Mercurial > repos > tabletprog
annotate tpi.js @ 246:8c81afd6d2d3
Refactor some of the AST node object constructors into a separate AST module
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 06 Jan 2014 19:41:35 -0800 |
parents | 60eff5f81d9a |
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rev | line source |
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Implemented a simple interpreter to be used for macro expansion and a driver for testing it
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1 var module = {exports: {}}; |
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2 var console = {log: function(text){}}; |
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3 var PEG; |
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4 |
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5 var file = null; |
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6 var argtype = 'normal'; |
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7 var includes = ['.']; |
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8 var basedir = ''; |
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9 var debugmode = false; |
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10 for (var i = 0; i < arguments.length; i++) { |
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11 switch (argtype) { |
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12 case 'normal': |
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13 switch (arguments[i]) { |
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14 case '-basedir': |
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15 case '-i': |
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16 case '-interpdebug': |
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17 debugmode = true; |
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18 break; |
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19 default: |
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20 if (arguments[i].charAt(0) == '-') { |
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21 print("unrecognized switch", arguments[i]); |
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22 quit(1); |
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23 } |
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24 file = arguments[i]; |
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25 } |
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26 break; |
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27 case '-basedir': |
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28 if (basedir == '') { |
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29 basedir = arguments[i]; |
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30 argtype = 'normal'; |
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31 } else { |
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32 print("only one -basedir option allowed"); |
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33 quit(1); |
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34 } |
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35 break; |
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36 case '-i': |
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37 includes.push(arguments[i]); |
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38 argtype = 'normal'; |
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39 break; |
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40 case '-backend': |
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41 backend = arguments[i]; |
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42 argtype = 'normal'; |
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43 break; |
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44 } |
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45 } |
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46 if (argtype != 'normal') { |
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47 print("switch", argtype, "expects a parameter"); |
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48 quit(1); |
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49 } |
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50 |
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51 if (!file) { |
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52 print('usage: d8 tpi.js -- filename'); |
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53 quit(1); |
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54 } |
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55 includes.push(basedir + 'modules'); |
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56 interpFile(file, basedir, includes, debugmode); |
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57 |
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58 |
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59 function parseFile(filename) |
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60 { |
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61 debugprint('//parsing', filename); |
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62 var text = read(filename); |
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63 try { |
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64 var parsed = parser.parse(text); |
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65 } catch (error) { |
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66 print('SyntaxError on at', error.line, ',', error.column, ':', error.message); |
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67 var lines = text.split('\n'); |
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68 print(lines[error.line-1]); |
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69 var spacer = ''; |
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70 for (var i = 1; i < error.column; i++) { |
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71 if (lines[error.line-1].charAt(i-1) == '\t') { |
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72 spacer += ' '; |
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73 } else { |
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74 spacer += ' '; |
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75 } |
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76 } |
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77 print(spacer + '^'); |
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78 quit(1); |
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79 } |
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80 return parsed; |
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81 } |
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82 |
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83 |
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84 function interpFile(filename, basedir, includes, debugmode) |
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85 { |
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86 load(basedir + 'mquery.js'); |
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87 load(basedir + 'peg.js'); |
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88 PEG = module.exports; |
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89 load(basedir + 'parser.js'); |
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90 load(basedir + 'interp.js'); |
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91 |
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92 if (debugmode) { |
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93 debugprint = print; |
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94 } else { |
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95 debugprint = function() {}; |
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96 } |
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97 var parsed = parseFile(filename); |
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98 |
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99 toplevel = new topenv(includes); |
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100 |
207
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101 parsed = parsed.macroexpand(toplevel); |
206
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102 var mainModule = parsed.eval(toplevel); |
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103 return mainModule.tpmeth_main(); |
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104 } |