int, lineno: int, colno: int, bytespan: T.Tuple[int, int], value: TV_TokenTypes):
+        self.tid = tid                # type: str
+        self.filename = filename      # type: str
+        self.line_start = line_start  # type: int
+        self.lineno = lineno          # type: int
+        self.colno = colno            # type: int
+        self.bytespan = bytespan      # type: T.Tuple[int, int]
+        self.value = value            # type: TV_TokenTypes
+
+    def __eq__(self, other: object) -> bool:
+        if isinstance(other, str):
+            return self.tid == other
+        elif isinstance(other, Token):
+            return self.tid == other.tid
+        return NotImplemented
+
+class Lexer:
+    def __init__(self, code: str):
+        self.code = code
+        self.keywords = {'true', 'false', 'if', 'else', 'elif',
+                         'endif', 'and', 'or', 'not', 'foreach', 'endforeach',
+                         'in', 'continue', 'break'}
+        self.future_keywords = {'return'}
+        self.token_specification = [
+            # Need to be sorted longest to shortest.
+            ('ignore', re.compile(r'[ \t]')),
+            ('fstring', re.compile(r"f'([^'\\]|(\\.))*'")),
+            ('id', re.compile('[_a-zA-Z][_0-9a-zA-Z]*')),
+            ('number', re.compile(r'0[bB][01]+|0[oO][0-7]+|0[xX][0-9a-fA-F]+|0|[1-9]\d*')),
+            ('eol_cont', re.compile(r'\\\n')),
+            ('eol', re.compile(r'\n')),
+            ('multiline_string', re.compile(r"'''(.|\n)*?'''", re.M)),
+            ('comment', re.compile(r'#.*')),
+            ('lparen', re.compile(r'\(')),
+            ('rparen', re.compile(r'\)')),
+            ('lbracket', re.compile(r'\[')),
+            ('rbracket', re.compile(r'\]')),
+            ('lcurl', re.compile(r'\{')),
+            ('rcurl', re.compile(r'\}')),
+            ('dblquote', re.compile(r'"')),
+            ('string', re.compile(r"'([^'\\]|(\\.))*'")),
+            ('comma', re.compile(r',')),
+            ('plusassign', re.compile(r'\+=')),
+            ('dot', re.compile(r'\.')),
+            ('plus', re.compile(r'\+')),
+            ('dash', re.compile(r'-')),
+            ('star', re.compile(r'\*')),
+            ('percent', re.compile(r'%')),
+            ('fslash', re.compile(r'/')),
+            ('colon', re.compile(r':')),
+            ('equal', re.compile(r'==')),
+            ('nequal', re.compile(r'!=')),
+            ('assign', re.compile(r'=')),
+            ('le', re.compile(r'<=')),
+            ('lt', re.compile(r'<')),
+            ('ge', re.compile(r'>=')),
+            ('gt', re.compile(r'>')),
+            ('questionmark', re.compile(r'\?')),
+        ]
+
+    def getline(self, line_start: int) -> str:
+        return self.code[line_start:self.code.find('\n', line_start)]
+
+    def lex(self, filename: str) -> T.Generator[Token, None, None]:
+        line_start = 0
+        lineno = 1
+        loc = 0
+        par_count = 0
+        bracket_count = 0
+        curl_count = 0
+        col = 0
+        while loc < len(self.code):
+            matched = False
+            value = None  # type: T.Union[str, bool, int]
+            for (tid, reg) in self.token_specification:
+                mo = reg.match(self.code, loc)
+                if mo:
+                    curline = lineno
+                    curline_start = line_start
+                    col = mo.start() - line_start
+                    matched = True
+                    span_start = loc
+                    loc = mo.end()
+                    span_end = loc
+                    bytespan = (span_start, span_end)
+                    match_text = mo.group()
+                    if tid == 'ignore' or tid == 'comment':
+                        break
+                    elif tid == 'lparen':
+                        par_count += 1
+                    elif tid == 'rparen':
+                        par_count -= 1
+                    elif tid == 'lbracket':
+                        bracket_count += 1
+                    elif tid == 'rbracket':
+                        bracket_count -= 1
+                    elif tid == 'lcurl':
+                        curl_count += 1
+                    elif tid == 'rcurl':
+                        curl_count -= 1
+                    elif tid == 'dblquote':
+                        raise ParseException('Double quotes are not supported. Use single quotes.', self.getline(line_start), lineno, col)
+                    elif tid in {'string', 'fstring'}:
+                        # Handle here and not on the regexp to give a better error message.
