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114 lines
3.8 KiB
114 lines
3.8 KiB
#include <stdio.h>
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#include <iostream>
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#include <vector>
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#include <map>
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#include "util.h"
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// These appear as independent tokens even if inside a stream of symbols
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const std::string atoms[] = { "#", "//", "(", ")", "[", "]", "{", "}" };
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const int numAtoms = 8;
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// Is the char alphanumeric, a space, a bracket, a quote, a symbol?
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int chartype(char c) {
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if (c >= '0' && c <= '9') return ALPHANUM;
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else if (c >= 'a' && c <= 'z') return ALPHANUM;
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else if (c >= 'A' && c <= 'Z') return ALPHANUM;
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else if (std::string("~._$").find(c) != std::string::npos) return ALPHANUM;
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else if (c == '\t' || c == ' ' || c == '\n') return SPACE;
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else if (std::string("()[]{}").find(c) != std::string::npos) return BRACK;
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else if (c == '"') return DQUOTE;
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else if (c == '\'') return SQUOTE;
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else return SYMB;
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}
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// "y = f(45,124)/3" -> [ "y", "f", "(", "45", ",", "124", ")", "/", "3"]
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std::vector<Node> tokenize(std::string inp, Metadata metadata, bool lispMode) {
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int curtype = SPACE;
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unsigned pos = 0;
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int lastNewline = 0;
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metadata.ch = 0;
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std::string cur;
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std::vector<Node> out;
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inp += " ";
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while (pos < inp.length()) {
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int headtype = chartype(inp[pos]);
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if (lispMode) {
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if (inp[pos] == '\'') headtype = ALPHANUM;
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}
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// Are we inside a quote?
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if (curtype == SQUOTE || curtype == DQUOTE) {
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// Close quote
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if (headtype == curtype) {
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cur += inp[pos];
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out.push_back(token(cur, metadata));
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cur = "";
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metadata.ch = pos - lastNewline;
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curtype = SPACE;
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pos += 1;
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}
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// eg. \xc3
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else if (inp.length() >= pos + 4 && inp.substr(pos, 2) == "\\x") {
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cur += (std::string("0123456789abcdef").find(inp[pos+2]) * 16
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+ std::string("0123456789abcdef").find(inp[pos+3]));
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pos += 4;
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}
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// Newline
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else if (inp.substr(pos, 2) == "\\n") {
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cur += '\n';
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pos += 2;
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}
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// Backslash escape
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else if (inp.length() >= pos + 2 && inp[pos] == '\\') {
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cur += inp[pos + 1];
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pos += 2;
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}
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// Normal character
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else {
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cur += inp[pos];
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pos += 1;
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}
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}
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else {
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// Handle atoms ( '//', '#', brackets )
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for (int i = 0; i < numAtoms; i++) {
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int split = cur.length() - atoms[i].length();
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if (split >= 0 && cur.substr(split) == atoms[i]) {
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if (split > 0) {
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out.push_back(token(cur.substr(0, split), metadata));
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}
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metadata.ch += split;
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out.push_back(token(cur.substr(split), metadata));
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metadata.ch = pos - lastNewline;
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cur = "";
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curtype = SPACE;
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}
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}
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// Special case the minus sign
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if (cur.length() > 1 && cur[cur.length() - 1] == '-') {
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out.push_back(token(cur.substr(0, cur.length() - 1), metadata));
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out.push_back(token("-", metadata));
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cur = "";
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}
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// Boundary between different char types
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if (headtype != curtype) {
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if (curtype != SPACE && cur != "") {
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out.push_back(token(cur, metadata));
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}
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metadata.ch = pos - lastNewline;
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cur = "";
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}
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cur += inp[pos];
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curtype = headtype;
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pos += 1;
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}
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if (inp[pos] == '\n') {
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lastNewline = pos;
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metadata.ch = 0;
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metadata.ln += 1;
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}
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}
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return out;
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}
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