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author | Mads Kiilerich <mads@kiilerich.com> |
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date | Wed, 28 Jun 2023 14:23:13 +0200 |
parents | d44e3c45f0e4 |
children |
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# dagparser.py - parser and generator for concise description of DAGs # # Copyright 2010 Peter Arrenbrecht <peter@arrenbrecht.ch> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import re import string from .i18n import _ from . import ( error, pycompat, ) from .utils import stringutil def parsedag(desc): '''parses a DAG from a concise textual description; generates events "+n" is a linear run of n nodes based on the current default parent "." is a single node based on the current default parent "$" resets the default parent to -1 (implied at the start); otherwise the default parent is always the last node created "<p" sets the default parent to the backref p "*p" is a fork at parent p, where p is a backref "*p1/p2/.../pn" is a merge of parents p1..pn, where the pi are backrefs "/p2/.../pn" is a merge of the preceding node and p2..pn ":name" defines a label for the preceding node; labels can be redefined "@text" emits an annotation event for text "!command" emits an action event for the current node "!!my command\n" is like "!", but to the end of the line "#...\n" is a comment up to the end of the line Whitespace between the above elements is ignored. A backref is either * a number n, which references the node curr-n, where curr is the current node, or * the name of a label you placed earlier using ":name", or * empty to denote the default parent. All string valued-elements are either strictly alphanumeric, or must be enclosed in double quotes ("..."), with "\" as escape character. Generates sequence of ('n', (id, [parentids])) for node creation ('l', (id, labelname)) for labels on nodes ('a', text) for annotations ('c', command) for actions (!) ('C', command) for line actions (!!) Examples -------- Example of a complex graph (output not shown for brevity): >>> len(list(parsedag(b""" ... ... +3 # 3 nodes in linear run ... :forkhere # a label for the last of the 3 nodes from above ... +5 # 5 more nodes on one branch ... :mergethis # label again ... <forkhere # set default parent to labeled fork node ... +10 # 10 more nodes on a parallel branch ... @stable # following nodes will be annotated as "stable" ... +5 # 5 nodes in stable ... !addfile # custom command; could trigger new file in next node ... +2 # two more nodes ... /mergethis # merge last node with labeled node ... +4 # 4 more nodes descending from merge node ... ... """))) 34 Empty list: >>> list(parsedag(b"")) [] A simple linear run: >>> list(parsedag(b"+3")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] Some non-standard ways to define such runs: >>> list(parsedag(b"+1+2")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] >>> list(parsedag(b"+1*1*")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] >>> list(parsedag(b"*")) [('n', (0, [-1]))] >>> list(parsedag(b"...")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] A fork and a join, using numeric back references: >>> list(parsedag(b"+2*2*/2")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] >>> list(parsedag(b"+2<2+1/2")) [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] Placing a label: >>> list(parsedag(b"+1 :mylabel +1")) [('n', (0, [-1])), ('l', (0, 'mylabel')), ('n', (1, [0]))] An empty label (silly, really): >>> list(parsedag(b"+1:+1")) [('n', (0, [-1])), ('l', (0, '')), ('n', (1, [0]))] Fork and join, but with labels instead of numeric back