+                        if match_text.find("\n") != -1:
+                            mlog.warning(textwrap.dedent("""\
+                                    Newline character in a string detected, use ''' (three single quotes) for multiline strings instead.
+                                    This will become a hard error in a future Meson release.\
+                                """),
+                                self.getline(line_start),
+                                str(lineno),
+                                str(col)
+                            )
+                        value = match_text[2 if tid == 'fstring' else 1:-1]
+                        try:
+                            value = ESCAPE_SEQUENCE_SINGLE_RE.sub(decode_match, value)
+                        except MesonUnicodeDecodeError as err:
+                            raise MesonException(f"Failed to parse escape sequence: '{err.match}' in string:\n  {match_text}")
+                    elif tid == 'multiline_string':
+                        tid = 'string'
+                        value = match_text[3:-3]
+                        lines = match_text.split('\n')
+                        if len(lines) > 1:
+                            lineno += len(lines) - 1
+                            line_start = mo.end() - len(lines[-1])
+                    elif tid == 'number':
+                        value = int(match_text, base=0)
+                    elif tid == 'eol_cont':
+                        lineno += 1
+                        line_start = loc
+                        break
+                    elif tid == 'eol':
+                        lineno += 1
+                        line_start = loc
+                        if par_count > 0 or bracket_count > 0 or curl_count > 0:
+                            break
+                    elif tid == 'id':
+                        if match_text in self.keywords:
+                            tid = match_text
+                        else:
+                            if match_text in self.future_keywords:
+                                mlog.warning(f"Identifier '{match_text}' will become a reserved keyword in a future release. Please rename it.",
+                                             location=types.SimpleNamespace(filename=filename, lineno=lineno))
+                            value = match_text
+                    yield Token(tid, filename, curline_start, curline, col, bytespan, value)
+                    break
+            if not matched:
+                raise ParseException('lexer', self.getline(line_start), lineno, col)
+
+class BaseNode:
+    def __init__(self, lineno: int, colno: int, filename: str, end_lineno: T.Optional[int] = None, end_colno: T.Optional[int] = None):
+        self.lineno = lineno      # type: int
+        self.colno = colno        # type: int
+        self.filename = filename  # type: str
+        self.end_lineno = end_lineno if end_lineno is not None else self.lineno
+        self.end_colno = end_colno if end_colno is not None else self.colno
+
+        # Attributes for the visitors
+        self.level = 0            # type: int
+        self.ast_id = ''          # type: str
+        self.condition_level = 0  # type: int
+
+    def accept(self, visitor: 'AstVisitor') -> None:
+        fname = 'visit_{}'.format(type(self).__name__)
+        if hasattr(visitor, fname):
+            func = getattr(visitor, fname)
+            if callable(func):
+                func(self)
+
+class ElementaryNode(T.Generic[TV_TokenTypes], BaseNode):
+    def __init__(self, token: Token[TV_TokenTypes]):
+        super().__init__(token.lineno, token.colno, token.filename)
+        self.value = token.value        # type: TV_TokenTypes
+        self.bytespan = token.bytespan  # type: T.Tuple[int, int]
+
+class BooleanNode(ElementaryNode[bool]):
+    def __init__(self, token: Token[bool]):
+        super().__init__(token)
+        assert isinstance(self.value, bool)
+
+class IdNode(ElementaryNode[str]):
+    def __init__(self, token: Token[str]):
+        super().__init__(token)
+        assert isinstance(self.value, str)
+
+    def __str__(self) -> str:
+        return "Id node: '%s' (%d, %d)." % (self.value, self.lineno, self.colno)
+
+class NumberNode(ElementaryNode[int]):
+    def __init__(self, token: Token[int]):
+        super().__init__(token)
+        assert isinstance(self.value, int)
+
+class StringNode(ElementaryNode[str]):
+    def __init__(self, token: Token[str]):
+        super().__init__(token)
+        assert isinstance(self.value, str)
+
+    def __str__(self) -> str:
+        return "String node: '%s' (%d, %d)." % (self.value, self.lineno, self.colno)
+
+class FormatStringNode(ElementaryNode[str]):
+    def __init__(self, token: Token[str]):
+        super().__init__(token)
+        assert isinstance(self.value, str)
+
+    def __str__(self) -> str:
+        return "Format string node: '{self.value}' ({self.lineno}, {self.colno})."
