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+# pyshyacc.py - PLY grammar definition for pysh
+#
+# Copyright 2007 Patrick Mezard
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+"""PLY grammar file.
+"""
+import sys
+
+import pyshlex
+tokens = pyshlex.tokens
+
+from ply import yacc
+import sherrors
+
+class IORedirect:
+ def __init__(self, op, filename, io_number=None):
+ self.op = op
+ self.filename = filename
+ self.io_number = io_number
+
+class HereDocument:
+ def __init__(self, op, name, content, io_number=None):
+ self.op = op
+ self.name = name
+ self.content = content
+ self.io_number = io_number
+
+def make_io_redirect(p):
+ """Make an IORedirect instance from the input 'io_redirect' production."""
+ name, io_number, io_target = p
+ assert name=='io_redirect'
+
+ if io_target[0]=='io_file':
+ io_type, io_op, io_file = io_target
+ return IORedirect(io_op, io_file, io_number)
+ elif io_target[0]=='io_here':
+ io_type, io_op, io_name, io_content = io_target
+ return HereDocument(io_op, io_name, io_content, io_number)
+ else:
+ assert False, "Invalid IO redirection token %s" % repr(io_type)
+
+class SimpleCommand:
+ """
+ assigns contains (name, value) pairs.
+ """
+ def __init__(self, words, redirs, assigns):
+ self.words = list(words)
+ self.redirs = list(redirs)
+ self.assigns = list(assigns)
+
+class Pipeline:
+ def __init__(self, commands, reverse_status=False):
+ self.commands = list(commands)
+ assert self.commands #Grammar forbids this
+ self.reverse_status = reverse_status
+
+class AndOr:
+ def __init__(self, op, left, right):
+ self.op = str(op)
+ self.left = left
+ self.right = right
+
+class ForLoop:
+ def __init__(self, name, items, cmds):
+ self.name = str(name)
+ self.items = list(items)
+ self.cmds = list(cmds)
+
+class WhileLoop:
+ def __init__(self, condition, cmds):
+ self.condition = list(condition)
+ self.cmds = list(cmds)
+
+class UntilLoop:
+ def __init__(self, condition, cmds):
+ self.condition = list(condition)
+ self.cmds = list(cmds)
+
+class FunDef:
+ def __init__(self, name, body):
+ self.name = str(name)
+ self.body = body
+
+class BraceGroup:
+ def __init__(self, cmds):
+ self.cmds = list(cmds)
+
+class IfCond:
+ def __init__(self, cond, if_cmds, else_cmds):
+ self.cond = list(cond)
+ self.if_cmds = if_cmds
+ self.else_cmds = else_cmds
+
+class Case:
+ def __init__(self, name, items):
+ self.name = name
+ self.items = items
+
+class SubShell:
+ def __init__(self, cmds):
+ self.cmds = cmds
+
+class RedirectList:
+ def __init__(self, cmd, redirs):
+ self.cmd = cmd
+ self.redirs = list(redirs)
+
+def get_production(productions, ptype):
+ """productions must be a list of production tuples like (name, obj) where
+ name is the production string identifier.
+ Return the first production named 'ptype'. Raise KeyError if None can be
+ found.
