mirror of https://github.com/japl-lang/japl.git
130 lines
4.0 KiB
Nim
130 lines
4.0 KiB
Nim
# Copyright 2020 Mattia Giambirtone
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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## Main entry point for the JAPL language
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import strformat
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import parseopt
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import os
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import config
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import vm
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import stdlib
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proc repl() =
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var bytecodeVM = initVM()
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bytecodeVM.stdlibInit()
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echo JAPL_VERSION_STRING
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echo &"[Nim {NimVersion} on {hostOs} ({hostCPU})]"
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when DEBUG_TRACE_VM:
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echo "Debugger enabled, expect verbose output\n"
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echo "==== Runtime Constants ====\n"
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echo &"- FRAMES_MAX -> {FRAMES_MAX}"
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echo "==== Debugger started ====\n"
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var source: string = ""
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while true:
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try:
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stdout.write("=> ")
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source = readLine(stdin)
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except IOError:
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echo ""
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bytecodeVM.freeVM()
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break
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except KeyboardInterrupt:
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echo ""
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bytecodeVM.freeVM()
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break
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if source == "//clear" or source == "// clear":
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echo "\x1Bc"
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echo JAPL_VERSION_STRING
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echo &"[Nim {NimVersion} on {hostOs} ({hostCPU})]"
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continue
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elif source != "":
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var result = bytecodeVM.interpret(source, true, "stdin")
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when DEBUG_TRACE_VM:
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echo &"Result: {result}"
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when DEBUG_TRACE_VM:
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echo "==== Debugger exits ===="
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proc main(file: string = "") =
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if file == "":
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repl()
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else:
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var sourceFile: File
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try:
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sourceFile = open(filename=file)
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except IOError:
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echo &"Error: '{file}' could not be opened, probably the file doesn't exist or you don't have permission to read it"
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return
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var source: string
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try:
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source = readAll(sourceFile)
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except IOError:
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echo &"Error: '{file}' could not be read, probably you don't have the permission to read it"
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var bytecodeVM = initVM()
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bytecodeVM.stdlibInit()
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when DEBUG_TRACE_VM:
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echo "Debugger enabled, expect verbose output\n"
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echo "==== VM Constants ====\n"
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echo &"- FRAMES_MAX -> {FRAMES_MAX}"
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echo "==== Code starts ====\n"
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var result = bytecodeVM.interpret(source, false, file)
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bytecodeVM.freeVM()
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when DEBUG_TRACE_VM:
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echo &"Result: {result}"
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when DEBUG_TRACE_VM:
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echo "==== Code ends ===="
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when isMainModule:
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var optParser = initOptParser(commandLineParams())
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var file: string = ""
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if paramCount() > 0:
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if paramCount() notin 1..<2:
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echo "usage: japl [filename]"
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quit()
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for kind, key, value in optParser.getopt():
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case kind:
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of cmdArgument:
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file = key
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of cmdLongOption:
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case key:
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of "help":
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echo HELP_MESSAGE
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quit()
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of "version":
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echo JAPL_VERSION_STRING
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quit()
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else:
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echo &"error: unkown option '{key}'"
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quit()
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of cmdShortOption:
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case key:
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of "h":
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echo HELP_MESSAGE
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quit()
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of "v":
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echo JAPL_VERSION_STRING
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quit()
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else:
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echo &"error: unkown option '{key}'"
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quit()
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else:
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echo "usage: japl [filename]"
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quit()
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main(file)
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