+
+class ContinueNode(ElementaryNode):
+    pass
+
+class BreakNode(ElementaryNode):
+    pass
+
+class ArgumentNode(BaseNode):
+    def __init__(self, token: Token[TV_TokenTypes]):
+        super().__init__(token.lineno, token.colno, token.filename)
+        self.arguments = []  # type: T.List[BaseNode]
+        self.commas = []     # type: T.List[Token[TV_TokenTypes]]
+        self.kwargs = {}     # type: T.Dict[BaseNode, BaseNode]
+        self.order_error = False
+
+    def prepend(self, statement: BaseNode) -> None:
+        if self.num_kwargs() > 0:
+            self.order_error = True
+        if not isinstance(statement, EmptyNode):
+            self.arguments = [statement] + self.arguments
+
+    def append(self, statement: BaseNode) -> None:
+        if self.num_kwargs() > 0:
+            self.order_error = True
+        if not isinstance(statement, EmptyNode):
+            self.arguments += [statement]
+
+    def set_kwarg(self, name: IdNode, value: BaseNode) -> None:
+        if name.value in [x.value for x in self.kwargs.keys() if isinstance(x, IdNode)]:
+            mlog.warning(f'Keyword argument "{name.value}" defined multiple times.', location=self)
+            mlog.warning('This will be an error in future Meson releases.')
+        self.kwargs[name] = value
+
+    def set_kwarg_no_check(self, name: BaseNode, value: BaseNode) -> None:
+        self.kwargs[name] = value
+
+    def num_args(self) -> int:
+        return len(self.arguments)
+
+    def num_kwargs(self) -> int:
+        return len(self.kwargs)
+
+    def incorrect_order(self) -> bool:
+        return self.order_error
+
+    def __len__(self) -> int:
+        return self.num_args() # Fixme
+
+class ArrayNode(BaseNode):
+    def __init__(self, args: ArgumentNode, lineno: int, colno: int, end_lineno: int, end_colno: int):
+        super().__init__(lineno, colno, args.filename, end_lineno=end_lineno, end_colno=end_colno)
+        self.args = args              # type: ArgumentNode
+
+class DictNode(BaseNode):
+    def __init__(self, args: ArgumentNode, lineno: int, colno: int, end_lineno: int, end_colno: int):
+        super().__init__(lineno, colno, args.filename, end_lineno=end_lineno, end_colno=end_colno)
+        self.args = args
+
+class EmptyNode(BaseNode):
+    def __init__(self, lineno: int, colno: int, filename: str):
+        super().__init__(lineno, colno, filename)
+        self.value = None
+
+class OrNode(BaseNode):
+    def __init__(self, left: BaseNode, right: BaseNode):
+        super().__init__(left.lineno, left.colno, left.filename)
+        self.left = left    # type: BaseNode
+        self.right = right  # type: BaseNode
+
+class AndNode(BaseNode):
+    def __init__(self, left: BaseNode, right: BaseNode):
+        super().__init__(left.lineno, left.colno, left.filename)
+        self.left = left    # type: BaseNode
+        self.right = right  # type: BaseNode
+
+class ComparisonNode(BaseNode):
+    def __init__(self, ctype: str, left: BaseNode, right: BaseNode):
+        super().__init__(left.lineno, left.colno, left.filename)
+        self.left = left    # type: BaseNode
+        self.right = right  # type: BaseNode
+        self.ctype = ctype  # type: str
+
+class ArithmeticNode(BaseNode):
+    def __init__(self, operation: str, left: BaseNode, right: BaseNode):
+        super().__init__(left.lineno, left.colno, left.filename)
+        self.left = left            # type: BaseNode
+        self.right = right          # type: BaseNode
+        self.operation = operation  # type: str
+
+class NotNode(BaseNode):
+    def __init__(self, token: Token[TV_TokenTypes], value: BaseNode):
+        super().__init__(token.lineno, token.colno, token.filename)
+        self.value = value  # type: BaseNode
+
+class CodeBlockNode(BaseNode):