+ """
+ for production in productions:
+ if production is not None and production[0]==ptype:
+ return production
+ raise KeyError(ptype)
+
+#-------------------------------------------------------------------------------
+# PLY grammar definition
+#-------------------------------------------------------------------------------
+
+def p_multiple_commands(p):
+ """multiple_commands : newline_sequence
+ | complete_command
+ | multiple_commands complete_command"""
+ if len(p)==2:
+ if p[1] is not None:
+ p[0] = [p[1]]
+ else:
+ p[0] = []
+ else:
+ p[0] = p[1] + [p[2]]
+
+def p_complete_command(p):
+ """complete_command : list separator
+ | list"""
+ if len(p)==3 and p[2] and p[2][1] == '&':
+ p[0] = ('async', p[1])
+ else:
+ p[0] = p[1]
+
+def p_list(p):
+ """list : list separator_op and_or
+ | and_or"""
+ if len(p)==2:
+ p[0] = [p[1]]
+ else:
+ #if p[2]!=';':
+ # raise NotImplementedError('AND-OR list asynchronous execution is not implemented')
+ p[0] = p[1] + [p[3]]
+
+def p_and_or(p):
+ """and_or : pipeline
+ | and_or AND_IF linebreak pipeline
+ | and_or OR_IF linebreak pipeline"""
+ if len(p)==2:
+ p[0] = p[1]
+ else:
+ p[0] = ('and_or', AndOr(p[2], p[1], p[4]))
+
+def p_maybe_bang_word(p):
+ """maybe_bang_word : Bang"""
+ p[0] = ('maybe_bang_word', p[1])
+
+def p_pipeline(p):
+ """pipeline : pipe_sequence
+ | bang_word pipe_sequence"""
+ if len(p)==3:
+ p[0] = ('pipeline', Pipeline(p[2][1:], True))
+ else:
+ p[0] = ('pipeline', Pipeline(p[1][1:]))
+
+def p_pipe_sequence(p):
+ """pipe_sequence : command
+ | pipe_sequence PIPE linebreak command"""
+ if len(p)==2:
+ p[0] = ['pipe_sequence', p[1]]
+ else:
+ p[0] = p[1] + [p[4]]
+
+def p_command(p):
+ """command : simple_command
+ | compound_command
+ | compound_command redirect_list
+ | function_definition"""
+
+ if p[1][0] in ( 'simple_command',
+ 'for_clause',
+ 'while_clause',
+ 'until_clause',
+ 'case_clause',
+ 'if_clause',
+ 'function_definition',
+ 'subshell',
+ 'brace_group',):
+ if len(p) == 2:
+ p[0] = p[1]
+ else:
+ p[0] = ('redirect_list', RedirectList(p[1], p[2][1:]))
+ else:
+ raise NotImplementedError('%s command is not implemented' % repr(p[1][0]))
+
+def p_compound_command(p):
+ """compound_command : brace_group
+ | subshell
+ | for_clause
+ | case_clause
+ | if_clause
+ | while_clause
+ | until_clause"""
+ p[0] = p[1]
+
+def p_subshell(p):
+ """subshell : LPARENS compound_list RPARENS"""
+ p[0] = ('subshell', SubShell(p[2][1:]))
+
+def p_compound_list(p):
+ """compound_list : term
+ | newline_list term
+ | term separator
+ | newline_list term separator"""
+ productions = p[1:]
+ try:
+ sep = get_production(productions, 'separator')
+ if sep[1]!=';':
+ raise NotImplementedError()
+ except KeyError:
+ pass
+ term = get_production(productions, 'term')
+ p[0] = ['compound_list'] + term[1:]
+
+def p_term(p):
+ """term : term separator and_or
+ | and_or"""
+ if len(p)==2:
+ p[0] = ['term', p[1]]
+ else:
+ if p[2] is not None and p[2][1] == '&':
+ p[0] = ['term', ('async', p[1][1:])] + [p[3]]
+ else:
+ p[0] = p[1] + [p[3]]
+
+def p_maybe_for_word(p):
+ # Rearrange 'For' priority wrt TOKEN. See p_for_word
+ """maybe_for_word : For"""
+ p[0] = ('maybe_for_word', p[1])
+
+def p_for_clause(p):
+ """for_clause : for_word name linebreak do_group
+ | for_word name linebreak in sequential_sep do_group
+ | for_word name linebreak in wordlist sequential_sep do_group"""
+ productions = p[1:]
+ do_group = get_production(productions, 'do_group')
+ try:
+ items = get_production(productions, 'in')[1:]
+ except KeyError:
+ raise NotImplementedError('"in" omission is not implemented')
+
+ try:
+ items = get_production(productions, 'wordlist')[1:]
+ except KeyError:
+ items = []
+
+ name = p[2]
