330 lines
9.3 KiB
Python
330 lines
9.3 KiB
Python
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#!/usr/bin/env python3
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"""
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takes templated file .xxx.src and produces .xxx file where .xxx is
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.i or .c or .h, using the following template rules
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/**begin repeat -- on a line by itself marks the start of a repeated code
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segment
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/**end repeat**/ -- on a line by itself marks it's end
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After the /**begin repeat and before the */, all the named templates are placed
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these should all have the same number of replacements
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Repeat blocks can be nested, with each nested block labeled with its depth,
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i.e.
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/**begin repeat1
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*....
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*/
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/**end repeat1**/
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When using nested loops, you can optionally exclude particular
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combinations of the variables using (inside the comment portion of the inner loop):
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:exclude: var1=value1, var2=value2, ...
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This will exclude the pattern where var1 is value1 and var2 is value2 when
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the result is being generated.
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In the main body each replace will use one entry from the list of named replacements
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Note that all #..# forms in a block must have the same number of
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comma-separated entries.
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Example:
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An input file containing
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/**begin repeat
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* #a = 1,2,3#
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* #b = 1,2,3#
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*/
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/**begin repeat1
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* #c = ted, jim#
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*/
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@a@, @b@, @c@
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/**end repeat1**/
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/**end repeat**/
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produces
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line 1 "template.c.src"
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/*
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*********************************************************************
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** This file was autogenerated from a template DO NOT EDIT!!**
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** Changes should be made to the original source (.src) file **
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*********************************************************************
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*/
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#line 9
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1, 1, ted
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#line 9
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1, 1, jim
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#line 9
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2, 2, ted
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#line 9
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2, 2, jim
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#line 9
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3, 3, ted
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#line 9
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3, 3, jim
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"""
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__all__ = ['process_str', 'process_file']
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import os
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import sys
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import re
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# names for replacement that are already global.
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global_names = {}
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# header placed at the front of head processed file
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header =\
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"""
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/*
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*****************************************************************************
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** This file was autogenerated from a template DO NOT EDIT!!!! **
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** Changes should be made to the original source (.src) file **
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*****************************************************************************
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*/
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"""
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# Parse string for repeat loops
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def parse_structure(astr, level):
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"""
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The returned line number is from the beginning of the string, starting
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at zero. Returns an empty list if no loops found.
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"""
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if level == 0 :
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loopbeg = "/**begin repeat"
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loopend = "/**end repeat**/"
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else :
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loopbeg = "/**begin repeat%d" % level
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loopend = "/**end repeat%d**/" % level
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ind = 0
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line = 0
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spanlist = []
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while True:
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start = astr.find(loopbeg, ind)
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if start == -1:
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break
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start2 = astr.find("*/", start)
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start2 = astr.find("\n", start2)
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fini1 = astr.find(loopend, start2)
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fini2 = astr.find("\n", fini1)
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line += astr.count("\n", ind, start2+1)
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spanlist.append((start, start2+1, fini1, fini2+1, line))
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line += astr.count("\n", start2+1, fini2)
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ind = fini2
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spanlist.sort()
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return spanlist
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def paren_repl(obj):
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torep = obj.group(1)
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numrep = obj.group(2)
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return ','.join([torep]*int(numrep))
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parenrep = re.compile(r"\(([^)]*)\)\*(\d+)")
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plainrep = re.compile(r"([^*]+)\*(\d+)")
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def parse_values(astr):
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# replaces all occurrences of '(a,b,c)*4' in astr
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# with 'a,b,c,a,b,c,a,b,c,a,b,c'. Empty braces generate
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# empty values, i.e., ()*4 yields ',,,'. The result is
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# split at ',' and a list of values returned.
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astr = parenrep.sub(paren_repl, astr)
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# replaces occurrences of xxx*3 with xxx, xxx, xxx
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astr = ','.join([plainrep.sub(paren_repl, x.strip())
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for x in astr.split(',')])
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return astr.split(',')
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stripast = re.compile(r"\n\s*\*?")
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named_re = re.compile(r"#\s*(\w*)\s*=([^#]*)#")
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exclude_vars_re = re.compile(r"(\w*)=(\w*)")
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exclude_re = re.compile(":exclude:")
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def parse_loop_header(loophead) :
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"""Find all named replacements in the header
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Returns a list of dictionaries, one for each loop iteration,
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where each key is a name to be substituted and the corresponding
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value is the replacement string.
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Also return a list of exclusions. The exclusions are dictionaries
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of key value pairs. There can be more than one exclusion.
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[{'var1':'value1', 'var2', 'value2'[,...]}, ...]
