core/interpreter.nim
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import streams, strutils, critbits, os, algorithm, logging import value, scope, parser type MinTrappedException* = ref object of CatchableError MinRuntimeError* = ref object of CatchableError data*: MinValue proc raiseRuntime*(msg: string, data: MinValue) {.extern:"min_exported_symbol_$1".}= data.objType = "error" raise MinRuntimeError(msg: msg, data: data) proc dump*(i: MinInterpreter): string {.extern:"min_exported_symbol_$1".}= var s = "" for item in i.stack: s = s & $item & " " return s proc debug*(i: In, value: MinValue) {.extern:"min_exported_symbol_$1".}= debug("(" & i.dump & $value & ")") proc debug*(i: In, value: string) {.extern:"min_exported_symbol_$1_2".}= debug(value) template withScope*(i: In, res:ref MinScope, body: untyped): untyped = let origScope = i.scope try: i.scope = newScopeRef(origScope) body res = i.scope finally: i.scope = origScope template withScope*(i: In, body: untyped): untyped = let origScope = i.scope try: i.scope = newScopeRef(origScope) body finally: i.scope = origScope template withDictScope*(i: In, s: ref MinScope, body: untyped): untyped = let origScope = i.scope try: i.scope = s body finally: i.scope = origScope proc newMinInterpreter*(filename = "input", pwd = ""): MinInterpreter {.extern:"min_exported_symbol_$1".}= var path = pwd if not pwd.isAbsolute: path = joinPath(getCurrentDir(), pwd) var stack:MinStack = newSeq[MinValue](0) var trace:MinStack = newSeq[MinValue](0) var stackcopy:MinStack = newSeq[MinValue](0) var pr:MinParser var scope = newScopeRef(nil) var i:MinInterpreter = MinInterpreter( filename: filename, pwd: path, parser: pr, stack: stack, trace: trace, stackcopy: stackcopy, scope: scope, currSym: MinValue(column: 1, line: 1, kind: minSymbol, symVal: "") ) return i proc copy*(i: MinInterpreter, filename: string): MinInterpreter {.extern:"min_exported_symbol_$1_2".}= var path = filename if not filename.isAbsolute: path = joinPath(getCurrentDir(), filename) result = newMinInterpreter() result.filename = filename result.pwd = path.parentDir result.stack = i.stack result.trace = i.trace result.stackcopy = i.stackcopy result.scope = i.scope result.currSym = MinValue(column: 1, line: 1, kind: minSymbol, symVal: "") proc formatError(sym: MinValue, message: string): string {.extern:"min_exported_symbol_$1".}= if sym.filename == "": return "[$1]: $2" % [sym.symVal, message] else: return "$1($2,$3) [$4]: $5" % [sym.filename, $sym.line, $sym.column, sym.symVal, message] proc formatTrace(sym: MinValue): string {.extern:"min_exported_symbol_$1".}= if sym.filename == "": return "<native> in symbol: $1" % [sym.symVal] else: return "$1($2,$3) in symbol: $4" % [sym.filename, $sym.line, $sym.column, sym.symVal] proc stackTrace(i: In) = var trace = i.trace trace.reverse() for sym in trace: notice sym.formatTrace proc error(i: In, message: string) = error(i.currSym.formatError(message)) proc open*(i: In, stream:Stream, filename: string) {.extern:"min_exported_symbol_$1_2".}= i.filename = filename i.parser.open(stream, filename) proc close*(i: In) {.extern:"min_exported_symbol_$1_2".}= i.parser.close(); proc push*(i: In, val: MinValue) {.gcsafe, extern:"min_exported_symbol_$1".} proc call*(i: In, q: var MinValue): MinValue {.gcsafe, extern:"min_exported_symbol_$1".}= var i2 = newMinInterpreter("<call>") i2.trace = i.trace i2.scope = i.scope try: i2.withScope(): for v in q.qVal: i2.push v except: i.currSym = i2.currSym i.trace = i2.trace raise return i2.stack.newVal proc callValue*(i: In, v: var MinValue): MinValue {.gcsafe, extern:"min_exported_symbol_$1".}= var i2 = newMinInterpreter("<call-value>") i2.trace = i.trace i2.scope = i.scope try: i2.withScope(): i2.push v except: i.currSym = i2.currSym i.trace = i2.trace raise return i2.stack[0] proc copyDict*(i: In, val: MinValue): MinValue {.gcsafe, extern:"min_exported_symbol_$1".}= # Assuming val is a dictionary var v = newDict(i.scope) for item in val.scope.symbols.pairs: v.scope.symbols[item.key] = item.val for item in val.scope.sigils.pairs: v.scope.sigils[item.key] = item.val if val.objType != "": v.objType = val.objType if not val.obj.isNil: v.obj = val.obj return v proc applyDict*(i: In, val: MinValue): MinValue {.gcsafe, extern:"min_exported_symbol_$1".