+    def __init__(self, token: Token[TV_TokenTypes]):
+        super().__init__(token.lineno, token.colno, token.filename)
+        self.lines = []  # type: T.List[BaseNode]
+
+class IndexNode(BaseNode):
+    def __init__(self, iobject: BaseNode, index: BaseNode):
+        super().__init__(iobject.lineno, iobject.colno, iobject.filename)
+        self.iobject = iobject  # type: BaseNode
+        self.index = index      # type: BaseNode
+
+class MethodNode(BaseNode):
+    def __init__(self, filename: str, lineno: int, colno: int, source_object: BaseNode, name: str, args: ArgumentNode):
+        super().__init__(lineno, colno, filename)
+        self.source_object = source_object  # type: BaseNode
+        self.name = name                    # type: str
+        assert(isinstance(self.name, str))
+        self.args = args                    # type: ArgumentNode
+
+class FunctionNode(BaseNode):
+    def __init__(self, filename: str, lineno: int, colno: int, end_lineno: int, end_colno: int, func_name: str, args: ArgumentNode):
+        super().__init__(lineno, colno, filename, end_lineno=end_lineno, end_colno=end_colno)
+        self.func_name = func_name  # type: str
+        assert(isinstance(func_name, str))
+        self.args = args  # type: ArgumentNode
+
+class AssignmentNode(BaseNode):
+    def __init__(self, filename: str, lineno: int, colno: int, var_name: str, value: BaseNode):
+        super().__init__(lineno, colno, filename)
+        self.var_name = var_name  # type: str
+        assert(isinstance(var_name, str))
+        self.value = value  # type: BaseNode
+
+class PlusAssignmentNode(BaseNode):
+    def __init__(self, filename: str, lineno: int, colno: int, var_name: str, value: BaseNode):
+        super().__init__(lineno, colno, filename)
+        self.var_name = var_name  # type: str
+        assert(isinstance(var_name, str))
+        self.value = value  # type: BaseNode
+
+class ForeachClauseNode(BaseNode):
+    def __init__(self, token: Token, varnames: T.List[str], items: BaseNode, block: CodeBlockNode):
+        super().__init__(token.lineno, token.colno, token.filename)
+        self.varnames = varnames  # type: T.List[str]
+        self.items = items        # type: BaseNode
+        self.block = block        # type: CodeBlockNode
+
+class IfNode(BaseNode):
+    def __init__(self, linenode: BaseNode, condition: BaseNode, block: CodeBlockNode):
+        super().__init__(linenode.lineno, linenode.colno, linenode.filename)
+        self.condition = condition  # type: BaseNode
+        self.block = block          # type: CodeBlockNode
+
+class IfClauseNode(BaseNode):
+    def __init__(self, linenode: BaseNode):
+        super().__init__(linenode.lineno, linenode.colno, linenode.filename)
+        self.ifs = []          # type: T.List[IfNode]
+        self.elseblock = None  # type: T.Union[EmptyNode, CodeBlockNode]
+
+class UMinusNode(BaseNode):
+    def __init__(self, current_location: Token, value: BaseNode):
+        super().__init__(current_location.lineno, current_location.colno, current_location.filename)
+        self.value = value  # type: BaseNode
+
+class TernaryNode(BaseNode):
+    def __init__(self, condition: BaseNode, trueblock: BaseNode, falseblock: BaseNode):
+        super().__init__(condition.lineno, condition.colno, condition.filename)
+        self.condition = condition    # type: BaseNode
+        self.trueblock = trueblock    # type: BaseNode
+        self.falseblock = falseblock  # type: BaseNode
+
+comparison_map = {'equal': '==',
+                  'nequal': '!=',
+                  'lt': '<',
+                  'le': '<=',
+                  'gt': '>',
+                  'ge': '>=',
+                  'in': 'in',
+                  'notin': 'not in',
+                  }
+
+# Recursive descent parser for Meson's definition language.
