File size: 4,215 Bytes
0f034b9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | #!/usr/bin/awk -f
# Copyright (c) 2020 International Business Machines Corporation
# Prepared by: Geert Janssen <geert@us.ibm.com>
# Expects a C/C++ tokenizer generated CSV file as input.
# (tokenize -m csv)
# Outputs one possibly modified token (class or literal) per line.
# Recognizes identifiers and checks them against a list of all standard
# C library functions (from /usr/include header files), CPP directives,
# and some other standard names like stdin, stdout, etc.
# Any other identifiers will simply output as the token class name identifier.
# Keywords are output as themselves, i.e., while is output as while.
# Integer and floating-point literals are collectively output as number.
# Character and string literals are output as their class.
# Some operators and punctuation are distinguished; all others output as
# operator.
# Preprocessor symbols are output as # resp. ##.
function dirname(pathname) {
if (!sub(/\/[^\/]*\/?$/, "", pathname))
return "."
return pathname
}
BEGIN {
# Read the file of all C standard function names, one per line
# 280
# Get directory where this script resides (ugly hack):
getline cmdline <("/proc/"PROCINFO["pid"]"/cmdline")
split(cmdline, fields, "\0")
path = dirname(fields[3])
input = path "/std-C-lib-funcs.txt"
while ((rc = (getline line < input)) > 0) {
standard[line]=1
}
close(input)
if (rc < 0)
print "(W) cannot open " input
# Add some other standard names:
# 20
standard["stdin"]=1
standard["stdout"]=1
standard["stderr"]=1
standard["main"]=1
standard["argv"]=1
standard["argc"]=1
standard["NULL"]=1
standard["FILE"]=1
standard["size_t"]=1
standard["ssize_t"]=1
standard["int8_t"]=1
standard["int16_t"]=1
standard["int32_t"]=1
standard["int64_t"]=1
standard["uint8_t"]=1
standard["uint16_t"]=1
standard["uint32_t"]=1
standard["uint64_t"]=1
standard["uintptr_t"]=1
standard["errno"]=1
# Let's throw in some C++ names as well:
# 11
standard["std"]=1
standard["cin"]=1
standard["cout"]=1
standard["cerr"]=1
standard["endl"]=1
standard["vector"]=1
standard["map"]=1
standard["string"]=1
standard["set"]=1
standard["queue"]=1
standard["ptrdiff_t"]=1
# Treat some CPP identifiers as keywords:
# 11
standard["include"]=1
standard["ifdef"]=1
standard["ifndef"]=1
standard["elif"]=1
standard["endif"]=1
standard["define"]=1
standard["undef"]=1
standard["defined"]=1
standard["__FILE__"]=1
standard["__LINE__"]=1
standard["pragma"]=1
# 16
punctuation = "[](){}<>;?::,...="
FS=","
# Skip header:
getline
}
{
# Read csv
# Vocabulary size:
# 5 class names: identifier, number, operator, character, string
# 95 C/C++20 keywords
# 280 standard functions
# 42 cpp and other standard names
# 16 punctuation symbols
# 2 preprocessor symbols # and ##
# 2 integer constants 0,1
# === +
# 442
# Check for identifier in column 3 (class)
if ($3 == "identifier") {
# Separate out certain identifiers:
if ($4 in standard)
print $4
else
# Maybe use a shorter identifier representative, like ident or id
print $3
}
else if ($3 == "operator") {
# Separate out certain punctuation:
if (index(punctuation, $4) != 0)
print $4
else
# Mind the escaped comma "," which is eaten by FS:
if ($4 == "\"" && $5 == "\"")
print ","
else
# Maybe use a real operator; need one that can be used
# prefix, infix, and postfix
print $3
}
else if ($3 == "keyword" || $3 == "preprocessor")
print $4
else if ($3 == "integer") {
# Allow some specific values: 0 and 1
# (minus sign is not part of number literal!)
if (index("0 1", $4) != 0)
print $4
else
# Maybe use an integer number representative, like 123
print "number"
}
else if ($3 == "floating")
# Consolidate integer and floating:
# Maybe use an integer number representative, like 123
print "number"
else # character or string
# Maybe use a real string "" and char literal 'A'
print $3
}
END {}
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