+ p[0] = ('for_clause', ForLoop(name, items, do_group[1:]))
+
+def p_name(p):
+ """name : token""" #Was NAME instead of token
+ p[0] = p[1]
+
+def p_in(p):
+ """in : In"""
+ p[0] = ('in', p[1])
+
+def p_wordlist(p):
+ """wordlist : wordlist token
+ | token"""
+ if len(p)==2:
+ p[0] = ['wordlist', ('TOKEN', p[1])]
+ else:
+ p[0] = p[1] + [('TOKEN', p[2])]
+
+def p_case_clause(p):
+ """case_clause : Case token linebreak in linebreak case_list Esac
+ | Case token linebreak in linebreak case_list_ns Esac
+ | Case token linebreak in linebreak Esac"""
+ if len(p) < 8:
+ items = []
+ else:
+ items = p[6][1:]
+ name = p[2]
+ p[0] = ('case_clause', Case(name, [c[1] for c in items]))
+
+def p_case_list_ns(p):
+ """case_list_ns : case_list case_item_ns
+ | case_item_ns"""
+ p_case_list(p)
+
+def p_case_list(p):
+ """case_list : case_list case_item
+ | case_item"""
+ if len(p)==2:
+ p[0] = ['case_list', p[1]]
+ else:
+ p[0] = p[1] + [p[2]]
+
+def p_case_item_ns(p):
+ """case_item_ns : pattern RPARENS linebreak
+ | pattern RPARENS compound_list linebreak
+ | LPARENS pattern RPARENS linebreak
+ | LPARENS pattern RPARENS compound_list linebreak"""
+ p_case_item(p)
+
+def p_case_item(p):
+ """case_item : pattern RPARENS linebreak DSEMI linebreak
+ | pattern RPARENS compound_list DSEMI linebreak
+ | LPARENS pattern RPARENS linebreak DSEMI linebreak
+ | LPARENS pattern RPARENS compound_list DSEMI linebreak"""
+ if len(p) < 7:
+ name = p[1][1:]
+ else:
+ name = p[2][1:]
+
+ try:
+ cmds = get_production(p[1:], "compound_list")[1:]
+ except KeyError:
+ cmds = []
+
+ p[0] = ('case_item', (name, cmds))
+
+def p_pattern(p):
+ """pattern : token
+ | pattern PIPE token"""
+ if len(p)==2:
+ p[0] = ['pattern', ('TOKEN', p[1])]
+ else:
+ p[0] = p[1] + [('TOKEN', p[2])]
+
+def p_maybe_if_word(p):
+ # Rearrange 'If' priority wrt TOKEN. See p_if_word
+ """maybe_if_word : If"""
+ p[0] = ('maybe_if_word', p[1])
+
+def p_maybe_then_word(p):
+ # Rearrange 'Then' priority wrt TOKEN. See p_then_word
+ """maybe_then_word : Then"""
+ p[0] = ('maybe_then_word', p[1])
+
+def p_if_clause(p):
+ """if_clause : if_word compound_list then_word compound_list else_part Fi
+ | if_word compound_list then_word compound_list Fi"""
+ else_part = []
+ if len(p)==7:
+ else_part = p[5]
+ p[0] = ('if_clause', IfCond(p[2][1:], p[4][1:], else_part))
+
+def p_else_part(p):
+ """else_part : Elif compound_list then_word compound_list else_part
+ | Elif compound_list then_word compound_list
+ | Else compound_list"""
+ if len(p)==3:
+ p[0] = p[2][1:]
+ else:
+ else_part = []
+ if len(p)==6:
+ else_part = p[5]
+ p[0] = ('elif', IfCond(p[2][1:], p[4][1:], else_part))
+
+def p_while_clause(p):
+ """while_clause : While compound_list do_group"""
+ p[0] = ('while_clause', WhileLoop(p[2][1:], p[3][1:]))
+
+def p_maybe_until_word(p):
+ # Rearrange 'Until' priority wrt TOKEN. See p_until_word
+ """maybe_until_word : Until"""
+ p[0] = ('maybe_until_word', p[1])
+
+def p_until_clause(p):
+ """until_clause : until_word compound_list do_group"""
+ p[0] = ('until_clause', UntilLoop(p[2][1:], p[3][1:]))
+
+def p_function_definition(p):
+ """function_definition : fname LPARENS RPARENS linebreak function_body"""
+ p[0] = ('function_definition', FunDef(p[1], p[5]))
+
+def p_function_body(p):
+ """function_body : compound_command
+ | compound_command redirect_list"""
+ if len(p)!=2:
+ raise NotImplementedError('functions redirections lists are not implemented')
+ p[0] = p[1]
+
+def p_fname(p):
+ """fname : TOKEN""" #Was NAME instead of token
+ p[0] = p[1]
+
+def p_brace_group(p):
+ """brace_group : Lbrace compound_list Rbrace"""
+ p[0] = ('brace_group', BraceGroup(p[2][1:]))
+
+def p_maybe_done_word(p):
+ #See p_assignment_word for details.
