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Contents
# frozen_string_literal: true
require_relative 'parser.racc'
module RuboCop
module AST
class NodePattern
# Parser for NodePattern
# Note: class reopened in `parser.racc`
#
# Doc on how this fits in the compiling process:
# /docs/modules/ROOT/pages/node_pattern.adoc
class Parser < Racc::Parser
extend Forwardable
Builder = NodePattern::Builder
Lexer = NodePattern::Lexer
def initialize(builder = self.class::Builder.new)
super()
@builder = builder
end
##
# (Similar API to `parser` gem)
# Parses a source and returns the AST.
#
# @param [Parser::Source::Buffer, String] source_buffer The source buffer to parse.
# @return [NodePattern::Node]
#
def parse(source)
@lexer = self.class::Lexer.new(source)
do_parse
rescue Lexer::Error => e
raise NodePattern::Invalid, e.message
ensure
@lexer = nil # Don't keep references
end
def inspect
"<##{self.class}>"
end
private
def_delegators :@builder, :emit_list, :emit_unary_op, :emit_atom, :emit_capture,
:emit_call, :emit_union
def_delegators :@lexer, :next_token
def enforce_unary(node)
return node if node.arity == 1
detail = node.loc&.expression&.source || node.to_s
raise NodePattern::Invalid, 'parse error, expected unary node pattern ' \
"but got expression matching multiple elements: #{detail}"
end
# Overrides Racc::Parser's method:
def on_error(token, val, _vstack)
detail = token_to_str(token) || '?'
raise NodePattern::Invalid, "parse error on value #{val.inspect} (#{detail})"
end
end
end
end
end
Version data entries
154 entries across 148 versions & 21 rubygems