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# Copyright 2018 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
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.level = 0
self.ci = ''
self.is_newline = True
def inc_indent(self):
self.level += self.indent
def dec_indent(self):
self.level -= self.indent
def append(self, data: str):
if self.is_newline:
self.result += ' ' * self.level
self.result += data
self.is_newline = False
def appendS(self, data: str):
if self.result[-1] not in [' ', '\n']:
data = ' ' + data
self.append(data + ' ')
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')
def visit_IdNode(self, node: mparser.IdNode):
self.append(node.value)
def visit_NumberNode(self, node: mparser.NumberNode):
self.append(str(node.value))
def visit_StringNode(self, node: mparser.StringNode):
self.append("'" + node.value + "'")
def visit_ContinueNode(self, node: mparser.ContinueNode):
self.append('continue')
def visit_BreakNode(self, node: mparser.BreakNode):
self.append('break')
def visit_ArrayNode(self, node: mparser.ArrayNode):
self.append('[')
self.inc_indent()
node.args.accept(self)
self.dec_indent()
self.append(']')
def visit_DictNode(self, node: mparser.DictNode):
self.append('{')
self.inc_indent()
node.args.accept(self)
self.dec_indent()
self.append('}')
def visit_OrNode(self, node: mparser.OrNode):
node.left.accept(self)
self.appendS('or')
node.right.accept(self)
def visit_AndNode(self, node: mparser.AndNode):
node.left.accept(self)
self.appendS('and')
node.right.accept(self)
def visit_ComparisonNode(self, node: mparser.ComparisonNode):
node.left.accept(self)
self.appendS(mparser.comparison_map[node.ctype])
node.right.accept(self)
def visit_ArithmeticNode(self, node: mparser.ArithmeticNode):
node.left.accept(self)
self.appendS(arithmic_map[node.operation])
node.right.accept(self)
def visit_NotNode(self, node: mparser.NotNode):
self.appendS('not')
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):
self.append('[')
node.index.accept(self)
self.append(']')
def visit_MethodNode(self, node: mparser.MethodNode):
node.source_object.accept(self)
self.append('.' + node.name + '(')
self.inc_indent()
node.args.accept(self)
self.dec_indent()
self.append(')')
def visit_FunctionNode(self, node: mparser.FunctionNode):
self.append(node.func_name + '(')
self.inc_indent()
node.args.accept(self)
self.dec_indent()
self.append(')')
def visit_AssignmentNode(self, node: mparser.AssignmentNode):
self.append(node.var_name + ' = ')
node.value.accept(self)
def visit_PlusAssignmentNode(self, node: mparser.PlusAssignmentNode):
self.append(node.var_name + ' += ')
node.value.accept(self)
def visit_ForeachClauseNode(self, node: mparser.ForeachClauseNode):
varnames = [x.value for x in node.varnames]
self.appendS('foreach')
self.appendS(', '.join(varnames))
self.appendS(':')
node.items.accept(self)
self.newline()
self.inc_indent()
node.block.accept(self)
self.dec_indent()
self.append('endforeach')
def visit_IfClauseNode(self, node: mparser.IfClauseNode):
prefix = ''
for i in node.ifs:
self.appendS(prefix + 'if')
prefix = 'el'
i.accept(self)
if node.elseblock:
self.append('else')
self.indent()
self.inc_indent()
node.elseblock.accept(self)
self.dec_indent()
self.append('endif')
def visit_UMinusNode(self, node: mparser.UMinusNode):
self.appendS('-')
node.value.accept(self)
def visit_IfNode(self, node: mparser.IfNode):
node.condition.accept(self)
self.newline()
self.inc_indent()
node.block.accept(self)
self.dec_indent()
def visit_TernaryNode(self, node: mparser.TernaryNode):
node.condition.accept(self)
self.appendS('?')
node.trueblock.accept(self)
self.appendS(':')
node.falseblock.accept(self)
def visit_ArgumentNode(self, node: mparser.ArgumentNode):
break_args = True if (len(node.arguments) + len(node.kwargs)) > self.arg_newline_cutoff else False
for i in node.arguments + list(node.kwargs.values()):
if not isinstance(i, mparser.ElementaryNode):
break_args = True
if break_args:
self.newline()
for i in node.arguments:
i.accept(self)
self.append(',')
if break_args:
self.newline()
for key, val in node.kwargs.items():
self.append(key)
self.appendS(':')
val.accept(self)
self.append(',')
if break_args:
self.newline()
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