| # 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 os.path |
| import sys |
| |
| import bb.pysh.pyshlex as pyshlex |
| tokens = pyshlex.tokens |
| |
| from ply import yacc |
| import bb.pysh.sherrors as 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 |
| if p: |
| w('%r\n' % p) |
| w('followed by:\n') |
| for i in range(5): |
| n = yacc.token() |
| if not n: |
| break |
| w(' %r\n' % n) |
| else: |
| w('Unexpected EOF') |
| raise sherrors.ShellSyntaxError(''.join(msg)) |
| |
| # Build the parser |
| try: |
| import pyshtables |
| except ImportError: |
| outputdir = os.path.dirname(__file__) |
| if not os.access(outputdir, os.W_OK): |
| outputdir = '' |
| yacc.yacc(tabmodule = 'pyshtables', outputdir = outputdir, debug = 0) |
| 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, Case): |
| name = ['Case'] |
| name += [v.name, format_commands(v.items)] |
| 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) |