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Diffstat (limited to 'libguile/unidata_to_charset.awk')
| -rw-r--r-- | libguile/unidata_to_charset.awk | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/libguile/unidata_to_charset.awk b/libguile/unidata_to_charset.awk new file mode 100644 index 000000000..11dfb2686 --- /dev/null +++ b/libguile/unidata_to_charset.awk @@ -0,0 +1,409 @@ +# unidata_to_charset.awk --- Compute SRFI-14 charsets from UnicodeData.txt +# +# Copyright (C) 2009, 2010, 2022 Free Software Foundation, Inc. +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 3 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +# Utilities +########### + +# Print MESSAGE to standard error, and exit with STATUS. +function die(status, message) { + print "unidata_to_charset.awk:", message | "cat 1>&2"; + exit_status = status; + exit exit_status; +} + +# Parse the string S as a hexadecimal number. Note that R, C, and B are +# local variables that need not be set by callers. Most Awk +# implementations have an 'strtonum' function that we could use, but it +# is not part of POSIX. +function hex(s, r, c, b) { + if (length(s) == 0) { + die(1, "Cannot parse empty string as hexadecimal."); + } + r = 0; + for (i = 1; i <= length(s); i++) { + c = substr(s, i, 1); + b = 0; + if (c == "0") { b = 0; } + else if (c == "1") { b = 1; } + else if (c == "2") { b = 2; } + else if (c == "3") { b = 3; } + else if (c == "4") { b = 4; } + else if (c == "5") { b = 5; } + else if (c == "6") { b = 6; } + else if (c == "7") { b = 7; } + else if (c == "8") { b = 8; } + else if (c == "9") { b = 9; } + else if (c == "A") { b = 10; } + else if (c == "B") { b = 11; } + else if (c == "C") { b = 12; } + else if (c == "D") { b = 13; } + else if (c == "E") { b = 14; } + else if (c == "F") { b = 15; } + else { die(1, "Invalid hexadecimal character: " c); } + r *= 16; + r += b; + } + return r; +} + +# Program initialization +######################## + +BEGIN { + # The columns are separated by semicolons. + FS = ";"; + + # This will help us handle errors. + exit_status = 0; + + # List of charsets. + all_charsets_count = 0; + all_charsets[all_charsets_count++] = "lower_case"; + all_charsets[all_charsets_count++] = "upper_case"; + all_charsets[all_charsets_count++] = "title_case"; + all_charsets[all_charsets_count++] = "letter"; + all_charsets[all_charsets_count++] = "digit"; + all_charsets[all_charsets_count++] = "hex_digit"; + all_charsets[all_charsets_count++] = "letter_plus_digit"; + all_charsets[all_charsets_count++] = "graphic"; + all_charsets[all_charsets_count++] = "whitespace"; + all_charsets[all_charsets_count++] = "printing"; + all_charsets[all_charsets_count++] = "iso_control"; + all_charsets[all_charsets_count++] = "punctuation"; + all_charsets[all_charsets_count++] = "symbol"; + all_charsets[all_charsets_count++] = "blank"; + all_charsets[all_charsets_count++] = "ascii"; + all_charsets[all_charsets_count++] = "empty"; + all_charsets[all_charsets_count++] = "designated"; + + # Initialize charset state table. + for (i in all_charsets) { + cs = all_charsets[i]; + state[cs, "start"] = -1; + state[cs, "end"] = -1; + state[cs, "count"] = 0; + } +} + +# Record initialization +####################### + +# In this block we give names to each field, and do some basic +# initialization. +{ + codepoint = hex($1); + name = $2; + category = $3; + uppercase = $13; + lowercase = $14; + + codepoint_end = codepoint; + charset_count = 0; +} + +# Some pairs of lines in UnicodeData.txt delimit ranges of +# characters. +name ~ /First>$/ { + getline; + last_name = name; + sub(/First>$/, "Last>", last_name); + if (last_name != $2) { + die(1, "Invalid range in Unicode data."); + exit_status = 1; + exit 1; + } + codepoint_end = hex($1); +} + +# Character set predicates +########################## + +## The lower_case character set +############################### + +# For Unicode, we follow Java's specification: a character is +# lowercase if +# * it is not