+ """maybe_done_word : Done"""
+ p[0] = ('maybe_done_word', p[1])
+
+def p_maybe_do_word(p):
+ """maybe_do_word : Do"""
+ p[0] = ('maybe_do_word', p[1])
+
+def p_do_group(p):
+ """do_group : do_word compound_list done_word"""
+ #Do group contains a list of AndOr
+ p[0] = ['do_group'] + p[2][1:]
+
+def p_simple_command(p):
+ """simple_command : cmd_prefix cmd_word cmd_suffix
+ | cmd_prefix cmd_word
+ | cmd_prefix
+ | cmd_name cmd_suffix
+ | cmd_name"""
+ words, redirs, assigns = [], [], []
+ for e in p[1:]:
+ name = e[0]
+ if name in ('cmd_prefix', 'cmd_suffix'):
+ for sube in e[1:]:
+ subname = sube[0]
+ if subname=='io_redirect':
+ redirs.append(make_io_redirect(sube))
+ elif subname=='ASSIGNMENT_WORD':
+ assigns.append(sube)
+ else:
+ words.append(sube)
+ elif name in ('cmd_word', 'cmd_name'):
+ words.append(e)
+
+ cmd = SimpleCommand(words, redirs, assigns)
+ p[0] = ('simple_command', cmd)
+
+def p_cmd_name(p):
+ """cmd_name : TOKEN"""
+ p[0] = ('cmd_name', p[1])
+
+def p_cmd_word(p):
+ """cmd_word : token"""
+ p[0] = ('cmd_word', p[1])
+
+def p_maybe_assignment_word(p):
+ #See p_assignment_word for details.
+ """maybe_assignment_word : ASSIGNMENT_WORD"""
+ p[0] = ('maybe_assignment_word', p[1])
+
+def p_cmd_prefix(p):
+ """cmd_prefix : io_redirect
+ | cmd_prefix io_redirect
+ | assignment_word
+ | cmd_prefix assignment_word"""
+ try:
+ prefix = get_production(p[1:], 'cmd_prefix')
+ except KeyError:
+ prefix = ['cmd_prefix']
+
+ try:
+ value = get_production(p[1:], 'assignment_word')[1]
+ value = ('ASSIGNMENT_WORD', value.split('=', 1))
+ except KeyError:
+ value = get_production(p[1:], 'io_redirect')
+ p[0] = prefix + [value]
+
+def p_cmd_suffix(p):
+ """cmd_suffix : io_redirect
+ | cmd_suffix io_redirect
+ | token
+ | cmd_suffix token
+ | maybe_for_word
+ | cmd_suffix maybe_for_word
+ | maybe_done_word
+ | cmd_suffix maybe_done_word
+ | maybe_do_word
+ | cmd_suffix maybe_do_word
+ | maybe_until_word
+ | cmd_suffix maybe_until_word
+ | maybe_assignment_word
+ | cmd_suffix maybe_assignment_word
+ | maybe_if_word
+ | cmd_suffix maybe_if_word
+ | maybe_then_word
+ | cmd_suffix maybe_then_word
+ | maybe_bang_word
+ | cmd_suffix maybe_bang_word"""
+ try:
+ suffix = get_production(p[1:], 'cmd_suffix')
+ token = p[2]
+ except KeyError:
+ suffix = ['cmd_suffix']
+ token = p[1]
+
+ if isinstance(token, tuple):
+ if token[0]=='io_redirect':
+ p[0] = suffix + [token]
+ else:
+ #Convert maybe_* to TOKEN if necessary
+ p[0] = suffix + [('TOKEN', token[1])]
+ else:
+ p[0] = suffix + [('TOKEN', token)]
+
+def p_redirect_list(p):
+ """redirect_list : io_redirect
+ | redirect_list io_redirect"""
+ if len(p) == 2:
+ p[0] = ['redirect_list', make_io_redirect(p[1])]
+ else:
+ p[0] = p[1] + [make_io_redirect(p[2])]
+
+def p_io_redirect(p):
+ """io_redirect : io_file
+ | IO_NUMBER io_file
+ | io_here
+ | IO_NUMBER io_here"""
+ if len(p)==3:
+ p[0] = ('io_redirect', p[1], p[2])