+# Very basic apart from the fact that we have many precedence
+# levels so there are not enough words to describe them all.
+# Enter numbering:
+#
+# 1 assignment
+# 2 or
+# 3 and
+# 4 comparison
+# 5 arithmetic
+# 6 negation
+# 7 funcall, method call
+# 8 parentheses
+# 9 plain token
+
+class Parser:
+    def __init__(self, code: str, filename: str):
+        self.lexer = Lexer(code)
+        self.stream = self.lexer.lex(filename)
+        self.current = Token('eof', '', 0, 0, 0, (0, 0), None)  # type: Token
+        self.getsym()
+        self.in_ternary = False
+
+    def getsym(self) -> None:
+        try:
+            self.current = next(self.stream)
+        except StopIteration:
+            self.current = Token('eof', '', self.current.line_start, self.current.lineno, self.current.colno + self.current.bytespan[1] - self.current.bytespan[0], (0, 0), None)
+
+    def getline(self) -> str:
+        return self.lexer.getline(self.current.line_start)
+
+    def accept(self, s: str) -> bool:
+        if self.current.tid == s:
+            self.getsym()
+            return True
+        return False
+
+    def accept_any(self, tids: T.Sequence[str]) -> str:
+        tid = self.current.tid
+        if tid in tids:
+            self.getsym()
+            return tid
+        return ''
+
+    def expect(self, s: str) -> bool:
+        if self.accept(s):
+            return True
+        raise ParseException(f'Expecting {s} got {self.current.tid}.', self.getline(), self.current.lineno, self.current.colno)
+
+    def block_expect(self, s: str, block_start: Token) -> bool:
+        if self.accept(s):
+            return True
+        raise BlockParseException(f'Expecting {s} got {self.current.tid}.', self.getline(), self.current.lineno, self.current.colno, self.lexer.getline(block_start.line_start), block_start.lineno, block_start.colno)
+
+    def parse(self) -> CodeBlockNode:
+        block = self.codeblock()
+        self.expect('eof')
+        return block
+
+    def statement(self) -> BaseNode:
+        return self.e1()
+
+    def e1(self) -> BaseNode:
+        left = self.e2()
+        if self.accept('plusassign'):
+            value = self.e1()
+            if not isinstance(left, IdNode):
+                raise ParseException('Plusassignment target must be an id.', self.getline(), left.lineno, left.colno)
+            assert isinstance(left.value, str)
+            return PlusAssignmentNode(left.filename, left.lineno, left.colno, left.value, value)
+        elif self.accept('assign'):
+            value = self.e1()
+            if not isinstance(left, IdNode):
+                raise ParseException('Assignment target must be an id.',
+                                     self.getline(), left.lineno, left.colno)
+            assert isinstance(left.value, str)
+            return AssignmentNode(left.filename, left.lineno, left.colno, left.value, value)
+        elif self.accept('questionmark'):
+            if self.in_ternary:
+                raise ParseException('Nested ternary operators are not allowed.',
+                                     self.getline(), left.lineno, left.colno)
+            self.in_ternary = True
+            trueblock = self.e1()
+            self.expect('colon')
+            falseblock = self.e1()
+            self.in_ternary = False
+            return TernaryNode(left, trueblock, falseblock)
+        return left
+
+    def e2(self) -> BaseNode:
+        left = self.e3()
+        while self.accept('or'):
+            if isinstance(left, EmptyNode):
+                raise ParseException('Invalid or clause.',
+                                     self.getline(), left.lineno, left.colno)
+            left = OrNode(left, self.e3())
+        return left
+
+    def e3(self) -> BaseNode:
+        left = self.e4()
+        while self.accept('and'):
+            if isinstance(left, EmptyNode):
+                raise ParseException('Invalid and clause.',
+                                     self.getline(), left.lineno, left.colno)
+            left = AndNode(left, self.e4())
+        return left
+
+    def e4(self) -> BaseNode:
+        left = self.e5()
+        for nodename, operator_type in comparison_map.items():
+            if self.accept(nodename):
