| # Copyright 2019 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. |
| |
| # This class contains the basic functionality needed to run any interpreter |
| # or an interpreter-based tool |
| |
| from .. import mparser |
| from . import AstVisitor |
| import re |
| |
| arithmic_map = { |
| 'add': '+', |
| 'sub': '-', |
| 'mod': '%', |
| 'mul': '*', |
| 'div': '/' |
| } |
| |
| class AstPrinter(AstVisitor): |
| def __init__(self, indent: int = 2, arg_newline_cutoff: int = 5): |
| self.result = '' |
| self.indent = indent |
| self.arg_newline_cutoff = arg_newline_cutoff |
| self.ci = '' |
| self.is_newline = True |
| self.last_level = 0 |
| |
| def post_process(self) -> None: |
| self.result = re.sub(r'\s+\n', '\n', self.result) |
| |
| def append(self, data: str, node: mparser.BaseNode) -> None: |
| self.last_level = node.level |
| if self.is_newline: |
| self.result += ' ' * (node.level * self.indent) |
| self.result += data |
| self.is_newline = False |
| |
| def append_padded(self, data: str, node: mparser.BaseNode) -> None: |
| if self.result[-1] not in [' ', '\n']: |
| data = ' ' + data |
| self.append(data + ' ', node) |
| |
| def newline(self) -> None: |
| self.result += '\n' |
| self.is_newline = True |
| |
| def visit_BooleanNode(self, node: mparser.BooleanNode) -> None: |
| self.append('true' if node.value else 'false', node) |
| |
| def visit_IdNode(self, node: mparser.IdNode) -> None: |
| assert isinstance(node.value, str) |
| self.append(node.value, node) |
| |
| def visit_NumberNode(self, node: mparser.NumberNode) -> None: |
| self.append(str(node.value), node) |
| |
| def visit_StringNode(self, node: mparser.StringNode) -> None: |
| assert isinstance(node.value, str) |
| self.append("'" + node.value + "'", node) |
| |
| def visit_ContinueNode(self, node: mparser.ContinueNode) -> None: |
| self.append('continue', node) |
| |
| def visit_BreakNode(self, node: mparser.BreakNode) -> None: |
| self.append('break', node) |
| |
| def visit_ArrayNode(self, node: mparser.ArrayNode) -> None: |
| self.append('[', node) |
| node.args.accept(self) |
| self.append(']', node) |
| |
| def visit_DictNode(self, node: mparser.DictNode) -> None: |
| self.append('{', node) |
| node.args.accept(self) |
| self.append('}', node) |
| |
| def visit_OrNode(self, node: mparser.OrNode) -> None: |
| node.left.accept(self) |
| self.append_padded('or', node) |
| node.right.accept(self) |
| |
| def visit_AndNode(self, node: mparser.AndNode) -> None: |
| node.left.accept(self) |
| self.append_padded('and', node) |
| node.right.accept(self) |
| |
| def visit_ComparisonNode(self, node: mparser.ComparisonNode) -> None: |
| node.left.accept(self) |
| self.append_padded(node.ctype, node) |
| node.right.accept(self) |
| |
| def visit_ArithmeticNode(self, node: mparser.ArithmeticNode) -> None: |
| node.left.accept(self) |
| self.append_padded(arithmic_map[node.operation], node) |
| node.right.accept(self) |
| |
| def visit_NotNode(self, node: mparser.NotNode) -> None: |
| self.append_padded('not', node) |
| node.value.accept(self) |
| |
| def visit_CodeBlockNode(self, node: mparser.CodeBlockNode) -> None: |
| for i in node.lines: |
| i.accept(self) |
| self.newline() |
| |
| def visit_IndexNode(self, node: mparser.IndexNode) -> None: |
| node.iobject.accept(self) |
| self.append('[', node) |
| node.index.accept(self) |
| self.append(']', node) |
| |
| def visit_MethodNode(self, node: mparser.MethodNode) -> None: |
| node.source_object.accept(self) |
| self.append('.' + node.name + '(', node) |
| node.args.accept(self) |
| self.append(')', node) |
| |
| def visit_FunctionNode(self, node: mparser.FunctionNode) -> None: |
| self.append(node.func_name + '(', node) |
| node.args.accept(self) |
| self.append(')', node) |
| |
| def visit_AssignmentNode(self, node: mparser.AssignmentNode) -> None: |
| self.append(node.var_name + ' = ', node) |
| node.value.accept(self) |
| |
| def visit_PlusAssignmentNode(self, node: mparser.PlusAssignmentNode) -> None: |
| self.append(node.var_name + ' += ', node) |
| node.value.accept(self) |
| |
| def visit_ForeachClauseNode(self, node: mparser.ForeachClauseNode) -> None: |
| varnames = [x for x in node.varnames] |
| self.append_padded('foreach', node) |
| self.append_padded(', '.join(varnames), node) |
| self.append_padded(':', node) |
| node.items.accept(self) |
| self.newline() |
| node.block.accept(self) |
| self.append('endforeach', node) |
| |
| def visit_IfClauseNode(self, node: mparser.IfClauseNode) -> None: |
| prefix = '' |
| for i in node.ifs: |
| self.append_padded(prefix + 'if', node) |
| prefix = 'el' |
| i.accept(self) |
| if node.elseblock: |
| self.append('else', node) |
| node.elseblock.accept(self) |
| self.append('endif', node) |
| |
| def visit_UMinusNode(self, node: mparser.UMinusNode) -> None: |
| self.append_padded('-', node) |
| node.value.accept(self) |
| |
| def visit_IfNode(self, node: mparser.IfNode) -> None: |
| node.condition.accept(self) |
| self.newline() |
| node.block.accept(self) |
| |
| def visit_TernaryNode(self, node: mparser.TernaryNode) -> None: |
| node.condition.accept(self) |
| self.append_padded('?', node) |
| node.trueblock.accept(self) |
| self.append_padded(':', node) |
| node.falseblock.accept(self) |
| |
| def visit_ArgumentNode(self, node: mparser.ArgumentNode) -> None: |
| break_args = (len(node.arguments) + len(node.kwargs)) > self.arg_newline_cutoff |
| for i in node.arguments + list(node.kwargs.values()): |
| if not isinstance(i, (mparser.ElementaryNode, mparser.IndexNode)): |
| break_args = True |
| if break_args: |
| self.newline() |
| for i in node.arguments: |
| i.accept(self) |
| self.append(', ', node) |
| if break_args: |
| self.newline() |
| for key, val in node.kwargs.items(): |
| key.accept(self) |
| self.append_padded(':', node) |
| val.accept(self) |
| self.append(', ', node) |
| if break_args: |
| self.newline() |
| if break_args: |
| self.result = re.sub(r', \n$', '\n', self.result) |
| else: |
| self.result = re.sub(r', $', '', self.result) |
