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author | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
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committer | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
commit | 21f9b84b4b729fbd7acbd465e7a3f726e4d20f91 (patch) | |
tree | eb2d091d427ca0813b445509d59cc8e27e8ad25f /yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py | |
parent | 101cef31e2bf54c678501155cd2106251acbd076 (diff) | |
parent | c124f4f2e04dca16a428a76c89677328bc7bf908 (diff) | |
download | openbmc-21f9b84b4b729fbd7acbd465e7a3f726e4d20f91.tar.xz |
Merge commit 'c124f4f2e04dca16a428a76c89677328bc7bf908' as 'yocto-poky'
Diffstat (limited to 'yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py')
-rw-r--r-- | yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py | 779 |
1 files changed, 779 insertions, 0 deletions
diff --git a/yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py b/yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py new file mode 100644 index 000000000..e8e80aac4 --- /dev/null +++ b/yocto-poky/bitbake/lib/bb/pysh/pyshyacc.py @@ -0,0 +1,779 @@ +# 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 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: + 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) |