+ else:
+ p[0] = ('io_redirect', None, p[1])
+
+def p_io_file(p):
+ #Return the tuple (operator, filename)
+ """io_file : LESS filename
+ | LESSAND filename
+ | GREATER filename
+ | GREATAND filename
+ | DGREAT filename
+ | LESSGREAT filename
+ | CLOBBER filename"""
+ #Extract the filename from the file
+ p[0] = ('io_file', p[1], p[2][1])
+
+def p_filename(p):
+ #Return the filename
+ """filename : TOKEN"""
+ p[0] = ('filename', p[1])
+
+def p_io_here(p):
+ """io_here : DLESS here_end
+ | DLESSDASH here_end"""
+ p[0] = ('io_here', p[1], p[2][1], p[2][2])
+
+def p_here_end(p):
+ """here_end : HERENAME TOKEN"""
+ p[0] = ('here_document', p[1], p[2])
+
+def p_newline_sequence(p):
+ # Nothing in the grammar can handle leading NEWLINE productions, so add
+ # this one with the lowest possible priority relatively to newline_list.
+ """newline_sequence : newline_list"""
+ p[0] = None
+
+def p_newline_list(p):
+ """newline_list : NEWLINE
+ | newline_list NEWLINE"""
+ p[0] = None
+
+def p_linebreak(p):
+ """linebreak : newline_list
+ | empty"""
+ p[0] = None
+
+def p_separator_op(p):
+ """separator_op : COMMA
+ | AMP"""
+ p[0] = p[1]
+
+def p_separator(p):
+ """separator : separator_op linebreak
+ | newline_list"""
+ if len(p)==2:
+ #Ignore newlines
+ p[0] = None
+ else:
+ #Keep the separator operator
+ p[0] = ('separator', p[1])
+
+def p_sequential_sep(p):
+ """sequential_sep : COMMA linebreak
+ | newline_list"""
+ p[0] = None
+
+# Low priority TOKEN => for_word conversion.
+# Let maybe_for_word be used as a token when necessary in higher priority
+# rules.
+def p_for_word(p):
+ """for_word : maybe_for_word"""
+ p[0] = p[1]
+
+def p_if_word(p):
+ """if_word : maybe_if_word"""
+ p[0] = p[1]
+
+def p_then_word(p):
+ """then_word : maybe_then_word"""
+ p[0] = p[1]
+
+def p_done_word(p):
+ """done_word : maybe_done_word"""
+ p[0] = p[1]
+
+def p_do_word(p):
+ """do_word : maybe_do_word"""
+ p[0] = p[1]
+
+def p_until_word(p):
+ """until_word : maybe_until_word"""
+ p[0] = p[1]
+
+def p_assignment_word(p):
+ """assignment_word : maybe_assignment_word"""
+ p[0] = ('assignment_word', p[1][1])
+
+def p_bang_word(p):
+ """bang_word : maybe_bang_word"""
+ p[0] = ('bang_word', p[1][1])
+
+def p_token(p):
+ """token : TOKEN
+ | Fi"""
+ p[0] = p[1]
+
+def p_empty(p):
+ 'empty :'
+ p[0] = None
+
+# Error rule for syntax errors
+def p_error(p):
+ msg = []
+ w = msg.append
+ w('%r\n' % p)
+ w('followed by:\n')
+ for i in range(5):
+ n = yacc.token()
+ if not n:
+ break
+ w(' %r\n' % n)
+ raise sherrors.ShellSyntaxError(''.join(msg))
+
+# Build the parser
+try:
+ import pyshtables
+except ImportError:
+ yacc.yacc(tabmodule = 'pyshtables')
+else:
+ yacc.yacc(tabmodule = 'pysh.pyshtables', write_tables = 0, debug = 0)
+
+
+def parse(input, eof=False, debug=False):
+ """Parse a whole script at once and return the generated AST and unconsumed
+ data in a tuple.
