add methods needed for solidity code navigation

remix-debug/src/cmdline/index.js

@@ -81,9 +81,18 @@ class CmdLine {
     return source
   }
 
+  getCurrentLine() {
+    let lineColumnPos = this.lineColumnPos
+    if (!lineColumnPos) return ""
+    let currentLineNumber = lineColumnPos.start.line
+    let content = this.compilation.lastCompilationResult.source.sources[this.filename].content.split("\n")
+    return content[currentLineNumber]
+  }
+
   startDebug(txNumber, filename, cb) {
     const self = this
     this.filename = filename
+    this.txHash = txNumber
     this.debugger.debug(null, txNumber, null, () => {
 
       self.debugger.event.register('newSourceLocation', function (lineColumnPos, rawLocation) {
@@ -111,6 +120,13 @@ class CmdLine {
     })
   }
 
+  getVars() {
+    return {
+      locals: this.solidityLocals,
+      contract: this.solidityState
+    }
+  }
+
   triggerSourceUpdate() {
     this.events.emit("source", [this.lineColumnPos, this.rawLocation])
   }
@@ -144,13 +160,43 @@ class CmdLine {
   }
 
   getTraceLength() {
+    if (!this.debugger.step_manager) return 0;
     return this.debugger.step_manager.traceLength
   }
 
+  getCodeFirstStep() {
+    if (!this.debugger.step_manager) return 0;
+    return this.debugger.step_manager.calculateFirstStep()
+  }
+
+  getCodeTraceLength() {
+    if (!this.debugger.step_manager) return 0;
+    return this.debugger.step_manager.calculateCodeLength()
+  }
+
+  nextStep() {
+    if (!this.debugger.step_manager) return 0;
+    return this.debugger.step_manager.nextStep()
+  }
+
+  previousStep() {
+    if (!this.debugger.step_manager) return 0;
+    return this.debugger.step_manager.previousStep()
+  }
+
   currentStep() {
+    if (!this.debugger.step_manager) return 0;
     return this.debugger.step_manager.currentStepIndex
   }
 
+  canGoNext() {
+    return this.currentStep() < this.getCodeTraceLength()
+  }
+
+  canGoPrevious() {
+    return this.currentStep() > this.getCodeFirstStep()
+  }
+
   unload() {
     return this.debugger.unload()
   }

remix-debug/src/debugger/stepManager.js

@@ -10,6 +10,7 @@ class DebuggerStepManager {
     this.traceManager = traceManager
     this.currentStepIndex = 0
     this.traceLength = 0
+    this.codeTraceLength = 0
     this.revertionPoint = null
 
     this.listenToEvents()
@@ -26,6 +27,7 @@ class DebuggerStepManager {
         if (self.traceLength !== newLength) {
           self.event.trigger('traceLengthChanged', [newLength])
           self.traceLength = newLength
+          self.codeTraceLength = self.calculateCodeLength()
         }
         self.jumpTo(0)
       })
@@ -156,6 +158,37 @@ class DebuggerStepManager {
     this.debugger.breakpointManager.jumpPreviousBreakpoint(this.currentStepIndex, true)
   }
 
+  calculateFirstStep() {
+    let step = this.resolveToReducedTrace(0, 1)
+    return this.resolveToReducedTrace(step, 1)
+  }
+
+  calculateCodeStepList() {
+    let step = 0
+    let steps = []
+    while (step < this.traceLength) {
+      let _step = this.resolveToReducedTrace(step, 1)
+      if (!_step) break;
+      steps.push(_step)
+      step += 1
+    }
+    steps = steps.filter((item, pos, self) => { return steps.indexOf(item) === pos })
+    return steps
+  }
+
+  calculateCodeLength() {
+    let steps = this.calculateCodeStepList().reverse()
+    return this.calculateCodeStepList().reverse()[1] || this.traceLength;
+  }
+
+  nextStep() {
+    return this.resolveToReducedTrace(this.currentStepIndex, 1);
+  }
+
+  previousStep() {
+    return this.resolveToReducedTrace(this.currentStepIndex, -1);
+  }
+
   resolveToReducedTrace (value, incr) {
     if (this.debugger.callTree.reducedTrace.length) {
       var nextSource = util.findClosestIndex(value, this.debugger.callTree.reducedTrace)