+                return ComparisonNode(operator_type, left, self.e5())
+        if self.accept('not') and self.accept('in'):
+            return ComparisonNode('notin', left, self.e5())
+        return left
+
+    def e5(self) -> BaseNode:
+        return self.e5addsub()
+
+    def e5addsub(self) -> BaseNode:
+        op_map = {
+            'plus': 'add',
+            'dash': 'sub',
+        }
+        left = self.e5muldiv()
+        while True:
+            op = self.accept_any(tuple(op_map.keys()))
+            if op:
+                left = ArithmeticNode(op_map[op], left, self.e5muldiv())
+            else:
+                break
+        return left
+
+    def e5muldiv(self) -> BaseNode:
+        op_map = {
+            'percent': 'mod',
+            'star': 'mul',
+            'fslash': 'div',
+        }
+        left = self.e6()
+        while True:
+            op = self.accept_any(tuple(op_map.keys()))
+            if op:
+                left = ArithmeticNode(op_map[op], left, self.e6())
+            else:
+                break
+        return left
+
+    def e6(self) -> BaseNode:
+        if self.accept('not'):
+            return NotNode(self.current, self.e7())
+        if self.accept('dash'):
+            return UMinusNode(self.current, self.e7())
+        return self.e7()
+
+    def e7(self) -> BaseNode:
+        left = self.e8()
+        block_start = self.current
+        if self.accept('lparen'):
+            args = self.args()
+            self.block_expect('rparen', block_start)
+            if not isinstance(left, IdNode):
+                raise ParseException('Function call must be applied to plain id',
+                                     self.getline(), left.lineno, left.colno)
+            assert isinstance(left.value, str)
+            left = FunctionNode(left.filename, left.lineno, left.colno, self.current.lineno, self.current.colno, left.value, args)
+        go_again = True
+        while go_again:
+            go_again = False
+            if self.accept('dot'):
+                go_again = True
+                left = self.method_call(left)
+            if self.accept('lbracket'):
+                go_again = True
+                left = self.index_call(left)
+        return left
+
+    def e8(self) -> BaseNode:
+        block_start = self.current
+        if self.accept('lparen'):
+            e = self.statement()
+            self.block_expect('rparen', block_start)
+            return e
+        elif self.accept('lbracket'):
+            args = self.args()
+            self.block_expect('rbracket', block_start)
+            return ArrayNode(args, block_start.lineno, block_start.colno, self.current.lineno, self.current.colno)
+        elif self.accept('lcurl'):
+            key_values = self.key_values()
+            self.block_expect('rcurl', block_start)
+            return DictNode(key_values, block_start.lineno, block_start.colno, self.current.lineno, self.current.colno)
+        else:
+            return self.e9()
+
+    def e9(self) -> BaseNode:
+        t = self.current
+        if self.accept('true'):
+            t.value = True
+            return BooleanNode(t)
+        if self.accept('false'):
+            t.value = False
+            return BooleanNode(t)
+        if self.accept('id'):
+            return IdNode(t)
+        if self.accept('number'):
+            return NumberNode(t)
+        if self.accept('string'):
+            return StringNode(t)
+        if self.accept('fstring'):
+            return FormatStringNode(t)
+        return EmptyNode(self.current.lineno, self.current.colno, self.current.filename)
+
+    def key_values(self) -> ArgumentNode:
+        s = self.statement()  # type: BaseNode
+        a = ArgumentNode(self.current)
+
+        while not isinstance(s, EmptyNode):
+            if self.accept('colon'):
+                a.set_kwarg_no_check(s, self.statement())
+                potential = self.current
+                if not self.accept('comma'):
+                    return a
+                a.commas.append(potential)
+            else:
+                raise ParseException('Only key:value pairs are valid in dict construction.',
+                                     self.getline(), s.lineno, s.colno)
+            s = self.statement()
