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https://gitlab.gnome.org/jwestman/blueprint-compiler.git
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ae40f8416f
Should make it clearer what a "variable" is and allow more flexibility in what a variable can be (previously it could only be an object, but now it can be e.g. a reference to the template or a special shortcut)
71 lines
2 KiB
Python
71 lines
2 KiB
Python
# expressions.py
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#
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# Copyright 2022 James Westman <james@jwestman.net>
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 3 of the
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# License, or (at your option) any later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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from .common import *
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expr = Pratt()
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class Expr(AstNode):
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grammar = expr
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def emit_xml(self, xml: XmlEmitter):
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self.children[-1].emit_xml(xml)
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class InfixExpr(AstNode):
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@property
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def lhs(self):
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children = list(self.parent_by_type(Expr).children)
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return children[children.index(self) - 1]
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class IdentExpr(AstNode):
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grammar = UseIdent("ident")
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@property
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def is_this(self):
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return self.parent_by_type(Scope).this_name == self.tokens["ident"]
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def emit_xml(self, xml: XmlEmitter):
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if self.is_this:
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raise CompilerBugError()
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self.parent_by_type(Scope).variables[self.tokens["ident"]].emit_xml(xml)
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class LookupOp(InfixExpr):
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grammar = [".", UseIdent("property")]
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def emit_xml(self, xml: XmlEmitter):
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if isinstance(self.lhs, IdentExpr) and self.lhs.is_this:
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xml.put_self_closing("lookup", name=self.tokens["property"], type=self.parent_by_type(Scope).this_type)
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else:
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xml.start_tag("lookup", name=self.tokens["property"])
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self.lhs.emit_xml(xml)
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xml.end_tag()
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expr.children = [
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Prefix(IdentExpr),
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Prefix(["(", Expr, ")"]),
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Infix(10, LookupOp),
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]
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