# 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): self.result = re.sub(r'\s+\n', '\n', self.result) def append(self, data: str, node: mparser.BaseNode): level = 0 if node and hasattr(node, 'level'): level = node.level else: level = self.last_level self.last_level = level if self.is_newline: self.result += ' ' * (level * self.indent) self.result += data self.is_newline = False def append_padded(self, data: str, node: mparser.BaseNode): if self.result[-1] not in [' ', '\n']: data = ' ' + data self.append(data + ' ', node) def newline(self): self.result += '\n' self.is_newline = True def visit_BooleanNode(self, node: mparser.BooleanNode): self.append('true' if node.value else 'false', node) def visit_IdNode(self, node: mparser.IdNode): self.append(node.value, node) def visit_NumberNode(self, node: mparser.NumberNode): self.append(str(node.value), node) def visit_StringNode(self, node: mparser.StringNode): self.append("'" + node.value + "'", node) def visit_ContinueNode(self, node: mparser.ContinueNode): self.append('continue', node) def visit_BreakNode(self, node: mparser.BreakNode): self.append('break', node) def visit_ArrayNode(self, node: mparser.ArrayNode): self.append('[', node) node.args.accept(self) self.append(']', node) def visit_DictNode(self, node: mparser.DictNode): self.append('{', node) node.args.accept(self) self.append('}', node) def visit_OrNode(self, node: mparser.OrNode): node.left.accept(self) self.append_padded('or', node) node.right.accept(self) def visit_AndNode(self, node: mparser.AndNode): node.left.accept(self) self.append_padded('and', node) node.right.accept(self) def visit_ComparisonNode(self, node: mparser.ComparisonNode): node.left.accept(self) self.append_padded(mparser.comparison_map[node.ctype], node) node.right.accept(self) def visit_ArithmeticNode(self, node: mparser.ArithmeticNode): node.left.accept(self) self.append_padded(arithmic_map[node.operation], node) node.right.accept(self) def visit_NotNode(self, node: mparser.NotNode): self.append_padded('not', node) node.value.accept(self) def visit_CodeBlockNode(self, node: mparser.CodeBlockNode): for i in node.lines: i.accept(self) self.newline() def visit_IndexNode(self, node: mparser.IndexNode): node.iobject.accept(self) self.append('[', node) node.index.accept(self) self.append(']', node) def visit_MethodNode(self, node: mparser.MethodNode): node.source_object.accept(self) self.append('.' + node.name + '(', node) node.args.accept(self) self.append(')', node) def visit_FunctionNode(self, node: mparser.FunctionNode): self.append(node.func_name + '(', node) node.args.accept(self) self.append(')', node) def visit_AssignmentNode(self, node: mparser.AssignmentNode): self.append(node.var_name + ' = ', node) node.value.accept(self) def visit_PlusAssignmentNode(self, node: mparser.PlusAssignmentNode): self.append(node.var_name + ' += ', node) node.value.accept(self) def visit_ForeachClauseNode(self, node: mparser.ForeachClauseNode): varnames = [x.value 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): 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): self.append_padded('-', node) node.value.accept(self) def visit_IfNode(self, node: mparser.IfNode): node.condition.accept(self) self.newline() node.block.accept(self) def visit_TernaryNode(self, node: mparser.TernaryNode): 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): 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(): self.append(key, node) 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)