in the range [U+2000,U+2FFF] ([8192,12287]), and +# * the Unicode attribute table does not give a lowercase mapping +# for it, and +# * at least one of the following is true: +# o the Unicode attribute table gives a mapping to uppercase +# for the character, or +# o the name for the character in the Unicode attribute table +# contains the words "SMALL LETTER" or "SMALL LIGATURE". + +(codepoint < 8192 || codepoint > 12287) && +lowercase == "" && +(uppercase != "" || name ~ /(SMALL LETTER|SMALL LIGATURE)/) { + charsets[charset_count++] = "lower_case"; +} + +## The upper_case character set +############################### + +# For Unicode, we follow Java's specification: a character is +# uppercase if +# * it is not in the range [U+2000,U+2FFF] ([8192,12287]), and +# * the Unicode attribute table does not give an uppercase mapping +# for it (this excludes titlecase characters), and +# * at least one of the following is true: +# o the Unicode attribute table gives a mapping to lowercase +# for the character, or +# o the name for the character in the Unicode attribute table +# contains the words "CAPITAL LETTER" or "CAPITAL LIGATURE". + +(codepoint < 8192 || codepoint > 12287) && +uppercase == "" && +(lowercase != "" || name ~ /(CAPITAL LETTER|CAPITAL LIGATURE)/) { + charsets[charset_count++] = "upper_case"; +} + +## The title_case character set +############################### + +# A character is titlecase if it has the category Lt in the character +# attribute database. + +category == "Lt" { + charsets[charset_count++] = "title_case"; +} + +## The letter character set +########################### + +# A letter is any character with one of the letter categories (Lu, Ll, +# Lt, Lm, Lo) in the Unicode character database. + +category == "Lu" || +category == "Ll" || +category == "Lt" || +category == "Lm" || +category == "Lo" { + charsets[charset_count++] = "letter"; + charsets[charset_count++] = "letter_plus_digit"; +} + +## The digit character set +########################## + +# A character is a digit if it has the category Nd in the character +# attribute database. In Latin-1 and ASCII, the only such characters +# are 0123456789. In Unicode, there are other digit characters in +# other code blocks, such as Gujarati digits and Tibetan digits. + +category == "Nd" { + charsets[charset_count++] = "digit"; + charsets[charset_count++] = "letter_plus_digit"; +} + +## The hex_digit character set +############################## + +# The only hex digits are 0123456789abcdefABCDEF. + +(codepoint >= 48 && codepoint <= 57) || +(codepoint >= 65 && codepoint <= 70) || +(codepoint >= 97 && codepoint <= 102) { + charsets[charset_count++] = "hex_digit"; +} + +## The graphic character set +############################ + +# Characters that would 'use ink' when printed + +category ~ /L|M|N|P|S/ { + charsets[charset_count++] = "graphic"; + charsets[charset_count++] = "printing"; +} + +## The whitespace character set +############################### + +# A whitespace character is either +# * a character with one of the space, line, or paragraph separator +# categories (Zs, Zl or Zp) of the Unicode character database. +# * U+0009 (09) Horizontal tabulation (\t control-I) +# * U+000A (10) Line feed (\n control-J) +# * U+000B (11) Vertical tabulation (\v control-K) +# * U+000C (12) Form feed (\f control-L) +# * U+000D (13) Carriage return (\r control-M) + +category ~ /Zs|Zl|Zp/ || +(codepoint >= 9 && codepoint <= 13) { + charsets[charset_count++] = "whitespace"; + charsets[charset_count++] = "printing"; +} + +## The iso_control character set +################################ + +# The ISO control characters are the Unicode/Latin-1 characters in the +# ranges [U+0000,U+001F] ([0,31]) and [U+007F,U+009F] ([127,159]). + +(codepoint >= 0 && codepoint <= 31) || +(codepoint >= 127 && codepoint <= 159) { + charsets[charset_count++] = "iso_control"; +} + +## The punctuation character set +################################ + +# A punctuation character is any