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"""
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# Strip out '\n' and leading '*', if any, in continuation lines.
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# This should not effect code previous to this change as
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# continuation lines were not allowed.
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loophead = stripast.sub("", loophead)
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# parse out the names and lists of values
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names = []
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reps = named_re.findall(loophead)
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nsub = None
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for rep in reps:
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name = rep[0]
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vals = parse_values(rep[1])
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size = len(vals)
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if nsub is None :
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nsub = size
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elif nsub != size :
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msg = "Mismatch in number of values, %d != %d\n%s = %s"
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raise ValueError(msg % (nsub, size, name, vals))
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names.append((name, vals))
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# Find any exclude variables
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excludes = []
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for obj in exclude_re.finditer(loophead):
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span = obj.span()
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# find next newline
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endline = loophead.find('\n', span[1])
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substr = loophead[span[1]:endline]
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ex_names = exclude_vars_re.findall(substr)
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excludes.append(dict(ex_names))
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# generate list of dictionaries, one for each template iteration
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dlist = []
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if nsub is None :
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raise ValueError("No substitution variables found")
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for i in range(nsub):
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tmp = {name: vals[i] for name, vals in names}
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dlist.append(tmp)
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return dlist
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replace_re = re.compile(r"@(\w+)@")
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def parse_string(astr, env, level, line) :
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lineno = "#line %d\n" % line
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# local function for string replacement, uses env
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def replace(match):
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name = match.group(1)
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try :
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val = env[name]
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except KeyError:
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msg = 'line %d: no definition of key "%s"'%(line, name)
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raise ValueError(msg) from None
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return val
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code = [lineno]
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struct = parse_structure(astr, level)
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if struct :
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# recurse over inner loops
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oldend = 0
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newlevel = level + 1
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for sub in struct:
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pref = astr[oldend:sub[0]]
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head = astr[sub[0]:sub[1]]
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text = astr[sub[1]:sub[2]]
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oldend = sub[3]
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newline = line + sub[4]
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code.append(replace_re.sub(replace, pref))
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try :
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envlist = parse_loop_header(head)
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except ValueError as e:
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msg = "line %d: %s" % (newline, e)
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raise ValueError(msg)
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for newenv in envlist :
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newenv.update(env)
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newcode = parse_string(text, newenv, newlevel, newline)
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code.extend(newcode)
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suff = astr[oldend:]
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code.append(replace_re.sub(replace, suff))
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else :
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# replace keys
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code.append(replace_re.sub(replace, astr))
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code.append('\n')
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return ''.join(code)
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def process_str(astr):
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code = [header]
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code.extend(parse_string(astr, global_names, 0, 1))
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return ''.join(code)
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include_src_re = re.compile(r"(\n|\A)#include\s*['\"]"
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r"(?P<name>[\w\d./\\]+[.]src)['\"]", re.I)
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def resolve_includes(source):
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d = os.path.dirname(source)
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with open(source) as fid:
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lines = []
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for line in fid:
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m = include_src_re.match(line)
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if m:
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fn = m.group('name')
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if not os.path.isabs(fn):
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fn = os.path.join(d, fn)
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if os.path.isfile(fn):
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lines.extend(resolve_includes(fn))
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else:
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lines.append(line)
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else:
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lines.append(line)
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return lines
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def process_file(source):
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lines = resolve_includes(source)
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sourcefile = os.path.normcase(source).replace("\\", "\\\\")
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try:
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code = process_str(''.join(lines))
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except ValueError as e:
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raise ValueError('In "%s" loop at %s' % (sourcefile, e)) from None
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return '#line 1 "%s"\n%s' % (sourcefile, code)
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def unique_key(adict):
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# this obtains a unique key given a dictionary
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# currently it works by appending together n of the letters of the
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# current keys and increasing n until a unique key is found
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# -- not particularly quick
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allkeys = list(adict.keys())
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done = False
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n = 1
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while not done:
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newkey = "".join([x[:n] for x in allkeys])
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if newkey in allkeys:
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n += 1
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else:
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done = True
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return newkey
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def main():
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try:
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file = sys.argv[1]
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except IndexError:
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fid = sys.stdin
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outfile = sys.stdout
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else:
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fid = open(file, 'r')
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(base, ext) = os.path.splitext(file)
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newname = base
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outfile = open(newname, 'w')
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allstr = fid.read()
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try:
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writestr = process_str(allstr)
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except ValueError as e:
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raise ValueError("In %s loop at %s" % (file, e)) from None
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outfile.write(writestr)
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if __name__ == "__main__":
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main()
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