| [6] | 1 | #include <vrmllib/node.h> |
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| 2 | |
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| 3 | #include <iostream> |
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| 4 | #include <stdexcept> |
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| 5 | |
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| 6 | #include <vrmllib/file.h> |
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| 7 | |
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| 8 | namespace vrmllib { |
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| 9 | namespace bits { |
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| 10 | |
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| 11 | void parse_value(node *&n, std::istream &s, file &data) |
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| 12 | { |
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| 13 | std::string word; |
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| 14 | s >> word; |
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| 15 | if (!s) |
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| 16 | throw std::runtime_error("parse error: end of file wile reading node"); |
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| 17 | n = node::parse_node_xdef(s, data, word); |
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| 18 | } |
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| 19 | |
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| 20 | } // namespace bits |
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| 21 | |
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| 22 | node::~node() |
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| 23 | { |
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| 24 | } |
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| 25 | |
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| 26 | void node::parse_attribute(const std::string &name, std::istream &s, file &data) |
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| 27 | { |
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| 28 | std::cerr << "unknown attribute: " << name << std::endl; |
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| 29 | std::string val; |
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| 30 | s >> val; |
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| 31 | if (!s) |
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| 32 | throw std::runtime_error("parse error: end of file while reading unknown attribute"); |
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| 33 | if (val == "[") { |
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| 34 | char c = 0; |
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| 35 | int depth = 1; |
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| 36 | s >> c; |
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| 37 | while (depth != 0) { |
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| 38 | if (!(s >> c)) |
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| 39 | throw std::runtime_error("parse error: end of file while scanning for end of unknown attribute"); |
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| 40 | if (c == '[') |
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| 41 | ++depth; |
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| 42 | else if (c == ']') |
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| 43 | --depth; |
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| 44 | } |
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| 45 | } else if (val == "TRUE" || val == "FALSE" || val[0] == '-' || isdigit(val[0])) { |
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| 46 | char c; |
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| 47 | while (s.get(c) && c != '\n' && c != '\r') |
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| 48 | ; |
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| 49 | if (!s) |
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| 50 | throw std::runtime_error("parse error: end of file while scanning for end of line"); |
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| 51 | } else { |
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| 52 | parse_node_xdef(s, data, val); |
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| 53 | } |
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| 54 | } |
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| 55 | |
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| 56 | node *node::parse_node(std::istream &s, file &data, |
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| 57 | const std::string &type) |
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| 58 | { |
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| 59 | node *n = create_node(type); |
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| 60 | if (!n) { |
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| 61 | char c = 0; |
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| 62 | int depth = 1; |
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| 63 | s >> c; |
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| 64 | if (c != '{') |
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| 65 | throw std::runtime_error( |
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| 66 | std::string("parse error: expected {, got: ") + c); |
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| 67 | while (depth != 0) { |
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| 68 | if (!(s >> c)) |
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| 69 | throw std::runtime_error("parse error: end of file while scanning for end of unknown node"); |
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| 70 | if (c == '{') |
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| 71 | ++depth; |
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| 72 | else if (c == '}') |
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| 73 | --depth; |
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| 74 | } |
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| 75 | return 0; |
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| 76 | } |
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| 77 | data.nodes.push_back(n); |
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| 78 | |
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| 79 | char c; |
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| 80 | s >> c; |
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| 81 | if (c != '{') |
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| 82 | throw std::runtime_error( |
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| 83 | std::string("parse error: expected {, got: ") + c); |
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| 84 | |
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| 85 | std::string str; |
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| 86 | for (;;) { |
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| 87 | s >> c; |
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| 88 | if (c == '}') |
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| 89 | break; |
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| 90 | else |
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| 91 | s.putback(c); |
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| 92 | |
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| 93 | s >> str; |
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| 94 | n->parse_attribute(str, s, data); |
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| 95 | } |
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| 96 | |
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| 97 | return n; |
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| 98 | } |
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| 99 | |
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| 100 | node *node::parse_node_xdef(std::istream &s, file &data, const std::string &fword) |
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| 101 | { |
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| 102 | if (fword == "DEF") { |
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| 103 | std::string word; |
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| 104 | s >> word; |
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| 105 | std::string name = word; |
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| 106 | s >> word; |
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| 107 | node *n = parse_node(s, data, word); |
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| 108 | node *&dest = data.defs[name]; |
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| 109 | if (dest) |
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| 110 | throw std::runtime_error( |
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| 111 | "parse error: node already defined: " + name); |
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| 112 | return dest = n; |
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| 113 | } else if (fword == "USE") { |
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| 114 | std::string word; |
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| 115 | s >> word; |
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| 116 | if (node *n = data.defs[word]) |
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| 117 | return n; |
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| 118 | else |
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| 119 | throw std::runtime_error( |
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| 120 | "parse error: node is not defined: " + word); |
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| 121 | } else |
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| 122 | return parse_node(s, data, fword); |
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| 123 | } |
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| 124 | |
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| 125 | } // namespace vrmllib |
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