references: >>> list(parsedag(b"+1:f +1:p2 *f */p2")) [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), ('n', (2, [0])), ('n', (3, [2, 1]))] >>> list(parsedag(b"+1:f +1:p2 <f +1 /p2")) [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), ('n', (2, [0])), ('n', (3, [2, 1]))] Restarting from the root: >>> list(parsedag(b"+1 $ +1")) [('n', (0, [-1])), ('n', (1, [-1]))] Annotations, which are meant to introduce sticky state for subsequent nodes: >>> list(parsedag(b"+1 @ann +1")) [('n', (0, [-1])), ('a', 'ann'), ('n', (1, [0]))] >>> list(parsedag(b'+1 @"my annotation" +1')) [('n', (0, [-1])), ('a', 'my annotation'), ('n', (1, [0]))] Commands, which are meant to operate on the most recently created node: >>> list(parsedag(b"+1 !cmd +1")) [('n', (0, [-1])), ('c', 'cmd'), ('n', (1, [0]))] >>> list(parsedag(b'+1 !"my command" +1')) [('n', (0, [-1])), ('c', 'my command'), ('n', (1, [0]))] >>> list(parsedag(b'+1 !!my command line\\n +1')) [('n', (0, [-1])), ('C', 'my command line'), ('n', (1, [0]))] Comments, which extend to the end of the line: >>> list(parsedag(b'+1 # comment\\n+1')) [('n', (0, [-1])), ('n', (1, [0]))] Error: >>> try: list(parsedag(b'+1 bad')) ... except Exception as e: print(pycompat.sysstr(bytes(e))) invalid character in dag description: bad... ''' if not desc: return # pytype: disable=wrong-arg-types wordchars = pycompat.bytestr(string.ascii_letters + string.digits) # pytype: enable=wrong-arg-types labels = {} p1 = -1 r = 0 def resolve(ref): if not ref: return p1 # pytype: disable=wrong-arg-types elif ref[0] in pycompat.bytestr(string.digits): # pytype: enable=wrong-arg-types return r - int(ref) else: return labels[ref] chiter = pycompat.iterbytestr(desc) def nextch(): return next(chiter, b'\0') def nextrun(c, allow): s = b'' while c in allow: s += c c = nextch() return c, s def nextdelimited(c, limit, escape): s = b'' while c != limit: if c == escape: c = nextch() s += c c = nextch() return nextch(), s def nextstring(c): if c == b'"': return nextdelimited(nextch(), b'"', b'\\') else: return nextrun(c, wordchars) c = nextch() while c != b'\0': # pytype: disable=wrong-arg-types while c in pycompat.bytestr(string.whitespace): # pytype: enable=wrong-arg-types c = nextch() if c == b'.': yield b'n', (r, [p1]) p1 = r r += 1 c = nextch() elif c == b'+': # pytype: disable=wrong-arg-types c, digs = nextrun(nextch(), pycompat.bytestr(string.digits)) # pytype: enable=wrong-arg-types n = int(digs) for i in range(0, n): yield b'n', (r, [p1]) p1 = r r += 1 elif c in b'*/': if c == b'*': c = nextch() c, pref = nextstring(c) prefs = [pref] while c == b'/': c, pref = nextstring(nextch()) prefs.append(pref) ps = [resolve(ref) for ref in prefs] yield b'n', (r, ps) p1 = r r += 1 elif c == b'<': c, ref = nextstring(nextch()) p1 = resolve(ref) elif c == b':': c, name = nextstring(nextch()) labels[name] = p1 yield b'l', (p1, name) elif c == b'@': c, text = nextstring(nextch()) yield b'a', text elif c == b'!': c = nextch() if c == b'!': cmd = b'' c = nextch() while c not in b'\n\r\0': cmd += c c = nextch() yield b'C', cmd else: c, cmd = nextstring(c) yield b'c', cmd elif c == b'#': while c not in b'\n\r\0': c = nextch() elif c == b'$': p1 = -1 c = nextch() elif c == b'\0': return # in case it was preceded by whitespace else: s = b'' i = 0 while c != b'\0' and i < 10: s += c i += 1 c = nextch() raise error.Abort( _(b'invalid character in dag description: %s...') % s ) def dagtextlines( events, addspaces=True, wraplabels=False, wrapannotations=False, wrapcommands=False, wrapnonlinear=False, usedots=False, maxlinewidth=70, ): '''generates single lines for dagtext()''' def