116 lines
4.2 KiB
Text
116 lines
4.2 KiB
Text
# Reads and returns a complete file as a string
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var readfile = func(file) {
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if((var st = stat(file)) == nil) die("Cannot stat file: " ~ file);
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var sz = st[7];
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var buf = bits.buf(sz);
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read(open(file), buf, sz);
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return buf;
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}
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# Generates a stat() test routine that is passed the "mode" field
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# (stat(...)[2]) from a stat() call (index 2), extracts the IFMT
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# subfield and compares it with the given type, assumes S_IFMT ==
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# 0xf000.
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var _gen_ifmt_test = func(ifmt) {
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func(stat_mode) {
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var buf = bits.buf(2);
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bits.setfld(buf, 0, 16, stat_mode);
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return ifmt == bits.fld(buf, 12, 4);
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}
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}
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# Generate file type test predicates isdir(), isreg(), islnk(), etc.
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# Usage: var s = io.stat(filename); # nil -> doesn't exist, broken link
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# if (s != nil and io.isdir(s[2])) { ... }
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var ifmts = {dir:4, reg:8, lnk:10, sock:12, fifo:1, blk:6, chr:2};
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foreach(fmt; keys(ifmts))
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caller(0)[0]["is" ~ fmt] = _gen_ifmt_test(ifmts[fmt]);
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# The following two functions are for reading generic XML files into
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# the property tree and for writing them from there to the disk. The
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# built-in fgcommands (load, save, loadxml, savexml) are for FlightGear's
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# own <PropertyList> XML files only, as they only handle a limited
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# number of very specific attributes. The io.readxml() loader turns
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# attributes into regular children with a configurable prefix prepended
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# to their name, while io.writexml() turns such nodes back into
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# attributes. The two functions have their own limitations, but can
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# easily get extended to whichever needs. The underlying parsexml()
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# command will handle any XML file.
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# Reads an XML file from an absolute path and returns it as property
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# tree. All nodes will be of type STRING. Data are only written to
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# leafs. Attributes are written as regular nodes with the optional
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# prefix prepended to the name. If the prefix is nil, then attributes
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# are ignored. Returns nil on error.
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#
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var readxml = func(path, prefix = "___") {
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var stack = [[{}, ""]];
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var node = props.Node.new();
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var tree = node; # prevent GC
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var start = func(name, attr) {
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var index = stack[-1][0];
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if(!contains(index, name))
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index[name] = 0;
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node = node.getChild(name, index[name], 1);
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if(prefix != nil)
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foreach(var n; keys(attr))
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node.getNode(prefix ~ n, 1).setValue(attr[n]);
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index[name] += 1;
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append(stack, [{}, ""]);
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}
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var end = func(name) {
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var buf = pop(stack);
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if(!size(buf[0]) and size(buf[1]))
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node.setValue(buf[1]);
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node = node.getParent();
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}
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var data = func(d) {
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stack[-1][1] ~= d;
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}
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return parsexml(path, start, end, data) == nil ? nil : tree;
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}
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# Writes a property tree as returned by readxml() to a file. Children
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# with name starting with <prefix> are again turned into attributes of
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# their parent. <node> must contain exactly one child, which will
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# become the XML file's outermost element.
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#
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var writexml = func(path, node, indent = "\t", prefix = "___") {
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var root = node.getChildren();
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if(!size(root))
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die("writexml(): tree doesn't have a root node");
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if(substr(path, -4) != ".xml")
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path ~= ".xml";
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var file = open(path, "w");
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write(file, "<?xml version=\"1.0\"?>\n\n");
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var writenode = func(n, ind = "") {
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var name = n.getName();
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var name_attr = name;
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var children = [];
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foreach(var c; n.getChildren()) {
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var a = c.getName();
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if(substr(a, 0, size(prefix)) == prefix)
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name_attr ~= " " ~ substr(a, size(prefix)) ~ '="' ~ c.getValue() ~ '"';
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else
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append(children, c);
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}
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if(size(children)) {
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write(file, ind ~ "<" ~ name_attr ~ ">\n");
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foreach(var c; children)
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writenode(c, ind ~ indent);
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write(file, ind ~ "</" ~ name ~ ">\n");
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} elsif((var value = n.getValue()) != nil) {
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write(file, ind ~ "<" ~ name_attr ~ ">" ~ value ~ "</" ~ name ~ ">\n");
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} else {
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write(file, ind ~ "<" ~ name_attr ~ "/>\n");
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}
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}
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writenode(root[0]);
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close(file);
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if(size(root) != 1)
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die("writexml(): tree has more than one root node");
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}
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