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204 lines
6.7 KiB
204 lines
6.7 KiB
# Copyright 2019 The Meson development team |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# This class contains the basic functionality needed to run any interpreter |
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# or an interpreter-based tool |
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from .. import mparser |
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from . import AstVisitor |
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import re |
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arithmic_map = { |
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'add': '+', |
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'sub': '-', |
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'mod': '%', |
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'mul': '*', |
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'div': '/' |
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} |
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class AstPrinter(AstVisitor): |
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def __init__(self, indent: int = 2, arg_newline_cutoff: int = 5): |
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self.result = '' |
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self.indent = indent |
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self.arg_newline_cutoff = arg_newline_cutoff |
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self.ci = '' |
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self.is_newline = True |
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self.last_level = 0 |
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def post_process(self): |
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self.result = re.sub(r'\s+\n', '\n', self.result) |
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def append(self, data: str, node: mparser.BaseNode): |
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level = 0 |
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if node and hasattr(node, 'level'): |
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level = node.level |
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else: |
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level = self.last_level |
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self.last_level = level |
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if self.is_newline: |
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self.result += ' ' * (level * self.indent) |
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self.result += data |
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self.is_newline = False |
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def append_padded(self, data: str, node: mparser.BaseNode): |
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if self.result[-1] not in [' ', '\n']: |
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data = ' ' + data |
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self.append(data + ' ', node) |
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def newline(self): |
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self.result += '\n' |
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self.is_newline = True |
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def visit_BooleanNode(self, node: mparser.BooleanNode): |
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self.append('true' if node.value else 'false', node) |
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def visit_IdNode(self, node: mparser.IdNode): |
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self.append(node.value, node) |
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def visit_NumberNode(self, node: mparser.NumberNode): |
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self.append(str(node.value), node) |
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def visit_StringNode(self, node: mparser.StringNode): |
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self.append("'" + node.value + "'", node) |
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def visit_ContinueNode(self, node: mparser.ContinueNode): |
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self.append('continue', node) |
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def visit_BreakNode(self, node: mparser.BreakNode): |
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self.append('break', node) |
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def visit_ArrayNode(self, node: mparser.ArrayNode): |
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self.append('[', node) |
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node.args.accept(self) |
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self.append(']', node) |
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def visit_DictNode(self, node: mparser.DictNode): |
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self.append('{', node) |
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node.args.accept(self) |
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self.append('}', node) |
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def visit_OrNode(self, node: mparser.OrNode): |
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node.left.accept(self) |
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self.append_padded('or', node) |
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node.right.accept(self) |
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def visit_AndNode(self, node: mparser.AndNode): |
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node.left.accept(self) |
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self.append_padded('and', node) |
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node.right.accept(self) |
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def visit_ComparisonNode(self, node: mparser.ComparisonNode): |
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node.left.accept(self) |
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self.append_padded(mparser.comparison_map[node.ctype], node) |
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node.right.accept(self) |
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def visit_ArithmeticNode(self, node: mparser.ArithmeticNode): |
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node.left.accept(self) |
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self.append_padded(arithmic_map[node.operation], node) |
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node.right.accept(self) |
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def visit_NotNode(self, node: mparser.NotNode): |
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self.append_padded('not', node) |
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node.value.accept(self) |
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def visit_CodeBlockNode(self, node: mparser.CodeBlockNode): |
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for i in node.lines: |
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i.accept(self) |
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self.newline() |
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def visit_IndexNode(self, node: mparser.IndexNode): |
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node.iobject.accept(self) |
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self.append('[', node) |
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node.index.accept(self) |
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self.append(']', node) |
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def visit_MethodNode(self, node: mparser.MethodNode): |
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node.source_object.accept(self) |
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self.append('.' + node.name + '(', node) |
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node.args.accept(self) |
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self.append(')', node) |
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def visit_FunctionNode(self, node: mparser.FunctionNode): |
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self.append(node.func_name + '(', node) |
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node.args.accept(self) |
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self.append(')', node) |
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def visit_AssignmentNode(self, node: mparser.AssignmentNode): |
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self.append(node.var_name + ' = ', node) |
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node.value.accept(self) |
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def visit_PlusAssignmentNode(self, node: mparser.PlusAssignmentNode): |
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self.append(node.var_name + ' += ', node) |
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node.value.accept(self) |
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def visit_ForeachClauseNode(self, node: mparser.ForeachClauseNode): |
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varnames = [x.value for x in node.varnames] |
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self.append_padded('foreach', node) |
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self.append_padded(', '.join(varnames), node) |
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self.append_padded(':', node) |
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node.items.accept(self) |
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self.newline() |
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node.block.accept(self) |
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self.append('endforeach', node) |
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def visit_IfClauseNode(self, node: mparser.IfClauseNode): |
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prefix = '' |
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for i in node.ifs: |
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self.append_padded(prefix + 'if', node) |
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prefix = 'el' |
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i.accept(self) |
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if node.elseblock: |
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self.append('else', node) |
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node.elseblock.accept(self) |
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self.append('endif', node) |
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def visit_UMinusNode(self, node: mparser.UMinusNode): |
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self.append_padded('-', node) |
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node.value.accept(self) |
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def visit_IfNode(self, node: mparser.IfNode): |
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node.condition.accept(self) |
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self.newline() |
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node.block.accept(self) |
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def visit_TernaryNode(self, node: mparser.TernaryNode): |
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node.condition.accept(self) |
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self.append_padded('?', node) |
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node.trueblock.accept(self) |
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self.append_padded(':', node) |
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node.falseblock.accept(self) |
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def visit_ArgumentNode(self, node: mparser.ArgumentNode): |
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break_args = (len(node.arguments) + len(node.kwargs)) > self.arg_newline_cutoff |
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for i in node.arguments + list(node.kwargs.values()): |
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if not isinstance(i, (mparser.ElementaryNode, mparser.IndexNode)): |
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break_args = True |
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if break_args: |
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self.newline() |
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for i in node.arguments: |
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i.accept(self) |
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self.append(', ', node) |
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if break_args: |
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self.newline() |
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for key, val in node.kwargs.items(): |
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self.append(key, node) |
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self.append_padded(':', node) |
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val.accept(self) |
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self.append(', ', node) |
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if break_args: |
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self.newline() |
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if break_args: |
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self.result = re.sub(r', \n$', '\n', self.result) |
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else: |
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self.result = re.sub(r', $', '', self.result)
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