wrapstring(text): if re.match(b"^[0-9a-z]*$", text): return text return b'"' + text.replace(b'\\', b'\\\\').replace(b'"', b'\"') + b'"' def gen(): labels = {} run = 0 wantr = 0 needroot = False for kind, data in events: if kind == b'n': r, ps = data # sanity check if r != wantr: raise error.Abort(_(b"expected id %i, got %i") % (wantr, r)) if not ps: ps = [-1] else: for p in ps: if p >= r: raise error.Abort( _( b"parent id %i is larger than " b"current id %i" ) % (p, r) ) wantr += 1 # new root? p1 = r - 1 if len(ps) == 1 and ps[0] == -1: if needroot: if run: yield b'+%d' % run run = 0 if wrapnonlinear: yield b'\n' yield b'$' p1 = -1 else: needroot = True if len(ps) == 1 and ps[0] == p1: if usedots: yield b"." else: run += 1 else: if run: yield b'+%d' % run run = 0 if wrapnonlinear: yield b'\n' prefs = [] for p in ps: if p == p1: prefs.append(b'') elif p in labels: prefs.append(labels[p]) else: prefs.append(b'%d' % (r - p)) yield b'*' + b'/'.join(prefs) else: if run: yield b'+%d' % run run = 0 if kind == b'l': rid, name = data labels[rid] = name yield b':' + name if wraplabels: yield b'\n' elif kind == b'c': yield b'!' + wrapstring(data) if wrapcommands: yield b'\n' elif kind == b'C': yield b'!!' + data yield b'\n' elif kind == b'a': if wrapannotations: yield b'\n' yield b'@' + wrapstring(data) elif kind == b'#': yield b'#' + data yield b'\n' else: raise error.Abort( _(b"invalid event type in dag: ('%s', '%s')") % ( stringutil.escapestr(kind), stringutil.escapestr(data), ) ) if run: yield b'+%d' % run line = b'' for part in gen(): if part == b'\n': if line: yield line line = b'' else: if len(line) + len(part) >= maxlinewidth: yield line line = b'' elif addspaces and line and part != b'.': line += b' ' line += part if line: yield line def dagtext( dag, addspaces=True, wraplabels=False, wrapannotations=False, wrapcommands=False, wrapnonlinear=False, usedots=False, maxlinewidth=70, ): """generates lines of a textual representation for a dag event stream events should generate what parsedag() does, so: ('n', (id, [parentids])) for node creation ('l', (id, labelname)) for labels on nodes ('a', text) for annotations ('c', text) for commands ('C', text) for line commands ('!!') ('#', text) for comment lines Parent nodes must come before child nodes. Examples -------- Linear run: >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0]))]) '+2' Two roots: >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [-1]))]) '+1 $ +1' Fork and join: >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0])), (b'n', (2, [0])), ... (b'n', (3, [2, 1]))]) '+2 *2 */2' Fork and join with labels: >>> dagtext([(b'n', (0, [-1])), (b'l', (0, b'f')), (b'n', (1, [0])), ... (b'l', (1, b'p2')), (b'n', (2, [0])), (b'n', (3, [2, 1]))]) '+1 :f +1 :p2 *f */p2' Annotations: >>> dagtext([(b'n', (0, [-1])), (b'a', b'ann'), (b'n', (1, [0]))]) '+1 @ann +1' >>> dagtext([(b'n', (0, [-1])), ... (b'a', b'my annotation'), ... (b'n', (1, [0]))]) '+1 @"my annotation" +1' Commands: >>> dagtext([(b'n', (0, [-1])), (b'c', b'cmd'), (b'n', (1, [0]))]) '+1 !cmd +1' >>> dagtext([(b'n', (0, [-1])), ... (b'c', b'my command'), ... (b'n', (1, [0]))]) '+1 !"my command" +1' >>> dagtext([(b'n', (0, [-1])), ... (b'C', b'my command line'), ... (b'n', (1, [0]))]) '+1 !!my command line\\n+1' Comments: >>> dagtext([(b'n', (0, [-1])), (b'#', b' comment'), (b'n', (1, [0]))]) '+1 # comment\\n+1' >>> dagtext([]) '' Combining parsedag and dagtext: >>> dagtext(parsedag(b'+1 :f +1 :p2 *f */p2')) '+1 :f +1 :p2 *f */p2' """ return b"\n".join( dagtextlines( dag, addspaces, wraplabels, wrapannotations, wrapcommands, wrapnonlinear, usedots, maxlinewidth, ) )