+
+ NOTE: eof is probably meaningless for now, the parser being unable to work
+ in pull mode. It should be set to True.
+ """
+ lexer = pyshlex.PLYLexer()
+ remaining = lexer.add(input, eof)
+ if lexer.is_empty():
+ return [], remaining
+ if debug:
+ debug = 2
+ return yacc.parse(lexer=lexer, debug=debug), remaining
+
+#-------------------------------------------------------------------------------
+# AST rendering helpers
+#-------------------------------------------------------------------------------
+
+def format_commands(v):
+ """Return a tree made of strings and lists. Make command trees easier to
+ display.
+ """
+ if isinstance(v, list):
+ return [format_commands(c) for c in v]
+ if isinstance(v, tuple):
+ if len(v)==2 and isinstance(v[0], str) and not isinstance(v[1], str):
+ if v[0] == 'async':
+ return ['AsyncList', map(format_commands, v[1])]
+ else:
+ #Avoid decomposing tuples like ('pipeline', Pipeline(...))
+ return format_commands(v[1])
+ return format_commands(list(v))
+ elif isinstance(v, IfCond):
+ name = ['IfCond']
+ name += ['if', map(format_commands, v.cond)]
+ name += ['then', map(format_commands, v.if_cmds)]
+ name += ['else', map(format_commands, v.else_cmds)]
+ return name
+ elif isinstance(v, ForLoop):
+ name = ['ForLoop']
+ name += [repr(v.name)+' in ', map(str, v.items)]
+ name += ['commands', map(format_commands, v.cmds)]
+ return name
+ elif isinstance(v, AndOr):
+ return [v.op, format_commands(v.left), format_commands(v.right)]
+ elif isinstance(v, Pipeline):
+ name = 'Pipeline'
+ if v.reverse_status:
+ name = '!' + name
+ return [name, format_commands(v.commands)]
+ elif isinstance(v, SimpleCommand):
+ name = ['SimpleCommand']
+ if v.words:
+ name += ['words', map(str, v.words)]
+ if v.assigns:
+ assigns = [tuple(a[1]) for a in v.assigns]
+ name += ['assigns', map(str, assigns)]
+ if v.redirs:
+ name += ['redirs', map(format_commands, v.redirs)]
+ return name
+ elif isinstance(v, RedirectList):
+ name = ['RedirectList']
+ if v.redirs:
+ name += ['redirs', map(format_commands, v.redirs)]
+ name += ['command', format_commands(v.cmd)]
+ return name
+ elif isinstance(v, IORedirect):
+ return ' '.join(map(str, (v.io_number, v.op, v.filename)))
+ elif isinstance(v, HereDocument):
+ return ' '.join(map(str, (v.io_number, v.op, repr(v.name), repr(v.content))))
+ elif isinstance(v, SubShell):
+ return ['SubShell', map(format_commands, v.cmds)]
+ else:
+ return repr(v)
+
+def print_commands(cmds, output=sys.stdout):
+ """Pretty print a command tree."""
+ def print_tree(cmd, spaces, output):
+ if isinstance(cmd, list):
+ for c in cmd:
+ print_tree(c, spaces + 3, output)
+ else:
+ print >>output, ' '*spaces + str(cmd)
+
+ formatted = format_commands(cmds)
+ print_tree(formatted, 0, output)
+
+
+def stringify_commands(cmds):
+ """Serialize a command tree as a string.
+
+ Returned string is not pretty and is currently used for unit tests only.
+ """
+ def stringify(value):
+ output = []
+ if isinstance(value, list):
+ formatted = []
+ for v in value:
+ formatted.append(stringify(v))
+ formatted = ' '.join(formatted)
+ output.append(''.join(['<', formatted, '>']))
+ else:
+ output.append(value)
+ return ' '.join(output)
+
+ return stringify(format_commands(cmds))
+
+
+def visit_commands(cmds, callable):
+ """Visit the command tree and execute callable on every Pipeline and
+ SimpleCommand instances.
+ """
+ if isinstance(cmds, (tuple, list)):
+ map(lambda c: visit_commands(c,callable), cmds)
+ elif isinstance(cmds, (Pipeline, SimpleCommand)):
+ callable(cmds)
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-28 07:36:43 +0000