character that has one of the +# punctuation categories in the Unicode character database (Pc, Pd, +# Ps, Pe, Pi, Pf, or Po.) + +# Note that srfi-14 gives conflicting requirements!! It claims that +# only the Unicode punctuation is necessary, but, explicitly calls out +# the soft hyphen character (U+00AD) as punctution. Current versions +# of Unicode consider U+00AD to be a formatting character, not +# punctuation. + +category ~ /P/ { + charsets[charset_count++] = "punctuation"; +} + +## The symbol character set +########################### + +# A symbol is any character that has one of the symbol categories in +# the Unicode character database (Sm, Sc, Sk, or So). + +category ~ /S/ { + charsets[charset_count++] = "symbol"; +} + +## The blank character set +########################## + +# Blank chars are horizontal whitespace. A blank character is either +# * a character with the space separator category (Zs) in the +# Unicode character database. +# * U+0009 (9) Horizontal tabulation (\t control-I) + +category ~ /Zs/ || codepoint == 9 { + charsets[charset_count++] = "blank"; +} + +## The ascii character set +########################## + +codepoint <= 127 { + charsets[charset_count++] = "ascii"; +} + +## The designated character set +############################### + +# Designated -- All characters except for the surrogates + +category !~ /Cs/ { + charsets[charset_count++] = "designated"; +} + +## Other character sets +####################### + +# Note that the "letter_plus_digit" and "printing" character sets, which +# are unions of other character sets, are included in the patterns +# matching their constituent parts (i.e., the "letter_plus_digit" +# character set is included as part of the "letter" and "digit" +# patterns). +# +# Also, the "empty" character is computed by doing precisely nothing! + +# Keeping track of state +######################## + +# Update the state for each charset. +{ + for (i = 0; i < charset_count; i++) { + cs = charsets[i]; + if (state[cs, "start"] == -1) { + state[cs, "start"] = codepoint; + state[cs, "end"] = codepoint_end; + } else if (state[cs, "end"] + 1 == codepoint) { + state[cs, "end"] = codepoint_end; + } else { + count = state[cs, "count"]; + state[cs, "count"]++; + state[cs, "ranges", count, 0] = state[cs, "start"]; + state[cs, "ranges", count, 1] = state[cs, "end"]; + state[cs, "start"] = codepoint; + state[cs, "end"] = codepoint_end; + } + } +} + +# Printing and error handling +############################# + +END { + # Normally, an exit statement runs all the 'END' blocks before + # actually exiting. We use the 'exit_status' variable to short + # circuit the rest of the 'END' block by reissuing the exit + # statement. + if (exit_status != 0) { + exit exit_status; + } + + # Write a bit of a header. + print("/* srfi-14.i.c -- standard SRFI-14 character set data */"); + print(""); + print("/* This file is #include'd by srfi-14.c. */"); + print(""); + print("/* This file was generated from"); + print(" https://unicode.org/Public/UNIDATA/UnicodeData.txt"); + print(" with the unidata_to_charset.awk script. */"); + print(""); + + for (i = 0; i < all_charsets_count; i++) { + cs = all_charsets[i]; + + # Extra logic to ensure that the last range is included. + if (state[cs, "start"] != -1) { + count = state[cs, "count"]; + state[cs, "count"]++; + state[cs, "ranges", count, 0] = state[cs, "start"]; + state[cs, "ranges", count, 1] = state[cs, "end"]; + } + + count = state[cs, "count"]; + + print("static const scm_t_char_range cs_" cs "_ranges[] = {"); + for (j = 0; j < count; j++) { + rstart = state[cs, "ranges", j, 0]; + rend = state[cs, "ranges", j, 1]; + if (j + 1 < count) { + printf(" {0x%04x, 0x%04x},\n", rstart, rend); + } else { + printf(" {0x%04x, 0x%04x}\n", rstart, rend); + } + } + print("};"); + print(""); + + count = state[cs, "count"]; + printf("static const size_t cs_%s_len = %d;\n", cs, count); + if (i + 1 < all_charsets_count) { + print(""); + } + } +} + +# And we're done. |