Mercurial > hg
view mercurial/filesetlang.py @ 45551:4c8d9b53b1c7
chg: make is possible to call by default an hg binary located next to chg
When a single version of hg is in use and it's in the PATH, using chg
is just a matter of calling chg.
But when there are multiple installations of hg+chg around, and hg is
referred to with an absolute path, using chg is more annoying because
it requires both changing the invocation to hg to use chg, but also
setting CHGHG.
Currently, we set HGPATH when we build chg to remove the need to set
CHGHG in the previous paragraph. But that means chg now hardcodes its
installation path, which makes the installation not relocatable. Hence
this proposal to make chg find ./hg relative to itself (as opposed to
CHGHG=./hg which find hg relative to cwd).
This only works on linux as written, but since it's opt-in, it sounds
fine.
Tested by hand, as I'm not sure how else to test this.
Differential Revision: https://phab.mercurial-scm.org/D9006
author | Valentin Gatien-Baron <vgatien-baron@janestreet.com> |
---|---|
date | Thu, 03 Sep 2020 11:07:47 -0400 |
parents | c59eb1560c44 |
children | d4ba4d51f85f |
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# filesetlang.py - parser, tokenizer and utility for file set language # # Copyright 2010 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import from .i18n import _ from .pycompat import getattr from . import ( error, parser, pycompat, ) # common weight constants for static optimization # (see registrar.filesetpredicate for details) WEIGHT_CHECK_FILENAME = 0.5 WEIGHT_READ_CONTENTS = 30 WEIGHT_STATUS = 10 WEIGHT_STATUS_THOROUGH = 50 elements = { # token-type: binding-strength, primary, prefix, infix, suffix b"(": (20, None, (b"group", 1, b")"), (b"func", 1, b")"), None), b":": (15, None, None, (b"kindpat", 15), None), b"-": (5, None, (b"negate", 19), (b"minus", 5), None), b"not": (10, None, (b"not", 10), None, None), b"!": (10, None, (b"not", 10), None, None), b"and": (5, None, None, (b"and", 5), None), b"&": (5, None, None, (b"and", 5), None), b"or": (4, None, None, (b"or", 4), None), b"|": (4, None, None, (b"or", 4), None), b"+": (4, None, None, (b"or", 4), None), b",": (2, None, None, (b"list", 2), None), b")": (0, None, None, None, None), b"symbol": (0, b"symbol", None, None, None), b"string": (0, b"string", None, None, None), b"end": (0, None, None, None, None), } keywords = {b'and', b'or', b'not'} symbols = {} globchars = b".*{}[]?/\\_" def tokenize(program): pos, l = 0, len(program) program = pycompat.bytestr(program) while pos < l: c = program[pos] if c.isspace(): # skip inter-token whitespace pass elif c in b"(),-:|&+!": # handle simple operators yield (c, None, pos) elif ( c in b'"\'' or c == b'r' and program[pos : pos + 2] in (b"r'", b'r"') ): # handle quoted strings if c == b'r': pos += 1 c = program[pos] decode = lambda x: x else: decode = parser.unescapestr pos += 1 s = pos while pos < l: # find closing quote d = program[pos] if d == b'\\': # skip over escaped characters pos += 2 continue if d == c: yield (b'string', decode(program[s:pos]), s) break pos += 1 else: raise error.ParseError(_(b"unterminated string"), s) elif c.isalnum() or c in globchars or ord(c) > 127: # gather up a symbol/keyword s = pos pos += 1 while pos < l: # find end of symbol d = program[pos] if not (d.isalnum() or d in globchars or ord(d) > 127): break pos += 1 sym = program[s:pos] if sym in keywords: # operator keywords yield (sym, None, s) else: yield (b'symbol', sym, s) pos -= 1 else: raise error.ParseError(_(b"syntax error"), pos) pos += 1 yield (b'end', None, pos) def parse(expr): p = parser.parser(elements) tree, pos = p.parse(tokenize(expr)) if pos != len(expr): raise error.ParseError(_(b"invalid token"), pos) return parser.simplifyinfixops(tree, {b'list', b'or'}) def getsymbol(x): if x and x[0] == b'symbol': return x[1] raise error.ParseError(_(b'not a symbol')) def getstring(x, err): if x and (x[0] == b'string' or x[0] == b'symbol'): return x[1] raise error.ParseError(err) def getkindpat(x, y, allkinds, err): kind = getsymbol(x) pat = getstring(y, err) if kind not in allkinds: raise error.ParseError(_(b"invalid pattern kind: %s") % kind) return b'%s:%s' % (kind, pat) def getpattern(x, allkinds, err): if x and x[0] == b'kindpat': return getkindpat(x[1], x[2], allkinds, err) return getstring(x, err) def getlist(x): if not x: return [] if x[0] == b'list': return list(x[1:]) return [x] def getargs(x, min, max, err): l = getlist(x) if len(l) < min or len(l) > max: raise error.ParseError(err) return l def _analyze(x): if x is None: return x op = x[0] if op in {b'string', b'symbol'}: return x if op == b'kindpat': getsymbol(x[1]) # kind must be a symbol t = _analyze(x[2]) return (op, x[1], t) if op == b'group': return _analyze(x[1]) if op == b'negate': raise