}= # Assuming val is a dictionary var v = i.copyDict(val) for item in v.dVal.pairs: var value = item.val.val v.scope.symbols[item.key] = MinOperator(kind: minValOp, val: i.callValue(value), sealed: false) return v proc apply*(i: In, op: MinOperator) {.gcsafe, extern:"min_exported_symbol_$1".}= if op.kind == minProcOp: op.prc(i) else: if op.val.kind == minQuotation: var newscope = newScopeRef(i.scope) i.withScope(newscope): for e in op.val.qVal: i.push e else: i.push(op.val) proc dequote*(i: In, q: var MinValue) {.extern:"min_exported_symbol_$1".}= if q.kind == minQuotation: i.withScope(): let qqval = deepCopy(q.qVal) for v in q.qVal: i.push v q.qVal = qqval else: i.push(q) proc apply*(i: In, q: var MinValue) {.gcsafe, extern:"min_exported_symbol_$1_2".}= var i2 = newMinInterpreter("<apply>") i2.trace = i.trace i2.scope = i.scope try: i2.withScope(): for v in q.qVal: if (v.kind == minQuotation): var v2 = v i2.dequote(v2) else: i2.push v except: i.currSym = i2.currSym i.trace = i2.trace raise i.push i2.stack.newVal proc push*(i: In, val: MinValue) {.gcsafe, extern:"min_exported_symbol_$1".}= if val.kind == minSymbol: i.debug(val) i.trace.add val if not i.evaluating: i.currSym = val let symbol = val.symVal if i.scope.hasSymbol(symbol): i.apply i.scope.getSymbol(symbol) else: let sigil = "" & symbol[0] if symbol.len > 1 and i.scope.hasSigil(sigil): i.stack.add(MinValue(kind: minString, strVal: symbol[1..symbol.len-1])) i.apply(i.scope.getSigil(sigil)) else: raiseUndefined("Undefined symbol '$1'" % [val.symVal]) discard i.trace.pop elif val.kind == minDictionary and val.objType != "module": # Dictionary must be copied every time they are interpreted, otherwise when they are used in cycles they reference each other. var v = i.copyDict(val) i.stack.add(v) else: i.stack.add(val) proc pop*(i: In): MinValue {.extern:"min_exported_symbol_$1".}= if i.stack.len > 0: return i.stack.pop else: raiseEmptyStack() proc peek*(i: MinInterpreter): MinValue {.extern:"min_exported_symbol_$1".}= if i.stack.len > 0: return i.stack[i.stack.len-1] else: raiseEmptyStack() proc interpret*(i: In, parseOnly=false): MinValue {.discardable, extern:"min_exported_symbol_$1".} = var val: MinValue var q: MinValue if parseOnly: q = newSeq[MinValue](0).newVal while i.parser.token != tkEof: if i.trace.len == 0: i.stackcopy = i.stack try: val = i.parser.parseMinValue(i) if parseOnly: q.qVal.add val else: i.push val except MinRuntimeError: let msg = getCurrentExceptionMsg() i.stack = i.stackcopy error("$1:$2,$3 $4" % [i.currSym.filename, $i.currSym.line, $i.currSym.column, msg]) i.stackTrace i.trace = @[] raise MinTrappedException(msg: msg) except MinTrappedException: raise except: let msg = getCurrentExceptionMsg() i.stack = i.stackcopy i.error(msg) i.stackTrace i.trace = @[] raise MinTrappedException(msg: msg) if parseOnly: return q if i.stack.len > 0: return i.stack[i.stack.len - 1] proc eval*(i: In, s: string, name="<eval>", parseOnly=false): MinValue {.discardable, extern:"min_exported_symbol_$1".}= var i2 = i.copy(name) i2.open(newStringStream(s), name) discard i2.parser.getToken() result = i2.interpret(parseOnly) i.trace = i2.trace i.stackcopy = i2.stackcopy i.stack = i2.stack i.scope = i2.scope proc load*(i: In, s: string, parseOnly=false): MinValue {.discardable, extern:"min_exported_symbol_$1".}= var fileLines = newSeq[string](0) var contents = "" try: fileLines = s.readFile().splitLines() except: fatal("Cannot read from file: " & s) if fileLines[0].len >= 2 and fileLines[0][0..1] == "#!": contents = fileLines[1..fileLines.len-1].join("\n") else: contents = fileLines.join("\n") var i2 = i.copy(s) i2.open(newStringStream(contents), s) discard i2.parser.getToken() result = i2.interpret(parseOnly) i.trace = i2.trace i.stackcopy = i2.stackcopy i.stack = i2.stack i.scope = i2.scope proc parse*(i: In, s: string, name="<parse>"): MinValue {.extern:"min_exported_symbol_$1".}= return i.eval(s, name, true) proc read*(i: In, s: string): MinValue {.extern:"min_exported_symbol_$1".}= return i.load(s, true) |