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203 Zeilen
4.5 KiB
203 Zeilen
4.5 KiB
#include "crank.h"
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kstd::string_view crank_context::eval(kstd::string_view code)
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{
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auto ret = eval_no_copy(copy(code));
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return ret;
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}
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kstd::string_view identity(kstd::string_view args, crank_context& ctx)
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{
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return args;
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}
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kstd::string_view set(kstd::string_view args, crank_context& ctx)
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{
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args = skip_whitespace(args);
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auto key = extract_token(args);
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auto value = skip_linearspace(kstd::string_view(args.begin()+key.size(),args.end()));
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return ctx.store(key,value);
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}
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bool istokenok(int m)
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{
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return (
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isalpha(m)
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|| isdigit(m)
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|| m=='$'
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|| m=='-'
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|| m=='_'
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);
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}
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bool islinearspace(int m)
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{
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return (
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m==' '
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|| m=='\t'
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);
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}
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kstd::string_view skip_whitespace(kstd::string_view code)
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{
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auto m = code.begin();
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while(m<code.end() && isspace(*m))
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{
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m++;
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}
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return kstd::string_view(m,code.end());
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}
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kstd::string_view skip_linearspace(kstd::string_view code)
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{
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auto m = code.begin();
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while(m<code.end() && islinearspace(*m))
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{
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m++;
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}
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return kstd::string_view(m,code.end());
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}
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template<char bound>
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kstd::string_view extract_bounded(kstd::string_view code)
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{
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auto m = code.begin();
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while(m<code.end() && *m!=bound)
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{
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if(*m=='"')
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{
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m++;
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m+=extract_string(kstd::string_view(m,code.end())).size();
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m++;
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}
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else if(*m=='{')
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{
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m++;
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m+=extract_array(kstd::string_view(m,code.end())).size();
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m++;
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}
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else if(*m=='[')
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{
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m++;
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m+=extract_subcommand(kstd::string_view(m,code.end())).size();
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m++;
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}
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else if(istokenok(*m))
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{
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m+=extract_token(kstd::string_view(m,code.end())).size();
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}
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else
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{
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m = skip_whitespace(kstd::string_view(m,code.end())).begin();
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}
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}
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return kstd::string_view(code.begin(), m);
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}
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kstd::string_view extract_command(kstd::string_view code)
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{
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code = skip_whitespace(code);
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return extract_bounded<'\n'>(code);
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}
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kstd::string_view extract_subcommand(kstd::string_view code)
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{
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return extract_bounded<']'>(code);
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}
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kstd::string_view extract_string(kstd::string_view code)
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{
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auto m = code.begin();
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while(m<code.end() && *m!='"')
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{
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m+=(*m!='\\')?1:2;
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}
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return kstd::string_view(code.begin(), m);
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}
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kstd::string_view extract_token(kstd::string_view code)
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{
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auto m = code.begin();
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while(m<code.end() && istokenok(*m))
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{
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m++;
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}
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return kstd::string_view(code.begin(), m);
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}
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kstd::string_view extract_array(kstd::string_view code)
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{
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return extract_bounded<'}'>(code);
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}
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kstd::string_view crank_context::execute_command(kstd::string_view code)
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{
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code = copy_replace(code);
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auto token = extract_token(code);
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auto symbol = get_symbol(token);
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auto args = skip_linearspace(kstd::string_view(code.begin()+token.size(),code.end()));
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if(symbol.size())
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{
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if(symbol[0]=='@')
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{
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symbol = skip_linearspace(kstd::string_view(symbol.begin()+1, symbol.end()));
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while(istokenok(args[0]))
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{
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auto argname = extract_token(symbol);
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symbol = skip_linearspace(kstd::string_view(symbol.begin()+argname.size(), symbol.end()));
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auto argvalue = kstd::string_view();
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if(args[0]=='{')
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{
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argvalue=extract_array(kstd::string_view(args.begin()+1, args.end()));
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args = skip_linearspace(kstd::string_view(args.begin()+argvalue.size()+2, args.end()));
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}
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else if(args[0]=='[')
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{
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argvalue=crank_context::execute_command(extract_subcommand(kstd::string_view(args.begin()+1, args.end())));
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args = skip_linearspace(kstd::string_view(args.begin()+argvalue.size()+2, args.end()));
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}
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else if(args[0]=='"')
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{
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argvalue=extract_string(kstd::string_view(args.begin()+1, args.end()));
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args = skip_linearspace(kstd::string_view(args.begin()+argvalue.size()+2, args.end()));
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}
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else
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{
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argvalue=extract_token(kstd::string_view(args.begin()+1, args.end()));
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args = skip_linearspace(kstd::string_view(args.begin()+argvalue.size(), args.end()));
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}
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store(argname,argvalue);
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}
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symbol = extract_array(symbol);
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auto command = extract_command(symbol);
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auto ret = kstd::string_view();
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while(command.size())
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{
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ret = execute_command(command);
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symbol = kstd::string_view(symbol.begin()+command.size(),symbol.end());
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command = extract_command(symbol);
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}
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return ret;
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}
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else
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{
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return symbol;
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}
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}
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else
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{
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return get_native(token)(args,this);
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}
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}
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kstd::string_view crank_context::eval_no_copy(kstd::string_view code)
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{
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auto command = extract_command(code);
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auto ret = kstd::string_view();;
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while(command.size())
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{
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ret = execute_command(command);
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code = kstd::string_view(code.begin()+command.size(),code.end());
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command = extract_command(code);
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}
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return ret;
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}
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