error.ParseError(_(b"can't use negate operator in this context")) if op == b'not': t = _analyze(x[1]) return (op, t) if op == b'and': ta = _analyze(x[1]) tb = _analyze(x[2]) return (op, ta, tb) if op == b'minus': return _analyze((b'and', x[1], (b'not', x[2]))) if op in {b'list', b'or'}: ts = tuple(_analyze(y) for y in x[1:]) return (op,) + ts if op == b'func': getsymbol(x[1]) # function name must be a symbol ta = _analyze(x[2]) return (op, x[1], ta) raise error.ProgrammingError(b'invalid operator %r' % op) def _insertstatushints(x): """Insert hint nodes where status should be calculated (first path) This works in bottom-up way, summing up status names and inserting hint nodes at 'and' and 'or' as needed. Thus redundant hint nodes may be left. Returns (status-names, new-tree) at the given subtree, where status-names is a sum of status names referenced in the given subtree. """ if x is None: return (), x op = x[0] if op in {b'string', b'symbol', b'kindpat'}: return (), x if op == b'not': h, t = _insertstatushints(x[1]) return h, (op, t) if op == b'and': ha, ta = _insertstatushints(x[1]) hb, tb = _insertstatushints(x[2]) hr = ha + hb if ha and hb: return hr, (b'withstatus', (op, ta, tb), (b'string', b' '.join(hr))) return hr, (op, ta, tb) if op == b'or': hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) hr = sum(hs, ()) if sum(bool(h) for h in hs) > 1: return hr, (b'withstatus', (op,) + ts, (b'string', b' '.join(hr))) return hr, (op,) + ts if op == b'list': hs, ts = zip(*(_insertstatushints(y) for y in x[1:])) return sum(hs, ()), (op,) + ts if op == b'func': f = getsymbol(x[1]) # don't propagate 'ha' crossing a function boundary ha, ta = _insertstatushints(x[2]) if getattr(symbols.get(f), '_callstatus', False): return (f,), (b'withstatus', (op, x[1], ta), (b'string', f)) return (), (op, x[1], ta) raise error.ProgrammingError(b'invalid operator %r' % op) def _mergestatushints(x, instatus): """Remove redundant status hint nodes (second path) This is the top-down path to eliminate inner hint nodes. """ if x is None: return x op = x[0] if op == b'withstatus': if instatus: # drop redundant hint node return _mergestatushints(x[1], instatus) t = _mergestatushints(x[1], instatus=True) return (op, t, x[2]) if op in {b'string', b'symbol', b'kindpat'}: return x if op == b'not': t = _mergestatushints(x[1], instatus) return (op, t) if op == b'and': ta = _mergestatushints(x[1], instatus) tb = _mergestatushints(x[2], instatus) return (op, ta, tb) if op in {b'list', b'or'}: ts = tuple(_mergestatushints(y, instatus) for y in x[1:]) return (op,) + ts if op == b'func': # don't propagate 'instatus' crossing a function boundary ta = _mergestatushints(x[2], instatus=False) return (op, x[1], ta) raise error.ProgrammingError(b'invalid operator %r' % op) def analyze(x): """Transform raw parsed tree to evaluatable tree which can be fed to optimize() or getmatch() All pseudo operations should be mapped to real operations or functions defined in methods or symbols table respectively. """ t = _analyze(x) _h, t = _insertstatushints(t) return _mergestatushints(t, instatus=False) def _optimizeandops(op, ta, tb): if tb is not None and tb[0] == b'not': return (b'minus', ta, tb[1]) return (op, ta, tb) def _optimizeunion(xs): # collect string patterns so they can be compiled into a single regexp ws, ts, ss = [], [], [] for x in xs: w, t = _optimize(x) if t is not None and t[0] in {b'string', b'symbol', b'kindpat'}: ss.append(t) continue ws.append(w) ts.append(t) if ss: ws.append(WEIGHT_CHECK_FILENAME) ts.append((b'patterns',) + tuple(ss)) return ws, ts def _optimize(x): if x is None: return 0, x op = x[0] if op == b'withstatus': w, t = _optimize(x[1]) return w, (op, t, x[2]) if op in {b'string', b'symbol'}: return WEIGHT_CHECK_FILENAME, x if op == b'kindpat': w, t = _optimize(x[2]) return w, (op, x[1], t) if op == b'not': w, t = _optimize(x[1]) return w, (op, t) if op == b'and': wa, ta = _optimize(x[1]) wb, tb = _optimize(x[2]) if wa <= wb: return wa, _optimizeandops(op, ta, tb) else: return wb, _optimizeandops(op, tb, ta) if op == b'or': ws, ts = _optimizeunion(x[1:]) if len(ts) == 1: return ws[0], ts[0] # 'or' operation is fully optimized out ts = tuple( it[1] for it in sorted(enumerate(ts), key=lambda it: ws[it[0]]) ) return max(ws), (op,) + ts if op == b'list': ws, ts = zip(*(_optimize(y) for y in x[1:])) return sum(ws), (op,) + ts if op == b'func': f = getsymbol(x[1]) w = getattr(symbols.get(f), '_weight', 1) wa, ta = _optimize(x[2]) return w + wa, (op, x[1], ta) raise error.ProgrammingError(b'invalid operator %r' % op) def optimize(x): """Reorder/rewrite evaluatable tree for optimization All pseudo operations should be transformed beforehand. """ _w, t = _optimize(x) return t def prettyformat(tree): return parser.prettyformat(tree, (b'string', b'symbol'))