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# SPDX-License-Identifier: CC0-1.0
#
# Process javascript files and resolve dependencies between them
#
# This file is part of Haketilo
#
# Copyright (C) 2021, Wojtek Kosior
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the CC0 1.0 Universal License as published by
# the Creative Commons Corporation.
#
# This program 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
# CC0 1.0 Universal License for more details.
function read_file(filename,
imports_state, exports_state, line, record, result) {
imports_state = "not_started"
exports_state = "not_started"
do {
result = (getline line < filename)
if (result < 0) {
printf "error reading %s", filename
exit 1
}
if (imports_state == "started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?IMPORT[[:space:]]+[_a-zA-Z][_a-zA-Z0-9]*[[:space:]]*$/) {
record = line
sub(/^([[:space:]]*\*[[:space:]]+)?IMPORT[[:space:]]+/, "", record)
sub(/([[:space:]]+$)/, "", record)
imports[filename,++import_counts[filename]] = record
}
if (imports_state == "started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?IMPORTS_END[[:space:]]*$/)
imports_state = "finished"
if (imports_state == "not_started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?IMPORTS_START[[:space:]]*$/)
imports_state = "started"
if (exports_state == "started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?EXPORT[[:space:]]+[_a-zA-Z][_a-zA-Z0-9]*[[:space:]]*$/) {
record = line
sub(/^([[:space:]]*\*[[:space:]]+)?EXPORT[[:space:]]+/, "", record)
sub(/([[:space:]]+$)/, "", record)
if (record in exports) {
printf "ERROR: '%s' exported by both %s and %s\n",
exports[record], filename > "/dev/stderr"
}
provides[record] = filename
exports[filename,++export_counts[filename]] = record
}
if (exports_state == "started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?EXPORTS_END[[:space:]]*$/)
exports_state = "finished"
if (exports_state == "not_started" &&
line ~ /^([[:space:]]*\*[[:space:]]+)?EXPORTS_START[[:space:]]*$/)
exports_state = "started"
} while (result > 0)
if (imports_state == "started") {
printf "ERROR: Unclosed IMPORTS list in '%s'\n", filename \
> "/dev/stderr"
exit 1
}
if (exports_state == "started") {
printf "ERROR: Unclosed EXPORTS list in '%s'\n", filename \
> "/dev/stderr"
exit 1
}
close(filename)
}
function print_file(filename, line) {
while ((getline line < filename) > 0)
print(line)
close(filename)
}
function print_imports_code(filename, i, count, import_name) {
count = import_counts[filename]
for (i = 1; i <= count; i++) {
import_name = imports[filename,i]
printf "const %s = window.killtheweb.%s;\n", import_name, import_name
}
}
function print_exports_code(filename, i, count, export_name) {
count = export_counts[filename]
for (i = 1; i <= count; i++) {
export_name = exports[filename,i]
printf "window.killtheweb.%s = %s;\n", export_name, export_name
}
}
function wrap_file(filename) {
print "\"use strict\";\n\n({fun: (function() {\n"
print_imports_code(filename)
printf "\n\n"
print_file(filename)
printf "\n\n"
print_exports_code(filename)
print "\n})}).fun();"
}
function compute_dependencies(filename, i, count, import_name, next_file) {
if (processed[filename] == "used")
return 0
if (processed[filename] == "on_stack") {
printf "import loop on %s\n", filename > "/dev/stderr"
return 1
}
processed[filename] = "on_stack"
count = import_counts[filename]
for (i = 1; i <= count; i++) {
import_name = imports[filename,i]
if (!(import_name in provides)) {
printf "nothing exports %s, required by %s\n",
import_name, filename > "/dev/stderr"
return 1
}
if (compute_dependencies(provides[import_name]) > 0) {
printf "when satisfying %s for %s\n",
import_name, filename > "/dev/stderr"
return 1
}
}
processed[filename] = "used"
print filename
return 0
}
function print_usage() {
printf "usage: %2 compute_scripts.awk script_dependencies|wrapped_code FILENAME[...]\n",
ARGV[0] > "/dev/stderr"
exit 1
}
function mock_exports_init() {
provides["browser"] = "exports_init.js"
provides["is_chrome"] = "exports_init.js"
provides["is_mozilla"] = "exports_init.js"
processed["exports_init.js"] = "used"
}
BEGIN {
operation = ARGV[1]
if (ARGC < 3)
print_usage()
root_filename = ARGV[2]
for (i = 2; i < ARGC; i++)
filenames[ARGV[i]]
mock_exports_init()
for (filename in filenames) {
# A filename is allowed to appear multiple times in the list.
# Let's only process it once.
if (!(filename in processed))
read_file(filename)
processed[filename] = "not_used"
}
if (operation == "script_dependencies") {
print("exports_init.js")
if (compute_dependencies(root_filename) > 0)
exit 1
} else if (operation == "wrapped_code") {
wrap_file(root_filename)
} else {
print_usage()
}
}
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