+        return a
+
+    def args(self) -> ArgumentNode:
+        s = self.statement()  # type: BaseNode
+        a = ArgumentNode(self.current)
+
+        while not isinstance(s, EmptyNode):
+            potential = self.current
+            if self.accept('comma'):
+                a.commas.append(potential)
+                a.append(s)
+            elif self.accept('colon'):
+                if not isinstance(s, IdNode):
+                    raise ParseException('Dictionary key must be a plain identifier.',
+                                         self.getline(), s.lineno, s.colno)
+                a.set_kwarg(s, self.statement())
+                potential = self.current
+                if not self.accept('comma'):
+                    return a
+                a.commas.append(potential)
+            else:
+                a.append(s)
+                return a
+            s = self.statement()
+        return a
+
+    def method_call(self, source_object: BaseNode) -> MethodNode:
+        methodname = self.e9()
+        if not(isinstance(methodname, IdNode)):
+            raise ParseException('Method name must be plain id',
+                                 self.getline(), self.current.lineno, self.current.colno)
+        assert isinstance(methodname.value, str)
+        self.expect('lparen')
+        args = self.args()
+        self.expect('rparen')
+        method = MethodNode(methodname.filename, methodname.lineno, methodname.colno, source_object, methodname.value, args)
+        if self.accept('dot'):
+            return self.method_call(method)
+        return method
+
+    def index_call(self, source_object: BaseNode) -> IndexNode:
+        index_statement = self.statement()
+        self.expect('rbracket')
+        return IndexNode(source_object, index_statement)
+
+    def foreachblock(self) -> ForeachClauseNode:
+        t = self.current
+        self.expect('id')
+        assert isinstance(t.value, str)
+        varname = t
+        varnames = [t.value]  # type: T.List[str]
+
+        if self.accept('comma'):
+            t = self.current
+            self.expect('id')
+            assert isinstance(t.value, str)
+            varnames.append(t.value)
+
+        self.expect('colon')
+        items = self.statement()
+        block = self.codeblock()
+        return ForeachClauseNode(varname, varnames, items, block)
+
+    def ifblock(self) -> IfClauseNode:
+        condition = self.statement()
+        clause = IfClauseNode(condition)
+        self.expect('eol')
+        block = self.codeblock()
+        clause.ifs.append(IfNode(clause, condition, block))
+        self.elseifblock(clause)
+        clause.elseblock = self.elseblock()
+        return clause
+
+    def elseifblock(self, clause: IfClauseNode) -> None:
+        while self.accept('elif'):
+            s = self.statement()
+            self.expect('eol')
+            b = self.codeblock()
+            clause.ifs.append(IfNode(s, s, b))
+
+    def elseblock(self) -> T.Union[CodeBlockNode, EmptyNode]:
+        if self.accept('else'):
+            self.expect('eol')
+            return self.codeblock()
+        return EmptyNode(self.current.lineno, self.current.colno, self.current.filename)
+
+    def line(self) -> BaseNode:
+        block_start = self.current
+        if self.current == 'eol':
+            return EmptyNode(self.current.lineno, self.current.colno, self.current.filename)
+        if self.accept('if'):
+            ifblock = self.ifblock()
+            self.block_expect('endif', block_start)
+            return ifblock
+        if self.accept('foreach'):
+            forblock = self.foreachblock()
+            self.block_expect('endforeach', block_start)
+            return forblock
+        if self.accept('continue'):
+            return ContinueNode(self.current)
+        if self.accept('break'):
+            return BreakNode(self.current)
+        return self.statement()
+
+    def codeblock(self) -> CodeBlockNode:
+        block = CodeBlockNode(self.current)
+        cond = True
+        while cond:
+            curline = self.line()
+            if not isinstance(curline, EmptyNode):
+                block.lines.append(curline)
+            cond = self.accept('eol')
+        return block